Abstract: This system maintains bottom hole pressure and constant well bore pressure profile for a period of time in event of loss of power to rig pumps, rig pump failure or other loss of pressure to the primary flowline. The back pressure system diverts mud into the primary flowline to maintain pressure. The system provides time to get the diesel powered cement unit on line to maintain pressure or get the power reinstated to the rig pumps. The mud discharged into the primary flowline can be recovered back into the housing via the housing inlet line and the housing can be recharged via the N2 high pressure bottle rack. The back pressure system installs upstream of the MPD chokes with interfaces to the primary flow line to divert the drilling mud to the primary flowline.

Abstract: A drilling assembly and method of drilling a wellbore is disclosed. The drilling assembly includes a steering device having a tilt device and an actuation device. A first section and a second section of the drilling assembly are coupled through the tilt device, wherein the first section is attached to a drill bit. The actuation device includes an electromechanical actuator and causes a tilt of the tilt device to cause the first section attached to the drill bit and the drill bit to tilt relative to the second section. The wellbore is drilled using the drill bit. The electromechanical actuator is actuated to tilt the tilt device to cause the first section attached to the drill bit and the drill bit to tilt relative to the second section and to maintain the tilt geostationary while the drilling assembly is rotating to form a deviated section of the wellbore.

Abstract: Disclosed is a rotary steering drilling apparatus.

Abstract: A system for initiating a charge downhole in a wellbore includes a first donor charge detonable to produce a first detonation wave, a second donor charge detonable to produce a second detonation wave, and an acceptor charge detonable by either the first detonation wave or the second detonation wave. The system also includes a donor charge barrier separating the first donor charge from the second donor charge. The donor charge barrier includes heat dissipative and conduction characteristics for preventing deflagration from spreading between the first donor charge and the second donor charge. The system also includes an acceptor charge barrier separating the acceptor charge from the first donor charge and the second donor charge. The acceptor charge barrier includes Shockwave impedance characteristics for conveying the first detonation wave or the second detonation wave to the acceptor charge to detonate the acceptor charge.

Abstract: A fluid operated drilling device for drilling a hole includes a hammer connected to a drill rod, and a rotation device to rotate the drill rod and the hammer. The hammer includes a tubular main body, a back head, a cylindrical piston housing, a reciprocating piston and a space between the piston. The piston housing is divided by an annular pressurizing portion into first and second space portions for elevating and striking the piston. First communication channels from a hollow portion of the piston into a second space between the piston and the main body discharge fluid between the piston and the main body. A method for drilling a hole using the fluid operated drilling device is also disclosed.

Abstract: Methods, systems, and devices to enhance fracturing fluid delivery to subsurface formations to enhance hydrocarbon production from the subsurface formations may include providing a manifold coupling having a manifold coupling passage with a manifold coupling axis. The manifold coupling may include a first inlet passage positioned to provide fluid flow between a first fracturing fluid output and the manifold coupling passage, and a second inlet passage positioned opposite the first inlet passage to provide fluid flow between a second fracturing fluid output and the manifold coupling passage. The first inlet passage may have a first inlet passage cross-section at least partially defining a first inlet axis extending transverse relative to the manifold coupling axis. The second inlet passage may have a second inlet passage cross-section at least partially defining a second inlet axis extending transverse relative to the manifold coupling axis and not being co-linear with the first inlet axis.

Abstract: A method including circulating wellbore servicing fluid (WSF) downhole, passing the circulating WSF through a separator configured to separate solids therefrom, separating the plurality of particles into screened particles having a diameter greater than or equal to a mesh size and retained particles having a diameter less than the mesh size in a particulate-reduced WSF, adding a volume of second loss circulation material (LCM) composition including replenishment particles to particulate-reduced WSF to provide LCM-adjusted WSF, and introducing LCM-adjusted WSF downhole and circulating LCM-adjusted WSF. The WSF includes first LCM composition including plurality of particles having first cumulative particle size distribution (PSD). The LCM-adjusted WSF includes LCM-adjusted WSF LCMs. LCM-adjusted WSF LCMs include the retained and replenishment particles.

Abstract: A method and apparatus provide for separating a fluid conveyance, such as coiled tubing, wherein the apparatus includes an anchor section and a carrier that, when united, create an explosive force, separating the fluid conveyance.

Abstract: A drilling tool with power generation includes an outer housing and a driveshaft located at least partially within the outer housing and configured to rotate with respect to the outer housing via bearings located between the driveshaft and the outer housing. The drilling tool also includes an electromagnetic power generation device. The electromagnetic power generation device includes a coil and a magnet located within the housing. One of the coil and the magnet is coupled to the housing and the other is coupled to the driveshaft. Relative movement of the driveshaft with respect to the coil generates electrical power.

Abstract: A downhole apparatus comprises a casing string with a frangible disk positioned therein. A flow barrier is connected in the casing string and spaced downwardly from the frangible disk. The frangible disk and the flow barrier define a buoyancy chamber. The sliding sleeve will impact and shatter the frangible disk into a plurality of pieces that will pass downwardly in the casing after the casing has been lowered to a desired depth.

Abstract: The disclosed embodiments include pressure-activated firing heads, perforating gun assemblies, and methods to set off a downhole explosion. A pressure-activated firing head includes a first chamber and a second chamber having an energy storage element disposed within the second chamber. The pressure-activated firing head also includes a port fluidly connecting the first chamber and the second chamber. The pressure-activated firing head further includes a flow restrictor that restricts fluid flow from the second chamber to the first chamber. The pressure-activated firing head further includes a firing pin shiftable from a first position to a second position to strike an initiator. The pressure-activated firing head further includes a shear pin that holds the firing pin in the first position and configured to shear in response to a threshold pressure applied to the shear pin to release the firing pin from the first position.

Abstract: A system for gathering downhole measurements includes a drill bit, at least one nozzle receptacle located on the drill bit, and a sensor system. The sensor system has a sensor housing, a flow path extending through the sensor housing, wherein the flow path allows fluid to flow through the sensor housing, and an internal cavity provided within the sensor housing separate from the flow path. The internal cavity contains components that include at least one sensor for gathering data about drill bit conditions and downhole conditions, a powering unit, a printed circuit board, and an electrical conductor, wherein the sensor housing is installed in the at least one nozzle receptacle.

Abstract: A closed-loop hydraulic drilling system generates choke characteristic curves or data that more accurately reflects the relationship between the commanded choke valve position and the resulting pressure drop across the choke valve for a given flow rate and fluid density. The choke characteristic curves may be generated through a calibration procedure and then used during normal operations to more accurately monitor return flow and manage wellbore pressure. The specific gravity of an injected calibration fluid and pressure drop across the choke valve may be determined and correlated to the current choke valve position to reflect the choke characteristic curve in situ, thereby providing for more precise control of wellbore pressure and enabling condition monitoring of the choke valve. In addition, an improved closed-loop hydraulic drilling system does not require a flow meter, enabling the adoption of MPD systems in low-specification and economically constrained applications.

Abstract: A method of sampling a fluid from a rock formation includes deploying a downhole sampling tool to a target zone within a wellbore of the rock formation, with the downhole sampling tool being coupled to a downhole end of a drill pipe. The method further includes rotating the drill pipe within the wellbore while maintaining a body of the downhole sampling tool in a stationary angular position and while collecting samples of the fluid from the rock formation at the downhole sampling tool.

Abstract: Disclosed is a method for determining three-dimensional in-situ stress based on displacement measurement of borehole wall, including the following steps: selecting a testing borehole section for in-situ stress testing; arranging 6-9 measurement points in the testing borehole section; using a coring drill to perform a radial cut around the displacement measurement device to relieve the stress at the measurement point; cutting off the drilled core by the coring drill; recovering the sidewall coring device and removing the cores, and then measuring the elastic deformation parameters of each core; The beneficial effect of the technical scheme proposed in this disclosure is: the method provided by this disclosure overcomes the disadvantage that the measurement can only be performed at the bottom of a borehole and thus it has a wider application range.

Abstract: An apparatus for cutting into a subterranean formation includes a body and multiple cutting blades distributed around a circumference of the body. The cutting blades are configured to cut into the subterranean formation in response to being rotated. Each cutting blade includes a ball embedded in the respective cutting blade. At least a portion of the ball protrudes towards the subterranean formation from the respective cutting blade in which the ball is embedded. Each ball is configured to roll against the subterranean formation to reduce friction while the cutting blades are rotating.

Abstract: A stochastic control method includes determining a property of a solid present in a drilling fluid circulating within a mud circulation system and identifying a mud circulation model that dictates operation of the mud circulation system. The mud circulation model is based on one or more models of one or more uncertainties encountered during a wellbore drilling operation. The method further includes determining an accuracy of the mud circulation model based on a difference between the determined property of the solid present in the drilling fluid and a solid property of the drilling fluid as provided by the mud circulation model, and programming a controller of the mud circulation system based on the mud circulation model to modify operation of the mud circulation system.

Abstract: Apparatuses and methods measuring properties of drilling fluids in which the drilling fluid is contained in a structure, and a measuring device and a processor are used to measure the properties. The measuring device is immersed within the drilling fluid. The measuring device can comprise a shell defining a chamber, a weight adapted to cause the measuring device to sink through the drilling fluid, a transmitter and at least one sensor adapted to measure a property of the drilling fluid. The transmitter is adapted to transmit data representing the property to the processor.

Abstract: A diagnostic coating is applied to the surface of a wellbore service tool. The diagnostic coating has one or more constituents that undergoes an optically-detectable physical change responsive to changing values of one or more downhole parameters. After exposing the diagnostic coating of the service tool to the downhole environment, the tool may be retrieved from the wellbore and inspected to detect any physical change indicative of the service tool having been exposed to elevated values of the one or more downhole parameters.

Abstract: A system includes a bottom hole assembly and a core sampling tool. The bottom hole assembly includes a housing and a drill bit coupled to the housing. The core sampling tool includes a first compartment positioned within the housing, the first compartment including a motor; a second compartment positioned within the housing and radially spaced apart from the first compartment, the second compartment including a coring bit; and a flexible drilling shaft extending between and coupled to the motor and the coring bit.