Measurement device for rock resistivity test and special-purpose electrode pad thereof

Abstract

The invention discloses a measurement device for a rock resistivity test and a special-purpose electrode pad thereof. An electrode pad is arranged between a holder and a rock core end surface. The electrode pad comprises a rubber pad and a circular pressing ring. One surface of the rubber pad is a spherical plump surface and the other surface is a flat surface. The spherical plump surface contacts with the rock core end surface. The flat surface is provided with the circular pressing ring. The circular pressing ring is provided with an external electrode. The rubber pad has a cavity and the cavity is filled with a liquid. The holder comprises a horizontal pushing rod. The horizontal pushing rod extrudes the electrode pad through an insulating separation plate. The horizontal pushing rod is installed on a base of the holder. A liquid is used as an elastic medium of the pad so that clamping forces on two end surfaces of the rock core are uniform and stable and it is avoided that rock core end surface sags and crests or poor flat treatment effects causes deficient contact between the rock core and the holder electrode so that resistivity test results are inaccurate.

Description

technical field

[0001] The invention relates to a laboratory measurement technique for rock resistivity parameters in petroleum development, in particular to a measuring device for rock resistivity testing and a special electrode gasket thereof. Background technique

[0002] In the indoor rock resistivity parameter measurement in the petroleum industry, there are many factors that affect the accuracy of the experimental test results. Among them, whether the core end face is in good and stable contact with the holder electrode has a great influence on the measurement results, so measures need to be taken to improve the contact status between the two. Cortical materials with a certain thickness and elasticity are usually used as electrode gaskets, but during use, it is found that for some rock cores whose end faces are difficult to grind flat, the resistivity test results caused by poor contact due to insufficient contact between the gasket and the core Deviation has a big im...

Images