Research and application of testing ground control technology optimization in ultra-deep sour gas well in chuandongbei area

Ultra-deep marine facies carbonatite reservoir is characteristic of high temperature,high pressure and sulfur coated etc. in Sichuan Northeast area,the safety and success ratio of testing face great challenge. On the basis of testing difficulty analysis in carbonatite sour reservoir in Sichuan Northeast area,and in order to improve the safety of testing,the testing ground control technology was optimized. Through wellhead assembly and surface operation regulation optimization,the wellhead assembly suited for Yuanba,Puguang and Tongnanba area was determined and 3 ground control operation regulations suited for sour gas well in different operation condition were designed. Finally,the testing technology suited for ultra-deep sour gas well in Sichuan Northeast area was formed. It provided the safety guarantee for testing sour reservoir in Sichuan Northeast area.