Recovery of Low Permeability Reservoirs Considering Well Shut-Ins and Surfactant Additivities

Shuai Li, Jun Tang, Yunhong Ding, Shimin Liu, Guangfeng Liu and Bo Cai
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Shuai Li: Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China
Jun Tang: School of Geosciences, Yangtze University, Wuhan 430100, China
Yunhong Ding: Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China
Shimin Liu: Department of Energy and Mineral Engineering, G3 Center and Energy Institute, Pennsylvania State University, University Park, PA 16802, USA
Guangfeng Liu: Education Ministry Key Laboratory of Petroleum Engineering, China University of Petroleum, Beijing 102249, China
Bo Cai: Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China

Energies, 2017, vol. 10, issue 9, 1-14

Abstract: To investigate the mechanism whereby well shut-ins and surfactant additivities can increase hydrocarbon output after hydraulic fracturing, in this paper, we simulated well shut-ins with one end open (OEO) rock samples and performed a serious of imbibition experiments with different surfactant additivities based on contact angle (CA) and interfacial tension (IFT) measurements. Scanning electron microscope (SEM) and nuclear magnetic resonance (NMR) methods were also been adopted in the detection before and after shut-ins. The results demonstrated that cationic surfactants result in better improving oil recovery (IOR) performance due to their high wettability alteration ability on vertical fracture faces, while different kinds of surfactants have a similar ability in lowering IFT. As for shut-ins duration, the NMR transverse relaxation time ( T 2 ) spectrum move towards the left side, indicating that aqueous phases migrate to smaller pores spaces and deeper distances. Aqueous migration during the shut-ins period can remove near-fracture trapped water, while surfactant additivities can accelerate and enhance this process, and these two points are the most direct reasons for the observed hydrocarbon output increases.

Keywords: low permeability reservoir; hydraulic fracturing; well shut-ins; surfactant additivities; imbibition; wettability alteration (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2017
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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