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Method for improving shale well wall stability by controlling wettability of water-based drilling fluid

A water-based drilling fluid and drilling fluid technology, applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problem of changing the wettability of drilling fluid

Inactive Publication Date: 2016-04-20
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This patent determines the requirements for the wettability parameters of oil-based drilling fluid through the physical and structural properties of formation rocks, mainly for oil-based drilling fluid, but does not propose how to change the wettability of drilling fluid

Method used

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  • Method for improving shale well wall stability by controlling wettability of water-based drilling fluid
  • Method for improving shale well wall stability by controlling wettability of water-based drilling fluid
  • Method for improving shale well wall stability by controlling wettability of water-based drilling fluid

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Effect test

Embodiment 1

[0036] This embodiment provides a method for enhancing the stability of the shale well wall by controlling the wettability of the water-based drilling fluid. The method is to add a compound cationic surfactant and anionic surfactant to the water-based drilling fluid; the addition method is Use GJD-B12K frequency conversion high-speed mixer to stir and mix at the speed of 2000r / min.

[0037] The cationic surfactant is cetyltrimethylammonium bromide, and the anionic surfactant is sodium dodecylbenzenesulfonate;

[0038] Based on 100mL of water-based drilling fluid, the amount of CTAB added is 0.18g, and the amount of ABS added is 0.1g.

[0039] The obtained water-based drilling fluid (abbreviated as water-based drilling fluid based on composite surfactant) added compound cationic surfactant and anionic surfactant is tested, and the main reflections are: (1) based on composite surfactant Basic performance parameters of water-based drilling fluid (apparent viscosity, plastic visc...

Embodiment 2

[0055] This embodiment provides a method for enhancing the stability of the shale well wall by controlling the wettability of the water-based drilling fluid. The method is to add a compound cationic surfactant and anionic surfactant to the water-based drilling fluid; the addition method is Use GJD-B12K frequency conversion high-speed mixer to stir and mix at the speed of 2000r / min.

[0056] The cationic surfactant is cetyltrimethylammonium bromide, and the anionic surfactant is sodium dodecylbenzenesulfonate;

[0057] Based on 100mL of water-based drilling fluid, the amount of CTAB added is 0.22g, and the amount of ABS added is 0.1g.

[0058] The obtained water-based drilling fluid (abbreviated as water-based drilling fluid based on composite surfactant) added compound cationic surfactant and anionic surfactant is tested, and the main reflections are: (1) based on composite surfactant Basic performance parameters of water-based drilling fluid (apparent viscosity, plastic visc...

Embodiment 3

[0070] This embodiment provides a method for enhancing the stability of the shale well wall by controlling the wettability of the water-based drilling fluid. The method is to add a compound cationic surfactant and anionic surfactant to the water-based drilling fluid; the addition method is Use GJD-B12K frequency conversion high-speed mixer to stir and mix at the speed of 2000r / min.

[0071] The cationic surfactant is cetyltrimethylammonium bromide, and the anionic surfactant is sodium dodecylbenzenesulfonate;

[0072] Based on 100mL of water-based drilling fluid, the amount of CTAB added is 0.22 grams, and the amount of ABS added is 0.12 grams.

[0073] The obtained water-based drilling fluid (abbreviated as water-based drilling fluid based on composite surfactant) added compound cationic surfactant and anionic surfactant is tested, and the main reflections are: (1) based on composite surfactant Basic performance parameters of water-based drilling fluid (apparent viscosity, p...

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Abstract

The invention provides a method for improving the shale well wall stability by controlling the wettability of water-based drilling fluid. According to the method, a cationic surface active agent and an anionic surface active agent which are compounded are added into the water-based drilling fluid; based on 100 mL of the water-based drilling fluid, the amount of the cationic surface active agent is 0.18-0.22 g, and the amount of the anionic surface active agent is 0.08-0.42 g; the anionic surface active agent is sodium dodecyl benzene sulfonate or sodium dodecyl sulfate. According to the method, through the synergistic effect of the two surface active agents, the surface tension of the drilling fluid is reduced, the water locking effect is alleviated, the contact angle of the water-based drilling fluid and shale is enlarged, the pore pressure transmission is prevented and delayed, the contact area of the drilling fluid and shale is decreased, the intrusion degree of the drilling fluid into shale is reduced, the hydrophilicity of shale to the drilling fluid is reduced, and the shale well wall stability is further improved.

Description

technical field [0001] The invention provides a method for enhancing the stability of shale well walls by controlling the wettability of water-based drilling fluid, and belongs to the technical field of shale gas horizontal well drilling. Background technique [0002] Most of the shale gas horizontal wells in my country are concentrated in marine shale formations with thicker reservoirs, strong brittleness and stable distribution. During the drilling of shale horizontal wells, the main problem is the wellbore instability caused by hydration expansion and fracture expansion. For example, if water-based drilling fluid is used for drilling, due to the strong hydrophilicity of shale, it is easy to cause water absorption and swelling, resulting in instability of the wellbore wall. In this regard, oil-based drilling fluid is a better solution, but the resulting environmental and cost problems are unavoidable. [0003] Patent 201510077222.8 discloses a method for designing oil-ba...

Claims

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Application Information

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IPC IPC(8): C09K8/035
CPCC09K8/035
Inventor 蔡记华岳也杨现禹谷穗乌效鸣
Owner PETROCHINA CO LTD
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