Rock wettability measuring device and method in formation water environment

Abstract

The invention discloses a rock wettability measuring device and a method in formation water environment, and relates to the field of oil and gas development research, the device comprises a cubic containing body with an upward opening and a transparent side wall; stratum water contained in the containing body; a rock core slice which is arranged in the stratum water and extends along the horizontal direction; a bracket which is used for supporting the rock core slice; a first needle tube, and a trace gas sample injector which is connected with the first needle tube and is used for injecting trace gas, wherein the outlet end of the first needle tube can extend in the vertical direction; a second needle tube, and a water injector which is connected with the second needle tube, wherein the outlet end of the second needle tube can extend in the horizontal direction; and a contact angle measuring instrument which comprises a high-definition camera and a high-definition imager. The inventionbelongs to the field of gas environment, and the gas-water-rock contact angle is measured, so that the wettability of the gas in the water phase environment on the surface of the mineral is obtained,and the wettability of the gas reservoir is revealed.

Description

technical field [0001] The invention relates to the field of oil and gas development research, in particular to a rock wettability measurement device and method in a formation water environment. Background technique [0002] Wettability is the tendency of a certain phase fluid in the mixed-phase fluid to spread or adhere to the solid surface, and it is one of the most important properties of the surface properties of solid materials. Wetting refers to the phenomenon that the gas or liquid phase spreads along the surface of the solid phase when the gas or liquid phase contacts the solid phase. Wetting contact angle can be used as a physical quantity to characterize the degree of surface wetting and surface free energy of mineral particles. Previous studies have found that on smooth and homogeneous mineral surfaces, the contact angle can be used as a measure of the wettability of the main mineral components in oil and gas reservoirs. Therefore, the wettability of minerals ca...

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Problems solved by technology

[0003] However, because the wettability of reservoir rocks is very complex, there is no satisfactory method to measure the wettability of reservoir rocks under formation conditions.

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