Lithologic Reservoirs ›› 2018, Vol. 30 ›› Issue (4): 140-148.doi: 10.12108/yxyqc.20180417

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Volume fracturing parameters optimization of horizontal well in tight reservoir

SU Hao1,2, LEI Zhengdong2, ZHANG Diqiu3, LI Junchao2, JU Binshan1, ZHANG Zeren4   

  1. 1. School of Energy Resources, China University of Geosciences, Beijing 100083, China;
    2. PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China;
    3. PetroChina Research Institute of Economics & Technology, Beijing 100724, China;
    4. Bureau of Geophysical Prospecting, PetroChina, Zhuozhou 072750, China
  • Received:2017-12-20 Revised:2018-03-04 Online:2018-07-21 Published:2018-07-21

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Abstract: The technique combining horizontal well with volume fracturing is an important way to obtain commercial oil flow in tight reservoir. In order to optimize the volume fracturing parameters of horizontal well which influence its development effects,based on the numerical simulation method of discrete fracture model,the more flexible unstructured grid was used to establish simulation models of volume fracturing for horizontal well, which can explicitly characterize the geometric parameters of complex fractures and the flows inside,verified by the Eclipse software and the actual mine well data. By referring to the parameters of tight reservoir in Changqing Oilfield,the parameters of the horizontal well such as orientation,fracture arrangement,stage spacing,cluster spacing and SRV were optimized. The results show that the development effect is best when the orientation of horizontal well is parallel to the orientation of natural fractures. The optimal sorting of fracture arrangement type is dumbbell-type,staggered-type,uniform-type and spindle-type. The stage spacing should be longer than sum of drainage radius of both two adjacent stages,so as to eliminate the interference among the stages. The cluster spacing should be as long as possible without excess the average length of natural fractures. When SRV is constant,the longer the length of stimulated areas,the better the development effect will be. When the length of the stimulated fracture is difficult to increase restricted by technology,increasing the number of cluster could improve the well productivity as well,and the more clusters there are,the highest of initial cumulative production can be expected,nevertheless,the optimal cluster number depends on well planned production time. The research results can provide a basis for the design of fractured horizontal wells in tight reservoirs.

Key words: radial well fracturing, steam soak, deliverability, fracture morphology

CLC Number: 

  • TE319
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