Welltest 106: Impulse & Closed Chamber Tests

Impulse Tests are Useful for many Other Applications. Surface casing-vent tests can be conducted using the closed-chamber method. Closed-chamber drill stem tests. Pre-frac’ evaluations and frac’ falloff tests. Alberta AER Initial Pressure requirements can be achieved with a variety of subsurface pressure PID techniques:

• Recorders on bottom before perforating (used with TCP guns)
• Recorders attached to the drop bar (use a spring to dampen impact on gauges)
• Recorders on bottom after perforating (may have wellbore storage issues)
• Recorders on bottom below a WR bridge plug (limits wellbore storage issues)
• Horizontal well, multi-stage frac’ string installed, run recorders, open toe port (becomes a Formation Leak-off test)

Portions of this iReport were derived from the technical paper cim 2000–80 “Impulse, Perforation and Closed Chamber Testing: Simple, Quick Cost-effective Snapshots of Reservoir Inflow Characteristics”  by David Leech, Robert V. Hawkes, Paul Storey and Sharyda Brown.