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辽河坳陷西部凹陷南部沙三段属于低孔特低渗致密砂岩油气藏,油气资源分布广泛开采难度大。现有的钻完井液体系不能满足安全快速钻井和储层保护的要求,进行了该项目的研究。室内对该区块致密砂岩储层进行了储层物性、敏感性及水锁等方面的评价,确定了钻井过程中存在的主要储层损害因素。通过室内试验优选优化了KCl钻完井液体系,并根据储层孔喉大小分布对该体系进行了广谱屏蔽暂堵技术改造。室内评价表明KCl钻完井液体系均具有良好的热稳定性。体系的润滑性和抑制防塌性好,抗污染能力强,可以满足探井的需要,渗透率恢复率均在82%以上,暂堵深度<1.1cm且易反排。可满足辽河坳陷西部凹陷南部沙三段致密砂岩储层保护的要求。
The third member of Shahejie Formation in the western part of western Liaohe Depression is a low-porosity and ultra-low permeability tight sandstone oil and gas reservoir with wide distribution of oil and gas resources. The existing drilling and completion fluid system can not meet the requirements of safe and rapid drilling and reservoir protection. The project was studied. The evaluation of reservoir physical property, sensitivity and water lock of the tight sandstone reservoir in this area was conducted indoors, and the main reservoir damage factors during drilling were determined. The KCl drilling and completion fluid system was optimized through laboratory experiments. Based on the pore throat size distribution of the reservoir, a broad-screen temporary blocking technology was modified. Indoor evaluation shows that KCl drilling and completion fluid system has good thermal stability. System lubrication and suppression of anti-slump, anti-pollution ability to meet the needs of exploration wells, permeability recovery rates were above 82%, temporary blocking depth <1.1cm and easy anti-row. It can meet the requirements of sandstone reservoir protection in the third member of Shahejie Formation in the western part of western sag of Liaohe Depression.