毕节试验区煤层气开发分支井类型优选

油气藏评价与开发

毕节试验区煤层气开发分支井类型优选

步玉环^1,2, 路通^1,2, 路畅³, 向刚^4,5, 郭胜来^1,2

1.非常规油气开发教育部重点实验室中国石油大学（华东）,山东青岛 266580;
2.中国石油大学（华东）石油工程学院,山东青岛 266580;
3.青岛理工大学环境与工程学院,山东青岛 266520;
4.自然资源部复杂构造区非常规天然气评价与开发重点实验室,贵州贵阳 550009;
5.贵州省油气勘查开发工程研究院,贵州贵阳 550009

收稿日期:2024-11-05
通讯作者: 路通（2001—）,男,硕士,从事煤层气多分支水平井研究。地址：山东省青岛市黄岛区长江西路66号,邮政编码：266580。E-mail：1534605235@qq.com
作者简介:步玉环（1966—）,女,博士,教授,从事油气井化学与工程、油气井力学与工程、固井与完井工程、井筒完整性、新型固井材料方向研究。地址：山东省青岛市黄岛区长江西路66号,邮政编码：266580。E-mail：buyuhuan@163.com
基金资助:
贵州省科技计划项目“贵州高阶煤储层多分支水平井煤层气开发的关键理论与技术研究”（黔科合支撑[2023]一般369）; 贵州省地质勘查资金项目“毕节试验区煤层气资源调查评价与开发技术研究”（52000021MGQSE7S7K6PRP）

Optimisation of lateral well types for coalbed methane development in Bijie test area

BU YUHUAN^1,2, LU TONG^1,2, LU CHANG³, XIANG GANG^4,5, GUO SHENGLAI^1,2

1. Key Laboratory of Unconventional Oil & Gas Development, Ministry of Education, China University of Petroleum (East China), Qingdao, Shandong 266580, China;
2. School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, Shandong 266580, China;
3. School of Environmental and Municipal Engineering , Qingdao University of Technology, Qingdao, Shandong 266580, China;
4. Key Laboratory of Unconventional Natural Gas Evaluation and Development in Complex Tectonic Areas, Minisrtry of Natural Resources, Guiyang, Guizhou 550009, China;
5. Guizhou Institute of Petroleum Exploryation and Development Engineering, Guiyang, Guizhou 550009, China

Received:2024-11-05

摘要/Abstract

摘要： 多分支水平井是煤层气高效开发方式之一,具有较高的产能潜力。研究选取贵州省毕节试验区作为研究对象,该区域煤层气资源丰富,地质储量可观,整体构造相对简单,无较大断裂带发育,具有典型的煤层气开发地质特征。为探究适合毕节试验区的分支井类型,研究基于PETREL软件建立煤层气数值模拟模型,分析鱼骨状分支井和扇形分支井2种典型多分支井型在煤层气开发中的产能影响规律,研究过程中,重点考察了分支角度、分支长度、分支间距等关键参数对产能的影响,并通过数值模拟方法定量评价了2种井型的开发效果差异。同时还综合对比分析了两者在钻进难度、施工成本、适应性方面的差异。研究结果表明：在一定范围内,鱼骨状分支井产能随分支长度增大,分支井波及范围增大,产量也随之增大但增大到一定程度,产能增幅减小;鱼骨状分支井产能随分支角度、分支数量、井斜角的增大而增大。扇形分支井主井筒夹角介于30°~90°时,随夹角增大,日产气量增大;在一定条件下,产能随分支长度增大而增大,但达到一定程度后增长减缓。扇形分支井分支角度和数量增大时,产能也增大。鱼骨状分支井在复杂地层条件下适应性更强,能够有效降低钻进难度和施工成本,而扇形分支井在提高单井产能方面表现更为突出。因此,在实际煤层气开发中,需综合考虑地质条件、经济成本和技术水平等因素,选择合适的分支井类型,以实现最佳的开发效果和经济效益。研究为毕节试验区及类似地区煤层气高效开发提供了理论依据和实践价值。

关键词: 分支井, 煤层气, 压降模型, 产能分析, 钻井难度

Abstract: Multi-lateral horizontal wells are one of the efficient development methods for coalbed methane, with high production potential. This study selects the Bijie area in Guizhou Province as the research object. This region is rich in coalbed methane resources, with considerable geological reserves. The overall structure is relatively simple, and there are no major fault zones developed. It has typical geological characteristics for coalbed methane development. To explore the suitable lateral well types for the Bijie area, this paper establishes a numerical simulation model of coalbed methane based on the Petrel software. It studies the production capacity influence laws of two typical multi-lateral well types, namely fishbone-shaped lateral wells and fan-shaped lateral wells, in the development of coalbed methane. During the research process, the influences of key parameters such as lateral angle, lateral length, and lateral spacing on production capacity are mainly investigated. The development effect differences between the two well types are quantitatively evaluated through numerical simulation methods. At the same time, this paper also comprehensively compares and analyzes the differences between the two in terms of drilling difficulty, construction cost, and adaptability. The research results show that within a certain range, the production capacity of fishbone-shaped lateral wells increases with the increase of lateral length, the affected range of lateral wells increases, and the production also increases, but the increase rate decreases to a certain extent. The production capacity of fishbone-shaped lateral wells increases with the increase of lateral angle, lateral number, and well deviation angle. For fan-shaped lateral wells, when the main wellbore angle is 30°-90°, the daily gas production increases with the increase of the angle. The production capacity increases with the increase of lateral length, but the growth rate slows down after reaching a certain level. The production capacity also increases with the increase of lateral angle and number. Fishbone-shaped lateral wells have stronger adaptability in complex geological conditions and can effectively reduce drilling difficulty and construction costs, while fan-shaped lateral wells perform better in increasing single-well production capacity. Therefore, in actual coalbed methane development, it is necessary to comprehensively consider geological conditions, economic costs, and technical levels, and select the appropriate lateral well type to achieve the best development effect and economic benefits. This study provides theoretical basis and practical value for the efficient development of coalbed methane in the Bijie area and similar regions.

Key words: lateral wells, coalbed methane, pressure drop model, production analysis, difficulty of drilling

中图分类号:

TE22

步玉环,路通,路畅, 等. 毕节试验区煤层气开发分支井类型优选[J]. 油气藏评价与开发, 0, (): 2024504-2024504.

BU YUHUAN,LU TONG,LU CHANG, et al. Optimisation of lateral well types for coalbed methane development in Bijie test area[J]. Petroleum Reservoir Evaluation and Development, 0, (): 2024504-2024504.

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