Drilling fluids that reduce formation damage and drilling fluids used in coalbed methane development drilling

A drilling fluid and formation technology, applied in the field of drilling fluid, can solve the problems of high cost and unsatisfactory effect, and achieve the effects of reducing damage, reducing water lock effect and reducing capillary resistance.

Active Publication Date: 2017-03-15
CHINA UNITED COALBED METHANE NAT ENGRES CENT +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The invention provides a drilling fluid for reducing formation damage, so as to solve the problems of high cost or unsatisfactory effect in the prior art for solving the water locking effect

Method used

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  • Drilling fluids that reduce formation damage and drilling fluids used in coalbed methane development drilling

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The formula is: fresh water 800g, acrylic acid, acrylamide and 2-acrylamide-2-methylpropanesulfonic acid terpolymer (hereinafter referred to as HYJ-1) 8g, polyanionic cellulose (hereinafter referred to as PAC-LV) 4g, Emulsified asphalt 8g, polyethylene glycol 16g, inorganic sodium bentonite 12g, fluorocarbon surfactant 8g, sodium carbonate 24g. The mass ratio of each component is water: HYJ-1: PAC-LV: emulsified asphalt: polyethylene glycol: inorganic sodium bentonite: fluorocarbon surfactant: sodium carbonate = 100: 1: 0.5: 1: 2: 1.5 :1:3.

Embodiment 2

[0047] The formula is: fresh water 800g, HYJ-18g, PAC-LV16g, emulsified asphalt 8g, polyethylene glycol 16g, inorganic sodium bentonite 12g, fluorocarbon surfactant 8g, sodium carbonate 24g. The mass ratio of each component is water: HYJ-1: PAC-LV: emulsified asphalt: polyethylene glycol: inorganic sodium bentonite: fluorocarbon surfactant: sodium carbonate = 100: 1: 2: 1: 2: 1.5 :1:3.

Embodiment 3

[0049] The formula is: fresh water 800g, HYJ-120g, PAC-LV4g, emulsified asphalt 8g, polyethylene glycol 16g, inorganic sodium bentonite 12g, fluorocarbon surfactant 8g, sodium carbonate 24g. The mass ratio of each component is water: HYJ-1: PAC-LV: emulsified asphalt: polyethylene glycol: inorganic sodium bentonite: fluorocarbon surfactant: sodium carbonate = 100: 2.5: 0.5: 1: 2: 1.5 :1:3

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PUM

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Abstract

The invention discloses a drilling fluid for reducing formation damage, and a drilling fluid used in coal-bed gas development drilling. The drilling fluid for reducing formation damage comprises, by mass, 100 parts of freshwater, 1.5-4.5 parts of a fluid loss additive, 1 part of an anti-sloughing agent, 2 parts of polymeric alcohol, 1.5 parts of inorganic sodium bentonite, 1 part of a fluorocarbon surfactant and 3 parts of an inorganic base. The drilling fluid can effectively reduce the surface tension of a reservoir liquid in order to generate wetting or dewetting, and can also reduce the capillary resistance of the reservoir in order to greatly reduce the water block effect generated in the drilling process. The drilling fluid is especially suitable for being used in the coal-bed gas development drilling.

Description

technical field [0001] The invention relates to the field of drilling in the development of coalbed methane, in particular to a drilling fluid for reducing bottom damage and the drilling fluid used in the development of coalbed methane. Background technique [0002] Drilling fluid is the circulating flushing medium used in the hole during the drilling process. Drilling fluid is the blood of drilling, also known as drilling flushing fluid. Drilling fluid can be divided into clear water, mud, clay-free flushing fluid, emulsion, foam and compressed air according to its composition. Clear water is the earliest drilling fluid, it does not need to be treated, it is easy to use, and it is suitable for areas with complete rock formations and sufficient water sources. Mud is a widely used drilling fluid. It is mainly suitable for unstable rock formations with loose walls, developed cracks, easy to collapse and drop blocks, and swelled and spalled when exposed to water. [0003] Th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/22
CPCC09K8/22
Inventor 毛志新张太亮全红平彭宏钊陈东邓钧耀纪元张毅田天
Owner CHINA UNITED COALBED METHANE NAT ENGRES CENT
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