Wentworth Resources Limited announced an update on its assessment of the Ziwani-1 well test, located in the Mnazi Bay Concession, Tanzania. The Ziwani-1 well was spudded on February 1, 2012 and drilled to a final total depth of 8,763 feet (2,671 meters). The gas bearing zone between 3,629 and 3,638 feet (1,106 and 1,109 meters) has now been tested using drill stem equipment. The zone flowed gas at an unstable rate of up to 7.2 million standard cubic feet per day at a well head pressure of up to 973 psi on a choke of 36/64".
The tested zone is a new reservoir interval, not previously encountered in the Mnazi Bay Block. The reservoir is a clean limestone of Pliocene age 11.5 (3.5 meters) thick with 17 percent porosity and 78 percent hydrocarbon saturation. However, analysis of the test data indicates that the potential resource volumes of the well are sub-commercial and the well has therefore been plugged and abandoned.
Although several sandstone intervals of Oligocene/Eocene age were penetrated deeper in the well, logging proved these to be water bearing.
The rig will now be moved to the Mnazi Bay gas field, where it will commence a workover program of three wells (MB-2, MB-3 and MS-1X). An extended well test is expected to be conducted on each of these wells in order to establish the long term producibility of the Mnazi Bay and Msimbati gas fields. The partners are planning on drilling a second exploration well on the Concession Area once the workovers have been completed.
Executive Chairman, Bob McBean, commented: "Although the results of Ziwani-1 did not meet our expectations, we remain committed to our exploration program on the block and to the second well, which is expected to be drilled later this year. We look forward to the forthcoming workover program as the next step in development of the Mnazi Bay and Msimbati gas fields."
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