Abstract: A wellbore tool assembly to release stuck pipe includes a tubular that includes an outer wall, an inner wall and an annular compartment defined between the outer wall and the inner wall. A quantity of acid is carried within the annular compartment of the tubular. Multiple ports are formed in the tubular. Each port fluidically connects an inner volume of the tubular with a volume outside the tubular through the annular compartment. The assembly includes a ball seat disposed within the tubular. The ball seat is configured to receive a ball dropped into the tubular. The multiple ports are configured to switch between an open position and a closed position. When in the open position, the multiple ports permit flow of the acid from the annular compartment to the formation. When in the closed position, the multiple ports prevent fluid flow from the annular compartment to the formation.

Abstract: A bit saver assembly having an inner valve sleeve that actuates upon the weight-on-bit (WOB) of the drill bit exceeding a threshold value to overcome the countervailing force provided by a spring contained within the bit saver assembly and the internal flow pressure of the drilling fluid at the area of the inner valve sleeve. Actuation of the inner valve sleeve opens a fluid passage to the wellbore annulus resulting in a reduction of drilling fluid flow pressure and the stretch of the drill string thereby reducing WOB of the drill bit without operator assistance.

Abstract: A shut-off system and control method for a rotary steerable tool that includes a body having an inner chamber, a piston gallery extending between the inner chamber and a piston port, and an exhaust gallery extending between the inner chamber and an exhaust port. A spool in the inner chamber is movable into a plurality of positions to direct and control the flow of drilling fluid to energize pistons of the rotary steerable tool. The spool includes a spool shaft. A first passage extends through the spool shaft and receives drilling fluid via a spool inlet port in the shaft from a drilling fluid inlet port of the rotary steerable tool. A shut off valve is controlled to rotate on the spool shaft to open and shut the spool inlet port to drilling fluid flow.

Abstract: A well drilling bit for drilling bedrocks includes a columnar bit body, and a drilling fluid flow path formed in the bit body to wash away drilled cuttings from a bottomhole and/or a periphery of the bit body. The flow path is provided with a venturi mechanism including a venturi tube having a reduced-diameter portion where a cross sectional area is reduced and capable of generating a decompression region around a tip of the bit body, the decompression region being more decompressed than a surrounding by the Venturi effect.

Abstract: An example drill bit includes a body that is connectable to a drill string. The body has a base configured to face downhole within a wellbore and a perimeter configured to face a wall of the wellbore. The body includes a first nozzle and a second nozzle. The first nozzle corresponds to a first channel that exits the body through the perimeter and the second nozzle corresponds to a second channel that exits the body through the base. The example drill bit also includes a bit cutter on the base of the body and a valve within the body. The valve is configured to move within the body to block either the first channel or the second channel.

Abstract: A stage tool apparatus and components for same are described. In several exemplary embodiments, the stage tool apparatus is part of tubular string or casing positioned within a preexisting structure such as, for example, a wellbore.

Abstract: Downhole tools are provided with a topographical pattern, and anti-balling material is provided over the topographical pattern. The topographical pattern may be defined by at least one of a plurality of recesses extending into a surface of a body of the tool and a plurality of protrusions protruding from the surface. Downhole tools include an insert disposed within a recess in a body, and the insert comprises an anti-balling material having a composition selected to reduce accumulation of formation cuttings on the tools when the tools are used to form or service a wellbore. Downhole tools include anti-balling material disposed over a porous mass provided over the surfaces of the tools. Methods of forming downhole tools include providing anti-balling material over features on and/or in a surface of a body of a tool. Methods of repairing downhole tools include removing an insert therefrom and disposing a replacement insert therein.

Abstract: A controller for operating a downhole tool includes a tubular body; a seat disposed in the body for receiving first and second pump-down plugs, at least a portion of one of the seat and the plugs being radially displaceable to pass through or allow passage of the other at a first threshold pressure differential; a catcher located below the seat for receiving the plugs after passing through the seat; a toggle linked to the seat to alternate between a locked position and an unlocked position in response to seating of the plugs; and a control mandrel for engaging a piston of the downhole tool and linked to the toggle: to be longitudinally movable between a first position and a second position when the toggle is unlocked, and to be prevented from movement from the first position to the second position when the toggle is locked.

Abstract: Downhole cutting tools such as blade mills comprise a body having an upper end for connection with a rotating component of a drill string and a guide member disposed at lower end. The guide member can comprise a shape that is reciprocal to an engagement member disposed on an object within the well that is to be cut by the cutting mill. In certain embodiments, the guide member comprises a portion that is spherically shaped or an apex formed by two angled cutting elements. The cutting tools can also include one or more blades having cutting elements disposed thereon in a stepped arrangement. In one such embodiment, the cutting elements are disposed to cover one or more steps profiled on a lower end of the blade to lessen wear of the blade caused by the cutting of the object by the blade.

Abstract: A drill bit for use in drilling a wellbore and that can be used for fracturing the subterranean formation surrounding the wellbore. Included on the bit body is a packer for sealing against the wellbore wall during fracturing. A chamber in the drill bit houses a valve assembly for selectively diverting fluid between use in drilling and for use in fracturing. The fluid is delivered through a drill string that attaches to an upper end of the bit. The valve assembly can be shuttled between drilling and fracturing configurations by selectively adjusting an amount and/or pressure of the fluid flowing in the drill string.

Abstract: A drill bit is disclosed, comprising: a drill bit head having a cutting face with one or more fixed cutting elements; a flow passage extending through the drill bit head to the cutting face; a flow interrupter within the drill bit head and positioned to interrupt flow of fluid through the flow passage; and a power section connected to drive the flow interrupter and cause, in operation, variable flow of fluid through the flow passage. A method of drilling is also disclosed comprising: flowing fluid through a flow passage extending through a drill bit head to a cutting face of the drill bit head, the cutting face having one or more fixed cutting elements; and driving a flow interrupter within the drill bit head with a power section to interrupt the flow of fluid through the flow passage and cause variable flow of fluid through the flow passage.

Abstract: A drilling apparatus can include a sonde housing that is elongated along a central longitudinal axis. The sonde housing has a length that extends along the central longitudinal axis from a proximal end of the sonde housing to a distal end of the sonde housing. The proximal end of the sonde housing is adapted for connection to a drill string and the distal end of the sonde housing includes a distal end face. The sonde housing further defines first and second sonde-housing fluid-delivery passages. The first and second sonde-housing fluid-delivery passages extend fluidly separately from one another throughout substantially an entire length of the sonde housing. The drilling apparatus can also include a rotary cutting tool that mounts to the distal end of the sonde housing. The rotary cutting tool can further define distinct first and second cutting-tool fluid-delivery passages. The first sonde-housing fluid-delivery passage can be in fluid communication with the first cutting-tool fluid-delivery passage.

Abstract: A dual drill string valve includes an actuator including a piston disposed in a housing. The housing is configured to couple at its ends to an end of a nested dual drill string segment. An upper internal conduit is mounted in the housing proximate one longitudinal end thereof. A lower internal conduit is mounted in the housing proximate the other longitudinal end thereof. The piston is slidably, sealingly engaged between the upper and lower inner conduits and defines a fluid flow passage therethrough. The upper inner conduit, the piston and the lower inner conduit define another flow passage between respective exterior surfaces thereof and an interior of the housing such that application of fluid pressure to the external flow passage causes movement of the piston away from the upper inner conduit. A rotary valve is coupled to the actuator whereby longitudinal movement thereof rotates the rotary valve.

Abstract: A method of hydraulically activating a mechanically operated wellbore tool in a bottom hole assembly includes: holding moveable elements of the wellbore tool in an unactivated position using a shear pin; inserting one or more drop balls into a drilling fluid; and flowing the drilling fluid with the drop balls to a flow orifice located in or below the wellbore tool. The flow orifice is at least partially plugged with the drop balls to restrict fluid flow and correspondingly increases the hydraulic pressure of the drilling fluid. The hydraulic pressure is increased to a point beyond the rating of the shear pin, thereby causing the shear pin to shear and allowing the moveable elements of the tool to move to an activated position.

Abstract: A differential pressure release sub includes a sub housing having a housing bore, a piston chamber communicating with the housing bore and at least one fluid port communicating with the piston chamber. A piston having a piston bore is disposed for axial displacement in the piston chamber from a first position wherein the at least one fluid port is fluidly sealed from the piston bore to a second position wherein the at least one fluid port is disposed in fluid communication with the piston bore. A first surface having a first surface area is on the piston. A second surface having a second surface area less than the first surface area of the first surface is on the piston.

Abstract: A valve assembly for use in an inner tube member of a core barrel head assembly positionable within a drill string of a drilling apparatus. The valve assembly works using two separate surfaces and a biasing element with a force. When hydrostatic pressure is present forces are created on these surfaces, these forces have a direct relationship with pressure, as an increase in pressure will increase the force and vice versa. The surface areas are designed such that the valve will maintain closed while under a predetermined fluid pressure, indicating to the driller that the inner tube has landed. When the driller relieves the fluid pressure and the pressure decreases, the force difference between the respective forces decreases until the valve opens for drilling through the force from the biasing element.

Abstract: A down-the-hole drill hammer for optimizing air consumption. The down-the-hole drill hammer includes a housing, a backhead connected to the housing, and a pressure control check valve assembly mounted within the housing. The pressure control check valve assembly includes a first check valve and a second check valve. The first check valve controls a flow of working fluid through the backhead. The second check valve is mounted to the first check valve and controls a flow of working fluid through the first check valve.

Abstract: A valve assembly for use in an inner tube member of a core barrel head assembly positionable within a drill string of a drilling apparatus. The valve assembly works using two separate surfaces A and B and a biasing element with a force FS. When hydrostatic pressure is present forces are created on these surfaces: FA and FB. These forces have a direct relationship with pressure, as an increase in pressure will increase the force and vice versa. The surface areas are designed such that: FA>FB+FS, which will maintain the valve closed while under a predetermined fluid pressure, indicating to the driller that the inner tube has landed. When the driller relieves the fluid pressure and the pressure decreases, the force difference between FA, FB and FS decreases until FA<FB+FS, thus opening the valve for drilling.

Abstract: A downhole bypass valve comprises a tubular body including a side port and a sleeve axially movably mounted in the body and normally biased to a closed position to close the side port. An activating device is configured to be pumped or dropped into the body to engage the sleeve and permit movement of the sleeve to an open position and open the side port. A latch has a part in the body and a part in the activating device, the parts of the latch configured to engage and retain the sleeve in the open position. The activating device is further operable to disengage from and translate through the sleeve and the parts of the latch are further operable to disengage and permit the sleeve to return to the closed position.

Abstract: A drilling apparatus includes a tubular body including an upper connection and a lower connection with a drill bit disposed thereon, and an axial borehole therethrough, wherein the upper connection is configured to attach to a drillstring, primary cutter blocks coupled to the tubular body and configured to selectively expand radially therefrom. The drilling apparatus further includes backup cutter blocks coupled to the tubular body and configured to selectively expand radially therefrom, and an activation system configured to selectively expand and collapse the primary and backup cutter blocks in response to changes in weight applied to the primary and backup cutter blocks.

Abstract: Bypass valve comprising a ported housing (1) and concentrical ported sleeve (2). Ported piston (3) is slidably arranged within the sleeve. Between sleeve and piston is a control system consisting of control element (5) fixed to sleeve (2) by means of plugs (7) passing through apertures (49) and holes (68). Noses (35) protrude into recesses (34) of drive element (4). Saw teeth (31) on drive element (4) interact with teeth (29) on rotatable timing element (6). Key (27) on element (6) interacts with teeth (32) on control element (5). Lower end (70) of key is abutting against ridge (67) formed on inner surface of sleeve (2). when key (27) is engaged to teeth (32), teeth (31, 29) on elements (4, 6) are misaligned. Pressure increase results in piston (3) and drive element (4) moving downward freeing key (27) from engagement with teeth (32). Teeth (31, 29) are forced into alignment with subsequent rotation of timing element (6). In this position, ports on piston and sleeve are partially aligned.

Abstract: A system includes a valve assembly configured to be disposed within a downhole tool module, a valve of the valve assembly configured to regulate flow of a fluid within the downhole tool module, a pump configured to supply a hydraulic fluid to actuate the valve, and an actuator configured to drive the pump.

Abstract: A mud saver valve (MSVIII), positionable at the bottom of the drill string, above the bit, which includes an elongated body portion; portion of the valve housing a compressible spring a pressure; a valve mechanism of a plunger and seat, the plunger moveable between open and closed positions within the valve by concentric actuator pistons; while in the closed position, drilling fluid cannot pass through the valve; when a combination of static and pump pressure exceeds the setting pressure of the spring, the plunger will be unseated by the concentric actuator pistons to the open position, at which time drilling fluid is allowed to through the valve; wherein when the valve is normally closed, as long as the fluid column pressure is less than the setting pressure, the valve remains closed, and allows the drill string to be disconnected and a section of pipe can be added without the fluid draining from the drill column above the bit, and thus saving fluid.

Abstract: A method and apparatus for improving the efficiency of a drill string that includes drilling pipe, a dump valve, a positive displacement motor and a rotary drill bit driven by the motor utilize a dump valve that does not depend upon a pressure loss to maintain the dump valve in a position which closes communication between the drilling string and the annulus between the drilling string and the well bore or casing. The dump valve includes a flow sleeve that is axially moved to close outlet passages to the annulus by the flow of fluid through the outlet passages rather than a pressure drop across the flow sleeve.

Abstract: A directional drilling tool includes a housing defining a central cavity for enabling the transmission of drilling fluid through the drill string. A motor contained in the housing includes a rotor-stator assembly, and produces eccentric motion of the rotor. An inverter or shock absorbing assembly disposed along the housing upstream from the motor functions to expend and contract the central cavity in response to fluid pressure changes produced by the drilling fluid flow. A valve assembly, comprising a multi-port flow head that rotates under influence of the motor and a multi-port flow restrictor, creates a varying pattern of pressure spikes in the drilling fluid as the ports of the flow head move into and out of alignment with the ports of the flow restrictor, which in turn induces a percussive effect and axial movement in the drill string.

Abstract: A method of drilling a well and installing a liner includes assembling concentric inner and outer strings of tubulars. A drill bit is located at the lower end of the inner string and a liner with a liner hanger makes up part of the outer string. The inner and outer strings may be rotated in unison to drill the well. A valve is located upstream of a liner hanger control tool used to release and set the liner hanger in the drill string. The valve comprises a ported sleeve that slides relative to a ported housing to meter flow from the interior of the drill string to the annular space. The redirected flow maintains a minimum flow rate in the annular space to prevent cuttings from settling on the control tool. A portion of the valve can further be used with a dart to manipulate downstream equipment.

Abstract: A method of drilling a well and installing a liner includes assembling concentric inner and outer strings of tubulars. A drill bit is located at the lower end of the inner string and a liner with a liner hanger makes up part of the outer string. The inner and outer strings may be rotated in unison to drill the well. A valve is located upstream of a liner hanger control tool used to release and set the liner hanger in the drill string. The valve comprises a ported sleeve that slides relative to a ported housing to meter flow from the interior of the drill string to the annular space. The redirected flow maintains a minimum flow rate in the annular space to prevent cuttings from settling on the control tool. A portion of the valve can further be used with a dart to manipulate downstream equipment.

Abstract: Method and drill string valve assembly for closing a conduit through which a high pressure fluid flows. The drill string valve assembly includes first, second and third portions forming an elongated housing having an inside cavity; and a drill string valve provided inside the cavity, to extend from the first portion to the third portion. The second portion has an extension that fits inside a groove of the third portion and prevents the second portion to linearly move relative to the third portion and also allows the second portion to rotate relative to the third portion, and the second portion has a distal region provided with a thread configured to engage a corresponding thread of the first portion such that a rotation of the second portion relative to the third portion determines a tight connection between the first portion and the second portion.

Abstract: An apparatus for keeping a down hole drilling tool vertically aligned has a tubular body having an axis, an inner bore, at least one perpendicular channel and at least one set of steering elements disposed on opposed sides of the tubular body and engaging the at least one perpendicular channel of the tubular body. The at least one perpendicular channel permits the steering elements to move perpendicularly to the axis of the tubular body and restricts movement parallel to the axis of the tubular body. The first and second steering elements are engaged such that movement of the first or second steering element toward an extended position relative to the tubular body moves the other steering element toward a retracted position relative to the tubular body. Actuators are carried by the tubular body that selectively actuate the steering elements toward the extended position to steer the down hole drilling tool.

Abstract: A system includes a valve subassembly configured to be disposed along an internal flowline exit of a first internal flowline within a downhole drilling module. The valve subassembly includes an active valve configured to regulate flow of a fluid through the internal flowline exit and a passive valve configured to be passively controlled based on a differential pressure between a first volume of the downhole drilling module and a second volume surrounding the downhole drilling module.

Abstract: A device for limiting the flow of drilling fluid through a section of drill string includes a body with a hole in the periphery. Flow enters the device through one axial end, at least a portion of the flow exits through the other axial end. Some of the fluid flow can be diverted through the peripheral hole. A spring-biased axial piston has an approximately constant force throughout its range of travel. The piston moves axially in response to the changing fluid flow rate to ensure that a constant amount of flow exiting the axial end of the tool is achieved while diverting away excess flow through the side.

Abstract: A turbine drill motor capable of operation at ultra-high rotary speeds (i.e., in excess of 1000 rpm, which is very high for turbine drill motors), with a high-pressure jet-assist functionality for drilling and well service applications. The ultra-high rotary speed enables fast penetration with diamond bits, while the high-pressure jet-assist ensures adequate cooling and cuttings removal. In an exemplary embodiment, such a turbine drill motor includes a bypass channel to divert a portion of the driving fluid supply when the bit is off-bottom, to limit the no-load runaway speed of the turbine. Serial and parallel flow paths can be accommodated, and different drill bits for cutting and well-bore servicing are disclosed.

Abstract: A valve for communication of a measurement while drilling system includes a first structure having a central portion and one or more elongate portions radially extending from the central portion, and a second structure having one or more portions which substantially bound a central orifice region and one or more elongate orifice regions radially extending from the central orifice region. At least one of the first structure and the second structure is configured to be rotated about a rotation axis to produce a relative rotation between the first structure and the second structure such that a flow path through which mud can flow varies as the at least one of the first structure and the second structure rotates about the rotation axis. The central portion has a maximum inscribed circle encircling the rotation axis and having a first radius and the central orifice region has a maximum inscribed circle encircling the rotation axis and having a second radius greater than the first radius.

Abstract: A down hole apparatus for generating a pulsing action includes a tubular housing a rotating first mandrel with a first cam profile and a reciprocating second mandrel with a second cam profile, which engages the first cam profile. Upon rotational movement of the first mandrel, the first cam profile exerts an axial force upon the second cam profile to initiate a pulsing action by forcing the second mandrel away from the first mandrel. Springs bias the second mandrel back toward the first mandrel, thereby completing the pulsing action and maintaining the second cam profile engaged with the first cam profile.

Abstract: A method of controlling pressure in a well can include transmitting an instruction to change flow through an annulus formed radially between a drill string and a wellbore, and adjusting a pressure setpoint in response to the transmitting. A well drilling system can include a flow control device which varies flow through a drill string, and a control system which changes a pressure setpoint in response to an instruction for the flow control device to change the flow through the drill string. A method of controlling pressure in a well can include transmitting an instruction to divert flow from a drill string, and adjusting a pressure setpoint in response to the transmitting.

Abstract: The present disclosure relates to a drilling apparatus including a cutting unit defining at least one through-hole that provides fluid communication between a distal side and a proximal side of the cutting unit. The cutting unit includes a plurality of cutting elements at the distal side of the cutting unit. The cutting unit also includes a shutter for selectively opening and blocking the through-hole of the cutting unit.

Abstract: A downhole circulation apparatus comprises at least one tubular body portion defining a first through-flow passage through which drilling fluid can pass along the drill string. A first sleeve is slidably mounted in the tubular body portion and is biased into a position in which the first port means is closed by a biasing means such as a spring. Second port means is formed through the tubular body portion at a location below the first port means in the drill string. The second port means may comprise a plurality of second nozzles, wherein each of the second nozzles has a diameter greater than the diameter of each of the first nozzles of the first port means. Larger nozzles enable large particle size drilling fluid to be bypassed. A second sleeve is slidably mounted inside the tubular body portion.

Abstract: A tubular body with an axial bore includes an upper connection attached to a drillstring and a lower connection with a drill bit disposed thereon. Primary and backup cutter blocks are coupled to the tubular body and configured to selectively expand radially therefrom. An activation system within the tubular body is configured to selectively expand and collapse the primary and backup cutter blocks in response to changes in weight applied to the primary and backup cutter blocks.

Abstract: A well drilling system includes a flow control device regulating flow from a rig pump to a drill string, the flow control device being interconnected between the pump and a standpipe manifold, and another flow control device regulating flow through a line in communication with an annulus. Flow is simultaneously permitted through the flow control devices. A method of maintaining a desired bottom hole pressure includes dividing drilling fluid flow between a line in communication with a drill string interior and a line in communication with an annulus; the flow dividing step including permitting flow through a flow control device interconnected between a pump and a standpipe manifold.

Abstract: A well system can include an accumulator in communication with a wellbore, whereby the accumulator applies pressure to the wellbore. A method of maintaining a desired pressure in a wellbore can include applying pressure to the wellbore from an accumulator in response to pressure in the wellbore being less than the desired pressure. Another well system can include a dampener in communication with a wellbore isolated from atmosphere, whereby the dampener mitigates pressure spikes in the wellbore.

Abstract: A downhole tool comprises a body defining a fluid inlet and two or more fluid outlets. A valve arrangement cycles the proportion of fluid directed from the inlet to each of the outlets. One of the outlets may be associated with a fluid pressure responsive device, such as a cleaning blade.

Abstract: A system and method for hydraulic drilling is provided. A whipstock having a bore can be sealingly engaged at a distal end of a workstring. A drilling apparatus having drill tubing and a flow through device for routing drilling fluid into the drill tubing can be connected to the end of a connection string and inserted down into the work string so that the drill tubing extends through the bore in the whipstock device. Pressurized drilling fluid can then be inserted into the annulus formed between the work string and the connection string so that the pressurized drilling fluid passes through the flow through device into the drilling tube and is discharged out the distal end of the drilling tube as a cutting jet.

Abstract: A method of drilling a well and installing a liner includes assembling concentric inner and outer strings of tubulars. A drill bit is located at the lower end of the inner string and a liner with a liner hanger makes up part of the outer string. The inner and outer strings may be rotated in unison to drill the well. A valve is located upstream of a liner hanger control tool used to release and set the liner hanger in the drill string. The valve comprises a ported sleeve that slides relative to a ported housing to meter flow from the interior of the drill string to the annular space. The redirected flow maintains a minimum flow rate in the annular space to prevent cuttings from settling on the control tool. A portion of the valve can further be used with a dart to manipulate downstream equipment.

Abstract: A drill pipe having a tubular body through which is provided a main bore, a side port provided in an exterior surface of the body, a side bore extending through the body from the main bore to the side port, and a valve member which is movable between a closed position in which fluid flow through the side bore is substantially prevented and an open position in which fluid flow through the side bore is permitted, wherein the movement of the valve member between the closed position and the open position comprises translational movement, and the valve member is located at least predominantly within the side bore.

Abstract: A system and method for enabling longitudinal and radial drilling in a wellbore is described. The system and method enable an operator to perforate the casing of a wellbore with an under-reamer at the end of a drill string and, without removing the drill string from the wellbore, initiate and complete lateral jetting of the wellbore into the surrounding formation. The system utilizes a perforation tool having a ball seat, which upon seating a drop ball in the ball seat enables the perforation tool to move from a closed position to an open position thereby allowing access to the formation using a jetting tool. Prior to seating the drop ball, an under-reaming operation may be performed using a hydraulic pressure activated under-reaming tool.

Abstract: A tool for crushing coke includes a casing which in the operational state is connected to a drill rod and on or in which is arranged at least one cutting nozzle and one drill nozzle for drilling coke and at least one valve for controlling a direction of flow of water flowing through the drill rod and the casing through the cutting nozzle and the drill nozzle.

Abstract: A tool for crushing coke includes a casing which in the operational state is connected to a drill rod and on or in which is arranged at least one cutting nozzle and one drill nozzle for drilling coke and at least one valve for controlling a direction of flow of water flowing through the drill rod and the casing through the cutting nozzle and the drill nozzle.

Abstract: What is claimed is a downhole tool string component comprising a generator. The generator may comprise a toroidal stator comprising an interior channel formed between inward extending stator poles. A coil of wire is disposed within the interior channel, and a plurality of magnets are rotatably disposed proximate each pole. A downhole tool string component comprises a bore to receive a flow of drilling fluid comprising a central passage and at least one peripheral passage. A compliant member is disposed within the bore and forms an internal diameter of the central passage, and at least one opening. The at least one opening comprises an internal area within the compliant member to divert the flow of drilling fluid into the at least one peripheral passage. The compliant member comprises a compliant property allowing the internal area of the at least one opening to change thus changing the amount of diverted drilling fluid.

Abstract: A drill bit assembly comprises a bit body intermediate a shank and a working face. The shank is adapted for connection to a drill string. The drill string comprising a fluid passage at least partially disposed within the body. A hammer assembly is movably disposed within the fluid passage along it central axis, the hammer assembly comprises a proximal end stabilized by a centralized upper bearing and a distal end stabilized by centralized a lower bearing. The distal end protrudes out of the working face and the hammer assembly comprises a carrier between the upper and lower bearings. Wherein, under normal drilling operations the carrier is adapted to resist a fluid pressure within the fluid passageway such that the fluid pressure will further extend the distal end of the hammer assembly from the working face by pushing on the carrier.

Abstract: The system and device described relates to flow pulsing for use in down-hole drilling rate of penetration (ROP) enhancement and measurement while drilling (MWD) using a pulse drilling device (PDD) with a fast acting valve in conjunction with a pilot valve to produce high pressure, high amplitude, low duration pressure pulses.