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Fracture Stimulation Immediate Increase In Pressure, page-14

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chillam

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25/06/14

10:49

Post #: 13568502
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Originally posted by mandurah ↑

Hardly any movement on the LSE as we speak {midday London time} 7.15p ~13c ASX.

I think a lot are waiting on successful post frac milling operations, the major impediment
to 76H being successfully flow tested. As Ann states ; Cambay-77H has a modified completion with cemented 4 ½ inch production casing to minimise risk associated with post-frac milling operations.

I also appreciate the care taken on perforating the 1st zone ; "During the Stage 1 “toe prep”, a pressure increase of approximately 800 psi was detected at surface immediately after the initial Stage 1 perforation, confirming successful access to the reservoir. A steady rise in pressure was observed and, as a "PRECAUTION" , flow-back equipment was rigged up to the frac tree while coil tubing operations continued". A careful as you go approach once again, we don't have cowboys running the show this time around. I think the evidence bears this out at this stage.

"As previously reported, Cambay-77H intersected the primary reservoir target (Y Zone) on prognosis. A comprehensive suite of logs has been acquired and interpretation confirms the wellbore encountered a significant sequence of hydrocarbon-bearing reservoir similar to Cambay-76H. The Cambay-77H logs also compare favourably to the Cambay-73 vertical well, which produced from the Y zone at ~1MMscfd (plus condensate and is located approximately 1 km from Cambay-77H".This statement is not new re :"The 73 vertical well producing at 1MMscfd." In other shales in the US as I have previously alluded to, vertical wells in the same basins that were later fracced {usually 8-20 stages}, produced 10-50 bopd usually. Flow after fraccing
was anywhere between 100-1000 bopd. Usually in the vicinity of a 10-20 times flow rate after fraccing, depending of course on
the number of fracs and techniques used and the quality of the basin. Now, 1MMscfd {plus some oily stuff as well} from 73 is hardly commercial. We would be aiming for about 6MMscfd from 77H I would say to make it commercial. So about 6 times that of 73 vertical. At a rate of 6Mscf to 1boe, 73 would have flowed at 166 bopd. So, 6MMscfd for 77H would be a great result. The 4 stage frac however is not an 8 or 15 stage frac, so a lesser outcome would be expected. Even at 3MMscfd or 500 boepd would be a fair result imo for just a 4 stage frac operation. Getting a bit ahead of myself but this is what I would be expecting as base case flow rates.

Remembering that 76H WAS successfully fracture stimulated, it was post milling operations that killed it.
Less coil to pull out this time and cement casing in place at well head to avoid repeat on 76H. Look forward to completion
of these 2 critical phases to facilitate a flow test.

Easy as You go RM.

GLTAH

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mandurah - thanks for your thoughts on flow rates. Exactly the good oil that we need at this time - you're reading my mind again you crafty old so'n'so. Spot on and big TUs.

So, if I've got you right, a result somewhere for 77H of between 3 MMscfd (500 boepd) to 6 MMscfd (1,000 boepd) with our 4 stage frac would be an acceptable result at this stage, ideally around 6 MMscfd - and comparable to similar shale basins in the US where 8-20 stage fraccs resulted in 100-1000 bopd.

OEX Price at posting: 13.0¢ Sentiment: Buy Disclosure: Held
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