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Impact Factors on fracturing Results of Coal Seams and Appropriate Countermeasures

Journal of Energy and Power Engineering 2010年第6期4卷 16-26页

作者： X. Wang Y.H. Ding Y. Xu Y.Y. Duan fracturing ＆ acidizing technical service center Research Institute of Petroleum Exploration and Development China NationalPetroleum Corp. Langfang 065007 China

Hydraulic fracturing is one of the efficient means for the abundant low-permeability CBM （coal-bed methane） reserves in China, however, due to the unique features of coal seams （i.e., low temperature, strong adsorption and abnormal development of natural fracture systems） as compared with the conventional reservoirs, the fractures propagate is difficult and the risk of damage to coal seam itself and the hydraulic fractures would be extremely high in the course of fracturing. As a result, losses would be suffered on the post-frac production of CBM *** the mean of numerical simulation, in this paper, the main factors have impact on the post-frac results as well as the extent to which the impact is brought were researched, and the technical solutions for the improvement of the fracturing performance was put forwards.

关键词： Coal-seam fracturing hazard factors yield loss rate technical solutions.

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Numerical simulation of fracture propagation in Russia carbonate reservoirs during refracturing

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Petroleum Science 2022年第6期19卷 2781-2795页

作者： Dao-Bing Wang Fu-Jian Zhou Yi-Peng Li Bo Yu Dmitriy Martyushev Xiong-Fei Liu Meng Wang Chun-Ming He Dong-Xu Han Dong-Liang Sun School of Mechanical Engineering Beijing Institute of Petrochemical TechnologyBeijing102617China Unconventional Oil and Gas Science and Technology Research Institute China University of Petroleum-BeijingBeijing102249China Tuha Downhole service Company of Xibu Drilling Engineering Company Limited China National Petroleum Corporation(CNPC)Hami839009XinjiangChina Department of Oil and Gas Technologies Perm National Research Polytechnic UniversityPerm614990Russia Fracture&acidizing technical center Research Institute of Petroleum Exploration and DevelopmentPetro ChinaBeijing100083China

Refracturing treatment is often performed on Russian carbonate reservoirs because of the quick production decline of *** traditional refracturing model assumes that a refracture initiates in the normal direction relative to the initial *** assumption is inconsistent with oilfield measurements of refracture propagation ***,the existing model is not based on an indepth understanding of initiation and propagation mechanisms of the second hydraulic fractures during *** this study,we use the extended finite element method to investigate refracture propagation paths at different initiation *** the enriched function approach and phantom mode technique are incorporated into the refracturing model,thereby ensuring that the refracture can freely extend on the structured mesh without any refinement near the crack *** factors including production time,stress anisotropy and initiation angle,and the propped mechanical effect are analyzed in *** study provides new insight into the mechanism of refracture propagation in unconventional reservoirs.

关键词： Refracturing Stress reorientation Extended finite element method Carbonate reservoir Fracture diversion

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