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Investigation of Formation Damage Induced During Drill-In Process of Ultradeep Fractured Tight Sandstone Gas Reservoirs

机译:超级裂缝紧密砂岩气体储层钻探过程中形成损伤的调查

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摘要

Ultradeep fractured tight sandstone gas reservoir is easy to suffer from severe formation damage during the drill-in process, yet few papers have been published on the corresponding formation damage mechanisms. This paper focuses on a typical ultradeep fractured tight sandstone reservoir in the Tarim Basin, China. Fluid sensitivity damage, phase trapping damage, and the formation damage induced by oil-based drill-in fluids were evaluated by a serious of modified experimental methods. As a supplement, the rock physics and surface property were analyzed deeply. Results showed that severe fluid sensitivity damage occurred with a decrease in fluid salinity (critical value: 3/4 formation water salinity (FWS)) and an increase in fluid pH value (critical value: pH = 7.5). The change in water film thickness, the enhancement of hydrophilia, particle detachment, and dissolution of quartz/albite under high formation temperature are the main damage mechanisms. Abnormal low water saturation, mixed wettability, abundant clay minerals, and complex pore structures are contributing to the severe phase trapping damage. The dynamic damage rate of oil-based drill-in fluids is 60.01%, and inadequate loading capacity is the main trigger of lost circulation. Finally, a formation damage control strategy was proposed, and a field test proved its feasibility.
机译:UltraDeep破碎的紧密砂岩燃气藏容易在钻头过程中易受严重的形成损坏,但在相应的形成损伤机制上发表了很少的论文。本文侧重于中国塔里木盆地的典型超级碎砂岩水库。通过严重改良的实验方法评估了流体敏感性损伤,相捕损伤和由油基流体诱导的形成损伤。作为补充,深入分析岩石物理和表面特性。结果表明,液体盐度降低(临界值:3/4形成水盐度(FWS))和流体pH值(临界值:pH = 7.5)的增加,发生严重的液体敏感性损伤。水膜厚度的变化,高层水疗,颗粒脱离和高层间温度下的粒子脱离和溶解的溶解度是主要损伤机制。低水饱和度异常,混合润湿性,丰富的粘土矿物质和复杂的孔隙结构有助于严重的相位捕获损伤。油基钻孔流体的动态损伤率为60.01%,负载能力不足是丢失循环的主要触发。最后,提出了一种形成损伤控制策略,并证明了其可行性。

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