High pressure low temperature liquid nitrogen pump hydraulic terminal

Abstract

The invention discloses a high pressure low temperature liquid nitrogen pump hydraulic terminal, belonging to the oil field liquid nitrogen conveyer device field. The high pressure low temperature pump hydraulic terminal of the invention comprises a plunger piston and a cylinder body; wherein the plunger piston and the cylinder body are sheathed and connected, the cylinder body is provided with an entire valve, a spacer bush is arranged between the cylinder body and the plunger piston, the spacer bush and the entire valve are connected, the outer surface of the spacer bush is provided with a first groove, the end face of the spacer bush far away from the entire valve is opened with a second groove which communicates the first groove and the interior of the spacer bush, the side wall of the cylinder body is provided with a precooling liquid inlet and a precooling liquid outlet, and the precooling liquid inlet and the precooling liquid outlet are respectively communicated with the first groove. The high pressure low temperature liquid nitrogen hydraulic terminal of the invention has simple structure, less quick-wear part and high reliability and is applicable to being popularized in the liquid nitrogen conveying field.

Description

technical field [0001] The invention relates to an oilfield liquid nitrogen delivery device, in particular to an oilfield liquid nitrogen pump. Background technique [0002] The liquid nitrogen pump is the core component of the liquid nitrogen pump truck. Its function is to realize the high-pressure pumping of liquid nitrogen or liquid carbon dioxide. Operation. Since the liquid nitrogen pump truck belongs to special operation equipment, the medium it transports has the characteristics of high pressure and low temperature. The low temperature medium will vaporize at room temperature and change from liquid to gas. Pre-cooling. At present, in the process of liquid nitrogen injection, how to inject liquid nitrogen safely and effectively is the core issue. Due to the influence of the physical characteristics of liquid nitrogen and the special process of liquid nitrogen, traditional medium injection devices, such as water injection pumps for oilfield water injection and fractu...

AI Technical Summary

Problems solved by technology

Due to the influence of the physical characteristics of liquid nitrogen and the special process of liquid nitrogen, traditional medium injection devices, such as water injection pumps for oilfield water injection and fracturing pumps for conventional fracturing, cannot pre-cool the pump chamber and cannot meet the requirements of Therefore, the three-cylinder pumps used in oil fields such as water injection pumps and fracturing pumps are not suitable for the transportation of cryogenic liquids

In addition, the liquid inlet valve group and the liquid discharge valve group used in the existing motorized reciprocating pump have a complex structure, many wearing parts, and low reliability.

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