A kind of clean drilling fluid for multi-branch horizontal well reservoir of coalbed methane and its preparation method
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A multi-lateral, horizontal well technology, applied in the field of drilling fluids, can solve problems such as borehole instability, poor lithology, and large damage to coalbed methane reservoirs, achieving less scour, less reservoir damage, and no residual glue Effect
Active Publication Date: 2016-06-29
BC P INC CHINA NAT PETROLEUM CORP +1
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In recent years, my country's coalbed methane test wells mostly use multi-branch horizontal wells with open-hole completion, and the use of conventional oil and gas well drilling fluids has caused great damage to coalbed methane reservoirs, and often the gas production after drilling and completion is almost zero; because my country's coalbed methane development mainly Concentrate on high-rank coal. Compared with lower-rank coal, its strength is poor and it is easy to collapse. Using clean water as drilling fluid has poor lithology and serious erosion of the well wall. During drilling, the well wall is prone to instability and the rock Chips cannot be carried out in time, resulting in frequent drill stuck accidents
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[0023] The above-mentioned preparation method for the clean drilling fluid of the multi-branched horizontal well reservoir of coalbed methane is characterized in that, in parts by weight, it comprises the following steps:
[0024] (1) Take 100 parts of clean water, pour it into the slurry cup of the high-speed mixer, and adjust the stirring speed to (3-5)*10 3 r / min, while stirring, add 0.5-1 parts of gelling agent;
[0025] (2) Add 0.5-1 part of glue aid to the solution obtained in (1) while stirring;
[0026] (3) Add 0.1 to 0.2 parts of high-temperature stabilizer to the solution described in (2) while stirring. After the addition, adjust the stirring speed to (10-12)*10 3 r / min, continue to stir for 10-30min, then it can be used.
[0027] Below in conjunction with specific embodiment the present invention is described in further detail:
Embodiment 1
[0029] (1) Take 400mL of clear water, pour it into the slurry cup of the high-speed mixer, and adjust the stirring speed to 4*10 3 r / min, while stirring, add 2g gelling agent (mixed by 1.6g cetyltrimethylammonium bromide and 0.4g cetylpyridinium chloride);
[0030] (2) Add 2 g of colloidal aid (composed of 1 g of sodium salicylate and 1 g of potassium chloride) to the solution obtained in (1) while stirring;
[0031] (3) Add 0.4g high-temperature stabilizer (sodium thiosulfate) to the solution described in (2) while stirring. After the addition is complete, adjust the stirring speed to 11*10 3 r / min, and continue to stir for 20min to obtain the special clean drilling fluid for the coalbed methane multi-branch horizontal well reservoir of the present invention.
[0032] The rheological parameters of the clean drilling fluid for coalbed methane multi-branch horizontal well prepared by the above method after aging at room temperature and high temperature were measured below.
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Abstract
The invention discloses clean drilling fluid used for a coal bed gas multi-branch horizontal well storage layer and a preparation method of the clean drilling fluid. The drilling fluid consists of the following materials in parts by weight: 100 parts of clear water, 0.5-1 part of a gelatinizing agent, 0.5-1 part of gelatinizing aid, and 0.1-0.2 part of a high temperature stabilizer, wherein the gelatinizing agent is composed of hexadecyl trimethyl ammonium bromide and cetyl pyridinium chloride monohydrate in a weight ratio of 4:1; the gelatinizing aid is composed of sodium salicylate and potassium chloride in a weight ratio of 1:1; the high temperature stabilizer is sodium thiosulfate. The drilling liquid does not use bentonite or polymer to improve viscosity, but uses micromolecule surfactant to form a micelle for increasing viscosity, is good in rock carrying capacity, quick and complete to break glue, and capable of guaranteeing a well hole to be clean while protecting the coal bed gas storage layer to the greatest extent, and reducing scouring of drilling fluid on well wall, so that drill blocking risks are lowered, and therefore, contradiction between the drilling safety and the storage layer protection in a drilling process of the existing coal bed gas multi-branch horizontal well is relieved to a certain extent.
Description
technical field [0001] The invention relates to a drilling fluid, in particular to a clean drilling fluid for multi-branched horizontal well reservoirs of coalbed methane and a preparation method thereof. Background technique [0002] As an unconventional gas resource, coalbed methane has been paid more and more attention. my country has abundant reserves of coalbed methane, so it is imperative to study the technology of coalbed methane exploration and development in depth. [0003] In the 1970s, research work on coalbed methane development began abroad, and a set of mature theories and mining techniques have been formed. However, the United States and other countries that are strong in coalbed methane exploration and development are mostly working on low-rank coalbed methane. Clear water is generally used as the drilling fluid for multi-branch horizontal wells completed. [0004] my country began to carry out research on coalbed methane in the 1990s. After 2005, the develo...
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