Well wall protective agent of gas drilling well stratum under water yielding condition

A technology of formation water production and gas drilling, which is applied in the directions of drilling composition, chemical instruments and methods, etc., can solve the problem of no on-site experiments, etc., and achieve the effect of prolonging the collapse period

Active Publication Date: 2013-06-26
DAQING PETROLEUM ADMINISTRATION +1
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Problems solved by technology

At present, there are few reports on wellbore protection technology based on gas drilling in China. Southwest Petroleum Institute has proposed some experimental methods for evaluating wellbore protection agents, and proposed the idea of ​​using water-based mud inhibitors for atomized foam drilling , but no field experiments

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  • Well wall protective agent of gas drilling well stratum under water yielding condition

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Embodiment Construction

[0008] The present invention will be further described below in conjunction with embodiment:

[0009] The protective agent preparation method used in the following experiments is as follows (mass percentage): potassium trimethylsiliconate 30%, hydrolyzed polyacrylonitrile sodium salt 5%, sodium silicate (Na 3 SiO 4 ) 8% and water 57% mixed in the system.

[0010] 1. Evaluation experiment of film-forming property of real-time film-forming protective agent for well wall:

[0011] The real-time film-forming protective agent for the borehole wall was used in the laboratory to use Denglouku Formation mud shale and medium-permeability sandstone as experimental objects to evaluate its film-forming protective effect. After the rock sample was protected by the protective agent for 30 minutes, it was soaked in water for 72 hours. The experimental results showed that the real-time film-forming protective agent on the borehole wall can penetrate into the rock sample no matter on the sur...

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Abstract

The invention discloses a well wall protective agent of a gas drilling well stratum under a water yielding condition. The protective agent comprises the following components in percentage by weight: 25-30 percent of potassium trimethylsilanolate, 5-6 percent of poly(acrylonitrile-alpha-crylamide-sodium acrylate)hydrolyzate, 5-10 percent of sodium silicate and the balance of water. The protective agent can form hydrophobic films on the surfaces of mud shales and sandstone samples and can effectively prevent water from invading; the protective agent can ensure that the surfaces of the water-containing mud shales are strengthened and has stronger anti-collapse inhibition capacity; and the protective agent has better compatibility with atomized foam drilling fluid and organic silicon drillingfluid and meets the requirement on on-site construction processes.

Description

Technical field: [0001] The invention relates to a well wall protection agent in the field of oil field drilling, in particular to a well wall protection agent under the condition of water-out formation of gas drilling formations. Background technique: [0002] During gas drilling, when drilling into water-producing formations, it often encounters poor cuttings carrying, increased torque, "mud ring" formed by cuttings accumulation, and sticking of drilling tools. In severe cases, it may even lead to well collapse and drill sticking, etc. Downhole complex accidents prevented gas drilling from reaching the designed well depth, and forced conversion to conventional drilling. [0003] Borehole protection agent can effectively improve the above situation. At present, there are few reports on wellbore protection technology based on gas drilling in China. Southwest Petroleum Institute has proposed some experimental methods for evaluating wellbore protection agents, and proposed th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/575
Inventor 张坤杨智光于兴东何恕
Owner DAQING PETROLEUM ADMINISTRATION
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