Proppant laying visualization experiment device capable of dynamically adjusting seam width and using method thereof

Abstract

The invention discloses a proppant laying visualization experiment device capable of dynamically adjusting the seam width and a using method thereof. The proppant laying visualization experiment device comprises a feeding mechanism, and the feeding mechanism is used for preparing and conveying sand mixing liquid; and the discharging end of the feeding mechanism is connected with a visualization flat plate crack, the visualization flat plate crack is formed by visualization flat plates (1), each visualization flat plate (1) is composed of two metal frames (3) and a sealing piece (4), each sealing piece (4) is arranged between two metal frames (3), and tempered glass (5) is fixed in frameworks of the metal frames (3). The visualization flat plate crack for simulating a fracturing crack is formed between the two visualization flat plates (1), and the width of the visualization flat plate crack is adjusted by a limiting and fixing mechanism (2). The proppant laying visualization experiment device is suitable for multi-stage sand adding and variable displacement sand adding experiments, and the better device is provided for studying the influence of pump injection parameters on the proppant conveying rule in the fracturing process.

Description

technical field [0001] The invention relates to the field of oil exploitation and research, in particular to a proppant laying visualization experimental device for dynamically adjusting the width of a fracture and a use method thereof. Background technique [0002] In the development of unconventional oil and gas reservoirs, hydraulic fracturing has become the main development method, but what ultimately affects the fracturing effect is the effect of proppant placement in the fractures formed by fracturing. At present, many scholars have used flat-plate sand-laying devices to study the laying effect and regularity of sand-carrying fluid in fractures. However, the existing sand-spreading devices mainly focus on the research of variable angles of branch joints and different widths of single joints, and there are few related studies on multi-stage sanding with variable displacement. [0003] For example, the patent application with the application number CN206903650U disclose...

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Problems solved by technology

At the same time, driven by the sensitive new spring, the dynamic cracks can form parallel cracks and wedge-shaped cracks, which can more realistically simulate various crack shapes that may be encountered on site, but the device controls the relative position of the metal plate through the spring to adjust the crack width. Quantitatively characterize the pressure distribution characteristics on the surface of the metal plate, and the device can only be adjusted in one direction to provide two forms of parallel stitching wedge-shaped seams, and its function of passively adjusting the seam width determines that it cannot actively adjust the shape of the seam

[0004] For example, the patent application with the application number CN111622730A discloses a design method for fracturing and sanding based on the experiment of large-scale parallel plate proppant migration and laying model. This method determines the value range of each construction parameter according to the fracturing target. The slab proppant migration and laying physical model experimental device conducts control experiments on various construction parameters, obtains the migration of proppant under different parameters and the final sand bank shape pictures, and uses the sand bank shape evaluation parameters to quantitatively evaluate the final sand bank shape , optimize the construction parameters, measure the horizontal migration velocity and vertical settlement velocity of the proppant under different conditions, calculate the propping height and the length of the horizontal propped fracture, and determine the sanding parameters of each stage of fracturing after checking. The ratio of the fracturing fluid to the fracturing fluid determines the final fracturing and sanding construction plan. This technology mainly includes the design of the experiment and the analysis of the experimental results, and does not combine the structural characteristics of the sanding device. At the same time, this technology is not designed for multi-stage sanding

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