DOWNHOLE ELECTROMAGNETIC TELEMETRY MONITORING DEVICE Russian patent published in 2022 - IPC E21B47/12 G01V3/18 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the oil and gas industry, in particular to the technical means of metrological control of downhole electromagnetic telemetry (EMT) systems. The device for monitoring downhole EMT is made in the form of a ground longitudinal structure that simulates the electrical resistivity (ER) of rocks using resistors. The resistors are located on several local linear sections of the structure, the nominal values of the resistors are the same within one linear local section and may be different on other linear local sections. Additionally, a drill string simulator or tubing simulator and k casing string simulators consisting of parallel electrical lines in the form of alternating links of series-connected resistors and inductors are introduced. A simulator of the specific electrical conductivity (SEC) of drilling mud between the drill and the first casing strings, made in the form of transversely oriented resistors connecting the links of the electric lines of the drill and first casing string simulators, has also been introduced. Cement stone SEC simulator in annular cavities between casing strings, made in the form of transversely oriented resistors connecting the links of the corresponding electrical lines of casing string simulators to each other. Imitation of the grounding resistances of casing strings in rocks is carried out by means of resistors simulating the ER of rocks in accordance with the geoelectric section, by including them between the links of the electrical lines of casing string simulators and the grounding bus. Additionally, q simulators of well sections containing layouts or EMT modules and made with the possibility of filling them with aqueous salt solutions with the required SEC are also introduced.

EFFECT: increasing the efficiency of EMT systems and providing the possibility of modeling wells of any depth, design and various geoelectric sections.

5 cl, 6 dwg