Method to prevent gas intrusion into wellbores during setting of

Wells – Processes – With indicating – testing – measuring or locating

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166285, 166291, 166292, 175 50, 175 65, E21B 2108, E21B 3316, E21B 4706

Patent

active

050205943

ABSTRACT:
A method of cementing wells to minimize gas intrusion by applying pressures on the subsurface formations substantially equal to the natural formation pressures.

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