The impact of an operation to improve oil flows at one of the UK’s newest production wells has been revealed in the most recent data.
Figures published today by the Oil & Gas Authority show that oil production at Horse Hill, in Surrey, was down almost 50% in October 2020, compared with the month before.
October’s figures, at 197 tonnes of oil or 47 barrels per day, were the lowest for the site since official production began in March 2020.
The fall had been expected because it coincided with a workover of the Portland section of the Horse Hill-1 (HH-1) well.
In an operation which began on 1 October 2020, the site operator, Horse Hill Developments Limited (HHDL), reperforated part of the HH-1 well. It also inserted a new production string and placed the downhole pump at a deeper level.
A statement to investors last month revealed that production uptime for HH-1 in October 2020 was 37% of the total time available.
The intervention was designed to improve the flow of oil from the Portland and was followed by a series of trials , the company said.
HHDL is also seeking a solution to the problem of formation water produced along with the oil. This reached a peak of 235 tonnes in June 2020. The company intends to convert the HH-2z well into a water reinjector to avoid the need to remove formation water by tanker for processing.
Today’s figures show there was no formation water produced in October 2020.
In a statement to DrillOrDrop, HHDL’s parent company, UK Oil & Gas, said:
“In October we were producing back completion fluids from the Horse Hill-1 well intervention, with the resumption of formation water production being in November.”
Completion fluids are typically brines used to complete a well, or make it ready for production.
Associated gas produced at Horse Hill was also down in October 2020, at 4.28 tonnes, compared with 15.5 tonnes on September 2020.