CN216588517U - Shale gas well coiled tubing unfreezes fishing system - Google Patents
Shale gas well coiled tubing unfreezes fishing system Download PDFInfo
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- CN216588517U CN216588517U CN202123173436.5U CN202123173436U CN216588517U CN 216588517 U CN216588517 U CN 216588517U CN 202123173436 U CN202123173436 U CN 202123173436U CN 216588517 U CN216588517 U CN 216588517U
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Abstract
The utility model relates to the technical field of downhole operation of oil and gas wells, in particular to a shale gas well coiled tubing unfreezing and salvaging system, which comprises a sleeve fixedly connected with a well wall, a coiled tubing sleeved in the sleeve, a punching sleeve milling unfreezing system and an oil connecting salvaging system; the punching milling and jam releasing system comprises a punching milling pipe and a milling head fixedly connected to the bottom of the punching milling pipe; the continuous oil salvaging system comprises a continuous oil pipe extension pipe and a continuous oil pipe connector, wherein the continuous oil pipe extension pipe is fixedly connected with the top of a continuous oil pipe to be salvaged through the continuous oil pipe connector; the core-through sleeve milling pipe is sleeved between the continuous oil pipe and the sleeve. The utility model can effectively solve the problems that the coiled tubing is easy to slide down after the blockage is released and the pressure between sand bridges is suddenly released.
Description
Technical Field
The utility model relates to the technical field of downhole operation of oil and gas wells, in particular to a shale gas well coiled tubing unfreezing and fishing system.
Background
Coiled tubing is commonly used for shale gas well gas lift, drilling plug, wellbore cleanup operations, and is also increasingly used in shale gas well completions. If the sand output of the gas well is large or the bottom hole return scraps are not brought out of the shaft in time, the coiled tubing and the tools connected with the lower part of the coiled tubing are easily clamped in the sleeve fixedly connected with the wall of the well, the coiled tubing is easily broken from the upper part by forcibly lifting the movable unfreezing operation, and the unfreezing difficulty and the fishing risk are increased.
When the coiled tubing cannot be unfreezed, the technology of punching and fishing the coiled tubing is an effective processing method. However, because the shale gas well is a long horizontal well, if the coiled tubing is sleeved outside the coiled tubing for salvage through the perforating pipe, the coiled tubing leans against one side of the well wall in an inclined mode, the perforating pipe is difficult to be sleeved outside the coiled tubing for continuous lowering, even if the perforating pipe is successfully lowered and unfreezed, the coiled tubing is easy to fall to the horizontal section, and the salvage difficulty is increased.
The utility model patent with the publication number of CN108533202A discloses a coiled tubing cutting and unfreezing fishing device, which is characterized in that a slip is fixed with a coiled tubing to be blocked through the matching of the slip and a slip seat, and then the blocked part of the coiled tubing to be blocked is cut off by a cutting ring through the matching of the cutting ring and a cutting ring seat, so that the purpose of taking out the blocked coiled tubing is realized.
SUMMERY OF THE UTILITY MODEL
The utility model provides a shale gas well coiled tubing unfreezing and fishing system, and aims to solve the problems that the coiled tubing is difficult to unfreeze integrally and the coiled tubing is easy to slide down after being unfrozen.
In order to solve the technical problem, the utility model provides a shale gas well coiled tubing unfreezing and fishing system which comprises a casing fixedly connected with a well wall, a coiled tubing sleeved in the casing, a punching casing milling unfreezing system and an oil connecting and fishing system, wherein the punching casing milling unfreezing system comprises a punching casing milling unfreezing system and a punching casing milling unfreezing system; the punching sleeve milling and jam releasing system comprises a punching sleeve milling pipe and a sleeve milling head fixedly connected to the bottom of the punching sleeve milling pipe; the continuous oil fishing system comprises a continuous oil pipe extension pipe and a continuous oil pipe connector, wherein the continuous oil pipe extension pipe is fixedly connected with the top of the continuous oil pipe to be fished through the continuous oil pipe connector; the core-through sleeve milling pipe is sleeved between the coiled tubing and the sleeve.
By adopting the technical scheme, the two annular passages of the punching sleeve milling pipe and the coiled tubing and the punching sleeve milling pipe and the two annular passages of the bushing milling pipe and the bushing are established through the punching sleeve milling unfreezing system and the oil connecting fishing system, the sleeve milling head ensures that the shaft bottom is detected, the formation of the two annular passages is ensured, the flushing fluid is injected into the annular passage of the punching sleeve milling pipe and the bushing, the continuous reverse circulation sand flushing function can be realized through the two annular passages, the flushing fluid can bring out the settled sand to realize the complete unfreezing of the coiled tubing, and the coiled tubing connector and the coiled tubing extension pipe are fixedly connected to the top of the coiled tubing in sequence, so that the coiled tubing can slide downwards after the unfreezing is finished, and the coiled tubing extension pipe is lifted to drive the coiled tubing to be lifted integrally to realize the complete fishing of the coiled tubing.
Compared with the prior art, the anti-circulation sand flushing is realized through the two annular channels so as to realize the unfreezing of the continuous oil pipe, if the continuous oil pipe is directly sleeved outside the continuous oil pipe through the through pipe, the through pipe cannot be smoothly lowered because the continuous oil pipe leans against the well wall of the shale gas well in an inclined mode, but the continuous oil pipe obliquely leaning against the well wall can be straightened through the continuous oil pipe connector at the upper end of the continuous oil pipe, the continuous oil pipe is lifted upwards through the continuous oil pipe connector, the through casing milling pipe is smoothly lowered to the casing milling head to reach the sand surface, the formation of the two annular channels is ensured, and the unfreezing and the fishing of the continuous oil pipe are realized. In the releasing and fishing process, complete releasing and fishing can be realized, and the phenomenon that a part of the coiled tubing which is stuck is remained at the bottom of the well in the prior art is avoided. In conclusion, the utility model has simple implementation mode and good effect, and reduces the card-learning difficulty and the fishing risk.
Furthermore, the punching sleeve milling and unfreezing system further comprises a rotary tee joint, the side part of the rotary tee joint is connected with a high-pressure water hose, the bottom of the rotary tee joint is rotatably connected with a rotary table, and the rotary table is fixedly connected with the top of the punching sleeve milling pipe. In the process of back circulation sand washing, well washing liquid is sequentially output to the ground through a high-pressure water hose communicated with a rotary tee after passing through an annular channel between the piercing sleeve milling pipe column and the sleeve and an annular channel between the continuous oil pipe and the piercing sleeve milling pipe column, and when drilling, grinding and unfreezing are needed, the rotary table drives the piercing sleeve milling pipe to rotate, the upper part of the rotary tee can be guaranteed to be fixed in the rotating process, and the high-pressure water hose is guaranteed not to displace.
Furthermore, the oil connecting fishing system further comprises a core-penetrating steel wire rope and a steel wire rope joint fixedly connected with the core-penetrating steel wire rope, the steel wire rope joint is fixedly connected with the upper end of the coiled tubing extension pipe, and the core-penetrating steel wire rope penetrates through the rotary tee joint. The lifting operation in the process of fishing the coiled tubing is better realized through the piercing wire rope, the piercing wire rope is firmer, and the piercing wire rope is only used under the upper portion to enable the operation to be more convenient.
The blowout prevention system comprises a double-ram blowout preventer and an annular blowout preventer, wherein the annular blowout preventer is arranged above the double-ram blowout preventer. The annular blowout preventer and the double-ram blowout preventer are combined and arranged on a wellhead, so that blowout accidents are prevented.
Further, the double-ram blowout preventer is also connected with a blowout pipeline. The blowout pipeline can enable oil gas in the well to be ejected out of the well in a controlled manner, and well blowout accidents are further prevented.
Further, the coiled tubing extension pipe is at least 50cm higher than the workover platform. Generally, after the coiled tubing extension pipe is connected with the coiled tubing to be salvaged, the coiled tubing extension pipe is required to be higher than the well repairing platform by 50cm, so that the through steel wire rope can be smoothly connected and smoothly lifted.
Further, a steel wire rope blowout prevention box is installed on the rotating tee joint and used for sealing the core-penetrating steel wire rope. In the reverse circulation well washing process, the steel wire rope blowout box is used for sealing the through steel wire rope, so that well control risks are effectively controlled, and the fishing system is safe and effective.
Furthermore, the upper end of the core-through steel wire rope is fixedly connected with a crane. The coiled tubing is salvaged through the crane, and labor is saved.
Further, the blowout prevention system further comprises a cement truck, and the cement truck is used for horizontally pushing the clean water well killing. Well killing processes are connected, and the horizontal pushing well killing is realized through a cement truck.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present invention.
Detailed Description
The following is further detailed by way of specific embodiments:
reference numerals in the drawings of the specification include: the device comprises a crane 1, a piercing steel wire rope 2, a steel wire rope joint 3, a continuous oil pipe extension pipe 4, a continuous oil pipe joint 5, a continuous oil pipe 6, a rotary tee joint 7, a rotary table 8, a piercing sleeve milling pipe 9, a sleeve milling head 10, a blowout preventer stack 11, a steel wire rope blowout preventer box 12, a cement truck 13, a high-pressure water hose 14, an oil pipe head 15 and a blowout pipeline 16.
The embodiment is basically as shown in the attached figure 1:
the specific implementation process is as follows:
a shale gas well coiled tubing unfreezing and salvaging system comprises a casing fixedly installed on a well wall, a through casing milling unfreezing system, an oil connecting salvaging system and a blowout preventer group 11. The punching milling and unfreezing system comprises a punching milling pipe 9, a milling head 10 and a rotary tee joint 7, wherein a steel wire rope blowout prevention box 12 is fixedly mounted at the top of the rotary tee joint 7, the bottom of the rotary tee joint 7 is rotatably connected with a rotary table 8, the rotary table 8 is fixedly connected with the top of the punching milling pipe 9, the punching milling pipe 9 generally adopts a phi 88.9mm NU oil pipe, and the phi 108mm milling head 10 is in threaded connection with the bottom of the punching milling pipe 9. One side of the rotary tee joint 7 is led out of a high-pressure hose 14, so that the continuous positive and negative sand washing function is realized.
The punching sleeve milling and unfreezing system is sleeved outside the oil connecting fishing system, and the oil connecting fishing system comprises a continuous oil pipe extension pipe 4, a continuous oil pipe connector 5, a punching steel wire rope 2, a steel wire rope connector 3 and a crane 1. The coiled tubing extension pipe 4 is fixedly connected with a coiled tubing 6 to be salvaged through a coiled tubing connector 5, and generally, after the coiled tubing extension pipe 4 is connected with the coiled tubing 6 to be salvaged, the coiled tubing extension pipe 4 is 50cm higher than a well repairing platform. The upper end of a coiled tubing extension pipe 4 is fixedly connected with a steel wire rope joint 3, the coiled tubing extension pipe 4 is connected with a core-penetrating steel wire rope 2 through the steel wire rope joint 3, after the core-penetrating steel wire rope 2 penetrates through a steel wire rope blowout prevention box 12, the uppermost end of the core-penetrating steel wire rope 2 is connected through a crane 1, and the whole body is lifted and lowered through the crane 1. The piercing milling pipe 9 is sleeved between the coiled tubing 6 and the casing, an annular channel is formed between the piercing milling pipe 9 and the casing, and an annular channel is also formed between the piercing milling pipe 9 and the coiled tubing 6.
Blowout preventer stack 11 includes a dual ram blowout preventer, an annular blowout preventer, and a cement truck 13. The double-ram blowout preventer is installed on a wellhead, the annular blowout preventer is installed on the double-ram blowout preventer, the double-ram blowout preventer is also communicated with a blowout pipeline 16, and the cement truck 13 is used for horizontally pushing clean water to kill a well.
The specific implementation steps are as follows:
1. firstly, connecting a well killing process, horizontally pushing clear water well killing from an oil pipe by using a cement truck 13, and observing that no overflow phenomenon exists.
2. And (3) dismantling the original gas production tree and a wellhead main valve, dismantling the original coiled tubing 6 pipe hanger, connecting a coiled tubing extension pipe 4 to the upper end of the coiled tubing 6 to be salvaged, installing a blowout preventer group 11 and testing pressure.
3. The piercing milling pipe 9 is slowly put down, and a sleeve milling head 10 is in threaded connection with the lower part of the piercing milling pipe 9 until the piercing milling pipe 9 cannot be smoothly put down. And (3) pulling the piercing steel wire rope 2 fixedly connected with the upper part of the coiled tubing extension pipe 4 by using a crane 1, pulling the coiled tubing 6 which is inclined against the well wall to be upright, and then continuing to put down the piercing sleeve milling pipe 9.
4. And (5) repeating the step (3) until the sleeve milling head 10 probes the sand surface, pressing down for 4t, and repeatedly probing for 3 times without changing the depth. And (5) continuously pushing the kill shaft horizontally by using the cement truck 13, and observing that no overflow phenomenon exists.
5. The top of the piercing milling pipe 9 is provided with a rotary tee joint 7 and a steel wire rope blowout box 12. Adopting reverse circulation sand washing: well-flushing liquid is injected from an injection port between the production side wing double-gate valves of the tubing head 15, sequentially passes through the annular space between the piercing milling tube 9 and the sleeve, the annular space between the continuous oil tube 6 and the piercing milling tube 9, and is output from the high-pressure water hose 14 through the rotary tee 7 and returns to the ground.
6. And (3) taking out settled sand by the well flushing fluid, releasing the coiled tubing 6 in the well, sliding downwards, enabling the suspended weight of the through steel wire rope 2 to increase suddenly, lifting the through steel wire rope 2 to move the coiled tubing 6 by using a crane 1, stopping lifting if the load continues to increase and far exceeds the self weight of the coiled tubing 6, performing reverse circulation to kill the well again, and observing that no overflow phenomenon exists.
7. And (5) repeating the steps (3), (4), (5) and (6) until the load is stable and does not rise in the process of lifting the piercing steel wire rope (2) to release the blockage, and the continuous oil pipe (6) is successfully released the blockage.
Through fixed mounting even oily salvage system on the coiled tubing who treats the salvage, cup joint the punching sleeve again and mill the unfreezing system to and install blowout preventer group at the well head, under these three's cooperation operations, realize the complete unfreezing and the salvage process to coiled tubing, effectively solved easy gliding and sand bridge pressure release's between the easy problem after the coiled tubing unfreezes, avoided salvaging the complication, controlled well control risk, salvage system safety, effective. And when the drilling and grinding are needed to release the jam, the rotary table can drive the piercing sleeve milling pipe to rotate, so that another jam releasing mode is realized.
The foregoing is merely an example of the present invention and common general knowledge of known specific structures and features of the embodiments is not described herein in any greater detail. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several changes and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present invention should be determined by the content of the claims, and the description of the embodiments and the like in the specification should be used to interpret the content of the claims.
Claims (9)
1. The utility model provides a shale gas well coiled tubing unfreezes fishing system that blocks, includes with wall of a well fixed connection's sleeve pipe and cup joints coiled tubing in the sleeve pipe, its characterized in that: the system also comprises a punching sleeve milling and unfreezing system and an oil connecting and fishing system; the punching sleeve milling and jam releasing system comprises a punching sleeve milling pipe and a sleeve milling head fixedly connected to the bottom of the punching sleeve milling pipe; the continuous oil fishing system comprises a continuous oil pipe extension pipe and a continuous oil pipe connector, wherein the continuous oil pipe extension pipe is fixedly connected with the top of the continuous oil pipe to be fished through the continuous oil pipe connector; the core-through sleeve milling pipe is sleeved between the coiled tubing and the sleeve.
2. The shale gas well coiled tubing unfreezing fishing system of claim 1, wherein: the punching sleeve milling and unfreezing system further comprises a rotary tee joint, the side part of the rotary tee joint is connected with a high-pressure water hose, the bottom of the rotary tee joint is rotatably connected with a rotary table, and the rotary table is fixedly connected with the top of the punching sleeve milling pipe.
3. The shale gas well coiled tubing unfreezing fishing system of claim 2, wherein: the oil connecting fishing system further comprises a core-penetrating steel wire rope and a steel wire rope joint fixedly connected with the core-penetrating steel wire rope, the steel wire rope joint is fixedly connected with the upper end of the coiled tubing extension pipe, and the core-penetrating steel wire rope penetrates through the rotary tee joint.
4. The shale gas well coiled tubing unfreezing fishing system of claim 3, wherein: the blowout prevention system comprises a double-ram blowout preventer and an annular blowout preventer, and the annular blowout preventer is arranged above the double-ram blowout preventer.
5. The shale gas well coiled tubing unfreezing fishing system of claim 4, wherein: the double-ram blowout preventer is also connected with a blowout pipeline.
6. The shale gas well coiled tubing unfreezing fishing system of claim 5, wherein: the coiled tubing extension pipe is at least 50cm higher than the workover platform.
7. The shale gas well coiled tubing unfreezing fishing system of claim 6, wherein: and a steel wire rope blowout prevention box is arranged on the rotating tee joint and is used for sealing the through steel wire rope.
8. The shale gas well coiled tubing unfreezing fishing system of claim 7, wherein: the upper end of the core-penetrating steel wire rope is fixedly connected with a crane.
9. The shale gas well coiled tubing unfreezing fishing system of claim 8, wherein: the blowout prevention system further comprises a cement truck, and the cement truck is used for horizontally pushing the clean water well killing.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202123173436.5U CN216588517U (en) | 2021-12-16 | 2021-12-16 | Shale gas well coiled tubing unfreezes fishing system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123173436.5U CN216588517U (en) | 2021-12-16 | 2021-12-16 | Shale gas well coiled tubing unfreezes fishing system |
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| CN216588517U true CN216588517U (en) | 2022-05-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115288625A (en) * | 2022-10-08 | 2022-11-04 | 廊坊开发区森德石油设备有限公司 | Sand washing and fishing equipment |
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2021
- 2021-12-16 CN CN202123173436.5U patent/CN216588517U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115288625A (en) * | 2022-10-08 | 2022-11-04 | 廊坊开发区森德石油设备有限公司 | Sand washing and fishing equipment |
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