Casing, pumping and drifting integrated tool

Abstract

The utility model discloses a casing pumping and drifting integrated tool which comprises an oil bailing swab, an anti-falling device is connected below the oil bailing swab, a weighting rod is connected below the anti-falling device, the lower end of the weighting rod is connected with a drifting tool, and the anti-falling device comprises an anti-falling device upper connector, an anti-falling device shell and an anti-falling device lower connector. Double lugs at the upper end of the anti-falling device upper connector are hinged to a single lug at the lower end of the oil bailing puller through a high-strength pin shaft, the lower end of the anti-falling device upper connector is connected to an upper port of the anti-falling device shell in a screwed mode, a center column is arranged at the upper end of the anti-falling device lower connector and inserted into a center hole in the bottom wall of the anti-falling device shell, and the upper end of the center column is connected with an anti-falling device nut in a screwed mode. The bottom of the anti-disengaging device nut is supported on the bottom wall of the anti-disengaging device shell through a thrust bearing. By means of the tool, the number of times of well lifting and descending can be reduced, a pipe column smoothly passes through a blocked section and then directly enters for oil fishing, meanwhile, the steel wire rope can be prevented from being abraded due to twisting and entanglement, and therefore the fault that a puller and the drifting tool fall into a well in the drifting process is completely eradicated.

Description

Technical Field

[0001] The utility model relates to a downhole operation tool, in particular to an integrated tool for casing pumping and hole cleaning, belonging to the technical field of oil recovery tools. Background Art

[0002] In the later stage of oilfield exploitation, the oil production volume decreases, and mechanical oil production by pumping units is unsustainable. At this time, oil recovery operations are usually adopted, changing from relying on mechanical oil production by pumping units to relying on a winch to "fish" oil. After the crude oil liquid level recovers within a certain cycle time in the oil well, an oil recovery sucker is lowered into the well, and the oil well is pumped intermittently.

[0003] The process principle of mobile pumping and oil recovery is as follows: With the help of special equipment, the oil recovery tool is lowered into the well. When the sucker is lowered to a certain depth below the liquid level, the wire rope is lifted. Under the action of the liquid column pressure, the rubber of the sucker slides towards the lower part of the central pipe and expands, producing a sealing effect with the wall of the tubing (or casing), and the liquid above the sucker is sealed. When the sucker is lifted to the ground, the liquid is discharged into the tanker through a high-pressure pipeline, completing one oil recovery process.

[0004] During the oil recovery production process, there are often situations where the oil recovery sucker cannot be lowered normally due to downhole abnormalities, blockages, etc. The currently commonly used solution is to connect a tubing to the lower part of the sucker and rely on the self-weight of the tubing to dredge and remove the condensed oil part. This method has very poor effects for wells with high gum and mud content. The main problems are as follows:

[0005] 1. When the oil is thick and the gum content is high, the sucker connected to the tubing still cannot be lowered normally. According to the traditional process, hole cleaning needs to be carried out separately, increasing the workload and prolonging the shutdown time;

[0006] 2. When the resistance is severe, the wire rope is lifted and lowered multiple times, causing the sucker to repeatedly lift and probe. When the lower end of the sucker encounters resistance, the wire rope above it becomes slack and is prone to twisting, wearing at places such as the rope socket, resulting in premature breakage, and causing the sucker and the downhole hole cleaning tool below to fall into the well;

[0007] 3. If the weight of the hole cleaning tool is too light, it cannot pass through the blocked section. If it is too heavy, it is easy to cause the clutch of the drum for winding the wire rope on the ground to slip. Summary of the Utility Model

[0008] The purpose of this part is to outline some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this part as well as in the abstract and the title of the application of this application, but such simplifications or omissions cannot be used to limit the scope of the utility model.

[0009] In view of the above and / or problems existing in the prior art, the present utility model is proposed.

[0010] The purpose of the present utility model is to provide an integrated tool for casing pumping and well flushing, which connects a rotatable well flushing tool below the oil pumping swab, reduces the number of trips for well completion, enables the well flushing string to smoothly enter the oil pumping after passing through the blocked section of the oil pumping well, and can avoid the wear of the wire rope due to twisting and entanglement, thereby preventing the failure of the swab and the well flushing tool from falling into the well during the well flushing process.

[0011] To solve the above technical problems, the integrated tool for casing pumping and well flushing of the present utility model includes an oil pumping swab, a release preventer is connected below the oil pumping swab, a weight rod is connected below the release preventer, a well flushing tool is connected to the lower end of the weight rod, the release preventer includes an upper joint of the release preventer, a housing of the release preventer and a lower joint of the release preventer, the upper end of the upper joint of the release preventer is hinged to the lower single ear of the oil pumping swab through a high-strength pin shaft, the lower end of the upper joint of the release preventer is screwed into the upper port of the housing of the release preventer, a central column is provided at the upper end of the lower joint of the release preventer, the central column is inserted through the central hole in the bottom wall of the housing of the release preventer and an anti-release nut is screwed at the upper end, and the bottom of the anti-release nut is supported on the bottom wall of the housing of the release preventer through a thrust bearing.

[0012] Furthermore, the weight rod includes an upper coupling of the weight rod and an outer cylinder of the weight rod, the upper port of the upper coupling of the weight rod is screwed to the lower end of the lower joint of the release preventer, the upper end of the outer cylinder of the weight rod is screwed into the lower port of the upper coupling of the weight rod, retaining plates are respectively welded to the upper and lower cross-sections at both ends of the outer cylinder of the weight rod, and a lead body is cast between the upper and lower retaining plates.

[0013] Furthermore, the well flushing tool includes a well flushing pipe coupling and a well flushing pipe, the upper port of the well flushing pipe coupling is screwed to the lower end of the outer cylinder of the weight rod, the upper end of the well flushing pipe is screwed into the lower port of the well flushing pipe coupling, a long groove of the well flushing pipe extending axially is provided on the circumferential wall of the middle section of the well flushing pipe, and a plurality of well flushing pointed teeth are uniformly provided on the circumference of the lower port of the well flushing pipe.

[0014] Furthermore, through radial lifting holes are respectively provided at both ends of the outer cylinder of the weight rod.

[0015] Furthermore, the oil pumping swab includes an oil pumping central pipe, a large rubber cylinder assembly matching the large casing is sleeved on the outer periphery of the oil pumping central pipe, a centralizer joint is screwed to the upper end of the oil pumping central pipe, a centralizer wear-resistant rubber sleeve is embedded in the central hole of the centralizer joint, a sealing seat is screwed to the lower end of the oil pumping central pipe, a throat is provided in the middle section of the central hole of the sealing seat, a sealing seat wear-resistant rubber sleeve is provided at the throat, and a downwardly tapered inner conical sealing surface is provided below the throat, and a plurality of axially through flow channels are uniformly provided on the outer periphery of the sealing seat.

[0016] Further, a steel wire rope passes through the centralizing wear-resistant rubber sleeve, the oil fishing central pipe, and the wear-resistant rubber sleeve of the sealing seat. The lower end of the steel wire rope passes through the central hole of the sealing head and is fixed in the rope cap. A small casing swab assembly matching the small casing is connected to the lower end of the rope cap. An outer conical sealing surface is provided at the upper end of the sealing head, and the outer conical sealing surface cooperates with the inner conical sealing surface.

[0017] Further, the centralizing wear-resistant rubber sleeves are symmetrically installed at the upper and lower ends of the central hole of the centralizing joint.

[0018] Further, the centralizing wear-resistant rubber sleeve and the wear-resistant rubber sleeve of the sealing seat are respectively provided with slits along the entire length direction.

[0019] Further, an inner step is provided in the middle of the central hole of the centralizing joint. The bottom of the upper centralizing wear-resistant rubber sleeve is supported above the inner step of the central hole of the centralizing joint. A centralizing compression cap is screwed into the upper port of the centralizing joint, and the bottom of the centralizing compression cap presses on the top of the upper centralizing wear-resistant rubber sleeve.

[0020] Further, the top of the lower centralizing wear-resistant rubber sleeve is supported below the inner step of the central hole of the centralizing joint, and the bottom of the lower centralizing wear-resistant rubber sleeve abuts against the top of the oil fishing central pipe.

[0021] Further, a plurality of oil fishing central pipe long grooves extending vertically are symmetrically provided on the circumference of the middle section of the oil fishing central pipe.

[0022] Further, the large rubber cylinder assembly includes a rubber cylinder bushing, an upper rubber cylinder compression cap, a large rubber cylinder, and a lower rubber cylinder compression cap. The rubber cylinder bushing is sleeved on the outer circumference of the oil fishing central pipe. The large rubber cylinder is sleeved on the outer circumference of the rubber cylinder bushing. A plurality of bushing through holes communicating with the oil fishing central pipe long grooves are symmetrically provided on the circumference of the middle section of the rubber cylinder bushing. The lower end of the large rubber cylinder is embedded in the lower rubber cylinder compression cap, and the lower rubber cylinder compression cap is screwed to the lower end of the rubber cylinder bushing. An outer flange is provided at the upper end of the rubber cylinder bushing. The upper end outer circumference of the large rubber cylinder is embedded in the upper rubber cylinder compression cap, and the top of the upper rubber cylinder compression cap abuts against the lower part of the outer step at the upper end of the rubber cylinder bushing.

[0023] Compared with the prior art, the utility model has achieved the following beneficial effects: 1. The device realizes the safe connection between the swab and the well flushing tool during the well flushing process of the oil fishing well, and solves the problem that the well flushing tool cannot pass through the heavy oil section.

[0024] 2. The device is equipped with a solid weight rod to transform the lower structure of the well flushing tool, realizing the safe operation of the well flushing tool; enabling the well flushing tool to smoothly pass through the heavy oil section. Once encountering resistance, it can overflow through the central groove. In case of gum, oil sludge, etc., it can be broken by the bottom sharp corners and taken out of the wellbore, ultimately achieving the purpose of well flushing and oil fishing.

[0025] 3. The upper part of the anti-disconnection device can rotate relative to the well unblocking tool below. When the well unblocking pipe encounters resistance when inserted into the oily sludge, the swab above can rotate through the anti-disconnection device to release the twist, avoiding excessive twisting and knotting of the wire rope, resulting in excessive wear, and preventing the tool from falling into the well.

[0026] 4. The circumferential wall of the well unblocking pipe is provided with a long groove, which is convenient for inserting tools through the long groove to poke out the colloidal oily sludge in the pipe.

[0027] 5. The wire rope is prevented from being eccentric in the tool and from wearing against metal components. The swab has good sealing performance, and the crude oil pumped to the upper part of the large rubber barrel can be smoothly discharged from the oil production liquid outlet at the lower part of the blowout preventer pipe, with a low leakage rate.

[0028] 6. A centralizer joint is connected to the upper end of the oil production central pipe, and a centralizer wear-resistant rubber sleeve is installed in the central hole of the centralizer joint. The wire rope is located in the upper and lower centralizer wear-resistant rubber sleeves and the wear-resistant rubber sleeve of the sealing seat, preventing eccentricity in the tool and wear against metal components. Description of the Drawings

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings. The drawings are only for reference and explanation, and are not used to limit the present invention. Among them:

[0030] Figure 1 It is a cross-sectional view of the integrated tool for casing pumping and well unblocking of the present invention;

[0031] Figure 2 It is a structural schematic diagram of the anti-disconnection device in the present invention;

[0032] Figure 3 It is an enlarged view of the upper joint of the anti-disconnection device in the anti-disconnection device;

[0033] Figure 4 It is an enlarged view of the weight rod in the present invention;

[0034] Figure 5 It is an enlarged view of the well unblocking tool in the present invention;

[0035] Figure 6 It is a structural schematic diagram of the oil production swab in the present invention;

[0036] In the figure: A. oil extraction pump; 1. straightening pressure cap; 2. straightening joint; 3. straightening wear-resistant rubber sleeve; 4. oil extraction center tube; 4a. long groove of oil extraction center tube; 5. large rubber tube assembly; 5a. rubber tube bushing; 5a1. bushing through hole; 5b. rubber tube upper pressure cap; 5c. large rubber tube; 5d. rubber tube lower pressure cap; 6. sealing seat; 7. sealing seat wear-resistant rubber sleeve; 8. sealing pad; 9. flow channel; 10. sealing head; 11. O-ring; 12. rope cap; 13. small casing extraction assembly; 14. wire rope;

[0037] B. Anti-slip device; 15. High-strength pin shaft; 16. Anti-slip device upper joint; 17. Anti-slip device housing; 18. Anti-slip device nut; 19. Thrust bearing; 20. Anti-slip device lower joint;

[0038] C. Weighting rod; 21. Upper coupling of weighting rod; 22. Outer tube of weighting rod; 23. Lead body; 24. Radial lifting hole; 25. Blocking plate;

[0039] D. Well-draining tools; 26. Well-draining pipe coupling; 27. Well-draining pipe; 28. Well-draining pipe long groove; 29. ​​Well-draining sharp teeth. DETAILED DESCRIPTION

[0040] In the following description of the utility model, the terms "upper", "lower", "front", "back", "left", "right", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the utility model and simplifying the description, and do not mean that the device must have a specific direction.

[0041] In order to make the technical means, creative features, objectives and effects of the present invention easier to understand, the present invention is further described below with reference to specific figures. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0043] like Figures 1 to 5 As shown, the integrated casing pumping and well clearing tool of the utility model comprises an oil scavenging pump A, an anti-slip device B, a weighted rod C and a well clearing tool D, wherein the anti-slip device B is connected below the oil scavenging pump A, the weighted rod C is connected below the anti-slip device B, and the well clearing tool D is connected to the lower end of the weighted rod C.

[0044] The anti - dropout device B includes an upper joint 16 of the anti - dropout device, a housing 17 of the anti - dropout device, and a lower joint 20 of the anti - dropout device. The upper double - ears at the upper end of the upper joint 16 of the anti - dropout device are hinged to the lower single - ear of the oil - pumping bailer A through a high - strength pin 15. The lower end of the upper joint 16 of the anti - dropout device is screwed into the upper port of the housing 17 of the anti - dropout device. The upper end of the lower joint 20 of the anti - dropout device is provided with a central column. The central column is inserted through the central hole in the bottom wall of the housing 17 of the anti - dropout device, and an anti - dropout nut 18 is screwed onto the upper end. The bottom of the anti - dropout nut 18 is supported on the bottom wall of the housing 17 of the anti - dropout device through a thrust bearing 19, suspending the lower joint 20 of the anti - dropout device and the weight rod C and the well - unblocking tool D below it.

[0045] Four counterbores are symmetrically arranged on the upper end face of the anti - dropout nut 18, which is convenient for inserting short rods to rotate the anti - dropout nut 18 to adjust its screwing position, so as to keep the appropriate clearance of the thrust bearing 19 and enable the upper joint 16 of the anti - dropout device to rotate flexibly relative to the lower joint 20 of the anti - dropout device.

[0046] The weight rod C includes an upper collar 21 of the weight rod and an outer cylinder 22 of the weight rod. The upper port of the upper collar 21 of the weight rod is screwed to the lower end of the lower joint 20 of the anti - dropout device. Flap discs 25 are respectively welded to the upper and lower cross - sections at both ends of the outer cylinder 22 of the weight rod. A lead body 23 is cast between the upper and lower flap discs. Radial loading and lifting holes 24 that penetrate through are respectively provided at both ends of the outer cylinder 22 of the weight rod, which is convenient for inserting steel pipes to carry the weight rod. First, weld a steel pipe that penetrates along the diameter at the position of the radial loading and lifting holes 24, and the central hole of the steel pipe serves as the radial loading and lifting holes 24; then weld the bottom flap disc 25, and then pour lead into the outer cylinder 22 of the weight rod. After the lead body 23 is poured, weld the upper flap disc 25. The upper end of the outer cylinder 22 of the weight rod is screwed into the lower port of the upper collar 21 of the weight rod, reducing pin hinge and lowering the risk of falling off.

[0047] The well - unblocking tool D includes a well - unblocking pipe collar 26 and a well - unblocking pipe 27. The upper port of the well - unblocking pipe collar 26 is screwed to the lower end of the outer cylinder 22 of the weight rod. The upper end of the well - unblocking pipe 27 is screwed into the lower port of the well - unblocking pipe collar 26. A long slot 28 of the well - unblocking pipe that extends axially is provided on the circumferential wall of the middle section of the well - unblocking pipe 27. A plurality of well - unblocking pointed teeth 29 are evenly arranged on the circumference of the lower port of the well - unblocking pipe 27.

[0048] When the well - unblocking tool D reaches the blocked section, the well - unblocking pointed teeth 29 move downward along the inner wall of the oil pipe, poking off the adhered gum - like sludge. The pointed teeth can increase the local pressure, and with the weight increase of the weight rod C, it is convenient to smoothly pass through the heavy - oil section, saving the well - unblocking time and safely achieving the purpose of well - unblocking and oil pumping. The peeled gum - like sludge enters the inner cavity of the well - unblocking pipe 27 for collection. After crossing the blocked section, there is no need to lift the well - unblocking tool D out of the wellhead, reducing the number of trips up and down. Directly continue to probe downward, enabling the oil - pumping bailer A to enter the oil layer for pumping.

[0049] If it fails to pass through the blocked section smoothly at one time, the tool can be lifted to a certain height and then released downward again. By repeatedly impacting in this way, it can pass through the blocked section smoothly and then enter the normal pumping operation. After the pumping is completed and the whole tool is lifted out of the ground, since the colloidal sludge is embedded in the deep cavity of the well unblocking pipe 27, it is very difficult to clean. This tool is provided with a long groove 28 for the well unblocking pipe on the circumferential wall of the well unblocking pipe 27. The long groove 28 for the well unblocking pipe can be provided with only one, or symmetrically provided with two or more, or alternately changed in phase along the height direction. In this way, a hard object can be inserted on the ground to poke out the sludge in the inner cavity, reducing the cleaning time.

[0050] During the process of the tool entering the well, due to being scraped by the inner wall of the oil pipe, it is easy to rotate, causing the wire rope suspending the oil fishing pump A to have a twist. During the normal process of entering the well, due to the weight of the tool and the weight of the weight rod C, the wire rope remains in a taut state.

[0051] When the well unblocking teeth 29 at the lower port of the well unblocking pipe are blocked when inserted into the colloidal sludge, the well unblocking tool D decelerates and descends, causing the wire rope to become slack. If the twist cannot be released, the wire rope is prone to twisting and entanglement. Under the action of the anti-disengagement device B in this tool, during the whole process of the tool entering the well, the well unblocking tool D, the weight rod C and the lower joint 20 of the anti-disengagement device can rotate relative to the upper joint 16 of the anti-disengagement device and the above components, and timely release the twist of the wire rope.

[0052] When the well unblocking tool D, the weight rod C and the lower joint 20 of the anti-disengagement device are blocked, under the action of the thrust bearing 19, the upper joint 16 of the anti-disengagement device can still rotate to release the twist of the wire rope, avoiding the wire rope from twisting and entanglement, keeping it in a straight state, so that the wire rope and the metal parts are worn, and avoiding the accident of the tool falling into the well.

[0053] As Figure 6 shown, the oil fishing pump A includes a centralizing compression cap 1, a centralizing joint 2, an oil fishing central pipe 4, a large rubber cylinder assembly 5, a sealing seat 6, a wear-resistant rubber sleeve 7 for the sealing seat, a sealing head 10, a rope cap 12 and a small casing pump assembly 13. A large rubber cylinder assembly 5 matching the large casing is sleeved on the outer periphery of the oil fishing central pipe 4. The upper end of the oil fishing central pipe 4 is screwed with a centralizing joint 2. A centralizing wear-resistant rubber sleeve 3 is embedded in the central hole of the centralizing joint 2. The lower end of the oil fishing central pipe 4 is screwed with a sealing seat 6. A throat is provided in the middle section of the central hole of the sealing seat 6. A wear-resistant rubber sleeve 7 for the sealing seat is provided at the throat. An inner conical sealing surface that gradually expands downward is provided below the throat. A plurality of axially penetrating flow channels 9 are uniformly provided on the outer periphery of the sealing seat 6;

[0054] The wire rope 14 passes through the centralizer wear-resistant rubber sleeve 3, the oil fishing central pipe 4 and the sealing seat wear-resistant rubber sleeve 7. The lower end of the wire rope 14 passes through the central hole of the sealing head 10 and is fixed in the rope cap 12. A small casing swab assembly 13 matching the small casing is connected to the lower end of the rope cap 12. The upper end of the sealing head 10 is provided with an outer conical sealing surface, which is matched with the inner conical sealing surface.

[0055] The upper and lower ends of the central hole of the centralizer joint are symmetrically installed with centralizer wear-resistant rubber sleeves 3, and their shapes and sizes are the same for easy interchange. The upper ends of the upper centralizer wear-resistant rubber sleeves are respectively provided with flared mouths with enlarged diameters, and the lower ports of the lower centralizer wear-resistant rubber sleeves are provided with flared mouths with enlarged diameters, which are convenient for the wire rope 14 to pass through.

[0056] Both centralizer wear-resistant rubber sleeves 3 are provided with slits along the entire length direction, which are convenient for installation or disassembly from the slits for replacement.

[0057] The middle part of the central hole of the centralizer joint is provided with an inner step. The bottom of the upper centralizer wear-resistant rubber sleeve is supported above the inner step of the central hole of the centralizer joint. The upper port of the centralizer joint 2 is screwed with a centralizer compression cap 1, and the bottom of the centralizer compression cap 1 presses on the top of the upper centralizer wear-resistant rubber sleeve.

[0058] The top of the lower centralizer wear-resistant rubber sleeve is supported below the inner step of the central hole of the centralizer joint, and the bottom of the lower centralizer wear-resistant rubber sleeve abuts against the top of the oil fishing central pipe 4.

[0059] The large rubber barrel assembly 5 includes a rubber barrel bushing 5a, a rubber barrel upper compression cap 5b, a large rubber barrel 5c and a rubber barrel lower compression cap 5d. The rubber barrel bushing 5a is sleeved on the outer periphery of the oil fishing central pipe 4, the large rubber barrel 5c is sleeved on the outer periphery of the rubber barrel bushing 5a. The middle section of the rubber barrel bushing 5a is symmetrically provided with a plurality of bushing through holes 5a1 in the circumferential direction. The lower end of the large rubber barrel 5c is embedded in the rubber barrel lower compression cap 5d, and the rubber barrel lower compression cap 5d is screwed on the lower end of the rubber barrel bushing 5a. The upper end of the rubber barrel bushing 5a is provided with an outer flange, and the upper outer periphery of the large rubber barrel 5c is embedded in the rubber barrel upper compression cap 5b, and the top of the rubber barrel upper compression cap 5b abuts against the lower part of the upper outer step of the rubber barrel bushing 5a. The outer periphery of the upper outer flange of the rubber barrel bushing 5a is provided with a hexagonal head, which is convenient for adjusting the pre-compression amount of the large rubber barrel 5c.

[0060] The middle section of the oil fishing central pipe 4 is symmetrically provided with a plurality of oil fishing central pipe long grooves 4a extending vertically, which are communicated with the bushing through holes 5a1. When the large rubber barrel assembly 5 moves upward, the crude oil above applies pressure to the inner wall of the large rubber barrel 5c through the oil fishing central pipe long grooves 4a and the bushing through holes 5a1, so that the large rubber barrel 5c expands outwards to realize the seal with the inner wall of the large casing. The crude oil pumped to the upper part of the large rubber barrel 5c is blocked by the large rubber barrel 5c and pushed upward until it reaches the wellhead.

[0061] A sealing gasket 8 is provided at the inner step of the root of the inner cone sealing surface of the sealing seat 6. When the steel wire 14 lifts the small sleeve puller assembly 13 up along the small sleeve to combine with the large sleeve puller, the sealing head 10 is embedded in the lower end of the sealing seat 6, and the top of the sealing head 10 is pressed under the sealing gasket 8, forming the first seal of the central channel.

[0062] The sealing gasket 8 can be embedded in the root of the inner cone sealing surface by interference fit, or can be bonded to the root of the inner cone sealing surface, or a diameter expansion burr can be provided on the upper part of the sealing gasket 8, and the diameter expansion burr is embedded in the annular embedding groove at the root of the inner cone sealing surface to prevent the sealing gasket 8 from falling during the well entry process. The annular embedding groove can be a cutter groove at the root of the inner cone sealing surface.

[0063] An O-ring 11 is embedded in the upper part of the outer cone sealing surface of the upper end of the sealing head 10, and the outer cone sealing surface of the sealing head 10 fits with the inner cone sealing surface of the sealing seat 6, and the second seal is achieved through the O-ring 11 to prevent the crude oil above from leaking downward along the central channel.

[0064] The upper end of the seal seat wear-resistant rubber sleeve 7 is provided with an expanded bell mouth for easy insertion of the wire rope 14. The seal seat wear-resistant rubber sleeve 7 is provided with a slit along the entire length direction for easy replacement. The seal seat wear-resistant rubber sleeve 7 has the same shape and size as the two straightening wear-resistant rubber sleeves 3 and can be used interchangeably.

[0065] The assembly process of the oil pump A is as follows:

[0066] The first step is to install the seal seat wear-resistant rubber sleeve 7 on the upper part of the center hole of the seal seat 6, install the sealing gasket 8 on the lower inner step of the seal seat 6, and then install the oil recovery center pipe 4;

[0067] Step 2: Assemble the straightening joint 2, install the upper and lower straightening wear-resistant rubber sleeves 3 in the center hole of the straightening joint, and tighten the straightening pressure cap 1 at the upper end of the straightening joint 2;

[0068] The third step is to sleeve the large rubber cylinder assembly 5 on the outer periphery of the oil recovery center tube 4, and then screw the lower end of the oil recovery center tube 4 to the sealing seat 6. At this point, the installation of the split movable large sleeve drawer is completed;

[0069] Step 4: Pass the steel wire rope 14 through the center holes of the straightening pressure cap 1, the straightening joint 2, the straightening wear-resistant rubber sleeve 3, the oil scavenging center pipe 4, the sealing seat 6 and the sealing seat wear-resistant rubber sleeve 7;

[0070] Step 5: The lower end of the wire rope 14 continues to pass through the central hole of the sealing head 10 and is connected to the rope cap 12. After the connection is firm, the sealing head 10 is connected to the upper end of the rope cap 12; the upper end periphery of the sealing head 10 is a conical shape with a narrow upper portion and a wide lower portion, and an O-ring 11 is embedded in the upper periphery of the cone;

[0071] Step 6: Connect the single ear at the lower end of the rope cap 12 to the small sleeve drawer assembly 13;

[0072] Step 7: Connect the anti-drop device B, the weight rod C and the well-drilling tool D to the single ear below the small casing puller assembly 13, and the assembly is completed.

[0073] The oil recovery process is as follows:

[0074] The vertical derrick and other safety operation procedures are in place. After the oil pump A is lowered from the wellhead, when the tool is lowered to the diameter change of the large and small casings, the upper part of the split movable large casing pump is left at the diameter change, and the small casing pump assembly 13 continues to be lowered to the liquid level required by the regulations, and the wire rope 14 is lifted. When the small casing pump assembly 13 reaches the diameter change, the sealing head 10 above the rope cap 12 enters the inner cone surface of the lower part of the sealing seat 6. The lifting force generated by the weight of the crude oil and the acceleration presses the sealing gasket 8 against the inner step of the sealing seat 6, and the O-ring 11 presses against the inner cone surface of the lower part of the sealing seat 6, forming a double seal to prevent the upper crude oil from leaking back to the well.

[0075] At the same time, the gravity and acceleration force of the crude oil act on the large rubber cylinder assembly 5, and the rubber expands under the force and sticks to the inner wall of the large casing, thereby pumping the crude oil into the ground tank truck.

[0076] The puller tool remaining in the large casing stops moving at the diameter change point, and the lower small casing puller assembly 13 is lowered with the wire rope 14, and the wire rope 14 will produce friction on the inner wall of the upper large casing puller. The tool is equipped with a straightening wear-resistant rubber sleeve 3 in the center hole of the straightening joint 2 to protect the tool and the wire rope 14.

[0077] During the working process, the straightening wear-resistant rubber sleeve 3 is checked and replaced if it is severely worn. The size and structure of the upper and lower straightening wear-resistant rubber sleeves 3 are consistent, and the size and structure are consistent with the sealing seat wear-resistant rubber sleeve 7. First, it has strong versatility and reduces loss cost and manufacturing cost. Second, there is an "installation seam" in the middle. After wear, the gap can be enlarged and the sleeve can be installed.

[0078] The cooperation between the sealing head 10 and the sealing seat 6, and the double sealing principle and structural design of the sealing gasket 8 and the O-ring 11 ensure that the crude oil leakage is very small.

[0079] The small rubber cylinder in the middle of the small casing drawer assembly 13 is sealed with the inner wall of the small casing, and the crude oil above the small rubber cylinder is pumped upward. When the crude oil reaches the top of the reducer, it goes up along the flow channel 9 into the flow channel 9 on the outer periphery of the sealing seat 6. At this time, the large rubber cylinder 5c is in a relaxed state, and the crude oil reaches the top of the large rubber cylinder 5c. When the small casing drawer assembly 13 approaches the reducer of the large and small casings, the speed is appropriately increased to enable the sealing head 10 above the rope cap 12 to quickly enter the inner cone surface of the lower part of the sealing seat 6 to achieve sealing.

[0080] After the small casing swab assembly 13 is combined with the large casing swab, they are pulled upward together under the traction of the wire rope 14. The gravity and acceleration force of the crude oil act on the large rubber cylinder assembly 5, causing the large rubber cylinder 5c to expand under force and tightly adhere to the inner wall of the large casing, thereby pumping the crude oil out of the wellhead.

[0081] The above are only the preferred and feasible embodiments of the present invention, which show and describe the basic principles, main features and advantages of the present invention. The patent protection scope of the present invention is not limited thereby. Those skilled in the art should understand that the present invention is not limited by the above embodiments. Except for the above embodiments, without departing from the spirit and scope of the present invention, the present invention can also have other implementation manners. The present invention will also have various changes and improvements. Any technical solutions formed by equivalent replacement or equivalent transformation fall within the protection scope required by the present invention. The protection scope required by the present invention is defined by the appended claims and their equivalents. The technical features not described in the present invention can be realized by or adopted from the prior art, and will not be elaborated herein.

Claims

1. An integrated tool for casing pumping and hole cleaning, including an oil fishing pump, characterized in that, A fishing pump is connected with a release preventer below it. The release preventer is connected with a weight rod below it. The lower end of the weight rod is connected with a hole cleaning tool. The release preventer includes an upper joint of the release preventer, a housing of the release preventer and a lower joint of the release preventer. The upper end of the upper joint of the release preventer is provided with double ears which are hinged with the single ear at the lower end of the fishing pump through a high-strength pin shaft. The lower end of the upper joint of the release preventer is screwed into the upper port of the housing of the release preventer. The upper end of the lower joint of the release preventer is provided with a central column which is inserted through the central hole in the bottom wall of the housing of the release preventer and is screwed with a release preventer nut at the upper end. The bottom of the release preventer nut is supported on the bottom wall of the housing of the release preventer through a thrust bearing.

2. The integrated swabbing and hole opening tool according to claim 1, wherein: The weight rod includes an upper coupling of the weight rod and an outer cylinder of the weight rod. The upper port of the upper coupling of the weight rod is screwed with the lower end of the lower joint of the release preventer. The upper end of the outer cylinder of the weight rod is screwed into the lower port of the upper coupling of the weight rod. The cross sections at the upper and lower ends of the outer cylinder of the weight rod are respectively welded with retaining plates, and a lead body is cast between the upper and lower retaining plates.

3. The integrated tool for casing pumping and hole cleaning according to claim 2, wherein: The hole cleaning tool includes a hole cleaning pipe coupling and a hole cleaning pipe. The upper port of the hole cleaning pipe coupling is screwed with the lower end of the outer cylinder of the weight rod. The upper end of the hole cleaning pipe is screwed into the lower port of the hole cleaning pipe coupling. A hole cleaning pipe long groove extending axially is arranged on the circumferential wall in the middle section of the hole cleaning pipe. A plurality of hole cleaning pointed teeth are uniformly arranged on the circumference of the lower port of the hole cleaning pipe.

4. The integrated swabbing and hole opening tool according to claim 2, characterized in that: Penetrating radial lifting holes are respectively arranged at both ends of the outer cylinder of the weight rod.

5. The integrated tool for casing fishing and hole cleaning according to claim 1, wherein: The fishing pump includes a fishing central pipe. A large rubber cylinder assembly matching with a large casing is sleeved on the outer periphery of the fishing central pipe. A centralizing joint is screwed at the upper end of the fishing central pipe. A centralizing wear-resistant rubber sleeve is embedded in the central hole of the centralizing joint. A sealing seat is screwed at the lower end of the fishing central pipe. A throat is arranged in the middle section of the central hole of the sealing seat. A sealing seat wear-resistant rubber sleeve is arranged at the throat. An inner conical sealing surface which gradually expands downward is arranged below the throat. A plurality of axially penetrating flow channels are uniformly arranged on the outer periphery of the sealing seat.

6. The integrated fishing and hole-opening tool according to claim 5, characterized in that: A steel wire rope passes through the centralizing wear-resistant rubber sleeve, the fishing central pipe and the sealing seat wear-resistant rubber sleeve. The lower end of the steel wire rope passes through the central hole of the sealing head and is fixed in a rope cap. The lower end of the rope cap is connected with a small casing pump assembly matching with a small casing. An outer conical sealing surface is arranged at the upper end of the sealing head, and the outer conical sealing surface is matched with the inner conical sealing surface.

7. The integrated tool for casing pumping and hole straightening according to claim 6, characterized in that: The centralizing wear-resistant rubber sleeves are symmetrically embedded at the upper and lower ends of the central hole of the centralizing joint.

8. The integrated tool for casing pumping and hole cleaning according to claim 7, characterized in that: The centralizing wear-resistant rubber sleeve and the sealing seat wear-resistant rubber sleeve are respectively provided with slits along the whole length direction.

9. The integrated tool for casing pumping and hole straightening according to claim 7, wherein: An inner step is arranged in the middle of the central hole of the centralizing joint. The bottom of the upper centralizing wear-resistant rubber sleeve is supported above the inner step in the central hole of the centralizing joint. A centralizing compression cap is screwed in the upper port of the centralizing joint, and the bottom of the centralizing compression cap presses on the top of the upper centralizing wear-resistant rubber sleeve.

10. The integrated tool for casing pumping and hole straightening according to claim 7, characterized in that: The top of the lower centralizing wear-resistant rubber sleeve is supported below the inner step in the central hole of the centralizing joint, and the bottom of the lower centralizing wear-resistant rubber sleeve abuts against the top of the fishing central pipe.

11. The integrated swabbing and hole-opening tool according to claim 6, wherein: A plurality of vertically extending fishing central pipe long grooves are symmetrically arranged on the circumference of the middle section of the fishing central pipe.

12. The integrated fishing and reaming tool according to claim 11, wherein: The large rubber barrel assembly includes a rubber barrel bushing, an upper rubber barrel pressing cap, a large rubber barrel, and a lower rubber barrel pressing cap. The rubber barrel bushing is sleeved on the outer periphery of the oil fishing central pipe. The large rubber barrel is sleeved on the outer periphery of the rubber barrel bushing. A plurality of bushing through holes communicating with the long grooves of the oil fishing central pipe are symmetrically arranged on the circumference of the middle section of the rubber barrel bushing. The lower end of the large rubber barrel is embedded in the lower rubber barrel pressing cap, and the lower rubber barrel pressing cap is screwed to the lower end of the rubber barrel bushing. An outer flange is provided at the upper end of the rubber barrel bushing. The outer periphery of the upper end of the large rubber barrel is embedded in the upper rubber barrel pressing cap, and the top of the upper rubber barrel pressing cap abuts against the lower part of the outer step at the upper end of the rubber barrel bushing.

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