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Study and Application on Improving Hydraulic Fracture Complexity in Sandstone Reservoir

  

  1. 1.Faculty of Petroleum Engineering,China University of Petroleum,Beijing 102249,China; 2.Acidizing and Fracturing Center,Langfang Branch of Research Institute of Petroleum Exploration and Development,PetroChina,Langfang 065007,China; 3.Drilling and Production Institute of Qinhai Oilfield,Dunhuang 736200,China
  • Received:2013-08-01 Revised:2013-11-05 Online:2014-07-10 Published:2014-07-10

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Abstract:

Improving the fracture complexity is one of the most important parts to improve the stimulated reservoir volume.To understand when and how the complex fracture form in sandstone reservoir,a model is established to describe the natural fractured reservoir,the stress filed is analyzed by means of numerical simulation method and several treatment technical are brought forward based on the physical simulation experiment results.The analysis show that natural fractures,stress field inverting and elevating fracture pressure are the necessary condition to form complex fracture,and natural fractures are the most important ones.The bigger the principal stress bias and the orientation between hydraulic fracture and natural fracture are,the higher the fracture pressure is needed.Two and two more factures spread simultaneously could invert the stress field near the fracture.The monitoring and analysis show that the experimental wells form complex fractures by applying the technique.Therefore,the fracturing makes these oilfields with low permeability especially the tight sandstone oilfields be developed economically.

Key words: Sandstone reservoir, Complex fracture;Stress field, Natural fracture, Net pressure, Network fracturing

CLC Number: 

  • TE357.2

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