PI决策技术在中原油田的应用

中原油田是一个复杂断块砂岩油气田 ,储集层埋藏深 ,渗透率低 ,非均质严重。进入高含水开发期以来 ,高渗透层段 (或条带 )水淹严重 ,而中、低渗透层吸水很差或根本不吸水 ,剩余油比较富集。这部分油单靠强注强采、加密井网以及其它常规工艺措施很难采出来 ,而三次采油成本很高 ,且注入水波及系数也难以有大的提高。对PI决策技术在油藏整体调剖堵水方面的进一步研究证明 ,通过PI决策整体调剖 ,能有效地封堵高渗透层或条带 ,使油藏在平面和纵向上压力指数值基本接近 ,力求达到储集层在平面和纵向上均质化 ,改善中、低渗透层 (或条带 )的吸水状况 ,提高注入水波及体积和注入水利用率 ,遏制油田含水上升速度 ,提高水驱采收率 ,延长油田稳产期。对中原油田 1 3个区块的PI决策整体调剖分析和评价 ,证明无论是在油藏吸水状况、产能及含水变化态势、水驱采收率变化 ,还是在经济效益等方面 ,都有较大的改善 ,油田开发水平明显提高。图 2表 3参 3 (王元胜摘 )

Application of PI decision making technology in Zhongyuan oil field.

Zhongyuan oil field is a complex fault block sandstone reservoir, which has deep oil reservoir rock, low permeability and serious heterogeneity. Since entering into the high water cut stage, interval (or zone) of high permeability has been watered out seriously, but of middle or low permeability took little water or nothing, where there is considerable remaining oil. This part of oil is hard to be produced only with enhanced injection and production or with infill well pattern or with other conventional technique. It is expensive to produce this part of oil with tertiary oil recovery methods and is hard to increase the sweep efficiency of the injected water. Through the research on application of PI decision making technology in full reservoir profile control and water blockoff, which includes the research on feasibility of using PI decision making technology in oil field, on mechanism of whole profile control decision making technology, on decision making methods and processes and on the key problems to be solved, the PI decision making whole profile control technology has been proved effective to plug high permeability interval or zone, to make horizontal PI value and vertical PI value alike, to make the reservoir homogeneous in horizontal and vertical direction, to improve the water taking of interval or zone with middle and low permeability, to increase injection water swept volume and efficiency, to descend oil field water cut increasing rate, to increase water drive recovery efficiency and to prolong oil field stable production time. With the analysis and evaluation of PI decision making whole profile control in 13 blocks of the oil field, it has been improved highly in reservoir water injectivity, production and water cut situation, water drive recovery efficiency change and in economy benefit. The production level of oil field is improved obviously.