An integrated device for mixing and displacing two fluids and its application method

Abstract

The invention discloses an integrated device for mixing and displacing two fluids and an application method thereof. The device comprises an auxiliary fluid delivery unit, a working fluid delivery unit and a mixing tank. The auxiliary fluid delivery unit and the working fluid delivery unit respectively pump the auxiliary fluid and the working fluid into the mixing tank for mixing, and then drive the obtained mixed solution to the subsequent experimental testing device. The mixing tank is a sealed cylindrical tank, and an isolation piston that can move up and down is arranged in the mixing tank, and the piston divides the cavity in the tank into an upper cavity and a lower cavity that are independently isolated; an agitator is set in the lower cavity, The bottom of the lower chamber is provided with super-auxiliary fluid inlet and working fluid inlet, and the top of the upper chamber is provided with clean water inlet and outlet. The working fluid delivery unit includes a working fluid tank, a clean water tank and a plunger pump. The device of the invention has the integrated functions of mixed liquid generation and displacement, which not only saves the experiment cost, but also improves the experiment efficiency.

Description

technical field [0001] The invention relates to the technical field of oil and gas field exploitation, in particular to a gas-liquid mixing and displacement integrated device and a use method thereof. Background technique [0002] Fracturing and acidizing is an important technical measure for the production and stimulation of oil and gas wells. However, for low-pressure oil and gas reservoirs, when conventional fracturing and acidizing technology is used, a large amount of working fluid (fracturing fluid, acid liquid, etc.) enters the formation. Due to the low formation pressure, The flowback of the working fluid is difficult, and the large retention of the working fluid increases the damage to the pores and fractures of the reservoir and reduces the stimulation effect. Therefore CO 2 or N 2 It is often used in fracturing and acidizing technology, using multi-fluid mixed fracturing and acidizing technology mode, such as CO 2 Foam fracturing, CO 2 Foam Acidification, N 2...

AI Technical Summary

Problems solved by technology

However, at present, there are the following limitations in the general petroleum engineering experimental liquid mixing devices at home and abroad: ①The liquid storage tank does not have a heating function, and the fluid is preheated by the electric heating jacket of the pipeline during the displacement process, and the fluid often has not reached the experimental design temperature. Flowing through the core, the experimental results are not representative; ② When the plunger pump is used to directly pump and displace fluids, especially highly corrosive fluids such as acid, the piston of the pump head is in a highly corrosive environment for a long time, requiring highly anti-corrosion materials. And long-term maintenance, the cost of the experiment is extremely high; ③The liquid storage tank cannot work under pressure, resulting in the inability to configure, store, and displace the mixed fluid of gas and liquid, and the simulation function of the device is limited

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