Development And Performance Evaluation Of Temporary Plugging Agent For Deformed Particles In Tight Reservoirs

Aiming at the characteristics of tight reservoirs with poor physical properties and strong heterogeneity,etc.In order to increase the drainage area,the temporary plugging steering technology is used to improve the fractured well pattern.However,current temporary plugging agents have problems such as a small breakthrough pressure gradient,large fracturing fluid filtration loss,and poor degradation performance.Based on the self-developed temporary particle blocking agent system,this paper evaluates the performance of this temporary particle blocking agents.We used the test method to investigate the expansion factor and degradation performance of different formulations of temporary plugging agents under different conditions.We combined the test method and viscosity test to investigate the expansion of the temporary plugging agents with different particle sizes,formulas,mineralization,p H,and temperature.Finally,the core displacement experiments were used to investigate the breakthrough pressure gradient and reservoir damage of the deformed particle temporary plugging agent under different conditions by changing the injection pressure,expansion factor,and degree of mineralization Based on the self-developed temporary particle blocking agent system developed by the laboratory.By changing the particle size and monomer ratio of the temporary blocking agent,it is preferable to have a large expansion factor and good degradation performance under different mineralization,pressure,and particle size combinations.The experimental results show that when the concentration of the crosslinking agent is low and the monomer ratio is 3:7,the swelling performance and degradation performance are both optimal.As the temperature increases,the expansion factor of the temporary plugging agent increases,and the degradation time decreases,and it still performs well at a high temperature of 150 ?.The salinity has little effect on the system,which shows that it has good compatibility with strata with different salinity.It is found through displacement experiments that the pressure resistance of the temporary plugging agent is up to 133 MPa / m(core scale)and it has a high breakthrough pressure gradient,and is deformable.Compared with before degradation and after complete degradation,the core permeability does not change much.