The following problems stood out in the deliverability tests and analysis of gas wells with high temperature and high pressure（HTHP） in South China Sea. Firstly

it was unable to accurately calculate the variable mechanical skin factors

resulting in the negative slope of deliverability equation

bringing about inaccurate calculation of the absolute open flow of HTHP gas wells. One new simulation technique

mainly consisting of variable skin analysis and productivity numerical simulation

for HTHP gas wells was proposed

and then the real damage could be evaluated accurately. In addition

the absolute open flow of HTHP gas wells was calculated based on flowing pressure and rates data in deliverability test simulation

eliminating the negative slope of deliverability equation. This simulation technique had been applied successfully well-X1 of HTHP gas reservoir in South China Sea

providing guidance for gas field production.