ABSTRACT
In view of the problems of long shut-in time, high test cost, and influence on productivity in conventional well test construction in Linxing gas field, the variable production well test method is introduced, and the technology is perfected and improved according to the actual situation of a gas field. This time, taking downhole conventional pressure recovery as the standard, wellhead pressure measurement, and downhole pressure measurement are carried out simultaneously to verify the reliability of the variable production well test. The field test has achieved good results, and the interpretation results of downhole and wellhead pressure measurements are consistent. Through error analysis, the average error of formation pressure and main formation parameters is less than 5%, and the maximum error is less than 10%; conventional shut-in pressure recovery test shortens the well test period by 5 ~ 10 days, which provides a reliable basis for the adjustment of the development scheme. In the later period, wellhead pressure measurement and variable production well testing can be popularized for this kind of gas wells without liquid accumulation.
