A “significant” amount of oil has flowed to the surface at the Horse Hill-1 discovery, located in the UK’s Weald Basin, according to UK Oil & Gas Investments plc.
The flow commenced Monday at around 10am GMT from an 80-foot zone within the Lower Kimmeridge limestone interval at a depth of approximately 3,000 feet below ground level. An initial rate in excess of 700 barrels per day was reported at the site, using a one inch choke, in an approximate mix of 50:50 oil to water. The well was then choked back to 32/64 inches resulting in a steady early oil rate in excess of 463 barrels of oil per day over a further 7.3-hour period, in an approximate mix of over 99 percent oil and less than 1 percent water.
The Lower Kimmeridge flow period was planned to continue today at 7am GMT following an overnight shut-in from 7pm GMT Monday. Upon completion, phase 2 and phase 3 operations will move to the shallower Upper Kimmeridge limestone and Portland sandstone zones at approximately 2,755 feet and 2,017 feet below ground level, respectively. Situated within the onshore exploration Licence PEDL137 on the northern side of the Weald Basin near Gatwick Airport, the HH-1 discovery well completed its original exploration drilling phase at the end of 2014.
In August last year, Schlumberger calculated that 10.993 billion barrels of mean oil in place was imbedded within the 55 square miles of the PEDL137 and PEDL246 Horse Hill licenses. Schlumberger’s latest estimates build on the company’s previous petrophysical evaluation of the Horse Hill-1 well, located in PEDL137 near to London Gatwick Airport, which estimated the gross OIP for the Jurassic section of the UK’s HH-1 well to be approximately 271 million barrels of oil per square mile. A previous report by US petrophysical analysis firm Nutech estimated that the Horse Hill-1 well contained a total OIP value of 158 million barrels per square mile. Schlumberger’s latest report incorporates the analysis of a further nine wells located within and beyond the license area.
UKOG’s Executive Chairman Stephen Sanderson commented in a company statement:
“This is a very significant event for the company and for oil and gas activity in the Weald basin of southern England. Importantly, tests so far show oil has flowed to the surface under its own pressure and has not, so far, required artificial lift.
“The flow test, the first ever in the Lower Kimmeridge limestone within the Weald basin, provides proof that significant quantities of moveable oil exist within the Kimmeridge section of the well and can be brought to surface at excellent flow rates. In this case from a vertical well with minimal stimulation.
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