Special Oil & Gas Reservoirs >

2023 , Vol. 30 >Issue 4: 87 - 95

DOI: https://doi.org/10.3969/j.issn.1006-6535.2023.04.011

Reservoir Engineering

Establishment and Application of Pressure Drive Dynamic Fracture Model for Tight Oil Reservoirs

  • Cui Chuanzhi ,
  • Wang Junkang ,
  • Wu Zhongwei ,
  • Sui Yingfei ,
  • Li Jing ,
  • Lu Shuiqingshan
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  • 1. Key Laboratory of Unconventional Oil and Gas Development, Qingdao, Shandong 266580, China;
    2. China University of Petroleum (East China), Qingdao, Shandong 266580, China;
    3. Yangtze University, Wuhan, Hubei 434023, China

Received date: 2022-08-28

  Revised date: 2023-04-27

  Online published: 2023-09-18

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Abstract

To address the problem that conventional reservoir numerical simulation software cannot accurately simulate the fracture propagation during the development of pressure drive water injection of tight oil; based on the dynamic fracture propagation law during the development of pressure drive, the fracture propagation model is organically coupled with the oil-water two-phase seepage model of tight oil reservoir, a pressure drive water injection model was established, and the problem was solved by the finite difference method. The model was applied to the five-point injection and recovery well network of Well Cluster X8 in an oilfield to study the production dynamic characteristics of pressure drive development under high-speed constant displacement and step increasing displacement. The result shows that the injection displacement is positively correlated with the fracture propagation velocity; under the same injection displacement, the fracture propagation speed in the near-wellbore zone of the water injection well is faster; dynamic fracture made the pressure and injected water propagate along the fracture propagation direction; in a five-spot pattern well network with a cumulative injection volume of 3×104m3, compared with the step increasing displacement with high-speed constant displacement method, the fracture propagation length is increased by 11.9 m, and the oil-water front edge migration lags by 4.2 m; corresponding to corner wells, the effective time was 5 days later, the water breakthrough time was 31 days later, and the staged recovery degree was 0.45 percentage points higher; the step increasing displacement pressure drive method improved the affecting area of the injected water, delayed the water breakthrough time of the production well, and improved the development effects of the reservoir. The research results can provide technical support for pressure drive development water injection design of tight reservoirs.

Key words： tight reservoir; pressure drive; fracture propagation; numerical simulation

Cite this article

Cui Chuanzhi , Wang Junkang , Wu Zhongwei , Sui Yingfei , Li Jing , Lu Shuiqingshan . Establishment and Application of Pressure Drive Dynamic Fracture Model for Tight Oil Reservoirs[J]. Special Oil & Gas Reservoirs, 2023 , 30(4) : 87 -95 . DOI: 10.3969/j.issn.1006-6535.2023.04.011

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