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Gas well surface layer well completion liquid-solid separation construction process

A technology of solid-liquid separation and construction technology, which is applied in the direction of wellbore/well components, earthwork drilling and production, etc. It can solve the problem that the surface completion fluid cannot be discharged, and achieve the effect of solving the problem of non-discharge

Inactive Publication Date: 2016-03-30
中国石油集团川庆钻探工程有限公司长庆钻井总公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thus solving the problem that surface completion fluid cannot be discharged

Method used

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  • Gas well surface layer well completion liquid-solid separation construction process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A gas well surface layer completion fluid solid-liquid separation construction process is carried out according to the following steps:

[0023] Step 1, the underflow pipeline 4 of the centrifuge 2 on the circulation tank 1 is connected with the clear water storage tank 6 through the transition groove 5 provided on the surface of the circulation tank;

[0024] Step 2, use the electric funnel 3 to add G320 whose mass percentage is 0.25-0.4% of the completion fluid in the circulation tank 1 to the circulation tank 1 equipped with the surface completion fluid, and stir for 10-15 minutes, and the circulation tank 1 Flocculation occurs in the internal completion fluid, and clear water precipitates out;

[0025] Step 3, turn on the centrifuge 2, adjust the speed to 1600-2000r / min, the liquid in the circulation tank 1 enters the centrifuge 2 for solid-liquid separation, and the separated solid particles are discharged through the sand outlet of the centrifuge 2, separated The...

Embodiment 2

[0029] Take the gas well surface completion fluid of Su 36-J22 well, the gas well surface completion fluid ρ=1.12g / cm 3 , FV=55S, the gas well surface completion fluid obtained is injected into the circulation tank and the mixer and centrifuge on the tank surface for solid-liquid separation treatment. The gas well surface completion fluid injected into the circulation tank is 30m 3 , using an electric funnel, add 100kgG320 (0.3% by mass) to the circulation tank containing the surface completion fluid. After stirring for 12 minutes, the completion fluid in the circulation tank is obviously flocculated and clear water is precipitated; turn on the centrifuge and adjust the speed to 1900r / min, for solid-liquid separation, the sand outlet of the centrifuge is relatively dry solid particles, the bottom flow is clear water, ρ=1.01g / cm 3 , FV=27S; the bottom flow clean water is introduced into the clean water storage tank through the transition tank to complete the solid-liquid separa...

Embodiment 3

[0031] A gas well surface layer completion fluid solid-liquid separation construction process is carried out according to the following steps:

[0032] Step 1, the underflow pipeline 4 of the centrifuge 2 on the circulation tank 1 is connected with the clear water storage tank 6 through the transition groove 5 provided on the surface of the circulation tank;

[0033] Step 2, using the electric funnel 3, add G320 whose mass percentage is 0.4% of the completion fluid in the circulation tank 1 to the circulation tank 1 containing the surface layer completion fluid, stir for 10-15 minutes, and complete the well completion fluid in the circulation tank 1. The well fluid flocculates and the clear water precipitates out;

[0034] Step 3, turn on the centrifuge 2, adjust the speed to 1800r / min, the liquid in the circulation tank 1 enters the centrifuge 2 for solid-liquid separation, the separated solid particles are discharged through the sand outlet of the centrifuge 2, and the separ...

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Abstract

The invention discloses a gas well surface layer well completion liquid-solid separation construction process, which comprises steps: a circulation tank is isolated, bottom flow of a centrifugal machine is guided into a tank surface transition slot by remoulding a bottom flow pipeline of the centrifugal machine which is arranged on the circulation tank, G320 which is 0.25-0.4% in mass percent is added into the circulation tank which is filled with well completion liquid on a surface layer, the well completion liquid in the circulation tank is obviously flocculated to separate out clean water after being stirred for 10-15 minutes, the centrifugal machine is opened to adjust the rotating speed to be 1600-2000r / min, and separates solid and liquid, a sand outlet of the centrifugal machine is extremely dry solid particles, the bottom flow is clean water, rho (Rho)=1.0-1.02g / cm3, FV=27-28S, and the clean water of the bottom flow is guided into a clean water storage tank through a transition slot to separate solid and liquid of gas well surface layer well completion liquid. A solid phase in the well completion liquid is peeled from a drilling fluid system, and is subsequently processed through curing and transferring measures and the like. The rest of the liquid phase is of a clean water state, is smaller than 1.02g / cm3 in density, is smaller than 28S in funnel viscosity, thereby solving the problems that the surface layer well completion liquid can not be discharged and pollutes surrounding environment.

Description

technical field [0001] The invention relates to the technical field of drilling fluid in the process of oil and natural gas exploration and development, in particular to a solid-liquid separation construction process for completion fluid in the surface layer of a gas well. Background technique [0002] Gas well surface completion fluid is a pollutant produced during oil drilling. It is a complex multiphase system containing mineral oil, phenolic compounds and heavy metals, and its leachate has high toxicity. Oilfield drilling produces a large amount of gas well surface completion fluid every day. Direct discharge of gas well surface completion fluid will affect the nutritional environment and quality of crop growth. Long-term accumulation will cause serious damage to surface vegetation and pollute soil and water sources. endanger human existence. At present, the harmless treatment methods of gas well surface completion fluids commonly used at home and abroad mainly include...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B41/00
Inventor 胡祖彪朱明明卢逍王清臣周波陈华吴付频王伟良南红军
Owner 中国石油集团川庆钻探工程有限公司长庆钻井总公司