METHOD FOR DETERMINING CEMENT STONE VOIDS FILLED WITH MINERALIZED FLUID IN CASED WELLS OF OIL AND GAS CONDENSATE FIELDS Russian patent published in 2023 - IPC E21B47/10 

FIELD: well logging.

SUBSTANCE: invention relates to nuclear physics methods for studying cased oil and gas wells whose structural features of the geological section are characterized by the processes of brine manifestations and is intended to highlight intervals of cement stone voids filled with mineralized fluid (brine). The method provides an increase in the information content of well logging, carried out by a complex of nuclear physics methods and makes it possible to identify intervals of cement stone with voids filled with mineralized fluid (brine), taking into account the assessment of the boundaries of the location of brine-bearing and brine-absorbing intervals. The method provides for the study of wells at different stages of their construction and operation, which are characterized by different geological and technical conditions, the specificity of which, regarding brine manifestations, is taken into account when using a set of methods: gamma ray logging (GL), spectrometric gamma logging (SGL), neutron gamma ray logging (NGRL), neutron-neutron logging by thermal neutrons (2NNL-T), revealing the features of the structure of the geological section immediately after drilling; revealing the state of the layers, the presence of a brine in the voids of the cement stone after the casing of the wells and, in the future, during the operation of the wells. Comparison of the results of these measurements of GL, SGL, NGRL, 2NNL-T makes it possible to identify intervals of cement stone with voids filled with brine.

EFFECT: taking timely management decisions on the implementation of measures to prevent complications caused by brine manifestations.

1 cl, 1 dwg