Study on differences of gas well test and production test of volcanic gas reservoir
Kelameili gas field is the first packaged gas field with developed reserves of more than 100 billion cubic meters in Xinjiang Oilfield.According to the geological features of strong heterogeneity,low porosity and low permeability,and complex water-gas relationship,and the large difference of dynamic characteristics,the effect factors on gas well deliverability were evaluated,based on the well test and production test data of 15 gas wells.The differences of gas well test and production test of volcanic gas reservoir were systematically analyzed based on the characteristics of gas well test and production test.It was believed that the initial deliverability of volcanic gas wells had little relation with rate maintenance capability.The open flow capacity of production test is strongly related to the formation flow capacity,so it is better to predict the gas deliverability,and production test data should be fully used during gas production allocation and plan adjustment.For fractured wells,the deliverability equation by gas well test is greatly different from production test data,and the main reason is the significant decrease of the conductivity with time,so the deliverability prediction need consider the crack effect.