FIELD: oil and gas well testing. SUBSTANCE: initial formation pressure is determined by deep-seated pressure gage for the period of continuous oil or gas withdrawal. Maximum possible amount of oil or gas is withdrawn and current pressure is determined that corresponds to the amount of withdrawn oil or gas. Withdrawal coefficient is determined as the ratio of this amount to the difference between the initial and current formation pressure. EFFECT: high accuracy. 1 dwg, 1 tbl
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