Lithologic Reservoirs ›› 2015, Vol. 27 ›› Issue (3): 11-17.doi: 10.3969/j.issn.1673-8926.2015.03.002

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Fracture spacing optimization for horizontal well alternating fracturing and influencing factors

YANG Zhaozhong1， SU Zhou 1，2， LI Xiaogang1， ZHANG Cheng3， XIE Zhongcheng4， DENG Ke5   

  1.  1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation ， Southwest Petroleum University ，Chengdu 610500 ， China ； 2. Research Institute of Oil and Gas Engineering ， PetroChina Tarim Oilfield Company ， Korla 841000 ， Xinjiang ， China ； 3. Tarim Engineering Company ， Chuanqing Drilling Engineering Company Limited ， CNPC ， Korla 841000 ， Xinjiang ， China ； 4. Engineering Technical Operation Center of CNOOC Shanghai Branch ， Shanghai 200030 ， China ； 5. Northeast Sichuan Gas Field ， PetroChina Southwest Oil and Gas Field Company ， Dazhou 635000 ， Sichuan ， China
  • Online:2015-05-26 Published:2015-05-26

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Abstract:

 For creation of large-scale effective complex fracture networks of unconventional oil/gas plays, fracture spacing for alternating fracturing should be optimized. Started from the effect of total induced stresses on initial horizontal stress anisotropy, the total induced stresses computational model of two adjacent hydraulic fractures with different fracture height and fracture net pressure was built. Subsequently, optimization approaches for critical fracture spacing of the first two hydraulic fractures and optimal fracture initiation position of the third one were proposed. The analysis result shows that critical fracture spacing between the first two hydraulic fractures decreased with the increase of Poisson’s ratio, and increased with the increase of fracture height and fracture net pressure; the optimal fracture initiation position of the third fracture apart from the first one decreased with the increase of Poisson’s ratio, and increased with the increase of fracture height. However, fracture net pressure has negligible impact on the optimal fracture initiation position of the third fracture. Finally, with comparison and analysis of a case study, the optimization results of the proposed approaches were proved to be much more advantageous and economic over the existed one, which is of significant guidance for creation of complex fracture networks with alternating fracturing technology in unconventional oil/gas reservoirs.

Key words:  alternating fracturing, complex volumetric fracture networks, stress shadow, principle of superposition, fracture spacing optimization

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