Fracturing pulse sand filling system with ultrahigh flow conductivity and method for operating fracturing pulse sand filling system

Abstract

The invention relates to a fracturing pulse sand filling system with ultrahigh flow conductivity. The fracturing pulse sand filling system comprises an external control unit, an internal controlled unit, an external fracturing pump truck unit, a sand mixing truck and a fluid storage tank. Fracturing sand-mixed fluid is accommodated in the sand mixing truck, fracturing base fluid is accommodated in the fluid storage tank, the external control unit controls the internal controlled unit, so that the sand-mixed fluid in the sand mixing truck and the base fluid in the fluid storage are alternately pumped into the external fracturing pump truck unit at intervals, and the sand-mixed fluid and the base fluid are finally alternately pumped into underground exploitation cracks at intervals by the external fracturing pump truck unit. The fracturing pulse sand filling system has the advantages that propping agent slugs added with fibers can be injected in a pulse manner under the control of the system, the flow conductivity of the prop cracks is greatly improved, a lag effect due to continuous opening and closing of an existing sand mixing truck is prevented, damage to the sand mixing truck is reduced, and pressure building during propping agent injection can be effectively prevented by the system.

Description

technical field [0001] The invention relates to a fracturing pulse sanding system and a working method thereof for realizing ultra-high conductivity, and belongs to the technical field of oil and gas field development and research. Background technique [0002] In the process of conventional hydraulic fracturing, the construction process is basically to inject the proppant into the formation continuously with the pre-set sand ratio after the pre-fluid is injected, and to fill the fracturing fractures. Compared with the original oil and gas reservoirs, its conductivity is indeed much improved. However, due to the damage of fracturing fluid to fracture conductivity, the fragmentation of proppant, the clogging of pores by debris falling off the fracture wall after pressure, and the embedding of proppant, etc., the conductivity of fracturing fractures will be greatly reduced. , the actual conductivity after fracturing is far lower than the experimental value, so the production ...

AI Technical Summary

Problems solved by technology

At present, when the proppant is injected into the sand mixing truck, the continuous injection is basically selected, and the slug injection of the proppant cannot be realized. To realize this function, the machine needs to be switched on and off intermittently, which will be caused by repeated startup of the machine. The hysteresis effect will cause damage to the machine itself; and the sand mixer is running normally, and the injection valve will be opened intermittently, but this will cause intermittent pressure in the sand mixer, causing damage to the machine and increasing equipment Machine maintenance and repair costs

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