中深层稠油油藏化学辅助蒸汽驱三维物理模拟与应用  

Three-dimensional physical simulation and application of chemistry assistant steam flooding on middle and deep heavy oil reservoir

作　　者：曹嫣镔[1,2] 刘冬青[2] 王善堂[2] 于田田[2] 张仲平[2] 

机构地区：[1]中国石油大学化学工程学院,山东青岛266580 [2]中国石油化工股份有限公司胜利油田分公司采油工艺研究院,山东东营257000

出　　处：《石油学报》2014年第4期739-744,共6页Acta Petrolei Sinica

基　　金：国家重大科技专项(2011ZX05011-002)资助

摘　　要：胜利油田稠油油藏由于埋深和边底水的影响,油藏压力无法降低到5 MPa以下再进行蒸汽驱,一般转驱压力为7 MPa。为进一步提高蒸汽驱的实施效果,利用室内实验研究了化学辅助驱方式进一步提高采收率。以胜利油田孤岛油田Ng5层位直井反九点井网为原型开展物理模拟研究。通过对比单纯蒸汽驱、化学辅助蒸汽驱等不同方式提高采收率的幅度,对泡沫剂、驱油剂不同注入方式进行对比分析,并确定现场实施方式。室内实验研究结果表明:采用"先调后驱"的化学辅助蒸汽驱方式,可以在蒸汽驱的基础上进一步提高采收率;高温驱油剂的主要作用是提高蒸汽前沿热水带洗油效率,高温泡沫的主要作用是调整蒸汽剖面,增加波及体积,提高热利用率。现场实际应用表明,化学辅助蒸汽驱是高压稠油油藏转蒸汽驱可行的开发方式。In Shengli oilfield, steam flooding is impossible to start under the pressure of 5 MPa and the displacement pressure is generally 7 MPa owing to the deep burial depth of heavy oil reservoirs and the impact of edge-bottom water. To further improve the performance of steam flooding, laboratory tests are carried out to increase the reservoir recovery using chemically-assisted flooding approach. A physical simulation study is performed by taking an inverted nine-spot pattern of vertical wells in the Ng5 layer of Gudao district, Shengli oilfield. The magnitude of enhanced oil recovery by simple and chemically-assisted steam flooding is compared for assessing different injection methods with foaming and displacing agents, further to determine the method for site implementation. Laboratory experimental data show that chemically-assisted flooding in the ＂first adjusting and then flooding＂ model can further improve oil recovery on the basis of steam flooding. High-temperature displacing agent mainly plays a role in improving the oil-washing efficiency of hot water at the steam frontier, whereas high-temperature foam mainly adjusts the steam profile, increases the swept volume, and improves the thermal efficiency. Field application demonstrates that chemically-assisted steam flooding is a feasible method for the development of high-pressure heavy oil reservoirs.

关 键 词：稠油油藏 化学辅助蒸汽驱 汽窜 泡沫 驱油剂 三维物理模拟 

分 类 号：TE357[石油与天然气工程—油气田开发工程]