Thoughts on Interference testing, connectivity et al..

As the caffeine kicks in, I've attached a case study from the giant Girassol (800+ mmboe) oilfield offshore Angola where the Operator did various tests pre-Field development to understand the reservoir properties namely 'Connectivity' between sands etc. For that one conducts 'Interference' testing done by drilling multiple wells across the field.

www.searchanddiscovery.com/documents/abstracts/2004intl_cancun/extended/A91143.pdf

DickyH from Cairn in their May CMD & Aug HY chat, talked abt Interference testing & Connectivity during the upcoming program.

Simply put what that means is, if u have a Reservoir that extends for 11-12 kms north-south & is targetted by 3 wells at equal spacing (ie 5.5kms north from SNE2 to deeper sand at Bell#1 not the top 'younger' Sand and 6.6 kms south from SNE-2 to SNE-3) then one leaves behind acoustic gauges to collate the pressure data & suss out if there's any drop out or not. This also helps in planning of Future water injector wells over the fringe of the field.

Attached is the X-section frm Cairn's preso for the SNE field running NW-SE.

It clearly shows the blocky sand (S520) getting thicker & the S540 sand emerging above the oil water contact. IMO, these should b tested depending on HC shows etc.

The green bands denote oil zones, where they've collated their MDT findings at SNE-1. The red bands r from the gas zones.

Note how they left the reservoir cased behind the 9" casing !!!!




This connectivity testing & Tracer injection was also conducted at Jubilee where the JV established a 11 kms track from the first 3 discovery wells. For that pls refer Tullow's Ghana CMD preso's from 2008 onwards on their website..

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Kkw,
dont know abt Xmas, i want news in wk-3 nov or from depth of 2400m onwards from the first core interval & subsequent cored data. Then deal with the flow rates etc by wk-4 Dec by my estimates (assuming no 'lost' time or tool failures/mechanical issues). A simply dumbed down version like, cut 20m of core and recovered 98% of it will do to get the good news flowing.

Anyways got to go, keep an eye on MTrf'c Monday noon onwards.  cheers..