APPLICATION OF TRIPLE PRODUCTION AND STRATIFICATION PRESSURE TESTING TECHNIQUES IN SEBEI GAS RESERVOIR

The Sebei loose sandstone gas reservoir has many layers characterized by thinness,interstratified gas and water,greatly different pressures of gas layers,and strong anisotropy.The reservoir is characterized by shallow embedment,great span,lack of compaction,poor diagenesis,and loosen bonding.It also has high content of clay,shale,salinity and sensitivity,and severe sand inflow etc.Gas wells only can produce by controlling differential pressure,three quarters of which can only produce under the restraint of 30 thousand and 50 thousand m3 per day.This restriction limits the gas well productivity to a large extent.Starting with the geologic characteristics of the Sebei gas field,this paper simulates and analyzes the variation of interlayer pressure and flow rate of two or three layers in commingled production,analyzes the effects of physical properties and parameters and the variation of pressure on the period of stabilized production and the yield of gas wells,then puts forward the techniques of triple production and stratification pressure testing to solve the contradiction.The field application shows that the techniques of triple production and stratification pressure testing have great effect and have a great potential for development.