Pressure stimulation tests in the 5L-38 well

There were three successful Modular Formation Dynamics Tester (MDT) tests that provided two important pieces of information (1) evidence of hydrates through the reservoir response to pressure simulation and (2) geomechanical/geothermal measurements at pressure production interval. 

About 30 min into the test, gas was removed for 8 min to reduce the pressure, then for 25 min the pressure increased as reservoir hydrates dissociated, flowing gas into the well. 

Similarly at 1.2 h the pressure was drawn down for 37 min, and dissociating hydrates replenished the pressure over the next 69 min. The response time for the pressures can be modeled as indications of reservoir permeability, determined to range from 0.001 to 0.1 mD. 

FIGURE 7.38 Mallik 2002 pressure stimulation test 2 at 1090 m, showing the initial three flow and shut-in sequences, 3 fractures sequences, and a final flow and shut in sequence. (From Hancock, S. H., et al., in Scientific Results from the Mallik 2002 Gas Hydrate Production Research Well Program, Mackenzie Delta, Northwest Territories, Canada, Geological Survey of Canada Bulletin 585, including CD (2005b). With permission.) 

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