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A drilling fluid for protecting coalbed methane reservoirs

A drilling fluid and coalbed methane technology, applied in the direction of drilling compositions, instruments, analysis materials, etc., can solve the problems of failure to effectively protect coalbed methane reservoir coal seam wall stability, coalbed methane reservoir damage, and reduce storage capacity. problems such as layer permeability, to achieve the effect of strengthening promotion and application value, preventing hydration, and maintaining stability

Inactive Publication Date: 2016-08-03
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a drilling fluid for protecting coalbed methane reservoirs, aiming at solving the serious damage of the current drilling fluid to the coalbed methane reservoirs during the drilling process of the coalbed methane reservoirs, reducing the permeability of the reservoirs, Insufficient desorption of coalbed methane, failure to effectively protect the coalbed methane reservoir and maintain the stability of the coalbed well wall

Method used

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  • A drilling fluid for protecting coalbed methane reservoirs
  • A drilling fluid for protecting coalbed methane reservoirs

Examples

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specific Embodiment approach

[0060] Specific embodiments: The experimental methods adopted in the following specific examples are conventional methods unless otherwise specified.

[0061] The materials and reagents used in the following specific examples can be obtained from commercial sources unless otherwise specified.

[0062] Sodium hydroxide and potassium hydroxide in the pH regulator in the following specific examples of the present invention were purchased from Jinan Century Lianxing Economic and Trade Co., Ltd., and sodium carbonate and sodium bicarbonate were purchased from Jinan CITIC Chemical Co., Ltd.

[0063] Sodium chloride, potassium chloride, calcium chloride, and magnesium chloride in the water-sensitivity inhibitors in the following specific examples of the present invention were all purchased from Jinan Xintongchuang Chemical Co., Ltd.

[0064] The polyoxyethylene alkylphenol ether in the waterproof locking agent in the following specific examples of the present invention was purchased ...

example 1

[0066] Example 1: Preparation of Drilling Fluid for Protecting Coalbed Methane Reservoirs

[0067] Formula 1: 400mL fresh water, 0.60g sodium carbonate, 0.40g sodium hydroxide, 12.00 water sensitivity inhibitor (sodium chloride), 1.20g waterproof lock agent (polyoxyethylene alkylphenol ether, polyoxyethylene octylphenol ether The mass ratio of polyether diamine and polyether diamine in the preparation is 3:5:2).

[0068] According to the composition of formula 1, under low-speed (600rpm) stirring conditions, add sodium carbonate, sodium hydroxide, water-sensitivity inhibitor, and waterproof lock agent to fresh water in sequence to obtain the drilling fluid for protecting the coalbed methane reservoir, which is recorded as 1 #drilling fluid.

example 2

[0069] Example 2: Preparation of Drilling Fluid for Protecting Coalbed Methane Reservoirs

[0070] Formula 2: 400mL of fresh water, 0.60g of sodium carbonate, 0.40g of sodium hydroxide, 14.00g of water-sensitive inhibitor (the mass ratio of sodium chloride to calcium chloride is 6:1), 1.20g of waterproof locking agent (polyoxyethylene alkanes The mass ratio of base phenol ether, polyoxyethylene octyl phenol ether and polyether diamine during preparation is 2:5:3).

[0071] According to the composition of formula 2, under low-speed (600rpm) stirring conditions, add sodium carbonate, sodium hydroxide, water-sensitivity inhibitor, waterproof locking agent to the fresh water in turn, and obtain the drilling fluid for protecting the coalbed methane reservoir, denoted as 2 #drilling fluid.

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Abstract

The invention discloses a drilling fluid capable of protecting a coal bed methane reservoir. The drilling fluid comprises the following ingredients in percentage by weight: 100 parts of fresh water, 0.1-0.3 part of pH value modifier, 0.5-10 parts of water-sensitivity inhibitor, and 0.1-1 part of waterproof blocking agent. For the drilling fluid, the density is 1.01-1.08g / cm<3>, the pH value ranges 8 to 10, the expansion rate reduction ratio is greater than or equal to 60%, the contact angle reduction rate is greater than or equal to 50%, the hygroscopic-state recovery rate of the core permeability is greater than or equal to 85%, the dry-state recovery rate is greater than or equal to 95%, the coal powder landberra volume reduction rate is greater than or equal to 15%, clay-free phase does not exist, the damage to the coal bed methane reservoir caused by same-phase invasion can be furthest reduced, the hydration of the clay mineral in coal petrography can be effectively prevented, water blocking is reduced, the coal bed methane can be forced to be desorbed from the surface of the coal petrography, the coal bed methane reservoir can be effectively protected, the stability of the coal bed well wall can be retained, the practicability is strong, and the stronger popularization and application values can be achieved.

Description

technical field [0001] The invention belongs to the technical field of oil and natural gas drilling fluids, in particular to a drilling fluid for protecting coalbed gas reservoirs. Background technique [0002] Coalbed methane is a kind of unconventional natural gas resource that is self-generated and self-storage in the coal seam itself, and its main component is methane. my country's coalbed methane resources are about 36.81 trillion m 3 , is three times that of the United States, and is equivalent to the amount of conventional onshore natural gas resources. In recent years, efforts have been made to explore and develop coalbed methane, but the industrial scale and commercial value have not yet formed, and many technical difficulties have been encountered. Reservoir protection Questions are one of them. Coalbed methane reservoirs are very different from conventional sandstone and carbonate reservoirs. They have high adsorption, low permeability, and are easy to be compre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/12G01N7/04
Inventor 钟汉毅邱正松马永乐黄维安江琳曹杰白雪飞
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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