Experimental device and evaluation method for simulating the erosion and dissolution of cement slurry on salt rock

Abstract

The invention discloses an experimental device and an evaluation method for simulating the scouring and dissolving effect of cement slurry on salt rock. A diaphragm pump, the pneumatic diaphragm pump communicates with a flushing device through a bellows, and the flushing device communicates with the cement slurry tank through a bellows. The invention is reasonable in design and convenient in operation, and can quantitatively analyze the scour degree of the cement slurry on the formation rock under different flow rates, temperatures and times, and study the mechanism of action between the cement slurry and the salt rock, and judge that after the cement slurry system is in contact with the salt rock formation, Whether it can still maintain good design performance provides a certain experimental basis for the design of the cement slurry system, the prediction of the variation range of the cement slurry performance, and the optimization of the cementing construction parameters, thereby improving the cementing quality.

Description

technical field [0001] The invention relates to the field of cementing technology, in particular to an experimental device and an evaluation method for simulating the erosion and dissolution of cement slurry on salt rock. Background technique [0002] For gypsum layer cementing, the design of the cement slurry system cannot be considered as conventional cement slurry. Since the gypsum layer is mainly composed of gypsum rock, salt rock and mud shale interlayer, the salt layer must be considered in the process of designing the cement slurry system. The influence of dissolution on the performance of cement slurry requires a certain understanding of the amount of dissolution under different conditions. [0003] Drilling to open the formation will destroy the original formation stress and form a large stress concentration near the wellbore. During the cementing process, the cement slurry will generate a certain shear force on the wellbore wall due to its certain viscosity. For h...

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Problems solved by technology

[0005] In the above-mentioned device, since the core support is sleeved in the core, it is very inconvenient to replace and disassemble the core in this way. No matter whether it is to replace the core support or the core, both of them need to be disassembled. This undoubtedly increases the workload of the staff. In addition, during the experiment, due to the different lengths of the selected rock cores, the length of the through cavity in the reactor body cannot be adjusted to match the length of the rock core, which has great limitations and cannot meet higher requirements. Experimental requirements

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