Anti-eccentric-wear split reducing oil bailing tool

Abstract

The utility model discloses an anti-eccentric-wear split type reducing oil bailing tool, which is characterized in that a large rubber sleeve assembly matched with a large sleeve is sleeved on the periphery of a central pipe, a centralizing joint is screwed at the upper end of the central pipe, a centralizing wear-resistant rubber sleeve is embedded in a central hole of the centralizing joint, a sealing seat is screwed at the lower end of the central pipe, and the sealing seat is sleeved on the central pipe. A throat is formed in the middle section of a center hole of the sealing seat, a sealing seat wear-resisting rubber sleeve is arranged at the throat, an inner cone sealing face gradually expanding downwards is arranged below the throat, and a plurality of axially-through flow channels are evenly formed in the periphery of the sealing seat. A steel wire rope penetrates through the centralizing wear-resistant rubber sleeve, the central pipe and the sealing seat wear-resistant rubber sleeve, the lower end of the steel wire rope penetrates through a central hole of the sealing head and is fixed in a rope socket, and the lower end of the rope socket is connected with a small sleeve puller assembly matched with a small sleeve; an outer cone sealing face is arranged at the upper end of the sealing head and matched with the inner cone sealing face. The tool can reduce the abrasion of the steel wire rope, enhance the sealing function, reduce the leakage of swabbed liquid and reduce underground faults.

Description

Technical Field

[0001] The utility model relates to an anti-eccentric wear split type different-diameter oil scavenging tool, belonging to the technical field of oil scavenging tools. Background Art

[0002] In the later stages of oilfield production, if casing damage or other factors render the original well inoperable, drilling additional or new wells can significantly increase production costs. This involves running a small casing (also known as a liner) into the original well casing, or creating a window in the original well casing and drilling a new hole sideways. For example, a 139.7mm casing has an inner diameter of 124mm, a hanger has an inner diameter of 86.5mm, and a liner has an outer diameter of 95mm and an inner diameter of 82mm. This allows the use of existing surface infrastructure, reducing construction costs and ensuring stable and increased oilfield production. After the liner is lowered and lowered into the original well casing or new wellbore to the desired depth, the upper end of the liner is set in the original well casing using the liner hanger. Once set, cement slurry is injected into the liner annulus to cement the well.

[0003] In the later stage of tail pipe production, the oil output 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 mechanical "recovery" of oil by oil recovery winches. After the crude oil level in the oil well recovers within a certain period of time, the oil recovery unit is lowered and the oil well is intermittently pumped.

[0004] The principle of mobile oil recovery is as follows: Using specialized equipment, the recovery tool is lowered into the well. When the pump reaches a certain depth below the liquid surface, the wire rope is pulled up. The pump's rubber, under the pressure of the liquid column, slides down the central pipe and expands, creating a seal with the tubing (or casing) wall, sealing the liquid above the pump. When the pump reaches the surface, the liquid is discharged into a tank truck via a high-pressure pipeline, completing the oil recovery process.

[0005] Conventional oil recovery tools are only suitable for oil wells with uniform production pipe diameters. However, for oil wells with a small diameter lower production casing and a large diameter upper casing, the crude oil in the small casing cannot be recovered.

[0006] The Chinese invention patent with publication number CN 1306144C discloses a split-type variable-diameter oil test pump, which comprises, from bottom to top, a salvage device, an oil inlet lower joint, a center pipe, an upper joint, a weighting rod, a conical body, a wire rope joint, and a support tube. A conical body with a conical surface is provided between the weighting rod and the wire rope joint. A support tube is sleeved on the wire rope, and an upper rubber tube is provided outside the support tube. A through hole is provided on the support tube wall on the inner side of the upper rubber tube. The outer diameter of the upper rubber tube is larger than the outer diameter of the rubber tube. Upper tube pressure seats are provided on the upper and lower sides of the upper rubber tube. An upper oil outlet is provided on the support tube above the upper rubber tube. A conical surface is provided on the inner side of the lower end face of the support tube. The conical surface on the support tube cooperates with the conical surface on the conical body. It is not only suitable for oil testing in equal-diameter casing or oil pipes, but also suitable for oil testing in variable-diameter casing or oil pipes.

[0007] This technical solution has the following problems: 1. Complex structure and high manufacturing cost; 2. High failure rate under working conditions during actual use; 3. Poor three-point straightening effect of the wire rope, with frequent rope wear and jamming; 4. Large amount of oil leakage during pumping, and insufficient success rate in actual application. Utility Model Content

[0008] The purpose of this section is to summarize some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and in the abstract and title of the utility model to avoid obscuring the purpose of this section, the abstract and the title of the utility model, and such simplifications or omissions shall not be used to limit the scope of the present invention.

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

[0010] The purpose of the utility model is to overcome the problems existing in the prior art and provide an anti-eccentric wear split-type different-diameter oil recovery tool, which reduces the wear of the wire rope during the up and down movement, enhances the sealing function, reduces the leakage of the pumping fluid, and reduces downhole failures.

[0011] In order to solve the above technical problems, the utility model provides an anti-eccentric wear split-type reducing oil recovery tool, comprising a center tube, the outer periphery of the center tube is sheathed with a large rubber cylinder assembly matching the large casing, the upper end of the center tube is screwed with a central joint, the center hole of the central joint is embedded with a centralizing wear-resistant rubber sleeve, the lower end of the center tube is screwed with a sealing seat, the middle section of the center hole of the sealing seat is provided with a throat, the throat is provided with a sealing seat wear-resistant rubber sleeve, the lower part of the throat is provided with an inner conical sealing surface that gradually expands downward, and the outer periphery of the sealing seat is evenly provided with a plurality of axially penetrating flow channels;

[0012] The steel wire rope passes through the straightening wear-resistant rubber sleeve, the center tube and the sealing seat wear-resistant rubber sleeve. The lower end of the steel wire rope passes through the center hole of the sealing head and is fixed in the rope cap. The lower end of the rope cap is connected to a small sleeve puller assembly that matches the small sleeve. The upper end of the sealing head is provided with an outer cone sealing surface, and the outer cone sealing surface cooperates with the inner cone sealing surface.

[0013] Furthermore, the centralizing wear-resistant rubber sleeves are symmetrically embedded at the upper and lower ends of the central hole of the centralizing joint.

[0014] Furthermore, the straightening wear-resistant rubber sleeve and the sealing seat wear-resistant rubber sleeve are respectively provided with slits along the entire length direction.

[0015] Furthermore, an inner step is provided in the middle of the center hole of the straightening joint, and the bottom of the upper straightening wear-resistant rubber sleeve is supported above the inner step of the center hole of the straightening joint. A straightening pressure cap is screwed into the upper port of the straightening joint, and the bottom of the straightening pressure cap is pressed on the top of the upper straightening wear-resistant rubber sleeve.

[0016] Furthermore, the top of the lower centralizing wear-resistant rubber sleeve is supported below the step in the central hole of the centralizing joint, and the bottom of the lower centralizing wear-resistant rubber sleeve rests against the top of the central pipe.

[0017] Furthermore, a plurality of vertically extending central tube long grooves are symmetrically provided on the middle section of the central tube.

[0018] Furthermore, the large rubber cylinder assembly includes a rubber cylinder bushing, a rubber cylinder upper pressure cap, a large rubber cylinder and a rubber cylinder lower pressure cap. The rubber cylinder bushing is sleeved on the outer periphery of the center tube, and the large rubber cylinder is sleeved on the outer periphery of the rubber cylinder bushing. The middle section of the rubber cylinder bushing is symmetrically provided with a plurality of bushing through holes that are connected with the long groove of the center tube. The lower end of the large rubber cylinder is embedded in the rubber cylinder lower pressure cap, and the rubber cylinder lower pressure cap is screwed onto the lower end of the rubber cylinder bushing; the upper end of the rubber cylinder bushing is provided with an outer flange, the outer periphery of the upper end of the large rubber cylinder is embedded in the rubber cylinder upper pressure cap, and the top of the rubber cylinder upper pressure cap rests on the bottom of the upper outer step of the rubber cylinder bushing.

[0019] Furthermore, a hexagonal head is provided on the outer periphery of the upper end outer flange of the rubber cylinder bushing.

[0020] Furthermore, an O-ring is embedded in the upper portion of the outer cone sealing surface at the upper end of the sealing head.

[0021] Furthermore, a sealing gasket is provided at the inner step of the root of the inner cone sealing surface of the sealing seat.

[0022] Furthermore, a diameter-expanding burr is provided on the upper portion of the sealing gasket, and the diameter-expanding burr is embedded in the annular embedding groove at the root of the inner cone sealing surface.

[0023] Furthermore, the upper ends of the sealing seat wear-resistant rubber sleeve and the upper centering wear-resistant rubber sleeve are respectively provided with expanded diameter bell mouths, and the lower end of the lower centering wear-resistant rubber sleeve is provided with an expanded diameter bell mouth.

[0024] Furthermore, the sealing seat wear-resistant rubber sleeve and the centralizing wear-resistant rubber sleeve have the same shape and size.

[0025] Furthermore, a single ear is provided at the lower end of the small sleeve puller assembly, and a weighting rod is hung below the single ear.

[0026] Furthermore, the upper end of the large casing is connected to the bottom of the wellhead four-way, and the wire rope shear well sealer, blowout preventer, blowout preventer and blowout preventer box are installed in sequence above the wellhead four-way. The upper end of the wire rope passes through the central channel of the blowout preventer box, blowout preventer, blowout preventer, wire rope shear well sealer and wellhead four-way in sequence and extends downward into the well.

[0027] Compared with the existing technology, the utility model has achieved the following beneficial effects: 1. It can smoothly carry out oil recovery operations in multiple oil wells with different pipe diameters, with low design cost, simple structure and convenient operation; it is basically compatible with the currently widely used oil recovery tools for oil wells with the same diameter casing, and most of the existing accessories are universal;

[0028] 2. Connect the central tube to the upper end of the center pipe, and install the centralizing wear-resistant rubber sleeve in the center hole of the centralizing joint. The wire rope is located in the upper and lower centralizing wear-resistant rubber sleeves and the sealing seat wear-resistant rubber sleeve to avoid eccentricity in the tool and avoid wear with metal components;

[0029] 3. The upper and lower straightening wear-resistant rubber sleeves are the same in size and shape as the sealing seat wear-resistant rubber sleeves, so they can be interchanged and replaced easily after wear.

[0030] 4. The sealing performance is good. The crude oil pumped to the top of the large rubber cylinder can be smoothly discharged from the oil outlet at the bottom of the blowout preventer, and the leakage rate is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work. The drawings are only provided for reference and explanation, and are not intended to limit the present invention. Among them:

[0032] Figure 1 This is a front view of the utility model anti-eccentric wear split type different diameter oil recovery tool;

[0033] Figure 2 for Figure 1 Enlarged view of the large and medium rubber cylinder assembly;

[0034] Figure 3 This is a working state diagram of the utility model anti-eccentric wear split type different diameter oil bailing tool;

[0035] In the figure: 1. Centralizing pressure cap; 2. Centralizing joint; 3. Centralizing wear-resistant rubber sleeve; 4. Center tube; 4a. Center tube long groove; 5. Large rubber cylinder assembly; 5a. Rubber cylinder bushing; 5a1. Bushing through hole; 5b. Rubber cylinder upper pressure cap; 5c. Large rubber cylinder; 5d. Rubber cylinder lower pressure cap; 6. Sealing seat; 7. Sealing seat wear-resistant rubber sleeve; 8. Sealing gasket; 9. Flow channel; 10. Sealing head; 11. O-ring; 12. Rope cap; 13. Small casing puller assembly; 14. Wire rope; 15. BOP box; 15a. Pressure joint; 16. Reducer; 17. BOP; 18. Oil bailing outlet; 19. BOP; 20. Wire rope shear well sealer; 21. Wellhead spool; 22. Weighting rod. DETAILED DESCRIPTION

[0036] In the following description of the present invention, 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 present invention and simplifying the description, and do not mean that the device must have a specific direction.

[0037] 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 embodiments described are only a part of the present invention, not all of the embodiments.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the art of the present invention. The terms used herein 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.

[0039] like Figure 1 、 Figure 2 As shown, the utility model anti-eccentric wear split type reducing oil recovery tool includes a straightening pressure cap 1, a straightening joint 2, a center tube 4, a large rubber cylinder assembly 5, a sealing seat 6, a sealing seat wear-resistant rubber sleeve 7, a sealing head 10, a rope cap 12 and a small sleeve puller assembly 13. The outer periphery of the center tube 4 is sleeved with a large rubber cylinder assembly 5 matching the large sleeve, the upper end of the center tube 4 is screwed with the straightening joint 2, the center hole of the straightening joint 2 is embedded with the straightening wear-resistant rubber sleeve 3, the lower end of the center tube 4 is screwed with the sealing seat 6, the middle section of the center hole of the sealing seat 6 is provided with a throat, the throat is provided with a sealing seat wear-resistant rubber sleeve 7, the lower part of the throat is provided with an inner cone sealing surface that gradually expands downward, and the outer periphery of the sealing seat 6 is evenly provided with a plurality of axial through-flow channels 9;

[0040] The steel wire rope 14 passes through the straightening wear-resistant rubber sleeve 3, the center tube 4 and the sealing seat wear-resistant rubber sleeve 7. The lower end of the steel wire rope 14 passes through the center hole of the sealing head 10 and is fixed in the rope cap 12. The lower end of the rope cap 12 is connected to a small sleeve puller assembly 13 that matches the small sleeve; the upper end of the sealing head 10 is provided with an outer cone sealing surface, which cooperates with the inner cone sealing surface.

[0041] The center hole of the central joint is symmetrically fitted with centralizing wear-resistant rubber sleeves 3 at both ends, with the same shape and size for easy interchangeability. The upper end of the upper centralizing wear-resistant rubber sleeve is provided with an expanded bell mouth, and the lower end of the lower centralizing wear-resistant rubber sleeve is provided with an expanded bell mouth to facilitate the passage of the wire rope 14.

[0042] The two centralizing wear-resistant rubber sleeves 3 are respectively provided with slits along the entire length direction, which is convenient for installation or removal from the slits to complete replacement.

[0043] An inner step is provided in the middle of the center hole of the straightening joint, and the bottom of the upper straightening wear-resistant rubber sleeve is supported above the inner step of the center hole of the straightening joint. A straightening pressure cap 1 is screwed into the upper port of the straightening joint 2, and the bottom of the straightening pressure cap 1 is pressed on the top of the upper straightening wear-resistant rubber sleeve.

[0044] The top of the lower centralizing wear-resistant rubber sleeve is supported below the step in the central hole of the centralizing joint, and the bottom of the lower centralizing wear-resistant rubber sleeve is against the top of the central pipe 4.

[0045] The large rubber cartridge assembly 5 includes a rubber cartridge bushing 5a, a rubber cartridge upper pressure cap 5b, a large rubber cartridge 5c, and a rubber cartridge lower pressure cap 5d. The rubber cartridge bushing 5a is fitted around the outer circumference of the center tube 4, while the large rubber cartridge 5c is fitted around the outer circumference of the rubber cartridge bushing 5a. The midsection of the rubber cartridge bushing 5a is symmetrically provided with multiple bushing holes 5a1. The lower end of the large rubber cartridge 5c is embedded in the rubber cartridge lower pressure cap 5d, which is screwed onto the lower end of the rubber cartridge bushing 5a. The upper end of the rubber cartridge bushing 5a is provided with an outer flange, and the outer circumference of the upper end of the large rubber cartridge 5c is embedded in the rubber cartridge upper pressure cap 5b. The top of the rubber cartridge upper pressure cap 5b rests below the outer step at the upper end of the rubber cartridge bushing 5a. A hexagonal head is provided on the outer circumference of the upper end outer flange of the rubber cartridge bushing 5a to facilitate adjustment of the pre-compression of the large rubber cartridge 5c.

[0046] The central section of the central tube 4 is symmetrically provided with multiple vertically extending central tube slots 4a, which intersect with the bushing through-holes 5a1. As the large rubber tube assembly 5 ascends, crude oil from above exerts pressure on the inner wall of the large rubber tube 5c through the central tube slots 4a and bushing through-holes 5a1, causing the large rubber tube 5c to expand outward and seal against the inner wall of the large casing. Crude oil pumped above the large rubber tube 5c is then blocked by the large rubber tube 5c and pushed upward until it reaches the wellhead.

[0047] A sealing gasket 8 is provided at the inner step at the root of the inner cone sealing surface of the sealing seat 6. When the wire rope 14 lifts the small sleeve puller assembly 13 along the small sleeve until it is combined 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.

[0048] The sealing gasket 8 can be embedded in the root of the inner cone sealing surface by interference fit or by bonding. Alternatively, an expanded burr can be provided on the upper portion of the sealing gasket 8 and embedded in an annular embedding groove at the root of the inner cone sealing surface to prevent the sealing gasket 8 from falling during the well landing process. The annular embedding groove can be a cutter groove at the root of the inner cone sealing surface.

[0049] An O-ring 11 is embedded in the upper portion of the outer cone sealing surface at the upper end of the sealing head 10. The outer cone sealing surface of the sealing head 10 fits in contact with the inner cone sealing surface of the sealing seat 6, and the O-ring 11 realizes a second seal to prevent the crude oil above from leaking downward along the central channel.

[0050] The upper end of the sealing seat wear-resistant rubber sleeve 7 is provided with an expanded bell mouth to facilitate the insertion of the wire rope 14. The sealing seat wear-resistant rubber sleeve 7 is provided with a slit along the entire length direction for easy replacement. The sealing 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.

[0051] A weighting rod connecting single ear is provided at the lower end of the small sleeve drawer assembly 13 , and a weighting rod 22 is suspended below the weighting rod connecting single ear.

[0052] The assembly process of the anti-eccentric wear split type reducing oil recovery tool is as follows:

[0053] 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 center tube 4;

[0054] Step 2: Assemble the centralizing joint 2, install the upper and lower centralizing wear-resistant rubber sleeves 3 in the central hole of the centralizing joint, and tighten the centralizing pressure cap 1 at the upper end of the centralizing joint 2;

[0055] Step 3: Sleeve the large rubber cylinder assembly 5 onto the outer periphery of the central tube 4, and then screw the lower end of the central tube 4 to the sealing seat 6. At this point, the installation of the split movable large sleeve drawer is completed.

[0056] Step 4: Pass the steel wire rope 14 through the center hole of the straightening pressure cap 1, the straightening joint 2, the straightening wear-resistant rubber sleeve 3, the center tube 4, the sealing seat 6 and the sealing seat wear-resistant rubber sleeve 7;

[0057] Step 5. The lower end of the wire rope 14 continues to pass through the center 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 outer periphery of the upper end of the sealing head 10 is a conical shape that is narrow at the top and wide at the bottom, and an O-ring 11 is embedded in the outer periphery of the upper part of the cone.

[0058] Step 6: Connect the single ear at the lower end of the rope cap 12 to the small sleeve puller assembly 13;

[0059] Step 7: Connect the single ear to the weighting rod 22 below the small sleeve puller assembly 13 through the weighting rod to complete the assembly.

[0060] like Figure 3 As shown, the upper end of the large casing is connected to the bottom of the wellhead spool 21. Casing gates are installed on both sides of the wellhead spool 21. Above the wellhead spool 21, a wire rope shear well sealer 20, a blowout preventer 19, a lubricating pipe 17, and a blowout box 15 are installed in sequence. The blowout box 15 contains a rubberized blowout box. A pressure joint 15a is located at the top of the blowout box 15. Hydraulic oil is injected through this joint to press the rubberized blowout box against the outer periphery of the wire rope 14, achieving a seal. The blowout box 15 is attached to the upper end of the lubricating pipe 17 via a reducer 16. A scoop outlet 18 is located on the lower sidewall of the lubricating pipe 17 to facilitate connection to a tanker truck. The upper end of the wire rope 14 passes through the central channel of the blowout box 15, lubricating pipe 17, blowout preventer 19, wire rope shear well sealer 20, and wellhead spool 21, extending downhole.

[0061] The oil recovery process is as follows:

[0062] After the vertical derrick and other safety operating procedures are in place, the anti-eccentric wear split-type reducing oil recovery tool is lowered from the wellhead. When the tool is lowered to the diameter change point of the large and small casings, the upper split movable large casing puller remains at the diameter change point, while the small casing puller assembly 13 continues to be lowered to the liquid level depth required by the regulations. The wire rope 14 is then raised. When the small casing puller assembly 13 reaches the diameter change point, the sealing head 10 above the rope cap 12 enters the inner conical surface of the lower part of the sealing seat 6. The lifting force generated by the weight of the crude oil and the acceleration causes the sealing gasket 8 to press against the inner step of the sealing seat 6, and the O-ring 11 to press against the inner conical surface of the lower part of the sealing seat 6, forming a double seal and preventing the crude oil from leaking back into the well from this point.

[0063] At the same time, the gravity and acceleration force of the crude oil act on the large rubber barrel 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.

[0064] The puller tool, which remains in the large casing, stops at the diameter change point, while the lower small casing puller assembly 13 is lowered with the wire rope 14. The wire rope 14 will rub against the inner wall of the upper large casing puller. This tool has a centering wear-resistant rubber sleeve 3 installed in the center hole of the centering joint 2 to protect the tool and the wire rope 14.

[0065] During the working process, the righting wear-resistant rubber sleeve 3 is checked and can be replaced if it is severely worn; the size and structure of the upper and lower righting 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, reducing loss cost and manufacturing cost, and second, there is an "installation seam" in the middle. After wear, the gap can be enlarged and the sleeve can be installed.

[0066] 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.

[0067] In actual application, it is assembled with the blowout preventer box 15, the blowout preventer 19 and the lubricator 17. The specific steps are as follows:

[0068] 1. Confirm that the oil well surface and downhole casing wall are ready for oil recovery;

[0069] 2. Actual assembly on site:

[0070] 2.1. Insert the steel wire rope 14 into the blowout preventer box 15, adjust the tightness of the blowout preventer rubber, and connect the pressure joint 15a on the upper part of the blowout preventer box 15 to the hydraulic pipeline;

[0071] 2.2. Pass the wire rope 14 through the lubricator 17, connect the blowout preventer box 15 to the lubricator 17, and then connect the lubricator 17 to the blowout preventer 19;

[0072] 2.3. Assemble the anti-eccentric wear split type reducing oil recovery tool;

[0073] 2.4. Connect the weighting rod 22 below the single ear of the weighting rod at the lower end of the small sleeve pull assembly 13;

[0074] 2.5. Erect the oil recovery derrick at the well site;

[0075] 3. Lower the tool according to the operating procedures. According to the depth parameter of the diameter change point of the large and small casing in the oil recovery design, when the anti-eccentric wear split type reducing oil recovery tool is lowered close to the depth, strictly control the speed;

[0076] 4. According to the weight display value of the oil recovery vehicle, determine whether it has reached the liquid surface and slowly lower it to allow the anti-eccentric wear split-type reducing oil recovery tool to enter the liquid surface to a certain depth;

[0077] 5. Lift upward at a certain speed. The small rubber cylinder in the middle of the small casing puller assembly 13 forms a seal 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 enters the flow channel 9 on the outer periphery of the sealing seat 6 and flows upward. 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 puller 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 conical surface of the lower part of the sealing seat 6, thereby achieving sealing.

[0078] 6. After the small casing puller assembly 13 is combined with the large casing puller, they move upward together under the traction of the wire rope 14. The gravity of the crude oil and the acceleration force act on the large rubber cylinder assembly 5, causing the large rubber cylinder 5c to expand and adhere to the inner wall of the large casing. The crude oil is then pumped out of the wellhead and flows out from the oil scavenging outlet 18 at the bottom of the blowout preventer 17 and into the ground tank truck.

[0079] 7. Observe the weight value of the oil recovery truck to determine the weight of crude oil and whether there is leakage;

[0080] 8. The sealing effect can be determined from the leakage through the liquid discharge situation, and the sealing system can be improved to achieve the minimum leakage when the large and small casing interfaces transition.

[0081] The above description is only a preferred embodiment of the present invention, which shows and describes the basic principles, main features and advantages of the present invention, but does not limit the scope of patent protection of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. In addition to the above embodiments, the present invention may have other implementation methods without departing from the spirit and scope of the present invention. The present invention may also have various changes and improvements, and all technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present invention. The scope of protection required by the present invention is defined by the attached claims and their equivalents. Technical features not described in the present invention can be achieved by or using existing technologies, and will not be described here.

Claims

1. An anti-eccentric wear split type reducing oil recovery tool, comprising a center tube, characterized in that: The outer periphery of the center tube is sheathed with a large rubber cylinder assembly that matches the large sleeve, the upper end of the center tube is screwed with a centralizing joint, the center hole of the centralizing joint is embedded with a centralizing wear-resistant rubber sleeve, the lower end of the center tube is screwed with a sealing seat, the middle section of the center hole of the sealing seat is provided with a throat, the throat is provided with a sealing seat wear-resistant rubber sleeve, the lower part of the throat is provided with an inner cone sealing surface that gradually expands downward, and the outer periphery of the sealing seat is evenly provided with multiple axially penetrating flow channels; The steel wire rope passes through the straightening wear-resistant rubber sleeve, the center tube and the sealing seat wear-resistant rubber sleeve. The lower end of the steel wire rope passes through the center hole of the sealing head and is fixed in the rope cap. The lower end of the rope cap is connected to a small sleeve puller assembly that matches the small sleeve. The upper end of the sealing head is provided with an outer cone sealing surface, and the outer cone sealing surface cooperates with the inner cone sealing surface.

2. The anti-eccentric wear split type different diameter oil recovery tool according to claim 1, characterized in that: The upper and lower ends of the center hole of the central joint are symmetrically embedded with the centralizing wear-resistant rubber sleeves.

3. The anti-eccentric wear split type different diameter oil recovery tool according to claim 2, characterized in that: The straightening wear-resistant rubber sleeve and the sealing seat wear-resistant rubber sleeve are respectively provided with slits along the entire length direction.

4. The anti-eccentric wear split type different diameter oil recovery tool according to claim 2, characterized in that: An inner step is provided in the middle of the center hole of the straightening joint, and the bottom of the upper straightening wear-resistant rubber sleeve is supported above the inner step of the center hole of the straightening joint. A straightening pressure cap is screwed into the upper port of the straightening joint, and the bottom of the straightening pressure cap is pressed on the top of the upper straightening wear-resistant rubber sleeve.

5. The anti-eccentric wear split type different diameter oil recovery tool according to claim 2, characterized in that: The top of the lower centralizing wear-resistant rubber sleeve is supported below the 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 central pipe.

6. The anti-eccentric wear split type different diameter oil scavenging tool according to claim 1, characterized in that: The middle section of the central tube is symmetrically provided with a plurality of central tube long grooves extending vertically.

7. The anti-eccentric wear split type different diameter oil recovery tool according to claim 6, characterized in that: The large rubber cylinder assembly includes a rubber cylinder bushing, a rubber cylinder upper pressure cap, a large rubber cylinder and a rubber cylinder lower pressure cap. The rubber cylinder bushing is sleeved on the outer periphery of the center tube, and the large rubber cylinder is sleeved on the outer periphery of the rubber cylinder bushing. The middle section of the rubber cylinder bushing is symmetrically provided with a plurality of bushing through holes that are connected with the long groove of the center tube. The lower end of the large rubber cylinder is embedded in the rubber cylinder lower pressure cap, and the rubber cylinder lower pressure cap is screwed to the lower end of the rubber cylinder bushing; the upper end of the rubber cylinder bushing is provided with an outer flange, and the outer periphery of the upper end of the large rubber cylinder is embedded in the rubber cylinder upper pressure cap, and the top of the rubber cylinder upper pressure cap rests on the bottom of the upper outer step of the rubber cylinder bushing.

8. The anti-eccentric wear split type different diameter oil scooping tool according to claim 7, characterized in that: A hexagonal head is provided on the outer periphery of the upper outer flange of the rubber sleeve bushing, an O-ring is embedded on the upper portion of the outer cone sealing surface of the upper end of the sealing head, and a sealing gasket is provided at the inner step at the root of the inner cone sealing surface of the sealing seat.

9. The anti-eccentric wear split type different diameter oil scooping tool according to claim 8, characterized in that: An expanded diameter burr is provided on the upper portion of the sealing gasket, and the expanded diameter burr is embedded in the annular embedding groove at the root of the inner cone sealing surface.

10. The anti-eccentric wear split type different diameter oil scooping tool according to claim 5, characterized in that: The upper ends of the sealing seat wear-resistant rubber sleeve and the upper centering wear-resistant rubber sleeve are respectively provided with expanded bell mouths, and the lower end of the lower centering wear-resistant rubber sleeve is provided with an expanded bell mouth.

11. The anti-eccentric wear split type different diameter oil recovery tool according to claim 5, characterized in that: The sealing seat wear-resistant rubber sleeve and the straightening wear-resistant rubber sleeve have the same shape and size. The lower end of the small sleeve puller assembly is provided with a single ear, and a weighting rod is hung below the single ear.

12. The anti-eccentric wear split type different diameter oil scavenging tool according to any one of claims 1 to 11, characterized in that: The upper end of the large casing is connected to the bottom of the wellhead four-way, and the wire rope shear well sealer, blowout preventer, blowout preventer and blowout preventer box are installed in sequence above the wellhead four-way. The upper end of the wire rope passes through the central channel of the blowout preventer box, blowout preventer, blowout preventer, wire rope shear well sealer and wellhead four-way in sequence and extends to the bottom of the well.

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