A flow stop valve (20) positioned in a downhole tubular (6), wherein: the flow stop valve (20) is in a closed position when a pressure difference between fluid outside the downhole tubular (6) and inside the downhole tubular (6) at the flow stop valve (20) is below a threshold value, thereby preventing flow through the downhole tubular; and the flow stop valve (20) is in an open position when the pressure difference between fluid outside the downhole tubular (6) and inside the downhole tubular (6) at the flow stop valve (20) is above a threshold value, thereby permitting flow through the downhole tubular (6).
申请公布号
WO2009101424(A3)
申请公布日期
2010.02.11
申请号
WO2009GB00414
申请日期
2009.02.16
申请人
PILOT DRILLING CONTROL LIMITED;SWIETLIK, GEORGE;LARGE, ROBERT