Yang Fan, Li Fan, Ji Renjing, Yu Xiaorong, Yang Huan, Su Gaoshen
State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing 102206, China.
Sinopec Research Institute of Petroleum Engineering Co., Ltd., Beijing 102206, China.
Gels. 2024 Sep 25;10(10):615. doi: 10.3390/gels10100615.
A self-degradable rubber plug (SDRP) was developed to address issues in existing crosslinked polymer temporary plugging technology, such as poor self-degradation properties. The synthesis formula was optimized using response surface analysis, resulting in an optimized composition of the SDRP: 13 wt% monomer, 0.02 wt% initiator, 0.7 wt% crosslinker, and 1.8 wt% degradation catalyst. Under the condition of 70-120 °C, the SDRP was transformed from a liquid to a solid gel in 30-110 min; the degradation time was 3-10 days, and the viscosity of the completely degraded solution was lower than 20 mPa·s. At an injection volume of 1 PV SDPR, a breakthrough pressure of 8.34 MPa was achieved. The hydrolysis of the unstable crosslinker was found to have caused the breakage of the SDRP. Over time, the functional groups within the unstable crosslinker underwent hydrolysis due to the combined effects of temperature and the degradation catalyst. This process led to the disruption of crosslinking points, resulting in a gradual deterioration of the network structure. As a consequence, some immobile water was converted into free water. The mobility of water molecules increased until the plug was completely degraded into a viscous liquid. This study enriches the temporary plugging gel system.
为解决现有交联聚合物暂堵技术中存在的诸如自降解性能差等问题，开发了一种自降解橡胶塞（SDRP）。利用响应面分析对合成配方进行了优化，得到了SDRP的优化组成：13 wt%单体、0.02 wt%引发剂、0.7 wt%交联剂和1.8 wt%降解催化剂。在70 - 120℃条件下，SDRP在30 - 110分钟内从液体转变为固体凝胶；降解时间为3 - 10天，完全降解溶液的粘度低于20 mPa·s。在注入1 PV SDPR的情况下，突破压力达到8.34 MPa。发现不稳定交联剂的水解导致了SDRP的破坏。随着时间的推移，由于温度和降解催化剂的共同作用，不稳定交联剂中的官能团发生水解。这个过程导致交联点的破坏，从而使网络结构逐渐恶化。结果，一些束缚水转化为自由水。水分子的流动性增加，直到堵塞物完全降解为粘性液体。本研究丰富了暂堵凝胶体系。
