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    MSC-A MECHANICAL STAGE CEMENTING COLLAR

    MSC-A mechanical stage cementer designed with inner-closing structure, in which the circulation ports are opened with free-fall or pumping-down opening plug. The closing plug drivers the closing sleeve to shut the circulation ports. Features: 1. With inner-closing structure, the stage cementer can bring permanent self-locking after closing. 2. No fluid trapping and compression while opening and closing circulation ports. 3. The I.D.of upper/lower sub is the same as that of casing, but smaller than that of closing sleeve, which can minimize chances of damages to the closing sleeve. 4. The inner parts are made of easily drillable rubber/aluminum material. Both the opening and closing seats have anti-rotation mechanism for easy drillout. 5. With pumping-down opening plug, it is used in the operation of continuous cementing.

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    HSC-A HYDRAULIC STAGE CEMENTING

    HSC-A hydraulic stage cementer is designed with inner-closing structure, in which circulation ports are opened by fluid pressure difference. The closing plug drivers the closing sleeve to shut the circulation ports. Features: 1. Opening pressure can be adjusted and it is not affected by well deviation. 2. Circulation ports are opened by pumping. No fluid trapping and compression while opening and closing circulation ports.. 3. The I.D.of upper/lower sub is the same as that of casing, but smaller than that of closing sleeve, which can minimize chances of damages to the closing sleeve. 4. The inner parts are made of an easily drillable rubber/aluminum material. Both the opening and closing seats have anti-rotation mechanism for easy drillout.

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    STAGE CEMENTING COLLAR ACCESSORIES

    The accessories of MSC-A/HSC-A Stage Cementer include a first-stage plug, free-fall opening plug, closing plug, shut-off baffle and pumping-down opening plug. Being made of rubber or aluminum, these parts are easily drillable. Features: 1. The shut-off baffle is installed in the casing coupling, one joint above the float collar, used for pumping pressure of first-stage plug. 2. The first-stage plug is used to isolate the first-stage cement and drilling fluid. On the end of displacement, the first-stage plug lands and effects a seal against the shut-off baffle. 3. Featuring streamline shape and filled with lead, the free-fall opening plug can quickly free-fall to the lower sliding sleeve. When pressure is applied to the casing, it can open the circulation ports. 4. The closing plug is used to isolate the second-stage cement and drilling fluid. When running to the upper sliding sleeve, it effect a seat in the stage cementer. Pressure is applied to the casing and the circulation ports are closed. 5. The pump-down opening plug is used for continuous cementing operation and in deviated wells. It can open the circulation ports directly and quickly, while the free-fall opening plug needs longer time waiting for falling.  

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    TOOL JOINT

           Tool Joints acts for conversion and connection of drill stem component in petroleum, natural gas and geology drilling work. It is used mainly for connecting of upper drill tools and lower drill tools.

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    SIDE ENTRY SUB

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    CROSSOVER SUB

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