Conductivity of acid etched fractures with high closure stress
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摘要: 针对高闭合应力地层如何提高裂缝导流能力，分别研究了酸液-岩石接触时间、酸液类型、闭合应力对导流能力的影响，以及通过复合方式提高导流能力的措施。结果表明：同样酸岩接触时间下，半对数坐标中导流能力与闭合应力近似呈直线。高闭合应力下，导流能力较低；在低闭合应力下，大粒径支撑剂酸蚀裂缝导流能力较高。高闭合压力下，推荐40/70目陶粒。铺砂浓度越高，导流能力越高，酸蚀加砂是提高导流能力的措施之一。Abstract: The article aims at a question that how to improve fracture conductivity with high closure stress. It researches the influences of contact time between acid and rock, types of acid, closure stress on conductivity respectively and how to improve conductivity by compound manner. It turned out that flow conductivity has a linear relationship with closure stress on semilog coordinate in same contract time between acid and rock, which means higher closure stress, lower flow conductivity. The experimental results also show that acid etching fracture has higher flow conducti-vity with big propping agent in low closure stress. It's more appropriate to choose propping agent from 40 to 70 mesh in high closure stress stratum, and the larger the sanding concentration, the higher the flow conductivity. Therefore, sanding in the acid etching stratum is one of the most effective means for improving flow conductivity.
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Key words:
- carbonate rock /
- acid etched fracture /
- flow conductivity /
- high closure stress
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