大分子交联剂制备颗粒驱油剂及其性能

Preparation and Properties of Temperature-tolerant Viscoelastic Particle Oil-displacing Agent

曹绪龙

CAO Xulong

为了解决我国油田开采中出现的非均质性突出、高温高盐等问题，本文突破小分子交联剂制备颗粒驱油剂 的技术思路，采用合成的多种新型大分子交联剂制备了系列颗粒型驱油剂，并且对其网络结构、力学性能、耐老 化能力以及运移机理进行了研究。研究结果表明，大分子交联剂能够有效提高凝胶的均匀性，赋予了凝胶的优 异的力学性能。3 种大分子交联剂凝胶的断裂伸长率都在2000%以上，断裂强度达到0.3 MPa以上，并且90%压 缩应变下不破坏。其中MCH0.5-30 性能最优，断裂伸长率能够达到2800%，断裂强度能够达到0.6 MPa。此外其 在85℃、30 g/L 矿化度的盐水中，老化性能优于小分子交联剂制备的颗粒型驱油剂。大分子交联剂为制备高性 能凝胶颗粒驱油剂提供了新的思路，有望在高温高盐的苛刻油藏中得到应用。图26 参15

In order to solve the problems of heterogeneity，high temperature and high salt in the oilfield exploitation，the technical idea of preparing particle oil displacement agents with small molecule crosslinking agents was broken through，and a series of particles type oil-displacing agents were synthesized with a variety of new macromolecular crosslinkers，and the network structure， mechanical properties， aging resistance and migration mechanism was studied. The research results showed that the macromolecular crosslinking agent could effectively improve the uniformity of the gel and endow the gel with excellent mechanical properties. The breaking elongation of the three gels prepared with macromolecular crosslinking agent was above 2000%，the breaking strength was above 0.3 MPa，and could be compressed to 90% without being damaged. Among them，MCH0.5-30 had the best performance，the breaking elongation could reach up to 2800%，and the breaking strength could reach up to 0.6 MPa. In addition，it had a high modulus retention rate after aging in brine with a salinity of 30 g/L at 85℃ for 90 days，showing excellent aging resistance. Macromolecular crosslinking agents provide new ideas for the preparation of high-performance oil-displacing agent，which are expected to be applied in harsh oil reservoirs with high temperature and high salinity.