Initiation pressure models for supercritical CO2 fracturing and sensitivity analysis

CHEN Li-qiang; TIAN Shou-ceng; LI Gen-sheng; FAN Xin

doi:10.16285/j.rsm.2015.S2.016

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Initiation pressure models for supercritical CO2 fracturing and sensitivity analysis

更新时间：2026-06-25

- Initiation pressure models for supercritical CO2 fracturing and sensitivity analysis
- Vol. 36, Issue S2, Pages: 125-131(2015)
- 作者机构：
  
  中国石油大学（北京）油气资源与探测国家重点实验室,北京,102249
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2015.S2.016
  CLC： P618.13
- Online First：14 June 2018，
  
  Published：2015
- 稿件说明：
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CHEN Li-qiang, TIAN Shou-ceng, LI Gen-sheng, et al. Initiation pressure models for supercritical CO2 fracturing and sensitivity analysis[J]. 2015, 36(S2): 125-131.
DOI：

CHEN Li-qiang, TIAN Shou-ceng, LI Gen-sheng, et al. Initiation pressure models for supercritical CO2 fracturing and sensitivity analysis[J]. 2015, 36(S2): 125-131. DOI： 10.16285/j.rsm.2015.S2.016.

摘要

超临界CO2流体具有低黏度、无表面张力的特性，若应用于非常规油气储层压裂可望实现一种无污染的新型无水压裂方法。通过建立流体在井筒内的增压速率模型，得到了考虑超临界CO2流体黏度、压缩性及增压速率的裂缝起裂压力预测模型，并与水力压裂、液态CO2压裂起裂压力进行了对比分析。结果表明，超临界CO2流体的起裂压力比液态CO2流体低20.5 %，比常规水力压裂起裂压力低75.5%；超临界CO2流体的黏度、压缩性及增压速率对裂缝起裂压力影响显著。模型与文献中试验数据对比，误差在3%以内，可为超临界CO2压裂起裂压力预测提供指导。

Abstract

Considering the supercritical CO2’s characteristics of low viscosity and no surface tension

it is expected to be a new type of fracturing method for unconventional oil and gas reservoir. In this paper

we finally build the initiation pressure models for supercritical CO2 fracturing through the establishment of pressurization rate model of fluid in the wellbore

and compare with the breakdown pressure of water and liquid CO2. The results show that: the breakdown pressure of supercritical CO2 fluid is 20.5% less than liquid CO2 fluid

which is 75.5% less than conventional hydraulic fracturing breakdown pressure

which shows that breakdown pressure is significantly affected by the low viscosity and low pressurization rate of supercritical CO2. The error of this model is only less than 3% compared with experimental data in the literature

so as to indicate that the model can provide guidance for the prediction of supercritical CO2 fracturing initiation pressure.

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