MEASUREMENT PROCEDURE AT LATERAL LOGGING OF WELLS Russian patent published in 2010 - IPC G01V3/20 

FIELD: oil and gas production.

SUBSTANCE: alternate feed current is supplied to electrically connected central and shield electrodes of arrangement. Current I₀ of the central electrode and potential ΔU of screen electrodes are measured relative to a reference electrode. During logging there are also measured specific resistance ρ_c of drilling fluid and temperature t° in the well. There is determined resistance of r_0t circuit connecting central and shield electrodes at temperature t° out of ratio: r_0t=r₀(1+α·Δt°), where r₀ is resistance of the circuit preliminary measured at 20°C; Δt=t°-20°; and α is a temperature coefficient of resistance. Further, there is calculated ratio and is determined apparent resistivity ρ_k of rock from preliminary calculated dependencies for a row of values of specific resistance of a formation, of resistance r₀ and nominal diametre of the well.

EFFECT: upgraded accuracy of measurements and reliability of their execution, automatic record of well influence.

1 dwg