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http://www.southampton.ac.uk/~imw/Petroleum-Geology-Weald-Shale.htm

4. Oil or Gas Reservoir Improvement by Hydraulic Fracturing.

This is a case of going to a conventional oilfield, like those around the western Weald (see them from the maps), not a place with "cooked" oil shale. The reservoir rock (the Great Oolite limestones and dolomites), which is already providing some oil, is further fractured (in addition to natural fracking) by high pressure fluids to greatly improve the porosity and permeability. Thus much more oil and gas can come out. This is not shale-fracking; it is unlikely to cause much public protest, and you will not know where it is happening. The well sites are already there, very concealed and apparently operating normally. It is unlikely to cause environmental problems, but it can involve a very large increase in water-injection. In the future this may be so commonplace as to be a "conventional" procedure. It could happen at almost any wellsite on a small scale or on a large scale. This is not "shale gas fracking" and probably will not concern the public. It is not confined to the area of heated rocks in the western Weald.

5. Horizontal drilling.

This is now common, with horizontal wells of more than 11km length extending under such places as the expensive Sandbanks Peninsula in Dorset, without trouble or objection. It has been taking place for many years in Dorset, but not commonly in the western Weald area. There is already short horizontal well at the inconspicuous oilfield at Storrington, but this has no environmental relevance. For a long time a deviated well or wells at Singleton have abstracted oil or gas under the region of the village from about a mile away; this is normal procedure though, and not a truly horizontal well. It has caused no objection and there is no reason why it should.

In the future, horizontal drilling in Sussex is bound to happen on an appreciable scale, whether for conventional reservoirs or for shale oil. The Kimmeridge oil shale at Balcombe and elsewhere in the region is at surprisingly shallow depth, at least compared to many American well sites. The horizontal drilling may be at only 600 or 700 metres deep (not several kilometres). The reason for this is that the oil shale was deeply buried in Cretaceous times and has since been uplifted to fairly shallow levels in the western central Weald. The shale is rather cool now, but it has undergone the "cooking" in the past. This uplift of a former basin is known as an "Inversion Structure". There are two in the south of England. The other one is offshore, southwest of the Isle of Wight (the Portland - Wight Basin or English Channel Inversion Structure).

How much % of oil will be recoverable across the Weald......perhaps ultimately, every drop, through hydraulic water injection.....this procedure has been carried out at Wytch Farm ever since the oil reserve went into decline from its peak 110,000bopd, and no doubt was the reason for $200m acquisition of Premier Oil's 33% in September 2017 which equates to $200m for c5000bopd from the c15,000bopd Wytch Farm produces today....which gives a very strong indication of Ukog's potential value with the prospect of so much oil....Ukog have no such plans for hydraulic water injection, but ultimately if it's ok at Wytch Farm then it will be ok else where...home grown energy security is top priority for UK Plc with the North Sea reserves now in serious decline, and with Brexit looming, Theresa and co will be keen to extract as much oil as viably possible. Gla ;-)

The Telegraph 2016

Wytch Farm in Dorset is in the heart of an Area of Outstanding Natural Beauty. But you would be forgiven for not knowing the largest oilfield in western Europe is even there.

Nestled in a pine forest near a nature reserve and on islands off Poole Harbour, the oilfield owned by French company Perenco has been quietly producing thousands of barrels a day since the late 1970s, by means of a form of fracking called 'water injection', also known as 'water flooding'.

At one point the oilfield had the longest horizontal drill in the world and has regularly pumped water into wells to fracture the rock and force out oil and gas.

Academics say that this so-called fracking has been used on 200 wells across the UK over the last 20 years or so.

In contrast, the local community around Wytch Farm appear relaxed about the "discreet" operations happening in the heart of their community.

Tony and Kate Bryan, both retired, from Corfe Castle, the village two miles north of the oilfield, have been on one of the visits to Furzey Island to see the oil refinery in action.

Mr Bryan said occasionally you see a drilling rig poking above the trees or a nodding donkey on the coast but most people do not know it is there.

We have never had any seismic impact that we are aware of and you have to get your oil from somewhere.

It is all very well saying not in my backyard but it has been very well done.

Most of the tourists eating ice creams and wandering around the National Trust castle were unaware that fracking is going on around the corner.

It certainly does not seem to have affected property prices. In Poole, which looks out on the main offshore activities of Perenco, properties go for millions. Purbeck Property, the local estate agents, said the proximity of an oilfield has not had an adverse effect yet.

C'mon England, C'mon Ukog...this is the time....Perfectly Poised for Greatness!!! Gla :-) Let's do it again, gla holders....Flow test update fast approaching. :-) ‘Outstanding’ oil flow produced by Gatwick Gusher Studies have suggested that there are reserves of around 10 billion barrels under Horse Hill Nick Goodway Tuesday 22 March 2016 02:08 The Independent Online UK Oil & Gas’s Horse Hill 1 site at Horley, near Gatwick airport in Surrey ( Bloomberg ) The Gatwick Gusher has produced the highest flow rates of any onshore wildcat well in the UK, matching the kind of levels normally seen in the North Sea, its majority owner UK Oil & Gas said. The exploration company said it had completed its final test at Horse Hill, just north of Gatwick Airport, and that the aggregate flow from three layers of oil-bearing rock had been 1,688 barrels per day. “The flow test results are outstanding, demonstrating North Sea-like oil rates from an onshore well,” said UKOG executive chairman Steve Sanderson. “This simple vertical well has achieved an impressive aggregate oil rate equivalent to 8.5 per cent of total UK onshore daily oil production. “We are delighted, therefore, that this discovery has the serious prospect of being a meaningful addition to the UK’s own supply of oil in a period where North Sea production is declining more rapidly than expected.” He said that the final tests, from the Portland sandstone level, had actually been limited because they hit the well pump’s maximum capacity limit. He also said that planned future drilling horizontally rather than just vertically could also significantly increase the rate of flow. UKOG said it had commissioned Nutech and Xodus, oil engineering consultants, to provide estimates of how much oil may be recoverable from the reservoirs. Previous studies have suggested that there are reserves of around 10 billion barrels under Horse Hill. Mr Sanderson said: “These results cause us to rethink and recalibrate many prior geological assumptions. Nutech will now reinvestigate the presence of significant natural fracturing and oil in place figures for both the Portland and Kimmeridge units given that all flow periods produced 100 per cent dry oil.” During the tests the Horse Hill well delivered 1,940 barrels of so-called “light sweet oil” to Esso’s Fawley refinery.

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