摘要
针对崖城气田钻井过程中出现的油气层损害等复杂情况，在综合分析研究气田预探井储层岩心资料的基础上，采用X射线衍射、滴定分析、PVT测试等方法，详细描述了储层构造特征、温度压力特征、孔渗特征、流体特征及黏土矿物特征，同时通过速敏、水敏、酸敏、碱敏、应力敏等敏感性试验，系统评价了储层潜在损害因素类型和敏感性程度。试验结果表明：储层临界流速为0．5mL／min，为弱速敏；最低临界矿化度为9485．7mg／L，具有中等程度的水敏损害；储层岩心对盐酸表现出中等偏弱酸敏，土酸则呈现为无敏感性；临界pH值为9，储层为弱碱敏；储层存在弱的应力敏感，临界压力在9～11MPa。
Aiming at the complex cases of formation damage occurred during drilling process in Yacheng gas field, and based on the comprehensive analysis of reservoir core data of preliminary prospecting well, the reservoir structure characteristics, temperature and pressure characteristics, porosity and permeability characteristics, fluid characteristics, and clay mineral characteristics are described in details by means of X-Ray diffraction, titration analysis and PVT testing. The potential reservoir damage factors and degree of sensitivity are systematically evaluated through a series of sensitivity tests including velocity, water, acid, alkali, and stress sensitivity. The results show that the reservoir behaves weak velocity sensitivity with critical flow rate of 0. 5 mL/min. The lowest critical salinity is 9 485.7 mg/L, which indicates moderate degree of water sensitivity damage. The reservoir core behaves middle weak acid-sensitivity to hydroehloride and non-sensitivity to acid soil. The reservoir displays weak base-sensitivity with critical pH value of 9 and weak stress- sensitivity with critical pressure of 9 to 11 MPa.
出处
《能源化工》
2016年第6期78-82,共5页
Energy Chemical Industry
关键词
敏感性
储层特征
水敏
气田
损害因素
sensitivity
reservoir characteristics
water sensitivity
gas field
damage factors
