53results about How to "Improve the success rate of salvage" patented technology

The invention discloses a hydraulically boosted pulling and running tool for a capillary pipe of a large-inclination water injection well. The hydraulically boosted pulling and running tool comprises a salvaging body, a hydraulic boosting mechanism, a hydraulic power-increasing mechanism and a salvaging claw mechanism installed at the lower end of the salvaging body. The hydraulic boosting mechanism in the hydraulically boosted pulling and running tool is mainly designed for solving the problem that a pulling and running instrument is difficult to go down at an inclined well section, downward power is provided for the instrument at the inclined well section by utilizing throttling pressure difference produced by overflowing of the gap between a packing cup and an oil pipe to prevent the instrument from being impeded in the midway and ensure that the instrument goes down to a predetermined position. The hydraulic power-increasing mechanism in the hydraulically boosted pulling and running tool is mainly designed for avoiding the phenomenon that a water distributor core is easily stuck with a working barrel during salvaging at the inclined well section and comprises a slip power-increasing mechanism and a two-stage piston power-increasing mechanism, and it is ensured that the core is smoothly taken out of the working barrel by increasing an anchoring force and an upward power of the pulling and running instrument at the inclined well section. The problem that the pulling and running instrument is difficult to go down and is small in salvaging powder during upgoing at the inclined well section is solved in a hydraulic mode.

The invention discloses a top well cementation method and device for a self-communicated double-process screen pipe, and the top well cementation method and device are suitable for a top well cementation and completion process of a screen pipe of an oil-gas well. The method comprises the following steps: connecting an intermediate casing (1), a screen pipe (3), a casing (2), a self-communicated screen pipe top well cementation device (4), a screen pipe (5), an upper external packer (6), a lower external packer (7) and a pickling circulation valve (8) as designed; lowering to a well along with a casing string; circulating mud at an interval in the process of lowering the casing; throwing balls for keeping the pressure after putting in place to expand and seal a lower rubber barrel (4.5) and an upper rubber barrel (4.6) of a packer of the self-communicated screen pipe top well cementation device (4); keeping the pressure for opening the well cementation hole (4.12) of the self-communicated screen pipe top well cementation device (4); circularly performing well cementation; generating colliding pressure; continuing to keep the temperature; releasing the pressure; lowering a fishing spear to fish out a self-communicated inner pipe (4.0) of the self-communicated screen pipe top well cementation device (4); communicating the screen pipe (3) with the inside of the casing (1), so that the top well cementation and completion process of the screen pipe (3) is finished. According to the method, the mud can be circulated after the casing is lowered to the well, so that the risk of hole-wall collapsing and resistance meeting is lowered; the casing is communicated with the screen pipe after the colliding pressure is generated, so that the piston effect is removed and the success rate of fishing is increased.

The invention provides a drilling tool salvaging device and method. The drilling tool salvaging device comprises a thread making cone, a guiding piece and a hooked piece; the guiding piece comprises ahollow body and a guiding part for guiding a drilling tool, one end of the body is connected with the thread making cone, and the other end of the body is connected with the hooked piece; and the guiding part is located at the end, away from the thread making cone, of the body so as to be matched with the hooked piece to right the drilling tool. According to the drilling tool salvaging device, the hooked piece is mounted on the side, away from the thread making cone, of the body of the guiding piece, meanwhile, the guiding part is arranged at the end, away from the thread making cone, of thebody, when the fish top of the salvaged drilling tool is located on the large belly part of a drill hole or tightly attached to the well wall, the drilling tool is hooked through the hooked piece of the drilling tool salvaging device to move so as to leave from the large belly part or the well wall, then under the cooperation guiding effect of the guiding part, the drilling tool is righted and smoothly enters the body of the guiding piece and the thread making cone, thus the drilling tool is conveniently subjected to thread making through the thread making cone and taken out from the drill hole, and the salvaging success rate is increased.

The invention relates to the technical field of oil exploitation, in particular to a downhole operation fishing tool. The downhole operation fishing tool comprises a shell, a first power mechanism, stabilizing mechanisms, a second power mechanism, a first grabbing mechanism and a second grabbing mechanism, wherein the first power mechanism, the second power mechanism and the second grabbing mechanism are sequentially arranged in the shell, the stabilizing mechanisms are arranged on the two sides outside the shell, and the first grabbing mechanism is installed at the position close to the bottom of the shell. According to the scheme, through the power mechanisms, the stabilizing mechanisms and the grabbing mechanisms, the underground stability and fishing diversity of the fishing tool are improved, the requirement for fishing work in different oil wells is met, the fishing efficiency is improved, and the use cost is reduced.

The invention discloses a universal type drilling tool fisher and a fishing method thereof. The universal type drilling tool fisher includes an outer pipe, a reducing connecting pipe and a sleeve, anannular lead piston capable of axial movement, an inner pipe with a water leading hole in the side wall, and a hollow piston rod capable of axial movement successively and coaxially sleeve the interior of the outer pipe from outside to inside, end covers with water inlet passages are arranged at the end of the hollow piston rod and the end of the annular lead piston, the tail of the hollow pistonrod is connected with a coaxial core rod, the end of the core rod is the enlarged end, an elastic clamping jaw sleeves the exterior of the core rod, and the clamping jaw end of the elastic clamping jaw is arranged around the enlarged end of the core rod. The universal type drilling tool fisher is used for quick salvage of drilling tool breaking or falling and other accidents in the process of drilling, quick and reliable connection between the fisher and a broken drilling tool is realized by clamping the inner wall of the drilling tool through the elastic clamping jaw and locking the core rodthrough a limiting bead, and secondary falling of the drilling tool in the salvage process is avoided; and the function of unclamping is further achieved, if the situation in a hole is complex, the fisher can be quickly separated from the broken drilling tool to prevent the accident from worsening, and the loss is reduced.

The invention relates to a tool set for changing a downhole damaged casing and cementing. The tool set comprises a hydraulic internal cutter, a downhole junk fishing tool, a remaining casing milling tool and an external insertion butt joint cementing tool, an external insertion guiding shoe is arranged at the lower end of the external insertion butt joint cementing tool, an extension cylinder is rotatably connected at the upper end of the external insertion guiding shoe, a circulating cylinder is rotatably connected at the upper end of the extension cylinder, a plurality of rows of ash injection holes are arranged on the peripheral wall on the middle section of the circulating cylinder, a sealing cylinder is rotatably connected at the upper end of the circulating cylinder, an R-shaped sealring is embedded at the upper part of a female thread at the lower end of the sealing cylinder, a barb faces upwards, a butt joint is rotatably connected in the female thread at the upper end of thesealing cylinder, a conical female thread is arranged at the upper end of the butt joint, an inner chamfer of the butt joint is arranged on a lower port of the butt joint, the upper part of the innerchamfer is narrow, and the lower part of the inner chamfer is wide; and the inner diameters of the sealing cylinder, the circulating cylinder, the extension cylinder and the external insertion guidingshoe are adaptive to the outer diameter of the casing. The tool set for changing the downhole damaged casing and cementing is simple in structure and is convenient to operate, the production cost andthe downhole risk are low, the operations of butt jointing and setting are simple, and the sealing reliability is high.

The invention relates to a variable bent joint, and belongs to the technical field of an auxiliary fishing tool for a petroleum and natural gas well. The variable bent joint comprises an outer tube, a directional joint, a piston, an upper joint and a lower joint, wherein one end of the outer tube is provided with the upper joint through screw threads; the piston is arranged in the outer tube positioned at one side of the upper joint through a piston ring; the other end of the outer tube is provided with an upper ball seat through screw threads; and a cam is arranged in the outer tube positioned between the upper ball seat and the piston through a cam seat and a cam pin. In the use process of the variable bent joint, the bent corner action can be done, so that the problems that the existing tool can only be used for fishing fallen objects in a straight well or in the axial line direction of a well body and has a small use range and the problems of low repeated use rate and high cost of the existing fishing tool are solved. The variable bent joint has the advantages that the strength is high; greater pulling force, pressure and twisting force can be borne; the application range is wide; the variable bent joint can be matched with a drilling jar to be used; meanwhile, the back-off operation can be realized; and positive popularization significance is realized.

The invention discloses a fishing device and method of a downhole HDPE (High-Density Polyethylene) well pipe of a brine well. The fishing device is formed by combining a drill rod and a fisher, wherein the fisher is movably connected with the drill rod, the two ends of the fisher can be clamped or penetrated into the inner wall of the fished well pipe, and a connecting fulcrum is arranged at the eccentric position of a plate of the fisher; a wedge-shaped guide head is arranged at the bottom end of the drill rod. The fishing method is described as follows: the drilling rod is connected with a drilling machine, the drilling machine is started, and the fishing device is placed into the well pipe by virtue of guiding of the wedge-shaped guide head, and the fisher contacts or rubs the wall of the well to rotate to a certain angle when the fishing device is placed into the well pipe, so that the fishing device can be placed into the well pipe in a way that the fisher closely clings to the well pipe; the drilling rod is lifted upwards, and fishing pulling force is transmitted to the fisher, so that the fished well pipe is clamped or jammed by the fisher; the drilling rod is lifted upwards continuously, the fished well pipe and the fisher are lifted at the same time, the action is continued, and the fished well pipe is fished out of the brine well finally. The fishing device has high success rate of fishing and can be smoothly placed into the well, and the fished well pipe can be successfully clamped or jammed by the fisher of the fishing device, so that the well pipe is fished smoothly.

The invention belongs to the technical field of oil field borehole operation fishing tools, and particularly relates to a full-size fishing spear for pipe drops in an oil-water well and a fishing method thereof. The full-size fishing spear comprises a connector, a first level spear rod, a second level spear rod and a third level spear rod; and the connector, the first level spear rod, the second level spear rod and the third level spear rod are sequentially connected from top to bottom. of the three levels of spear rods of different sizes are combined, and the fishing range is Phi 46 mm-65 mm,and is obviously greater than that of Phi of 59 mm-65 mm of a common sliding block fishing spear. The spear rods of the sliding block fishing spears with different diameters are connected together bythreads from small to large, so that the fishing range is greater, and the spear rods are adapted according to the size of the inner diameters of the drops; and compared with the common sliding blockfishing spear, the contact area of a sliding block slip and the oil pipe wall is increased by about one time, so that the pressure on an oil pipe is effectively reduced, and the rupture risk of the wall of the oil pipe to be fished is reduced.

The invention relates to a hydraulic retractable fishing spear for a horizontal well. The hydraulic retractable fishing spear for the horizontal well comprises an upper connector, a sleeve, a centralpipe, an upper piston cylinder, a lower piston cylinder, a fishing claw and a spear rod; one end of the sleeve is fixedly connected with the outer wall of one end of the upper connector, one end of the central pipe is fixedly connected with the inner wall of one end of the upper connector, and the upper piston cylinder and the lower piston cylinder are fixedly connected in a sleeved mode and forma lower liquid inlet groove from the inner wall of the lower piston cylinder to the interior of the lower piston cylinder, the lower liquid inlet groove can push the lower piston cylinder and the upper piston cylinder to slide simultaneously under action of pressure, the other end of the lower piston cylinder is connected with the fishing claw, slip inserts are formed at the tail end of the fishing claw, one end of the spear rod is fixedly connected with the center pipe and one end of the spear rod is sleeved with a spring, and when the lower piston cylinder drives the fishing claw to move inthe axial direction of the spear rod, the spring is compressed or stretched; the hydraulic retractable fishing spear for a horizontal well also comprises an inner sliding sleeve, and the inner slidingsleeve is arranged inside the center pipe in a sleeving manner and can block the lower liquid inlet groove. According to the hydraulic retractable fishing spear for the horizontal well, a conventional upward-lifting and downward-placing rotary quitting mode of the fishing spear is changed into a hydraulic quitting mode, and the limitation of a horizontal well body structure is overcome.

The invention discloses an oil pipe litter fishing device which comprises a base. The bottom end of a support is connected with the upper surface of the base. The upper end of the support is connected with a pulley. One end of a metal hose is wound around the pulley, and the other end of the metal hose is connected with an electromagnetic disc. A baffle is arranged at the upper end of an electromagnetic suction cup. An LED illumination lamp and a camera are arranged on the lower surface of the baffle. N metal bars are arranged on a magnetic conduction face plate of a battery suction cup. The upper ends of the N metal bars are all hinged to the upper end of the battery suction cup. The lower ends of the N metal bars are connected with the magnetic conduction face plate of the battery suction cup through springs respectively. Barbs are arranged on the surfaces of the metal bars. The fishing device has the technical advantages of being reasonable in design, beneficial to fishing, free of consumption of a large amount of manpower, and high in fishing efficiency and success rate.

The invention discloses a restriction choke rubber sleeve deliquescent agent dropping device which is designed for achieving smooth salvage of the restriction choke. The upper end of a connector of the device is connected with a steel wire; the lower end is connected with the sleeve body and sealed by an axial sealing ring. The upper portion of the wall of the sleeve body is provided with an injection screw hole which is connected with a nut and sealed by a rubber sealing ring. The inner wall at the bottom end of the sleeve body is stepped and connected with a bottom cap which is fixed by a radial pin inserted in the step; and the bottom cap is sealed by a sealing ring. A spring is arranged inside the sleeve body; the upper end of the spring is connected with the bottom surface of the connector, the lower end is connected with the bottom cap. The device can closely contact with the restriction chock, effectively dissolve the rubber sleeve, avoid waste of the deliquescent agent, and increase the salvage efficiency and success rate. The device is simple in structure, convenient in construction, safe and environment-friendly.

The invention discloses an opening-closing type salvaging device for dilled pipe drill bits. A housing is a thin-wall cylindrical tapered barrel; a limiting rod passes through from a housing; an upper limiting bolt and a lower limiting bolt are welded on the limiting rod; four rod outlet windows are vertically formed in the side wall of the housing; two connecting rods are separately welded horizontally in two vertical inside centers of the rod outlet windows; guide slide sleeves are hinged between the two connecting rods in the rod outlet windows by taking the side wall as the center; a limiting slide sleeve is arranged between the upper limiting bolt and the lower limiting bolt of the limiting rod; movable rods are connected to the limiting slide sleeve in a manner of enabling a fixing rod to pass through a horizontal hole; the four movable rods on the limiting slide sleeve separately pass through four guide slide sleeves in corresponding directions to get out from the housing. The limiting slide sleeve upwards slides along the limiting rod, the movable rods are opened and the limiting slide sleeve downwards slides along the limiting rod, so that the movable rods are closed. The device realizes multi-angle all-around salvaging work for multiple drill bits in drilled holes and karst caves, and has great significance on improving the technical level of pile foundation construction.

The invention discloses a fishing cup for a large-size fallen object. The fishing cup for the large-size fallen object is characterized in that an inclined spray nozzle is formed in a water hole portion of a lower cup rod of a cup body, and a fan-shaped cup opening and a cup horseshoe-shaped opening are formed in the cup body; the fishing cup is connected with a drilling tool entering a well before the fallen object is fished, before the drilling tool drills the bottom of the well, the fishing cup is made to move downwards gradually, sand settled at the bottom of the well is flushed, after the tool reaches the bottom of the well, the fishing kelly-down is checked, the cycle displacement is set to be large, a rotating disk is rotated intermittently, a large amount of slurry flushes the fallen object at the bottom of the well frontwards through the water hole and the inclined spray nozzle at the moment, and the fallen object is turned upwards from the fan-shaped cup opening; when the fallen object passes through the fan-shaped cup opening, due to the sudden increase of the area of an annular space and the decrease of the flow speed, the fallen object begins to drop; when the dropping fallen object is just aligned with the cup body, the fallen object enters the cup body or when the dropping fallen object is in contact with the cup horseshoe-shaped opening rotating intermittently along with the rotating disk, the fallen object is stirred to move towards the center of the cup body, and the fallen object smoothly enters the cup body to be fished through the support of a well wall.

The invention discloses a drilling bit capable of being abandoned under stuck and buried conditions. The drilling bit comprises a vertically arranged drilling bit body and an outer cylinder. The outercylinder sleeves the drilling bit body. A locking nut cap is arranged between the top of the drilling bit body and the outer cylinder. A plurality of transmission torque slots are formed in the bottom of the outer cylinder; a plurality of transmission torque blocks are arranged at the middle part of the drilling bit body; and the transmission torque blocks and the transmission torque slots are connected cooperatively in a one-to-one correspondence manner. An external thread A is arranged at the top of the drilling bit body; and the locking nut cap is in threaded connection with the external thread A and the outer cylinder is compressed on the drilling bit body. According to the invention, the great-value rotating guiding drilling system is guaranteed by abandoning a low-value drilling bitunder the extreme condition that the drilling tubular column can not be taken out, so that the too high economic losses are avoided; and the salvage success rate is increased.

The invention relates to a sealable tail tube unsealing and salvaging tool. The sealable tail tube unsealing and salvaging tool comprises an upper joint, an outer sleeve, an unsealing pin, a spring shaft base, a spring sleeve and a sealing tail tube, wherein the upper joint is connected with the upper end of the outer sleeve through a threaded structure, and is sealed by an O-shaped sealing ring;the outer sleeve is fixedly connected with the spring shaft base through the unsealing pin and is sealed by an O-shaped sealing ring; the lower end of the outer sleeve is connected with the spring sleeve through a threaded structure; a spring and a sectioning salvaging claw are arranged between the spring sleeve and the spring shaft base; the spring sleeve is connected with the upper end of the sectioning salvaging claw through inner and outer shoulders; the lower end of the sectioning salvaging claw sleeves the outer circle of the upper end of the sealing tail tube; the upper end of the sealing tail tube is connected with the lower end of the spring shaft base through a threaded structure; and two O-shaped sealing rings are arranged at the outer circle of the lower end of the sealing tailtube. The sealable tail tube unsealing and salvaging tool can seal a central tube, so that the inner part of the oil tube can bear pressure, also has a return function, can avoid salvaging operation,is reasonable in structural design, is simple and convenient in operation, is safe and reliable, and is high in salvaging success rate.