38results about How to "Reduce downside resistance" patented technology

The invention provides a flexible combined oil pump plunger piston, which relates to the technical field of mechanical petroleum mining, in particular to a plunger piston used in an oil pump. The flexible combined oil pump plunger piston comprises an upstream movable valve, wherein the lower end of the upstream movable valve is sequentially connected with at least two sections of small-section sealing bodies, two adjacent sections of small-section sealing bodies are connected through a flexible connector, and the lower end of the small-section sealing body at the lowest end is connected with an upstream movable valve. After the adoption of the flexible connection between all small-section sealing bodies, the mutual rotation, eccentricity regulation and bending (at a small angle) of the small-section sealing bodies can be realized. The invention solves the problems of long rigidity matching surface of the plunger piston and a pump tube, great down operation resistance, severe camber wear of the pump tube and the plunger piston and the like, reduces the friction force formed during the down operation of the plunger piston, improves the sealing reliability of the plunger piston during the up operation, and simultaneously prolongs the effective sealing period.

The invention relates to a packer for formation testing and a method for performing formation testing by adopting the packer. The packer comprises an upper joint, wherein a conical female thread is formed in the upper end of the upper joint, a core pipe extending downwards is screwed in an internal thread in the lower end of the upper joint, and the lower end of the core pipe is inserted into an upper port of a lower joint and is sealed through an O-shaped ring; a conical male thread is formed in the lower end of the lower joint; and a bypass mechanism capable of communicating upper liquid flow and lower liquid flow of the packer is arranged on the periphery of the core pipe and below the upper joint, a setting mechanism is arranged below the bypass mechanism, a shear pin mechanism is arranged below the setting mechanism, and a transposition mechanism for controlling bypass and setting is arranged below the shear pin mechanism. During well descending, the bypass is opened to communicate upper and lower annuluses, after in place, the core pipe is rotated, the bypass is closed, setting is performed, stratum fluid enters a string, then the bypass is opened, unsetting is performed, andthe string is lifted. In the drilling process, it is ensured that the straddle packer cannot be set in advance, so that packer rubber sleeves are effectively protected, and the straddle test successrate is practically increased.

The invention relates to a multi-section centering self-rotating reducer oil pipe pump. An integral oil pump is used as a center pump cylinder. The pump cylinder is provided with an upper joint and a lower joint. A plunger assembly is installed in the pump cylinder and is formed by a reducer plunger unit. The reducer plunger unit at least comprises two stages. The reducer plunger unit of each stage is provided with a self-propelled reducing mechanism and a self-rotating pushing mechanism. The self-propelled reducing mechanism and the self-rotating pushing mechanism are sheathed on the frame of the reducer plunger unit of the corresponding stage. A connecting bearing capable of automatically centering is arranged between two adjacent reducer plunger units. An upper thruster is arranged at the upper end of the plunger assembly. The upper thruster with bolted with a rotator. An anti-collision mechanism is installed at the upper end of the rotator and comprises an anti-collision bar, an anti-collision bar joint and an anti-collision block. A sand scraping cup is sheathed on the external side of the anti-collision bar joint. A sand retainer is sheathed on the external side of the upperend of the anti-collision block. An anti-sand-burying rotating half-ball standing valve assembly is arranged at the lower end of the plunger assembly.

The invention provides a hydraulic self-sealing plunger oil pump, for thoroughly solving the friction problem between sucker rod and oil pipe, comprising plunger, pump barrel and traveling valve, where central rod sieve tube of the plunger is jacketed with a seal elastomer layer, the seal elastomer is jacketed with rigid metal ring and elastic seal ring. In the up-stroke course of the oil pump, the high pressure in the plunger acts through the seal elastomer onto the wearable elastic seal ring to reduce clearance between the seal ring and the pump barrel, strengthening seal and reducing leakage; in the down-stroke course, the pressures at two ends of the plunger are the same, the wearable seal ring contracts, increasing the clearance and reducing down-going resistance of the plunger. And the seal ring structure of the invention is applied to all hydraulic-plunger or multi-plunger pumps, having advantages of reducing the leakage of pump, raising volume of pump and efficiency of pump, etc.

The invention relates to a numerical control winding pumping unit with a sealed steel wire rope. A magnetic powder brake of the numerical control winding pumping unit for the sealed steel wire rope is connected to a motor, a rolling cylinder is fixed onto a cylinder seat, a reduction gearbox output shaft is connected with a rotating shaft of the rolling cylinder through a first chain inclined upwards, and an encoder is mounted on the reduction gearbox output shaft; the sealed steel wire rope is wound on the rolling cylinder, the sealed steel wire rope enters an oil well after passing through a rope guider, a guide mechanism and a well mouth sealing device in sequence, the other end of the sealed steel wire rope is connected with an underground oil extractor, a pressure sensor is fixedly arranged at the upper end of the oil extractor, and the lower end of the oil extractor is connected to a weighing rod; the rope guider is mounted on a rope guiding support, the rotating shaft of the rolling cylinder is connected with a one-way reciprocating lead screw of the rope guider through a second chain inclined upwards, and the sealed steel wire rope is rightly tangential to a rope guiding wheel of the roper guider; and the guide mechanism comprises a plurality of continuous fixed pulleys. The sealed steel wire rope is used, the sealing property reaches up to more than 90%, and a pneumatic swabbing seal box is also matched with the sealed steel wire rope, so that a well mouth is good in sealing property, and the service life of the steel wire rope is long.

This invention discloses a kind of compensated oil pumping centering guide device that is isolated itself. When centering guiding the sucker rod, this invention can compensate and pump oil isolating itself. After clamping baffle ring between the boss of sucker rod and the jointing hook connecting the external screw thread, the centering guiding cover is added. The crescent shaped leather package is nested on the baffle ring. The high anti-friction coating and centering guiding cover at the edge of leather package is used to centering guide and prevent sucker rod abrasion.

The invention relates to a ball valve motion track positioning control type oil-well pump valve assembly, which comprises a valve housing (1) and a valve ball (2), wherein a valve seat (3) is arranged in the valve housing (1); the valve ball (2) is positioned above the valve seat (3); a power valve (4) is arranged in the top center of an inner cavity of the valve housing (1); the lower end surface of the power valve (4) is a semicircle spherical surface and corresponds to the valve ball (2); the power valve (4) and the valve housing (1) can relatively slide; and an elastic part (5) for resetting the power valve (4) is arranged on the power valve (4). The positioning control mechanism prolongs the service life of the valve assembly, keeps a large flow channel to reduce feed liquid flow resistance, accelerates the closing speed of the ball valve to reduce the leakage and improves the pump efficiency.

The invention relates to the technical field of natural gas and oil exploitation, and discloses a position control part and a plunger. When the plunger provided by the embodiment of the invention needs to move downwards, the position control part moves from the expanded position to the retracted position, so that the sealing spacers retract inwards to the position close to the inner position in radial direction, at this moment the maximum outer diameter of the plunger is smaller than the inner diameter of an oil-gas well shaft, friction between the packers and the inner wall of the well shaftis eliminated, a space for fluid to pass through is formed between the plunger and the inner wall of the well shaft, so that downward resistance of the plunger is greatly reduced. In addition, the position control part controls the radial positions of the sealing spacers through position control surfaces on fins, so that flow spaces allowing fluid to pass through can be formed between adjacent fins. When the plunger allows the fluid to pass through a core tube when moving downwards, flow area of the core tube can be increased due to the existence of the flow spaces, so that downward resistanceof the plunger is reduced to a greater extent, and the plunger can move downwards to the bottom of the well more rapidly.

The invention discloses an oil-submersible cable butt joint device used in an oil pipe and an oil-submersible cable butt joint splitting method. The oil-submersible cable butt joint device used in the oil pipe comprises a cable upper connector and a cable lower connector. The cable upper connector comprises a weight bar, a female connector, a snap ring lock sleeve, a snap ring, a female connecting cylinder, a female body, a packing ring and a power connection ring. Three packing rings and three power connection rings are arranged in the female head body, and the three packing rings and the three power connection rings are distributed alternately. The cable lower connector comprises a cable passing oil pipe nipple, a female head locking body, a lock hook, a male head assembly, conducting rings and a fixed base; the number of the conducting rings is three, and the three conducting rings are distributed at intervals in an insulating mode in the vertical direction. The cable upper connector is inserted into the female head locking body of the cable lower connector, so that the locking hook clamps the clamping ring, and the three power connection rings are in one-to-one correspondence contact with the three conductive rings. Damage to the cable is reduced, the operation cost is reduced, and the pump inspection operation efficiency is improved.