柴达木盆地涩北气田提高采收率关键技术与发展方向  

Key technologies and prospect of EGR in the Sebei Gas Field in the Qaidam Basin

作　　者：李江涛[1] 项燚伟 陈汾君 邓成刚[1] 徐晓玲[1] 程鑫 杨会洁 谢梅[1] 唐启银 王海成[1] LI Jiangtao;XIANG Yiwei;CHEN Fenjun;DENG Chenggang;XU Xiaoling;CHENG Xin;YANG Huijie;XIE Mei;TANG Qiyin;WANG Haicheng(Petrochina Qinghai Oilfield Company,Dunhuang,Gansu 736202,China)

机构地区：[1]中国石油青海油田公司

出　　处：《天然气工业》2023年第1期141-152,共12页Natural Gas Industry

基　　金：中国石油天然气股份有限公司科学研究与技术开发项目“复杂天然气田开发关键技术”(编号:2021DJ1705)。

摘　　要：柴达木盆地涩北气田是国内最为典型的规模最大的多层边水疏松砂岩气藏,气田开发过程中,受出水、出砂影响,采收率偏低,提高采收率工作始终贯穿于该气田开发的全过程,但仍然存在瓶颈问题和不适应性。为此,在系统梳理涩北气田试采、建产、稳产、调整阶段开发技术的基础上,重点分析了影响气藏采收率的关键因素,围绕“层间储量均衡动用、平面边水均衡推进、降低井筒压损与废弃压力”思路,提出了提高采收率的关键技术,并在评价实施效果的基础上,指出了未来提高采收率的技术方向。研究结果表明:①影响采收率的因素是储层强敏感性使渗流通道闭塞、边水非均衡指进式侵入、划分单元与开发井网对储量动用控制差、排采与集输工艺不适宜导致气藏废弃压力高等;②低丰度剩余气挖潜、人工干预边水侵入、细分加密提高储量动用、积液积砂助排清堵降阻、增压外输是提高采收率主体技术;③调补建产、内控外排、砂水同治、三级增压等取得显著效果,持续精细挖潜、精准治水和井网重构、注剂驱替是进一步提高采收率的关键。结论认为,形成的提高采收率关键技术高效支撑了涩北气田实现了年产天然气超过50×108m3,连续稳产12年的创举,为打造青海“绿色能源高地”,保障甘青藏三省区天然气供给需求和能源安全做出了积极贡献。The Sebei gas field in the Qaidam Basin is the most typical and largest multi-layer edge-water unconsolidated sandstone gas reservoir in China. Due to water and sand production during field development, the recovery is low. Great efforts on enhancing gas recovery have been exerted in the whole process of field development, but there are still problems of technical bottleneck and inapplicability. Thus, the development technologies in the stages of production test, increase, stabilization and adjustment in the Sebei gas field are reviewed, and the key factors affecting gas recovery are analyzed. The key technologies for improving gas recovery are proposed based on the method of "balanced production of inter-layer reserves, planar balanced advancement of edge water, and reduction in pressure loss within the wellbore and abandonment pressure". The prospect of enhanced gas recovery is proposed. The results are obtained as follows. First, the gas recovery is affected by block of seepage channel due to the strong sensitivity of the reservoir,unbalanced fingering invasion of edge water, poor control of reserve production by the division unit and the development well pattern,and the high abandonment pressure of gas reservoir caused by inapplicable drainage and production and gathering technology. Second, the main technologies for enhancing gas recovery include tapping of low abundance remaining gas, intervention on edge water invasion, layer fine division and infill to improve reserves utilization, removal of fluid and sand accumulation to reduce flow resistance and pressurized gas external transmission. Third, significant progress has been achieved in production construction by layer adjustment, internal control and external drainage, treatment of sand and water production, and three-level pressurization. Continuous fine tapping of remaining gas potential, precise water control, well pattern reconstruction, and injection and displacement of chemical agents are the keys to further enhance gas recovery. It is concluded tha

关 键 词：柴达木盆地 疏松砂岩气田 边水侵入 细分层系 剩余气挖潜 提高采收率 技术实践 

分 类 号：TE377[石油与天然气工程—油气田开发工程]