Axial pressure device used for core holder

Abstract

The invention provides an axial pressure device used for a core holder. The axial pressure device comprises a regulating choke plug and an axial pressure piston assembly, wherein the regulating choke plug is axially inserted into one side of the core holder and supported on the side end of a core to be measured in the core holder; the axial pressure piston assembly is sheathed on the outer wall of the regulating choke plug, the axial pressure piston assembly comprises an axial pressure barrel and an axial pressure piston, the axial pressure barrel is fixedly connected with a compaction nut located on one side of the core holder, the axial pressure piston is arranged in the axial pressure barrel and axially sheathed on the outer wall of the regulating choke plug in a sliding manner; the axial pressure piston is connected with the regulating choke plug through an axial pressure screw cap, and the regulating choke plug is driven to apply an axial pressure to the core to be measured by the axial pressure piston. The axial pressure device, provided by the invention, has the advantages of easy assembly and disassembly, convenience for cleaning, good sealing effect, adjustable length of the choke plug, small experiment error and wide application range.

Description

technical field [0001] The invention relates to a rock core reservoir physical simulation test device, in particular to an axial pressure device for a rock core holder. Background technique [0002] As we all know, development experiments are the basis of oil and gas field development, which can not only provide basic reservoir parameters for reservoir calculation, development plan formulation, reservoir numerical simulation, etc., but also provide information for solving many problems encountered in reservoir development. method guaranteed. Core holders are one of the most widely used basic components in development experiments, and core holders are used in almost all development experiments. [0003] At present, the existing core holders are mainly divided into two types according to the pressurization method. One is the Hassler (Hassler) core holder, which places the core in a circular rubber sleeve and separates A steel cylindrical plug with a central through hole is p...

AI Technical Summary

Problems solved by technology

Moreover, since the axial pressurizing device is fixed at one end of the holder, and the plug connected to the axial pressurizing device is fixed accordingly, it will cause difficulties in loading and unloading samples and cleaning, and defects in cleaning will directly affect the measurement effect

[0005] 2. Due to the threaded connection between the plug and the plug locking cap of the existing triaxial core holder, it is inconvenient to use a cylinder device when loading and unloading the core, and it is easy to damage the core

In addition, the brine in the rock is easy to accumulate on the thread, which is easy to cause thread corrosion

[0006] 3. During the measurement process, if the length of the sample changes greatly, it is necessary to use a filler block, which causes difficulty in loading and unloading, and increases the dead volume of the inlet and outlet, resulting in an increase in the experimental error

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