RE: wellwell2 Jun 2018 00:31
Genhis,
"I'm not sure I understand this."
With very good reason, too. Because the message you have quoted is very mixed-up, like the contents of your dustbin were before the tree-huggers got into the act and forced you to have three or more different dustbins outside your door (made out of plastic, by the way).
Essentially it's still all garbage, but by separating it you can find things which might have value, others which you could really throw on the lawn and it would be gone after the next rain-shower, and cartain items which could have been used for pig-swill.
Let's take it apart.
" you need to be able to drill accurately and horizontally to intersect multiple fractures in one well path and do so perpendicular to the fracture network"
Balls. If this were true, how come the DST rsult on the 'pilot well' Seven? It wasn't horizontal. But equally it wasn't drilled as a producer. Drilling horizontally simply maximises well 'exposure' to the formation, ie hitting more fractures. As to 'accuracy' in the case of the Lancaster structure, and if one looks at the seismic and the overall 'matrix' information the company has provided us with, drilling in almost any direction from around the same spot will give the same flow results. To draw blood you don't have to stick the tail on the donkey in the 'right place', just poke that drawing-pin in anywhere...
BUT. To get a licence to drill from the OGA and people like that, you have to have a well plan, and stick to it. And yes, maintaining that trajectory is important. In fact it's a matter of pride for directional drillers. Give 'em a fifty-metre target, they'll be unhappy if they're off bullseye by five. Lancaster isn't the same as some conventional reservoirs, though, where go up or down by five metres or so and your out of the payzone and into the water, or something like that.
" This wasn't possible twenty years ago when basement shows were seen in by Arco etc. They couldn't hit a barn door from straight in front."
Twenty years ago. Hmm. 1998. This is massive slander on Arco, but also technically untrue. I recall working on a well onshore Gabon three years before that where we did an in-country 'horizontal section' of almost 2km.But that was in Gabon. The world record was about three times that. Two decades ago, horizontal drilling was really getting into its stride. But the thing is, the Arco well was strict exporation to look at the sandstones, and 'basement' was not well recognised as being a reservoir in its own right.
" Also the geological modelling tools were in their infancy and understanding of the geology was lacking."
Partly true, though few people were deliberately 'modelling' FB at the time. But the teamwork of DrT & Schlumberger is now second to none.
But as regards the 'understanding'?
".no one believes it-yet"
Says who? Anyone who doesn't is a blithering idiot. A 15,000 bbl/day DST doesn't
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