Oil shale reservoir pore test - Database & Sql Blog Articles

With the development of science and technology, the detection and monitoring of various gases, especially flammable gases and toxic gases, has become an urgent problem to be solved in the fields of industry, civil, national defense and transportation. The research of nano gas sensing materials plays an irreplaceable role in improving the sensitivity, selectivity and long-term stability of gas sensing materials, as well as how to reduce the working temperature and shorten the corresponding temperature and time.

At present, the detection of various gases at home and abroad is mainly for hydrogen, hydrogen sulfide, hydrocarbons, nitrogen oxides, ammonia, ethanol, liquefied petroleum gas (LPG), pipeline gas and other reducing gases and toxic gases. The more widely used gas sensing materials are mainly metal oxides such as SnO2, ZnO, SiO2, TiO2, Fe2O3, and WO3, and the composite oxide is also widely used as a solid electrolyte. Since conventional gas sensors such as SnO2 have high power consumption, low sensitivity, and poor selectivity, people have been trying to explore new methods to solve these problems.

Due to the small size of the nanocrystals, the electron energy levels near the Fermi level of the metal change from quasi-continuous to discrete energy levels, and the energy gap becomes wider. The special quantum size effect, surface effect and small size effect make nanomaterials Special properties not found in many bulk materials. Gas-sensitive materials such as nano-SnO2 have large specific surface and high activity and sensitivity. Their components have long life, high sensitivity and low cost, and have been at the center of metal oxide semiconductor resistive gas sensor research. In research and application, it is found that the purity and grain size of gas-sensitive materials such as SnO2 directly affect the gas-sensing properties of the materials. The particle shape, uniformity and stability of SnO2 powders directly affect the gas produced in the future. Important parameters such as sensitivity, power consumption, selectivity, response recovery characteristics and stability of the sensitive components.

Since the gas sensing mechanism of gas sensing materials such as tin oxide is surface controlled, the sensitivity of the gas is related to the specific surface area of ​​the material. Generally, the larger the specific surface area, the higher the gas sensitivity. The specific surface area is the surface area per gram of solid material in m2/g; the national standard for specific surface area testers is the BET multi-point method based on BET theory (GB/T 19587-2004). The main point of the specific surface area measured by the nitrogen adsorption BET multi-point method is: in the range of 5-30% nitrogen partial pressure, the adsorption amount of the adsorbent (the powder to be tested) to nitrogen is measured at different partial pressure points of nitrogen, and adsorption is made. The isotherm, the specific surface area of ​​the adsorbent can be calculated by the BET formula to determine the saturated adsorption amount of the monolayer when the surface of the adsorbent is covered with nitrogen molecules to cover the monolayer.

The 3H-2000BET-A specific surface area measuring instrument of Bestech Instrument Technology (Beijing) Co., Ltd. is a high-precision analytical instrument based on the national specific surface test standard. It has many domestic leading technologies; The purging process function requires a purge process between different nitrogen partial pressure points of the chromatographic specific surface test, which makes the purging process between different nitrogen partial pressure points more convenient and efficient, and reduces the accuracy of continuous testing. Impact; the only program-controlled wind-heat assisting device in China, which guarantees sharp and rapid desorption peak and reduces background error after full automation; the only chromatographic concentration detection system in China makes the nitrogen partial pressure detection accuracy increase relative to the flow method 10 times; six-way valve injector program control, the only domestic quantitative tube program-controlled switching function; the only domestic particle size report and other functions; the instrument parameter software display, at the same time, the large-screen LCD hardware display on the instrument, so that the instrument working state parameters At a glance, the operation is more reliable; and liquid nitrogen temperature monitoring, detector gas shutoff protection, detector thermostat, heavy The sound prompt of the link makes the 3H-2000BET-A surface surface instrument achieve and surpass the performance of similar instruments in foreign countries in terms of test accuracy, stability and safety, and ease of operation. The 3H-2000 series surface surface meter has a large number of customers in China. A well-known brand than the surface sensor.

The Besderby surface meter adopts fully automatic operation, is easy to learn, stable in instrument performance, accurate and fast in testing. It is deeply loved and praised by teachers, researchers and technicians in universities. It can also provide free samples for customers and the number of samples. More than 10,000 times, the experience of testing various materials has broken the monopoly of foreign surface meters, established our excellent national brand, and the products are affordable, and can be widely popularized and promoted. In recent years, shale gas has gradually been regarded as a non-conventional natural gas resource with great potential. It is one of the most concerned types of energy at present. At present, large-scale exploration and test mining development has been carried out in many places in China.

In March 2012, the four ministries and commissions jointly issued the “12th Five-Year” development plan for shale gas and proposed that the annual output of shale gas in China will reach 6.5 billion cubic meters in 2015, and the annual output will reach 60 billion to 100 billion cubic meters by 2020. Meter.

Oil shale is a special kind of reservoir, which is quite different from ordinary reservoirs. It is generally of ultra-low porosity and low permeability type. The pore structure of oil shale reservoirs is relatively complex, the pore diameter is small, nano-scale pores are generally developed, and a large amount of shale gas is stored in oil shale in an adsorbed state. The presence of nanoscale pores in oil shale makes it important to study the flow of gases in these pores and the governing equations. Nano-oil and gas is an important direction of future geological innovation. Nano-oil and gas are mainly distributed in source rock formations and near-source tight reservoirs in close contact with them, covering shale oil, shale gas, coalbed methane, tight sandstone oil, Tight sandstone gas, tight limestone oil, etc., the pore throat diameter of the reservoir is generally nanometer. The nanopores of oil shale determine that its specific surface area is very large, about 200m2/g. These micropores and cracks are the storage space for oil and gas.

Studying and testing the important data such as porosity, pore size distribution and specific surface area of ​​oil shale is of great significance for studying the gas content of oil shale, the occurrence of natural gas and determining whether it has industrial exploration and development value. The 3H-2000PS series automatic surface and aperture analyzer independently developed by Bethes Instrument Technology adopts the static volumetric measurement principle. It has a number of technical patents, and specially designed the sample tube for core testing. The only independent P0 test in China. The instrument is widely used in many research institutes and enterprises including China University of Petroleum, Shanghai University, Beijing Institute of Technology, and Central South University. It is highly praised by customers. 3H-2000PS1 fully automatic surface and aperture The analyzer has high cost performance, high precision and high test efficiency. It is a professional instrument for testing core pore size, pore size distribution and specific surface area. It is very suitable for shale gas, oil rock gas, mud shale, sandstone oil and sandstone gas. The use of scientific research institutions and enterprises such as limestone oil and coal-rock gas has important value for predicting shale gas reservoir reserves.