The Effective Development Way And Its Economic Limitation For H Marine Low Permeability Tight Gas Reservoir

Compact gas reservoir is the reservoir has a poor reservoir property,and in order to make the exploitation of the reservoir more effectively we need to adopt appropriate measures such as fracturing and special well.Compact gas reservoir has a large difference of pore throat structure,original movable water,and pressure sensitive after pressure drop when exploit.And a great many of compact gas reservoirs are on the verge of economic benefits or even have no development value,which make them cannot be exploited effectively,due to the characteristics of low porosity,low productivity,and low permeability.Especially when it refers to marine low permeability tight gas reservoir,it needs to find a way to developing effectively and economically.Difficulties for the exploitation of marine low permeability tight gas reservoir are as follows:?.small scale of reserves,scattered distribution,and increasing difficulties for exploitation;?.poor reservoir property,complex connectivity,and thin alternating layers;?.high pore throat ratio,water-locking;?.high mobile water saturation,production of water in gas reservoir;?.high cost for exploitation,high capacity requirements for single well.According to the above problem,took low permeability tight gas reservoir H as an example,not only demonstrated its optimum development mode,but also carried out the research of development limitation for compact gas reservoir based on the current economic and technological conditions.This paper provided reliable basis for the choice of ways to exploit compact gas reservoir,and furthermore offered important reference and ideas for the economic and effective exploitation of low permeability gas reservoir.This paper mainly obtained the following achievement:1)Summed up basic geological characteristics of low permeability tight gas reservoir H,analyzed the seepage flow characteristics,determined the start-up pressure gradient,abandonment pressure and theoretical capacity,etc.2)Studied the effective way of exploitation for low permeability gas reservoir H by utilizing gas reservoir engineering theory and numerical simulation method,and put forward the choice of ways to exploit compact gas reservoir under different geological situation.3)For low permeability gas reservoir H exist interlayer,numerical method was used to study the effect of different interlayer types on gas reservoir capacity,and based on this,obtained conclusion that when fracturing a horizontal well,we should ensure fracture number first,and then followed by fracture half-length.4)According to the exploitation characteristics of compact gas field,established the economic evaluation methods for low permeability tight gas reservoir,and taking economic development as the constraint condition,researched the economic development limitation chart for compact gas field under different development mode.