Optimization and performance evaluation of nano-composite high-efficiency gel system for offshore low-temperature reservoirs
At present,the offshore oilfield is affected by factors such as sedimentary envi-ronment,loose rock structure,and strong injection and strong production development mode.There are many deep channeling channels in reservoir.Concurrently,in the process of low-temperature reservoir improvement,the conventional gel profile control system has the prob-lems of difficult gel formation,low strength and poor plugging effect,which cannot meet the plugging requirements.Therefore,according to the characteristics of offshore low-tempera-ture reservoirs,Y-type polymers were screened as the main agent,and nano-type cross-junction promoters and initiator were added on the basis of cross-linking of water-soluble phenolic resin to obtain low-temperature reservoirs nano-composite high-efficiency gels system.The effects of water-soluble phenolic resin,nano-type cross-promotion and initiator concentration on the Y-1 gel system were determined by orthogonal experiments,and the performance of the nano-composite high-efficiency gel system was evaluated by SEM,salt tolerance experiment and core plugging ratio experiment.The research results indicate that the characteristics of controllable gelatinization time,adjustable gelatinization strength and strong aging stability.Under low-temperature conditions,the Y-1 gel system exhibited a particle-packing microstructure,which had the characteristics of high strength and good stability of the skeleton structure,and the core experiment found that the plugging effect was good.
NETL
NSTL
万方数据
维普
