Accelerated downhole pressure testing

Details Accelerated downhole pressure testing Accelerated downhole pressure testing

E - Fixed Constructions

21

B

166/3

E21B 47/06 (2006.01) E21B 33/12 (2006.01) E21B 33/129 (2006.01) E21B 34/12 (2006.01) E21B 43/119 (2006.01) E21B 34/00 (2006.01)

Patent

CA 1194780

ACCELERATED DOWNHOLE PRESSURE TESTING ABSTRACT OF THE DISCLOSURE Apparatus for completing a hydrocarbon producing formation while concurrently measuring the tubing pressure which the perfo- rated formation may exert thereon. A casing gun is run downhole on the end of a tubing string. A packer is located above the gun, with a vent assembly being located between the gun and the packer. A valve means is located uphole and in close proximity of the packer and far downhole of the wellhead. The upper tubing string above the valve can be rotated respective to the lower string below the valve to close or open the valve means. The gun is fired, the formation is cleaned, and the valve is thereafter closed to deter- mine the shut-in pressure. A capillary tubing runs down the casing annulus to a location below the valve, where the capillary tubing is connected to the interior of the tubing string. The volume of the borehole measured from the wellhead to the valve means is much greater than the volume measured between the valve means and the gun. An on/off tool enables the string located immediately above the packer to be removed from the wellbore and a production string substituted therefor. -1-

395560

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