Lithologic Reservoirs ›› 2018, Vol. 30 ›› Issue (1): 165-172.doi: 10.3969/j.issn.1673-8926.2018.01.017

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Fracturing technology for thin layer in tight sandstone reservoir and its application

LIU Jiankun1,2, JIANG Tingxue1,2, WAN Youyu3, WU Chunfang1,2, LIU Shihua1,2   

  1. 1. State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing 100101, China;
    2. Sinopec Research Institute of Petroleum Engineering, Beijing 100101, China;
    3. Research Institute of Drilling & Production Technology, PetroChina Qinghai Oilfield Company, Dunhuang 736202, Gansu, China
  • Received:2017-09-26 Revised:2017-11-28 Online:2018-01-21 Published:2018-01-21

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Abstract: In order to solve the fracturing problems in the thin layer of tight sandstone reservoir,such as difficulty of controlling fracture height,low stimulated reservoir volume, low proppant supporting efficiency,the maintaining of flow conductivity etc.,the difficulties of fracturing in such reservoir were analyzed by the means of simulating how different kinds of fracturing fluid under different fracturing construction parameters affect the fracturing parameters,and the main controlling factors were obtained. On this basis,a fracturing technological method for controlling fracture height and improving fracture supporting efficiency was formed. The result shows that the main factors affecting the expansion and extension of the fracture are the viscosity of fracturing fluid,followed by the construction displacement and the liquid quantity. The thin layer fracturing should be based on the controlling of fracture height,make full use of the natural fracture,and improve the construction volume and the supporting efficiency. Low viscosity fracturing fluid is suitable for thin layer volume fracturing for it can take into account the role of controlling fracture height and making long fracture length in thin layer fracturing,which is beneficial for opening and expanding natural fractures,and further reducing reservoir damage. The combination of multi-viscosity fracturing fluid system at different stages of pump construction can not only expand the effective fracture volume and form multi-scale fracture system,but also take into account the requirement for controlling fracture height in the front fluid stage and carrying proppant in the carrying stage. Variable density proppant combined with multi-scale proppant adding method can match different size proppant with different scale fracture system, and improve the supporting efficiency of multi-scale fracture system and fractures in far well zone. The research result was successfully used in many wells in Longfengshan thin layer gas reservoir and Jiangling thin layer oil reservoir. According to the testing result,the production was far better than that of conventional fracturing method and the stable production period was improved effectively. This method improved the effectiveness of thin layer fracturing.

Key words: fine-grained clastic rock, reservoir, Lucaogou Formation, unconventional resource, Junggar Basin

CLC Number: 

  • TE357.1
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