The Role of Microemulsion and Shut-in on Well Performance: From Field Scale to Laboratory Scale

Day 1 Tue, February 05, 2019 Pub Date : 2019-01-29 DOI:10.2118/194363-MS

Taregh Soleiman Asl, A. Habibi, Obinna Ezulike, Maryam Eghbalvala, H. Dehghanpour

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引用次数: 10

Abstract

We analyzed flowback and post-flowback production data from a horizontal well in the Montney Formation, which was fractured with water containing a microemulsion additive. This well was shut-in for 7 months after 5 months of post-flowback production. Oil and gas rates were significantly increased after the shut-in (700% increase), suggesting a reduction in matrix-fracture damage. We performed imbibition oil-recovery tests to evaluate the imbibition of the ME solution into the oil-saturated core plugs. The results show that the microemulsion solution can spontaneously imbibe into the oil-saturated core plugs leading to the final oil recovery factor of 24% of the original oil in place, compared with the tap water case with only 2% oil recovery factor. Combined analyses of the field and laboratory results suggest that imbibition of the fracturing water containing the ME solution during the extended shut-in period leads to 1) reduction of water blockage near the fracture face and 2) counter-current production of oil. These two effects can explain the enhanced production rate of oil and gas after the shut-in period.

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微乳液和关井对油井性能的影响:从现场规模到实验室规模

我们分析了Montney组的一口水平井的反排和反排后生产数据，该水平井使用含有微乳液添加剂的水进行压裂。经过5个月的返排生产后，该井关井7个月。关井后，油气产量显著增加(增加700%)，表明基质裂缝损伤减少。我们进行了渗吸采油测试，以评估ME溶液对饱和油岩心桥塞的渗吸作用。结果表明，微乳状液可以自发地吸收到含油饱和的岩心桥塞中，最终采收率为原始油的24%，而自来水的采收率仅为2%。现场和实验室结果的综合分析表明，在延长关井期间，含有ME溶液的压裂水的渗吸作用导致1)裂缝面附近的水堵塞减少，2)石油逆流生产。这两种效应可以解释关井后油气产量的提高。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Day 1 Tue, February 05, 2019

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