KEYSEAT REAMERS WITH SLIDING SLEEVE

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MULTI-CYCLE CIRCULATING SUB

　　The Multi-Cycle Circulating Sub is a sub which can provide multiple open and close the circulation between sub’s inside and outsideby dropping the ball at the wellhead. The sub will be opened and closed by each ball dropped from the wellhead. The sub is suitable for horizontal and extended-reach wells.It is usually used in the cleaning and leaking process.

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SPECIAL BYPASS VALVE

　　The special bypass valve is a tool that provides circulation through the pressure difference. It is an ideal tool for use in large angle of inclination and horizontal wells.

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INCREMENTAL CIRCULATING VALVE (BYPASS VALVE)

　　Incremental circulating valve is a kind of by-pass valve, connect it close to drill bit before drilling oil and gas layer, and when drill bit was blocked in killing well operation, the by-pass valve can set up a new circulation channel and continue to implement killing well operation.

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IMPRESSION BLOCK

　　Impression block is used for determining the depth of fish and configuration of the top of fish, it can enable the operator to know the configuration of the top of fish and position in the well bore, then select proper fishing tool to catch successfully.

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SAFETY JOINT

　　Safety joint is one kind of downhole work safety equipment for fishing, washover and testing. Which could connect with needed parts in downhole and could bear various tension and compression load and transmit torque in the operation. It is easy to back off once the safety joint is needed, so that convenience to disassemble it supper drill stem. It is also easy to connect and continue to work when running in downhole again.

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BACK OFF SUB

　　Back off sub is also called back off spear. It can replace the taper tap, fishing or back off when dealing with sticking. If the fish is stuck or cannot be back off, it can release from the back off sub, and then trip the drilling tool.

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