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Successive-compounding-process based plugging method for well drilling

A plugging method and technology of composite method, which are applied in drilling compositions, chemical instruments and methods, earthwork drilling, etc., can solve the problem of low plugging success rate, narrow application range, and difficulty in improving the pressure bearing capacity of weak formations, etc. problems, to achieve the effect of high success rate of plugging, improving the success rate of plugging, and broadening the scope of application

Inactive Publication Date: 2012-05-02
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0008] The present invention aims at only one leakage characteristic in the prior art with a single plugging fluid, and has a narrow scope of application; and it is difficult to improve the pressure bearing capacity of weak formations under multiple sets of pressure layer systems in the same open hole section, resulting in a low plugging success rate. In order to solve the defects, a new type of drilling plugging technology is proposed, that is, the sequential compound plugging method

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  • Successive-compounding-process based plugging method for well drilling

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Embodiment

[0072] Embodiment: successive compound method plugging method of the present invention

[0073] First mix 12m3 cement slurry, the formula is: 2400g cement, natural plant fiber (0.3%), polyacrylate fluid loss reducer (3%), rubber particle high-strength proppant (3%), expansion fiber anti-cracking agent (0.2 %), cement mortar defoamer (0.2%). Add 8m3 bridge plugging slurry, the formula is: calcium carbonate powder (5%), saw foam (7%), medium particle composite plugging agent (including rice husk, walnut shell, cottonseed husk) (3%), medium particle walnut The shell (1.5%) and high carbon fiber (3%) are combined to make 20m3 of successive composite plugging slurry.

[0074] At 1:30 on the 20th, the drilling tool was lowered to 2111m without any obstruction. After the water hole was topped, the leakage plugging fluid was pumped in successively according to the ratio of 6:4, with a displacement of 50SPM, and a total of 17m3 was pumped; m3, 3.5m3 is left inside the drill pipe.

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Abstract

The invention discloses a successive-compounding-process based plugging method for well drilling. In the plugging method, a well-cementing cement pump or a mud pump is used for pumping two or more than two kinds of plugging fluids with different components and properties into an underground leakage zone successively in proportion. By means of the plugging method, the applicable range of the plugging fluids can be broadened, the loading capacity of a barefoot interval stratum can also be greatly increased, and the problem of low plugging success rate can be solved. According to the plugging method, a retention layer can be formed in porous media; the purpose of increasing the loading capacity and compressive strength of the stratum can be achieved by compounding the plugging fluids with different components and different properties; in addition, the construction process is simple, the plugging success rate is high, and the well drilling cost is effectively reduced.

Description

technical field [0001] The present invention relates to the fields of drilling and cementing in petroleum exploration and development; in particular, it relates to a method of sending two or more than two kinds of plugging fluids with different components and different properties into downhole leaking layers in proportion and successively. . Background technique [0002] In the field of petroleum exploration and development, it is a commonly used method to send the plugging liquid into the downhole leakage layer through the cement pump or mud pump. [0003] Document 1 "Discussion on the technical measures of plugging in coalbed methane drilling in the Hancheng block" proposes corresponding plugging measures: add single seals, sawdust and composite materials to sandy mudstone with permeable and developed longitudinal fractures; If the sandstone has a large leakage, it should be plugged with large particle materials and cement, and if necessary, it should be cemented with cem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/13E21B33/14C09K8/467
Inventor 薛玉志宋兆辉李涛王显光
Owner CHINA PETROLEUM & CHEM CORP
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