ANALYSES AND TREATING OF GAS OVERFLOW IN CHU 29 WELL

In lots treating gas overflow, which caused by gas column invading borehole,the well control is based on calculating bottom hole pressure through shutting well. But in deep well drilling practices of long open hole,the homogeneous gns generally invades borehole. Because open hole section can’t support high pressure or well control equipment damage because not running intermediate casing strings or intermediate casing strings running too shalow, that made gas invading and lost circulation append concurrently and cannot shut well to determine pore pressure and control well with choke. This paper describes the treating process of gas overflow in Chu 29 well and analysised the problems discussed above,pressenting the measurement and technique to control gas overflow.