Samson Oil & Gas reported that the Harstad #1-15H well has been successfully fracture stimulated with the treatment being pumped on time and in accordance with the stimulation design. Treating pressures observed and log data collected since the fracture stimulation suggest that several different fracture areas were created.
Following a series of evaluation operations, the well has been placed on pump and has recovered most of the 2,500 barrels of stimulation fluids. The current oil rate is 300 BOPD representing an oil cut of 60% which is equivalent to the oil cut pre stimulation. This rate is likely to be increased in the short term by replacing the existing pump with a higher capacity pump.
The well is producing at a rate of 300 barrels per day from a 4,800 foot horizontal well bore, the same well bore and producing interval that produced the pre-stimulation rate of 68 barrels per day. The well is not cased over the productive section and is producing from a dolomitic limestone.
Following the completion of engineering designs, the company selected a five stage treatment process, using a hydrochloric acid stimulation fluid, which was pumped into the well bore to create the first fracture, followed by a diverting agent which was designed to divert the subsequent acid stage to create a second and then subsequent fractures along the horizontal well bore. The diverting agent is temperature sensitive and after 24 hours, it breaks down to a fluid which is then flowed back and removed from the well bore.
Given this successful result, two additional Proved Undeveloped locations have been created and the first of these will be drilled in the summer of 2008. The well design for these wells will be improved and the horizontal section diameter will be increased from the existing 4 and half-inch such that the acid stimulation can be achieved in multiple, discrete mechanically separated sections within the well bore. This will allow for multiple fracture creation and therefore the subsequent oil rate will be improved.
The Harstad well is located in the Williston Basin in North Dakota and produces from the Bluell Formation, which is developed in this field using horizontal completions. Samson's working interest in the Harstad well is 34.5% (NRI 26.4%). Due to ownership difference across the leased area, Samson's total working interest in the prospect is 41% (NRI 31%).
Samson's Ordinary Shares are traded on the Australian Securities Exchange under the symbol "SSN". Samson's American Depositary Receipts (ADRs) are traded on the American Stock Exchange under the symbol "SSN", and, each ADR represents 20 fully paid Ordinary Shares of Samson.
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