PRESSURE LEAKPROOFNESS TEST OF WELL COMPLETION UNIT INSTALLED IN ONE DESCENT AND LIFTING TRIP Russian patent published in 2022 - IPC E21B34/10 E21B34/16 E21B47/10 

FIELD: oil industry.

SUBSTANCE: invention relates to methods for well completion. A method is claimed for use when installing a well completion unit into a borehole in one descent and lifting trip into the borehole. The well completion unit defines a through channel and contains an isolation valve, which is configurable between an open state and a closed state for fluid through the through channel, and a flushing shoe. The isolation valve is located closer to the surface than the flushing shoe. To implement the method, the well completion unit with the isolation valve in the open state is lowered into the borehole until a borehole end of the well completion unit reaches the target location in the borehole. Fluid is pumped through the through channel and through the isolation valve, when the isolation valve is in the open state. The isolation valve is configured in the closed state. A pressure leak proofness test of the through channel is performed above the isolation valve. The isolation valve is configurable between open and closed states without any need for mechanical engagement of the isolation valve by an activating element or a device, while the isolation valve receives energy from an energy source.

EFFECT: increase in the quality and efficiency of well completion due to providing the possibility of flushing the completion unit to the final depth, conducting several leak proofness tests in one descent and lifting operation.

45 cl, 3 dwg