Coiled tubing cross-core casing milling fishing device and method
By designing a continuous oil pipe penetration and milling device, the continuous oil pipe under the drilling platform plane is connected to the continuous oil pipe under the drilling platform, the problem of jamming and blocking of the continuous oil pipe is solved, and a fast and reliable salvage effect is achieved.
Patent Information
- Application Number
- CN202510035804.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-09
- Publication Date
- 2025-04-18
AI Technical Summary
During the continuous oil pipe drilling and plugging process, obstacle jamming often occurs, and it is difficult for the prior art to quickly and reliably release the obstacle jamming.
A continuous oil pipe penetration and milling device is designed, including wire rope, sleeve milling pipe, upper and lower connectors, C-type chuck, oil pipe joint, etc., and is connected to the continuous oil pipe under the drilling platform plane by the penetration and milling pipe, and the sleeve milling pipe is used to cooperate with the extended rod to achieve sleeve milling and salvage.
This device can quickly and reliably remove the clamping of the continuous oil pipe, with a fast salvage speed, and is not prone to sand clamping pipe milling, and has a fast sand flushing speed.
Smart Images
Figure CN119844025A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of coiled tubing unstuck salvage, and more specifically to a coiled tubing core milling salvage device and method. Background Art
[0002] Domestic gas wells, shale gas wells and horizontal wells are generally operated with coiled tubing. In recent years, various oil and gas fields have experienced varying degrees of stuck accidents during the process of connecting coiled tubing and drilling plugs. Shale gas fields have experienced multiple coiled tubing stuck phenomena during the production process of coiled tubing drilling plugs and speed strings.
[0003] At present, the main methods for dealing with continuous tubing jams on site include: 1. Active unblocking, positive and negative pressure injection of oil casing, positive injection of liquid nitrogen lift, etc. Some wells can be unblocked, but some wells with serious jams cannot achieve the purpose of unblocking the oil pipeline through the above methods; 2. Cutting and salvaging methods, which have a long construction period and many uncertain factors. Summary of the invention
[0004] The technical problem to be solved by the present invention is to provide a coiled tubing core milling and salvaging device and method, which can salvage all stuck coiled tubing at one time, with fast salvage speed and high reliability.
[0005] The technical solution adopted by the present invention to solve its technical problems is: construct a continuous oil pipe through-core milling salvage device, including a wire rope, a blowout preventer, a faucet, a milling pipe, an upper wire rope connector, a lower wire rope connector, a C-type chuck, an oil pipe coupling, an elevator, an extension rod and a connector, the wire rope passes through the milling pipe and is connected with the upper wire rope connector, the blowout preventer is installed at the top of the milling pipe, the faucet is installed at the upper part of the milling pipe, the lower part of the upper wire rope connector is connected with the lower wire rope connector, the lower wire rope connector is seated on the C-type chuck, the C-type chuck clamps the extension rod on the oil pipe coupling, the oil pipe coupling is seated on the elevator, the elevator is seated on the drilling platform plane, the continuous oil pipe located below the drilling platform plane is connected to the extension rod through the connector, and the milling pipe is connected to the extension rod in the oil pipe coupling.
[0006] According to the above scheme, the faucet is connected to the inlet and outlet water pipes, and the inlet and outlet water pipes are communicated with the sleeve milling pipe.
[0007] According to the above scheme, the upper wire rope connector includes an upper cylinder, a slip and a lower joint. The lower end of the wire rope is inserted into the upper cylinder and clamped by the slip, and the lower wire rope connector is connected to the lower joint. According to the above scheme, an adjusting gasket ring is provided on the outer side of the slip, and the tightness of the slip is adjusted by adjusting the gasket ring. The present invention also provides a coiled tubing core-penetrating milling salvage method, which uses the coiled tubing core-penetrating milling salvage device, comprising the following steps: S1, cutting coiled tubing at the wellhead; S2. Install the coiled tubing connector, extension rod and lower part of the wire rope connector; S3. Install wellhead blowout prevention equipment, including annular blowout preventer, double gate blowout preventer, wellhead main valve, wellhead and casing; S4, pass the steel wire rope through the milling pipe to connect it with the coiled tubing below the drilling platform plane; S5. When the casing milling pipe encounters resistance, close the annular blowout preventer; S6. After the casing milling pipe is connected to the coiled tubing below the drilling platform plane, the well is circulated and sand is flushed; S7, after unblocking, pull out the coiled tubing below the drilling platform plane; S8. Lift out the sand flushing oil pipe. According to the above scheme, step S4 includes the following steps: S41. Pass the steel wire rope through the casing milling pipe; S42. The crane and the workover rig cooperate to lift the casing milling pipe and the steel wire rope; S43. Connect the upper steel wire rope connector with the lower steel wire rope connector; S44. Lift a certain load; S45. Remove the C-type chuck; S46. The workover rig lowers the casing milling pipe seat in the tubing collar; S47. Use hydraulic pliers to buckle; S48. The workover rig lowers the casing milling pipe seat on the drilling platform; S49. The C-type chuck clamps the extension rod seat on the tubing collar; S410. Lower the steel wire rope so that the lower steel wire rope connector is seated on the C-type chuck; S411. Remove the upper steel wire rope connector and the lower steel wire rope connector. According to the above scheme, in step S4, a sawtooth sandblasting head is connected to the bottom of the milling pipe.
[0008] According to the above solution, in step S4, the bottom of the milled pipe is sleeved with a non-coupling oil pipe.
[0009] According to the above scheme, in step S4, the coiled tubing is unblocked by using the casing backwashing sand method.
[0010] The coiled tubing core milling and fishing device and method of the present invention have the following beneficial effects: 1. The present invention uses through-core milling for salvage, and the coiled tubing falls at the wellhead, which will not cause the fish top to be lost.
[0011] 2. The present invention adopts reverse circulation sleeve milling, which makes it less likely for sand to get stuck in the sleeve milling pipe, and the sand flushing speed is faster.
[0012] 3. After the sleeve milling is completed, the present invention can fish out all the stuck coiled tubing at one time, and has the advantages of fast fishing speed and high reliability. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which: Figure 1 It is a structural schematic diagram of the coiled tubing core-penetrating sleeve milling and fishing device of the present invention; Figure 2 It is a structural schematic diagram of the wellhead blowout prevention equipment; Figure 3 It is a structural schematic diagram of an upper wire rope connector and a lower wire rope connector. DETAILED DESCRIPTION
[0014] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described in detail with reference to the accompanying drawings.
[0015] like Figure 1-3 As shown, the coiled tubing core milling and salvaging device of the present invention comprises a wire rope 1, a blowout preventer box 2, a faucet 3, a milling pipe 5, an upper wire rope connector 6, a lower wire rope connector 7, a C-type chuck 8, a tubing coupling 9, a hanging card 10, an extension rod and a connector 12.
[0016] The wire rope 1 passes through the casing milling tube 5 and is connected to the upper wire rope connector 6. The blowout preventer 2 is installed on the top of the casing milling tube 5. The faucet 3 is installed on the upper part of the casing milling tube 5. The lower part of the upper wire rope connector 6 is connected to the lower wire rope connector 7. The lower wire rope connector 7 is seated on the C-type chuck 8. The C-type chuck 8 clamps the extension rod on the oil pipe coupling 9. The oil pipe coupling 9 is seated on the elevator 10. The elevator 10 is seated on the drilling platform plane 11. The continuous oil pipe 13 located below the drilling platform plane 11 is connected to the extension rod through the connector 12, and the casing milling tube 5 is connected to the extension rod in the oil pipe coupling 9.
[0017] Preferably, the faucet 3 is connected to the water inlet and outlet pipes 4 , and the water inlet and outlet pipes 4 are communicated with the sleeve milling pipe 5 .
[0018] Preferably, Figure 3 As shown, the upper wire rope connector 6 includes an upper cylinder 19 , a slip 20 and a lower joint 22 . The lower end of the wire rope 1 is inserted into the upper cylinder 19 and clamped by the slip 20 , and the lower wire rope connector 7 is connected to the lower joint 22 .
[0019] An adjusting washer 21 is provided on the outer side of the slip 20 , and the tightness of the slip 20 can be adjusted by adjusting the washer 21 . The present invention discloses a coiled tubing core-penetrating milling salvage method, which adopts a coiled tubing core-penetrating milling salvage device, and comprises the following steps: S1, cutting coiled tubing at the wellhead; S2. Install the coiled tubing connector, extension rod and lower part of the wire rope connector; S3, installing wellhead blowout prevention equipment, including annular blowout preventer 14, double gate blowout preventer 15, wellhead main valve 16, wellhead 17 and casing 18; S4, pass the steel wire rope through the milling pipe to connect it with the coiled tubing below the drilling platform plane; S5. When the casing milling pipe encounters resistance, close the annular blowout preventer; S6. After the casing milling pipe is connected to the coiled tubing below the drilling platform plane, the well is circulated and sand is flushed; S7, after unblocking, pull out the coiled tubing below the drilling platform plane; S8. Lift out the sand flushing oil pipe.
[0020] Preferably, step S4 comprises the following steps: S41. Pass the steel wire rope through the casing milling pipe; S42. The crane and the workover rig cooperate to lift the casing milling pipe and the steel wire rope; S43. Connect the upper steel wire rope connector with the lower steel wire rope connector; S44. Lift a certain load; S45. Remove the C-type chuck; S46. The workover rig lowers the casing milling pipe seat in the tubing collar; S47. Use hydraulic pliers to buckle; S48. The workover rig lowers the casing milling pipe seat on the drilling platform; S49. The C-type chuck clamps the extension rod seat on the tubing collar; S410. Lower the steel wire rope so that the lower steel wire rope connector is seated on the C-type chuck; S411. Remove the upper steel wire rope connector and the lower steel wire rope connector. Preferably, in step S4, a sawtooth sandblasting head is connected to the bottom of the milling tube.
[0021] Preferably, in step S4, the bottom of the casing milled pipe is made of unhooked oil pipe.
[0022] Preferably, in step S4, the coiled tubing is unblocked by means of casing backwashing.
[0023] Preferably, after the completion of S6 circulating well washing and sand flushing, S7: pulling out the coiled tubing after unblocking and S8: pulling out the sand flushing tubing are performed. If there is a large diameter tool at the bottom of the coiled tubing, S8: pulling out the sand flushing tubing can be performed first, and then S7: pulling out the coiled tubing after unblocking.
[0024] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation modes, which are merely illustrative rather than restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, all of which are within the protection of the present invention.
Claims
1. A coiled tubing core milling and salvaging device, characterized in that: The invention comprises a steel wire rope (1), a blowout prevention box (2), a faucet (3), a milling tube (5), an upper steel wire rope connector (6), a lower steel wire rope connector (7), a C-type chuck (8), an oil pipe coupling (9), a hanging card (10), an extension rod and a connector (12), wherein the steel wire rope (1) passes through the milling tube (5) and is connected to the upper steel wire rope connector (6), the blowout prevention box (2) is installed at the top of the milling tube (5), the faucet (3) is installed at the upper part of the milling tube (5), and the upper steel wire rope is connected to the lower steel wire rope connector (6). The lower part of the rope connector (6) is connected to the lower wire rope connector (7), the lower wire rope connector (7) is seated on the C-type chuck (8), the C-type chuck (8) clamps the extension rod on the oil pipe coupling (9), the oil pipe coupling (9) is seated on the elevator (10), the elevator (10) is seated on the drilling platform plane (11), the continuous oil pipe (13) located below the drilling platform plane (11) is connected to the extension rod through the connector (12), and the sleeve milling pipe (5) is connected to the extension rod in the oil pipe coupling (9).
2. The coiled tubing core milling and fishing device according to claim 1 is characterized in that: The faucet (3) is connected to the water inlet and outlet pipes (4), and the water inlet and outlet pipes (4) are in communication with the sleeve milling pipe (5).
3. The coiled tubing core milling and fishing device according to claim 1 is characterized in that: The upper wire rope connector (6) comprises an upper cylinder (19), a slip (20) and a lower joint (22); the lower end of the wire rope (1) is inserted into the upper cylinder (19) and clamped by the slip (20); and the lower wire rope connector (7) is connected to the lower joint (22).
4. The coiled tubing core milling and fishing device according to claim 3 is characterized in that: An adjusting washer (21) is provided on the outer side of the slip (20), and the tightness of the slip (20) can be adjusted by adjusting the washer (21).
5. A coiled tubing core milling salvage method, using the coiled tubing core milling salvage device according to claim 1, characterized in that: The following steps are involved: S1, cutting coiled tubing at the wellhead; S2. Install the coiled tubing connector, extension rod and lower part of the wire rope connector; S3. Install wellhead blowout prevention equipment, including annular blowout preventer, double gate blowout preventer, wellhead main valve, wellhead and casing; S4, pass the steel wire rope through the milling pipe to connect it with the coiled tubing below the drilling platform plane; S5. When the casing milling pipe encounters resistance, close the annular blowout preventer; S6. After the casing milling pipe is connected to the coiled tubing below the drilling platform plane, the well is circulated and sand is flushed; S7, after unblocking, pull out the coiled tubing below the drilling platform plane; S8. Lift out the sand flushing oil pipe.
6. The coiled tubing core milling salvage method according to claim 5, characterized in that: The step S4 comprises the following steps: S41. Pass the steel wire rope through the casing milling pipe; S42. The crane and the workover rig cooperate to lift the casing milling pipe and the steel wire rope; S43. Connect the upper steel wire rope connector with the lower steel wire rope connector; S44. Lift a certain load; S45. Remove the C-type chuck; S46. The workover rig lowers the casing milling pipe seat in the tubing collar; S47. Use hydraulic pliers to buckle; S48. The workover rig lowers the casing milling pipe seat on the drilling platform; S49. The C-type chuck clamps the extension rod seat on the tubing collar; S410. Lower the steel wire rope so that the lower steel wire rope connector is seated on the C-type chuck; S411. Remove the upper steel wire rope connector and the lower steel wire rope connector.
7. The coiled tubing core milling salvage method according to claim 5, characterized in that: In step S4, a sawtooth sandblasting head is connected to the bottom of the milling pipe.
8. The coiled tubing core milling salvage method according to claim 5, characterized in that: In the step S4, the bottom of the milled pipe is sleeved with a non-coupling oil pipe.
9. The coiled tubing core milling salvage method according to claim 5, characterized in that: In step S4, the coiled tubing is unblocked by using the casing backwashing method.