Shandong Science ›› 2022, Vol. 35 ›› Issue (4): 77-83.doi: 10.3976/j.issn.1002-4026.2022.04.010

• Energy and Power • Previous Articles     Next Articles

Increasing the velocity of annular gas in deepwater drilling

WANG Xiao-hui(), JIANG Hai-jun   

  1. Strategic Planning Institute,SINOPEC Research Institute of Petroleum Science, Beijing 100101, China
  • Received:2021-09-08 Online:2022-08-20 Published:2022-07-25

Abstract:

In the process of deepwater drilling, early and accurate monitoring of gas invasion is crucial for drilling safety. Based on Hagdorn and Brown’s method, this study establishes a model for increasing gas velocity after gas invasion in deepwater drilling, optimizes the influence of well deviation angle on the division principle of gas-flow pattern and gas slippage velocity in deviated wells, and realizes the real-time calculation of the time when the gas reaches subsea wellhead in accordance with the gas-liquid flow law in the wellbore after gas invasion. The results can effectively reflect the flow law of wellbore annulus after the gas invasion in deepwater-deviated well drilling and are of great significance for gas-invasion monitoring and well control.

Key words: deepwater, wellbore annulus, gas invasion, increasing velocity, numerical model

CLC Number: 

  • TE52