Optimized and Fast Drilling Technology for Deep Shale Gas Horizontal Wells in Luzhou Block

LI Tao; YANG Zhe; XU Weiqiang; YANG Qiang; YANG Zhaoliang

doi:10.11911/syztjs.2022036

Volume 51 Issue 1

Jan. 2023

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Petroleum Drilling Techniques > 2023 > 51(1): 16-21. > DOI: 10.11911/syztjs.2022036

LI Tao, YANG Zhe, XU Weiqiang, et al. Optimized and fast drilling technology for deep shale gas horizontal wells in Luzhou Block [J]. Petroleum Drilling Techniques，2023, 51(1)：16-21. DOI: 10.11911/syztjs.2022036

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Optimized and Fast Drilling Technology for Deep Shale Gas Horizontal Wells in Luzhou Block

1.
Engineering Technology Research Institute, PetroChina Southwest Oil & Gasfield Company, Chengdu, Sichuan, 610017, China
2.
Development Division, PetroChina Southwest Oil & Gasfield Company, Chengdu, Sichuan, 610066, China

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Received Date: March 12, 2022
Revised Date: August 23, 2022
Available Online: November 06, 2022

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Abstract

Abstract

The Longmaxi shale gas reservoirs in Luzhou are deeply buried and have a high temperature. During the drilling process, technical problems such as frequent lost circulation, low rate of penetration (ROP), high failure rate of steering instruments due to high temperature, and long drilling period are frequently encountered. Therefore, on the basis of analyzing the actual formation conditions and technical challenges, the research on optimization of casing program and wellbore trajectory, plugging treatment improvement for lost circulation, selection of efficient bits, surface cooling of oil-based drilling fluid and underbalanced drilling technologies were conducted. As a result, an optimized and fast drilling technology for deep shale horizontal well in Luzhou Block was developed. This technology was applied to 34 shale gas horizontal wells in Luzhou Block. Average drilling depth of the wells was 5 760 m and the average length of horizontal sections was 1 890 m. In addition, the average ROP was increased from 5.61 m/h to 7.03 m/h. The inclined and horizontal sections were completed in one trip and the drilling footage of a single trip reached 2 330 m, which created a new record. The optimized and fast drilling technology for deep shale gas horizontal wells in Luzhou Block has ensured the safe drilling of deep shale gas, improved ROP and efficiency. It can provide a technical reference for ROP improvement of deep shale gas horizontal wells in other regions.
- deep shale gas,
- horizontal well,
- ROP improvement,
- lost circulation,
- bit selection,
- cooling of drilling fluid,
- underbalanced drilling,
- Luzhou Block

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