Nuclear magnetic resonance system and method for simulating high-temperature and high-pressure conditions

Abstract

The invention provides a nuclear magnetic resonance system and method for simulating high-temperature and high-pressure conditions. The system comprises a methane gas cylinder, a helium gas cylinder,a vacuum pump, a pressurization system, an oil storage bin, a high-temperature and high-pressure nuclear magnetic clamper, a low-field nuclear magnetic instrument, a control acquisition system and anexhaust system, according to the system, a rock sample to be measured is placed in a holder, fluorine oil in a heating oil storage bin is matched with a pressurizing system to apply confining pressureand high temperature to simulate a high-temperature and high-pressure environment to the holder, and a methane gas cylinder is matched with the pressurizing system to apply gas pressure to the holderto simulate a gas environment in a stratum; a low-field nuclear magnetic instrument is adopted to measure spectral information of a rock sample and store the spectral information in a control acquisition system. The method comprises the steps of standard plunger rock sample preparation and pretreatment, instrument calibration, device rock sample, confining pressure application, air tightness detection and vacuumizing treatment, original sample measurement, displacement experiment and variable gas pressure displacement experiment. The high-temperature and high-pressure environment and gas displacement of a real stratum can be simulated, and the credibility of a nuclear magnetic result is improved.

Description

technical field [0001] The invention relates to the field of petroleum exploration and development, in particular to a nuclear magnetic resonance system and method for simulating high temperature and high pressure conditions. Background technique [0002] It has become an indispensable research method in petroleum exploration and other fields to measure the parameters such as porosity and permeability of cores by obtaining cores from strata for core physical property analysis experiments. Different from techniques such as mercury injection experiments, which will damage the core, low-field NMR technology is favored by many researchers because of its harmlessness to the core, fast and efficient characteristics. Nuclear magnetic resonance technology is a modern technology that uses the energy changes of atomic nuclei in a magnetic field to obtain nuclear information. It is the only geophysical method that can directly distinguish bound and movable fluids (water and oil) in roc...

AI Technical Summary

Problems solved by technology

[0003] After a lot of research, it was found that most of the existing NMR instruments are suitable for pressures lower than 30MPa and temperatures lower than 100°C. However, with the development of drilling and production technology, the well depth gradually increases, and the downhole methane pressure and confining pressure gradually increase. , leading to the inability of traditional nuclear magnetic resonance instruments to be applied to the corresponding formation pressure and temperature conditions. Therefore, it is urgent to propose a nuclear magnetic resonance system and method for simulating high-temperature and high-pressure conditions. By simulating the high-temperature and high-pressure environment of the formation, further research The working state of the NMR instrument

Images