A gel slug isolation well control method

A gel and wellbore technology, applied in sealing/isolation, earthwork drilling, wellbore/well components, etc., to achieve novel technical ideas, reliable technical solutions, and improve the success rate

Inactive Publication Date: 2016-01-06
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art, provide a gel slug isolation well control method, provide safe operation time for drilling stoppage and plugging (such as deploying mud plugging, tripping drill string, etc.), improve overflow Kill the success rate, reduce the safety risk of well control, and solve the problems of conventional well control technology in the complex wellbore situation where the fractured reservoir overflows and leaks coexist

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  • A gel slug isolation well control method

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Embodiment

[0029] A gel slug isolation well control method, it comprises the following steps:

[0030] S1. When drilling in a complex wellbore situation where spills and leaks coexist (such as fractured reservoirs, that is, reservoirs 8 with fractures 9, leakage, and gas overflow 10), first implement throttling and exhaust, and plugging while drilling; If the pressure bearing capacity meets the requirements of the heavier drilling fluid, use the heavier drilling fluid to throttle and kill the well, restore and rebuild the wellbore pressure balance relationship, see figure 1 ;

[0031] S2. If plugging while drilling is unsuccessful, resulting in dirty wellbore exhaust and pressure bearing capacity not meeting the requirements of heavier drilling fluid, use throttling circulation to inject gel until a gel slug 11 is formed in the lower part of the wellbore. Isolate the wellbore, block the upward movement (upward channeling) of oil and gas, and effectively control the complex leakage at th...

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Abstract

The invention discloses a gel plug packing well control method. The well control method includes the following steps that S1, a gel plug is built in a wellbore when spillage together with complicated wellbore conditions appear; S2, throttling circulating exhaust is performed on packed upper portion of the wellbore; S3, preparatory work for boring stopping and leaking stoppage is performed in safe operation time provided by wellbore packing; S4, the gel plug is broken to remove the wellbore packing, and leaking stoppage operation is performed by the adoption of an extrusion method; S5, weighted drilling fluid is used for throttling well killing. The well control method has the advantages that due to wellbore packing through the gel plug and removal of wellbore packing through gel breaking, a brand new choice is provided for processing the complicated wellbore conditions; the gel plug blocks an oil-gas shifting-up channel, in this way, overflow is effectively controlled to be located in the bottom hole, the safe operation time is provided for leaking stoppage and well killing, and safety risks of well control are reduced; the technical thought is novel, the technical scheme is reliable, and the well control method is beneficial for forming a practical engineering technology.

Description

technical field [0001] The invention relates to the technical field of oil and gas well pressure control (well control), in particular to a gel slug isolation well control method suitable for the complex situation of fractured reservoir overflow and coexistence of wellbore. Background technique [0002] For fractured reservoirs, the existence of holes and fractures makes a good channel between the wellbore and the reservoir. Compared with the traditional well control technology for permeable reservoirs, the fractured reservoir well control There are considerable differences in well control theory, established technical system and other aspects. [0003] Because the fractured reservoir does not meet the seepage conditions, the seepage resistance is very small, resulting in a narrow safe density window: under negative pressure conditions, it is a typical negative pressure continuous overflow (only overflow but not leakage); under positive pressure conditions, it is typical Le...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B33/10E21B33/12
Inventor 刘绘新雷鸣何博逾王健功袁征赖汶龙
Owner SOUTHWEST PETROLEUM UNIV
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