油基钻井液对超深裂缝性致密砂岩气藏的保护能力评价

发布时间：2018-03-08 02:06

本文选题：超深　切入点：裂缝性　出处：《天然气工业》2017年02期 　论文类型：期刊论文

【摘要】：以塔里木盆地山前白垩系巴什基奇克组某超深、裂缝性致密砂岩气藏为研究对象,探究油基钻井液对其储层的损害机理,以便于完善油基钻井液储层保护能力评价方法和优选原则。为此开展了钻井液滤液损害、钻井液体系动态损害以及滤饼承压能力室内实验,完善了该钻井液储层保护能力的室内评价方法。首先进行固相粒度分析前进行钻井液预处理,然后模拟动态损害过程评价钻井液返排渗透率恢复率,最后开展滤饼承压能力评价。实验结果表明:1主要的储层损害方式为固相侵入、液相圈闭损害;2油基钻井液滤液对基块损害程度为强;3钻井液体系对裂缝动态损害程度达到中等偏强—强,钻井液滤饼仅对100μm及以下缝宽裂缝具有封堵能力。结论认为,应用油基钻井液保护该类储层应优先保证油基钻井液滤饼承压能力,同时兼顾动态损害渗透率恢复率和液相圈闭损害程度。
[Abstract]:Taking an ultra-deep fractured tight sandstone gas reservoir in the Cretaceous of the Cretaceous in Tarim Basin as the research object, the damage mechanism of oil-base drilling fluid to its reservoir is explored. In order to improve the evaluation method and optimal selection principle of oil-base drilling fluid reservoir protection ability, the laboratory experiments of drilling fluid filtrate damage, drilling fluid system dynamic damage and filter cake bearing capacity were carried out. The laboratory evaluation method for the reservoir protection ability of the drilling fluid is improved. Firstly, the drilling fluid pretreatment is carried out before the solid particle size analysis, and then the recovery rate of the drilling fluid backflow permeability is evaluated by simulating the dynamic damage process. Finally, the pressure bearing capacity of filter cake was evaluated. The experimental results show that the main reservoir damage mode of 1: 1 is solid phase invasion. The damage degree of liquid phase trap damage oil based drilling fluid filtrate to base block is strong, the dynamic damage degree of drilling fluid system to fracture is medium strong and strong, the filter cake of drilling fluid only has plugging ability to 100 渭 m and below fracture width fracture, the conclusion is that, the damage degree of drilling fluid system to base block is strong and strong, and the filter cake of drilling fluid has plugging ability to fracture of 100 渭 m and below. The oil base drilling fluid should be used to protect this kind of reservoir first to ensure the pressure bearing ability of oil base drilling fluid filter cake, and at the same time, the recovery rate of dynamic damage permeability and the damage degree of liquid phase trap should be taken into account.
【作者单位】：中国石油塔里木油田公司;"油气藏地质及开发工程"国家重点实验室·西南石油大学;
【基金】：国家自然科学基金项目“富有机质页岩氧化致裂增渗加速气体传输机理研究”(编号:51674209)、国家自然科学基金项目“基于逾渗和固液两相流理论的裂缝性储层工作液漏失损害预测与控制”(编号:51604236)
【分类号】：TE254

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