Long open hole and long-immersion formation deepen drilling technology in Well Xinsudi-2

ZHU Disi; MENG Xianglong; WANG Shengjian; WANG Xiaoming; CHEN Zhaoming; CHI Huanpeng; ZHAO Hongbo; GAO Yongjin; LI Dayong; YUE Weimin

doi:10.12143/j.ztgc.2025.01.018

2025 Vol. 52, No. 1

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Article navigation > DRILLING ENGINEERING > 2025 > 52(1): 129-137

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ZHU Disi, MENG Xianglong, WANG Shengjian, WANG Xiaoming, CHEN Zhaoming, CHI Huanpeng, ZHAO Hongbo, GAO Yongjin, LI Dayong, YUE Weimin. 2025. Long open hole and long-immersion formation deepen drilling technology in Well Xinsudi-2. DRILLING ENGINEERING, 52(1): 129-137. doi: 10.12143/j.ztgc.2025.01.018

Citation:

ZHU Disi, MENG Xianglong, WANG Shengjian, WANG Xiaoming, CHEN Zhaoming, CHI Huanpeng, ZHAO Hongbo, GAO Yongjin, LI Dayong, YUE Weimin. 2025. Long open hole and long-immersion formation deepen drilling technology in Well Xinsudi-2. DRILLING ENGINEERING, 52(1): 129-137. doi: 10.12143/j.ztgc.2025.01.018

Long open hole and long-immersion formation deepen drilling technology in Well Xinsudi-2

1. Oil & Gas Survey, China Geological Survey, Beijing 100083, China;
2. Unconventional Oil and Gas Engineering Technology Center, China Geological Survey, Beijing 100083, China;
3. Changsha Uranium Geology Institute, Changsha Hunan 410007, China;
4. No .4 Prospecting Team of Shandong Coal Geology Bureau, Weifang Shandong 261200, China

More Information

Corresponding author: CHEN Zhaoming

Received Date: 27 January 2024

Revised Date: 22 May 2024

Abstract

Abstract

Well Xinsudi-2 is an oil and gas geological survey well deployed in the Xinjiang Tarim Basin. The well was drilled to 2468.50m with an open hole section of 2009.24m. After geological assessment, it was designed to be deepen drilling to 3168m. This article takes the 500~600m well section as an example to analyze the wellbore stability. The wellbore is soaked in drilling fluid for a long time, which causes the water content of the wellbore to increase. The cohesion and internal friction angle of the mudstone and other strength indicators decrease, resulting in the wellbore not having pressure-bearing capacity, slight disturbance will cause the well wall to become unstable. The project team adopted a new anti-pollution polymer anti-collapse drilling fluid system, a drilling tool assembly with a drillwhile-drilling jar to relieve stuck conditions under complex well conditions, and the target layer was drilled using low drilling pressure\low rotational speed\low-displacement parameter combination drilling and other technical methods has solved a series of complex situations caused by long open-hole sections and long time soaked formations, ensured the smooth completion of the project and achieved the geological purpose, and accumulated the experience and technology of drilling long open hole and long-immersion formations.
- oil and gas geological survey wells /
- deepen drilling /
- long open holes /
- long-immersion formation /
- well wall stability /
- drilling complexity /
- drilling fluids

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References

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