未找到相关数据
Experimental NMR Analysis of Oil and Water Imbibition during Fracturing in Longmaxi Shale, SE Sichuan Basin
被引：12
作者：
Jiang, Yuqiang
[1
]
Fu, Yonghong
[1
]
Lei, Zhian
[2
]
Gu, Yifan
[1
]
Qi, Lin
[2
]
Cao, Zhibo
[3
]
机构：
[1] Southwest Petr Univ, Sch Geosci & Technol, Chengdu 610500, Sichuan, Peoples R China
[2] Chongqing Shale Gas Explorat & Dev Co Ltd, Chongqing 610213, Peoples R China
[3] PetroChina Xinjiang Oilfield Co, Baikouquan Oil Prod Factory, Karamay 834000, Peoples R China
基金：
中国国家自然科学基金;
关键词：
Longmaxi shale;
Spontaneous imbibition;
NMR;
Excessive imbibed water;
Isolated organic pore;
POROUS-MEDIA;
GAS;
WETTABILITY;
COCURRENT;
CONDUCTIVITY;
PERMEABILITY;
SURFACTANT;
DIFFUSION;
IMPACT;
DAMAGE;
D O I：
10.1627/jpi.62.1
中图分类号：
TE [石油、天然气工业];
TK [能源与动力工程];
学科分类号：
0807 ;
0820 ;
摘要：
The decrease in fracturing fluid flowback rate in the process of hydraulic fracturing and the improvement of initial gas production rate after well shut-in for a period of time were investigated using weight and nuclear magnetic resonance (NMR) T-2 spectra of dried shale cores and shale cores in the "as received" state after spontaneous oil and water imbibition. Experimental results indicated that the rate and weight during spontaneous water imbibition were much higher than those of spontaneous oil imbibition, contrary to capillary-driven imbibition models. Therefore, spontaneous water imbibition was related to both capillary pressure and additional hydration stress generated by clay swelling. NMR T-2 spectra of different imbibition fluids (oil and water) demonstrated that signals between 0.01 ms and 1 ms were total responses of pore fluids and irreducible water, and excess imbibed water was mainly present as irreducible water in shale. Excess imbibed water flowed into the matrix and reacted with minerals to generate many micro-fractures which may connect isolated organic pores to mitigate water blocking.
引用
收藏
页码：1 / 10
页数：10
相关论文