Volume 34 Issue 4
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DUAN Yongwei, ZHAN Jin. Mechanisms of CO2 Water-free Fracturing Method in Production Increasing[J]. DRILLING FLUID & COMPLETION FLUID, 2017, 34(4): 101-105. doi: 10.3969/j.issn.1001-5620.2017.04.019
Citation: DUAN Yongwei, ZHAN Jin. Mechanisms of CO2 Water-free Fracturing Method in Production Increasing[J]. DRILLING FLUID & COMPLETION FLUID, 2017, 34(4): 101-105. doi: 10.3969/j.issn.1001-5620.2017.04.019
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Mechanisms of CO2 Water-free Fracturing Method in Production Increasing

doi: 10.3969/j.issn.1001-5620.2017.04.019

  • 1. Research Institute of Oil and Gas Engineering, PetroChina Jilin Oil and Gas Field Company, Songyuan, Jilin 138001;

  • 2. School of Petroleum Engineering, China University of Petroleum, Beijing 102249

  • Received Date: 2016-07-05
  • Publish Date: 2017-07-31
    Abstract
  • Limited control range of a single well and insufficient formation energy supplement have long been critical problems affecting the development of tight oil reservoirs. Monitoring of downhole micro seism data during fracturing operation indicates that the volume of formation stimulated with CO2 water-free fracturing is 2.5 times of the volume of formation stimulated with conventional hydraulic fracturing using the same volume of water as that of the CO2 used, and the CO2 water-free fracturing creates fractures of increased complexity. Laboratory experiment and crude oil sampling after fracturing operation have proved that CO2 can effectively reduce the viscosity of crude oil. With the water-free fracturing, miscibility of crude oil is realized and oil displacement efficiency is enhanced. Static pressure test after fracturing shows that oil production after water-free fracturing is remarkably increased compared with the oil production before fracturing, an effect that is similar to advanced formation energy supplement of a well. CO2 water-free fracturing technology has been successfully used on 5 oil wells with tight reservoir, remarkably increasing oil production after fracturing. Average oil production increase of 2.31 t/d per well has been gained. The CO2 water-free fracturing also caused adjacent wells to produce more oil and more liquid, demonstrating that CO2 water-free fracturing, a prospective technology in tight oil reservoir development, is effective in well stimulation.

     

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