The invention belongs to the field of development of oil and gas wells, and relates to a
wellhead sampling device, in particular to a
wellhead sampler designed for the characteristic of gas field environment containing high content of H2S / CO2, and a sampling
system thereof. The sampling device comprises a
sampling valve, a sampling
bottle and a pressure reducing valve, wherein two ends of the sampling
bottle are in threaded connection with the
sampling valve; the
external connection of the
sampling valve is external-thread clamping sleeve type connection; the pressure reducing valve is used for carrying out
pressure reduction and sample injection on high-pressure gas in the sampling
bottle; the pressure reducing valve comprises an outer conveying sample
injection port which is connected with an outer
detector; and the outer conveying sample
injection port is a clamping sleeve type connection port so as to eliminate dead angles of pipelines. In the invention, the field sampling for analysis is achieved, the result of experimental analysis has good consistency, the device is safe and reliable, and the
corrosion resistance to H2S / CO2 is strong. In the gas field sampler disclosed by the invention, the sampling process is
safer, the experimental process is more precise and faster, the applicable
pressure range is wider, and more safety is achieved.