New Material of Composite Chemical Proppant Backflow Prevention

After fracturing, too fast discharge speed of oil and gas well “sand production” will lead to the deterioration of artificial fracture support condition and the decrease of conductivity, which will affect the production of oil and gas, or lead to the accumulation of sand at the bottom of the well and the burial of oil and gas layer or the erosion of sand production to puncture the surface test pipeline, which will affect the smooth progress of testing and oil and gas exploitation. In domestic oil fields such as Daqing, Shengli, Jilin, Dagang, Sichuan and so on, sand buried reservoir caused by proppant reflux has also occurred, resulting in reduced oil production or no oil production. At present, the solutions to the problem of “sand production” at home and abroad are self-consolidation proppant reflux technology, fiber backflow prevention technology, thermoplastic film backflow prevention technology and deformable proppant backflow prevention technology, etc. The field test effect still has technical shortcomings. In this study, the epoxy resin emulsion anti-reflux additive is combined with degradable fiber to form a composite chemical anti-reflux material, and the optimal ratio of composite chemical anti-reflux material is optimized. The synergistic effect of chemical cementation and physical entanglements is played to improve the compressive strength of consolidated sand column, which is conducive to reducing the proppant backflow. A high efficiency epoxy emulsion - degradable fiber compound anti-reflux additive was prepared. In addition, the material preparation process does not require a large amount of organic solvents, in line with the concept of environmental protection, to improve the current technical level and production capacity of the field has a significant contribution to reduce the damage to the formation.