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At the end of the 20th century, the experimental test science and technology workers of Wuxi Institute of Geology developed a new generation of ultra-high pressure pressure based on the current domestic situation and the use of modern science and technology, based on the fact that the imported mercury intrusion meter is expensive, inconvenient to maintain, and the analysis results are obviously insufficient. Mercury instrument WX-2000 pore structure instrument, and self-improvement, make it more suitable for the latest ST-2000 type surface area and pore size analyzer. On the basis of instrument development and instrument renewal, the Institute's scientific and technological workers select representative lithologies and rock samples. By simulating the formation conditions, the breakthrough pressure is directly measured by the saturated water of the gas-driven rock sample, and then combined with the same rock. The capillary pressure curve and its pore size distribution map obtained by the full analysis of the micropore structure are used to find the general rule of determining the breakthrough pressure. The experimental results prove that this method is more reasonable and more realistic.
The study of reservoir caprock is an indispensable important work in today's oil and gas geology research, and the micropore structure analysis of cap rock samples is the main method for cap rock research and evaluation. At present, the determination methods of rock micropore structure at home and abroad are mainly mercury intrusion method and gas adsorption method.
The microporous structure of rock is determined by mercury intrusion method. The imported mercury intrusion meter has higher working pressure and smaller measurable porosity. However, for natural gas capping, the analysis result is not satisfactory. There is also a certain gap in the full analysis of the microporous structure of the rock sample; the domestic mercury intrusion meter is not satisfactory because of the low working pressure. Years of practice have shown that no matter whether it is a single mercury intrusion method or a gas adsorption method, the full analysis of the micropores of the cap rock samples cannot be completed.
With the in-depth development of natural gas exploration, the research and evaluation of caprocks are becoming more and more important. In order to further improve the existing testing equipment and testing technology level, Wuxi Petroleum Geology Research Institute began to study the caprock of natural gas reservoirs as early as 1984. Starting from the analysis of the micro-pore structure of rock samples, a method for determining the micro-pore structure of cap rock samples by gas adsorption method was established. In 1990, a joint measurement method using mercury intrusion method and gas adsorption method was established. To make up for the lack of measurement of domestic instruments.
This new generation of WX-2000 pore structure instrument has three distinct characteristics compared with similar instruments at home and abroad:
1 Specially designed capacitance volume measuring instrument, the actual working pressure can reach 200 MPa, the mercury volume measurement range is 0-6 ml, the mercury volume change resolution is less than 1 microliter, the measurement process can be carried out continuously, and the test result can provide complete progress. Capillary pressure curve of mercury or mercury, thus overcoming the pressure of mercury in the inlet mercury intrusion meter, the negative pressure and the positive pressure must be separated, the vacuum decompression negative pressure can not be measured, the complete capillary pressure curve and the mercury consumption are not obtained. a large amount of shortcomings;
2 Specially designed vacuum-purified isobaric mercury filling system, in the process of filling the core chamber with mercury, the static pressure at the upper end of the core chamber can be controlled more accurately than 10 mmHg, and the static pressure can be guaranteed. The same, thereby improving the measurement accuracy of the maximum pores, and also functioning as a vacuum to purify mercury, making the mercury entering the core chamber and the measurement system cleaner;
3Specially designed mercury volume measurement system, the measurement process is not affected by any gap between the valve stem and the seal of the valve, thus improving the stability of the blank value of the mercury volume measurement system.
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