• Interfacing with Rig Tools

    Interfacing with the Top Drive

    Top Drive Bell

    The top drive bell (also called top drive flippers) is the piece of equipment that centers the top drive saver sub pin connection into the stand or string upper box connection. The bell inner diameter shall be adjusted to be at maximum ½" larger than the tool joint nominal OD. Each connection should be made individually.

    Top Drive Saver Sub (TDSS)

    The TDSS lower pin connection is the most made up in the entire string. If damaged, it has potential to propagate damage to the entire string. In most configurations, there is a large diameter variation between the larger section of the sub and the critical bottom connection and, it is vitally important to have high strength, high toughness and consistent hardness through the wall of the TDSS. Grant Prideco only builds TDSS from double heat treated material, as it extends the product service life.

    Interfacing with the Iron Roughneck

    Pressure of Iron Roughneck (IRN) jaws is important to avoid egging, tearing of tool joint material by slippage (increasing the pressure is not always the solution!). Condition of the jaw dies affects their ability to bite causing tearing of tool joint material by slippage. Check with manufacturer for directions on IRN maintenance.

    Be sure to practice correct tong placement when making up connections (See chart below). Make up connections to proper MUT. Do not hesitate to make connections up to maximum MUT specified on performance data sheet.

    We recommend the use of IRNs with multiple tong dies points (take extra care with units with two 180-degree-apart dies). Not all IRNs are designed to give a break-out torque reading.

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    Interfacing with Slips

    Stopping pipe with slips

    Effects of stopping downward motion of drill pipe with slips: Swedges and elongates pipe in slip area Stretches and bottlenecks pipe Transmits excessive load to rotary table and master bushings or slip bowl Note: Slips should not be dropped on a moving string!

    Slip test

    Hook load must be 100,000 lbs to ensure correct insert marking on pipe. Clean section of pipe which is free of previous insert marks. Wrap waterproof paper around cleaned section of pipe and taper seam. Place rotary slips around wrapped section of pipe and lower pipe and slips with normal setting speed. Removal. Hold slips together and raise pipe. Remove slips carefully when hole is cleared. Remove paper carefully. If successful, the paper should display a regular pattern of die marks from top to bottom and circumferentially.

    GP-Running-and-Handling

    Interfacing with Elevator

    Most strings are coming with 18 degree taper to be used with 18 degree elevator. Still, some users use 90 degree elevator. As the tool joint OD wears, the contact area reduces and so does elevator capacity. Ask for elevator capacity curve if necessary.

    Drill Collar elevator recesses (ER) wear down and lose shape leading to poor sitting on 90 degree elevator. ER are stress risers (sharp radius - cold rolled to enhance resistance) and can be fatigue crack initiation site. Inspect your collar recesses. Avoid using collars with worn ER. Note: It is recommended that lift subs be used when possible (safer and saves time).

    Most heavy weight drill pipe are coming with 18 degree taper to be used with 18 degree elevator. (Some users still use 90 degree). As the tool joint OD wears, the contact area reduces and so does elevator capacity. Ask for elevator capacity curve if necessary. It is generally not an issue with HWDP as they are located low in the string.

     

    Related Products

    Land Rigs

    Offshore Rigs

    Handling Tools

    Handling Tools

    Pipe Handling

    Pipe Handling

    Iron Roughnecks

    Iron Roughnecks

     

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