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- Title
深层页岩气水平井压裂异步起裂 裂缝延伸模拟与调控.
- Authors
宋 毅; 林 然; 黄浩勇; 任 岚; 岳文翰; 孙 映
- Abstract
Intensive cluster fracturing in horizontal well is widely applied in deep shale gas reservoirs to stimulation production, but rapid deep in-situ stress variation and inter-fracture stress interference result in difference of hydraulic fracture length and urgently need adjust and control. Considering different initiation time and uneven propagation of hydraulic fractures during deep shale gas fracturing, asynchronous initiation-propagation model for hydraulic fractures is established, and meanwhile considering influences of in-situ stress variation and inter-fracture stress interference on asynchronous initiation and non-uniform propagation of hydraulic fractures. The simulation results show that, by means of conventional uniform perforation technology, The higher the formation breakdown pressure in perforation cluster location is, the later of fracture initiation time of this cluster is. the faster the outer fractures propagate, the more serious the fracture propagation uniformity is. With the help of non-uniform limited entry perforation technique and by means of rationally adjusting perforation number of each cluster, difference between initiation time and propagation velocity of each fracture can be significantly reduced to ensure the length of each fracture basically same, thus the targets of“restraining long fractures, advancing short fractures and improving fractures uniform propagation”can be realized.The fluid inflow proportion of each cluster monitored on-site is consistent with calculated results of the model, verifying model reliability. The research results can effectively reduce parameter design blindness of non-uniform limited entry perforation technique, and have important theoretical value and guiding effect on optimization design of deep shale gas fracturing.
- Publication
Petroleum Geology & Oilfield Development in Daqing, 2022, Vol 41, Issue 5, p145
- ISSN
1000-3754
- Publication type
Article
- DOI
10.19597/J.ISSN.1000-3754.202105063