Patent ID: 7896077
Filing Date: 2011-03-01
Classification: E21B

Abstract:
1. A method for use in a well, comprising: creating a transient overbalance condition in a wellbore interval such that a pressure of the wellbore interval is greater than a reservoir pressure in a surrounding formation, wherein creating the transient overbalance condition comprises using a first device uphole of the wellbore interval and a second device downhole of the wellbore interval, wherein activation of each of the first and second devices causes the respective one of the first and second devices to generate a pressure pulse that travels to the wellbore interval, where the pressure pulses of the first and second devices combine to create the transient overbalance condition, wherein creating the transient overbalance condition causes a near-wellbore region of the formation to increase in pressure; and after creating the transient overbalance condition, reducing the pressure in the wellbore interval at a rate that produces a relative underbalance condition in which the pressure in the wellbore interval is less than the pressure of the near-wellbore region of the formation.