International Drillstem Testing: canadian drillstem testing analysis solutions

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CASED-HOLE MECHANICALLY OPERATED TOOLS

In a mechanical cased hole test, the operator has determined from core samples and logs exactly where the casing has been perforated. The packer is positioned appropriately on the drillstem and the tools lowered into the cased hole. Placing weight on the tool string opens the hydraulic valve allowing the formation to flow into the tool and rise to the surface. The formation is flowed for a specified time period, after which weight is removed from the tool string closing the hydraulic valve for a specified shut-in period. Measuring flows and shut-ins with this procedure can be performed as many times as are deemed necessary.

Pump-Out Sub (POS-1003)
The Pump-Out Sub is used to circulate fluid from the drill string after the DST has been completed and the drill string is ready to be removed.

Recorder Hanger (RH-1010)
The Recorder Hanger is used to hang a pressure recorder inside the length of spacing or drill pipe (bomb well).

Dual Recorder Carrier (DRC-1020)
The Dual Recorder Carrier is designed to be run in the test interval and holds two pressure recorders. Recorders are loaded through loosely fitted doors bolted to the sides of the carrier.

Hydraulic Valve (HV-1002)
The Hydraulic Valve is a down hole valve used in opening and closing the flow from the test zone. The tool gives positive surface indications of opening: a sudden small movement of the drill pipe, combined with a slight reduction in drill pipe weight.

Squeeze Tool (ST-2004)
The Squeeze Tool is a check valve that opens to balance tubing to annular pressure when the tubing pressure exceeds annular pressure. This prevents supercharging of the formation in the interval while setting packers or opening downhole hydraulic valve.

Hydraulic Jars (HJ-2007)
The Hydraulic Jars allow jarring of the test string to aid in the freeing of downhole tools. The jar provides a temporary resistance that allows the drill pipe to be stretched. When the resistance is released, the drill pipe contracts to deliver the impact and freeing force.

Safety Joint (SJ-2005)
The Safety Joint provides a means for releasing from a set of tools that are stuck in the hole.

Retrievable Casing Packer (RCP-3130)
The Retrievable Casing Packer permits unrestricted flow and passage of full gauge wireline tool and accessories with an unrestricted ID, making it ideal for zone isolation, injection, testing, perforating and production. Retrievable Casing Packers can be set for testing in tension, compression or neutral.

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