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吴起油田位于鄂尔多斯盆地伊陕斜坡,属注水开发的低渗透油田,主要开采层位于侏罗系延安组和三叠系延长组。在以往的常规取心中,岩心因受到钻井液的污染,导致地层孔隙率数据失真和地层液体矿物质成分发生变化并造成油水饱和度数据不准。为了解决这一难题,延长油田股份有限公司吴起采油厂2008年开始在吴起油田推广应用了MB215型密闭取心工具及工艺技术。2008-2009年在该油田共累计密闭取心12井次,共17筒。累计取心进尺148.96米,实际心长148.1米,收获率达99%,岩心密闭率95%,取得了良好的效果。
Wuqi Oilfield is located in the Yanshan Slope of the Ordos Basin, and is a low permeability oilfield developed by waterflooding. The main exploration layers are located in the Yan’an Formation of Jurassic and the Yanchang Formation of Triassic. In the conventional conventional coring, the cores were contaminated by the drilling fluid, which led to the distortion of the formation porosity data and the change of the composition of the liquid minerals in the formation and the inaccuracy of the oil-water saturation data. In order to solve this problem, Wuchang Oilfield of Yanchang Oilfield Co., Ltd. started to apply MB215 closed coring tool and technology in Wuqi Oilfield since 2008. A total of 12 closed coring wells were drilled in the field during 2008-2009, totaling 17 tubes. Cumulative total core footage of 148.96 meters, the actual heart length of 148.1 meters, the harvest rate of 99%, 95% of the core airtight, and achieved good results.