OPTIMAL PRESSURE DRAWDOWN DETERMINATION METHOD Russian patent published in 2015 - IPC E21B43/12 E21B49/00 G01N29/14 

FIELD: oil and gas industry.

SUBSTANCE: method includes measurement of indicator diagram of well flow rate dependency on pressure drawdown and determination of the dependency peak corresponding to optimal pressure drawdown. Elastic strain dependency is measured, for example, propagation rate of elastic rate from porosity pressure in a core sample selected from the formation and placed into the hydraulic chamber with uniform pressure corresponding to conditions of natural occurrence, then porosity pressure is reduced smoothly up to the formation pressure with rate that does not exceed relaxation rate of limit strain in the core, which is used for assessment of acoustic emission non-availability, and then porosity pressure is continued to reduce as the core drawdown, and against commencement of sharp change in this dependency gradient reduction when plasticity limit is reached and acoustic emission occurs the limit value of optimal pressure drawdown is assessed.

EFFECT: improving accuracy in determination of optimal pressure drawdown.

1 dwg