Well killing method used for eliminating gravity displacement of horizontal well
A technology for eliminating gravity and horizontal wells, which is applied in wellbore/well components, earthwork drilling, flushing wellbore, etc. It can solve the problems of not being able to eliminate gravity displacement, continuous entry of oil and gas into the well, and long well killing time, etc., to achieve Easy operation, short well killing time and low well killing cost
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[0039] Below in conjunction with embodiment the present invention is described further.
[0040] A well killing method for eliminating gravity displacement in a horizontal well of the present invention, step S10, determining the closing pressure of the annular blowout preventer according to the well pressure when shutting in the well and the size of the drilling tool closed by the wellhead sealer;
[0041] Obtain the cross-sectional area A of the piston of the annular blowout preventer and the contact area S between the rubber core and the drilling tool according to the size of the annular blowout preventer and the drilling tool; then determine the closing pressure of the annular blowout preventer according to the following formula;
[0042] P 关闭压力 =P 最低 +P 变 A / S-P 井压
[0043] In the formula: P 关闭压力 is the closing pressure of the annular blowout preventer; P 最低 is the minimum closing pressure, which is a known number and is the design parameter of the annular blowout pre...
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