A steady fall in oil production has continued at UKOG’s Horse Hill site in Surrey, according to the latest monthly official data released today.
The site, originally nicknamed the Gatwick Gusher, saw oil production drop in July 2020 for the third month in a row.
Horse Hill has also fell another place in the rankings of UK onshore oilfields.
Figures released by the Oil & Gas Authority (OGA) revealed that in July 2020, the site produced 121 barrels of oil per day (bpd). This compares with 157 bpd in June, 176 bpd in May and 243 bpd in April 2020.
The weight of oil in July 2020 was 508 tonnes, down 26% on the total for June (637 tonnes). The weight was 737 tonnes in May 2020 and 981 tonnes in April 2020.
July 2020 was the fourth full month of oil production at Horse Hill.
In 2018, a Competent Persons Report (CPR) by the consultancy Xodus predicted a production rate of 250-500 bpd in the first year. In year three, in the downside case, Xodus predicted production would fall to 122.5 bpd, slightly above the figure for July 2020.
Last month, DrillOrDrop reported that work had begun at Horse Hill to improve production in the Horse Hill-1 well. UKOG said a “short intervention” sought to “further optimise oil flow via reperforating the full Portland oil producing section, insertion of a new simplified production tubing string and by setting the downhole pump at a deeper level to increase pumping efficiency”.
Horse Hill ranked seventh in the UK onshore for tonnes of oil produced In July 2020.
This was down from fourth in April 2020 and May 2020, when the site was behind Wytch Farm in Dorset, Welton in Lincolnshire and Singleton in West Sussex.
In June 2020, the site was pushed into sixth place by Humbly Grove and Stockbridge, both in Hampshire.
In the latest data, Horse Hill was also overtaken by Horndean, in Hampshire.
Today’s data also revealed that the production of formation water at Horse Hill fell slightly from 49 bpd to 45bpd (or 235.7 tonnes in June 2020 to 219.5 tonnes in July 2020).
But as a proportion of total production in tonnes, formation water has increased for three consecutive months. In July 2020, it was 30%, up from 27% in June 2020, 11% in May 2020 and 0.1% in March and April 2020.
Associated gas produced at Horse Hill, which is burnt in a flare at the site, fell in July 2020 to 16.5 tonnes, down from 24.7 tonnes in June 2020, 22.04 tonnes in May 2020 and 22.89 in April 2020.
- Figures for UK oil production are always released three months in arrears. The figures are for oil fields and it is not possible to compare production from individual wells on sites with several wells.