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1978年河南油田进入注水开发期,为掌握油藏水淹规律、油藏水驱效果、油层物性变化、剩余油分布以及落实油藏最终采收率,进行了多口井的密闭取心。但由于大部分密闭取心井密闭率低,没有取得理想的效果。检7井是使用河南石油勘探局勘探开发研究所研制的HY-92密闭液钻的第一口密闭取心井。密闭取心要求钻井液API滤失量小于2.3 mL,密闭率达到70％。在诸多影响密闭率的因素中,地层岩性、含水饱和度是不可控的客观因素,机械钻速也只能在有限的范围内提高,因此影响密闭率的主要可控因素是钻井液滤失量及密闭液的性能。
Henan Oilfield entered the waterflood development period in 1978. In order to grasp the law of reservoir flooding, the reservoir waterflooding effect, the change of reservoir physical properties, the distribution of remaining oil and the implementation of the final oil recovery, multi-well closed coring was conducted. However, due to the low confinement rate of most closed coring wells, the desired effect has not been achieved. Check 7 wells is the use of Henan Petroleum Exploration Bureau Exploration and Development Institute developed HY-92 sealed liquid drilling first closed-hole coring wells. Closed coring requirements drilling fluid API filtration loss of less than 2.3 mL, airtight rate of 70%. Among many factors that affect the confinement rate, formation lithology and water saturation are uncontrollable objective factors, and ROP can only increase within a limited range. Therefore, the main controllable factor affecting confinement rate is fluid loss Volume and the performance of the sealing solution.