Research progress of coalbed methane horizontal well drilling and completion technology in China

doi:10.7623/syxb202311017

Acta Petrolei Sinica ›› 2023, Vol. 44 ›› Issue (11): 1974-1992.DOI: 10.7623/syxb202311017

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Research progress of coalbed methane horizontal well drilling and completion technology in China

Xian Bao'an¹, Gao Deli², Xu Fengyin³, Bi Yansen², Li Guichuan⁴, Wang Jingguang⁵, Zhang Yang⁶, Han Jinliang⁷

1. School of Resources and Environment, Henan Polytechnic University, Henan Jiaozuo 454000, China;
2. MOE Key Laboratory of Petroleum Engineering, China University of Petroleum, Beijing 102249, China;
3. China United Coalbed Methane National Engineering Research Center Co., Ltd., Beijing 100095, China;
4. Innovation Center of Three-gas Co-production Technology, China United Coalbed Methane (Shanxi)Co., Ltd., Shanxi Taiyuan 030012, China;
5. Research Institute of Drilling and Production Technology, CNPC Chuanqing Drilling Engineering Co., Ltd., Shaanxi Xi'an 710018, China;
6. PetroChina Huabei Oilfield Company, Hebei Renqiu 062550, China;
7. Research Institute of Engineering Technology, PetroChina Coalbed Methane Company Limited, Shaanxi Xi'an 710082, China

Received:2023-06-30 Revised:2023-09-25 Online:2023-11-25 Published:2023-12-08

中国煤层气水平井钻完井技术研究进展

鲜保安¹, 高德利², 徐凤银³, 毕延森², 李贵川⁴, 王京光⁵, 张洋⁶, 韩金良⁷

1. 河南理工大学资源环境学院河南焦作 454000;
2. 中国石油大学(北京)石油工程教育部重点实验室北京 102249;
3. 中联煤层气国家工程研究中心有限责任公司北京 100095;
4. 中联煤层气(山西)有限责任公司三气共采技术创新中心山西太原 030012;
5. 中国石油集团川庆钻探工程有限公司钻采工程技术研究院陕西西安 710018;
6. 中国石油华北油田公司河北任丘 062550;
7. 中石油煤层气有限责任公司工程技术研究院陕西西安 710082

通讯作者: 高德利,男,1958年4月生,1990年获石油大学(北京)博士学位,现为中国科学院院士、中国石油大学(北京)教授、石油工程教育部重点实验室主任,长期从事油气井力学与控制工程、定向钻井、井筒完整性、深水钻井及工程作业极限、非常规油气大型井工厂钻完井技术等方面的科学研究与技术创新工作。Email:gaodeli@cup.edu.cn;毕延森,男,1986年3月生,2020年获中国石油大学(北京)硕士学位,现为中国石油大学(北京)博士研究生,主要从事水平井钻完井工艺技术、非常规天然气完井增产等方面的科研工作。Email:biyansen2014@163.com
作者简介:鲜保安,男,1966年12月生,2006年获中国石油大学(北京)博士学位,现为河南理工大学教授、博士生导师,主要从事煤层气水平井钻完井与增产技术等方面的科研及教学工作。Email:759267753@qq.com
基金资助:
国家自然科学基金重点项目"复杂结构‘井工厂’立体设计建设基础研究"（No.52234002）和国家自然科学基金重点项目"煤层气低产储层靶向改造增产关键理论及技术基础"（No.42230814）资助。

Abstract

Abstract: In response to the complex geological conditions and physical characteristics of coal seams in China, the horizontal drilling and completion technology has been continuously studied and developed. Based on the "well factory" mode, well type optimization, reservoir protection, geosteering drilling and adaptive horizontal completion technologies have been established, gradually becoming the key measures for the efficient exploitation of coalbed methane (CBM) in China. To provide technical support for CBM horizontal drilling and completion engineering, this paper briefly reviews the research progress of domestic CBM horizontal drilling and completion technology, and focuses on the innovative research results:(1) The integrated technology of double tubular strings completion and stimulation for coal seams in horizontal wells is developed. This technology has been applied in more than 400 wells in the southern Qinshui Basin and achieved a breakthrough in technology and production; the radial cyclic load test of coal is carried out, and the formation and propagation of fractures in coal are detected by CT scanning; the calculation model of coal damage variable under radial cyclic stress is modified based on the dual pore structure, heterogeneity and multi-scale pores of coal. (2) The hydraulic driving mechanism of flexible screen pipe with inner tubing is proposed for radial horizontal completion; the tubular string structure and supporting tools are designed and optimized, and the mechanic-hydraulic coupling calculation model is established. Taking the radial horizontal well in deep coal seam as an example, the maximum install length of the two completion strings are 381 and 655 m, respectively, which provides technical guidance for screen completion of radial wells. (3) The mechanism of muti-type stimulation for horizontal well with compose liners in coal seam with complicated coal structure is expounded and the crack propagation of hydraulic fracturing with cyclic shock wave pre-cracking is numerically simulated. The production of a shut-down well is increased to 2 000 m³/d by this technology. Finally, the key development points of CBM horizontal drilling and completion technologies are summarized. The matching technology of large well factory will become the key technology to increase the efficiency of CBM exploitation and reduce the cost. The multi-constraint trajectory optimization design and control technology are the technical guarantee for safe and rapid drilling of horizontal wells in deep coal seams. The diversified completion and stimulation techniques of horizontal wells will be an innovative mode for the efficient development of deep CBM in China.

Key words: coalbed methane, horizontal well drilling and completion, large well factory, multi-type completion and stimulation, deep coal seam

摘要： 为了适应中国煤层复杂的地质条件与储层物性特征，水平井钻完井技术不断得以深化研究与发展，围绕"井工厂"形成了井型优化、储层保护、导向钻井和水平井适应性完井技术，逐渐成为中国煤层气高效开发的重要措施。为煤层气高效开发提供钻完井工程方面的技术支持，通过概述中国煤层气水平井钻完井技术研究进展，重点介绍了煤层气水平井完井技术3项研究成果：①形成了煤层水平井双管柱完井与增透一体化技术，在沁水盆地南部应用400余口井，并取得技术与产量突破；开展了井壁煤岩径向循环载荷实验，通过CT扫描技术检测了煤岩裂缝形成与扩展；基于煤岩双孔隙结构、非均质性和孔隙多尺度特征，修正了径向循环载荷下煤岩损伤变量计算模型。②提出了径向水平井柔性筛管液压驱动下入方法，优化设计了完井管柱结构与配套工具，建立了管柱-液压耦合计算模型，以深部煤层径向水平井为算例，计算两种完井管柱结构的最大下入长度分别达到381 m、655 m，为径向井筛管完井提供技术指导。③提出了复杂煤体结构煤层水平井分段复合完井增透方法，数值模拟了循环冲击波辅助水力压裂煤层裂缝扩展规律，通过该技术使停产井增产至2 000 m³/d。最后，概括了深部煤层气水平井钻完井发展技术要点，以大型"井工厂"为核心的配套技术将成为煤层气开发降本增效的关键技术，多约束条件轨道优化设计和控制技术是深部煤层水平井优快钻井的技术保障，水平井多元化完井增产技术将成为中国深部煤层气高效开发的新模式。

关键词: 煤层气, 水平井钻完井, 大型井工厂, 复合完井增产, 深部煤层

CLC Number:

TE24

Xian Bao'an, Gao Deli, Xu Fengyin, Bi Yansen, Li Guichuan, Wang Jingguang, Zhang Yang, Han Jinliang. Research progress of coalbed methane horizontal well drilling and completion technology in China[J]. Acta Petrolei Sinica, 2023, 44(11): 1974-1992.

鲜保安, 高德利, 徐凤银, 毕延森, 李贵川, 王京光, 张洋, 韩金良. 中国煤层气水平井钻完井技术研究进展[J]. 石油学报, 2023, 44(11): 1974-1992.

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Research progress of coalbed methane horizontal well drilling and completion technology in China

中国煤层气水平井钻完井技术研究进展

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