Oil production at the Horse Hill site in Surrey fell for a second month in a row, according to official data published today.
The news coincided with the start of work intended to improve oil flows at the site near Gatwick.
A workover rig arrived this morning, followed by a statement from the operator’s parent company, UK Oil & Gas plc (UKOG).
The work, previously announced in June 2020, will reperforate the full Portland oil producing section of the Horse Hill-1 well (HH-1), UKOG said. A “new simplified production tubing string” would also be inserted and the downhole pump set at a deeper level to “increase pumping efficiency”.
UKOG’s chief executive, Stephen Sanderson, said:
“We look forward to safe, swift and successful operations and to the resumption of stable oil production at Horse Hill as soon as possible.”
UKOG has said HH-1 has produced more than 300 barrels of oil per day “almost continuously”. It said the well was the UK’s most productive outside the Wytch Farm oilfield in Dorset.
Data released by the Oil & Gas Authority (OGA) today revealed that in June 2020 Horse Hill produced 157 barrels of oil per day (bpd), or a total of 637 tonnes. This was down from 176 bpd or 737 tonnes in May 2020 and 243 bpd or 981 tonnes in April 2020.
The Horse Hill site was ranked sixth by oil production in June 2020, down two places on April and May 2020.
The data, always published three months in arrears, also showed that water and gas production at Horse Hill had increased.
In June 2020, water production was 49 bpd (236 tonnes in total), just under a third of oil production. It was almost three times higher than the level in May 2020 (17 bpd or 88 tonnes). Water production in April was less than a barrel a day or a total of 0.9 tonnes.
Gas production, which is burned in a flare at Horse Hill, was 24.71 tonnes in June 2020, up from 22.04 in May 2020.