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High-efficiency plugging oil-base drilling fluid and preparation method thereof

A technology of oil-based drilling fluid and drilling fluid density, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as well wall collapse, improve the pressure bearing capacity of formations, be conducive to stability, and have simple processes Effect

Active Publication Date: 2013-04-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a high-efficiency plugging oil-based drilling fluid, quickly and effectively plug the cracks in broken shale formations, prevent stress collapse and pressure mutation, and solve the problem of well wall collapse in shale formations

Method used

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  • High-efficiency plugging oil-base drilling fluid and preparation method thereof
  • High-efficiency plugging oil-base drilling fluid and preparation method thereof
  • High-efficiency plugging oil-base drilling fluid and preparation method thereof

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Embodiment 1

[0042] The high-efficiency plugging oil-based drilling fluid of this embodiment consists of the following raw materials:

[0043]

[0044]

[0045] Add barite to make the drilling fluid density reach 1.45g / cm 3 .

[0046] The preparation method of the high-efficiency plugging oil-based drilling fluid of the present embodiment comprises the following steps:

[0047] 1) Take No. 5 white oil in parts by weight, and add alkylphenol ether sulfosuccinate sodium salt, castor oil polyoxyethylene ether phosphate, fatty alcohol polyoxyethylene ether and mass fraction in sequence under stirring at 12000rpm 28% CaCl 2 Solution, measure the demulsification voltage of the water-in-oil emulsion, check the emulsion stability, and meet ES>400V;

[0048] 2) Add lecithin, imidazoline, organic soil, oxidized asphalt, humic acid, calcium oxide, xanthan gum in sequence, stir and mix well, then add sulfonated phenolic resin, water-dispersed emulsified asphalt SFT-120 (commercially available) ...

Embodiment 2

[0051] The high-efficiency plugging oil-based drilling fluid of this embodiment consists of the following raw materials:

[0052]

[0053]

[0054] Add barium carbonate to make the drilling fluid density reach 1.50g / cm 3 .

[0055] The preparation method of the high-efficiency plugging oil-based drilling fluid of the present embodiment comprises the following steps:

[0056] 1) Take No. 3 white oil in parts by weight, and add castor oil polyoxyethylene ether phosphate, polyoxyethylene sorbitan fatty acid ester and CaCl with a mass fraction of 28% in sequence under stirring at 12000 rpm 2 Solution, measure the demulsification voltage of the water-in-oil emulsion, check the emulsion stability, and meet ES>400V;

[0057] 2) Add imidazoline, oxidized asphalt, modified asphalt, humic acid, calcium hydroxide, calcium oxide, xanthan gum, and phenolic resin in sequence, stir and mix well, then add lignite resin, sulfonated phenolic resin, and water-dispersed emulsified asphalt...

Embodiment 3

[0060] The high-efficiency plugging oil-based drilling fluid of this embodiment consists of the following raw materials:

[0061]

[0062]

[0063] Add barite and limestone to make the drilling fluid density reach 1.56g / cm 3 .

[0064] The preparation method of the high-efficiency plugging oil-based drilling fluid of the present embodiment comprises the following steps:

[0065] 1) Take No. 3 white oil and No. 5 white oil in parts by weight, and add alkylphenol ether sulfosuccinate sodium salt, fatty alcohol polyoxyethylene ether, and polyoxyethylene sorrel under stirring at 12000 rpm. Alcohol fatty acid ester and mass fraction are 28% CaCl 2 Solution, NaCl solution, measure the demulsification voltage of the water-in-oil emulsion, check the emulsion stability, and meet ES>400V;

[0066] 2) Add lecithin, organic soil, oxidized asphalt, calcium hydroxide, phenolic resin in turn, stir and mix well, then add lignite resin, water-dispersed emulsified asphalt SFT120 (comme...

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Abstract

The invention discloses a high-efficiency plugging oil-base drilling fluid and a preparation method thereof. The drilling fluid is prepared from the following raw materials in parts by mass: 70-80 parts of slurrying oil, 20-30 parts of slurrying water, 2.5-3.0 parts of main emulsifier, 1.5-2.0 parts of auxiliary emulsifier, 2.0-2.5 parts of wetting agent, 2.0-2.5 parts of flow pattern regulator, 2.5-3.0 parts of fluid loss agent, 1.5-2.0 parts of alkalinity regulator, 0.5-0.8 part of extracting agent and 7-9 parts of plugging material. A weighting material is added so that the density of the drilling fluid reaches 1.45-1.56 g / cm<3>. By utilizing the well-drilling positive differential pressure, the high-efficiency plugging oil-base drilling fluid quickly implements bridging, filling and filming to plug the formation fractures on the well wall surface and near the well wall, effectively prevents the drilling fluid and filtrate thereof from permeating into microfractures, enhances the bearing capacity of the formation, has favorable plugging effect, and is beneficial to the stability of the well wall.

Description

technical field [0001] The invention belongs to the technical field of petroleum engineering drilling fluid, and in particular relates to a high-efficiency plugging oil-based drilling fluid, and also relates to a preparation method of the drilling fluid. Background technique [0002] With the increasing demand for energy around the world, energy pressure is increasing day by day, and shale oil and gas are widely distributed around the world, and the exploitation of shale gas has become a hot spot in global resource development. Horizontal wells are usually used for development, but shale gas formations have the following common features: shale-based lithology, high content of clay minerals, easy to hydrate and expand, causing increased collapse pressure; formation bedding, micro-cracks and fractures are developed, if Fractures cannot be effectively sealed, and increasing the density of the drilling fluid will increase the collapse pressure instead, causing the shale to colla...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/32C09K8/03
Inventor 何振奎向兴金刘霞胡金鹏刘魁威孙中伟邱建君
Owner CHINA PETROLEUM & CHEM CORP
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