Abstract: An artificial lift system for a horizontal well deploys a downhole pump and flexible bladder reservoir chamber to be used with a conventional rod pump. The rod pump is used in the vertical at the top of the curve. The flexible bladder reservoir chamber is connected to the rod pump intake. The downhole pump is set in the producing formation and is connected to the reservoir chamber by tubing. The lift system uses a compressor drive system to operate the downhole pump to move fluids from the producing formation to the reservoir chamber. The reservoir chamber uses the flexible chamber bladder that is filled with well fluids by operation of the downhole pump to provide a continuous supply of well fluids to the rod pump intake. Operation of the rod pump lifts fluids from the flexible chamber bladder without regard to the operation state of the downhole pump.

Abstract: Flow control systems are described for variably resisting flow of a fluid composition dependent on the surface energy of the fluid composition. Surface energy is a measure of the wettability of a surface with a particular the fluid. Surface energy dependent flow resistors of the present disclosure include a support structure extending across and/or filling a control passageway such that the surface area exposed to a fluid may be maximized. The flow control systems described may autonomously distinguish between fluid compositions having high and low proportions of a desired fluid component even when the fluid compositions have substantially equal viscosities. Flow control valves are described which may be employed in downhole production and injection equipment.

Abstract: A drill bit performs pilot rock-breaking using an outer annular drill bit and breaks a central rock pillar using a central drill bit mounted in the middle of the annular drill bit and located inside a drill bit body to induce unloading of a bottom hole stress. A method mixes rock debris produced by rock breaking of the central drill bit as abrasive with the drilling fluid flowing into the entire drill bit as abrasive jet liquid phase to form an abrasive jet. The method includes obtaining an annular borehole by braking, and breaking the rock pillar at the inner side of the annular borehole to induce unloading of the bottom hole stress, mixing the rock debris produced by breaking the rock pillar at the inner side of the annular borehole as abrasive with the drilling fluid entering the drill bit to form an abrasive jet.

Abstract: A hybrid drill bit includes a bit body having a plurality of fixed cutters disposed thereon and at least one rolling-cutter pocket. The hybrid drill bit further includes a rolling cutter rotatably positioned within the rolling-cutter pocket on the bit body. The rolling cutter includes a roller body with an axial bore and a plurality of teeth arranged around the roller body to engage a subterranean formation. Additionally, the hybrid drill bit includes a rolling cutter retention mechanism including a pin received within the axial bore of the rolling cutter, the pin engaging the bit body to rotatably couple the rolling cutter within the rolling-cutter pocket in the bit body.

Abstract: A sliding valve has a valve body, a sliding sleeve received in a longitudinal bore of the valve body, and a collet receivable in a longitudinal bore of the sliding sleeve. The valve body has one or more fluid ports on an uphole portion of the sidewall thereof. The sliding sleeve is movable between an uphole closed position closing the one or more fluid ports and a downhole open position opening the one or more fluid ports. The sliding sleeve has a sleeve-profile formed at least by one or more sleeve-grooves and one or more sleeve-ridges longitudinally distributed on an inner surface thereof. The collet has a flexible collet-profile formed by at least one or more collet-grooves and one or more collet-ridges respectively corresponding to the sleeve-grooves and sleeve-ridges. The length of each sleeve-ridge or collet-ridge is smaller than that of corresponding sleeve-groove or collet-groove.

Abstract: A shock tool for reciprocating a drillstring includes an outer housing. The outer housing has a central axis, a first end, a second end opposite the first end, and a passage extending axially from the first end to the second end. In addition, the shock tool includes a mandrel assembly coaxially disposed in the passage of the outer housing and configured to move axially relative to the outer housing. The mandrel assembly has a first end axially spaced from the outer housing, a second end disposed in the outer housing, and a passage extending axially from the first end of the mandrel assembly to the second end of the mandrel assembly. The mandrel assembly includes a mandrel and a first annular piston fixably coupled to the mandrel. The first annular piston is disposed at the second end of the mandrel assembly and sealingly engages the outer housing.

Abstract: The present invention relates to an abandonment plug for plug and abandonment of a well, said abandonment plug comprising a first end part being closable or closed, a second end part being tubular and having a groove in an inner face, an expandable metal sleeve arranged between the end parts, the end parts being more rigid than the expandable metal sleeve, and an unit releasably connected to the second tubular end part, the unit comprising at least one radially projectable fastening element, a unit sleeve, and a piston movable in the unit sleeve for, in a first position, forcing the radially projectable fastening element and, in a second position, being offset in relation to the radially projectable fastening element, allowing the radially projectable fastening element to move radially inwards. Furthermore, the present invention relates to a plug and abandonment system comprising the abandonment plug according to the present invention.

Abstract: The present invention relates to a combined crushing super-variable-diameter drill bit for natural gas hydrate exploitation, including a joint, an outer cylinder connected to the joint by thread, a nozzle I mounted in the outer cylinder, a mechanical locking mechanism, a blade telescoping mechanism, an end cap connected to the outer cylinder by thread, a seal ring IV mounted to the end cap, and a nozzle II mounted in the end cap by threaded connection. The present invention achieves integrated operation of conventional drilling and draw-back expanding, which can effectively solve the problems that the existing hydrate drill bit cannot drill a large borehole, cannot mechanically lock an extending position of the blade to stabilize the size of the borehole, and a single crushing method is inefficient.

Abstract: A system and method for conveying a tool to a target sub within a tubular string having a number of subs. Each sub may include at least one ledge or shoulder in or on its interior surface that can be used as a latch stopper or stopper, for receiving and engagement with a latch. The subs may also have a latch deflector or deflector. In one embodiment, the latch deflector is a latch-deflection shoulder protruding into the internal diameter (ID) of the string for deflecting a latch, to be subsequently introduced, out of or into the latch-stopping shoulder. The distance between the latch stopper and the latch deflector, referred to as the “deflection radius,” may be used as an address that uniquely identifies each sub, and can vary from sub to sub.

Abstract: This disclosure relates to a percussive drill bit comprising PCD studs and a hard facing material that is strategically located to minimise stud pop outs and the amount of hard facing material used.

Abstract: A hole opener includes a body with cone arms. The body includes pockets formed in the body in which each of the pockets includes a forwardly-positioned shoulder pocket section, a rearwardly-positioned tapered pocket section and a base opening axially extending through a wall of the corresponding pocket that receives a fastener therethrough. The cone arms each include a cone head attached to an arm. The arm includes a forwardly-positioned shoulder arm section, a rearwardly-positioned tapered arm section, and a rearwardly-facing opening axially extending through the rearwardly-positioned tapered arm section that receives the fastener.

Abstract: Stable back pressure control devices are used to control fluid pressure in a wellbore to provide constant downhole pressure. Back pressure may be estimated from a correlation between the speed of a mud pump and the pressure exerted from the pump. Drilling plans disclosed herein provide for the continued operation of one or more back pressure control devices for providing constant bottomhole pressure when casing connections are being made.

Abstract: An interchangeable orifice wellhead system is disclosed which comprises a flow control valve comprised of a male union, a female union, a valve cap, and an orifice plate. The orifice plate can include a display tab, which visually communicates to the technician the size of orifice plate aperture. Orifice plates having different size apertures can be interchanged within the same flow control valve. In some embodiments, the male union of the flow control valve can be machined or interchanged with another male union to be used with different size orifice plates.

Abstract: Methods, devices, and systems of downhole tools are disclosed. The tools each has a sleeve attached to a mandrel to form a composite frac or bridge plug or similar coupling to a downhole tool tubing product without the use of shear pins. The engagement between the mandrel and the sleeve includes a load breaking ledge, threads, ring and groove combination, and helical spiral groove with a helical coil.

Abstract: In one aspect, a wellbore system is disclosed that in one non-limiting embodiment includes a cement section in the wellbore formed to prevent flow of fluids including hydrocarbons through the cement section, a plug disposed uphole of the cement section to provide a space between the cement section and the plug and a sensor in the space for providing measurements relating to a parameter of interest. In one aspect, the parameter of interest may include one or more of presence and extent of a hydrocarbon, presence of moisture; pressure; and temperature. The system may further include a transmitter that transmits measurements from the sensor via a communication line or wirelessly to a receiver for processing the sensor measurements.

Abstract: A directional drilling system includes a bottomhole assembly having a drill bit and a steering tool configured to adjust a drilling direction in real-time. The system also includes a first feedback loop that provides a first steering control signal to the steering tool, and a second feedback loop that provides a second steering control signal to the steering tool. The system also includes a set of sensors to measure at least one of strain and movement at one or more points along the bottom-hole assembly during drilling, wherein the first and second steering control signals are based in part on the strain or movement measurements.

Abstract: A wellbore servicing tool comprising a housing at least partially defining an axial flowbore, the housing comprising one or more ports, a sliding sleeve, and a fluid delay system. The sliding sleeve is slidably positioned within the housing and transitionable from a first position in which the sliding prevents fluid communication via a route of fluid communication via the one or more ports to a second position in which the sliding sleeve allows fluid communication via the route of fluid communication via the one or more ports. The fluid delay system is configured to retain the sliding sleeve in the first position until actuated and to allow the sliding sleeve to transition from the first position to the second position at a controlled rate when actuated. The fluid delay system is actuatable via a wireless signal.

Abstract: A wellbore tubing string assembly comprises: a string including an inner bore having an inner diameter and a plurality of tools installed along the string including a first tool and a second tool axially offset from the first tool along the string; the first tool includes: a first sleeve in the inner bore having an inner surface, the inner surface defining a first restriction diameter smaller than the inner diameter; a first sensor mechanism in communication with the first sleeve and responsive to an application of force against the first sleeve; the second tool includes; a second sleeve in the inner bore having an inner wall surface, the inner wall surface defining a second restriction diameter smaller than the inner diameter; a second sensor mechanism in communication with the second sleeve and responsive to an application of force against the second sleeve; and a sealing device having a diameter greater than the second restriction diameter and being deformable to be pushable through the second restriction

Abstract: Disclosed are wellbore flow control devices that allow on-site field adjustments to flow characteristics. One autonomous inflow control device (AICD) assembly includes a base pipe defining one or more flow ports and an interior, a first end ring and a second end ring each arranged about the base pipe, the second end ring being axially-offset from the first end ring such that a fluid compartment is defined therebetween, an AICD arranged within the fluid compartment and having at least one fluid inlet and an outlet configured to be in fluid communication with one of the one or more flow ports, and a flow ring arranged about the base pipe and in fluid communication with the AICD, the flow ring being operable to regulate a fluid flow into the interior of the base pipe and being accessible and manipulatable by a well operator on-site.

Abstract: A method of stimulating a subterranean formation using a tubular member with one or more burst disks therein.