Portable core gas logging permeability measuring device

Abstract

The invention discloses a portable core gas logging permeability measuring device which comprises a core, a pressure sensor and a cylinder body, and further comprises a hand-operated hydraulic pump, a rubber sleeve, a piston, a piston drive device, a computing chip and a hydraulic display, and an emptying valve, wherein the core is placed in the cylinder body, the rubber sleeve is arranged between the core and the cylinder body, the hydraulic pump is arranged at the outer side of the cylinder body and connected with the rubber sleeve, the piston and the piston drive device are arranged in the cylinder body, an inner cavity is formed between one end face of the core and the piston, and the pressure sensor, the computing chip and the liquid crystal display as well as the emptying valve are arranged at the outer side of the cylinder body and connected with the inner cavity. The portable core gas logging permeability measuring device disclosed by the invention is small in volume, simple in structure, convenient to carry, and suitable for measuring permeability in field or well-drilling site.

Description

technical field [0001] The invention belongs to the technical field of petroleum engineering, and relates to a measurement technology of core permeability, in particular to a portable core gas permeability measurement device. Background technique [0002] In the petroleum industry, permeability is an important parameter to characterize the ability of oil and gas to pass through the reservoir rock. Gas or liquid is usually used as the medium to measure the permeability of the core. In laboratory experiments, the experimental medium for gas permeability measurement can be helium or nitrogen, and air can also be used to measure rock permeability if the experimental accuracy is not high; the experimental medium for liquid permeability measurement is generally water or crude oil. [0003] Under normal circumstances, the laboratory core test results are relatively accurate, but the experimental equipment is huge, has high environmental requirements, and is not easy to carry in the...

AI Technical Summary

Problems solved by technology

This method is relatively reliable and has many applications, but the operation is more complicated, the measurement time is long and the stability of the data is affected by many factors.

In the steady-state method, it is very difficult and not accurate enough to measure the fluid flow, especially the small flow of low-permeability rocks

[0005] Steady-state gas permeability measurement method is a common method for measuring rock core permeability at present, which mainly has the following disadvantages: the equipment is huge, not only needs to be equipped with nitrogen or helium gas source, but also requires a huge constant pressure chamber and constant pressure control device, which is inconvenient Field measurement; the pressure difference between the upstream and downstream constant pressure chambers cannot be strictly controlled, and a pressure feedback control device needs to be installed between the upstream and downstream to ensure that the pressure difference between the inlet and outlet of the core is constant, and it takes too long to achieve equilibrium; gas flowmeters generally use soap bubbles Flow meter or ball rise height measurement, due to the compressibility and viscosity of gas, the accuracy of the data measured by the above equipment is low

[0007] The unsteady-state method calculates the core permeability by measuring the change of pressure with time, which avoids the disadvantage of inaccurate gas flow measurement. However, due to the need for gas source, the equipment is relatively large, which is not suitable for field operations, and continuous measurement is required. It takes time to calculate the core permeability. If the gas flow is not stable, the measurement effect of the device is not good.

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