Salvageable drilling-plug-free packing well cementation and completion device and process method

Abstract

The invention provides a salvageable drilling-plug-free packing well cementation and completion device and a technological method.The salvageable drilling-plug-free packing well cementation and completion device comprises an outer barrel device, a closing barrel, an upper salvage barrel device, a lower salvage barrel device and a rubber plug device, the closing barrel is located on the inner side of the outer barrel device, the upper salvage barrel device is located on the inner side of the closing barrel and is connected with the closing barrel in a releasable mode, and the rubber plug device is located on the lower salvage barrel device; the lower overshot device is arranged on the inner side of the outer barrel device and located below the upper overshot device and the closing barrel, the lower overshot device abuts against the closing barrel, the upper overshot device and the outer barrel device, and the rubber plug device can be arranged on the inner side of the upper overshot device. According to the salvageable drilling-plug-free packing well cementation and completion device and the technological method thereof, the device can be salvaged, drilling plug is avoided, and efficiency is high; the fishing force is large, the reverse loading capacity is high, and the well control safety is good; the whole body can be made of a composite material or can be drilled; the inside and the outside are communicated in the tripping-in process of the pipe column, automatic grouting can be achieved, and operation efficiency is high.

Description

Technical Field

[0001] The invention relates to the field of oil and gas field development, and in particular to a salvageable drilling-free plugging and cementing completion device and a process method. Background Art

[0002] In a cementing completion process in special wells such as horizontal wells, a more common solution is to use upper cementing and lower screen completion. This process requires separate supporting tools such as blind plates, grading collars, and open hole packers during construction. After the construction is completed, a drill bit needs to be lowered to drill out the grading collars and blind plates. There are problems such as long construction time, low drilling efficiency, and high drilling risk.

[0003] Document CN 209704529 U discloses a drillable grading collar, comprising a body with a circulation hole on the side wall, a first sleeve built into the body and blocking the circulation hole, a one-way valve pin connecting the body and the first sleeve and breaking after being subjected to force, a second sleeve arranged in the body, a connecting piece connecting the body and the second sleeve and breaking after being subjected to force, and a guide piece arranged on the side wall of the body, the first sleeve being provided with a first sealing plug to seal the upper and lower spaces of the first sleeve, a seat portion defined by the inner wall at one end of the second sleeve being provided with a second sealing plug, so that the second sleeve moves downward axially relative to the body to block the circulation hole opened by the first sleeve, the guide piece is guided by a guide groove arranged on the outer wall of the second sleeve and moves along the guide groove, so that the second sleeve moves downward axially relative to the body until the second sleeve blocks the circulation hole. During the period when the first sliding sleeve opens the circulation hole and the second sliding sleeve closes the circulation hole, the one-way valve pin allows the mixed liquid to flow into the annulus and prevents the mixed liquid or cement slurry from returning from the annulus to the body, so as to overcome the problem of failure of cement slurry circulation hole opening and closing occurring in the cementing process of the drillable graded collar, thereby improving the cementing operation efficiency. However, there are the following shortcomings: drilling and plugging operations are required after construction, the construction time is long, the drilling and plugging efficiency is low, and there are certain risks in the drilling and plugging process.

[0004] Based on this, there is room for improvement in improving construction efficiency. Summary of the invention

[0005] In view of the shortcomings of the prior art in the cementing and completion process of special wells such as horizontal wells, such as the need for drilling and plugging, long construction time, low efficiency and difficulty, the purpose of the present invention is to provide a salvageable, drill-free, plug-free cementing and completion device and process method to improve the construction efficiency.

[0006] In order to achieve the above object, the technical solution provided by the present invention is:

[0007] A bailed-out drilling-free plugging and cementing completion device comprises an outer tube device, a closing tube, an upper bailed tube device, a lower bailed tube device and a rubber plug device, wherein the closing tube is located inside the outer tube device, the upper bailed tube device is located inside the closing tube and is releasably connected to the closing tube, the lower bailed tube device is inside the outer tube device and is located below the upper bailed tube device and the closing tube, the lower bailed tube device is respectively in contact with the closing tube, the upper bailed tube device and the outer tube device, and the rubber plug device can be arranged inside the upper bailed tube device.

[0008] The closing cylinder is configured to be axially movable relative to the outer cylinder device, and has a pressing position abutting against the outer cylinder device and a clamping position clamping against the outer cylinder device. When the closing cylinder is in the pressing position, the transverse through hole provided on the closing cylinder is in fluid communication with the liquid outlet provided on the outer cylinder device, and when the closing cylinder is in the clamping position, the transverse through hole provided on the closing cylinder is not in fluid communication with the liquid outlet;

[0009] When the upper canister device is connected to the closing tube, the transverse through hole of the upper canister device is not in fluid communication with the transverse through hole of the closing tube; when the upper canister device is disconnected from the closing tube, the upper canister device can be axially moved downward so that the transverse through hole of the upper canister device is in fluid communication with the transverse through hole of the closing tube;

[0010] A connecting gap is formed between the outer tube device, the closing tube and the lower scoop device, and the fluid can enter the outer tube device through the liquid inlet hole on the lower scoop device and the connecting gap to cause the outer tube device to partially expand outward to achieve sealing.

[0011] In some embodiments, the salvageable drill-free plug isolation cementing completion device further includes a lower joint, which is threadedly connected to the outer tube device below the outer tube device.

[0012] In some embodiments, the outer cylinder device includes an outer cylinder, an upper protective cylinder, an outer center cylinder, a rubber cylinder and a lower protective cylinder. The outer cylinder, the upper protective cylinder, the outer center cylinder and the lower protective cylinder are threadedly connected in sequence. The rubber cylinder is sleeved on the outside of the outer center cylinder. The upper part of the rubber cylinder is vulcanized and connected to the outer side of the lower part of the upper protective cylinder. The lower part of the rubber cylinder is vulcanized and connected to the outer side of the upper part of the lower protective cylinder. The lower protective cylinder is threadedly connected to the lower joint, and the liquid outlet is arranged on the outer cylinder.

[0013] In some embodiments, a positioning groove for positioning the closing cylinder is provided on the inner side of the upper portion of the outer cylinder.

[0014] In some embodiments, a coupling portion for coupling with the sleeve is disposed on the inner side of the top of the outer tube.

[0015] In some embodiments, an outer cylinder boss is disposed on the inner side of the outer cylinder, and a closing cylinder boss is disposed on the outer side of the closing cylinder. When the closing cylinder is in the tightening position, the closing cylinder boss abuts against the outer cylinder boss.

[0016] In some embodiments, the outer center tube is provided with a threaded countersunk hole, the liquid inlet valve is located in the threaded countersunk hole and is threadedly connected to the threaded countersunk hole, and the fluid entering through the liquid inlet hole on the lower scoop device can enter the gap between the outer center tube and the rubber cylinder through the connecting gap and the liquid inlet valve to cause the rubber cylinder to expand outward.

[0017] In some embodiments, an outer center tube boss is provided on the inner side of the outer center tube, and the outer center tube boss abuts against the lower scoop device.

[0018] In some embodiments, a positioning piece and a groove are provided on the upper portion of the closing cylinder. The positioning piece is formed when the groove is cut and is located above the groove. The positioning piece is used to position the closing cylinder on the outer cylinder device.

[0019] In some embodiments, the closing tube is releasably connected to the upper canister assembly via shear pins.

[0020] In some embodiments, the upper salvage tube device includes a salvage tube, a ball seat and a connecting tube that are threadedly connected in sequence. The transverse through hole of the upper salvage tube device includes a salvage tube elongated hole arranged on the salvage tube and a ball seat elongated hole arranged on the ball seat. The positions of the salvage tube elongated hole and the ball seat elongated hole correspond to each other, and the lower part of the ball seat is releasably connected to the closing tube through shear nails.

[0021] In some embodiments, a top boss is disposed on the outer side of the top of the overshot shell to limit the upward movement of the closing shell.

[0022] In some embodiments, a reverse thread for cooperating with a fishing tool is provided on the inner side of the top of the overshot.

[0023] In some embodiments, a conical surface capable of cooperating with the second sealing ball is disposed on the inner side of the ball seat.

[0024] In some embodiments, the lower scoop device includes an inner center tube and a plug, the inner side of the lower portion of the inner center tube is threadedly connected to the outer side of the plug, a first boss arranged on the inner side of the upper portion of the inner center tube abuts against a connecting tube boss arranged on the outer side of the lower portion of the connecting tube, a second boss arranged on the outer side of the upper portion of the inner center tube abuts against a lower boss arranged on the inner side of the lower portion of the closing tube, and the liquid inlet hole on the lower scoop device is arranged on the inner center tube.

[0025] In some embodiments, the third boss arranged on the outer side of the inner center tube abuts against the lower side of the outer center tube boss on the inner side of the outer center tube, and a connecting gap is formed between the outer side of the inner center tube, the bottom end of the closing tube, the inner side of the outer center tube and the inner side of the upper protective tube.

[0026] In some embodiments, a concave ring is provided on the outside of the plug, which is circumferentially distributed on the outside of the plug, and when the plug and the inner center tube are threadedly connected, the position of the concave ring corresponds to the position of the third boss, so that when the third boss is retracted by force, it is accommodated by the concave ring to offset the effect of the force.

[0027] In some embodiments, the rubber plug device includes a rubber plug and a central shaft. The rubber plug is arranged outside and above the central shaft, and the rubber plug is vulcanized and connected to the outer side of the upper part of the central shaft.

[0028] In some embodiments, the rubber plug device further comprises a locking ring, a central shaft groove for accommodating the locking ring is arranged on the outer side of the central shaft, and a salvage tube groove for accommodating the locking ring is arranged on the inner side of the salvage tube, and the central shaft and the salvage tube can be locked together by the locking ring.

[0029] The method for performing well completion operation using the above-mentioned salvageable drilling-free plugging and cementing completion device comprises the following steps:

[0030] Step 1, connecting the outer cylinder device, the closing cylinder, the upper bailing cylinder device, and the lower bailing cylinder device to form a bailed-out drill-free plugging and cementing completion device without a rubber plug device, and lowering the bailed-out drill-free plugging and cementing completion device without a rubber plug device into a predetermined position in the well using a casing string;

[0031] Step 2, inserting a first sealing ball into the inside of the retrievable drill-free plugging and cementing completion device without a rubber plug device and pumping fluid into it, so that the fluid enters the outer cylinder device through the liquid inlet hole and the connecting gap, so that the outer cylinder device part expands outward and finally contacts the well wall, thereby isolating the annulus between the outer cylinder device and the well wall;

[0032] Step 3, inserting a second sealing ball into the inside of the retrievable drill-free plugging and cementing completion device without a rubber plug device and continuing to pump fluid, so that the upper retrievable tube device is disconnected from the closing tube, and the upper retrievable tube device is axially moved downward until the transverse through hole of the upper retrievable tube device, the transverse through hole of the closing tube and the fluid outlet hole of the outer tube device are fluidically connected, and cementing operations can be carried out according to the situation;

[0033] Step 4, inserting a rubber plug device into the inside of the retrievable drill-free plug isolation cementing completion device without a rubber plug device, and finally locking the rubber plug device to the upper retrieving tube device, waiting for cement to solidify;

[0034] Step 5, after the cement solidifies, lower the salvage tool into the well, and cooperate with the upper salvage tube device to salvage the upper salvage tube device, the lower salvage tube device and the rubber plug device, while the outer tube device and the closing tube remain in the well.

[0035] The beneficial effects of the present invention are:

[0036] The salvageable, drill-free plug isolation cementing completion device and process method of the present invention have the following advantages: salvageable, drill-free, and high efficiency; large salvaging force, high reverse pressure bearing capacity, and good well control safety; composite materials can be used as a whole, and can also be drilled out; the inside and outside are connected during the lowering of the pipe string, automatic grouting can be realized, and the operation efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 A schematic diagram showing the overall structure of a salvageable, drill-free plugging and cementing completion device;

[0038] Figure 2 A schematic diagram showing the structure of a retrievable drill-free plugging and cementing completion device without a rubber plug device entering the well;

[0039] Figure 3 show Figure 2 A schematic diagram of an enlarged structure of the dotted line portion;

[0040] Figure 4 A schematic diagram showing the structure of a retrievable drill-free plugging and cementing completion device without a rubber plug device, in which a first sealing ball is put in and fluid is pumped in;

[0041] Figure 5 A schematic diagram showing the structure of a retrievable drill-free plugging and cementing completion device without a rubber plug device in which a second sealing ball is inserted and fluid is pumped in;

[0042] Figure 6 A schematic diagram showing the structure of a retrievable drill-free plugging and cementing completion device without a plug device after the plug device is inserted;

[0043] Figure 7 A schematic diagram showing the well retention structure of the salvageable drill-free plug isolation cementing completion device after salvage. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments and drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0045] It should be noted that, in the description of the present invention, unless otherwise specified, the meaning of "multiple" is greater than or equal to two; the terms "upper", "lower", "left", "right", "inside", "outside", etc., indicating the orientation or positional relationship are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly. In addition, the "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different parts.

[0046] like Figure 1-4As shown, the bailed-out drill-free plugging and cementing completion device provided by the present invention comprises an outer tube device, a closing tube 6, an upper bailed tube device, a lower bailed tube device and a rubber plug device, the closing tube 6 is located on the inner side of the outer tube device, the upper bailed tube device is located on the inner side of the closing tube 6 and is releasably connected to the closing tube 6, the lower bailed tube device is on the inner side of the outer tube device and is located below the upper bailed tube device and the closing tube 6, the lower bailed tube device is respectively in contact with the closing tube 6, the upper bailed tube device and the outer tube device, and the rubber plug device can be arranged on the inner side of the upper bailed tube device. The closing tube 6 is configured to be axially movable relative to the outer tube device, and has a top tightening position abutting against the outer tube device and a clamping position clamped with the outer tube device. When the closing tube 6 is in the top tightening position, the transverse through hole provided on the closing tube 6 is in fluid communication with the liquid outlet hole 12 provided on the outer tube device. When the closing tube 6 is in the clamping position, the transverse through hole provided on the closing tube 6 is not in fluid communication with the liquid outlet hole 12, thereby realizing the opening or closing of the liquid outlet hole 12 by the closing tube 6. When the upper scooping tube device is connected to the closing tube 6, the upper scooping tube device The transverse through hole of the upper bailing tube device is not fluidically connected with the transverse through hole of the closing tube 6. When the upper bailing tube device is disconnected from the closing tube 6, the upper bailing tube device can be moved axially downward so that the transverse through hole of the upper bailing tube device is fluidically connected with the transverse through hole of the closing tube 6, thereby realizing the connection or disconnection between the upper bailing tube device and the closing tube 6; a connecting gap 39 is formed between the outer tube device, the closing tube 6 and the lower bailing tube device, and the fluid can enter the outer tube device through the liquid inlet hole 19 and the connecting gap 39 on the lower bailing tube device, causing the outer tube device to partially expand outward to achieve sealing.

[0047] In the present invention, the bailed-out drilling-free plugging and cementing completion device, the outer tube device, the closing tube 6, the upper bailing tube device, the lower bailing tube device and the rubber plug device are coaxially designed. Figure 2 As shown in , the axial direction 41 is the vertical direction.

[0048] The retrievable drilling-free plugging and cementing completion device of the present invention further comprises a lower joint 24, which is threadedly connected to the outer tube device below the outer tube device. The lower joint 24 is mainly used to be threadedly connected to other tools through the lower end, thereby connecting the retrievable drilling-free plugging and cementing completion device to other tools.

[0049] The outer cylinder device includes an outer cylinder 1, an upper protective cylinder 16, an outer center cylinder 17, a rubber cylinder 18 and a lower protective cylinder 22. The outer cylinder 1, the upper protective cylinder 16, the outer center cylinder 17 and the lower protective cylinder 22 are threadedly connected in sequence. The rubber cylinder 18 is sleeved on the outside of the outer center cylinder 17. The upper part of the rubber cylinder 18 is vulcanized and connected to the outer side of the lower part of the upper protective cylinder 16. The lower part of the rubber cylinder 18 is vulcanized and connected to the outer side of the upper part of the lower protective cylinder 22. The lower protective cylinder 22 is threadedly connected to the lower joint 24, and the liquid outlet 12 is arranged on the outer cylinder 1.

[0050] In some embodiments, the inner side of the lower part of the outer tube 1 is threadedly connected to the outer side of the upper part of the upper protective tube 16, the inner side of the lower part of the upper protective tube 16 is threadedly connected to the outer side of the upper part of the outer center tube 17, and the outer side of the lower part of the outer center tube 17 is threadedly connected to the inner side of the upper part of the lower protective tube 22. A gap 25 (such as 25) can be formed between the outer side of the lower part of the upper protective tube 16, the outer side of the outer center tube 17, the outer side of the upper part of the lower protective tube 22 and the inner side of the rubber tube 18. Figure 4 The outer side of the lower part of the lower protection tube 22 is threadedly connected with the inner side of the upper part of the lower joint 24.

[0051] In some embodiments, the inner side of the lower part of the outer tube 1 is provided with an internal thread, the outer side of the upper part of the upper protective tube 16 is provided with an external thread, and the inner inner thread of the lower part of the outer tube 1 is threadedly connected with the outer outer thread of the upper part of the upper protective tube 16. The inner side of the lower part of the upper protective tube 16 is provided with an internal thread, the outer side of the upper part of the outer center tube 17 is provided with an external thread, and the inner inner thread of the lower part of the upper protective tube 16 is threadedly connected with the outer outer thread of the upper part of the outer center tube 17. The outer outer side of the lower part of the outer center tube 17 is provided with an external thread, the inner side of the upper part of the lower protective tube 22 is provided with an internal thread, and the outer outer thread of the lower part of the outer center tube 17 is threadedly connected with the inner inner thread of the upper part of the lower protective tube 22. The outer side of the lower part of the lower protective tube 22 is provided with an external thread, the inner side of the upper part of the lower joint 24 is provided with an internal thread, and the outer outer thread of the lower part of the lower protective tube 22 is threadedly connected with the inner inner thread of the upper part of the lower joint 24.

[0052] In some embodiments, the liquid outlet hole 12 is arranged on the middle and lower part of the outer cylinder 1, and the annulus between the outer side of the outer cylinder 1 and the well wall (not shown) can be filled with cement slurry through the liquid outlet hole 12, that is, the annulus between the outer cylinder device and the well wall is filled with cement slurry. There can be multiple liquid outlet holes 12 and they are evenly arranged along the circumference of the outer cylinder 1.

[0053] In some embodiments, a positioning groove 2 is provided on the inner side of the upper portion of the outer cylinder 1 . The cross section of the positioning groove 2 is an arc-shaped groove. The positioning groove 2 is used to position the closing cylinder 6 .

[0054] In some embodiments, an outer cylinder boss 26 is provided on the inner side of the outer cylinder 1, and a closing cylinder boss 27 is provided on the outer side of the closing cylinder 6. When the closing cylinder 6 is in the tightening position, the closing cylinder boss 27 abuts against the outer cylinder boss 26, thereby realizing the abutment between the closing cylinder 6 and the outer cylinder 1, that is, realizing the abutment between the closing cylinder 6 and the outer cylinder device.

[0055] like Figure 3 As shown, the outer cylinder boss 26 is arranged on the inner side of the middle part of the outer cylinder 1, and the closing cylinder boss 27 is arranged on the outer side of the upper part of the closing cylinder 6. The closing cylinder boss 27 abuts against the outer cylinder boss 26, which means that the closing cylinder boss 27 is above the outer cylinder boss 26 and the bottom of the closing cylinder boss 27 abuts against the top of the outer cylinder boss 26.

[0056] The closing cylinder 6 is configured to be axially movable relative to the outer cylinder 1, that is, the closing cylinder 6 is configured to be axially movable relative to the outer cylinder device. The downward movement of the closing cylinder 6 relative to the outer cylinder 1 is restricted by the closing cylinder boss 27 and the outer cylinder boss 26. When the closing cylinder 6 moves downward relative to the outer cylinder 1 until the closing cylinder boss 27 abuts against the outer cylinder boss 26, the closing cylinder 6 abuts against the outer cylinder 1, and the closing cylinder 6 moves downward relative to the outer cylinder 1 to a position.

[0057] A coupling portion is provided on the inner side of the top of the outer tube 1 for coupling with a sleeve (not shown). In some embodiments, the coupling portion is an internal thread on the inner side of the top of the outer tube 1, and the coupling of the outer tube 1 and the sleeve is achieved by threaded connection between the internal thread on the inner side of the top of the outer tube 1 and the external thread on the outer side of the bottom of the sleeve.

[0058] The outer center tube 17 is provided with a threaded countersunk hole, and the liquid inlet valve 20 is located in the threaded countersunk hole and is threadedly connected to the threaded countersunk hole. The fluid can be introduced between the outer center tube 17 and the rubber tube 18 through the liquid inlet valve 20 to form a gap 25 and fill the gap 25 with fluid, so that the rubber tube 18 moves outward and expands, so that the rubber tube 18 can contact the well wall outside the rubber tube 18, thereby isolating the annulus between the rubber tube 18 and the well wall, and realizing the setting seal between the bailed-out drill-free plugging and cementing completion device and the well wall. Therefore, the fluid entering through the liquid inlet hole 19 on the lower bailing tube device can enter the gap 25 between the outer center tube 17 and the rubber tube 18 through the connecting gap 39 and the liquid inlet valve 20 to make the rubber tube 18 expand outward, so that the fluid enters the outer tube device and partially expands the outer tube device outward. In some embodiments, the threaded countersunk hole is arranged on the middle part of the outer center tube 17 and passes through the wall of the outer center tube 17. There can be multiple threaded counterbores that are evenly arranged along the circumference of the outer central tube 17, and are equipped with the same number of liquid inlet valves 20, and each liquid inlet valve 20 is threadedly connected in a corresponding threaded counterbore.

[0059] The inner side of the outer center tube 17 is provided with an outer center tube boss 28, and the outer center tube boss 28 abuts against the lower scoop device. In some embodiments, the outer center tube boss 28 is arranged on the inner side of the middle and lower part of the outer center tube 17.

[0060] The upper part of the closing cylinder 6 is provided with a positioning piece 3 and a cutting groove 5. The positioning piece 3 is formed when the cutting groove 5 is cut and is located above the cutting groove 5. The positioning piece 3 is used to position the closing cylinder 6 on the outer cylinder device. The top of the positioning piece 3 can be partially accommodated in the positioning groove 2 of the outer cylinder 1, so that the closing cylinder 6 is in a clamping position relative to the outer cylinder 1, that is, the closing cylinder 6 is in a clamping position relative to the outer cylinder device. The upward movement of the closing cylinder 6 relative to the outer cylinder 1 is limited by the positioning piece 3 and the positioning groove 2. When the closing cylinder 6 moves upward relative to the outer cylinder 1 until the top of the positioning piece 3 is partially accommodated in the positioning groove 2, the closing cylinder 6 moves up to the position relative to the outer cylinder 1.

[0061] The closing tube 6 is provided with a threaded hole, in which a shearing nail 13 is provided, and the closing tube 6 is releasably connected to the upper canister device through the shearing nail 13. The releasable connection between the closing tube 6 and the upper canister device means that the closing tube 6 and the upper canister device are fixedly connected together through the shearing nail 13. When the closing tube 6 or the upper canister device is subjected to the force and has a tendency to move relative to each other, the shearing nail 13 is subjected to the force and the shearing nail 13 will break when the force reaches a certain value, so that the closing tube 6 and the upper canister device are no longer fixedly connected and can move relative to each other under the action of the force. In some embodiments, the threaded hole is provided on the lower part of the closing tube 6 and passes through the tube wall of the closing tube 6. There can be multiple threaded holes and they are evenly arranged along the circumference of the closing tube 6, and the same number of shearing nails 13 are provided to releasably connect the closing tube 6 and the upper canister device.

[0062] In some embodiments, the transverse through hole of the closing cylinder 6 is arranged on the lower part of the closing cylinder 6. The transverse through hole of the closing cylinder 6 is a through hole that passes through the cylinder wall of the closing cylinder 6 and is arranged in the radial direction of the closing cylinder 6. When the closing cylinder 6 is in a tight position relative to the outer cylinder 1, the transverse through hole of the closing cylinder 6 is in fluid communication with the liquid outlet hole 12 of the outer cylinder 1, and the closing cylinder 6 is in fluid communication with the outer cylinder 1, so that the closing cylinder 6 opens the liquid outlet hole 12. When the closing cylinder 6 is in a clamping position relative to the outer cylinder 1, the transverse through hole of the closing cylinder 6 is not in fluid communication with the liquid outlet hole 12, and the closing cylinder 6 is not in fluid communication with the outer cylinder 1, so that the closing cylinder 6 closes the liquid outlet hole 12. There can be multiple transverse through holes of the closing cylinder 6 and they are evenly arranged along the circumference of the closing cylinder 6. The number of the transverse through holes of the closing cylinder 6 is the same as the number of the liquid outlet holes 12, and when the closing cylinder 6 is in a tightening position relative to the outer cylinder 1, each transverse through hole of the closing cylinder 6 is fluidly connected with the corresponding liquid outlet hole 12, and when the closing cylinder 6 is in a clamping position relative to the outer cylinder 1, each transverse through hole of the closing cylinder 6 is not fluidly connected with the corresponding liquid outlet hole 12, thereby achieving simultaneous fluid communication or simultaneous non-fluid communication between the transverse through holes of the closing cylinder 6 and the corresponding liquid outlet hole 12.

[0063] In some embodiments, the transverse through hole of the closing tube 6 is a closing tube elongated hole 11 (such as Figure 4 The dashed line and Figure 7 ) as shown by the solid line in .

[0064] The upper overshot device comprises an overshot 4, a ball seat 10 and a connecting tube 14 which are threadedly connected in sequence. The overshot 4 is provided with an overshot elongated hole (not shown) in the radial direction, and the ball seat 10 is provided with an elongated hole 29 in the ball seat in the radial direction. The overshot elongated hole corresponds to the elongated hole 29 in the ball seat, so that when the overshot 4 and the ball seat 10 are threadedly connected together, the overshot elongated hole is completely aligned with the elongated hole 29 in the ball seat. The transverse through hole of the upper overshot device comprises the elongated hole of the overshot 4 and the elongated hole 29 in the ball seat 10, and the elongated hole of the overshot and the elongated hole 29 in the ball seat are completely aligned.

[0065] In some embodiments, the overshot elongated hole and the ball seat elongated hole 29 are manufactured after the overshot 4 and the ball seat 10 are threadedly connected.

[0066] In some embodiments, the inner side of the lower portion of the overshot tube 4 is threadedly connected to the outer side of the upper portion of the ball seat 10 , and the inner side of the lower portion of the ball seat 10 is threadedly connected to the outer side of the upper portion of the connecting tube 14 .

[0067] In some embodiments, the lower inner side of the overshot tube 4 is provided with an internal thread, the upper outer side of the ball seat 10 is provided with an external thread, and the lower inner inner thread of the overshot tube 4 is threadedly connected with the upper outer outer thread of the ball seat 10. The lower inner side of the ball seat 10 is provided with an internal thread, the upper outer side of the connecting tube 14 is provided with an external thread, and the lower inner inner thread of the ball seat 10 is threadedly connected with the upper outer outer thread of the connecting tube 14.

[0068] A ball seat groove is arranged on the outer side of the lower part of the ball seat 10, and the ball seat groove matches the shearing nail 13 in the threaded hole of the closing tube 6, and the lower part of the ball seat 10 is releasably connected to the closing tube 6 through the shearing nail 13. There can be multiple ball seat grooves and they are evenly arranged along the circumference of the ball seat 10. The number of ball seat grooves is the same as the number of threaded holes of the closing tube 6, and each ball seat groove is matched with the corresponding threaded hole of the closing tube 6 by each shearing nail 13, so that the ball seat 10 and the closing tube 6 are releasably connected, and thus the closing tube 6 is releasably connected to the upper scoop device. When the shearing nail 13 is cut off, the ball seat 10 and the closing tube 6 are released from each other and the ball seat 10 can move axially relative to the closing tube 6.

[0069] The positions of the transverse through hole of the upper canister device and the transverse through hole of the closing tube 6 may correspond to the positions of the liquid outlet holes 12 of the outer tube device. Figure 5When the closing tube 6 is in contact with the outer tube 1 and the ball seat 10 is released and moves down to the closing tube 6, the positions of the transverse through holes of the upper fishing tube device and the transverse through holes of the closing tube 6 can correspond to the positions of the liquid outlet hole 12. At this time, the positions of the long holes 29 of the ball seat, the long holes of the salvage tube, the long holes 11 of the closing tube and the liquid outlet hole 12 correspond to each other, and the long holes 29 of the ball seat, the long holes of the salvage tube, the long holes 11 of the closing tube and the liquid outlet hole 12 are fluidically connected, so that the salvageable drill-free plugging and cementing completion device of the present invention are connected inside and outside.

[0070] In some embodiments, a top boss 30 is provided on the outer side of the top of the overshot tube 4 to limit the upward movement of the closing tube 6. When the positioning piece boss 31 on the inner side of the top of the positioning piece 3 abuts against the top boss 30, the overshot tube 4 blocks the transverse through hole of the closing tube 6. In this case, when the overshot tube 4 is moved upward by the upward pulling force, the top boss 30 of the overshot tube 4 exerts an upward thrust on the positioning piece boss 31 of the abutting positioning piece 3, so that the positioning piece 3 and the closing tube 6 move upward together with the overshot tube 4; when the top of the positioning piece 3 reaches the positioning groove 2, the top of the positioning piece 3 is partially accommodated in the positioning groove 2 so that the top of the top boss 30 is separated from the bottom of the positioning piece boss 31, and the top boss 30 passes over the positioning piece 3, so that the closing tube 6 stops moving upward.

[0071] In some embodiments, a reverse thread for cooperating with a fishing tool is provided on the inner side of the top of the overshot 4. The fishing tool (not shown) can catch the reverse thread of the overshot 4, and the overshot 4 is moved upward by applying an upward pulling force to the overshot 4 through the fishing tool.

[0072] In some embodiments, an overshot boss 32 is disposed inside the overshot 4, and the overshot boss 32 matches the shape of the outer side of the plug device, so that the plug device can be retained on the inside of the overshot 4 by the overshot boss 32. The overshot boss 32 is disposed on the inner side of the middle and lower part of the overshot 4.

[0073] In some embodiments, an overshot groove is provided on the overshot boss 32, that is, an overshot groove is provided inside the overshot 4, and the overshot groove is used to accommodate the locking ring 9. The overshot 4 and the plug device can be locked together by matching the locking ring 9 in the overshot groove. Therefore, the upper overshot device and the plug device can be locked together by the locking ring 9. In some embodiments, the overshot groove is provided on the lower inner side of the overshot 4. There can be a plurality of overshot grooves and they are evenly arranged along the circumference of the overshot 4.

[0074] In some embodiments, a conical surface that can cooperate with a second sealing ball (not shown) is disposed on the inner side of the ball seat 10. The conical surface can be disposed on the inner side of the middle portion of the ball seat 10.

[0075] In some embodiments, the shape of the inner side of the top of the ball seat 10 matches the shape of the outer side of the bottom of the plug device, so that the plug device can be supported on the inner side of the top of the ball seat 10.

[0076] The lower bailing tube device includes an inner central tube 15 and a plug 21, and the inner side of the lower part of the inner central tube 15 is threadedly connected to the outer side of the plug 21. In some embodiments, the inner side of the lower part of the inner central tube 15 is provided with an internal thread, and the outer side of the middle and lower part of the plug 21 is provided with an external thread, and the inner thread of the lower part of the inner central tube 15 is threadedly connected to the outer thread of the middle and lower part of the plug 21. The liquid inlet 19 on the lower bailing tube device is provided on the inner central tube 15.

[0077] In some embodiments, the first boss 33 disposed on the inner side of the upper portion of the inner central tube 15 abuts against the connecting tube boss 34 disposed on the outer side of the lower portion of the connecting tube 14, so that the inner central tube 15 does not slide on the connecting tube 14 and moves upward with the upward movement of the connecting tube 14. Therefore, the lower scoop device abuts against the upper scoop device.

[0078] In some embodiments, the second boss 35 disposed on the outer side of the upper portion of the inner central tube 15 abuts against the lower boss 36 on the inner side of the lower portion of the closing tube 6. Therefore, the lower scoop device abuts against the closing tube 6.

[0079] A moving gap 37 can be formed between the bottom end of the ball seat 10, the outside of the connecting tube 14, the inside of the closing tube 6 and the top end of the inner center tube 15, and the moving gap 37 limits the axial moving range of the ball seat 10. When the closing tube 6 is in the tightening position, when the shear pin 13 is cut off, the ball seat 10 can move axially downward relative to the closing tube 6 under the action of the downward force until the bottom end of the ball seat 10 contacts the top end of the inner center tube 15, at which time the ball seat 10 moves down to the position, the size of the moving gap 37 is approximately zero, and the long strip hole 29 of the ball seat, the long strip hole of the salvage tube, the long strip hole 11 of the closing tube and the liquid outlet 12 are in fluid communication. After the bottom end of the ball seat 10 contacts the top end of the inner center tube 15, the ball seat 10 can move axially upward relative to the closing tube 6 under the action of the upward force until the first boss 33 of the inner center tube 15 abuts against the connecting tube boss 34 of the connecting tube 14, at which time the ball seat 10 moves up to the position.

[0080] In some embodiments, the third boss 38 disposed on the outer side of the inner center tube 15 abuts against the lower side of the outer center tube boss 28 on the inner side of the outer center tube 17. Therefore, a connecting gap 39 is formed between the outer side of the inner center tube 15, the bottom end of the closing tube 6, the inner side of the outer center tube 17, and the inner side of the upper protection tube 16, that is, a connecting gap 39 is formed between the outer tube device, the closing tube 6, and the lower scoop device. The third boss 38 is disposed on the outer side of the lower portion of the inner center tube 15, and the third boss 38 is a through groove structure.

[0081] In some embodiments, the liquid inlet hole 19 is arranged in the middle of the inner center tube 15, and the liquid inlet hole 19 is connected with the liquid inlet valve 20 of the outer center tube 17 through the connecting gap 39. The fluid can pass through the liquid inlet hole 19 and the connecting gap 39 into the liquid inlet valve 20, and then pass into the gap 25 between the outer center tube 17 and the rubber tube 18 to cause the rubber tube 18 to expand outward.

[0082] In some embodiments, a concave ring 40 is provided on the outside of the plug 21, and the concave ring 40 is circumferentially distributed on the outside of the plug 21, and when the plug 21 and the inner center tube 15 are threadedly connected, the position of the concave ring 40 corresponds to the position of the third boss 38 of the inner center tube 15, so that when the third boss 38 is retracted by force, it can be accommodated by the concave ring 40 to offset the effect of the force. The length of the concave ring 40 in the axial direction 41 is greater than the length of the outer center tube boss 28 of the outer center tube 17 in the axial direction 41 and the length of the third boss 38 of the inner center tube 15 in the axial direction 41. In the process that the inner center tube 15 is subjected to the upward force and moves axially upward relative to the outer center tube 17, when the third boss 38 is squeezed by the outer center tube boss 28 and moves away from the outer center tube boss 28, the concave ring 40 can accommodate the deformation of the third boss 38, so that the third boss 38 can move above the outer center tube boss 28, thereby separating the inner center tube 15 from the outer center tube 17.

[0083] In some embodiments, a conical surface is provided on the inner side of the upper portion of the plug 21, so that the opening on the inner side of the upper portion of the plug 21 is larger at the top and smaller at the bottom, so that the inner side of the upper portion of the plug 21 can stably accommodate a first sealing ball (not shown).

[0084] In some embodiments, a mounting hole 23 is provided at the bottom of the plug 21. The mounting hole 23 is a process hole that serves the purpose of assembly and buckling.

[0085] The rubber plug device includes a rubber plug 7 and a central shaft 8. The rubber plug 7 is arranged outside the central shaft 8 and above the central shaft 8. The rubber plug 7 is vulcanized and connected to the upper outer side of the central shaft 8. The rubber plug device also includes a locking ring 9. The outer side of the central shaft 8 is provided with a central shaft groove for accommodating the locking ring 9. When the central shaft 8 is in stable contact with the ball seat 10, the locking ring 9 in the central shaft groove matches the overshot groove inside the overshot 4 and the locking ring 9 is partially accommodated in the overshot groove. The central shaft 8 and the overshot 4 can be locked together by the locking ring 9. In some embodiments, the central shaft groove is arranged on the lower outer side of the central shaft 8. There can be multiple central shaft grooves and they are evenly arranged along the circumference of the central shaft 8. The number of central shaft grooves is the same as the number of overshot grooves of the overshot 4 and each central shaft groove accommodates a locking ring 9. Each locking ring 9 matches each central shaft groove with the corresponding overshot groove to lock it, thereby locking the central shaft 8 and the overshot 4 together, thereby locking the rubber plug device and the upper overshot device together.

[0086] The rubber plug device is mainly used to be put into the cementing process of the retrievable drill-free plug isolation cementing completion device of the present invention after the cementing process is completed to push the remaining cement slurry into the annulus between the retrievable drill-free plug isolation cementing completion device and the well wall to achieve the function of replacing cement.

[0087] In some embodiments, the shape of the outer side of the bottom of the central axis 8 matches the shape of the inner side of the top of the ball seat 10, so that the outer side of the bottom of the central axis 8 can stably contact the inner side of the top of the ball seat 10, so that the plug 7 is accommodated inside the overshot tube 4 and the outer wall of the plug 7 is tightly attached to the inner wall of the overshot tube 4.

[0088] When the salvageable drill-free plugging and cementing completion device of the present invention is in the initial state, the inner side of the lower part of the outer tube 1 is threadedly connected to the outer side of the upper part of the upper protective tube 16, the inner side of the lower part of the upper protective tube 16 is threadedly connected to the outer side of the upper part of the outer center tube 17, the outer side of the lower part of the outer center tube 17 is threadedly connected to the inner side of the upper part of the lower protective tube 22, the rubber tube 18 is sleeved on the outside of the outer center tube 17, the upper part of the rubber tube 18 is vulcanized and connected to the outer side of the lower part of the upper protective tube 16, and the lower part of the rubber tube 18 is vulcanized and connected to the outer side of the upper part of the lower protective tube 22. The outer side of the lower part of the lower protective tube 22 is threadedly connected to the inner side of the upper part of the lower joint 24. The closing tube 6 is located on the inner side of the outer tube 1 and abuts against the outer tube 1, and the closing tube long strip hole 11 of the closing tube 6 is fluidically connected to the liquid outlet hole 12 of the outer tube 1. The positioning piece boss 31 of the closing tube 6 abuts on the top boss 30 of the salvage tube 4. The inner side of the lower part of the overshot tube 4 is threadedly connected to the outer side of the upper part of the ball seat 10, and the inner side of the lower part of the ball seat 10 is threadedly connected to the outer side of the upper part of the connecting tube 14. The shear pin 13 releasably connects the ball seat 10 and the closing tube 6. The overshot tube elongated hole of the overshot tube 4 and the elongated hole 29 of the ball seat 10 are not fluidically connected with the closing tube elongated hole 11 of the closing tube 6. The inner side of the lower part of the inner center tube 15 is threadedly connected to the outer side of the middle and lower part of the plug 21, the first boss 33 of the upper inner part of the inner center tube 15 abuts on the connecting tube boss 34 of the lower outer part of the connecting tube 14, the second boss 35 of the upper outer part of the inner center tube 15 abuts on the lower boss 36 of the lower inner part of the closing tube 6, the third boss 38 of the lower outer part of the inner center tube 15 abuts below the outer center tube boss 28 of the middle and lower inner part of the outer center tube 17, and the liquid inlet hole 19 of the inner center tube 15 is connected with the liquid inlet valve 20 of the outer center tube 17. The position of the outer concave ring 40 of the plug 21 corresponds to the position of the third boss 38 .

[0089] refer to Figure 2 and Figure 4-7 The method for performing well completion operation using the salvageable drilling-free plugging and cementing completion device of the present invention, namely, the process method of the salvageable drilling-free plugging and cementing completion device, comprises the following steps:

[0090] Step 1, connecting the outer cylinder device, the closing cylinder 6, the upper bailing cylinder device, and the lower bailing cylinder device to form a bailed-out drill-free plugging and cementing completion device without a rubber plug device, and lowering the bailed-out drill-free plugging and cementing completion device without a rubber plug device into a predetermined position in the well using a casing string (not shown);

[0091] Step 2, inserting a first sealing ball into the inside of the retrievable drill-free plugging and cementing completion device without a rubber plug device and pumping fluid into it, the fluid enters the outer cylinder device through the liquid inlet hole 19 and the connecting gap 39, so that the outer cylinder device partially expands outward and finally contacts the well wall, thereby isolating the annulus between the outer cylinder device and the well wall;

[0092] Step 3, insert a second sealing ball into the inside of the removable drill-free plugging and cementing completion device without a rubber plug device and continue to pump fluid, so that the upper removable tube device is disconnected from the closing tube 6, and the upper removable tube device moves axially downward until the transverse through hole of the upper removable tube device, the transverse through hole of the closing tube 6 and the liquid outlet hole 12 of the outer tube device are fluidically connected, and cementing operations can be carried out according to the situation;

[0093] Step 4, inserting a rubber plug device into the inside of the retrievable drill-free plug isolation cementing completion device without a rubber plug device, and finally locking the rubber plug device to the upper retrieving tube device, waiting for cement to solidify;

[0094] Step 5, after the cement solidifies, lower the salvage tool into the well, and cooperate with the upper salvage tube device to salvage the upper salvage tube device, the lower salvage tube device and the rubber plug device, while the outer tube device and the closing tube 6 remain in the well.

[0095] In step 1, the formed retrievable drill-free plug isolation cementing completion device without a rubber plug device is a retrievable drill-free plug isolation cementing completion device in an initial state.

[0096] In step 2, the first sealing ball finally falls on the conical surface on the inner side of the upper part of the plug 21, and the pumped fluid passes through the liquid inlet hole 19, the connecting gap 39, and the liquid inlet valve 20 and enters between the outer center tube 17 and the rubber tube 18, so that the rubber tube 18 expands outward and finally contacts the well wall, thereby isolating the annulus between the rubber tube 18 and the well wall;

[0097] In step 3, the second sealing ball finally falls on the conical surface inside the ball seat 10. After the fluid is pumped in to make the pressure reach a certain value, the ball seat 10 cuts off the shear nail 13, and the ball seat 10 drives the connecting tube 14 and the overshot tube 4 to move downward. Finally, the bottom end of the ball seat 10 contacts the top end of the inner center tube 15, and the ball seat long hole 29 of the ball seat 10, the overshot tube long hole of the overshot tube 4, the closing tube long hole 11 of the closing tube 6 and the liquid outlet hole 12 of the outer tube 1 are fluidically connected, and cementing operations can be carried out according to the situation;

[0098] In step 4, the plug 7 and the center shaft 8 are inserted to push the cement downward, and finally the outer side of the bottom of the center shaft 8 contacts the inner side of the top of the ball seat 10, and the locking ring 9 locks the center shaft 8 and the overshot tube 4 together, and the outer wall of the plug 7 is tightly attached to the inner wall of the overshot tube 4, waiting for the cement to solidify;

[0099] In step 5, the salvage tool catches the reverse thread on the inner side of the top of the overshot tube 4, and the overshot tube 4 is lifted upward by the salvage tool to drive the rubber plug 7, the central axis 8, the ball seat 10, the connecting tube 14, the inner central tube 15, and the plug 21 to move upward together. When the top boss 30 on the outer side of the top of the overshot tube 4 moves to the positioning piece 3, it drives the closing tube 6 to move upward together. After the positioning piece 3 reaches the positioning groove 2, it stops moving upward, and the closing tube 6 closes the liquid outlet 12. Continue to lift the overshot tube 4, the rubber plug 7, the central axis 8, the ball seat 10, the connecting tube 14, the inner central tube 15, and the plug 21 until they are salvaged from the well, and the rest can be left in the well.

[0100] The retrievable drilling-free plugging and cementing completion device and the process method thereof of the present invention have the following advantages: retrievable, drilling-free, and high efficiency; large retrievable force, high reverse pressure bearing capacity, and good well control safety; composite materials can be used as a whole, and can also be drilled out; the inside and outside are connected during the lowering of the pipe column, automatic grouting can be realized, and the operation efficiency is high; during the operation, the ball is first thrown in to expand the sealing rubber cylinder 18, and finally the ball is thrown in to open the liquid outlet 12, so as to avoid misoperation.

[0101] The above embodiments only express the implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention.

Claims

1. A fishable drilling-free plugging and cementing completion device, characterized in that: The utility model comprises an outer cylinder device, a closing cylinder, an upper canister device, a lower canister device and a rubber plug device, wherein the closing cylinder is located inside the outer cylinder device, the upper canister device is located inside the closing cylinder and is releasably connected to the closing cylinder, the lower canister device is inside the outer cylinder device and is located below the upper canister device and the closing cylinder, the lower canister device is respectively in contact with the closing cylinder, the upper canister device and the outer cylinder device, and the rubber plug device can be arranged inside the upper canister device. The closing cylinder is configured to be axially movable relative to the outer cylinder device, and has a pressing position abutting against the outer cylinder device and a clamping position clamping against the outer cylinder device. When the closing cylinder is in the pressing position, the transverse through hole provided on the closing cylinder is in fluid communication with the liquid outlet hole provided on the outer cylinder device. When the closing cylinder is in the clamping position, the transverse through hole provided on the closing cylinder is not in fluid communication with the liquid outlet hole. When the upper canister device is connected to the closing tube, the transverse through hole of the upper canister device is not in fluid communication with the transverse through hole of the closing tube, and when the upper canister device is disconnected from the closing tube, the upper canister device can be axially moved downward so that the transverse through hole of the upper canister device is in fluid communication with the transverse through hole of the closing tube; A connecting gap is formed between the outer tube device, the closing tube and the lower scoop device, and the fluid can enter the outer tube device through the liquid inlet hole on the lower scoop device and the connecting gap to cause the outer tube device to partially expand outward to achieve sealing.

2. The salvageable drilling-free plugging and cementing completion device according to claim 1 is characterized in that: It also includes a lower joint, which is threadedly connected to the outer cylinder device below the outer cylinder device.

3. The salvageable drilling-free plugging and cementing completion device according to claim 2 is characterized in that: The outer cylinder device includes an outer cylinder, an upper protective cylinder, an outer center cylinder, a rubber cylinder and a lower protective cylinder. The outer cylinder, the upper protective cylinder, the outer center cylinder and the lower protective cylinder are threadedly connected in sequence. The rubber cylinder is sleeved on the outside of the outer center cylinder. The upper part of the rubber cylinder is vulcanized and connected to the outer side of the lower part of the upper protective cylinder. The lower part of the rubber cylinder is vulcanized and connected to the outer side of the upper part of the lower protective cylinder. The lower protective cylinder is threadedly connected to the lower joint. The liquid outlet is arranged on the outer cylinder.

4. The salvageable drilling-free plugging and cementing completion device according to claim 3 is characterized in that: A positioning groove for positioning the closing cylinder is arranged on the inner side of the upper portion of the outer cylinder.

5. The salvageable drilling-free plugging and cementing completion device according to claim 3 is characterized in that: A coupling portion for coupling with the sleeve is arranged on the inner side of the top of the outer cylinder.

6. The salvageable drilling-free plugging and cementing completion device according to claim 3 is characterized in that: An outer cylinder boss is disposed on the inner side of the outer cylinder, and a closing cylinder boss is disposed on the outer side of the closing cylinder. When the closing cylinder is in the tightening position, the closing cylinder boss abuts against the outer cylinder boss.

7. The salvageable drilling-free plugging and cementing completion device according to claim 3 is characterized in that: The outer center tube is provided with a threaded countersunk hole, and the liquid inlet valve is located in the threaded countersunk hole and is threadedly connected to the threaded countersunk hole. The fluid entering through the liquid inlet hole on the lower scoop device can enter the gap between the outer center tube and the rubber cylinder through the connecting gap and the liquid inlet valve to cause the rubber cylinder to expand outward.

8. The salvageable drilling-free plugging and cementing completion device according to claim 3 is characterized in that: An outer center tube boss is arranged on the inner side of the outer center tube, and the outer center tube boss abuts against the lower scoop device.

9. The salvageable drilling-free plugging and cementing completion device according to claim 1 is characterized in that: A positioning piece and a cutting groove are arranged on the upper part of the closing cylinder. The positioning piece is formed when the cutting groove is cut and is located above the cutting groove. The positioning piece is used to position the closing cylinder on the outer cylinder device.

10. The salvageable drilling-free plugging and cementing completion device according to claim 8, characterized in that: The closing tube is releasably connected to the upper bucket device via shear pins.

11. The salvageable drilling-free plugging and cementing completion device according to claim 10, characterized in that: The upper salvage tube device includes a salvage tube, a ball seat and a connecting tube which are threadedly connected in sequence. The transverse through hole of the upper salvage tube device includes a salvage tube elongated hole arranged on the salvage tube and a ball seat elongated hole arranged on the ball seat. The positions of the salvage tube elongated hole and the ball seat elongated hole correspond to each other. The lower part of the ball seat is releasably connected to the closing tube through the shear nail.

12. The salvageable drilling-free plugging and cementing completion device according to claim 11, characterized in that: A top boss is arranged on the outer side of the top of the overshot tube, which is used to limit the upward movement of the closing tube.

13. The salvageable drilling-free plugging and cementing completion device according to claim 11, characterized in that: The inner side of the top of the overshot tube is provided with a reverse thread for cooperating with a fishing tool.

14. The salvageable drilling-free plugging and cementing completion device according to claim 11, characterized in that: The inner side of the ball seat is provided with a conical surface which can cooperate with the second sealing ball.

15. The salvageable drilling-free plugging and cementing completion device according to claim 11, characterized in that: The lower scoop device includes an inner center tube and a plug, the inner side of the lower portion of the inner center tube is threadedly connected to the outer side of the plug, the first boss arranged on the inner side of the upper portion of the inner center tube abuts against the connecting tube boss arranged on the outer side of the lower portion of the connecting tube, the second boss arranged on the outer side of the upper portion of the inner center tube abuts against the lower boss on the inner side of the lower portion of the closing tube, and the liquid inlet hole on the lower scoop device is arranged on the inner center tube.

16. The salvageable drilling-free plugging and cementing completion device according to claim 15, characterized in that: The third boss arranged on the outer side of the inner center tube abuts against the lower side of the outer center tube boss on the inner side of the outer center tube, and the connecting gap is formed between the outer side of the inner center tube, the bottom end of the closing tube, the inner side of the outer center tube and the inner side of the upper protective tube.

17. The salvageable drilling-free plugging and cementing completion device according to claim 16, characterized in that: A concave ring is provided on the outside of the plug, and the concave ring is circumferentially distributed on the outside of the plug. When the plug and the inner center tube are threadedly connected, the position of the concave ring corresponds to the position of the third boss, so that when the third boss is retracted by a force, it is accommodated by the concave ring to offset the effect of the force.

18. The salvageable drilling-free plugging and cementing completion device according to claim 11, characterized in that: The rubber plug device comprises a rubber plug and a central shaft. The rubber plug is arranged outside and above the central shaft, and the rubber plug is vulcanized and connected to the outer side of the upper part of the central shaft.

19. The salvageable drilling-free plugging and cementing completion device according to claim 18, characterized in that: The rubber plug device also includes a locking ring. A central shaft groove for accommodating the locking ring is arranged outside the central shaft, and a salvage tube groove for accommodating the locking ring is arranged inside the salvage tube. The central shaft and the salvage tube can be locked together through the locking ring.

20. A method for performing well completion operations using the salvageable drill-free plugging and cementing completion device according to any one of claims 1 to 19, comprising the following steps: Step 1, connecting the outer cylinder device, the closing cylinder, the upper bailing cylinder device, and the lower bailing cylinder device to form a bailed-out drill-free plugging and cementing completion device without a rubber plug device, and lowering the bailed-out drill-free plugging and cementing completion device without a rubber plug device into a predetermined position in the well using a casing string; Step 2, inserting a first sealing ball into the inside of the retrievable drill-free plugging and cementing completion device without a rubber plug device and pumping a fluid, wherein the fluid enters the outer cylinder device through the liquid inlet hole and the connecting gap, so that the outer cylinder device partially expands outward and finally contacts the well wall, thereby isolating the annulus between the outer cylinder device and the well wall; Step 3, inserting a second sealing ball into the inside of the retrievable drill-free plugging and cementing completion device without the rubber plug device and continuing to pump fluid, so that the upper retrievable tube device is disconnected from the closing tube, and the upper retrievable tube device is axially moved downward until the transverse through hole of the upper retrievable tube device, the transverse through hole of the closing tube and the fluid outlet of the outer tube device are fluidically connected, and cementing operations can be carried out according to the situation; Step 4, inserting the rubber plug device into the inside of the retrievable drill-free plug isolation cementing completion device without the rubber plug device, and finally locking the rubber plug device to the upper bailing tube device, waiting for cement to solidify; Step 5, after the cement solidifies, a salvage tool is lowered to cooperate with the upper salvage tube device to salvage the upper salvage tube device, the lower salvage tube device and the rubber plug device, and the outer tube device and the closing tube are left in the well.

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