Analyses of Seepage Field Distribution and Pressure Stabilization Time for the Water Injection Test of Water Curtain Borehole in Underground Water-sealed Cavern
In recent years,the horizontal water curtain system has been widely adopted in the construction of underground water-sealed oil reservoirs in China,and the water curtain system is essential to ensure the water sealing of the oil reservoirs.The water curtain system often carries out a large number of hydraulic tests and accumulates a large amount of data.However,how to reasonably formulate test processes,effectively use test data,and reasonably evaluate the water seal effect,are the key issues that need to be studied further by combining engineering practice.This paper studies the issues of the theoretical background of the test,the rationality of the test process,and the data analysis based on the water injection-drop test of a single water curtain borehole in a water-sealed cavern reservoir.Firstly,the processes and characteristics of the water injection-drop test are analyzed.Then,based on the theoretical principle of the unsteady flow,the analytical equations of the water injection-drop test are deduced and further,the relationships among the water pressure of the water curtain borehole,the water injection volume,the test time,and the permeability of the surrounding rock are analyzed.Finally,via the theoretical analysis of the experimental data,the pressure stabilizing time of the water injection test is calculated and analyzed,and reasonable procedures for the water injection-drop test and requirements for pressure stabilizing time control are suggested.The research results can provide a theoretical reference for the establishment of the permeability test method for the water curtain system in underground water-sealed oil storage caverns.
underground water-sealed cavernwater curtain systemwater injection-drop testunsteady flowpressure stabilizing time
万方数据
维普
