低渗透油藏二氧化碳混相驱注采方式研究——以克拉玛依油田X区克下组低渗透油藏为例  

Optimum selection of injection-production method for carbon dioxide miscible flooding in low permeability reservoirs:Taking the low-permeability reservoirs of the Kexia Formation in the X zone of the Karamay Oilfield as an example

作　　者：李玮 师庆三 董海海[2] 侯锐 LI Wei;SHI Qingsan;DONG Haihai;HOU Rui(College of Geology and mining engineering,Xinjiang University,Urumqi 830047,Xinjiang,China;Xinjiang Oil Field Co exploration and Development Research Institute,Karamay 834000,Xinjiang,China;Xinjiang Zheng Tian Huaneng Environmental Engineering Technology Co.,Ltd.,Urumqi 830047,Xinjiang,China)

机构地区：[1]新疆大学地质与矿业工程学院,新疆乌鲁木齐830047 [2]新疆油田公司勘探开发研究院,新疆克拉玛依834000 [3]新疆正天华能环境工程技术有限公司,新疆乌鲁木齐830047

出　　处：《中国地质》2022年第2期485-495,共11页Geology in China

基　　金：国家科技重大专项(2016ZX05016-004)资助。

摘　　要：【研究目的】克拉玛依油田X区克下组低渗透油藏存在物性差、水驱开发采收率低等问题,影响了油田的可持续发展。CO_(2)是全球变暖的主要成分,世界各国都在想方设法减少CO_(2)的排放量,本文试图利用CO_(2)驱油气方式提高该油藏的采收率,变害为利。【研究方法】文章选取研究区60余口取心井目标层位岩心样品,开展扫描电镜及压汞测试分析等研究,系统梳理储层孔隙结构特征。采用油藏数值模拟方法对CO_(2)连续气驱与CO_(2)水气交替驱参数进行了优选,对比了各种开发方式的驱油效果。【研究结果】最后得到了最优的驱油方案:采用CO_(2)水气交替驱方法,15口井连续注气4年后全部转水气交替注入,气水比为2∶1;气水比10年后调整为1∶1。数值模拟预测,注气开发15年,预测最终采收率将提高30%。【结论】通过现场试注结果表明,试采效果注气后产油量较水驱阶段有明显提高,试采效果注气后产油量是水驱阶段的1.85倍,有明显提高,对实现老区稳产和油田可持续发展具有十分重要的意义。This paper is the result of oil and gas exploration engineering.[Objective] The low-permeability reservoirs of the Kexia Formation in the X zone of the Karamay Oilfield have problems such as poor physical properties and low waterflooding development and recovery, which affect the sustainable development of the oilfield.CO_(2)is the main component of global warming, every country in the world is trying to reduce its content in the atmosphere. This research attempts to use CO_(2)to drive oil and gas to increase the oil production rate in this reservoir and turn bane into a boon. [Methods] According to the core samples of the Lower Karamay formation from more than 60 coring wells in the test area,combined with the data of SEM and mercury injection test, the reservoir characteristics are systematically studied, and the pore structure characteristics of low-permeability sandstone reservoir are clearly studied. Using reservoir numerical simulation technology, the injection and production parameters of CO_(2)water-gas alternating flooding(CO_(2)-WAG) and CO_(2)continuous gas flooding were optimized, and on this basis, the two development modes were compared. [Results] The optimum technical scheme is obtained: using CO_(2)water-gas alternating flooding technology, 15 wells are injected with water-gas alternately after 4 years of continuous gas injection. The gas-water ratio is 2:1, the gas-water ratio is 1:1 after 10 years. The numerical simulation predicts that the final recovery rate is increased by more than 30% after 15 years of gas injection development.[Conclusions] Experiments show that the oil production after gas injection is 1.85 times that of water injection. The output is increased. It is of great significance to achieve stable production in the old oilfieldsand sustainable development of the oilfield.

关 键 词：低渗透油藏 细管试验 CO_(2)水气交替驱 CO_(2)连续气驱 数值模拟 油气勘查工程 克拉玛依油田 新疆 

分 类 号：P618.13[天文地球—矿床学]