Detail


Casing Cutting

Furmanite’s many years of experience in solving problems on site has enabled development of a specialist casing cutting service designed to provide the oil industry with a quick, safe and effective method for cutting and profiling casings on offshore/onshore wellheads. Designed for the demanding environment of the North Sea, the machines are successfully used in numerous applications worldwide.

Casing cutting (tube in tube) is a special application. The oil and gas drilling industries have experienced problems inserting the tubing carrying the oil or gas from the reservoir to the surface, due to sticking in the casing. When this occurs an emergency cut is made to achieve the correct configuration for a seal to the wellhead. A special Furmanite casing cutting machine is mounted on the wellhead, instead of the pipe outside diameter is used to cut the casing at a predetermined height, either above or below the wellhead flange.

Traditionally, casing cutting has been carried out manually by burning and grinding techniques which are not only time consuming but can also cause substantial deformation and surface damage to the casing, making subsequent sealing difficult. Furthermore, since no burning is involved in the Furmanite method, possible hazards created by the presence of oil based muds are reduced to an absolute minimum. The air powered machines are designed for safe use where the potential presence of flammable oil or gas at the wellhead prevents the use of hot cutting equipment.

The Furmanite casing cutting machines cut and profile both internal and external casings ranging from 130mm to 245mm (5.2” to 9.625”) when cutting internally and 500mm (20”) down to 125mm (5”) when cutting externally. The main sections of the machine are designed to split into two halves allowing the whole unit to be mounted quickly and simply by “wrapping” it around the casing. The machines are pneumatically powered and incorporate automatic toolpost traverse to permit a “hands free” operation. Designed to be rigid, accurate and reliable, Furmanite casing cutting activities are delivered through its global operations. The unique Furmanite design includes two simple operations. First the clamp type machine (split in two halves for easy fitting) is mounted on the face of the hub and cuts through the protruding casing to make it flush with the top of the wellhead. Then the casing is cut internally using the boring bar, which cuts through from inside and bevels the edge to ensure a smooth chamfer for the installation of the seal assembly.

Both operations produce accurate and clean results in a simple operation with greatly reduced cutting time. There is no need for rough cuts or to drain the casing prior to cutting.

In some specialist cases, customers have required casings cut which fall outside the standard machine range. Furmanite has modified existing machines to meet the individual customer demands with very little notice required. Whatever the casing cutting demands, Furmanite is able to offer a fast track solution enabling the wellhead operations to continue.

 

Pipe Cutting and Weld-Prepping

Pipe cutting is the process of cutting any size pipe either perpendicular to its length or at an angle. There is no limitation to diameter or wall thickness. Several methods may be used to achieve this depending on the size and type of the pipe to be cut and involve both internally and externally mounted cutting equipment. The traditional method of flame cutting heats the pipe and leave an unacceptable heat affected zone. Furmanite’s range of cold cutting and weld prepping machines can quickly cut and weld prep pipes to a finish suitable for welding. Weld preps can be formed to any requirements, such as straight, 37.50, bevels and ‘j’ prep configurations.

Typical operations using a pipe cutter or weld prepper:

  • Cutting new pipe work to length and forming weld preps
  • Straight cuts to destroy old or redundant pipe work
  • Cutting out sections of pipe for inspection purposes
  • Cutting off damaged flanges or hubs
  • Cutting out welded-in valves for repair or replacement
  • Cutting out sections of damaged, corroded or defective pipe work
  • Weld excavations for repair of defective welds
  • Casing cutting and prepping

Furmanite range and capacity for pipe cutting and weld prepping

Bore mounted weld prep machines:

  • Collect type bore mounting machines, bore size range: 13mm – 360mm (0.5” – 14.0”)
  • Bore mounting machines, bore size: 300mm – 2438mm (12” – 96”)

Outside diameter mounting pipe cutting and prepping machines:

  • Mounted on nominal bore pipe work: 150mm – 2800mm (6”nb – 110”nb)

Surface finishes possible with pipe cutting and prepping machines:

  • Pipe cutting straight cuts – 3.2mm Ra to 6.3mm Ra (125 CLA to 250 CLA)
  • Weld preps block formed – 3.2mm Ra to 6.3mm Ra (125 CLA to 250 CLA)
  • Weld preps single point cutting – 1.6mm Ra to 6.3mm Ra (63 CLA to 250 CLA)
  • Match boring – 1.6mm Ra to 6.3mm Ra (63 CLA to 250 CLA)

Achievable tolerances with pipe cutting and prepping:

  • Pipe cutting – cut lengths to marking out + 0.6mm (0.016”), prep angles + 0.50
  • Prepping machines – machining to finished length + 0.6mm (0.016”), prep angles + 0.50

Power requirements and utilities required on site:

Cutting and prepping machines-

  • Air supply, 2.69m3/min @ 6 bar (95 CFM @ 90 PSI)

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