Stimulation challenges in a deep, low permeability volcanic rock reservoir.

The first multi-stage completion in a deep, hot, and low permeability volcanic rock of the Minami-Nagaoka Field, Niigata Prefecture, Japan, was successfully completed using six propped fracture treatment stages in 2001. This concept was introduced through the joint research program, “Productivity Improvement in a Deep Volcanic Rock Reservoir”, between Japan National Oil Corporation and Teikoku Oil Co., Ltd. started in 1997. The history and current status of Minami-Nagaoka Field is briefly reviewed and the outline of this project including the background of project initiation is discussed.