Optimization of high-strength plugging agent and its application in deep-targeted plugging of high water-bearing reservoirs
The formulation optimization,temperature,salt resistance,plugging performance,flushing resistance and particle size matching of the dual-stimulated inorganic plugging agent were systematically studied for the high permeability,high condensation and extra high water-bearing sandstone reservoir in Henan oilfield.The results show that the retarder and ion-balancer are the dominant factors controlling the solidification time of the system,and the solidification rate of the dual-stimulated inorganic plugging agent increases with the increase of the concentration of the main agent and the stimulant as well as the temperature.When the mineralization of the liquid is higher,sulfate and chloride will accelerate the solidification time of the system.The double-stimulated inorganic plugging agent has strong plugging ability,good scouring resistance and deep fluid flow steering effect,which can effectively plug large pores in high permeability layer and improve the diversion rate of low permeability cores,and its plugging rate is higher than 98.5％.The field application effect confirms that the double-excited inorganic plugging agent can achieve deep targeting plugging.The advantages are high strength,long validity,and low cost,and the water content drops significantly after plugging.
medium and high permeability reservoirhigh water consumption zoneextra-high water cutinor-ganic plugging agentdeep targeted plugging
万方数据
维普
