METHOD OF EFFICIENT DRAWDOWN AND BUILDUP TESTING OF A COMPLETED PRODUCING WELL

摘要

A method of efficient drawdown and buildup testing of a completed producing well, the well having therein a production tubing string through which well fluids are produced from a subsurface formation intersected by the well. The method comprises providing in the production tubing string an automatically controlled shut-in tool for controlling flow of well fluid up through the production tubing string; shutting in the well by closing the shut-in tool; monitoring a downhole parameter; sensing when the downhole parameter has achieved a criteria; generating a command signal in response to the sensing step; and automatically opening the shut-in tool in response to the command signal.