Research and Field Application of ultra-high temperature and high pressure gas wells test in the northern slope of Tazhong

Abstract

The Shunnan block located on the northern slope of Kathake uplift on the footwall of the Tazhong No. 1 fault zone in the central uplift zone of the Tarim Basin is featured by ultra-large burial depth, which results in the formation pressure of higher than 140 MPa, the formation temperature of higher than 200°C, the serious leakage of large density mud and the extremely-high difficulty in test. Through continuous innovation and exploration of processes and technologies, and continuous summing up of experiences, a complete set of test technologies for the three ultra-wells in the Shunnan block have been formed and successfully applied in the test of well NS7 that has the most adverse working conditions, which provides a certain reference significance for the test of similar three ultra-wells.