Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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)
View PDF3 Cites 41 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 cannot remove the ineffective pore volume controlled by narrow throats or filled by hydrophilic mineral particles in the connected pores of rock samples.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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

Examples

Experimental program
Comparison scheme
Effect test

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: ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
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)
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com