METHOD FOR CONDUCTING INDUCTION GAMMA-NEUTRON LOGGING IN A WELL WITH HIGH FLUID LOSS AND RESTRICTIONS ON THE OPERATION OF A SMALL DIAMETER STRING Russian patent published in 2022 - IPC G01V5/14 E21B47/11 

FIELD: oil industry.

SUBSTANCE: invention relates to the oil industry and can be used in preparing a well and conducting a geophysical study of induction gamma-neutron logging (IGN) along the tubing string in conditions of high absorption of previously discovered development objects in small diameter wells, with the aim of additional exploration of the development object, determining oil-saturated thicknesses, calculation of hydrocarbon reserves in reservoirs. The substance of the invention lies in conducting geophysical surveys in the well and analyzing the results obtained. Preliminarily, during the current workover of the well, the liquid loss interval is determined, the assembly is lowered into the well on the tubing, including bottom-up: a plug, a packer, a perforated pipe that provides communication between the tubing and the annulus of the production string. The packer is set above absorbing formations, the pipe string and the annulus are filled with process fluid, checked for tightness, the downhole tool is lowered and induction gamma-neutron logging is performed on the well inside the cavity of the tubing. The downhole tool is lowered into the tubing to the bottom of the study interval. Recording of induction gamma-neutron logging begins simultaneously with the rise of the tool to the top of the studied interval at a speed of lifting the downhole tool not more than 120 m/h.

EFFECT: reducing the duration and cost of well repair, as well as expanding the arsenal of technological capabilities of the method for conducting induction gamma-neutron logging in a well with high fluid loss and restrictions on the operation of a small diameter string.

1 cl, 1 dwg