Equal-displacement constant pressure control method and equal-displacement constant pressure valve

Abstract

The invention relates to an equal-displacement constant pressure control method and an equal-displacement constant pressure valve. The valve comprises a valve body, wherein a hollow part of the valve body forms a valve rod channel; a valve rod is movably arranged in the valve rod channel in a penetrating manner; two sealing devices capable of sealing the valve rod channel are arranged on the valve rod; a closed space interval is formed between the two sealing devices and can seal a fluid outlet; two branch inlets are formed in a length direction of the valve rod in the side wall of the valve body, and communicated with an inlet flow channel; and the branch inlets and a fluid inlet are positioned in two sides of the fluid outlet respectively. According to the invention, during a displacement process of the valve rod of the valve, a fluid which is compressed to one side can be supplemented to the other side for releasing the space, so that the total volume of the fluid is not changed in the space of the valve flow channel; the pressure of a closed system is maintained to be constant during a switching process of the valve, and the pressure fluctuation during the switching process of the general valve is eliminated; and the equal-displacement constant pressure control method and the equal-displacement constant pressure valve are suitable for switch control of the closed system in which the volume of the fluid is small.

Description

technical field [0001] The invention relates to an equal-displacement constant-pressure control method and an equal-displacement constant-pressure valve capable of eliminating the pressure fluctuation phenomenon of the valve during the opening and closing process, and belongs to the technical field of oil and gas field development experiments. Background technique [0002] Valves are widely used in various industries, and there are many kinds of them. In the oil and gas field development experiment, 3mm needle valve or ball valve is widely used in the low flow experimental process, which is characterized by simple control and high pressure resistance; the pressure resistance of the ball valve is less than 15MPa, and the needle valve can be no less than 100MPa. [0003] The pore volume of the microphysical model is very small, ranging from 0.01 μL to 1 mL. In the microscopic physics simulation experiment, it is required that there are on-off valves on both sides of the micro...

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Problems solved by technology

For example, method 1 requires that the fluid must be single-phase. For example, when the foam fluid passes through, it will change the volume of the gas phase in the foam, which will make the simulation process of this type of fluid more realistic; The flow resistance at the entrance of the needle tip is too large, which is easy to mislead the experimental operation

If method 2 is used in the displacement process, the driving fluid cannot enter the observation range for a long time. If the driving fluid interacts with the fluid in the model, the long waiting time for observation has already made the observation lag, resulting in the opportunity to recognize the experimental phenomenon. big mistake

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