Formulation Development And Performance Evaluation For Treatment Agent To Prevent Water Lock

In the drilling process of oil and gas fields,when drilling fluid and completion fluid,fracturing fluid from the fluid into the reservoir,due to capillary force retention,retention of liquid in the stratum under the action of pressure cannot be completely eliminated from the formation,cause of reservoir water saturation increasing,the permeability decreasing phenomenon called the water locking phenomenon,the development process of water locking phenomenon exists widely in the oil field.Low permeability oil and gas reservoirs are widely existed in China.In the process of development and utilization of these reservoirs,it is impossible to develop these reservoirs with high efficiency.Therefore,it is of great significance for the protection of oil and gas reservoirs to find an efficient water proofing agent which can restrain or relieve the damage of water lock.This paper studies the differences between different components in treatment agent to prevent water lock make filter for main agent and auxiliary agent,and by specific instrument to calculate interfacial tension,absorbance,demulsification rate,etc.respect for treatment agent,choose the best program.The experiments show that the treatment agent use 1.5 percent for main agent,0.2 percent alkyl sulfonate and 0.2 percent FX-02 for auxiliary agent,this system have the lowest interfacial tension,the demulsification rate is 90.4 percent,and in high salinity high temperature the system is stable,no new things produced,and have a good character to stick up temperature and salt.So this treatment agent is the best program in this experiment.