Abstract: Downhole fluid typing with pulsed neutron logging. A method comprises obtaining gamma count rates at a particular borehole depth; calculating a fluid type indicative response value for the borehole depth; determining at least one fluid type based on the response value for the particular borehole depth; and producing a display of the at least one fluid type corresponding to the borehole depth. A system comprises a downhole tool comprising a neutron source and at least one gamma detector; gamma count rates produced due to gamma arrivals at the gamma detector(s); and a processor coupled to a memory, wherein the memory stores a program that, when executed by the processor, causes the processor to: calculate a fluid type indicative response value for a particular borehole depth based on the gamma count rates; and determine at least one fluid type based on the response value for the particular borehole depth.

Abstract: A method of servicing a wellbore, comprising placing a plurality of Micro-Electro-Mechanical System (MEMS) sensors in a wellbore composition, placing the wellbore composition in the wellbore, obtaining data from the MEMS sensors using a plurality of data interrogation units spaced along a length of the wellbore, and telemetrically transmitting the data from an interior of the wellbore to an exterior of the wellbore using a conduit positioned in the wellbore. A system, comprising a wellbore extending the earth's surface, a conduit positioned in the wellbore, a wellbore composition positioned in the wellbore, the wellbore composition comprising a plurality of Micro-Electro-Mechanical System (MEMS) sensors, and a plurality of data interrogation units spaced along a length of the wellbore and adapted to obtain data from the MEMS sensors and telemetrically transmit the data from an interior of the wellbore to an entrance of the wellbore via the conduit.

Abstract: A wellbore fluid pressure measurement system includes a densometer adapted to measure a fluid density of a fluid flowing in a tubing system; and a monitoring unit communicably coupled to the densometer. The monitoring unit is adapted to receive a plurality of values representative of the fluid density from the densometer and includes a memory adapted to store the plurality of values representative of the fluid density; and one or more processors operable to execute a fluid pressure measurement module. The module is operable when executed to determine a fluid pressure of the fluid based on at least a portion of the values representative of the fluid density.

Abstract: This invention is directed to a downhole method and apparatus for simultaneously determining the horizontal resistivity, vertical resistivity, and relative dip angle for anisotropic earth formations. The present invention accomplishes this objective by using an antenna configuration in which a transmitter antenna and a receiver antenna are oriented in non-parallel planes such that the vertical resistivity and the relative dip angle are decoupled. Preferably, either the transmitter or the receiver is mounted in a conventional orientation in a first plane that is normal to the tool axis, and the other antenna is mounted in a second plane that is not parallel to the first plane. Although this invention is primarily intended for MWD or LWD applications, this invention is also applicable to wireline and possibly other applications.

Abstract: A gas sensor uses optical interferents in a porous thin film cell to measure the refractive index of the pore medium. As the medium within the pores changes, spectral variations can be detected. For example, as the pores are filled with a solution, the characteristic peaks exhibit a spectral shift in one direction. Conversely, when tiny amounts of gas are produced, the peaks shift in the opposite direction. This can be used to measure gas evolution, humidity and for applications for other interferometric-based sensing devices.

Abstract: Among many things, in some embodiments, improved viscoelastic surfactant gels that comprise non-aqueous tackifying agents, and their associated methods of use, are provided. In one embodiment, the methods comprise: providing a treatment fluid that comprises an aqueous base fluid, a non-aqueous tackifying agent, and a viscoelastic surfactant; and introducing the treatment fluid into a subterranean formation.

Abstract: A gamma ray detector assembly for a borehole logging system that requires the measure of gamma radiation with optimized gamma ray energy resolution and with fast emission times required to obtain meaningful measurements in high radiation fields. The detector assembly comprises a lanthanum bromide (LaBr3) scintillation crystal and a digital spectrometer that cooperates with the crystal to maximize pulse processing throughput by digital filtering and digital pile-up inspection of the pulses. The detector assembly is capable of digital pulse measurement and digital pile-up inspection with dead-time less than 600 nanoseconds per event. Pulse height can be accurately measured (corrected for pile-up effects) for 2 pulses separated by as little as 150 nanoseconds. Although the invention is applicable to virtually any borehole logging methodology that uses the measure of gamma radiation in harsh borehole conditions, the invention is particularly applicable to carbon/oxygen logging.

Abstract: An attenuation apparatus, system, and method are disclosed. The attenuator is attached to a pipe and includes a housing that includes an inner sleeve and an outer sleeve. The attenuator includes one or more masses, to resonate when exposed to waves including acoustic frequency components.

Abstract: Methods and compositions useful in treating subterranean formations, and more particularly, breaker compositions that may be useful in treating subterranean formations wherein synthetic polymers are used, are provided. Of the many methods and compositions provided herein, one composition comprises a source of hydrogen peroxide and an activator. One method comprises providing a polymer breaker composition comprising a source of hydrogen peroxide and an activator; introducing the polymer breaker composition into a well bore which penetrates a subterranean formation; allowing the activator to activate the source of hydrogen peroxide to create an oxidizing species; and allowing the oxidizing species to break synthetic polymers present in the subterranean formation.

Abstract: Treatment fluids for and methods of treating subterranean formations are provided. In certain embodiments, a method is provided comprising providing a treatment fluid comprising a relative permeability modifier, a delayed filter cake breaker, and a carrier fluid, contacting at least a portion of a filter cake in a subterranean formation with the treatment fluid, and removing at least a portion of the filter cake.

Abstract: A method and apparatus for controlling oil well drilling equipment is disclosed. One or more sensors are distributed in the oil well drilling equipment. Each sensor produces a signal. A surface processor coupled to the one or more sensors via a high speed communications medium receives the signals from the one or more sensors via the high speed communications medium. The surface processor is situated on or near the earth's surface. The surface processor includes a program to process the received signals and to produce one or more control signals. The system includes one or more controllable elements distributed in the oil well drilling equipment. The one or more controllable elements respond to the one or more control signals.

Abstract: A method of locating a wellbore feature, comprising delivering a mechanical position determination tool into the wellbore, selectively causing an undulating curvature of the mechanical position determination tool in response to a change in a fluid pressure, moving the mechanical position determination tool along a longitudinal length of the wellbore, and sensing a change in resistance to continued movement of the mechanical position determination tool. A mechanical position location tool for a wellbore, comprising pressure actuated elements configured to cooperate to selectively provide an unactuated state in which the mechanical position location tool lies substantially along a longitudinal axis and the pressure actuated elements further configured to cooperate to selectively lie increasingly deviated from the longitudinal axis in response to a change in pressure applied to the mechanical position location tool.

Abstract: A method of servicing a wellbore, comprising placing a plurality of Micro-Electro-Mechanical System (MEMS) sensors in a wellbore composition, pumping the wellbore composition into the wellbore at a flow rate, determining velocities of the MEMS sensors along a length of the wellbore, and determining an approximate cross-sectional area profile of the wellbore along the length of the wellbore from at least the velocities of the MEMS sensors and the fluid flow rate. A method of servicing a wellbore, comprising placing a plurality of Micro-Electro-Mechanical System (MEMS) sensors in a wellbore composition, pumping the wellbore composition into the wellbore, determining positions of the MEMS sensors relative to one or more known positions along a length of the wellbore, and determining an approximate cross-sectional area profile of the wellbore along the length of the wellbore from at least the determined positions of the MEMS sensors.

Abstract: A method of servicing a wellbore, comprising placing a plurality of Micro-Electro-Mechanical System (MEMS) sensors in at least a portion of a sealant composition, placing the sealant composition in an annular space formed between a casing and the wellbore wall, and monitoring, via the MEMS sensors, the sealant composition and/or the annular space for a presence of gas, water, or both. A method of servicing a wellbore, comprising placing a plurality of Micro-Electro-Mechanical System (MEMS) sensors in a wellbore composition, placing the wellbore composition in the wellbore, and monitoring, via the MEMS sensors, the wellbore and/or the surrounding formation for movement.

Abstract: In some embodiments, apparatus and systems, as well as methods, may operate to obtain hole azimuth data or inclination data associated with a chassis (e.g., comprising a measurement or logging tool) in a borehole using interpolated data or survey data, and to determine magnetic field orientation of the chassis using a portion of the hole azimuth data, a portion of the inclination data, relative bearing data, and Earth magnetic field orientation data by reconstructing at least a portion of borehole magnetic field data that is corrupt or missing. Additional apparatus, systems, and methods are disclosed.

Abstract: A method of servicing a wellbore, comprising placing at least one piece of equipment in the wellbore comprising micro-electro-mechanical system (MEMS) sensors, wherein the MEMS sensors are disposed in one or more composite or resin portions of the equipment, and gathering wellbore data from the MEMS sensors. A method of servicing a wellbore, comprising placing at least one piece of equipment in the wellbore comprising a micro-electro-mechanical system (MEMS) sensor data interrogation unit, wherein the data interrogation unit is disposed in one or more composite or resin portions of the equipment, and gathering wellbore data from MEMS sensors located in the wellbore via the data interrogation unit.

Abstract: A method of servicing a wellbore, comprising placing a plurality of Micro-Electro-Mechanical System (MEMS) sensors in a wellbore composition, flowing the wellbore composition in the wellbore, and determining one or more fluid flow properties or characteristics of the wellbore composition from data provided by the MEMS sensors during the flowing of the wellbore composition. A method of servicing a wellbore, comprising placing a plurality of Micro-Electro-Mechanical System (MEMS) sensors in at least a portion of a spacer fluid, a sealant composition, or both, pumping the spacer fluid followed by the sealant composition into the wellbore, and determining one or more fluid flow properties or characteristics of the spacer fluid and/or the cement composition from data provided by the MEMS sensors during the pumping of the spacer fluid and sealant composition into the wellbore.

Abstract: A method of servicing a wellbore, comprising placing into a wellbore a first wellbore composition comprising a plurality of Micro-Electro-Mechanical System (MEMS) sensors having a first identifier, and determining positions in the wellbore of the MEMS sensors having the first identifiers.

Abstract: Provided herein are methods and compositions that include a method comprising contacting a metal surface with an acidic fluid comprising a corrosion inhibitor that comprises a reaction product formed from a direct or an indirect reaction of an aldehyde with a thiol and/or an amine functionalized ring structure. A composition provided includes an acidic treatment fluid that comprises an aqueous-base fluid, and acid, and a corrosion inhibitor that comprises a reaction product formed from a direct or an indirect reaction of an aldehyde with a thiol and/or an amine functionalized ring structure.

Abstract: Methods and devices for testing friction reduction systems are described herein. Embodiments of the disclosed devices allow direct measurement of fluid or rheological properties of friction reduction systems in a “one pot” or integrated device while maintaining the particles in suspension. In an embodiment, a device for testing a friction reduction system comprises an outer chamber. The device also comprises an impeller disposed at the bottom of the outer chamber for mixing the friction reduction system. In addition, the device comprises an inner chamber fixedly disposed within the outer chamber. The inner chamber has an inlet and an outlet such that the inner chamber is in fluid communication with the outer chamber. The device further comprises a bob rotatably disposed within the inner chamber.