Foothills Resources, Inc. reported on the status of its GB 4 well on the deep Grizzly Bear prospect, which underlies the Grizzly Bluff Field in the Eel River Basin in Humboldt County, California. The GB 4 well has been successfully drilled using oil-based mud to a total depth of 9,530 feet, electric logs have been run and a production liner cemented in place to prepare for a comprehensive production testing program. Drilling time was about two weeks longer than planned due to the need to set a second intermediate string of casing at 8,200 feet.
This additional casing was necessitated by the high pressures and high gas readings encountered while drilling. Surface casing was set at 1,500 feet and the first intermediate string of casing was set at 5,400 feet.
GB 4 well was successfully drilled using oil-based mud to a total depth of 9,530 feet, electric logs have been run and a production liner cemented in place to prepare for a comprehensive production testing program.
The successful drilling of the GB 4 well achieved two primary objectives: offset the Zephyr GB 1 well drilled in 1964 that tested gas at significant flow rates from the Lower Rio Dell formation ("LRD") and evaluate the deeper formations below the Grizzly Bluff Field with the drillbit -- the Grizzly Bear prospect.
The Foothills GB 4 well encountered the same gas-bearing zones in the LRD formation that tested gas at the rate of 5 million cubic feet of gas per day in the Zephyr well.
The well encountered extensive gas shows and electric log indications of potential gas-bearing zones from the deeper formations in the Grizzly Bear prospect.
A testing program on the GB 4 well is expected to commence as soon as a completion rig is available and is expected to require several weeks to complete due to the number of tests planned for the evaluation program.
The drilling of the GB 4 well is expected to fulfill Foothills' obligations in its Eel River joint venture and remove existing depth restrictions. Foothills is the operator of the joint venture, is paying 100% of the costs of drilling the GB 4 well, and will retain a 75% working interest in the well.
John Moran, President of Foothills Resources, said, "Initial results of the GB 4 well have confirmed strong gas shows in multiple horizons and gave us encouragement to set a production liner to test the well. Further, the core samples taken will provide critical information for the future development of the Grizzly Bluff Field. It is worth noting that these are the first cores ever taken from the LRD sands and we expect them to yield a wealth of important data."
Moran continued, "While drilling took longer than planned, we are very pleased to reach total depth successfully and are eager to start the testing phase of the well. We expect to provide periodic updates during the testing phase."
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