Development of Novel Star-Like Branched-Chain Acrylamide (AM)-Sodium Styrene Sulfonate (SSS) Copolymers for Heavy Oil Emulsion Viscosity Reduction and Its Potential Application in Enhanced Oil Recovery

被引：0

作者：

Zhao, Chunhua ^{[1
]}

Zhang, Jian ^{[1
]}

Lv, Jianrong ^{[2
]}

Huang, Bo ^{[1
]}

Yang, Guang ^{[1
]}

Tang, Engao ^{[1
]}

Chen, Minggui ^{[3
,4
]}

Xu, Chenyu ^{[3
]}

Ge, Yizhuo ^{[3
]}

机构：

[1] CNOOC, State Key Lab Offshore Oil Exploitat, Beijing 100028, Peoples R China

[2] Petro China, Xinjiang Oilfield Co, Res Inst Explorat & Dev, Karamay 834000, Peoples R China

[3] Yangtze Univ, Sch Petr Engn, Key Lab Petr Drilling & Prod, Wuhan 430100, Peoples R China

[4] Oil & Gas Field Appl Chem Key Lab Sichuan Prov, Chengdu 610500, Peoples R China

来源：

ACS OMEGA | 2023年 / 9卷 / 01期

基金：

美国国家科学基金会;

关键词：

RAFT POLYMERIZATION;

D O I：

10.1021/acsomega.3c05875

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Injecting water with chemicals to generate emulsions in the reservoir is a promising method for enhancing heavy oil recovery because oil-in-water (O/W) emulsions significantly reduce oil viscosity. To enhance heavy oil recovery efficiency, we developed new star-like branched AM-SSS copolymers (SB-PAMs) with reduction in the viscosity of the heavy oil emulsion, which was synthesized by reversible addition-fragmentation chain transfer (RAFT) controlled radical polymerization. The core structure of the branched polymer was RAFT polymerization of acrylamide (AM) and N,N '-methylene bis-acrylamide (BisAM), in the presence of 3-(((benzylthio)carbonothioyl)thio)propanoic acid as a chain transfer agent, followed by chain extension with AM and SSS. The core structures were achieved by incorporation of total monomer ratios [BisAM]/[AM] of 1:11. The expansion of the core structures by copolymerization of AM and SSS resulted in star-like branched polymer SB-PAM-co-SSS with apparent molecular weights ranging from 240 to 2381 kDa. H-1-nuclear magnetic resonance (H-1 NMR) and Fourier transform infrared (FTIR) confirmed the synthesized polymer structure. The molecular weight was determined by gel permeation chromatography (GPC). The polydispersity coefficient was between 1 and 7, which has a broad molecular weight distribution. The polymer dissolves only 0.75 h in deionized water, faster than conventional polyacrylamide. At 50 degrees C, the viscosity of the 1000 mg/L SB-polymer solution can reach up to 45 mPa<middle dot>s. First, heavy oil viscosity reduction by 800 mg/L SB polymer can reach 91.7%, at a water dehydration rate of 90.4%; second, with 0.6 PV injection, 800 mg/L SB polymer improved oil recovery up to 23.66% after water flooding; and third, SB-polymer-assisted hot water flooding shows that heavy oil recovery improved by 19.46% at 110 degrees C with 0.6 pore volume (PV) SB-polymer injection. This novel branched chain polymer with heavy oil emulsion capability will shed light on high-temperature polymer flooding and the development of a new candidate structure for heavy oil viscosity reduction.

引用

页码：422 / 436

页数：15