Gate blowout preventer with automatic closing position keeping function and blowout preventing method thereof

Abstract

The invention provides a gate blowout preventer with an automatic closing position keeping function for preventing blowout. The gate blowout preventer comprises a gate blowout preventer body connectedwith a well mouth, wherein an opening mouth and a closing mouth of the blowout preventer are respectively connected with corresponding oil ports of a blowout preventer control system. Two completelyidentical pilot operated check valves and two completely identical pressure transmission devices are connected to the gate blowout preventer body. The pilot operated check valves utilize the one-way flow limiting function to be communicated with oil paths of the opening mouth and the closing mouth to achieve opening and closing of a gate of the gate blowout preventer and automatic keeping of the closed position of the gate blowout preventer. The pressure transmission devices transfer annulus pressure of a shaft to a gate closing chamber of the gate blowout preventer to achieve automatic keeping of the closing position of the gate blowout preventer. The invention also includes a blowout preventing method of the blowout preventer. The gate blowout preventer can automatically keep the gate atthe well mount in the closed position in case of hydraulic pressure loss when the blowout preventer is closed, prevent the blowout, does not require human intervention, and has good popularization value.

Description

technical field [0001] The invention relates to the technical field of oil and gas drilling and oil production safety equipment, in particular to a ram blowout preventer with the function of automatically maintaining the closed position. Background technique [0002] The ram blowout preventer is one of the key equipment of drilling equipment in the petroleum and natural gas industry. With crude oil and water to form well kick and blowout, it is a safety sealing device installed at the wellhead to prevent well kick and blowout. [0003] The existing ram BOP generally adopts a locking device (including a manual locking lever, a hydraulic locking device, etc.) to lock the BOP when it is closed, so as to keep the BOP always in the closed state. In this case, if people forget to lock the locking device of the ram BOP, there is a big risk that the closed state of the ram BOP may fail (such as hydraulic oil source pressure drops, Hydraulic oil pipeline leakage, etc.), if the well...

AI Technical Summary

Problems solved by technology

In this case, if people forget to lock the locking device of the ram BOP, there is a great risk that the closed state of the ram BOP may fail (such as hydraulic oil source pressure drops, hydraulic oil pipeline leakage, etc.), if the wellbore pressure increases at this time, it is very likely that the ram will be pushed open by the wellbore pressure, and then the ram blowout preventer will lose its sealing effect, resulting in serious accidents such as blowout

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