Prabhat/   The first question to ask is what is the drilling installation being used to drill this well?!  This is rather am important issue and here is one case in point to exemplify this...

A number of years ago I was on 1st generation single activity medium water depth monohull drillship in the Campos Basin, with station-keeping capability supplied by Class 1 Dynamic Positioning.  On our horizon was a 2nd generation DP stationed semi-submersible, drilling in the same field. Our respective chief engineers were chatting by radio on a daily basis and we discovered that the semi submersible was burning 4 times the quantity of diesel fuel per 24 hours that we were!!

So, the point about the above case is if you're drilling off a floater and the floater is entirely dependent on Class I, II or III DP,  then you're are very much at the mercy of the prevailing metocean & through-water column sea states which directly impact the overall rig fuel consumption on the 24 hour basis.

I would remark that the most economical fuel consumption would be a high specification jack-up (bottom-supported) drilling installation, drilling in benign conditions, not HP or HT and a straight-forward normally pressured well with a solid drilling programme based on substantial previous history from the same field.

Hope this helps some !!

i completely understand what you are trying to say Mr.paul. as we know to drill a well in onshore or offshore we required rotational motion of bit,which accomplished by rotary system used in drilling,alongside we require drilling fluid pressure.For all these things we require power to operate equipment.these power is generate by using diesel engine.so i need to know 24 hr fuel consumption w.r.t. depth.can we generate a analysis for this  

Prabhat

You need to talk to someone in drilling operations (I am a well control specialist and subsea engineer, hence in no way directly connected to your exacting question(s)!!

Rigs publish their consumption of all drilling consumables which includes water, fuel, chemicals etc.  this is detailed in a morning drilling report from each rig,  You need to get hold of a copy of a drilling report from a rig of your interest !

Try main drilling contractors (Aberdeen...)

See http://texags.com/forums/57/topics/2525768. This may give you some idea. However it is a highly complex subject, influenced by a great number of factors

I would be interested to know the diesel consumption per metre borehole. Any suggestions?