Abstract

Supercritical carbon dioxide fracturing technology, as the main representative of water free fracturing technology, has unique advantages and broad application prospects in the development of shale oil and gas reservoirs. Supercritical carbon dioxide fracturing technology has low damage to the reservoir, no residue, and the fracturing fluid can flow back quickly, which is particularly suitable for the stimulation of shale oil reservoirs. It also injects carbon dioxide into the ground to reduce environmental pressure. However, as a new fracturing technology, the research on the fluid loss mechanism of supercritical carbon dioxide fracturing is not perfect. For this reason, based on the fluid solid coupling of porous media, this paper establishes the fluid loss model of supercritical carbon dioxide fracturing fluid in shale reservoir. The research results show that supercritical carbon dioxide fracturing fluid is greatly affected by temperature and pressure. The greater the viscosity of fracturing fluid during injection, the greater the resistance of fluid in the formation, and the slower the fluid loss rate. contributions of the work.

Introduction

With the progress of oil and gas field development technology, the development of low permeability and tight shale oil and gas resources has been paid more and more attention(Holditch, 2013). The decision-making power of the future energy market mainly depends on the resource potential and development degree of unconventional oil and gas. Nowadays, unconventional oil and gas resources development technologies and transformation measures represented by shale oil and gas are gradually maturing(Cui, 2019a , Cui, 2019b). Among these technologies, carbon dioxide fracturing technology has unique advantages in the stimulation and development of shale oil and gas reservoirs(Monjezi et al., 2020 , Rod et al., 2020 , Nianyin et al., 2021b , Nianyin et al., 2021a), including that the fracturing fluid does not contain water and has strong applicability to water sensitive formations(Liu et al., 2014).

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