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- Title
关井效应对酸压裂缝刻蚀形貌与导流能力影响.
- Authors
刘 超; 苟 波; 管晨呈; 郭建春; 李 骁; 王香增; 魏登峰; 郝世彦; 申 峰; 王念喜
- Abstract
In order to reveal the influence of acid retention time on acid-etching morphology and conductivity of acid-fractures during shut-in period, acid-etching and conductivity experiments were conducted, using a laboratory self-made device,, under different acid-injection time considering well shut-in effects. The rock samples used were from the outcrop rock samples of the Mawu-1 subsegment of the Ordovician Majiagou Formation in Yan̍an gas field (Ordos Basin), which were cut into rough slabs to simulate rough hydraulic fractures. The experimental results indicate that, for the Mawu-1 subsegment reservoir, there is an optimal acid-injection time of 60 minutes, in which the conductivity can reach to the maximum and optimum level. When the acid-injection time is less than the its optimal time, the shut-in effect can increase the tortuosity of the acid-etching fracture surface and the fracture-width, hence further enhancing the conductivity. When the acid-injection time is longer than the optimal acid-injection time, the shut-in effect will cause excessive dissolution of the acid-etching fracture surface, causing decrease of the tortuosity and average acid-etching fracture width and reducing the conductivity under high closure stress. The shut-in and flow back time should be determined according to the actual acid-injection time during acid fracturing, which can make full use of the shut-in effect on the acid-fracture conductivity, improving the response of acid-fracturing.
- Subjects
RF values (Chromatography); CARBONATE rocks; TORTUOSITY; ROCK deformation; RESERVOIRS; MORPHOLOGY; HYDRAULIC fracturing
- Publication
Journal of China University of Petroleum, 2021, Vol 45, Issue 2, p96
- ISSN
1673-5005
- Publication type
Article
- DOI
10.3969/j.issn.1673-5005.2021.02.011