METHOD FOR PRESSURE TEST OF TUBING STRING Russian patent published in 2012 - IPC E21B47/00 E21B33/10 G01M3/28 

FIELD: oil and gas industry.

SUBSTANCE: method for pressure test of tubing string includes water pumping to tubing string and pressure measurement. Tubing string is equipped with packer installed above perforation interval, well injection capacity is determined and simultaneously integrity of production string is checked, packer is installed. In inter-tube space required pressure is built, liquid is pumped to tubing string in the volume of 3-9 m³ with flow 1.2-4 m³/min under pressure up to 50 MPa. Under increase of pressure in inter-tube space at speed up to 1.5 MPa/min up to pressure not exceeding 5 MPa, excess pressure is bled till pressure value is that of required one. Under decay of pressure in inter-tube space at speed up to 1.5 MPa/min, water is pumped to inter-tube space till pressure value is that of required one. If pressure increase is above 1.5 MPa/min and pressure is above 5 MPa, tubing string is considered untight. If pressure decay is above 1.5 MPa/min, production string is considered untight.

EFFECT: simplifying process of pressure test and reducing well off-period.