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Water-based non-clay drilling fluid having strong inhibition

A clay-free, strong inhibition technology, applied in drilling equipment and other directions, which can solve problems such as wellbore collapse, reduced ROP, and deterioration of drilling fluid performance.

Inactive Publication Date: 2005-01-19
DRILLING TECHNOLOGY RESEARCH INSTITUTE OF XINJIANG PETROLEUM ADMINISTRATION BURE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When drilling into magmatogenic mudstone formations or water-sensitive mudstone formations, on the one hand, the drill cuttings are not easily removed through solid control equipment after hydration and dispersion, and the solid phase content in the drilling fluid increases, which deteriorates the performance of the drilling fluid; ROP reduction
On the other hand, the mudstone formation is easy to hydrate and expand after absorbing water, resulting in shrinkage or peeling off blocks after hydration dispersion, and in severe cases, the well wall collapses

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Prepare water-based clay-free strong inhibition drilling fluid from the following components (% weight volume percentage)

[0026] Water + 0.4% hydrophobic polymer + 0.8% CMS + 2.5% sulfonated phenolic resin + 2.5% humic acid multi-polymer + 15% potassium formate + 0.3% potassium hydroxide + 0.5% lime + 4% emulsified asphalt + 60% iron Mineral powder + 0.8% lubricant

Embodiment 2

[0028] Prepare water-based clay-free strong inhibition drilling fluid from the following components (% weight volume percentage)

[0029] Water + 0.4% hydrophobic polymer + 0.8% CMS + 2.5% sulfonated phenolic resin + 2.5% humic acid multi-polymer + 12% potassium chloride + 0.3% potassium hydroxide + 0.5% lime + 4% emulsified asphalt + 60% Iron ore powder + 0.8% lubricant

Embodiment 3

[0031] Prepare water-based clay-free strong inhibition drilling fluid from the following components (% weight volume percentage)

[0032] Water + 0.2% hydrophobic polymer + 0.6% CMS + 1.5% sulfonated phenolic resin + 1.5% humic acid multi-polymer + 3% potassium formate + 0.1% potassium hydroxide + 0.5% lime + 2% emulsified asphalt + 60% iron Mineral powder + 0.5% lubricant

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PUM

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Abstract

The invention relates to a water-based non-clay drilling fluid having strong inhibition which comprises, 0.2%-0.5% of construction agent, 0.8%-6% of at least a fluid loss additive, 3%-25% of at least an inhibiting agent, 0.2%-0.8% of at least a pH conditioning agent, and balancing water.

Description

technical field [0001] The invention relates to a drilling fluid used in the field of petroleum drilling engineering, which belongs to a drilling fluid which has a strong inhibitory effect on water-sensitive shale. Background technique [0002] Drilling fluid is a working fluid that has multiple functions during the drilling process, such as carrying and removing cuttings, cooling and lubricating the drill bit, balancing formation pressure, protecting the stability of the wellbore wall and protecting the oil layer from damage. Its performance directly affects drilling efficiency, downhole safety and Cost control is an important part of drilling engineering technology. [0003] In oil exploration and development, due to the wide distribution of work areas and the complex geological conditions of the strata encountered, the drilling practice of a large number of complex wells shows that the problem of wall instability in shale well sections has always been a technical problem ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
Inventor 黄治忠刘亚峰
Owner DRILLING TECHNOLOGY RESEARCH INSTITUTE OF XINJIANG PETROLEUM ADMINISTRATION BURE
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