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Choke manifold is necessary device to control the well kicksuccessfully and execute the pressure control technologyon oil/gas well in the course of drilling, as it is, the deviceis adopted to execute new drilling-well's technique ofbalance pressure, which can avoid pollution of oil-layerimprove the speed of drilling and control blowout effectively.One end of the device connects with the side flange of BOPspool, when BOP closes, it can control the finite pressurefrom casing by adjusting the choke valve's opening,so balanced drilling can work under minimum pressure-difference.
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