METHOD OF DETERMINATION OF FLUID-MOVEMENT PROFILE AND PARAMETERS OF NEAR-WELLBORE Russian patent published in 2012 - IPC E21B47/103 

FIELD: oil and gas industry.

SUBSTANCE: after long-term operation of well with constant production rate, well production rate is changed and pressure in bottom hole in well is measured before and after change of production rate. Well fluid temperature is measured near upper boundary of the lowest productive formation and below and above other productive formations. Diagram of dependence on temperature time measured above the lowest formation is constructed as well as diagram of dependence of derivative of this temperature by time logarithm on time. According to diagram of dependence of derivative of temperature by time logarithm on time, moment of time when derivative of temperature reaches constant value is determined, and according to diagram of dependence on temperature time measured above the lowest formation, change of temperature of well fluid to this moment of time is determined; based on the values obtained skin factor of the lowest formation is calculated. Using iteration procedure concerning temperatures measured below and above other productive formations, relative production rates and temperature of fluids moving to well from above formations are determined in succession, skin factors of above formations are calculated.

EFFECT: improving accuracy of well parameters determination.

2 cl, 5 dwg