大幅提高超深致密砂岩气藏采收率对策与实践——以塔里木盆地克拉苏气田为例  

Measures and practice for improving the recovery factor of ultradeep tight sandstone gas reservoirs: A case study of Kelasu Gas Field, Tarim Basin

作　　者：李国欣 田军[3] 段晓文 杨海军[3] 唐永亮[3] 张承泽[3] 毕海滨[4] 鲜成钢 刘合[4] LI Guoxin;TIAN Jun;DUAN Xiaowen;YANG Haijun;TANG Yongliang;ZHANG Chengze;BI Haibin;XIAN Chenggang;LIU He(State Key Laboratory of Petroleum Resources and Prospecting,Beijing 102249,China;PetroChina Exploration&Production Company,Beijing 100007,China;PetroChina Tarim Oilfield Company,Korla,Xinjiang 841000,China;PetroChina Research Institute of Petroleum Exploration&Development,Beijing 100083,China)

机构地区：[1]油气资源与探测国家重点实验室 [2]中国石油勘探与生产公司 [3]中国石油塔里木油田公司 [4]中国石油勘探开发研究院

出　　处：《天然气工业》2022年第1期93-101,共9页Natural Gas Industry

基　　金：中国石油天然气股份有限公司重大科技专项“库车坳陷深层—超深层天然气田开发关键技术研究与应用”(编号:2018E-1803)。

摘　　要：克拉苏致密砂岩气藏位于中国塔里木盆地库车坳陷克拉苏构造带,已探明天然气地质储量超万亿立方米,已成为中国石油塔里木油田天然气上产的主要战场。由于目的层埋藏深度大、构造复杂、断裂发育、储层致密、温度压力高、水体复杂,高效开发面临极大挑战。为了提高致密砂岩气藏最终采收率,在深化气藏地质及动态特征研究的基础上,深入分析了影响致密气藏采收率的影响因素,并建立了与该区气藏特征相匹配的开发对策体系,大幅提升了气藏的采收率。研究结果表明:①气藏可分为冲起式弱边底水、冲起式有限边底水、叠瓦断片式弱边水、叠瓦断片式有限边水和叠瓦断片式强边底水等五种类型;②非均匀水侵是影响气藏采收率的最主要因素,水侵规律与地质特征和开发参数密切相关;③针对气藏不同特征提出了差异化的布井方式、井网井型、储层改造方式、采气速度、防水控水等一系列开发技术对策。研究结论认为,采用新的开发对策后,新近投产气藏出现无明显不均衡水侵,气藏采收率较早期投产气藏可提高10%~15%,为全球其他地区超深致密砂岩气藏的高效开发提供了宝贵的开发经验和借鉴。Kelasu tight sandstone gas reservoir is located in Kelasu structure zone of Kuqa Depression, Tarim Basin, and its proved gas in place exceeds one trillion cubic meters. It has already become the main battle field for natural gas production increase in PetroChina Tarim Oilfield. However, its efficient development faces great challenges due to great burial depth of target layer, complex structure,developed fault, tight reservoir, high temperature and pressure and complex water body. In order to improve the ultimate recovery factor of tight sandstone gas reservoirs, this paper further studies its geological and dynamic characteristics. Then, the factors influencing the recovery factor of tight gas reservoirs are analyzed and the development measure system matching the characteristics of the gas reservoirs in this area is established, so that the recovery factor is improved greatly. And the following research results are obtained. First,gas reservoirs can be classified into five types, namely lifting gas reservoirs with weak edge and bottom water, lifting gas reservoirs with limited edge and bottom water, imbricate faulted gas reservoirs with weak edge water, imbricated faulted gas reservoirs with limited edge water and imbricate faulted gas reservoirs with strong edge and bottom water. Second, nonuniform water invasion is the most important factor influencing the recovery factor of gas reservoirs, and the law of water invasion is in close relation to geological characteristics and development parameters. Third, a series of development technologies and measures are put forward based on different characteristics of gas reservoirs, including differential spacing pattern, well pattern, well type, reservoir stimulation mode, gas recovery rate and water control. In conclusion, after the application of the new development measures, the gas reservoir which is put into production recently has no obvious nonuniform water invasion and its recovery factor is 10%-15% higher than that of the gas reservoir which is put into produc

关 键 词：塔里木盆地 克拉苏气田 超深 高温高压 致密砂岩气藏 开发对策 提高采收率 

分 类 号：TE377[石油与天然气工程—油气田开发工程]