Afsluiter voor kabel kernboor

Dutch

tigre tierra

The "Tigre Tierra" Wireline Packer is a patented timesaving method for conducting permeability testing during core drilling.

The test is carried out with the drill string in place, reducing the time required to test in open or unstable formations. Available for all makes of wireline core barrels ( N,H and Q), "Tigre Tierra" Wireline packers are easily repaired in the field in just minutes.

The wireline packers incorporate a bumper that rests inside the throat of the drill bit.

This positions both packers and protects the drill bit. A compression cap "T" on the Tigre Tierra Seal Tee Assembly prevents pressure loss around the composite cable during testing. The composite cable itself is composed of a high pressure nylon tube for inflation and a cable to lower and retrieve the wireline packer.

Conducting a permeability test

  • Remove inner tube assembly.
  • Raise drill string off bottom, leaving desired test zone.
  • Install seal tee assembly at top of drill string.
  • Lower wireline packer assembly.
  • Tighten compression cap.
  • Connect composite cable to source of compressed fluid.
  • Inflate wireline packer.
  • Inject water through seal tee assembly wireline rods and packer into the test zone.
  • Perform permeability test.
  • Deflate wireline packer.
  • Remove packer and seal tee assembly.
  • Reinsert inner tube assembly.
  • Lower drill string and resume drililing.

OPTION

For testing specific zones, a " Tigre Tierra " zone packer can be easily attached to the lower end of the Wireline packer.

The Wireline packer is inverted and the zone packer is connected using a perforated tube the length of the required test zone. An inflation tube connects the Wireline packer and zone packer for simultaneous inflation.

tigre tierra

Wireline core barrels diameter N H P
Packer nominal diameter (mm) 42 56 72
Packer inner diameter (mm) 17 20 35

obturateur

This system is an easy way of positioning a Geopro inflatable packer below the wire-line core bit in open hole for conducting permeability testing.

This packer assembly incorporates a positioning ring which rests on the drilling bit inner shoulder. This positioning ring end can be fitted, on request, with a pressure transducer for read out of the "in situ" pressure especially useful for permeability tests.

This simple and economical device saves time for the rig operator and is available for all makes of core barrels.

Different options are available:

  • pressure intake at top of packer.*
  • double packer attachment and extension zone test kits.

*pressure intake option

Wire-line corebarrels nominal Ø Bore-hole Ø (mm) Core bit ID Ø (mm) Packer nominal Ø (mm) Recom. Max. working pressure
N 75,6 47,6 42 40
H 96,3 63,5 56 35
P 122,3 85 72 30
P 146,3 102 98 50
Copyright Geotechno 2018 -