Method and device for calculating effective porosity of compact oil storage layer

A technology of effective porosity and tight oil, applied in the field of petroleum exploration, can solve the problem of ineffective pore volume of filling, etc., and achieve the effect of high accuracy

Inactive Publication Date: 2016-08-17
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In summary, it can be seen from the helium injection method and the liquid saturation method that the existing methods have a common defect: they

Method used

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  • Method and device for calculating effective porosity of compact oil storage layer
  • Method and device for calculating effective porosity of compact oil storage layer
  • Method and device for calculating effective porosity of compact oil storage layer

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Embodiment

[0115] In order to describe the features and working principle of the present invention more intuitively, a practical application scenario will be described below.

[0116] ①Sample preparation: drill a cylindrical rock sample with a diameter of 25.4mm or 38.1mm and a length of 25mm to 50mm on the core, and wash off the remaining oil and salt in the rock sample. After the rock samples were air-dried, they were dried in an oven until constant, and then cooled to room temperature in a desiccator. Finally, the rock sample was evacuated in a pressurized vacuum saturation device for 12 hours, and then pressurized and saturated with water for 16 hours.

[0117] ② The saturated rock sample is subjected to nuclear magnetic resonance measurement to obtain the saturated rock sample T 2 point magnitude. See the second column in Table 1 below.

[0118] ③According to the saturated rock sample T 2 Calculate the NMR porosity of rock samples by point amplitude. The calculation formula is: ...

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Abstract

The invention relates to a method and a device for calculating effective porosity of a compact oil storage layer. The method comprises the following steps: preparing a saturate rock sample; performing nuclear magnetic resonance measurement on the saturate rock sample, thereby acquiring T2 point amplitude of the saturate rock sample, nuclear magnetic porosity of the saturate rock sample and total amplitude of T2 spectrum of the saturate rock sample; performing dewatering treatment on the saturate rock sample under an effect of centrifugal force and performing the nuclear magnetic resonance measurement, thereby acquiring the T2 point amplitude of the centrifugal rock sample, the nuclear magnetic porosity of the centrifugal rock sample and the total amplitude of T2 spectrum of the centrifugal rock sample; acquiring the porosity component of the T2 point of the saturate rock sample, the curve of T2 spectrum of the saturate rock sample, the porosity component of the T2 point of the centrifugal rock sample and the curve of T2 spectrum of the centrifugal rock sample; acquiring a T2 cut-off value according to the total amplitude of T2 spectrum of the saturate rock sample, the curve of T2 spectrum of the saturate rock sample, the total amplitude of T2 spectrum of the centrifugal rock sample and the curve of T2 spectrum of the centrifugal rock sample; utilizing the T2 cut-off value to acquire the valid saturability of the flowing fluid; calculating the effective porosity of the compact oil storage layer according to the valid saturability of the flowing fluid.

Description

technical field [0001] The invention relates to the technical field of petroleum exploration, in particular to a method and device for calculating the effective porosity of tight oil reservoirs. Background technique [0002] At present, there are many methods for directly measuring the effective porosity of rocks. The principle is to saturate the rock sample to be tested with liquid or gas, and then calculate the volume of liquid or gas filled into the rock sample, which is used to represent the pore volume of the rock sample. . [0003] In practical applications, a common method is helium injection. The method is based on Boyle's law P 1 V 1 =P 2 V 2 , to measure the effective porosity of rock samples. Among them, the known P 1 and V 1 , determined P 2 V can be calculated 2 . at a certain pressure P 1 , so that a certain volume of V 1 The gas expands to the core chamber under normal pressure, and the original gas volume V can be obtained by measuring the balanc...

Claims

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Application Information

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IPC IPC(8): G01N15/08G01N24/08G01N1/28E21B49/00
CPCE21B49/00G01N1/28G01N15/088G01N24/081
Inventor 代全齐罗群张晨冉冶张云钊鲁少杰王建赵岩朱德宇
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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