Detailed casing power tongs

Casing power tongs

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Typical liquid-gas combined drive, such as TQ-35 type, can catch (5~13.3/min). The maximum torque is 35kN m.

Power Tong Model

With the development of drilling equipment technology, large-diameter and high-torque hydraulic casing clamps such as TQ508-70Y and iron well drilling casing clamps have been gradually improved, with high precision, high degree of automation and low labor intensity. This paper introduces the casing power clamps commonly used in Changqing area.

Structural principle of the main components of the power tong

The hydraulic casing clamp is driven by a hydraulic motor, and the motor adopts a single-drive or double-drive structure, and the driving force is provided by a gearbox and a hydraulic power unit. Combined hydraulic and air drive, enhanced and rotated by gear motors and airbags. During work, the casing hoop is suspended in the well with a steel cable, and the spare rope is used to prevent the hoop from rotating due to the torque force of the fence string and provide counter torque.

1. Hydraulic system.

The hydraulic system is composed of hydraulic power unit, hydraulic motor, control valve, pressure reducing valve, quick connector, pipeline and so on.

Schematic diagram of casing power tong hydraulic system

2. Transmission system

Clamping and rotation of the chin plate is achieved by gears. A hydraulic gear motor transmits machine power through a gearbox and gears, turning the gears. The hydraulic-pneumatic coupling drive realizes the low-speed conversion of the airbag.

Hydraulic-pneumatic combined drive drive drive system

3. Chin system.

The jaw system of hydraulic casing tongs is installed on the three jaws, two front jaws, two small parts of the big ring ring, the main jaw is installed on most of the big ring ring, on the big ring, reverse Under the combined action of the stop pins, the three jaw plates rotate and act on the casing.

4. Inspection and maintenance of power tongs

Check whether the entire equipment and fittings are damaged, and whether there are leaks in pipes, motors, control valves and other components. If damaged or leaked.

5. Focus on the following sections

Check whether the jaw plate clamp is damaged, broken or excessively worn, and whether it can effectively bite the pipe string, and replace it if the wear is serious.

6. Ring gear rotating gear

Check the large gear for damage, breakage or excessive wear. If two or more adjacent teeth are broken, they need to be replaced. If you find badly worn or broken teeth, you should check the internal gear for damage. There are metal pieces.

7. Latch spring

Make sure the latch spring has enough force to close the latch door, and replace with a new latch spring if necessary.

8. Main jaw wheel

Make sure that the jaw rollers can rotate freely. Regularly add grease to the top of the roller shaft.

9. Monthly inspection, carry out the following inspections every month, and take appropriate measures.

A. Check the wear of the large ring guide wheel and replace it if necessary.

B. Check the main chin roller for wear and replace if necessary.

C. Make sure the shifting handle, the handle moves normally, and the operation is flexible.

D. Check the large ring gear and internal gear.

e. Inspect door and nose latches for obvious wear and damage.

f. Check the gearbox oil level.

g. Check the flow rate of the torque system sensor cylinder. If more than 1/2' (12.7 mm) of the barrel (piston) rod is exposed when pulled, the liquid level is low.

h, make sure all fasteners are loose.

Good lubrication is critical to the long-term use of casing power grips.