Fishing method for coiled tubing of horizontal well

A horizontal well and tubing technology, applied in the field of horizontal well coiled tubing salvage, can solve the problems of low salvage efficiency and achieve the effect of improving efficiency and increasing success rate

Pending Publication Date: 2022-05-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention intends to provide a coiled tubing fishing method for horizontal wells, so as to solve the problem of low fishing efficiency in the prior art for fish falling in shale gas wells

Method used

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  • Fishing method for coiled tubing of horizontal well

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Comparison scheme
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Embodiment

[0029] The embodiment is basically as attached figure 1 As shown, the coiled tubing fishing method for horizontal wells requires the use of fishing tool strings. The 8 strings of fishing tools include connectors 2, motor head assemblies 3, accelerators 4, jars 5, throwing hands 6, The hydraulic motor 7 and the fishing tool 8, wherein the end of the connector 2 away from the motor assembly is fixedly connected with the oil pipe 1, and the hydraulic motor 7 is used to drive the fishing tool 8 to rotate; the specific fishing method includes the following steps:

[0030] Step 1. Select the fishing tool: According to the situation of the fish, choose the appropriate fishing tool. If the fish is an oil drill plug tool or a pumping bridge plug tool, use a canister to fish out, and if the fish is a cable, use a fishing hook to fish out. If the fallen fish is a large-diameter belt, use a spear to carry out internal fishing.

[0031] Step 2. Lightly detect the top of the fish: lower th...

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Abstract

The invention relates to the technical field of oil and gas exploitation, and particularly discloses a horizontal well coiled tubing salvage method which comprises the following steps: S1, lightly finding a fish top: descending a salvage tool into a well until the salvage tool touches a fish, then lifting an oil tube by 2-3 m, and recording a normal hanging weight; s2, pressurizing and fishing: lowering an oil pipe to pressurize the top of the fish for 20-50kN, if the hanging weight is increased at the moment, indicating that the fish enters, then lifting the oil pipe, and if the hanging weight is higher than the normal hanging weight at the moment, indicating that the fish is fished; if the hanging weight is not changed, continuously pressurizing the falling fish by 20-50kN, and judging the fish entering condition again; the pump is stopped after 10-20 seconds after the pump is started, if the hanging weight or the pump pressure is increased, it is indicated that the fish enters the oil pipe, then the oil pipe is lifted, and if the hanging weight is increased compared with the normal hanging weight, it is proved that the fallen fish is possibly fished. The scheme is used for solving the problem that in the prior art, the fishing efficiency of shale gas well fallen fish fishing is low.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploitation, in particular to a horizontal well coiled tubing fishing method. Background technique [0002] In shale gas development, pumping-perforation combined operation and coiled tubing construction are the key processes in gas testing engineering. Pumping-perforating combined operation and coiled tubing drilling and grinding operations are restricted by factors such as complex wellbore trajectories, pumping drilling and grinding tool strings with many specifications and complex models, and injection-perforating combined operations and coiled tubing operations will occur Hole gun bridge plug pump off, bridge plug seal stuck, cable blown off, coiled tubing broken, drilling and grinding tools broken, off, stuck, core pulling and other problems. [0003] At present, the domestic shale gas wells mainly use coiled tubing to salvage the fish in the well. meters), the ground staff cannot intu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B31/12
CPCE21B31/12E21B31/125
Inventor 张正道陈奇杨长华汪鹏黄晶吴俣昊孙超吴魏颜湘庆夏绪波
Owner CHINA PETROLEUM & CHEM CORP
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