Auxiliary installation device for blowout prevention tool in cross-core fishing coiled tubing and operation method

After cutting and salvage the oil pipe through the heart, the auxiliary installation device of the anti-blasting tool in the continuous oil pipe in the heart-salvage continuous oil pipe is solved, and the safety of well control and the smooth launch of the continuous oil pipe is achieved.

CN119616410APending Publication Date: 2025-03-14CHINA NAT PETROLEUM CORP +1
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Patent Information

Application Number
CN202311180529.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2023-09-13
Publication Date
2025-03-14

AI Technical Summary

Technical Problem

After the oil pipe is cut through the heart to salvage the continuous oil pipe, the oil and gas in the wellbore overflow from the oil pipe and the inner cavity of the continuous oil pipe, resulting in the risk of well control or blowout out of control.

Method used

An auxiliary installation device for preventing spray tool in the penetration continuous oil pipe is adopted, including a lifting device and a suspension device. Through the combination of the slider spear and suction rod coupling, it is closely attached to the inner wall of the continuous oil pipe to avoid oil and gas overflow, and the wellhead pressure is controlled through the oil pipe plug valve.

Benefits of technology

It effectively avoids oil and gas overflow in the well, reduces the risk of well control and blowout out, and ensures the safety of the wellhead and the smooth launch of continuous oil pipes.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention relates to the technical field of oil pipe core-penetrating cutting and fishing coiled tubing operation tools, in particular to an auxiliary installation device for a blowout prevention tool in a core-penetrating fishing coiled tubing and an operation method.The device comprises a lifting device and a hanging device, and the lifting device comprises a lifting rod, a bearing block and a lifting baffle; the lifting rod, the bearing block and the lifting baffle are sequentially fixed together from top to bottom, a bearing disc is arranged on the outer side of the bearing block, a vertically-through circulating channel is distributed on the bearing disc, and the hanging device comprises a horn limiting sleeve, a connecting short section, a sucker rod coupling and a sliding block spear rod. When oil gas in a shaft overflows from the oil pipe and an inner cavity of the coiled tubing in the operation process of lifting the coiled tubing or sleeving the coiled tubing after the coiled tubing is fished by the oil pipe through cutting, the sucker rod coupling and the sliding block spear rod are rapidly installed, and meanwhile, the oil pipe plug valve is rapidly installed to close a well; and well control dangerous cases caused by the fact that oil gas slipping and moving upwards from the inner cavity of the coiled tubing is sprayed out of the drill floor surface from the tubing and the inner cavity of the coiled tubing are avoided.
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Description

Technical Field

[0001] The invention relates to the technical field of oil pipe cutting and salvaging coiled oil pipe operation tools, and is an auxiliary installation device and an operation method for a blowout prevention tool in a coiled oil pipe. Background Art

[0002] At present, when the coiled tubing is cut through the tubing to salvage the coiled tubing, the annulus between the tubing and the casing is sealed with a tubing semi-sealed blowout preventer, and the tubing is controlled by a plug valve or a blowout preventer gate. However, after the coiled tubing is cut and salvaged, the coiled tubing, the tubing and the casing are in a connected state, and the oil and gas in the wellbore enter the tubing and the inner cavity of the coiled tubing. It is difficult to install the internal blowout preventer after the overflow is found, which can easily cause a catastrophic accident of uncontrolled blowout. The conventional practice is to circulate degassing or well pressure the wellbore after the coiled tubing is cut and salvaged, and the coiled tubing is pulled out after the wellbore is stable. However, due to the small cross-sectional area of ​​the coiled tubing (inner diameter 42mm), when the coiled tubing is pulled up or the coiled tubing is pulled up, the gas in the pipe is easy to slip and rush up to the wellhead, and spray out of the tubing and the inner cavity of the coiled tubing to the drilling floor, causing well control danger or uncontrolled blowout, and there is a great well control safety risk. Summary of the invention

[0003] The present invention provides an auxiliary installation device and an operating method for a blowout prevention tool in a core-penetrating salvaging coiled tubing, which overcomes the shortcomings of the above-mentioned prior art and can effectively prevent oil and gas in the well from overflowing from the tubing and the inner cavity of the coiled tubing when the coiled tubing is salvaged or sleeved, thereby avoiding the occurrence of well control dangers or uncontrolled blowouts.

[0004] One of the technical solutions of the present invention is achieved through the following measures: an auxiliary installation device for a blowout prevention tool in a through-hole salvage continuous oil pipe, including a lifting device and a hanging device, the lifting device including a lifting rod, a load-bearing block and a lifting baffle, the lifting rod, the load-bearing block and the lifting baffle are fixed together in sequence from top to bottom, a load-bearing plate is arranged on the outside of the load-bearing block, and a circulation channel which passes through the load-bearing plate from top to bottom is distributed, the hanging device includes a trumpet limit sleeve, a connecting short section, a sucker rod coupling and a slider spear rod, the trumpet limit sleeve and the connecting short section are fixedly connected together from top to bottom, a hanging step is arranged on the inner side of the connecting short section, the load-bearing plate is seated on the hanging step, the lower part of the load-bearing block is fixedly connected to the slider spear rod through the sucker rod coupling, and a slider spear tooth which can be firmly attached to the inner wall of the continuous oil pipe is fixedly installed on the outer side of the lower part of the slider spear rod.

[0005] The following is a further optimization and / or improvement of one of the above-mentioned technical solutions: The outer side of the lower part of the slider lance rod is provided with a clamping groove, the slider lance tooth is clamped in the clamping groove, and the outer side of the slider lance tooth is provided with a clamping tooth extending out of the clamping groove.

[0006] The contact surface between the outer side of the load-bearing plate and the hanging step is interference fit.

[0007] The speaker limiting sleeve and the connecting short section are connected via threads.

[0008] The diameter of the lifting baffle is larger than the hole diameter of the sucker rod elevator; the length of the lifting rod is longer than the thickness of the sucker rod elevator.

[0009] The maximum outer diameter of the slider lance is 3 mm smaller than the inner diameter of the coiled tubing.

[0010] The second technical solution of the present invention is achieved through the following measures: an operating method of an auxiliary installation device for a blowout prevention tool for core-penetrating and salvaging a continuous oil pipe, comprising: after the continuous oil pipe is core-penetrated and cut, during the operation of lifting the continuous oil pipe or sleeve-lifting the continuous oil pipe, the horn limit sleeve of the suspension device, the connecting short section and the oil pipe coupling are connected in sequence from top to bottom through threads; when the oil and gas in the wellbore overflow from the oil pipe and the inner cavity of the continuous oil pipe, the horn limit sleeve on the connecting short section is removed, the slider lance rod is extended from the upper end of the continuous oil pipe into the inner cavity of the continuous oil pipe until the slider lance rod is fully extended into the continuous oil pipe, and the slider lance rod is fixedly connected to the load-bearing block through the sucker rod coupling Then, when the lifting rod is lifted, the slider spear teeth move downward relatively, and the slider spear teeth are tightly attached to the inner wall of the coiled tubing through the axial force, so that the load of the recovered coiled tubing is completely suspended on the load-bearing block through the slider spear teeth; then the tubing plug valve is installed on the connecting short joint and the tubing coupling through a threaded buckle, and the tubing plug valve is closed to prevent the oil and gas that slips up from the inner cavity of the coiled tubing from spraying out of the tubing and the inner cavity of the coiled tubing to the drilling floor and causing a well control hazard. In the later circulating degassing operation, the tubing plug valve is opened, and the circulating fluid or well killing fluid is circulated through the circulating channel on the load-bearing block for degassing or well killing. After the wellbore is stable, the recovered coiled tubing is smoothly pulled out.

[0011] When the coiled tubing is salvaged by cutting through the tubing core and then raised or sleeved, if it is found that oil and gas in the wellbore overflow from the tubing and the inner cavity of the coiled tubing, a sucker rod coupling and a slider lance are quickly installed, and at the same time, a tubing plug valve is quickly installed to shut in the well, so as to avoid a well control hazard caused by oil and gas slipping and rising from the inner cavity of the coiled tubing and spraying out of the drilling platform from the tubing and the inner cavity of the coiled tubing. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Attached Figure 1 This is a schematic diagram of the perspective structure of the main view of the auxiliary installation device for the blowout prevention tool in the core-penetrating salvage coiled tubing of the present invention.

[0013] The codes in the attached drawings are: 1 is a lifting rod, 2 is a load-bearing block, 3 is a lifting baffle, 4 is a load-bearing plate, 5 is a trumpet limit sleeve, 6 is a connecting short section, 7 is a sucker rod coupling, 8 is a slider lance rod, 9 is a hanging step, and 10 is a slider lance tooth. DETAILED DESCRIPTION

[0014] The present invention is not limited by the following embodiments, and specific implementation methods can be determined based on the technical solution of the present invention and actual conditions.

[0015] In the present invention, for the convenience of description, the relative position relationship of each component is described according to the attached Figure 1 The layout is described in detail, such as the positional relationship of front, back, top, bottom, left, right, etc., which is based on the attached manual. Figure 1 The layout direction is determined by the

[0016] The present invention will be further described below in conjunction with embodiments: Embodiment 1: As attached Figure 1 As shown, the auxiliary installation device for the blowout prevention tool in the through-hole salvage continuous oil pipe includes a lifting device and a hanging device. The lifting device includes a lifting rod 1, a bearing block 2 and a lifting baffle 3. The lifting rod 1, the bearing block 2 and the lifting baffle 3 are fixed together in sequence from top to bottom. A bearing plate 4 is arranged on the outer side of the bearing block 2. A circulation channel that passes through from top to bottom is distributed on the bearing plate 4. The hanging device includes a trumpet limit sleeve 5, a connecting short section 6, a sucker rod coupling 7 and a slider lance rod 8. The trumpet limit sleeve 5 and the connecting short section 6 are fixedly connected together from top to bottom, a hanging step 9 is arranged on the inner side of the connecting short section 6, the bearing plate 4 is seated on the hanging step 9, the lower part of the bearing block 2 is fixedly connected to the slider lance rod 8 through the sucker rod coupling 7, and a slider lance tooth 10 that can be firmly attached to the inner wall of the continuous oil pipe is fixedly installed on the outer side of the lower part of the slider lance rod 8.

[0017] The maximum outer diameter of the slider lance 8 is 3 mm smaller than the inner diameter of the coiled tubing. After the slider lance teeth 10 on the slider lance 8 move downward, the maximum outer diameter at the bottom is 2 mm larger than the inner diameter of the coiled tubing, which makes it easier for the slider lance 8 to extend into the inner cavity of the coiled tubing. At the same time, after the slider lance teeth 10 move downward, they can be tightly attached to the inner wall of the coiled tubing through the action of axial force.

[0018] The lifting rod 1, the load-bearing block 2 and the lifting baffle 3 can be connected as one; the slider lance 8 can adopt a Φ38mm slider lance, and the sucker rod coupling 7 can adopt a Φ25.4mm sucker rod coupling.

[0019] The auxiliary installation device for blowout prevention tools in core-penetrating fishing coiled tubing of the present invention has the following characteristics during operation: (1) When lifting or rigging the coiled tubing after cutting and salvaging, the internal blowout prevention tool (tubing plug valve) can be installed immediately to avoid the well control risk of oil and gas in the wellbore blowing out through the tubing and the inner cavity of the coiled tubing.

[0020] (2) Circulation degassing or well killing operations can be performed through the circulation channel on the load-bearing block 2 to ensure the subsequent safe removal of the coiled tubing.

[0021] (3) Easy to install and disassemble, which can quickly shut down the well and avoid catastrophic safety accidents such as uncontrolled blowouts.

[0022] The following is a further optimization and / or improvement of the auxiliary installation device for the blowout prevention tool in the core-penetrating fishing coiled tubing: Embodiment 2: As attached Figure 1 As shown, as an optimization of the above embodiment, a slot is provided on the outer side of the lower part of the slider lance 8, the slider lance tooth 10 is mounted in the slot, and a tooth extending out of the slot is provided on the outer side of the slider lance tooth 10.

[0023] Embodiment 3: As required, as an optimization of the above embodiment, the contact surface between the outer side of the load-bearing plate 4 and the suspension step 9 is an interference fit.

[0024] Through interference fit, the load-bearing block 2 can be conveniently suspended on the upper end of the suspension step 9, and cyclic degassing or well killing can be achieved.

[0025] Embodiment 4: As required, as an optimization of the above embodiment, the speaker limiting sleeve 5 and the connecting short section 6 are connected by threads.

[0026] Embodiment 5: As required, as an optimization of the above embodiment, the diameter of the lifting baffle 3 is larger than the hole diameter of the sucker rod elevator; the length of the lifting rod 1 is longer than the thickness of the sucker rod elevator.

[0027] Embodiment 6: An operating method for implementing the auxiliary installation device for the blowout prevention tool in the core-penetrating and fishing coiled tubing described in the above embodiment, comprising: after the coiled tubing is core-penetrated and cut, during the operation of lifting or sleeve-lifting the coiled tubing, the horn limit sleeve 5, the connecting short section 6 and the tubing coupling of the suspension device are connected in sequence from top to bottom through threads; when the oil and gas in the wellbore overflow from the tubing and the inner cavity of the coiled tubing, the horn limit sleeve 5 on the connecting short section 6 is removed, the slider lance rod 8 is extended from the upper end of the coiled tubing into the inner cavity of the coiled tubing until the slider lance rod 8 is fully extended into the coiled tubing, the slider lance rod 8 is fixedly connected to the load-bearing block 2 through the sucker rod coupling 7, and the upper When the lifting rod 1 is lifted, the slider lance 10 moves downward relatively, and the slider lance 10 is tightly attached to the inner wall of the coiled tubing through the axial force, so that the load of the fished coiled tubing is completely suspended on the bearing block 2 through the slider lance 10; then the tubing plug valve is installed on the connecting short section 6 and the tubing coupling, and the tubing plug valve is closed to prevent the oil and gas that slips up from the inner cavity of the coiled tubing from spraying out of the tubing and the inner cavity of the coiled tubing to the drilling floor and causing a well control hazard. During the later circulating degassing operation, the tubing plug valve is opened, and the circulating fluid or well killing fluid is circulated through the circulating channel on the bearing block 2 for degassing or well killing, and the fished coiled tubing is smoothly pulled out after the wellbore is stable.

[0028] At the overhaul site, when the coiled tubing is salvaged after the tubing is cut through the core and salvaged, or during the operation of pulling up the coiled tubing or sleeve-up the coiled tubing, if it is found that oil and gas in the wellbore are overflowing from the tubing and the inner cavity of the coiled tubing, the sucker rod coupling 7, the slider lance 8, the bearing block 2, the bearing plate 4, the lifting rod 1, and the lifting baffle 3 of the auxiliary installation device of the blowout prevention tool in the coiled tubing salvage are quickly installed, and the tubing plug valve is installed at the same time to shut in the well, so as to avoid the oil and gas that slips up from the inner cavity of the coiled tubing and sprays out of the drilling floor from the tubing and the inner cavity of the coiled tubing, which may cause a well control hazard.

[0029] The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the requirements of different situations.

Claims

1. A blowout prevention tool auxiliary installation device for core-penetrating fishing coiled tubing, characterized in that It includes a lifting device and a suspension device. The lifting device includes a lifting rod, a load-bearing block and a lifting baffle. The lifting rod, the load-bearing block and the lifting baffle are fixed together in sequence from top to bottom. A load-bearing plate is arranged on the outer side of the load-bearing block. A circulation channel that passes through from top to bottom is distributed on the load-bearing plate. The suspension device includes a trumpet limit sleeve, a connecting short section, a sucker rod coupling and a slider spear rod. The trumpet limit sleeve and the connecting short section are fixedly connected together from top to bottom. A hanging step is arranged on the inner side of the connecting short section. The load-bearing plate is seated on the hanging step. The lower part of the load-bearing block is fixedly connected to the slider spear rod through the sucker rod coupling. The outer side of the lower part of the slider spear rod is fixedly installed with a slider spear tooth that can be firmly attached to the inner wall of the continuous oil pipe.

2. The auxiliary installation device for blowout prevention tools in core-penetrating fishing coiled tubing according to claim 1 is characterized in that A clamping groove is arranged on the outer side of the lower part of the slider lance rod, the slider lance tooth is clamped in the clamping groove, and a clamping tooth extending out of the clamping groove is arranged on the outer side of the slider lance tooth.

3. The auxiliary installation device for blowout prevention tools in core-penetrating fishing coiled tubing according to claim 1 or 2, characterized in that The contact surface between the outer side of the load-bearing plate and the hanging step is interference fit.

4. The auxiliary installation device for blowout prevention tools in core-penetrating fishing coiled tubing according to claim 1 or 2, characterized in that The speaker limiting sleeve and the connecting short section are connected by threads.

5. The auxiliary installation device for blowout prevention tools in core-penetrating fishing coiled tubing according to claim 3 is characterized in that The speaker limiting sleeve and the connecting short section are connected by threads.

6. The auxiliary installation device for blowout prevention tools in core-penetrating fishing coiled tubing according to claim 1 or 2, characterized in that The diameter of the lifting baffle is larger than the hole diameter of the sucker rod elevator; the length of the lifting rod is longer than the thickness of the sucker rod elevator.

7. The auxiliary installation device for blowout prevention tools in core-penetrating fishing coiled tubing according to claim 3 is characterized in that The diameter of the lifting baffle is larger than the hole diameter of the sucker rod elevator; the length of the lifting rod is longer than the thickness of the sucker rod elevator.

8. The auxiliary installation device for blowout prevention tools in core-penetrating fishing coiled tubing according to claim 4 is characterized in that The diameter of the lifting baffle is larger than the hole diameter of the sucker rod elevator; the length of the lifting rod is longer than the thickness of the sucker rod elevator.

9. The auxiliary installation device for blowout prevention tools in core-penetrating fishing coiled tubing according to claim 5 is characterized in that The diameter of the lifting baffle is larger than the hole diameter of the sucker rod elevator; the length of the lifting rod is longer than the thickness of the sucker rod elevator.

10. An operating method for implementing the auxiliary installation device for blowout prevention tools in core-penetrating fishing coiled tubing according to any one of claims 1 to 9, characterized in that After the tubing is cut through the heart and the coiled tubing is fished out, during the operation of pulling up the coiled tubing or sleeve pulling up the coiled tubing, the horn limit sleeve of the suspension device, the connecting short section and the tubing coupling are connected in sequence from top to bottom through threads; when the oil and gas in the wellbore overflow from the tubing and the inner cavity of the coiled tubing, the horn limit sleeve on the connecting short section is removed, the slider spear rod is extended from the upper end of the coiled tubing into the inner cavity of the coiled tubing until the slider spear rod is fully extended into the coiled tubing, the slider spear rod is fixedly connected to the bearing block through the sucker rod coupling, and when the lifting rod is lifted, the slider spear teeth move downward relatively, and the slider spear teeth pass through the shaft The oil pipe is tightly attached to the inner wall of the coiled tubing by the force acting on it, so that the load of the recovered coiled tubing is completely suspended on the bearing block through the slider spear teeth; then the tubing plug valve is installed on the connecting short joint and the tubing coupling through a threaded buckle, and the tubing plug valve is closed to prevent the oil and gas from slipping out of the inner cavity of the coiled tubing from spraying out of the tubing and the inner cavity of the coiled tubing to the drilling floor, which may cause a well control hazard. In the later circulating degassing operation, the tubing plug valve is opened, and the circulating fluid or well killing fluid is circulated through the circulating channel on the bearing block for degassing or well killing. After the wellbore is stable, the recovered coiled tubing is smoothly pulled out.