A multi-stage circulation sub is a connector that provides multiple cycles of switching between jet and annulus circulation (on/off) by dropping balls at the wellhead. Each ball drop creates a distinct open or closed position. This product is suitable for extended reach wells and horizontal wells, and is typically used for wellbore cleanout or lost circulation operations during drilling.
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A special bypass valve is a tool that provides circulation matching through pressure difference. It is an ideal tool for use in highly inclined and horizontal wells.
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Incremental circulation valve (bypass valve)
An incremental bypass valve is a drilling tool bypass valve. Before drilling into the oil and gas reservoir, the drilling tool bypass valve is connected to the outside of the drill string near the drill bit. When the drill bit water eye is blocked during well control operations, the bypass valve can establish a new circulation channel to continue the well control operation.
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A safety sub is a safety device used in downhole operations such as fishing, milling and testing. It can be connected to the required parts downhole and can withstand various tensile and compressive loads and transmit torque during operations. When needed during downhole operations, the safety sub is easy to disconnect to remove the upper string. When drilling again, it is also easy to reconnect and continue downhole operations.
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The reverse-coupling joint, also known as the reverse-coupling spear, can replace the public cone for fishing or reverse coupling in the reverse coupling operation for handling stuck drill accidents. If the fishing tool is stuck or cannot be opened, it can be withdrawn from the reverse coupling joint to retrieve the fishing drill string.
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