In the process of the natural gas flowing from the well head to the treatment plant

some condensate water may be pro-duced and the transport efficiency declines due to the constant changes of the temperature and the pressure. The gathering stationsof the Zizhou gas field adopt the technological process of the single station with the separated water and gas at the room temperature

the moisture vapor transport

and the hydrocarbon and dehydration took off together in th

e treatment plant. The separation of the wa-ter and gas at the room temperature need to determine where the condensate is by analyzing the water dew point

and ensure the rea-sonable running temperature under the different working conditions

so as to improve the separation efficiency of the gas station. Bythewater dew point tester developed independently

the water dew point test was carried out under different pressure of the naturalgas from the gas gathering stations in Zizhou gas field

that is

Zhou-1 station

Zhou-4 station and Zhou-8 station

and the index pre-diction model of the water dew point and pressure was established

and then

the equation of the water dew point and water contentwas established. The calculation results of Zhou-4 station show that the condensate water of this station mainly appears in the pipe-lines which connect the outside to the inside of the station in summer. The daily production of the condensate water is about 8 m

3

.While in winter

the condensate water appears within the gas gathering stations and the amount of which appears in the pipelines isless than that in summer

but still exists. The pressure drop and the discharge volume changed with the date show that this calcula-tion is more reliable. The daily water production of the gathering station by the water dew point under the pressure provide the effec-tive measures for the pigging in field and reduce the running resistance of the pipeline.