大庆油田聚驱后剩余油挖潜技术探讨

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大庆油田1996年聚合物驱投入工业化应用,目前已投入78个区块,动用地质储量9.72亿吨,进入后续水驱阶段的区块30个,总动用地质储量4.46亿吨,同时每年新增聚驱后区块储量500万吨;目前大庆油田注聚结束区块基本都转入后续水驱,综合含水已高达96.8%,平均采出程度53.2%,并且基本上属于一类油层。聚驱后仍有近50%的地质储量残留地下,而且是优质储量,说明聚驱后有进一步挖潜的潜力。本文通过分析聚驱后剩余油分布情况,在精细地质研究的基础上,加强油藏工程与采油工程的结合,根据剩余油分布特征,及聚驱后地层综合含水高的特点,采取压堵结合、选择性压裂等相应的压裂技术进行挖潜,现场试验取得了好的效果,并提出利用水平井挖潜剩余油,如超短半径水平井、水力喷射等技术进行定点定位挖潜改造,为大庆油田聚驱后这部分剩余油挖潜提供一些思路和方法。 In 1996, polymer flooding was put into industrial application in Daqing Oilfield. At present, 78 blocks have been put into use, with a geological reserve of 972 million tons and 30 blocks of subsequent water flooding stages with a total utilization of 446 million tons of geological reserves. Meanwhile, new poly At the end of Daqing Oilfield, the blocks at the end of flooding and injection are basically transferred to subsequent water flooding. The integrated water content has reached 96.8% with an average recovery of 53.2% and basically belongs to a class of oil reservoirs. After the flooding, nearly 50% of the remaining geological reserves remain underground, and are high-quality reserves, indicating the potential for further potential tapping after the flooding. Based on the analysis of the remaining oil distribution after the polymer flooding, based on the fine geological study, the combination of reservoir engineering and oil recovery engineering is strengthened. According to the characteristics of remaining oil distribution and the high comprehensive water content after formation, , Selective fracturing and other fracturing techniques to tap the potential of the field test has achieved good results, and put forward the use of horizontal wells tapping potential residual oil, such as ultra-short radius horizontal wells, hydraulic injection technology to carry out fixed-point positioning to tap the potential for Daqing This part of the residual oil field tapping oil tapping potential to provide some ideas and methods.
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