致密油藏水平井分段压裂CO吞吐实验研究

Experiments of CO Huff-n-puff Process in Staged Fracturing Horizontal Wells for Developing Tight Oil Reservoirs

周拓 刘学伟 王艳丽 秦春光 盖长城

ZHOUTuo LIUXuewei WANGYanli QINChunguang GAIChangcheng

中国科学院渗流流体力学研究所, 河北 廊坊 065007 中国石油天然气勘探开发研究院廊坊分院, 河北 廊坊 065007 中国石油中原石油工程有限公司塔里木分公司, 新疆 库尔勒 841000 中国石油吉林油田公司, 吉林 松原 138000 中国石油冀东油田分公司, 河北 唐山 063200

Institute of Porous Flow and Fluid Mechanics of Chinese Academy of Sciences, Langfang, Hebei 065007, China Langfang Branch of Research Institute of Petroleum Exploration & Development, PetroChina, Langfang, Hebei 065007, China Tarim branch of Zhongyuan Oilfield Company, PetroChina, Korla, Xinjiang 841000, China Jilin Oilfield Company, PetroChina, Songyuan, Jilin 138000, China Jidong Oilfield Company, PetroChina, Tangshan, Hebei 063200, China

目前，某油田正在进行CO吞吐试验，该油田属于致密油藏，分段压裂水平井CO吞吐效果受诸多因素制约，急需通过物理模拟方法研究复杂条件下的CO吞吐机理。因此，采用大型物理模拟实验系统，首次选用露头平板模型，针对致密油首次利用致密岩芯和实际原油，开展分段压裂水平井CO吞吐模拟实验研究。实验结果表明，CO吞吐能有效提高致密油藏采收率，且注入压力是CO吞吐效果重要的影响因素；通过对吞吐过程中模型不同位置压力、出口产量等关键参数分析，明确了CO吞吐地层能量补充特征。研究成果对于致密油藏有效开发具有一定指导意义。

Using large physical simulation equipment and outcrop plate model, an experimental study on CO huff-n-puff in staged fracturing of horizontal wells was carried out. The experiment results show that CO huff-n-puff can effectively improve oil recovery of tight oil reservoir. In addition, the injection pressure is an important factor affecting CO huff-n-puff effect. By analyzing pressures at different model locations, production and other key parameters, we clearly define the stratigraphic energy supplement features of CO huff-n-puff. The result of the research has great significance in the effective development of tight oil reservoirs.

10.11885/j.issn.1674-5086.2015.11.23.03