渝东南南川地区常压页岩气示范井应用评价及推广效果

Application evaluation and promotion effect of normal pressure shale gas demonstration well in Nanchuan area in southeastern Chongqing

王运海 贺庆 朱智超 龙志平 彭兴 曹建山

WANG Yunhai HE Qing ZHU Zhichao LONG Zhiping PENG Xing CAO Jianshan

1. 中国石化 华东油气分公司, 南京 210019; 2. 中国石化 华东油气分公司 石油工程技术研究院, 南京 210019

1. SINOPEC East China Branch Company, Nanjing, Jiangsu 210019, China; 2. Petroleum Engineering Research Institute, SINOPEC East China Branch Company, Nanjing, Jiangsu 210019, China

渝东南南川地区常压页岩气资源丰富，是页岩气勘探开发的重要地区。该区前期钻井受地质条件复杂和工程技术配套不完善等因素影响，提速提效总体成效与常压页岩气规模效益开发要求存在差距。为此，选取该区阳春沟区块阳页54-3HF井作为首口常压页岩气示范井，攻关形成区域优快钻完井示范技术序列。在分析区域钻井技术难点的基础上，结合地层抗压特性、地层压力系统等基础研究，系统性攻关浅表层穿漏技术、井身结构优化技术、提速工具优选技术、轨迹控制与导向技术、低密度强封堵油基钻井液技术和优快完井技术等钻井关键技术，形成以浅表层工勘、大排量清水抢钻井、优化井身结构、全国产化提速工具配套、低密度强封堵油基钻井液、地质工程一体化导向、低承压井筒环境优快固井技术为核心的低成本优快钻井示范技术体系。示范井钻井周期19.96 d，刷新国内4 500 m井深最短钻井周期，机械钻速24.88 m/h，较同区相同井深最快机械钻速10.29 m/h提高141.79%，优质页岩钻遇率100%，固井质量优秀，起到了良好的示范引领作用。推广应用后，地区机械钻速、钻井周期等各项技术经济指标均得到明显提升，加快了南川地区常压页岩气勘探开发进程。南川地区常压页岩气示范井攻关形成的高效钻完井技术系列能够满足常压页岩气水平井钻井提速提效的要求，有效推动了石油工程“四提”迈上新台阶，为四川盆地周缘类似气田建设奠定了技术基础，助力国内上游稳油增气降本提效。

Nanchuan area in southeastern Chongqing is rich in normal pressure shale gas resources, which is an important area for SINOPEC’s shale gas exploration and development. Due to the complex geological conditions and imperfect engineering technology, the overall efficiency of drilling acceleration and efficiency improvement in this area can not meet the requirements for large-scale benefit-based development of normal pressure shale gas. Therefore, Yangye 54-3HF well in Yangchungou block in this area is selected as the first normal pressure shale gas demonstration well of SINOPEC to research and form a regional optimal and fast drilling and completion demonstration technology series. On the basis of systematic analysis of regional drilling technology difficulties, combined with basic research on formation pressure resistance characteristics and formation pressure system, the demonstration well research systematically explores key drilling technologies such as shallow formation leakage technology, well structure optimization technology, accelerating tool optimization technology, trajectory control and orientation technology, low-density strong plugging oil-based drilling fluid technology, and optimal fast completion technology. A low-cost, optimal, and fast drilling demonstration technology system with the core of shallow formation prospecting, large-capacity clean water drilling, optimized well structure, domestic acceleration tools, low-density and strong plugging oil-based drilling fluid, integrated geological engineering orientation, and low-pressure wellbore fast cementing technology is formed. The drilling period of the demonstration well is 19.96 d, which is the shortest drilling period in 4 500 m well depth in China, and the ROP is 24.88 m/h, which is 141.79% higher than the fastest ROP of 10.29 m/h in the similar well depth in the same region. The rate of drilling in high-quality shale is 100%, and the cementing quality is excellent, which has played a good demonstration and leading role. After the promotion and application, various technical and economic indicators such as the regional ROP and drilling period have been significantly improved, speeding up the exploration and development process of normal pressure shale gas in Nanchuan area. The practice of normal pressure shale gas demonstration wells in Nanchuan area has shown that the efficient drilling and completion technology series formed by the demonstration well research can meet the requirements of drilling acceleration and efficiency improvement in horizontal wells of normal pressure shale gas, effectively promoting the four improvements in petroleum engineering to a new level, and laying a technical foundation for the construction of similar gas fields around the Sichuan Basin, and helping achieve greater progress in stabilizing oil and gas production, reducing costs, and improving efficiency in the upstream industry in China.

国家重大科技专项(2016ZX05061)和中国石化科技部项目(P19017)联合资助。

https://doi.org/10.11781/sysydz2023061160