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Enhanced recovery of tight reservoirs after fracturing by natural gas huff-n-puff: Underlying mechanisms and influential factors

引用

Petroleum Science 2023年第6期20卷 3498-3515页

作者： Chuan-Jin Yao Ya-Qian Liu Bai-Shuo Liu Zheng-Dong Lei Jia Zhao Lei Li national Key Laboratory of Deep Oil and gas China University of Petroleum(East China)Qingdao 266580ShandongChina Key Laboratory of Unconventional Oil&gas Development(China University of Petroleum(East China)) Ministry of EducationQingdao266580ShandongChina School of Petroleum Engineering China University of Petroleum(East China)Qingdao266580ShandongChina Research Institute of Petroleum Exploration&Development PetroChinaBeijing100083China

Tight oil resources are abundant in the *** is very important to strengthen the research on the development theory and technology of tight oil reservoirs for ensuring national energy *** gas huff-n-puff can effectively improve the oil recovery of tight oil ***,the pore-scale oil production characteristics and the mechanisms of natural gas huff-n-puff in matrix-fracture cores are poorly *** influence degree of important factors on oil recovery is not clear and the interactions between factors are rarely *** this paper,the oil production characteristics and mechanisms of natural gas huff-n-puff in tight cores with different fracture lengths were quantitatively analyzed by combining nuclear magnetic resonance(nMR)with numerical simulation *** influencing factors and their interactions were evaluated by the response surface method(RSM).The results show that tight cores mainly consist of medium pores(0.1–1μm)and small pores(0.01–0.1μm).The fracture mainly increases the proportion of macro-pores(1–10μm)and medium *** the natural gas huff-n-puff process,crude oil from macro-pores(1–10μm)and medium pores is mainly developed,and the contribution percentage of crude oil in medium pores to oil recovery is the largest,up to 98.28%.The position of gas–oil contact(GOC)moves deeper as the number of huff-n-puff cycles *** contents of CH_(4) and CO_(2) in the oil phase remain at a high level within the GOC,while between the GOC and the component sweep front,the contents of CH_(4) and CO_(2) in the oil phase decrease with the increase in dimensionless *** gas component sweep volume is increasing with the increase in fracture ***,the injected natural gas mainly extracts C_(3)–C_(10) components from crude *** reduction law of crude oil viscosity is consistent with the migration laws of CH_(4) components along the *** with soaking time and gas diffusion coefficient,the inje

关键词： natural gas huff-n-puff Matrix-fracture cores nuclear magnetic resonance(nMR) numerical simulation Response surface method(RSM)

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