塔河油田缝洞型碳酸盐岩油藏合理注采井网优化研究

OPTIMIZATION RESEARCH ON REASONABLE INJECTION- PRODUCTION PATTERN IN TAHE OILFIELD FRACTURED CARBONATE RESERVOIR

塔河油田缝洞型碳酸盐岩油藏是由多期次构造及古岩溶作用形成的大规模缝洞系统构成的强非均质性油藏。通过对前期注水试验,结合不同储集体中油水流动的机理分析,总结出了塔河油田缝洞型碳酸盐岩油藏合理注采井网的优化部署问题,包括井间连通性的确定、注采井组的储集体类型、注采井组所处高低部位以及流体分布模式等。缝洞型油藏应根据井、注采井组在不同储集体上部署时,应选择缝洞系统低部位的井作为注水井,高部位的井作为采油井,充分利用油水重力差的作用来提高注水开发效果。

Tahe Oilfield fractured carbonate reservoir belongs to strong heterogeneity reservoirs. Through the early water injection test,and combined with the mechanism analysis of oil and water flow in different reservoir,the optimizing problems of reasonable injection- production well pattern deployment were summarized in Tahe Oilfield fractured carbonate reservoir,including the choice of the connectivity between wells,reservoir types of injection- production well group,position of injection- production well group and fluid distribution model. The deployment of fractured injection- production well group in different reservoir should choose low position well as injection wells,high position wells as production wells,the water flooding development effect was improved by using oil- water gravity difference function.