Clean poly-film drilling fluid used for coal bed methane and preparation method thereof

A technology of drilling fluid and coalbed methane, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as pollution, gel-breaking coal seam, coal seam collapse and block, etc., to achieve fast gel-breaking, excellent performance, and small damage Effect

Active Publication Date: 2017-03-01
CNPC BOHAI DRILLING ENG +2
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  • Claims
  • Application Information

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Problems solved by technology

[0003] In view of this, the present invention aims to propose a polymembrane drilling fluid for cleaning coalbed methane and its preparation method to solve the problems of coal seam collapse, broken glue and coal seam pollution.

Method used

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  • Clean poly-film drilling fluid used for coal bed methane and preparation method thereof

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Embodiment 1

[0022] 1) Measure 360mL of clear water and place it in the slurry cup of the mixer, adjust the stirring speed of the mixer to 73r / min, and add 20g of film-forming agent, 8g of film-fixing agent, 8g of degradable film-strengthening agent, 8g of degradable Emulsion fluid loss reducer, stir for 10 minutes;

[0023] 2) Under the condition of a stirring speed of 73r / min, add 4g of coal seam cleaner with a shear pump and stir for 30min;

[0024] 3) Under the condition of a stirring speed of 73r / min, add 40g of inert inorganic salt with a shear pump, and stir for 1 hour to obtain the poly-film drilling fluid for cleaning coalbed methane according to the present invention.

[0025] The rheological parameters of the polymembrane drilling fluids used for coalbed methane cleaning prepared according to the above method after aging at room temperature and high temperature are respectively measured below.

[0026] High temperature aging method: Put the drilling fluid prepared by the above ...

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Abstract

The invention provides a clean poly-film drilling fluid used for coal bed methane and a preparation method thereof. The clean poly-film drilling fluid includes, by weight, 80-100 parts of clear water, 3-5 parts of a film forming agent, 1-3 parts of a film fixing agent, 1-3 parts of a degradable film reinforcing agent, 0.5-1.5 parts of a coal bed cleanser, and 1-3 parts of a degradable emulsion filtration loss reducer. The clean poly-film drilling fluid is used for coal bed methane and has unique rheological property and filtration loss wall building property, and can control filtrate from entering the coal bed and has strong capability of inhibiting collapse and block falling in the coal bed. Technical advantage of combination of various treatment agents for preventing collapse is fully achieved, so that the drilling fluid has excellent performances, is easy to maintain and process, is quick in gel breaking and has no residue, and has low damage on coal bed methane reservoir.

Description

technical field [0001] The invention belongs to the technical field of coalbed methane exploitation, and in particular relates to a poly-film drilling fluid used for cleaning coalbed methane and a preparation method thereof. Background technique [0002] China's coalbed methane resources are 30-35 trillion m3, and the total resources of coalbed methane within the range of 300-1500m are about 25 trillion cubic meters. Since the 1980s and 1990s, after decades of research and exploration, my country has made great progress in coalbed methane geological theory, resource prediction and block evaluation, drilling and completion, and fracturing technology. Coal bed methane enrichment theory and coal bed methane multi-branch horizontal wells, U-shaped wells and other complex structure well drilling techniques have achieved good results in coal bed methane resources. However, it is undeniable that my country's coalbed methane production is still low, there are still many problems to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/12
CPCC09K8/12
Inventor 蒋官澄张永青王照辉滑志超罗鹏峰胡景东程琳许朋琛吴宏宾熊亚萍冀鹏飞刘建广商鹏辉桑军元张文斌贺垠博刘凡葛庆颖陈必武李宗源刘斌冯海平杨静王义虎贾志伟
Owner CNPC BOHAI DRILLING ENG
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