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Experiment device and method for simulating hole diameter variations in tight oil depletion development process

A technology of oil depletion and production process, applied in the direction of nuclear magnetic resonance analysis, etc., can solve the problems of accuracy of test results, insufficient representativeness, inability to consider the influence of ground stress difference, and inability to simulate the physical process of tight oil, etc., to achieve Improve the production level and oil yield, strong representativeness, and strong operability

Active Publication Date: 2017-03-22
INST OF MECHANICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the rock was not restored to the original reservoir stress and pore fluid pressure before the conventional laboratory test, and the influence of the in-situ stress difference on the pore diameter change could not be considered, so the accuracy and representativeness of the test results were not strong enough
It can be seen that relying on the analysis method of changing the confining pressure and testing the change of permeability, it is no longer possible to simulate the physical process of tight oil depletion production.

Method used

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  • Experiment device and method for simulating hole diameter variations in tight oil depletion development process
  • Experiment device and method for simulating hole diameter variations in tight oil depletion development process
  • Experiment device and method for simulating hole diameter variations in tight oil depletion development process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Embodiment 1: see figure 1 A device for simulating the change state of core pore diameter in the process of tight oil depletion production, which includes: a core pressure loading unit (1), a core holder (2), a core data acquisition unit (3), a nuclear magnetic resonance instrument (4 );

[0048] The core pressure loading unit (1) is used to simulate the pressure carried by the core in the process of tight oil depletion production, including: ISCO pump (11), left working fluid piston container (12), right back pressure valve (13) , confining pressure valve (14); the ISCO pump (11) is used to push the piston in the left working fluid piston container (12) with a pressure below 40MPa; the left working fluid piston container (12) is used for Pumping neutral kerosene to apply a displacement pressure below 40MPa to the core through the inner tube of the core holder to tighten the plug (23) to the left; the right back pressure valve (13) is used to tighten The inner tube of...

Embodiment 2

[0052] Example 2: see figure 2 A method for measuring the change state of the core pore diameter in the process of tight oil depletion production, which uses the above-mentioned device for simulating the change state of the core pore diameter in the process of tight oil depletion production, and includes the following steps:

[0053] A. Determine reservoir core pore fluid pressure, overlying strata stress and horizontal ground stress;

[0054] Suppose: the formation water density is ρ w , the reservoir depth is h, the gravitational acceleration is g, and the formation density is ρ s , the tectonic stress is σ s , the rock Poisson's ratio is v;

[0055] but:

[0056] The pore fluid pressure Pp is:

[0057] P p = ρ w gh

[0058] Overburden pressure σv is:

[0059]

[0060] The horizontal stress σh is:

[0061] σ h =vσ v +σ s

[0062] B. Measure the radial deformation of the rubber tube;

[0063] Put a 2.5cm solid cylindrical steel fake core into the rubber tub...

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Abstract

The invention discloses a device and method for simulating the hole diameter variation state of a rock core in a tight oil depletion development process. The device comprises a rock core pressure loading unit (1), a rock core holder (2), a rock core data acquisition unit (3) and a nuclear magnetic resonance apparatus (4). According to the invention, by putting the tight oil rock core under the original triaxial stress condition, hole diameter variations caused by changing an effective stress are evaluated jointly on the basis of the nuclear magnetic resonance apparatus and a radial displacement sensor, thereby realizing hole diameter variation measurement based on combined result analysis of a radial displacement test and a nuclear magnetic resonance test; the device and method have the characteristics of high measurement accuracy, strong representativeness, strong operability and the like, and are suitable for popularization and application; and the device and method have important practical meanings for improving the tight oil depletion development level and the oil extraction rate.

Description

technical field [0001] The invention belongs to the technical field of petroleum development, in particular to an experimental device and method for simulating the change of pore diameter in the process of tight oil depletion exploitation. Background technique [0002] Tight oil is an important oil and gas resource in my country. During the production of tight oil, with the production of fluid inside the reservoir, the pore pressure decreases, resulting in an increase in the effective stress of the rock, causing changes in pore structure and pore volume, and pore volume fluctuations. These changes directly reduce the seepage of tight oil in the reservoir, causing the production of tight oil wells to decline rapidly after being put into production, and the production can decrease to about 2 / 3 after one year. The traditional method to analyze the change of rock pore diameter caused by stress is to carry out stress sensitivity experiment according to SY / T 5358-2010 industry stan...

Claims

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Application Information

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IPC IPC(8): G01N24/08
CPCG01N24/08
Inventor 杨柳张旭辉赵京鲁晓兵刘海娇刘庆杰张祖波贾宁洪
Owner INST OF MECHANICS - CHINESE ACAD OF SCI
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