The Pilot Drilling Control Ltd Casing Scraper generates its axial loading by utilising the known mec

1
Casing Scraper

• The Pilot Drilling Control Ltd Casing Scraper
  generates its axial loading by utilising the
  known mechanical properties and characteristics
  of the drillpipe. The tools concept is based upon
  a simply supported beam that undergoes deflection
  at its midpoint. This novel idea ensures that the
  scraper elements are in contact with the casing
  wall at all times and in any orientation of
  pipeline, even through horizontal operation. By
  having a pair of eccentric scraping cam sleeves
  mounted in opposite orientation some distance
  apart, a slight bend can be induced into the
  pipe. The pipes natural reaction to rectify this
  bend is what supplies the scraping cam sections
  of the tool with the axial force they require.

Pilot Drilling Control Ltd Nouvotech
House Harbour Rd. Ind. Est. Lowestoft,
Suffolk NR32 3LZ, UK Tel [phone]
588422 Fax [phone] www.pdc-uk.com
2
Casing Scraper

• Description
• As with any casing scraping device, this tool
  relies on its ability to apply an axial loading
  to the internal wall of the casing. The industry
  standard solution is to use mechanisms
  incorporating spring loaded blades. Tools of this
  nature have obvious inherent faults they lose
  functionality in horizontal or lateral casing,
  they have large servicing requirements as they
  incorporate moving parts and they also introduce
  the risk of losing removable parts down hole.
• Benefits
• Fully function either through Rotary or Static
  operation.
• 100 radial contact with the casing.
• Operate fully in horizontal or lateral holes.
• Successfully negotiate high dog legs.
• Scrape 360deg of the casing - even when not
  rotating.
• Eliminate the need for moving parts.
• Operate without the risk of losing parts
  down-hole.

www.pdc-uk.com info_at_pdc-uk.com
3
Features

• The tool has four eccentric Scraping cams. Each
  cam faces a different direction, 90 relative to
  the previous. This aspect of the design results
  in the tool being able to scrape 100 of the
  casing, even when being used without revolution.
  This complete contact is illustrated below.
• Complete Radial Contact

Varied Cam Orientation
www.pdc-uk.com info_at_pdc-uk.com
4
Tool Assembly

• The tool can either be assembled on the drill
  floor or supplied pre-assembled and torqued to
  current standards.
• As the tool has no moving parts the assembly
  procedure is very simple. Each of the eccentric
  cams needs to be offset by 90 from the previous.
  The position of each cam is constrained by
  internal splines located on the pin end of each
  centre-pipe section. When assembled on the rig
  floor, the cam would be sat on the pipe in the
  slips, the pin section with splines would be
  held above. The cam would be correctly positioned
  and the pipe above lowered until the splines are
  engaged. Once engaged the cam is lifted and the
  tool joint simply needs to be torqued up. Once
  the cams are positioned and the joints are
  torqued the tool is ready for deployment.

Eccentric Cam
Splines
www.pdc-uk.com info_at_pdc-uk.com
5
Tool Specification

• Design Details
• 9-5/8 Casing
• The tool is available for both 9-5/8 and 7-5/8
  casing applications with various cam scraper
  options.

www.pdc-uk.com info_at_pdc-uk.com