Pipette tips are consumables commonly used in chemistry,biology,medicine to transport a measured volume of liquid.It has many types and specifications,transparent or black,with or without filter,max volume can be from 10ul to 1250ul. We produce the pipette tips in 100,000 grade cleaning room.So the tips we have are DNAse, RNAse free and sterilized.
Filter Pipette Tips,Non Filtered Pipette Tips,Pipette Tip Box,Low Retention Pipette Tips,Sterile Pipette Tips Yong Yue Medical Technology(Kunshan) Co.,Ltd , https://www.yymeds.com
Single-screw pump multi-phase mixed transmission of oil and gas and its process analysis (1)
In oil exploration, oil wells are often accompanied by a certain amount of natural gas, water and solid particles. In order to reduce the well head back pressure, increase the crude oil output, improve the development benefit and achieve the objective of oil and gas confinement transportation, multi-phase mixed media such as oil and gas must be pressurized and transported with multiphase oil-gas pump. Single-screw pump can transport gas-liquid-solid multiphase medium, and can deliver pure gas medium in a short time, to achieve multiphase mixed transport. In the design of hybrid transmission system, the characteristics of mixed transmission medium and single-screw hybrid pump are fully analyzed to ensure the system is safe, reliable and scientific. Single screw oil and gas mixing pump working principle and characteristics Single screw pump work is the same outer surface of the rotor in the corresponding inner surface of the stator within the mesh to form a special contact line to separate the stator cavity, . When the rotor rotates according to a certain track, the seal line moves axially, and the stator cavity also moves axially, that is, displacement of the volume. At this moment, the seal line disappears at one end and a new seal line is generated at the other end, Push the media from one end to the other. Single-screw oil and gas pump due to the use of a good elastic rubber material of the stator, the rotor meshing with the need for a certain amount of interference, so that it produces a reliable seal. When the pump is working, the sealing line can effectively prevent the gas from passing, so as to achieve the purpose of conveying the gas. When the medium contains solid particles, if the solid particles are squeezed in the sealing line, the surface of the stator rubber is compressed due to the elastic effect of the rubber stator, The particles cross the seal line and the stator rubber rebounds back to its original shape so that the single screw pump can achieve the purpose of containing a trace amount of solid particles in the transport medium. Single-screw oil and gas mixing pump is suitable for corrosive media, gas-bearing media, sediment-containing solid particulate media and high-viscosity media. Gas content up to 95%, medium viscosity up to 50000mPa · S, with a solid content of up to 60%, allowing the solid particle diameter ≤ 3.5 ~ 32mm, flow and speed is proportional to the low speed low flow to maintain pressure stability, Has a good regulatory performance, easy to achieve automation and control. Oil and gas ratio and moisture content Oil and gas multiphase transport medium is mainly composed of liquid, gaseous, solid components such as crude oil, natural gas and water, solid particles. In the development of oilfields, the indicators of oil and gas production that measure the production of oil wells are oil and gas ratio, moisture content and solid content. The oil-gas ratio and moisture content of different oil wells are different and vary greatly. Oil-gas ratio refers to the ratio of gas volume to crude oil volume of a hydrocarbon medium at standard atmospheric pressure. Gas under different pressures and temperatures, according to the gas equation to change its state; when not considering the temperature changes on the state changes, the gas volume changes inversely proportional to pressure changes. At the same time the pressure rises, some of the gas will be liquefied, whereas the liquefied gas will be gasified; and as its pressure changes, the amount of gas dissolved in the liquid will also change. When the oil and gas are mixed and transported, the pressure in the sucked-in pipe of the pump suction chamber is usually higher than the atmospheric pressure, and the gas in the medium has been compressed. At this moment, the medium-gas ratio at a specific gas pressure can no longer reflect the actual operation state of the pump . Moisture content refers to the mass percentage of anti-referring to water, nor does it reflect the actual operating status of the pump. In order to reflect the mixed liquid into the pump, gas ratio, I introduced the concept of liquid into the rate.