Water-based drilling fluid and preparation method thereof

A water-based drilling fluid and drilling fluid technology, which is applied in the field of oil drilling, can solve the problems of inability to effectively solve the instability of hard and brittle mud shale, increase the dosage of conventional plugging agents, and drop blocks in the well, etc. Production application, reducing downhole block drop, low cost effect

Inactive Publication Date: 2015-04-29
CNPC BOHAI DRILLING ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For hard and brittle mud shale, through performance evaluation, it is found that the rolling recovery rate of this kind of cuttings in clear water is very high, generally greater than 50%, and the components basically do not contain or contain a small amount of montmorillonite, mainly illite mixed layer and illite Mainly, it will not be hydrated to ma

Method used

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  • Water-based drilling fluid and preparation method thereof
  • Water-based drilling fluid and preparation method thereof
  • Water-based drilling fluid and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0021] In parts by weight, add 0.25 parts of soda ash, 0.3 parts of high-viscosity xanthan gum, 1 part of low-viscosity anionic cellulose for drilling fluid, 1 part of polyamine inhibitor, 0.5 parts of cationic poly Acrylamide, 6 parts of industrial grade KCl, 1 part of aluminum compound plugging agent, 1 part of micron-sized superfine calcium carbonate and 1 part of nano-sized silicon dioxide, the final density is 4.1g / cm 3 The drilling fluid uses barite powder to increase the density of the drilling fluid system to 1.05g / cm 3 , to obtain the water-based drilling fluid.

Embodiment 2

[0023] In parts by weight, add 0.3 parts of soda ash, 0.5 parts of low-viscosity xanthan gum, 1.5 parts of modified starch, 2 parts of polyamine inhibitors for BZ-JAI drilling fluid, and 0.3 parts of PAC141 to 100 parts of water in a fully stirred state. Coating agent for type drilling fluid, 8 parts of industrial grade KCl, 2 parts of aluminum compound plugging agent for BZ-Alseal type drilling fluid, 2 parts of micron-sized ultrafine calcium carbonate and 3 parts of nano-sized silicon dioxide, and finally add density 4.0g / cm 3 The drilling fluid uses barite powder to increase the density of the drilling fluid system to 1.10g / cm 3 , to obtain the water-based drilling fluid.

Embodiment 3

[0025] In parts by weight, add 0.35 parts of soda ash, 0.25 parts of high-viscosity xanthan gum, 0.25 parts of low-viscosity xanthan gum, and 1 part of low-viscosity polyanionic cellulose for drilling fluid to 100 parts of water successively under stirring at 10,000 rpm , 1 part of modified starch, 2 parts of polyamine inhibitor for BZ-JAI drilling fluid, 0.3 part of potassium polyacrylate, 7 parts of industrial grade KCl, 1 part of aluminum compound plugging agent for BZ-Alseal drilling fluid, 1 1 part of micron-sized superfine calcium carbonate and 1 part of nano-sized silicon dioxide, the final density is 4.2g / cm 3 The drilling fluid uses barite powder to increase the density of the drilling fluid system to 1.20g / cm 3 , to obtain the water-based drilling fluid. .

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Abstract

The invention discloses a water-based drilling fluid and a preparation method thereof. The water-based drilling fluid is prepared by mixing the following components in parts by weight: 100 parts of water, 0.25-0.35 part of sodium carbonate, 0.3-0.5 part of a flow modifier, 1-2 parts of a filtrate reducer, 1-2 parts of an inhibitor, 0.3-0.5 part of a coating agent, 6-8 parts of KCl, 1-2 parts of an aluminum compound blocking agent, 3-5 parts of a micro-nano blocking agent and a balanced amount of barite. Aiming at hard and brittle shale, the water-based drilling fluid has strong inhibition and plugging performances and is beneficial to reinforcing the wall of a well and reducing the generation of wellbore instability, chipping and collapse.

Description

technical field [0001] The invention relates to the field of petroleum drilling, in particular to a micro-nano strong plugging water-based drilling fluid and a preparation method thereof. Background technique [0002] With the expansion of the scope of exploration and development of petroleum resources, especially with the development of unconventional oil and gas resources such as tight oil and gas and shale gas, the wellbore instability of hard and brittle shale has become a key problem that needs to be solved urgently. For hard and brittle mud shale, through performance evaluation, it is found that the rolling recovery rate of this kind of cuttings in clear water is very high, generally greater than 50%, and the components basically do not contain or contain a small amount of montmorillonite, mainly illite mixed layer and illite Mainly, it will not be hydrated to make slurry, but it is easy to hydrate and disperse, causing blocks to fall or even collapse downhole. Past e...

Claims

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Application Information

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IPC IPC(8): C09K8/42
CPCC09K8/08C09K8/10C09K8/12C09K8/42
Inventor 张洪伟李立昌左凤江贾东民刘彦妹张雅欣侯士东马春晖
Owner CNPC BOHAI DRILLING ENG
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