Prediction and precaution of cyclic gas injection problem in Dalaoba Gas Condensate Reservoir

The Dalaoba Gas Condensate Reservoir is a fully-equipped sandstone one. In the procedure of depleted exploitation, formation pressure drops quickly and edge water intrudes into gas well. Strata retrogrades condensation seriously and the gas/ oil ratio increases. The recovery rate of gas reservoir decreases. Gas is injected to maintain pressure so as to improve development efficiency and recovery rate. By surveying and studying the examples of gas breakthrough, conformance efficiency, ability of air intake and many other problems encountered in condensate gas reservoir exploitation home and abroad, combining with the characteristics of the Dalaoba Gas Condensate Reservoir, the problem may be faced in cyclic gas injection is summarized, and several proposals are raised to improve the efficiency of gas injection.