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A method for quantitative evaluation of pore-throat producing law in the secondary migration of oil and gas

A quantitative evaluation, oil and gas technology, applied in the field of oil and gas exploration and testing, can solve problems such as the production law of oil and gas pore throats that are not involved in quantitative evaluation, and achieve the effect of clear conclusions, true experimental results, and rich information

Active Publication Date: 2016-03-23
XI'AN PETROLEUM UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

None of the above methods or technologies involves quantitative evaluation of pore-throat producing law in the secondary migration of oil and gas.

Method used

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  • A method for quantitative evaluation of pore-throat producing law in the secondary migration of oil and gas
  • A method for quantitative evaluation of pore-throat producing law in the secondary migration of oil and gas
  • A method for quantitative evaluation of pore-throat producing law in the secondary migration of oil and gas

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Embodiment 1

[0030] A method for quantitatively evaluating the law of pore-throat production during secondary migration of oil and gas, comprising the following steps:

[0031] Step 1. Core selection and processing: A core column with a diameter of 2.5 cm and a length of 6.1 cm is drilled from the full-diameter core, washed with oil and dried, and the gas permeability of the core is 0.11×10 -3 μm 2 ;

[0032] Step 2. Preparation of working fluid: According to the water quality monitoring data of oilfield produced formation water, the water type is prepared as CaCl 2 , the salinity is the simulation formation water of 40526mg / L, according to the viscosity of the crude oil in the oil field, use kerosene and formation crude oil according to the ratio of volume 3:1 to prepare the experimental simulation oil with a viscosity of 2.4mPa.s;

[0033] Step 3: vacuumize and saturate the simulated formation water, calculate the core porosity to be 10.1%, and the pore volume to be 2.97ml;

[0034] S...

Embodiment 2

[0042] A method for quantitatively evaluating the law of pore-throat production during secondary migration of oil and gas, comprising the following steps:

[0043] Step 1. Core selection and processing: A core column with a diameter of 2.5 cm and a length of 5.95 cm is drilled from the full-diameter core, washed with oil and dried, and the gas permeability of the core is 0.35×10 -3 μm 2 ;

[0044] Step 2. Preparation of working fluid: According to the water quality monitoring data of oilfield produced formation water, the water type is prepared as CaCl 2, the salinity is the simulation formation water of 40526mg / L, according to the viscosity of the crude oil in the oil field, use kerosene and formation crude oil according to the ratio of volume 3:1 to prepare the experimental simulation oil with a viscosity of 2.4mPa.s;

[0045] Step 3: vacuumize and saturate the simulated formation water, calculate the core porosity to be 12.1%, and the pore volume to be 3.26ml;

[0046] S...

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Abstract

The invention discloses a method for quantitative evaluation on a pore throat usage law in an oil and gas secondary migration process. The method comprises the following steps of: 1, selecting and processing a core; 2, preparing a working solution; 3, vacuumizing saturated simulated formation water, and calculating core porosity and pore volume; 4, fully replacing the simulated formation water; 5, measuring a nuclear magnetic resonance spectrum T2; 6, increasing injection volume multiple A of simulated oil, until that oil content at a model outlet reaches 100%; 7, drawing the nuclear magnetic resonance spectrums T2 measured under different injection volume multiples on a graph to get the variation of the oil content; 8, conversing the nuclear magnetic resonance spectrums T2 measured under different injection volume multiples into pore throat radius, and drawing a pore throat distribution curve; and 9, performing quantitative comparison to get the usable pore throat range and variation law of the oil content in the oil and gas secondary migration process. The method can be used for quantitatively and accurately evaluating the pore throat usage law in the secondary migration process.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploration and testing, in particular to a method for quantitatively evaluating the law of pore throat production during the secondary migration of oil and gas. Background technique [0002] The secondary migration of oil and gas is the process of oil and gas entering the reservoir to displace formation water, and the whole process is completed in the complex pore structure, which is an important geological condition that determines fluid flow and oil and gas migration and accumulation in microscopic pore throats. The filling process and filling degree of oil and gas in the secondary migration process are controlled by the production law of pore throats. Quantitative evaluation of the production law of pore throats in the process of secondary migration of oil and gas is of great significance for enriching the theory of oil and gas accumulation and effectively guiding oil and gas exploration. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N24/08
CPCY02A90/30
Inventor 高辉赵金省张明
Owner XI'AN PETROLEUM UNIVERSITY
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