Gelation Behavior Study of a Resorcinol–Hexamethyleneteramine Crosslinked Polymer Gel for Water Shut-Off Treatment in Low Temperature and High Salinity Reservoirs

Yongpeng Sun, Yanchao Fang, Ang Chen, Qing You, Caili Dai, Rui Cheng and Yifei Liu
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Yongpeng Sun: School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China
Yanchao Fang: School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China
Ang Chen: School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China
Qing You: School of Energy Resources, China University of Geosciences, Beijing 100083, China
Caili Dai: School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China
Rui Cheng: School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China
Yifei Liu: School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China

Energies, 2017, vol. 10, issue 7, 1-13

Abstract: Mature oilfields usually encounter the problem of high watercut. It is practical to use chemical methods for water-shutoff in production wells, however conventional water-shutoff agents have problems of long gelation time, low gel strength, and poor stability under low temperature and high salinity conditions. In this work a novel polymer gel for low temperature and high salinity reservoirs was developed. This water-shutoff agent had controllable gelation time, adjustable gel strength and good stability performance. The crosslinking process of this polymer gel was studied by rheological experiments. The process could be divided into an induction period, a fast crosslinking period, and a stable period. Its gelation behaviors were investigated in detail. According to the Gel Strength Code (GSC) and vacuum breakthrough method, the gel strength was displayed in contour maps. The composition of the polymer gel was optimized to 0.25~0.3% YG100 + 0.6~0.9% resorcinol + 0.2~0.4% hexamethylenetetramine (HMTA) + 0.08~0.27% conditioner (oxalic acid). With the concentration increase of the polymer gel and temperature, the decrease of pH, the induction period became shorter and the crosslinking was more efficient, resulting in better stability performance. Various factors of the gelation behavior which have an impact on the crosslinking reaction process were examined. The relationships between each impact factor and the initial crosslinking time were described with mathematical equations.

Keywords: resorcinol–HMTA polymer gel; gelation behavior; water-shutoff agent; low-temperature and high-salinity reservoir; crosslinking process (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
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