Core cementing mold for sand consolidation formula performance evaluation and experimental method of core cementing mold

Abstract

The invention relates to a core cementing mold for sand consolidation formula performance evaluation and an experimental method of the core cementing mold. The core cementing mold for sand consolidation formula performance evaluation is prepared through the method that a 3D structure chart of the core cementing mold is drawn, wherein the shape of the mold is an annular cylinder, the annular cylinder is composed of an inner cylinder body and an outer cylinder body in a coaxial mode, fixing bands connected with the inner cylinder body and the outer cylinder body are arranged in an annular space,the two ends of the inner cylinder body are open, the upper end of the annular space is open, and the bottom end of the annular space is closed; the 3D structure chart is imported into a 3D printer,and the core cementing mold is printed through a polylactide material; and the annular space of the printed core cementing mold is filled with dried sand grains to simulate a sand bath environment, the lower end opening of the inner cylinder body is connected with a rubber plug with holes, waterproof glue is smeared at the connecting position, and a layer of screen is attached to the outer portionof the rubber plug with the holes. According to the core cementing mold, the annular space is filled with the sand grains to simulate the sand bath environment, and meanwhile an intact cemented corecan be taken out just by cutting the soft outer wall of the mold through a knife after core cementing is over, so that damage to the cemented core is avoided.

Description

[0001] Technical field: [0002] The invention relates to an oil well sand control technology, in particular to a core cementation mold and an experimental method for performance evaluation of a sand consolidation formula. [0003] Background technique: [0004] Sand production in oil wells is a common problem encountered in the development of unconsolidated sandstone oilfields. Sand production in oil wells will not only cause damage to oil production tools, increase the number of pump inspections, but also cause the rock around the casing to peel off and form a deficit. Casing is deformed or even damaged, and in severe cases, the well wall will collapse, and the oil well cannot continue to produce, which will bring great harm to the safe and efficient production of the oil well. [0005] At present, oil well sand control is mainly divided into mechanical sand control and chemical sand consolidation. Compared with mechanical sand control, chemical sand consolidation can fundame...

AI Technical Summary

Problems solved by technology

[0007] (1) The glass tube has relatively high hardness, and the cemented sand cannot expand naturally in the horizontal direction after being heated, and then expands in the vertical direction, resulting in many transverse cracks and cavities, which lead to large differences in the mechanical parameters and permeability of the cemented core;

[0008] (2) When using a glass tube as a mold, the glass tube needs to be broken after the cementation of the core to take out the cemented core. During the knocking process, the cemented core is easily damaged artificially, resulting in inaccurate evaluation results;

[0009] (3) The inner diameter of commonly used glass tubes is inaccurate and needs to be customized, which affects the progress of the experiment and costs a lot

[0010] Due to the inadequacy of using glass tubes as core cementation molds in the performance evaluation of chemical sand-consolidation formulas, the performance evaluation results of sand-consolidation formulas are inaccurate, which seriously affects the sand-consolidation effect of sand-producing formations

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