An experimental device and method for transporting sand-carrying fluid in simulated fracturing fractures

Abstract

The invention discloses an experimental device and method for transporting sand-carrying liquid in simulated fracturing fractures, which includes a spiral proppant transport device, a mixing tank, a screw pump, a liquid transport pump, a pressure gauge, a proppant migration and distribution system, and a swirl flow Desander, waste liquid recovery barrel, proppant recovery barrel, and fracturing fluid storage tank; the spiral proppant transport device is connected to the stirring tank, and the waste liquid recovery barrel and fracturing fluid storage tank are all connected by a liquid transfer pump It is connected with the stirring tank; the bottom end of the stirring tank is connected with the proppant migration and distribution system through a screw pump. By setting up a computer to accurately control the transparent three-dimensional crack component containing the hydraulic tank, the present invention can simulate the laying of sand-carrying liquid under a certain closing pressure. In addition, the transparent three-dimensional crack component can produce slight deformation without causing damage. , in order to study the laying rules of sand-carrying liquid in the opening and expansion stages of the fracture network system composed of hydraulic fractures and natural fractures.

Description

technical field [0001] The invention belongs to the technical field of hydraulic fracturing, and in particular relates to an experimental device and method for transporting sand-carrying fluid in simulated fracturing fractures. Background technique [0002] With the development of globalization, affected by the oil and gas situation at home and abroad, in order to ensure national energy security and enhance my country's domestic oil and gas exploration and development efforts, the state has made important instructions to increase oil and gas production. In the process of hydraulic fracturing, in addition to slick water, a large amount of proppant needs to be pumped in to prop up the fractures opened. Therefore, it is of great significance to better explore the placement of sand-carrying fluid in fracturing fractures in a way that is close to the formation. [0003] However, in the existing experimental simulation technology, there are still the following problems: (1) Altho...

AI Technical Summary

Problems solved by technology

[0003] However, in the existing experimental simulation technology, there are still the following problems: (1) Although the width of hydraulic fractures and natural fractures can be adjusted manually, it is equivalent to having been artificially set before the simulation experiment, which cannot be highlighted The width variation law of the proppant during laying process; (2) In the existing device, the two glass plates for simulating cracks are artificially fixed, without considering the crack closure pressure when the artificial cracks and natural cracks are cracked, so During the experiment, the fractures were in an open state, and it was impossible to simulate the distribution of proppant sanding during the opening and opening stages of hydraulic fractures and natural fractures; (3) The proppant would settle during the migration and laying process, especially When slick water is used to carry sand, the settling speed of the proppant is faster, resulting in the width of the lower part of the fracture being larger than the width of the upper part, which cannot be considered by existing devices

To sum up, in the existing technology, there is still a large gap compared with the real transport of sand-carrying fluid in fractures.

Images