Coal Gas Field Ground Transport Technology

At present, China’s shortage of resources, natural gas production has been unable to meet the growing demand, and the gas composition and calorific value of similar coal seam gas resources rich, large reserves, has become the preferred alternative to natural gas. The coal-bed gas with low pressure, low permeability and low "three low characteristics and exploitation of coal bed methane area usually mountainous terrain, elevation, such as dispersion pressure, gas gathering station continues to follow the traditional mode, will not be able to reduce the engineering cost, shorten the construction time, reduce the area and save operation cost. Therefore, to independent research and development of a suitable for coalbed gas environment of China new technology to guide the "low pressure, low permeability, low coal seam gas field surface construction engineering".At present, the traditional gathering technology, developed a new set of ground transportation technology, to shorten the construction period, reduce the cost of investment, saving land and coal seam gas field scale, benefit and development. Through field investigation of domestic gas analysis technology in detail, to stick to the ground building and underground mining to the principle of combining, contrast and transportation technology of bold innovation, research on CBM ground set, developed a set of suitable for coalbed methane in China advanced, economic applicable "multiple access, flexible set" coal seam gas gathering technique. This technology breaks through the traditional distribution mode, from someone on duty to the gathering station metering station, changed to unattended valve group through a plurality of gas gathering line and gas gathering trunk node, coal seam gas pipeline connecting the wellhead through this node in centralized to the gas gathering trunk lost to the gathering station. The new technique eliminates a plurality of measurement need someone on duty station, simplify the process, reduce the labor cost, the most important thing is the breakthrough point is to improve the fluid flow environment. Broke more than 5km for gas pipeline length should not be in the specification limits, the gas pipeline extension to 20km or more, than the standard limit the length of more than 3 times, through the actual operation can reduce engineering investment, reduce energy requirements.