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Method for preparing high-performance filming water-base drilling fluid

A water-based drilling fluid, high-performance technology, used in drilling compositions, chemical instruments and methods, etc.

Inactive Publication Date: 2008-06-18
张金波 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are many limitations in inhibiting shale hydration and drilling fluid lubricity.

Method used

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  • Method for preparing high-performance filming water-base drilling fluid

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Embodiment Construction

[0019] The present invention will be further described below in conjunction with specific embodiment:

[0020] The preparation method of the high-performance film-forming water-based drilling fluid is as follows: by weight, it contains 10 parts of NaCl, 3 parts of PAC, 0.5 parts of XC, 1 part of KPAM, 8 parts of amino-based shale inhibitors, 4 parts of lubricants, and 8 parts of ingredients. Mix film agent, 1 part NaOH, and 90 parts water, and stir evenly to make high-performance film-forming water-based drilling fluid.

[0021] KCl / polymer drilling fluid formula is:

[0022] 10% NaCl aqueous solution + 3% PAC + 0.5% XC + 1% KPAM + 8% KCl + 4% lubricant + NaOH (adjust the pH value to 10.0);

[0023] The formula of oil-based drilling fluid is:

[0024] 80% 5# white oil + 20% CaCl 2 Aqueous solution + 5% primary emulsifier + 5% secondary emulsifier + 1% wetting agent + 2.5% fluid loss control agent + 2.5% organic soil + 1.25% alkalinity regulator

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Abstract

The present invention relates to a preparation method of a high-performance film-forming water-based drilling fluid system, which is characterized in that brine is used for confecting THE typical prescription of the high-performance film-forming water-based drilling fluid system, which is 10 percent of saturant NaCl solution, 1 percent to 3 percent of fluid loss additive, 0.3 percent to 0.5 percent of polymer viscosity increaser, 0.5 percent to 1 percent of coating agent, 2.5 percent to 5 percent of amine shale inhibitor, 3 percent to 4 percent of lubricant and 7 percent to 8 percent of film-forming agent. The drilling fluid system has the good performances of good film-forming character and strong inhibiting capability and is a novel drilling fluid system which can satisfy the requirement of the environmental protection and can replace oil-based drilling fluid (OBM).

Description

technical field [0001] The invention is a novel high-performance film-forming water-based drilling fluid system. It is a new type of drilling fluid system that can meet the needs of environmental protection and can replace oil-based drilling fluid (OBM). The system has the following main excellent properties: ①Good film-forming property; ②Strong inhibition; ③Environmental friendliness; ④Good lubrication performance; Background technique [0002] Shale formations account for about 75% of the formations drilled, and more than 90% of wellbore instability occurs in shale formations. When the hydration and dispersion of mud shale and soft mudstone are not effectively inhibited, it will lead to a variety of downhole complex situations. These complex situations include: bit bagging, shrinkage, well collapse, and difficult control of rheology and fluid loss, etc. The surface hydration and permeable hydration of clay minerals in shale formations, accompanied by the transmission of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/12
Inventor 张金波赵海燕
Owner 张金波
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