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Method for quantitatively calculating rock core pore connectivity

A quantitative calculation and connectivity technology, applied in measurement devices, suspension and porous material analysis, instruments, etc., can solve problems such as measurement of difficult-to-connect relationships, and achieve the effect of solving difficult quantitative calculations.

Active Publication Date: 2020-04-10
CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

Mercury porosimetry and nuclear magnetic resonance can obtain the pore size distribution of the core, but it is difficult to measure the connectivity relationship between pores of different pore sizes

Method used

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  • Method for quantitatively calculating rock core pore connectivity
  • Method for quantitatively calculating rock core pore connectivity
  • Method for quantitatively calculating rock core pore connectivity

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Embodiment Construction

[0028] Such as figure 1 As shown, the present invention provides a kind of method that can quantitatively measure the connection relationship between the pores of different pore diameters to calculate the connectivity of the core pores, comprising the following steps:

[0029] S1: NMR experiments on water-saturated cores;

[0030] S2: The rock core is centrifuged multiple times, and the nuclear magnetic resonance experiment is carried out on the rock core after each centrifugation;

[0031] S3: Calculate the pore radius corresponding to the centrifugal force;

[0032] S4: Quantitative calculation of pore connectivity.

[0033] Each step is described in detail below.

[0034] The nuclear magnetic resonance experiment steps of the water-saturated rock core include washing and drying the rock core, vacuuming and then saturating with water. In the saturated water state, carry out nuclear magnetic resonance experiments, test and draw nuclear magnetic resonance T 2 spectral cur...

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Abstract

The invention provides a method for calculating rock core pore connectivity, which can quantitatively measure the connectivity relationship among pores with different pore diameters. The method comprises the steps of: S1, performing a nuclear magnetic resonance experiment on a saturated water rock core; S2, centrifuging the rock core for multiple times, and carrying out a nuclear magnetic resonance experiment on the rock core after each centrifugation; S3, calculating a pore radius corresponding to a centrifugal force; and S4, quantitatively calculating the pore connectivity. According to themethod, the problem that the pore connectivity is difficult to quantitatively calculate is solved by adopting the method of combining nuclear magnetic resonance and multiple times of centrifugation.

Description

technical field [0001] The invention belongs to the field of oil and gas reservoir development, in particular to a method for quantitatively calculating the connectivity of rock core pores. Background technique [0002] Pore ​​connectivity is an important parameter in the development of oil and gas reservoirs. It reflects the storage capacity and permeability of oil and gas reservoirs, affects the fluidity of oil and gas, the productivity of oil and gas wells, and the recovery factor of oil and gas reservoirs. It has important guiding significance for the formulation of production systems and development plans. [0003] Conventional experimental methods for analyzing pore connectivity include: CT scanning, scanning electron microscopy, mercury porosimetry, nuclear magnetic resonance, etc., but CT scanning and scanning electron microscopy can only conduct microscopic and qualitative analysis of the connectivity of a single or several pores , it is difficult to carry out macr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08
CPCG01N15/088
Inventor 莫非戚志林严文德黄小亮李继强田青方飞飞程柯扬石书强
Owner CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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