Technique of High-Performance Water-Based Drilling Fluid for Continental Shale Oil in Subei Basin

GAO Shuyang

doi:10.11911/syztjs.2024061

Volume 52 Issue 4

Aug. 2024

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Petroleum Drilling Techniques > 2024 > 52(4): 51-56. > DOI: 10.11911/syztjs.2024061

GAO Shuyang. Technique of high-performance water-based drilling fluid for continental shale oil in Subei Basin [J]. Petroleum Drilling Techniques, 2024, 52(4)：51-56. DOI: 10.11911/syztjs.2024061

Citation:

GAO Shuyang. Technique of high-performance water-based drilling fluid for continental shale oil in Subei Basin [J]. Petroleum Drilling Techniques, 2024, 52(4)：51-56. DOI: 10.11911/syztjs.2024061

Citation:

GAO Shuyang. Technique of high-performance water-based drilling fluid for continental shale oil in Subei Basin [J]. Petroleum Drilling Techniques, 2024, 52(4)：51-56. DOI: 10.11911/syztjs.2024061

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Technique of High-Performance Water-Based Drilling Fluid for Continental Shale Oil in Subei Basin

GAO Shuyang^{1, 2,}

1.
State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing, 102206, China
2.
SinopecResearch Institute of Petroleum Engineering Co., Ltd., Beijing, 102206, China

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Received Date: December 03, 2023
Revised Date: June 22, 2024
Accepted Date: July 23, 2024
Available Online: July 28, 2024

Graphical Abstract

Abstract

Abstract

In order to solve the technical problems such as borehole instability and environmental pollution faced by conventional oil-based drilling fluid in the shale oil working area of Subei Basin during drilling, a new control method of borehole stability was put forward, featuring external waterproofing and internal expansion control by studying the mechanism of borehole instability. The technical measures of “dominant plugging + strengthened inhibition + wetting reversal + reasonable density” was developed, and the key additives such as deformable micro-nano polymer plugging agent, shale wetting reversal agent, and crude oil emulsifying dispersion viscosity reducing agent were developed. Finally, a high-performance water-based drilling fluid system, SM-ShaleMud-II, was established. The high temperature and high pressure filtration loss of the drilling fluid system was less than 6.0 L, and the extreme pressure lubrication coefficient was less than 0.12, which could effectively reduce the weakening degree of the mechanical properties of the reservoir shale. The drilling fluid was applied to 10 wells in the shale oil area of Subei Basin, ensuring borehole stability and smooth casing running and achieving good application results. The successful development of high-performance water-based drilling fluid, SM-ShaleMud-II, provides an effective technical means for low-cost and green development of unconventional shale oil and gas.
- Subei Basin,
- shale oil,
- water-based drilling fluid,
- wellbore stability,
- drilling fluid additives

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References

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