Lithologic Reservoirs ›› 2020, Vol. 32 ›› Issue (2): 169-176.doi: 10.12108/yxyqc.20200219

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Extending regularity of fracture height by acid fracturing in carbonate reservoir: a case study of Qixia Formation in western Sichuan

LUO Zhifeng1,2, HUANG Jingyun1,2, HE Tianshu1,2, HAN Mingzhe1,2, ZHANG Jintao3   

  1. 1. School of Petroleum Engineering, Southwest Petroleum University, Chengdu 610500, China;
    2. State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China;
    3. PetroChina Southwest Oilfield Company, Chengdu 610051, China
  • Received:2019-12-18 Revised:2020-03-04 Published:2020-04-29

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Abstract: Acid fracturing is a very effective means of increasing production for the development of deep marine carbonates in western Sichuan. Currently, there exists many problems in the development of deep marine carbonates in western Sichuan such as strong heterogeneity, thin reservoirs, and small differences of reservoir stress. Technically, the main problem in transformation is the control of fracture height. Therefore, the influence of engineering geological factors on fracture height was studied with the geological conditions of the X gas well in western Sichuan into consideration by means of finite element numerical simulation. Moreover, this simulated model was verified by the results of the fracture height obtained by net pressure fitting on FracPT software, microearthquake data and data of production well temperature. For last analysis, the results of this paper show that the viscosity of the working fluid, the construction displacement and the injection scale, and the difference increase in inter-stress of the reservoir barrier are good for controlling the fracture height. The result well guides the parameter optimization of the X gas well construction. After the construction, the daily gas production of the X gas well test is 104, 500 m3. This paper plays a guiding role in the optimal design of acid fracturing and on-site construction in deep marine carbonate rocks in western Sichuan.

Key words: carbonate reservoir, acid fracturing, fracture height, ABAQUS, finite element method, three dimensional numerical simulation

CLC Number: 

  • TE323
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