Determination method of well killing occasion of pressing-back method for gas well

摘要: The invention discloses a determination method of well killing occasion pressing-back for gas well. the comprises following steps collecting physical property parameters stratigraphic rock and fluid through geological logging data an adjoining well; drawing IPR (Inflow Performance Relationship) curve by formula collected data; OPR (Outflow relationship between pit shaft yield bottom hole pressure; in same coordinate system; calculating allowable maximum shut-in time; wellhead pressure function when is started at some moment after shut-in; solving judging latest time started. applicable to conditions that circulating cannot be carried out due blowout adopted carry killing; successfully killed using can calculated; therefore, risk generated process exceeds removed; theoretical guidance provided success killing. uncomplicated calculation process, simpler operation technique, suitable field use.