Proppant conveying experimental device and method capable of obtaining proppant particle size distribution

Abstract

The invention relates to a proppant conveying experimental device and method capable of obtaining proppant particle size distribution. The device consists of a sand mixing tank 1, a screw pump 3, a simulated inlet shaft 17, a proppant conveying system 20, a particle size classification system 7, a mechanical segmentation system H, a simulated outlet shaft 9, a cyclone desander 28, a proppant recovery barrel 27, a liquid storage tank 29 and a liquid conveying pump 31. The method comprises the following steps of preparing a fracturing fluid, storing the fracturing fluid in the liquid storage tank, and pouring a proppant into the sand mixing tank; starting the liquid conveying pump and the sand mixing tank to uniformly mix the fracturing fluid and the proppant; enabling liquid carrying sand to enter a simulated fracture through the simulated inlet shaft, and then flow into the cyclone desander through the simulated outlet shaft and a pipeline; and opening a pore channel of a narrow plateat the upper part of the proppant conveying system, isolating the inner space of the simulated fracture by using the mechanical segmentation system, and acquiring the proppant particle size distribution information at different positions in the simulated fracture. A theoretical basis is provided for fracturing parameter design and proppant optimization, and the application prospect is wide.

Description

technical field [0001] The invention relates to the field of research on the law of proppant laying in the process of hydraulic fracturing, and in particular to a proppant delivery experimental device and method capable of obtaining the particle size distribution of the proppant. Background technique [0002] With the continuous reduction of conventional oil and gas reserves, people began to shift their focus to the development of unconventional oil and gas resources. Unconventional oil and gas refers to the fact that traditional technologies cannot obtain natural industrial production, and new technologies need to be used to improve reservoir permeability or fluid viscosity, etc. Oil and gas resources that can be exploited economically. At present, hydraulic fracturing is the most effective method to enhance the recovery of oil reservoirs. In the process of hydraulic fracturing, a large amount of fracturing fluid is injected into the well at a high enough rate to rupture th...

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Problems solved by technology

The above method or device only enriches the functions of the device in terms of pressure, temperature, variable fracture width, variable branch angle, etc., but the particle size distribution of proppant in fractures is a key factor affecting the final stimulation effect. Taking these factors into consideration, the patent application "Fracturing proppant particle size rapid evaluation device and application method" (CN109490155A), "Method for studying multi-stage fracturing proppant particle size and rock mass fracture characteristic parameters" (CN102749437A ) both proposed a device that uses particle screen sorting to obtain proppant particle size distribution information, but it is not used to obtain particle size distribution information in proppant migration and laying results

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