Design and analysis of continuous circulation valve

Abstract:

The continuous circulation valve can maintain the continuous circulation of drilling fluid when drilling is stopped, which can effectively solve the sediment at the bottom of the hole and the fluctuation of pressure at the bottom of the hole, especially for the horizontal drilling of oil and gas in the sea. In this paper, a continuous circulation valve is designed, the structure and working principle of the continuous circulation valve are introduced, the force analysis and structural optimization design are conducted on the strength of the body under extreme working conditions, and the side opening of the bypass valve with a safety factor greater than 1.5 times was selected; A finite element stress analysis is conducted on the bypass valve, which comprehensively analyzed the stress distribution and sealing pressure. The influence of changes in the half cone angle of the sealing pair and the thickness of the valve on the stress and sealing effect of the bypass valve is obtained. The half cone angle of the sealing pair and the thickness of the valve are selected, and the bypass valve sealing test and body strength test are conducted, proving that the strength and sealing performance of the continuous circulation valve meet the actual usage requirements.