A kind of sand laying experimental device and method for visual intelligent proppant pulse injection

Abstract

The invention discloses a sand laying experiment device and method for pulse injection of visualized intelligent proppant, which comprises a screw pump, a liquid distribution tank, a liquid storage tank, a sand box, a sand mixing tank, a wellbore simulation device, a visualized crack simulation device, an intelligent electric transfer switch and filter device, the sand box is set on the sand mixing tank; the visual crack simulation device is connected to the wellbore simulation device, and the intelligent electric transfer switch is respectively connected with the liquid storage tank and the sand mixing tank through pipelines. The tank and the wellbore simulation device are connected, and the liquid distribution tank is respectively connected with the screw pump, the liquid storage tank, the sand mixing tank and the filter device through the pipeline, and the filter device is connected with the fracture simulation device through the pipeline. The device can intelligently add sand and control key parameters such as sand ratio, accurately control the pulse time and simulate the impact of natural fractures on pulse sand addition; visually observe the settlement of proppant in the fracture and the shape of sanding, and can carry out repeated experiments. The cleaning efficiency of the device is high.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field development and research, and in particular relates to a sand laying experimental device and method for pulse injection of visualized intelligent proppant. Background technique [0002] Pulse sand fracturing is to use sand mixing equipment to uniformly mix fracturing fluid and proppant (and add fibers) to form sand mixing fluid and fracturing fluid to alternately inject into the fracturing target layer at a certain pulse interval, that is, pulse type Pump in a section of sand mixing liquid, then pump in a section of pure liquid, and repeat the alternating cycle injection. The pulse sanding method makes the pure liquid and the sand mixing liquid containing proppant exist alternately, and the pure liquid effectively isolates the proppant of the sand mixing liquid, leaving a certain space between the proppant clusters, forming a discontinuous laying of proppant , A stable circulation chann...

AI Technical Summary

Problems solved by technology

[0004] Therefore, new requirements are put forward for the sand-spraying experimental device of visualized intelligent proppant pulse injection, including: 1) It can intelligently add sand and control key parameters such as sand ratio; 2) It can realize accurate control of pulse time parameters; 3) It can simulate Pulse sanding will affect the proppant placement of artificial fractures when there are natural fractures; 4) Efficient cleaning of the experimental device when repeated experiments are carried out; currently there is no proppant that can achieve visualized intelligent proppant pulse injection. Sand experiment device

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