METHOD FOR MONITORING TIGHTNESS OF INJECTION WELL (EMBODIMENTS) Russian patent published in 2019 - IPC E21B47/117 G01M3/28 

FIELD: oil, gas and coke-chemical industries.

SUBSTANCE: invention relates to oil and gas industry, namely to methods for evaluation of tightness of production string of injection wells equipped with tubing string and inter-tube packer. According to the first embodiment of the method, the pressure change is recorded in the inter-tube space covered by the packer, before and after the well shutdown, flow rate and temperature of the pumped liquid are measured during operation of the well, based on measurement data model thermograms are plotted in pumping and stopping mode, then a differential temperature curve is determined along the wellbore and its average value is used to obtain the average temperature drop across the wellbore, from which the pressure in the inter-tube space is calculated, proceeding from the dependence dP_calc=α/β*dT, and tightness of inter-tube space is evaluated. According to the second embodiment of the method, the pressure change is registered in the inter-tube space covered by the packer, before and after the well is stopped, the actual temperature is measured along the well shaft during operation and after the well is stopped, then a differential curve of temperature change is found along the well shaft and its average value is used to obtain the average temperature drop across the wellbore, by which the change in the pressure in the inter-tube space is calculated, based on the relationship dP_calc=α/β* dT, from which tightness of annular space is controlled.

EFFECT: technical result is simplification of method implementation.

2 cl, 3 dwg