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Device and method for measuring minimum miscible pressure of oil gas by comprehensive NMR and CT scanning

A miscible pressure, CT scanning technology, applied in the direction of measuring devices, measuring fluid pressure, instruments, etc., can solve the problems of lack of standard experimental procedures and miscible standards, narrow application range, and poor repeatability of measuring miscible pressure. Dynamic visual analysis, the effect of high experimental precision

Inactive Publication Date: 2019-09-20
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

The disadvantage is that the repeatability of the determination of miscible pressure is not strong, the lack of standard experimental procedures and miscible standards, and the narrow application range, only used in some small areas
In 1998, foreign researchers such as Rao proposed the interface disappearance method to measure the minimum miscible pressure. This method is fast and simple (it takes 4-6 hours to measure a minimum miscible pressure), but this method requires high precision of experimental instruments and cannot be widely used. Applications

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  • Device and method for measuring minimum miscible pressure of oil gas by comprehensive NMR and CT scanning

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Embodiment Construction

[0031] Describe the specific embodiment of the present invention in detail below in conjunction with technical scheme and accompanying drawing:

[0032]As shown in the attached figure, the device for measuring the minimum miscible pressure of oil and gas by integrated NMR and CT scanning technology mainly includes a nuclear magnetic resonance imaging system, a CT scanning system and an oil and gas miscible system.

[0033] The method for measuring the minimum miscible pressure of oil and gas with the integrated NMR and CT scanning technology includes the following steps:

[0034] The first step is preparation.

[0035] (1): Connect the experimental pipeline. Before the formal experiment starts, use nitrogen to test the pressure and leak of the entire experimental device, maintain the pressure of 6000kPa for 12 hours, and monitor through the pressure collection data. If the pressure is within this period If there is no drop or the drop is within ±10kPa, it is considered that t...

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Abstract

The invention provides a device and a method for measuring the minimum miscible pressure of oil gas by comprehensive NMR and CT scanning, and simultaneously adopts a nuclear magnetic resonance imager and a CT scanner to measure the minimum miscible pressure of oil gas at different temperatures, thereby achieving the visualization of the transfer process of substances mutually dissolved by oil gas, revealing the equilibrium law of oil gas phase, and comprehensively considering the measurement results of the nuclear magnetic resonance imager and the CT scanner, so that the experimental precision is higher; and moreover, the measuring method can visually and nondestructively measure the minimum miscible pressure of the oil gas, has operability and repeatability, and can accurately and quickly measure the minimum miscible pressure of the oil gas.

Description

technical field [0001] The invention discloses a device and method for measuring the minimum miscible pressure of oil and gas by comprehensive NMR and CT scanning, belonging to the technical field of petroleum engineering. Background technique [0002] The minimum miscible pressure is the minimum pressure at which oil and gas are miscible into a single phase at a certain temperature. The minimum miscible pressure of oil and gas can be measured accurately and quickly. For gas injection (CO 2 , Light hydrocarbons, etc.) Engineering research on enhanced oil recovery, miscible and immiscible displacement evaluation, economical design of oil recovery, and effective storage of greenhouse gases has important guiding significance. On the basis of conventional technology, the oil recovery rate can be further increased by 10%-15% through gas flooding technology. 2 It is necessary to provide basic physical property data for the analysis of underground multi-phase and multi-component m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N13/00G01N24/08G01N23/046G01L11/00
CPCG01N13/00G01N24/08G01N23/046G01L11/00
Inventor 卞小强吴畅
Owner SOUTHWEST PETROLEUM UNIV
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