Calibration method of core-based 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: 2015-06-17
SOUTHWEST PETROLEUM UNIV
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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 ob

Method used

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  • Calibration method of core-based gas permeability measuring device
  • Calibration method of core-based gas permeability measuring device
  • Calibration method of core-based gas permeability measuring device

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Embodiment 1

[0021] A device for measuring core gas permeability, such as figure 1 As shown, the device includes a core holder 6, one side of the core holder is 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 The three-way valve 8 and the soap film flow meter 9; the three-way valve 4 is connected with a pressure sensor 3, the four-way valve 8 is connected with a pressure sensor 7, and the core holder 6 is also connected with a high-pressure manual metering pump 10, the high-pressure manual metering pump A drain valve 11 is provided on 10, 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 20, a core rubber sleeve 17 installed in the cylinder 20, and a sheath 16 installed on both sides of the cylinder 20. The cylinder 20 is provided with a m...

Embodiment 2

[0025] Core gas permeability measurement

[0026] Turn on nitrogen to remove the air in the pipeline. Use a vernier caliper to measure the length and width of the core 5 to be tested, and calculate the cross-sectional area A. Measure the length L of the core 5. Then the core 5 is put into the core rubber sleeve 17 in the core holder 6, and the core 5 is sealed in the 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 core holder annulus, close the drain valve 11, rotate the outer wheel of the high-pressure manual metering pump 10 clockwise, pressurize it to 5MPa, and close the ring pressure valve 12 . Open the pressure reducing and stabilizing valve 2, the first booster pump 13, the three-way valve 4, the second booster pump 14, and the four-way valve 8 of the nitrogen cylinder 1, and the core inlet pressure P is obtained by the pressure sensor 3 1 , The pressure sensor 7 read...

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Abstract

The invention discloses a calibration method of a core-based gas permeability measuring device. The calibration method comprises the following steps of clearing away air in a pipeline by adopting nitrogen; collecting cross section areas and lengths of to-be-measured cores and clamping the to-be-measured cores in a core holder; controlling the inlet pressure of the core holder by adjusting a gas permeability tester, and collecting pressure values and the core outlet flow rate; fitting out the functional relationship by quadratic difference of the core outlet flow rate and the steady inlet and outlet pressure. According to the functional relationship and the Darcy law, the corresponding inlet pressure and the gas-measured permeability are calculated at the utmost pressure, the relation function of the gas-measured permeability and the reciprocal value of the average pressure is created, and the nodal increment of the horizontal segment of the section function is regarded as Kerr permeability. The absolute core permeability can be quickly and accurately obtained by the gas-measured permeability calibration method-a theoretical limit method.

Description

Technical field [0001] The invention relates to a method for measuring the absolute permeability of a core, in particular to obtain the Kelvin permeability of a target core through a calibration method based on a 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 oilfield development plans, it is first necessary to conduct core gas permeability experiments to evaluate the absolute permeability of the core to be tested and provide basic data for development plans and other work . The commonly used experimental method is: use the experimental device to measure the inlet pressure (the outlet pressure is atmospheric pressure) at the two ends of the five to ten sets of cores, and the volumetric flow data of the gas in the core. Then, the Darcy formula is used to calculate the gas permeability under different inlet pressures, and then ...

Claims

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Application Information

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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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