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Double-membrane pressure-bearing water-based drilling fluid

A pressurized water and drilling fluid technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve problems such as leakage of the well wall, and achieve the effects of stable wellbore, good anti-pollution performance, and wide application range

Inactive Publication Date: 2017-03-08
中石化石油工程技术服务有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the above problems, a double-membrane pressurized water-based drilling fluid of the present invention provides a double-membrane pressurized water-based drilling fluid to solve the special requirements of shale gas drilling for drilling fluid, especially to solve the problems of leakage and well wall stability. Applicable to the drilling requirements of shale gas wells with double boreholes

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Examples

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Embodiment 1

[0025] In parts by weight, add 1000 parts of water, 5 parts of soda ash and 10 parts of bentonite to the mud cup, pre-hydrate for 25 hours at 500r / min, and slowly add 10 parts of low A mixture of viscosity carboxymethyl cellulose and carboxymethyl starch (preferred mass ratio, low viscosity carboxymethyl cellulose: carboxymethyl starch = 1:10), 5 parts of xanthan gum and high viscosity carboxymethyl cellulose (preferred mass ratio, xanthan gum: high viscosity carboxymethyl cellulose = 1:10), 20 parts of well wall stabilizer HQ-1, 20 parts of plugging agent ZTC-1, 2 parts of hydrolysis degree of 30 % binary copolymer of polyacrylamide and polyacrylic acid sodium potassium salt (molecular weight is preferably 2 million), 30 parts of KCl and a mixture of polymeric alcohols (preferable polymeric alcohols are ethylene glycol, polyethylene glycol, polypropylene glycol, propane Fatty alcohol polyoxyethylene ether produced by triol and ethylene oxide, and the mass ratio, KCl: polymer ...

Embodiment 2

[0046] In parts by weight, add 1000 parts of water, 6 parts of soda ash and 10 parts of bentonite to the mud cup, pre-hydrate for 26 hours at 500r / min, and add 15 parts of low A mixture of viscosity carboxymethyl cellulose and carboxymethyl starch (preferred mass ratio, low viscosity carboxymethyl cellulose: carboxymethyl starch = 1:5), 10 parts of xanthan gum and high viscosity carboxymethyl cellulose (preferred mass ratio, xanthan gum: high-viscosity carboxymethyl cellulose = 1:8), 25 parts of well wall stabilizer HQ-1, 22 parts of plugging agent HTK-1, 4 parts of hydrolysis degree of 40 % binary copolymer of polyacrylamide and polyacrylic acid sodium potassium salt (molecular weight is preferably 4 million), 35 parts of KCl and a mixture of polymeric alcohols (preferable polymeric alcohols are ethylene glycol, polyethylene glycol, polypropylene glycol, propane Fatty alcohol polyoxypropylene ether produced by triol and propylene oxide, and the mass ratio, KCl: polymer alcoho...

Embodiment 3

[0056] In parts by weight, add 1000 parts of water, 7 parts of soda ash and 15 parts of bentonite to the mud cup, pre-hydrate for 26 hours at 500r / min, and add 20 parts of low A mixture of viscosity carboxymethyl cellulose and carboxymethyl starch (preferred mass ratio, low viscosity carboxymethyl cellulose: carboxymethyl starch = 1:3), 15 parts of xanthan gum and high viscosity carboxymethyl cellulose (preferred mass ratio, xanthan gum: high-viscosity carboxymethyl cellulose = 1:5), 20 parts of well wall stabilizer HQ-1, 25 parts of plugging agent YHS-1, 5 parts of hydrolysis degree of 50 % of polyacrylamide and polyacrylic acid sodium potassium salt binary copolymer (molecular weight is preferably 5 million), 40 parts of KCl and a mixture of polymeric alcohols (preferred polymeric alcohols are ethylene glycol, polyethylene glycol, polypropylene glycol, propane Fatty alcohol polyoxypropylene ether generated by triol and propylene oxide, and the mass ratio, KCl: polymer alcoho...

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Abstract

The invention discloses a double-membrane pressure-bearing water-based drilling fluid comprising the following materials by mass: 1000 parts of water, 10-30 parts of bentonite, 5-10 parts of soda ash, 20-30 parts of a plugging agent, 30-50 parts of a film-forming agent, 2-5 parts of a coating agent, 30-50 parts of a mud shale inhibitor, 5-10 parts of a pH adjusting agent, 5-20 parts of a flow type regulator, 10-40 parts of a filtration loss reducing agent and 20-30 parts of a borehole wall stabilizer; salt and barite can be appropriately adjusted according to needs, and the double-membrane pressure-bearing water-based drilling fluid solves the special requirements of shale gas well drilling for drilling fluids, especially solves the problems of well leakage and borehole wall stability, and is suitable for well drilling requirements of a two-opening large borehole of a shale gas well.

Description

technical field [0001] The invention relates to drilling fluid technology for shale gas development, in particular to a double-membrane pressurized water-based drilling fluid. Background technique [0002] The recoverable reserves of my country's shale gas resource prediction technology reach 10.3×1012~47.0×1012m3, which has good prospects for exploration and development. Once the large-scale exploration and development is successful, it can effectively alleviate the contradiction between oil and gas supply and demand in my country. Therefore, shale gas exploration and development It has become a major national strategy of the "Twelfth Five-Year Plan". In China, the mandatory water-based drilling fluid system is mainly used to maintain the wellbore stability of shale formations. For example, the Chinese invention patent (publication number 105331338A: publication date: 2016-02-17) reports a leak-proof high Performance water-based drilling fluid and its preparation method. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/24C09K8/20C09K8/467C09K8/487
CPCC09K8/24C09K8/206C09K8/467C09K8/487
Inventor 游云武章文斌周超群刘浩斌吴雪平刘衍前危胜宏吕成冬李思熊潇
Owner 中石化石油工程技术服务有限公司
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