Method for detecting cementation strength of sealing agent

Abstract

The invention provides an experiment device and method used for detecting the bonding strength of a channeling sealing agent. The experiment device used for detecting the bonding strength of the channeling sealing agent comprises a casing pipe and a fluid pumping mechanism, the casing pipe is a hollow shell with the bottom end closed and the top end open, a liquid discharge opening is formed in the bottom end of the casing pipe, a flange cover is connected with the top end of the casing pipe and provided with a liquid inlet, an artificial core is arranged in the center of the interior of the casing pipe and provided with a plurality of cracks which are arranged from top to bottom and used for containing the channeling sealing agent, a cement ring is disposed between the artificial core and the casing pipe, and fluid is pumped into the cracks by means of the fluid pumping mechanism. The experiment device used for detecting the bonding strength of the channeling sealing agent has the advantages of being simple in structure, convenient to operate, real in simulation, quick in detection, precise in data, safe, reliable and the like, and can evaluate the plugging performance of a profile controlling and water plugging agent or a modifying and flooding agent system in a simulated mode. The method used for detecting the bonding strength of the channeling sealing agent has the advantages of being quick in detection, precise in data and the like.

Description

technical field [0001] The invention relates to the technical field of plugging and channeling adjustment of oil-water wells, in particular to an experimental device for detecting the cementation strength of a channeling sealing agent and a method for detecting the cementation strength of a channeling sealing agent. Background technique [0002] When the oil well undergoes multiple rounds of steam injection production, the cement sheath outside the casing is prone to damage or fall off locally due to the repeated erosion of the cement sheath by high-temperature hot and humid steam and the difference in expansion coefficient between the cement, rock and casing. There are gaps between the cement sheath itself and between the cement sheath and the pipe wall, and channeling channels are formed between different layers, water invades the oil layer, and the efficiency of production wells is low. At present, ash squeezing and channeling is a more common practice on site: under press...

AI Technical Summary

Problems solved by technology

The Chinese invention patent with the authorized notification number CN100545417C discloses a laboratory high-temperature and high-pressure mud cake cementation quality evaluation device, which simulates and evaluates the influence of downhole drilling fluid and mud cake on the cementing fluid interface cementation quality. To evaluate the effect of empty flushing, the cementation strength of the interface between the two is measured by pressure shear, and the hydraulic cementation strength of the interface is measured by the principle of water pressure channeling. However, the above-mentioned devices are complex in structure, inconvenient to operate, and there is a risk of high temperature and high pressure.

Images