鄂尔多斯盆地神府区块深部煤层气井产量主控因素及合理压裂规模优化

Main controlling factors of production and reasonable fracturing scale optimization of deep coalbed methane wells in Shenfu block, Ordos Basin

孙立春 刘佳 李娜 李新泽 文恒

SUN Lichun LIU Jia LI Na LI Xinze WEN Heng

1. 中海石油(中国)有限公司 北京研究中心, 北京 100028; 2. 中联煤层气有限责任公司, 北京 100016

1. Beijing Research Center of CNOOC, Beijing 100028, China; 2. China United Coalbed Methane Co., Ltd., Beijing 100016, China

鄂尔多斯盆地神府区块深层煤层气井产量差异大，主控因素认识不清。为进一步揭示神府区块深层煤层气井生产规律，查明气井产能关键影响因素，指导深层煤层气高效开发，基于神府区块基础地质资料、生产数据和前人研究成果，剖析了区内典型煤层气井生产动态特征，从单井对比、整体规律上认识神府区块深层煤层气井产量主控因素，其中含气量和压裂规模对产量影响较大。利用皮尔逊多元相关系数回归技术对各产能影响因素进行了定量评价，确定深层煤层气压后产能的影响因素，按相关性排序依次为：含气量>压裂砂量>施工排量>压裂液量>构造深度>厚度。明确地质条件一定时，合理的压裂规模是深部煤层气井高效开发的关键。并综合不同专业形成了“地质气藏—压裂—经济评价”多专业一体化研究方法，以经济效益为目标，利用数值模拟方法进行深层煤层气井井距和压裂规模耦合优化研究，确定神府区块最优井距为300 m、最优簇间距20 m、最优裂缝半长120 m，为神府区块深层煤层气资源高效开发提供技术支撑。

The production of deep coalbed methane (CBM) wells in the Shenfu block of Ordos Basin varies greatly, with a lack of understanding of the main controlling factors. To further reveal the production patterns in deep CBM wells, identify key factors affecting well production capacity, and guide the efficient development of deep CBM resources in the Shenfu block, this study analyzed the production dynamic characteristics of typical CBM wells in the area based on basic geological data, production data, and previous research results. Through individual well comparisons and overall trend analysis, the main controlling factors influencing CBM well production in the Shenfu block were identified. The results showed that the gas content and fracturing scale have the greatest impact on production. Pearson’s multivariate correlation regression analysis was used to quantitatively evaluate the impact of various factors on production capacity. The factors affecting post-fracturing production capacity of deep CBM wells, ranked by correlation, are as follows: gas content > fracturing sand amount > construction flow rate > fracturing fluid volume > structural depth > thickness. Under certain geological conditions, a reasonable fracturing scale is key to the efficient development of deep CBM wells. An integrated “geological reservoir, fracturing, and economic evaluation” approach was adopted, with economic benefits as the objective. Numerical simulation was conducted to study the coupled optimization of well spacing and fracturing scale. The results determined that the optimal well spacing for the Shenfu block was 300 m, the optimal cluster spacing was 20 m, and the optimal fracture half-length was 120 m. These findings provide technical support for the efficient development of deep CBM resources in the Shenfu block.

中海石油(中国)有限公司“十四五”重大科技项目课题7“临兴神府深层煤层气赋存机理及与致密气协同开发关键技术研究”(KJGG-2024-1007)资助。

https://doi.org/10.11781/sysydz2025010043