| 摘要 |
A method of treating an underground formation that has been penetrated by a well, the well having a wellbore. The method comprising the steps of lowerin g a valve into the well until the valve is adjacent the formation with the val ve being placed to control flow of fluid between the formation and the wellbore , establishing a pressure differential across the valve; and selectively and repeatedly opening and closing the valve to cause cyclical pressure variatio n in the formation and induce surges of fluid from the formation into the wellbore. Apparatus for carrying out the method is also disclosed. A method of operating a downhole valve is also disclosed. A method of formation evaluati on is also disclosed.
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