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Damage evaluation on oil-based drill-in fluids for ultra-deep fractured tight sandstone gas reservoirs

机译：超深裂缝致密砂岩气藏油基钻井液的损害评价

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摘要

In order to explore the damage mechanisms and improve the method to evaluate and optimize the performance of formation damage control of oil-based drill-in fluids, this paper took an ultra-deep fractured tight gas reservoir in piedmont configuration, located in the Cretaceous Bashijiqike Fm of the Tarim Basin, as an example. First, evaluation experiments were conducted on the filtrate invasion, the dynamic damage of oil-based drill-in fluids and the loading capacity of filter cakes. Meanwhile, the evaluating methods were optimized for the formation damage control effect of oil-based drill-in fluids in laboratory: pre-processing drill-in fluids before grading analysis; using the dynamic damage method to simulate the damage process for evaluating the percentage of regained permeability; and evaluating the loading capacity of filter cakes. The experimental results show that (1) oil phase trapping damage and solid phase invasion are the main formation damage types; (2) the damage degree of filtrate is the strongest on the matrix; and (3) the dynamic damage degree of oil-based drill-in fluids reaches medium strong to strong on fractures and filter cakes show a good sealing capacity for the fractures less than 100?μm. In conclusion, the filter cakes' loading capacity should be first guaranteed, and both percentage of regained permeability and liquid trapping damage degree should be both considered in the oil-based drill-in fluids prepared for those ultra-deep fractured tight sandstone gas reservoirs.
机译：为了探索损害机理并改进评价和优化油基钻井液地层损害控制性能的方法，本文采用了位于白垩纪巴什吉奇克山前山构造的超深裂缝致密气藏。以塔里木盆地的Fm为例。首先，对滤液的侵入，油基钻井液的动态破坏和滤饼的负载能力进行了评估实验。同时，针对实验室油基钻井液的地层破坏控制效果，对评价方法进行了优化。使用动态损伤方法模拟损伤过程，以评估重新获得的渗透率百分比;并评估滤饼的负载能力。实验结果表明：（1）油相捕集破坏和固相侵入是主要的地层破坏类型; （2）滤液对基质的破坏程度最强; （3）裂缝性油基钻井液的动态破坏程度达到中到强，滤饼对小于100？μm的裂缝表现出良好的密封能力。总之，在为那些超深裂缝致密砂岩气藏制备的油基钻井液中，应首先确保滤饼的负载能力，并同时考虑重新获得的渗透率百分比和捕集液损害程度。

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