Techniques to prolong flowing period of clastic rock gas condensate reservoir,Tahe Oil Field

Formation water coning may seriously affect gas well production capacity and gas reservoir re-covery rate.It causes the depletion of development efficiency and the early scrapping of wells,and alsoaffects the economy of field work,production and exploitation.Reservoirs in the Tahe Oil Field aremainly water-driving gas condensate ones with middle-high porosity and permeability.As to these res-eYVOIYS,edge-bottom water tonguing and coning are the key factors controlling recovery rate.At pres-ent,the water intrusion in gas pools is inevitable.It is necessary to reduce formation water coning andoutput so as to improve recovery rate.Treatments for water tonguing and coning are required.Studieshave been carried out from 2 aspects:a)controlling single well product and prolonging water-freeperiod;b)reducing critical fluid volume and prolonging flowing period.Some effective methods toprolong flowing period have been discussed.