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Cased Hole Drillstem Testing ToolCased Hole Drillstem Testing Tool

The Cased Hole Drillstem Testing Tool is used for testing formations after casing has been set in a well. These tools may be used for testing vertical or highly deviated wells. In addition, these tools maybe used for land or offshore wells.

Cased hole tools are available in a standard bore or a full-bore configuration. Full-bore tools allow perforating through the system. As well, full-bore tools allow high production flow rates.

A hookwall packer is used to isolate zones and to anchor the tools against the casing. This packer is operated by applying an upward pull to the tool string, rotating a half turn to the right, and setting down partial string weight on the packer. A straight upward pull releases the packer. An integral bypass passage in the packer assembly allows pressure to equalize across the packer at the end of the drillstem  test.

Multiple flow periods and shut-in periods may be obtained with cased  hole drillstem testing tools. The hydraulic shut-in tool is opened  by setting partial string weight to the tool and is closed by applying  a slight upward pull to the tool. A pressure-volume balanced slip joint assembly is used to easily identify free travel for opening and closing the hydraulic shut-in tool.

Product Features

  • System allows testing of formations after casing has been run into a well. Concerns about open hole formations are eliminated.
  • System may be used for land or offshore operations.
  • System may be used in vertical or highly deviated wells.
  • System is very economical to operate.
  • Multiple flow periods and shut-in periods may be obtained with each zone tested.
  • Full-bore configuration allows perforating through the system and high flow rate production.         
Tool Sizes                  Available
O.D. (mm) O.D. (in)
79 3.12
108 4.25
127 5.00