Abstract: Apparatus comprising a valve housing adapted to be supported on a tubular member having a bore therein and a passage in the tubular member and the valve housing for communicating fluid from the interior of the tubular member to an inflatable element supported externally on the tubular member to inflate it. Disposed in the bore is a valve for controlling fluid flow from the interior of the tubular member through the bore to the inflatable element. The valve is restrained from moving responsive to a pressure differential between a higher pressure in an annulus surrounding the tubular member and a lower pressure in the bore, and the apparatus releases the valve for movement responsive to a lower pressure differential from a higher pressure from the interior of the tubular member and a lower pressure in the annulus for further movement to a further configuration responsive to a pressure differential between a higher pressure in the annulus and a lower pressure from the interior of the tubular member.

Abstract: A valve housing is adapted to be supported on a tubular member, there being bore means in the valve housing. Passage means are provided in the tubular member and in the valve housing for communicating fluid from the interior of the tubular member through the bore means to the interior of an inflatable element carried by the tubular member for inflation of the inflatable element. First valve means in the bore means control fluid flow into the bore means, and second valve means in the bore means control fluid flow from the bore means to the inflatable element. Means retain the second valve means in position in the bore means to close off flow to the inflatable element until a first predetermined pressure is reached in the bore means and for releasing the second valve means so that it may move to communicate the bore means for flow to the interior of the inflatable element when the first predetermined pressure is reached.

Abstract: A testing or treating tool enables either squeeze packer elements or inflatable packer elements to isolate an interval of the well bore. A pump provides hydraulic pressure to move the packer elements into sealing engagement with the well bore wall by manipulation of a tubular member which supports the tool in the well bore. The tool includes a sensor which is responsive to a pressure differential between the hydrostatic pressure in the well bore and the pressure in the isolated zone, or interval, in the well to increase the hydraulic pressure acting on the elements when the pressure in the well bore exceeds the pressure in the isolated zone to inhibit creep of the packers along the well bore wall. A collection reservoir receives fluid displaced from the well bore as the packers sealably engage the well bore.