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A calibration method based on core gas permeability measuring device

A technology of air permeability measurement and measuring device, which is applied in the field of Kirkland's permeability, can solve the problems of influence of experimental results, reduction of relative error, poor stability of linear flow, etc., and achieve the effect of reducing research cost, reducing relative error, and improving understanding

Active Publication Date: 2018-05-22
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

In order to achieve this condition, the inlet pressure setting value of the gas permeability test should be set from a lower pressure as far as possible to ensure that the fluid seepage in the measured core is a linear flow, but the lower the pressure, the more obvious the slippage effect of the gas seepage. The greater the error caused by the method correction; the slippage effect of the gas is small at high pressure, but its linear flow stability is poor
Therefore, there are still the following problems in the determination of gas permeability: ① The data points of the inlet pressure and gas volume flow rate of the core obtained by the experiment satisfying the conditions of Darcy's law are few in number, and there are human errors in the experimental process, which will affect the experimental results. great influence
② In particular, the gas permeability experiment of low-permeability cores takes a long time and cannot minimize the relative error
③Kirls Permeability is the inherent property of the corresponding rock core under the ultimate pressure. If the inlet pressure can be infinitely increased while ensuring linear flow, the closer the obtained permeability is to the Kr. A condition cannot be achieved by existing experimental conditions

Method used

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  • A calibration method based on core gas permeability measuring device
  • A calibration method based on core gas permeability measuring device
  • A calibration method based on core gas permeability measuring device

Examples

Experimental program
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Effect test

Embodiment 1

[0021] A device for measuring rock core gas permeability, such as figure 1 As shown, the device includes a core holder 6, one side of the core holder is sequentially connected with a three-way valve 4, a first booster pump 13 and a nitrogen cylinder 1, and the other side is sequentially provided with a second booster pump 14, four One-way valve 8 and soap film flowmeter 9; three-way valve 4 is connected with pressure sensor 3, four-way valve 8 is connected with pressure sensor 7, and rock core holder 6 is also connected with high-pressure manual metering pump 10, and this high-pressure manual metering pump 10 is provided with a drain valve 11, and a ring pressure valve 12 is provided between the high-pressure manual metering pump 10 and the core holder 6.

[0022] Such as figure 2 As shown, the core holder 8 includes a cylinder body 20, a core rubber sleeve 17 installed in the cylinder body 20, and sheaths 16 installed on both sides of the cylinder body 20. After the throug...

Embodiment 2

[0025] Measurement of Core Gas Permeability

[0026] Turn on the nitrogen gas to clear the air in the pipeline. Use a vernier caliper to measure the length and width of the section of the rock core 5 to be tested, and calculate the cross-sectional area A. The length L of the rock core 5 is measured. Then the rock core 5 is put into the rock core rubber sleeve 17 in the rock core holder 6, and the rock core 5 is sealed in the rock core rubber sleeve 17 with the sheath 16. Then open the high-pressure manual metering pump 10 and the ring pressure valve 12 to discharge the gas in the annulus of the core holder, close the drain valve 11, rotate the outer wheel of the high-pressure manual metering pump 10 clockwise, pressurize to 5 MPa, and close the ring pressure valve 12 . Open the pressure reducing and stabilizing valve 2 of the nitrogen cylinder 1, the first booster pump 13, the three-way valve 4, the second booster pump 14, the four-way valve 8, and obtain the core inlet pre...

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Abstract

The invention provides a calibration method based on a rock core gas permeability measurement device. The method includes using nitrogen to clean the air in the pipeline; collecting the cross-sectional area and length of the rock core to be tested, and clamping the rock core to be tested in the core holder; controlling the core holder by adjusting the gas permeability tester Inlet pressure, collected pressure value and core outlet flow; use the data of the square difference between the flow at the outlet end of the core and the stable pressure at the inlet and outlet to fit the function relationship. Using this function relationship, combined with Darcy's law, calculate the corresponding inlet pressure and gas permeability under the ultimate pressure, and establish the relationship function between gas permeability and the reciprocal of the average pressure. permeability. The gas permeability correction method of the present invention—theoretical limit method can quickly and accurately obtain the absolute permeability of the rock core.

Description

technical field [0001] The invention relates to a method for measuring the absolute permeability of a rock core, in particular to obtain the Kirschner permeability of a target rock core through a correction method based on a rock core gas permeability measurement device. Background technique [0002] Core permeability is an important parameter in the evaluation and development of oil and gas fields. In the process of formulating an oilfield development plan, it is first necessary to conduct a core gas permeability experiment to evaluate the absolute permeability of the core to be tested and provide basic data for the development plan and other work . The commonly used experimental method is: use the experimental device to measure the inlet pressure at both ends of five to ten groups of rock cores (the outlet pressure is atmospheric pressure), and the volume flow data of the gas in the rock core. Then use the Darcy formula to calculate the gas permeability at different inlet...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/08
Inventor 施雷庭朱文锋彭勇朱珊珊曹杰舒政
Owner SOUTHWEST PETROLEUM UNIV
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