Abstract: A surgical drill for drilling a hole in a workpiece includes a housing, a probe moveably mounted to the housing, and a transducer assembly. The transducer assembly includes a gear coupled to the probe and at least two rotational sensor devices coupled to the gear to determine an amount of movement of a probe relative to a housing to determine a bore depth of the hole. The gear has a reference point having an angular path of rotation about a gear axis subdivided into separate first and second arcuate regions. A first sensor device is configured to detect a rotational position of the reference point in the first arcuate region, and a second sensor device is configured to detect a rotational position of the reference point in at least the second arcuate region, with the first sensor device incapable of detecting the reference point in the second arcuate region.

Abstract: Various systems and methods are provided that display various graphs in an interactive user interface in substantially real-time in response to input from a user in order to determine information related to measured data points and provide the determined information to the user in the interactive user interface. For example, a computing device may be configured to retrieve data from one or more databases and generate one or more interactive user interfaces. The one or more interactive user interfaces may display the retrieved data in one or more graphs, such as time-series or scatterplots. The user interface may be interactive in that a user may manipulate one graph, which causes an identical or nearly identical manipulation of another displayed graph in real-time. The manipulations may occur even if the displayed graphs include data across different time ranges.

Abstract: An apparatus and method for planning a drilling sequence. The solution relates also to a rock drilling rig and to a computer program product. The apparatus searches several possible drilling scenarios for drilling a given drilling pattern. Different actions required by the scenarios have given costs and the executed algorithm calculates total costs of found scenarios. Scenarios with the lowest costs are selected.

Abstract: In the general context of oilfield equipment and, in particular, in the context of downhole tools, the systems and methods relate to characterizing flow in a wellbore using data collection devices, which may be temporarily attached on the outside of a work string to be run into the wellbore. More particularly, the systems and methods may be used for obtaining flow data at a plurality of different locations and correlated with wellbore depth for evaluation of production profiles of wellbores. A system may be provided that comprises a work string, multiple external support devices temporarily secured to an exterior of the work string at a plurality of different locations, and at least one data collection device such as a resistivity gauge, flow meter, and/or Doppler sensor, coupled to the external support devices. This data, once recovered on surface, could be incorporated into an overall production profile model of the well.

Abstract: A method and system for visualizing data to detect a collar. A method may comprise disposing an electromagnetic logging tool downhole; emitting an electromagnetic field from the transmitter; energizing a casing with the electromagnetic field to produce an eddy current; recording the eddy current from the casing with the receiver; creating a variable-density-log from the recorded eddy current; selecting a wrapping period for the variable-density-log; creating a wrapped-variable-density-log from the variable-density-log using the wrapping period; and determining at least one collar location and a pipe index with the wrapped-variable-density-log. A system for to detect a collar may comprise an electromagnetic logging tool. The electromagnetic logging tool may comprise a transmitter and a receiver, wherein the transmitter and the receiver may be a coil. The system may further comprise an information handling system.

Abstract: A rotary valve can include a housing, a manifold with multiple flow paths can be fixedly mounted to the housing. A rotary actuator with a first surface can be rotatably mounted within the housing, and a valve seat with a second surface can be fixedly attached to the manifold, where the second surface can sealingly engage the first surface. The rotary actuator can include a gap that selectively aligns with respective ones of valve seat ports as the rotary actuator rotates relative to the valve seat, thereby selectively pressurizing one or more actuators. A system and method can include a rotary valve that selectively causes pads to extend at a predetermined orientation in the wellbore to steer a drill bit. The azimuthal orientation of a rotary actuator of the valve can determine which pads are extended and which are retracted as the drill bit rotates.

Abstract: Multi-directional drilling of a bone to create a perforation of bone cortex. The disclosure presents methods of using a drill having a measurement system to advance a drill bit through a bone with detection of penetration or eruption of the leading edge of the drill bit through the exterior of the cortex layer of the bone. In this regard, operation of the drill may be controlled to limit soft tissue damage adjacent to the distal side of the bone. The drill bit may be at least partially retracted through a first bore, repositioned, and one or more additional bores may be created, all while monitoring for penetration of the leading edge of the drill bit relative to the cortical layer. In turn, a perforated distal side of the cortical layer of the bone may be created that creates a desired weakness in the bone, which may be useful in various operations including when performing a corticotomy or the like.

Abstract: A method of controlling a pumping sequence of a fracturing fleet at a wellsite. A managing application executing on a computer in the control van can retrieve the pumping sequence from a local or remote storage computer. The managing application can establish an electronic communication link to receive sensor data from a plurality of fracturing units. The managing application can control the plurality of fracturing units with a stage script with multiple sequential instructions for a pumping stage of a pumping sequence while receiving one or more periodic data sets from the plurality of fracturing units wherein the data sets are indicative of the current state of the pumping stage of the pumping sequence.

Abstract: A bottom hole assembly (BHA) operable to be conveyed within a wellbore extending into a subterranean formation from a wellsite surface via coiled tubing. The BHA may operable to receive a fluid pumped from the wellsite surface via the coiled tubing. The BHA may include a fluid control tool comprising a first fluid passage extending longitudinally through the fluid control tool and a plurality of first fluid outlets extending radially between the first fluid passage and the wellbore. The fluid control tool may be selectively operable to close the first fluid passage and open the plurality of first fluid outlets to pass the fluid into the wellbore via the plurality of first fluid outlets, and close the plurality of first fluid outlets and open the first fluid passage to pass the fluid through first fluid passage. The BHA may further include a tractor operable to move the BHA along the wellbore coupled downhole from the fluid control tool.

Abstract: A penetration-type monitor includes a casing pipe and sensor penetration scissors, the sensor penetration scissors are arranged in a shear shape, and a first blade and a second blade rotate close to each other or away from each other in the vertical direction so as to define an initial position and a monitoring position of the sensor penetration scissors; when the sensor penetration scissors are located at the initial position, ends of pressed portions of the first blade and the second blade are arranged at an interval one above the other, when the sensor penetration scissors are located at the monitoring position, the pressed portions move close to each other, and shearing portions penetrate out of a mounting hole to shear a sliding mass; and a monitor arrangement system drives the sensor penetration scissors to move from the initial position to the monitoring position.

Abstract: A system for tracking a below-ground transmitter from an aerial receiver. The receiver has an antenna assembly, a processor, and a propulsion system. The antenna assembly detects the magnetic field from an underground transmitter and generates an antenna signal. The processor is programmed to receive the antenna signal and generate a command signal, which moves the receiver to a position above the transmitter. Once in the desired position, which may be a reference plane at a fixed elevation, the antenna assembly measures the magnetic field to determine the location of the drill bit along borepath.

Abstract: Systems, devices, and methods for producing a three-dimensional visualization of one or more of a drilled wellbore, a bottom hole assembly, a drill bit, a drill plan, and one or more lithology windows is provided for drill steering purposes. A drilling motor with a toolface in communication with a sensor system is provided. A controller in communication with the sensor system is operable to generate a depiction of the drill plan, a depiction of the drilling motor, and one or more lithology windows, and to combine these depictions in a three-dimensional visualization of the down hole environment. This visualization may be used by an operator to steer the drilled wellbore.

Abstract: An apparatus, method, and system for multi-well ranging and planning of a second injector well in the presence of a first injector well in close proximity to a producer well. The method includes generating a three-well forward simulation model using survey data for a producer well, survey data for a first injector well, survey data for a first section of a second injector well, a producer well casing property profile, and a formation resistivity parameter. The method provides for determining the offset between the true magnetic sensor position in the BHA and a planned depth position. The method determines ranging distance and direction of the drilling well to target well using the offset between the true magnetic sensor position and the first planned depth position. The method helps to adjust directional drilling parameter to achieve constant ranging distance between drilling well and target well.

Abstract: Systems and methods of optimizing a new well path using a minimum curvature method are disclosed. An arc of the new well path may include a change in curvature at a point along the length of the arc. The arc of the new well path may be determined by iteratively: selecting a length of a first arc portion of the arc; determining a length of a second arc portion of the arc according to a minimum curvature method; combining the first arc portion and the second arc portion to form an arc; determining a deviation of the arc relative to a planned well trajectory; and selecting the arc with the lowest deviation from the planned well trajectory.

Abstract: A compact open-path horizontal trenchless pipe ramming device for short distance horizontal drilling and which accommodates off-the-shelf standard plastic or steel pipe stems in a range of pipe diameters. The device is lightweight and competent to retrieve a drill string and attached cable or replacement pipe.

Abstract: A method of modeling a wellbore path in an earth model, including receiving, from an electronic drilling recorder coupled to a bottom hole assembly (BHA), a set of BHA data, and a set of operating parameters data and receiving, a set of rock formation data; generating, a representation of a wellbore path in a first section of the earth model, by assessing the set of BHA data, the set of operating parameters data, the set of rock formation data, and a first set of parameters quantifying bit steerability, walk, coefficient of friction, and overgauge borehole information. The method includes modifying, based on data received from a survey corresponding to the first section of the earth model, the first set of parameters to generate a second set of parameters, and generating a future wellbore path in a second section of the earth model by applying the second set of parameters.

Abstract: Some methods of determining a tubing and casing annulus fluid leak of a well include receiving pressure information and depth information from three or more pressure sensors in fluid communication with a fluid of the tubing casing annulus. Some methods include receiving at least three baseline pressure gradients and determining at least three current pressure gradients based on the pressure information and depth information of the three or more pressure sensors. Some methods include determining pressure differences between the at least three baseline pressure gradients and the at least three current pressure gradients. Some methods include determining whether any of the pressure differences are above a pressure threshold, and responsive to determining that at least one of the pressure differences is above the pressure threshold, determining a fluid level of the fluid within the tubing casing annulus based on the pressure differences.

Abstract: Conventional practice for determining a life expectancy of a drilling tool has been based on simple static bending moment evaluation and/or conservative past experience life limits. This archaic practice has often led to premature scrapping of the tools and has proven to be overly conservative and cost-ineffective. Introduced herein is a BHA condition monitoring technique that combines both field data and advanced models in one system. The introduced technique is based on a combination of system and component level models to monitor and evaluate the current health and life of BHA components. The introduced technique can apply to all directional drilling BHAs, including mud motors and rotary steerable systems, and can be used at different levels of the tool's life cycle to improve efficiency, reduce downhole failure incidents, and maximize assets' utilization.

Abstract: A method for flowing a fluid from and/or to a subsurface formation includes disposing a main production tubular in a main borehole penetrating the subsurface formation, the main production tubular being coupled to a shunt assembly, the shunt assembly defining an opening oriented and biased in a desired direction for a lateral borehole penetrating the subsurface formation and having a shunt tube that bypasses the opening. The method also includes drilling the lateral borehole through the opening in the shunt assembly and installing a completion having a lateral production tubular coupled to a completion device in the lateral borehole through the opening. The method further incudes flowing the fluid from the subsurface formation to the shunt tube and/or from the shunt tube to the subsurface formation.

Abstract: A method and system for detecting a conductive member in a formation. The method may comprise disposing an electromagnetic induction tool into a wellbore, transmitting the electromagnetic field from the at least one electromagnetic source, energizing the conductive member in a second wellbore, wherein an eddy current is induced in the conductive member, transmitting a second electromagnetic field from the conductive member, wherein the second electromagnetic field is formed by the eddy current, sensing the second electromagnetic field with the receiver, recording an amplitude of the second electromagnetic field as data, and transmitting the data to an information handling system. A system for detecting a conductive member in a formation may comprise an electromagnetic induction tool. The electromagnetic induction tool may comprise at least one electromagnetic source and at least one receiver. The system may further comprise an information handling system.

Abstract: A washpipe seal and method includes providing a first sliding mechanical face seal between two seal elements to seal a mud conduit, and a second mechanical face seal between two additional seal elements to define a cavity within a housing of the washpipe between the first and second mechanical face seals and independently from the mud conduit, and in which, during operation, a buffer fluid can be provided.

Abstract: Methods of monitoring for influx and/or loss events in a wellbore are disclosed. One method comprises: receiving a measurement relating to fluid entering or leaving the wellbore, wherein the measurement is selected from flow out rate and active volume; and comparing the measurement with an expected value for the measurement to provide a deviated measurement value. The method further comprises receiving a pump pressure value of a pump associated with the wellbore; and comparing the pump pressure value with an expected pump pressure value to provide a deviated pump pressure value. It is then established whether an influx event and/or it is established whether a loss event may have occurred based on at least the deviated measurement value and deviated pump pressure value. Systems configured to monitor for influx and/or loss events in a wellbore are also disclosed.

Abstract: A smart entry point spatial security system is intended for securing facility and other entrances in general. The system includes a device associated to an entry point. The device can be coupled externally to the entry point or natively as built-in to the entry point structure or any entry point subcomponents, such as knobs and locks. A host device with a software application monitors or observes the entry point sensor data via wired or wireless link such as Bluetooth. The sensor includes a software algorithm that is adapted to trigger safety alarms upon unauthorized usage of the entry point or as means of regulating entrance of users to a dedicated general space. The sensor data is stored locally on a host computer and a logging system is available on cloud computing device. The stored data will be used in further optimizing spatial data.

Abstract: According to aspects of the present disclosure, systems and methods for a closed-loop speed/position control mechanism. An example system may include a housing and a planetary gearbox disposed within the housing, wherein a ring gear of the planetary gearbox is coupled to the housing, a sun gear of the planetary gearbox is coupled to a drive shaft, and a planetary carrier of the planetary gearbox is coupled to an output shaft. A controller may receive measurements from sensors proximate to the output shaft and use those measurements to transmit control signals to change the rotation of the drive shaft. In this way, the output shaft may be rotated independently of the housing by controlling the rotation of the drive shaft. In example systems, the output shaft may be a sonde or an offset mandrel coupled to a drill bit. The rive shaft may be coupled to a fluid-controlled controlled drive mechanism and rotation may be controlled by adjusting flow control valve.

Abstract: A hoist lifting system having planning and monitoring of components. The system monitors one or more components and may have a processing structure and memory storing instructions to configure the processing structure to: receive hoist machine data; determine a rotation speed of a bearing, a travel speed of a rope, a load on the bearing, a friction in the at least one bearing based on the hoist machine data; and store the rotation speed, the travel speed, the load, and the friction in a maintenance database in memory. The hoist lifting system may have the processing structure determine a wear of one or more components.

Abstract: Inversion-based workflows are provided for real-time interpretation of the electromagnetic (EM) look-around and look-ahead measurements. The profile of a look-around zone is determined by interpreting EM measurements of a look-around zone. The profile of the look-around zone characterizes formation dip as well as vertical resistivity or resistivity anisotropy of one or more formation layers of the look-around zone. The profile of a look-ahead zone is determined by interpreting EM measurements of the look-ahead zone. The profile of the look-ahead zone characterizes formation dip as well as horizontal resistivity, vertical resistivity or anisotropy of one or more formation layers of the look-ahead zone. The workflows can also involve interpretation of look-around resistivity measurements to aid in the characterization of the look-around zone.

Abstract: A method for transmitting physical uplink control channel (PUCCH) includes: receiving, by a terminal device, downlink control information (DCI) sent by a network device, the DCI including trigger information of aperiodic channel state information (CSI) and configuration information of a PUCCH carrying the aperiodic CSI; and transmitting, by the terminal device, the aperiodic CSI on the PUCCH according to the configuration information of the PUCCH when the trigger information triggers the terminal device to report the aperiodic CSI.

Abstract: A drill string rotation angle sensor diagnostic system includes a first rotation angle sensor assembly, a second rotation angle sensor assembly, an operator interface; and a control module. The control module is configured to receive a first signal from the first rotation angle sensor assembly, receive a second signal from the second rotation angle sensor assembly, determine if a valid state exists based on the first signal and the second signal, and indicate a fault on the operator interface if a valid state does not exist.

Abstract: A virtual hoist stop system for a mobile drilling machine may include a sensor assembly configured to monitor a full/empty status of a plurality of pipe storage slots, a drill string status, and a height of a rotary head, an operator interface configured to receive hoisting input, and a control module. The control module may be configured to receive signals from the sensor assembly, determine a target height based on the signals, receive hoisting input from the operator interface, and automatically stop the rotary head from hoisting beyond the target height.

Abstract: Various implementations described herein refer to an apparatus having an instrument cluster with accelerometers and gyroscopic sensors. The apparatus may include a controller that communicates with the instrument cluster, receives measurement data from the accelerometers and the gyroscopic sensors, and acquires a computed tool orientation of a drilling tool based on the measurement data from the accelerometers and the gyroscopic sensors. The controller may generate tool steering commands for the drilling tool based on a difference between a planned tool orientation and the computed tool orientation.

Abstract: A method for operating a wireless transmitter and a wireless receiver, wherein the wireless transmitter is assigned to a tool and is adapted to detect an operation condition of the tool and to send an operation condition signal as a function of the detected operation condition. The wireless receiver is assigned to an apparatus and is adapted to receive the sent operation condition signal and to control an operation condition of the apparatus as a function of the received operation condition signal. The method assigns the wireless transmitter and the wireless receiver by a user-operated, electric assignment apparatus such that the receiver controls the operation condition of the apparatus as a function of the received operation condition signal. The assignment apparatus is separate from the transmitter and the receiver.

Abstract: The disclosure is directed to a method and system to provide electrical current to a downhole tool, such as an active magnetic ranging tool. The electrical current can be transmitted through a drill string, with an end attached drilling assembly inserted into a wellbore. The downhole tool can include a power isolation sub to create an isolated electrical zone along the drill string. The downhole tool can transmit an electrical current along a designated portion of a subterranean formation to create a resultant magnetic field to be detected by the active magnetic ranging tool or other downhole tools. A drilling wellbore can maintain drilling operations while actively ranging a target well for intercept and other operations. The drilling assembly does not need to be removed from the wellbore to enable the activities of the active magnetic ranging tool, and access to the target wellbore is not needed.

Abstract: A window mill includes a body having a first end, a second end, and an intermediate portion extending therebetween. A passage is formed in the body extending from the first end toward the second end. An opening extends through the second end and fluidically connects to the passage. A hydraulic line connector extends through the opening into the passage. The hydraulic line connector includes a first portion having an inlet arranged in the passage, a second portion that projects outwardly of the second end of the body, a longitudinal axis defined between the first portion and the second portion, and a frangible zone arranged between the first portion and the second portion. At least one of the first portion and the second portion includes a debris filter.

Abstract: A method of controlling a well in a geological structure, the well comprising: a first casing string (12a), and a second casing string (12b) at least partially inside the first casing string thus defining a first inter-casing annulus therebetween. A primary fluid flow control device (16a), such as a wirelessly controllable valve, is provided in the second casing string (12b) to provide fluid communication between the first inter-casing annulus (14a) and a bore (14b) of the second casing string (12b). In the event of well “blow-out”, a relief well (40) may be drilled and a fluid communication path formed between the relief well and the first casing string of the well rather than extend to lower and/or narrower sections of casing. A kill fluid can then be introduced via the relief well (40) and the primary fluid flow control device (16a) used to direct fluid to the second casing bore (14b).

Abstract: The articulated wireline hole finder is a modular device which attaches to the bottom of a wireline logging tool-string to aid conveyance down irregular shaped and/or deviated boreholes which possess features such as ledges, washouts, and contractions, that might otherwise terminate full descent of the tool-string to the bottom of the borehole and thereby compromise the wireline data acquisition objectives. Elements of the articulated wireline hole finder may include a low friction roller nose assembly and spacer sub, an articulated spring joint, that transfers tool-string weight and directs lateral movement of the roller nose towards hole center, and a pair of five arm centralizers that possess a wide dynamic range.

Abstract: A flow control apparatus comprising: a housing, a housing passage disposed within the housing, a subterranean formation flow communicator for effecting flow communication between the subterranean formation and the housing passage, a flow control member, displaceable, relative to the subterranean formation flow communicator, for effecting at least opening of the subterranean formation flow communicator There is further provided a first actuation system for actuating displacement of the flow control member relative to the subterranean flow communicator. There is also provided a second actuation system for actuating displacement of the flow control member relative to the subterranean flow communicator. Relative to the central longitudinal axis of the housing passage, the first actuation system is angularly spaced from the second actuation system.

Abstract: Systems and methods for active ranging-while-drilling (ARWD) for collision avoidance and/or well interception. A method for electromagnetic ranging of a target wellbore may comprise disposing a downhole measurement tool into a wellbore, wherein the downhole measurement tool may comprise receivers comprising at least one radially spaced pair of the receivers and at least one axially spaced pair of the receivers; performing field measurements with the receivers, where a first set of field measurements are from at least one radially spaced pair of the receivers, and a second set of field measurements are from at least one axially spaced pair of the receivers; and calculating at least one target well parameter of a target well from at least one of the first set of field measurements and the second set of field measurements.

Abstract: There is described a method for automatically controlling a drilling operation. The method comprises obtaining a recording of one or more controlled drilling parameters adjusted, during a first drilling operation, in response to one or more controlling drilling parameters. The method further comprises, during a second drilling operation subsequent to the first drilling operation, monitoring the one or more controlling drilling parameters. The method further comprises, during the second drilling operation, automatically adjusting the one or more controlled drilling parameters in response to the monitored one or more controlling drilling parameters by using the recording of the one or more controlled drilling parameters. Thus, by recording a driller's instructions once (during a recording phase) and automatically replaying them during successive playback phases, drilling is made more efficient and simpler.

Abstract: A steering tool for use in a wellbore may comprise a tool housing having a bore and containing a steering cylinder, a steering blade, and a ring valve configured to control fluid flow to the steering cylinder. The ring valve may include a gear housing, a manifold fluidly coupling the bore to the steering cylinder, a valve seat, a valve carrier circumferentially supporting the valve seat, an upper valve housing mechanically coupled to the gear housing, a lower valve housing mechanically coupled to the upper valve housing and reciprocably coupled to the valve carrier, and at least one biasing means positioned between the valve carrier and the lower valve housing and configured to urge the valve carrier away from the lower valve housing.

Abstract: A downhole steering system includes a substantially tubular housing, a shaft positioned within the substantially tubular housing, a first bearing and a second bearing, the first and second bearings being configured to support rotation of the shaft relative to the housing. The first bearing, the second bearing, the shaft, and the housing at least partially define a chamber therebetween. The system also includes at least one structure positioned axially between a the first and second bearing and being configured to extend from an exterior of the housing in response to pressure communicated to the chamber.

Abstract: A method and system for determining a position of a second production wellbore. The method may comprise inducing a first current into a first conductive member with a first source, emitting a first magnetic field generated by the first current from the first conductive member into a formation, inducing a second current into a second conductive member with a second source, emitting a second magnetic field generated by the second current from the second conductive member into the formation, disposing an electromagnetic sensor system into the second production wellbore, recording the first magnetic field with the at least one sensor from the formation, and recording the second magnetic field with the at least one sensor from the formation. The system may comprise a first source, an electromagnetic sensor system, at least one sensor and an information handling system configured to determine the position of the second production wellbore.

Abstract: A variable build motor downhole tool allows changing the build rate in a directional drilling operation without pulling the drill string from the hole and replacing a fixed build sub in the drill string. A pad can be extended upon command to increase the build rate and retracted upon command to decrease the build rate. The pad is mounted on an insert disposed within an outer housing and extends outwardly through the outer housing by action of one or more pistons. Electronics housed in the variable build motor tool are used to receive commands from uphole and cause the pistons to extend, forcing the pad outward to increase the build rate.

Abstract: New methods for determining the volumetric composition and saturation of methane and NGLs (natural gas liquids: ethane, propane, butane, and pentane) in a petroleum reservoir combining NMR (nuclear magnetic resonance) logging and NMR core analysis and for determining the mean pore-size and tortuosity of the light hydrocarbon-filled porosity in a petroleum reservoir using NMR core analysis.

Abstract: A method for generating an output of a downhole inertial measurement unit (IMU) includes: generating a trajectory between a plurality of survey points of a planned well data as a function of time, wherein the planned well data includes a plurality of three-dimensional coordinates corresponding to the survey points of an underground planned well are used to generate a trajectory comprising a plurality of trajectory coordinates between the consecutive ones of the survey points; generating sensor data for each of the trajectory coordinates as a function of time based on the geodetic reference parameters, the generated sensor data comprising: generated accelerometer output; generated gyroscopic output; and generated magnetometer output; and outputting the generated accelerometer output; the generated gyroscopic output; and the generated magnetometer output as a function of time as a generated output of the downhole IMU.

Abstract: There is provided herein a system and method for automatically determining a path within a target rock unit of a directionally drilled well (a target well) using log readings, e.g., gamma log readings, taken in the target well as compared with log readings (a typelog) taken in a well that penetrates the target rock unit (an offset well). Most specifically, in some embodiments the path of the target well within the target rock unit will be obtained by solving a minimum travel distance problem which uses distances that are based on differences between well log readings in the target and offset wells. Solution of this problem will yield a collection of stratigraphic blocks lengths and dips that define a path of a well in a subsurface through the target formation or rock unit.

Abstract: A system and method are used in drilling a borehole in a formation. A trip to move a drillstring in the borehole is identified, where the trip is expected to produce a piston effect that changes a downhole pressure of the fluid in the borehole. A peak speed to move the drillstring in the borehole is calculated for the trip, and adjustments to a surface backpressure of the drilling system is calculated for the trip at the calculated peak speed to keep the downhole pressure within a tolerance of the formation. The drillstring is moved in the trip according to the calculated peak speed, and the downhole pressure change produced by the piston effect is counteracted by automatically adjusting the surface backpressure according to the calculated adjustments.

Abstract: The invention relates to a method for determining the value of one or more parameters relating to the state of health of at least one accumulator of a battery that is intended to provide electrical energy to an external application, an electronic battery management system implementing this method, and a battery provided with this system.

Abstract: A method of aligning a wafer for semiconductor fabrication processes may include applying a magnetic field to a wafer, detecting one or more residual magnetic fields from one or more alignment markers within the wafer, responsive to the detected one or more residual magnetic fields, determining locations of the one or more alignment markers. The marker locations may be determined relative to an ideal grid, followed by determining a geometrical transformation model for aligning the wafer, and aligning the wafer responsive to the geometrical transformation model. Related methods and systems are also disclosed.

Abstract: A downhole closed loop method for controlling a curvature of a subterranean wellbore while drilling includes controlling a direction of drilling such that the drilling attitude is substantially equal to a setpoint attitude. A setpoint rate of penetration is processed in combination with a setpoint dogleg severity to compute a setpoint attitude increment. The setpoint attitude may be adjusted by the setpoint attitude increment. The setpoint attitude may be incremented at some interval to control the curvature of the wellbore while drilling.

Abstract: A system for ranging between two wellbores. The target wellbore includes a conductive body (e.g., casing) disposed within a portion of the target wellbore. A second wellbore includes an electromagnetic field sensing instrument positioned within the wellbore. A current delivered to the conductive body in the target wellbore results in a magnetic field emanating from the target wellbore. The electromagnetic field sensing instrument is utilized to measure an electromagnetic gradient based on the magnetic field, which electromagnetic gradient can be utilized to determine the range between the wellbores.