Evaluation device and method for anti-water channeling effect of cement slurry

Abstract

The application provides a device and method for an anti-water channeling effect of cement slurry. The evaluation device comprises a water inlet device, a liquid collecting device, a sealed cylinder and a heat preservation device, wherein the water inlet device and the liquid collecting device are respectively connected to the inlet end and outlet end of the sealed cylinder, and the sealed cylinder is located in the heat preservation device; the sealed cylinder comprises an outer shell, an inner shell, end covers and seals; a cavity is formed between the inner shell and the outer shell, both ends of the outer shell are installed with the end covers, two seals respectively pass through the end covers and the inner shell and extend to the middle part of the inner shell, a simulated wellboreis arranged between the two seals, a simulated casing is installed in the simulated wellbore, and the cement slurry is set in the gap between the simulated casing and the simulated wellbore and is squeezed by the inner shell. The evaluation method comprises the following steps of saturating the simulated wellbore with water; assembling the evaluation device; applying pressure in the cavity area; simulating the process of water channeling; taking out the cement stone and testing the bonding strength.

Description

technical field [0001] The present application relates to but not limited to the field of cementing technology, in particular to an evaluation device and evaluation method for the water-proof effect of cement slurry. Background technique [0002] Most of the oilfields in my country have entered the high water-cut production period, and water injection development is the main development method. In order to better enhance oil recovery, it is necessary to intensify the well pattern to improve the sweep efficiency of water flooding, which makes infill wells face the problem of water channeling during cementing operations. During the cementing operation of infill wells, the formation water will scour the cement slurry and enter it during the process of cement slurry displacement and curing, forming water channeling channels, resulting in the destruction of the cement sheath structure and the decline of cementation quality, which will affect the oil and gas field follow-up. The ...

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Problems solved by technology

During the cementing operation of infill wells, the formation water will scour the cement slurry and enter it during the process of cement slurry displacement and curing, forming water channeling channels, resulting in the destruction of the cement sheath structure and the decline of cementation quality, which will affect the oil and gas field follow-up. The production and production increase measures have adversely affected

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