48results about How to "Reduce stick-slip" patented technology

The invention relates to a torsional impact drilling tool used for applying low amplitude high frequency torsional impact to a drill bit during a drilling process, which can increase the drilling efficiency and the service life of the drill bit and lesson the tripping operation and the drilling cost. The technical scheme of the torsional impact drilling tool is as follows: a housing is connected with a short section of a drilling column led into the drill bit by a spline, and is positioned by a shaft shoulder; a screw motor rotor and a screw motor stator form a screw motor, the screw motor rotor is eccentrically connected to a transmission shaft by a universal shaft and two bearings, and four diversion holes are arranged on the transmission shaft; the lower end of the transmission shaft is connected with a carrier with a cavity; a sliding impactor is arranged in the cavity and is fixed by pins, and an impact hammer is arranged in the sliding impactor; a falling prevention ring is connected with the housing by screw threads; and the damping shaft shoulder on the short section of the drilling column led into the drill bit is matched with the impact hammer of the sliding impactor to form a ratchet wheel structure. The torsional impact drilling tool has simple structure, and can be used in hard strata of a deep well; and as being short, the tool is also applicable to the deflecting operation and can be used in crooked well holes, thereby reducing the phenomenon of stick-slip of the drill bit and improving the rate of penetration.

The invention discloses a compound vibrating well-drilling tool which comprises a sleeve, a vibrating short joint, a vibrating short joint chuck, a screw motor, a conversion short joint connected with the lower end of the screw motor, an annular disc sleeved at the upper end of the conversion short joint, a hydraulic cylinder installed at the lower end of the conversion short joint, an impact short joint arranged in an inner cavity of the hydraulic cylinder and a torque transmitting short joint, wherein the vibrating short joint, the vibrating short joint chuck, the screw motor, the conversion short joint, the annular disc, the hydraulic cylinder, the impact short joint and the torque transmitting short joint are arranged in sequence from top to bottom. The well-drilling tool can be installed at different positions in a well-drilling column, the drilling column generate axial and circumferential high frequency compound vibration through the tool, and phenomena including 'pulling press' and 'stick slip' in the large-inclination well drilling process are eliminated, thereby remarkably improving mechanical drilling speed, prolonging the service life of a drill bit and reducing well-drilling cost.

The invention relates to a spiral double-stage compounding impacting device for drilling well speed raising and effect enhancing in the fields of oil drilling, geological drilling and the like. The pressure of slurry can be converted into spiral impact of a center pipe. The spiral double-stage compounding impacting device has the technical scheme that an upper joint, an upper casing, a middle joint, a lower casing and a lower joint are sequentially matched through screw threads; a cavity is formed after the fixation; a valve body, a valve body spring, a driving hammer, a center pipe, a disc spring and an impact spray nozzle are sequentially arranged in the cavity from top to bottom; the driving hammer and an inner tube realize the axial positioning through an inner tube spring; through holes are uniformly formed in the peripheral direction; and a spiral bearing groove is formed in the outer surface of the center pipe. According to the tool, the driving hammer is driven to move in the axial direction through slurry pressure; the center pipe is subjected to axial impact; under the joint effects of the driving hammer, the disc spring and a spiral bearing, the center pipe drives the impact spray nozzle to generate the periodic spiral impact on the lower joint, and the impact acts on a lower part drilling tool; the rock breaking efficiency of a drill bit can be effectively improved; the drilling cost is reduced; and meanwhile, the occurrence of a stick-slip phenomenon is reduced.

A muffler for an exhaust system of an internal combustion engine, comprises a housing comprising a shell having an inner wall, an inlet pipe and an outlet pipe, the inlet pipe and the outlet pipe extending into an inner space of the housing, for conveying an exhaust gas stream into and out of the inner space of the housing, at least one baffle arranged in the inner space of the housing, the baffle comprising a baffle plate, the baffle plate having a circumference, and a baffle lip arranged at the circumference of the baffle plate, the baffle lip engaging the inner wall of the shell and having an end portion, wherein the end portion of the baffle lip is curved inwardly away from the inner wall of the shell.

The invention discloses a percussive-rotary drilling tool which is used for providing reciprocating percussion and torque simultaneously during well drilling and can improve drilling efficiency and mechanical drilling rate, and reduce drilling cost. The technical scheme is that: a flow controller is arranged in an upper joint and an automatic valve device below the flow controller is connected with an inner hole of the upper joint through a thread; the automatic valve device, a shell, and an upper end face of a central spindle form a cavity with a variable volume; a flow channel is formed in the middle of the central spindle; a sealing member is arranged between an outer wall of the upper end of the central spindle and an inner wall of the shell; a thread of the lower part of the central spindle is used for connecting a drill bit; and a rotation device is provided with a spiral groove, cylinder followers of the rotation device are arranged on the central spindle, and the bottom of the rotation device is provided with an unidirectional lower pawl surface which is matched with an unidirectional upper pawl surface on the upper part of a bearing joint. The percussive-rotary drilling tool has a simple structure, is suitable for well repairing and drilling operation, and can provide torque and percussion energy, reduce the phenomenon that the drilling bit is sticky and slippery, accelerate mechanical drilling rate, improve drilling efficiency and reduce drilling cost.

The invention relates to a stagnation-prevention drilling tool capable of reducing a stick slip phenomenon through a multi-head helical pair. The stagnation-prevention drilling tool is installed on the upper portion of a drill bit in a thread connection mode and comprises an upper assembly, a vibration absorption assembly and a lower assembly. The rear end of the vibration absorption assembly is provided with an upper connector assembly, and the front end of the vibration absorption assembly is provided with the lower assembly. Vibration generated in the work process of the tool is absorbed through disc springs connected in series, a pressure cavity and a rubber spring. Through matching of a spiral outer shell and a spiral transmission shaft, the multi-head helical pair is formed. When the reaction torque acting on the drill bit is increased and a stick slip or clamping phenomenon occurs, the spiral transmission shaft rotates backwards relative to the spiral outer shell, and therefore small-amplitude reverse rotation is applied to the drill bit. The reaction force of the ground to the drill bit is lowered, stress of the drill bit reaches balance again, and therefore efficient rock breaking with the drill bit is realized. According to the stagnation-prevention drilling tool capable of reducing the stick slip phenomenon through the multi-head helical pair, the vibration generated during rock breaking with the drill bit can be absorbed, the stick slip phenomenon is reduced, and continuous drilling of the drill bit is guaranteed.

The invention discloses an anti-seizing tool capable of avoiding drill clamping and reducing sticky slipping to solve the problem that the rock breaking efficiency is low due to clamping and slipping in the drilling process. According to the main technical scheme, an upper connector, an upper shell, an adapter and a lower shell are sequentially connected through a thread; a compression spring is mounted on a compression spring guide rod, the low end of the compression spring guide rod pushes an anti-falling connector to enable a mandrel to stretch, and the anti-falling connector is connected with a mandrel thread and axially positioned through an adapter shaft shoulder; a steel wire rope system is arranged in a left-rotation mode, the upper and lower ends of the steel wire rope system are separately fixed to the lower end of the adapter and fixed into a circular groove in the upper end of a mandrel boss, the upper and lower ends of steel wire ropes are mounted by 30-40 degrees in an inclined mode, and the steel wire ropes are in a tensional state initially; during work, drilling pressure is transferred to the mandrel through the compression spring, and torque is transferred to the mandrel through the steel wire rope system; and when the mandrel rotates backwards, the steel wire rope system retracts to enable the mandrel to compress the compression spring to axially retract so as to decrease the cutting depth of a drill bit, and the drill bit is in a rock mass in the whole process.

A steering collar for deflecting a drill string in a borehole to cause the borehole to be drilled in a different direction. The steering collar surrounds a hollow drive shaft which is driven by the drill string. During normal drilling operations, the steering collar does not rotate with the drive shaft. The steering collar has three sets of pistons operated by the pressure of the drilling fluid, one set of which is pressure relieved. Drill fluid that is pumped down the drill string flows into the hollow drive shaft and through ports to activate the pistons which thereby force corresponding pads outwardly into contact with the sidewall of the borehole. Since the one set of pistons is pressure relieved, it does not force its pad against the borehole sidewall with as much pressure as the other two sets of pistons force their pads against the sidewall of the borehole. Accordingly, the steering collar is deflected laterally in the borehole so that the drill bit is also steered laterally to cause drilling in a different direction. In order to reorient the steering collar in the borehole, the steering collar can be locked to the drive shaft so that when the drill string is rotated, the steering collar is also rotated so that it is moved to a new angular position in the borehole.

A trim device includes a trim cylinder, a piston, a piston rod and a support member. The piston is slidable inside the trim cylinder, in the axial direction of the trim cylinder. The piston rod is connected with the piston and moves in the axial direction of the trim cylinder following the movement of the piston. The support member is slidable relative to the piston rod and arranged to support the piston rod so that the piston rod's axial center can become tilted with respect to the axial center of the cylinder.

A method for mitigating stick-slip oscillations in borehole equipment while drilling a borehole in an earth formation is described. The borehole equipment is modelled by a computational model for computer simulation. The model has elements representing a particular mechanical and physical behavior of the borehole equipment. In a simulated stick mode of the borehole equipment, physical quantities are loaded to the elements, which quantities represent an initial state of the borehole equipment prior to a transition from stick mode to slip mode. From a simulation of such transition, a time response of rotational speeds of a drive system and bottom hole assembly of the borehole equipment is recorded and a lower limit of the rotational speed of the drive system is determined for which the rotational driven speed of the bottom hole assembly is zero.

The invention discloses an anti-stagnation tool based on flexible rods and belongs to the field of drilling of ultra-deep petroleum wells. By the adoption of the anti-stagnation tool based on the flexible rods, the problem that the rock breaking efficiency is lowered due to the fact that a drill bit gets stuck or slides in the drilling process is solved. According to the main technical scheme, a vibration reduction assembly, an upper shell, a middle shell and a lower shell are connected in sequence through threads; the lower end of a combined disc spring pushes an anti-falling pipe to make a central pipe stretch, and the anti-falling pipe is positioned in the axial direction through an upper connector shaft shoulder of the middle shell; a flexible rod system rotates leftwards, and the upper end and the lower end of the flexible rod system are fixed in circular grooves in the lower end of the middle shell and the upper end of a central pipe boss correspondingly; the flexible rods are installed in the way that the upper ends and the lower ends of the flexible rods are inclined by 30-40 degrees and are in the stretching state initially; during operation, the drilling pressure is transmitted to the central pipe through the combined disc spring, and the torque is transmitted to the central pipe through the flexible rod system; and when the central pipe rotates reversely, the flexible rod system contracts, the combined disc spring is compressed by the central pipe to contract in the axial direction to reduce the cutting depth of the drill bit, and the drill bit is in a rock stratum all the time in the whole process.

The invention relates to a gas phase space rotary swing drilling tool for drilling and a mud guide-out method. The gas phase space rotary swing drilling tool comprises a liquid separation cover, a liquid separation wheel, a turbine, a coupling cylinder, a magnetic coupling rotor, a coupling inner shaft, a pendulum cylinder, pendulums, a backflow joint, an outer cylinder and a lower joint. The gasphase space rotary swing drilling tool is mounted between a drill bit and a drill collar. Mud in a drilling well enters from a mud inlet and is guided and impacts on the turbine through the liquid separation cover and the liquid separation wheel, the turbine rotates rapidly, the magnetic coupling rotor drives the coupling inner shaft to rotate synchronously, and the coupling inner shaft which is connected with the pendulums in the pendulum cylinder transmits rotating force to the pendulums to rotate at high speed, so that drilling mud flows along an annular space between the outer cylinder andthe pendulum cylinder into the backflow joint, flows into the lower joint through a hole of the backflow joint, and is guided into the next part of the drilling tool. The gas phase space rotary swingdrilling tool has the effects that drilling dragging and sticking and slipping are reduced, the drilling efficiency is improved, the jamming accidents of the drilling tool are reduced, and the gas phase space rotary swing drilling tool can be applied to an existing drilling system without modifying the existing drilling system.