Gas-Wetting Alteration by Fluorochemicals and Its Application for Enhancing Gas Recovery in Gas-Condensate Reservoirs: A Review

Energies

Kesheng Rong¹  Kaihe Lv²  Yingrui Bai²  Ren Wang²  Jingping Liu²  Xianbin Huang²  Jinsheng Sun²  Jintang Wang²  Jiafeng Jin²  TuanA. H. Nguyen³ 

[1] Engineering Technology Research Institute, Xinjiang Oilfield Company, CNPC, Karamay 841000, China;School of Petroleum Engineering, China University of Petroleum, Qingdao 266580, China;Sustainable Minerals Institute, Environment Centres (CMLR), University of Queensland, Brisbane, QLD 4072, Australia;

关键词: gas-wetting alteration;    liquid-blocking effect;    fluorochemical;    morphology;    flow behavior;   

DOI  :  10.3390/en13184591

来源: DOAJ

【 摘 要 】

Gas-wetting alteration is a versatile and effective approach for alleviating liquid-blockage that occurs when the wellbore pressure of a gas-condensate reservoir drops below the dew point. Fluorochemicals are of growing interest in gas-wetting alteration because of their high density of fluorine groups and thermal stability, which can change the reservoir wettability into more favorable conditions for liquids. This review aims to integrate the overlapping research between the current knowledge in organic chemistry and enhanced oil and gas recovery. The difference between wettability alteration and gas-wetting alteration is illustrated, and the methods used to evaluate gas-wetting are summarized. Recent advances in the applications of fluorochemicals for gas-wetting alteration are highlighted. The mechanisms of self-assembling adsorption layers formed by fluorochemicals with different surface morphologies are also reviewed. The factors that affect the gas-wetting performance of fluorochemicals are summarized. Meanwhile, the impacts of gas-wetting alteration on the migration of fluids in the pore throat are elaborated. Furthermore, the Wenzel and Cassie-Baxter theories are often used to describe the wettability model, but they are limited in reflecting the wetting regime of the gas-wetting surface; therefore, a wettability model for gas-wetting is discussed. Considering the promising prospects of gas-wetting alteration, this study is expected to provide insights into the relevance of gas-wetting, surface morphology and fluorochemicals, further exploring the mechanism of flow efficiency improvement of fluids in unconventional oil and gas reservoirs.

【 授权许可】

Unknown