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Method for determining compact rock porosity

A technology of tight rock and porosity, applied in the field of rock porosity determination, can solve the problems of inaccurate measurement results, low measurement accuracy, and difficult to find, and achieve the effect of reducing dead volume, improving measurement accuracy, and rapid measurement.

Inactive Publication Date: 2005-11-09
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. The lines set by the existing measurement method are lengthy and the dead volume is large. Negative porosity will appear in tight cores with low permeability, and the measurement results are inaccurate
[0005] 2. The gas pressure in the existing measurement method system is low, the balance time is long, the measurement efficiency is low, and the measurement accuracy is low
[0006] 3. The lines set by the existing measurement method are lengthy, micro air leakage is prone to occur at the joint, and it is difficult to find, which affects the measurement effect
[0007] 4. Existing measurement methods require multiple processes such as vacuuming, pressurization, and balancing, and the measurement process is complicated and the measurement time is relatively long
[0008] 5. When the gas diffuses into the pores of the rock sample in the existing measurement method, the gas pressure is low, and it is difficult for the gas molecules to enter the pores with small diameters, so it takes a long time to balance
If the equilibration time is insufficient, the determination affects the accuracy

Method used

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  • Method for determining compact rock porosity
  • Method for determining compact rock porosity
  • Method for determining compact rock porosity

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Experimental program
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Embodiment 1

[0039] Such as figure 1 Shown, be the structural representation of embodiment one of the present invention, as can be seen from the figure, A is the standard volume air chamber of known volume (volume 1-8cm 3 ), that is, the low pressure chamber; B is the high pressure chamber, and the rock sample to be tested is placed in the high pressure chamber B, so it can also be called a holder; C is a pressure charging device, which can use a gas source bottle for Pressure chamber B is pressurized; D is a pressure measuring device, and a pressure gauge can be used to measure the air pressure in the high pressure chamber B where the rock samples to be tested are placed under different conditions; E is a confining pressure pump, 1, 2 , 3, 4 are more than one valves arranged on the pipeline, which are used to control the flow direction of the air flow. They are respectively arranged on the pipeline connecting the two adjacent parts of the low pressure chamber A, the pressure measuring de...

Embodiment 2

[0059] Such as figure 2 Shown is a schematic structural diagram of Embodiment 2 of the present invention. It can be seen from the figure that the valve F is a multi-way valve combined with the valves 1, 2 and 3 in the first embodiment to realize the multiple functions of the valves 1, 2 and 3 in the first embodiment, and the multi-way valve F and Pressure measuring device (pressure gauge) D connection.

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Abstract

The invention discloses a method for measuring thickening rock hole gap rate. It at least includes: puts the sample into the measuring instrument, presses with confining pressure pump; presses the high pressure room; measures the pressure value of high pressure room; measures the pressure value of low pressure room; connects the low pressure room and the high pressure room, and measures the even pressure value; calculates the hole gap volume of the sample, measures and calculates the vision volume of the sample, gets the rock sample hole gap rate.

Description

technical field [0001] The invention relates to a method for measuring the porosity of rocks, in particular to a method for measuring the pore volume and porosity of tight rocks in low-permeability oil and gas reservoirs by using the drop of pore pressure. Background technique [0002] At present, there are many methods that can measure the porosity of tight rocks, and these basic methods include: kerosene method, waxing method and gas method. The measurement process of the gas method porosimeter is as follows: firstly, the low-pressure gas is filled into a container A with a known volume, and then the valve is opened to release the gas into the rock sample chamber B, that is, the process (A→B), and the measurement before and after the deflation The pressure, using Boyle's law, calculate the pore volume and porosity. This method is very effective for rock samples with large pores and high porosity, because the gas can easily enter the pores of the rock. However, the pore d...

Claims

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Application Information

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IPC IPC(8): G01N7/10G01N15/08
Inventor 杨胜来
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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