Magnetic resonance imaging testing device for online imbibition experiment and experiment method

Abstract

The invention discloses a magnetic resonance imaging testing device for an online imbibition experiment and an experiment method. The device comprises a constant voltage maintaining system, a porous medium system and a low field magnetic resonance imaging analyzer. The constant voltage maintaining system comprises a constant voltage and constant speed pump, the front end of the constant voltage and constant speed pump is connected with a first water containing device, the rear end of the constant voltage and constant speed pump is arranged above a second water containing device, the bottom ofthe second water containing device is connected with an inlet of the porous medium system, an outlet is connected with a precision balance, the porous medium system is placed into a magnetic field generated by the low field magnetic resonance imaging analyzer, the porous medium system comprises an organic glass tube, a rock core sheet, a steel wire net and a weak magnetism metal sealing piece arearranged at the front end of the organic glass tube, and the rear end of the organic glass tube is provided with a steel wire net and a weak magnetism metal sealing piece; the invention further provides an online imbibition experiment method. The requirement for online imbibition experiment testing is met, the device is simple in structure, easy and convenient to operate and low in nuclear magnetism signal interference, the testing result obtained by the method is accurate, the experiment error is small, and repeated experiments can be performed.

Description

technical field [0001] The invention belongs to the technical field of oil and gas reservoir development, and in particular relates to an on-line imbibition experimental nuclear magnetic resonance testing device and an experimental method. Background technique [0002] Oil, gas and water are rich in hydrogen nuclei. Therefore, in the petroleum industry, the most commonly used characteristic of nuclear magnetic resonance is hydrogen nuclei. The hydrogen nuclei themselves keep rotating. Under the action of a specific external magnetic field, these hydrogen nuclei will interact with the magnetic field There is a strong interaction between them, which is manifested as an NMR signal externally. When the porous medium is only saturated with one kind of fluid, the NMR T2 spectrum can reflect the distribution of pores, and the NMR T2 spectrum can be used to study the occurrence state of the fluid in the rock sample, and to analyze the movable fluid and movable oil in the rock sample...

AI Technical Summary

Problems solved by technology

Since nuclear magnetic resonance equipment is very sensitive to environmental variables, this test method is likely to cause large experimental errors, thereby affecting the accuracy of nuclear magnetic resonance results

At present, scholars at home and abroad have developed some online NMR measurement experimental devices. However, due to the high precision requirements of the imbibition experiment, the existing devices cannot meet the online test requirements of the imbibition experimental mechanism research, and have complex structures, difficult operation and NMR. Therefore, it is necessary to develop a nuclear magnetic resonance testing device system and experimental method for on-line imbibition experiments with simple operation and low signal interference.

Images