Brockham side track well – commence work on the BR-X4Z well
Surrey oil site get’s final approvals
Angus Energy(LON:ANGS) operator commence work on the BR-X4Z well on UK onshore Production Licence PL 235. The rig is now on site and has started work on the approved program.
Jonathan Tidswell-Pretorius, Angus Energy’s Chairman, commented:
“We are pleased to have received the required approvals from the UK Government to perform the new work. We have commenced with the abandonment of the required redundant wells in the upper Portland formation before re-entering the original Brockham-X1 well that BP drilled in 1987 down through the Portland, Kimmeridge, Corallian and in to the much deeper great Oolite formations. All the original BP wells at Brockham that passed through the Kimmeridge and Corallian formations were drilled without properly assessing their hydrocarbon potential. Angus Energy looks forward to update the market with the results of the assessment in due course”
The other two companies involved in the Weald Basin
Doriemus PLC (LON:DOR) Doriemus owns a 10% direct interest in the Brockham Oil Field which is held under UK Production Licence PL 235.
David Lenigas, Executive Chairman of Doriemus Plc, commented:
“I’m very pleased that Angus have managed to get the required approvals from the UK Government to perform this new work at Brockham and that they have already started operations on this exciting project ahead of the end of the 2016 calendar year. Doriemus looks forward to reporting the results of this very important oil exploration well for Brockham and the wider Weald Basin in due course.”
Alba Min Res PLC (LON:ALBA) , Brockham Oil Field (“Brockham”), in which Alba is earning a 5 per cent interest. Brockham is located near Gatwick Airport and is only a few miles from Alba’s other UK onshore oil and gas interests at Horse Hill.
George Frangeskides, Executive Chairman of Alba, commented:
“We are very pleased that Angus have now obtained the required approvals from the UK authorities and have already started on this potentially very significant work at Brockham. Alba looks forward to reporting the results in due course.”
Share Talk has previously covered Angus Energy a small company with a bright future with an over view of the operator and what investors can expect from the up and coming Brockham Oil Field (“Brockham”) drill.
David Lenigas talking to one of the Share Talk team today
Angus Energy the operator could be looking at a time frame of only around 3-5 day drill with the well already cased, the first target zone being so shallow.
We are hearing new concrete foundations have been poured so it is looking more likely a new foundation/pad is being used for the drill rig on site.
Source: ProactiveInvestors Stocktube
Published on Nov 14, 2016; Angus Energy (LON:ANGS) made its AIM debut Monday having raised £3.5mln and is a junior with some big plans.Proactive’s Andrew Scott recently caught up with managing director Paul Vonk from the firm, which has interests in two recently producing oilfields in southern England.
The company said in a statement it had received approvals from the Oil and Gas Authority and the Health and Safety Executive to start operations on the well, to be called BR-X4Z.
In drilling the side-track at Brockham, Angus will drill the Portland sandstone zone, host to a known oil play that is already generating 35 barrels a day. The Kimmeridge is the main target to prove on Brockham, if the geological structure replicates the well at Gatwick (Horse Hill-1) that produced 1,688 barrels a day.
Source: Xodus Group Ltd (“Xodus”)
No one is saying that Brockham will have identical geology to Horse Hill – but one of Angus’ partners, Doriemus, have commissioned the consultant Nutech to make a comparative analysis of the Horse Hill-1 well and Brockham-1, sunk by BP back in 1987.It is too early to definitively assert this, but Angus believes the maturity and fracture analysis of the two have striking similarities.
‘We know we have these limestone layers, they appear to be naturally fractured and the maturity is slightly better than Horse Hill,’ says Angus managing director Paul Vonk.
Something else to take into consideration when looking at Weald Basin; Brockham is permitted for production with three wells already drilled. So, unlike Horse Hill, it could be put onto production immediately as it has already produced from previous drills.
The Brockham oil field
The Brockham oil field is located on licence PL 235 in Surrey (see below) which covers 8.9 km2 (3.44 square miles). The field was discovered by BP in 1987 with the drilling of the Brockham-1 well. Angus Energy currently holds a 55% interest and operatorship of the licence.
The field has been shut in since late February 2016 in order for the completion of surface upgrades to make the production facility compliant with future regulatory requirements and to prepare the site for future drilling activity. Prior to shut-in, the field was producing approximately 20 bopd from the Brockham-2Y well over 2015. The field produces from a historically drilled off-structure well where production is realised via an acidized pathway through the overlying limestone reservoir seal. This suboptimum solution is the primary rationale behind Angus’ strategy to drill a side-track well to the BR-X4 well to target the crest of the Portland Sandstone reservoir and access significantly greater volumes of oil. This well will be termed BR-X4Z.
Current equity partners in licence PL 235
|Angus Energy (operator)||55%|
|Brockham Capital Ltd (BCL)||10%|
Source: Angus Energy
Existing production reservoir – the Portland interval
The current producing reservoir of the Brockham field is in the Upper Jurassic Portland Sands, a common reservoir type in the Weald Basin. The fine grained sands were deposited in a shallow marine shelf environment and are composed of a sequence of four regressive and transgressive cycles. The cycles are separated and defined by minor flooding surfaces.
Correlation in the Portland Sandstone
Source: Xodus Group Ltd (“Xodus”)
Portland drilling history
Brockham has had several wells drilled on the field. The first well, BR-X1, originally targeting deeper formations, was worked over to allow production from the Portland Sandstone shortly after the original discovery. Initial production from the well was 95 bopd with only 5 bbls of associated water and associated gas.
Further wells and side-tracks were drilled after 1988. These include BR-X2, BR-X2Z, BR-X2Y, BR-X3 and BR-X4. A horizontal well, BR-X2Z was also drilled on the field. These wells, although geological successes, encountered technical problems due to limited formation information available at the time. Openhole completions on the horizontal wells combined with water fractures resulted in these wells being unable to produce for a prolonged period from the targeted zones. The BR-X4 well did penetrate the 4.2 unit within the Portland and showed the best permeability and porosity. However, the horizontal well passed through a fracture connecting to higher pressure water zones beneath.
Acquisition by Angus Energy
Angus Energy acquired the Brockham field in 2012 and started a programme of logging the old wellbores. The company also acquired and reprocessed an additional 46 km of seismic across the field. A field remapping study was then undertaken and a new Field Development Plan was submitted to the government’s Oil and Gas Authority (OGA).
To date, Brockham has produced approximately 230,000 barrels of oil. Based on the company’s additional analysis and better understanding of the formation, reservoir, high pressure water zone and fractures, Angus believes that there is major production upside potential to be derived from completing a relatively simple up-dip side-track mirroring the BR-X1 well. This would target the 4.2 unit at an angle of approximately 30 to 40 degrees and stay away from any problem-causing fractures.
A working petroleum system
The Weald Basin is a proven petroleum system with several commercial producing fields and discoveries, mostly on the flanks of the basin. Since a raft of modest discoveries in the 1980s, there has been modest yet steady production from oil fields including Horndean, Singleton and Storrington as well as Lidsey and Brockham as discussed in this report. There are also several gas field located towards the central area of the basin. These fields are evident on the map below.
Oil (green) and gas (red) fields of the Weald Basin and the wider region
Source: Alba Minerals
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