Its Ok to fail but don't accept being second best.
Joined: Jun 2003 Gender: Male Posts: 197 Location: Scotland
MPD in HPHT transition and reservoir zones? « Thread Started on Sept 19, 2009, 7:17am »
Bottom line in a typical HPHT well.
Is that it takes 25-40days to get to 14,000ft (the transition zone)
Then another 30-60-90days to get to a TD of 16,500ft.
Why it takes so long, well we take forever to sense-check the well, make a connection, trip etc in conventional open system wells?
MPD therefore seems to be the obvious answer to stay in control all the time and speed things up to reduce well time and costs significantly , far more safer 9in my view).
If it was my money that was being wasted? I know what I would be seeking to implement. Thus as I believe this has/is being done in certain regions?
Anyone that can give me a lead to explicit examples that I can use as ammunition to those that are very difficult to convert?
Re: MPD in HPHT transition and reservoir zones? « Reply #1 on Sept 21, 2009, 11:43am »
I am used to have a well specific HPHT well control manual with HPHT procedures. The strict HPHT procedures are followed until the reservoir is penetrated. When the well is considered stable and one trip is carried out using HPHT procedures without any problems it is possible to apply for exemptions to the strict procedures. A system is in place where the onshore organization prepare, document and apply for the exemption. Then the offshore (rig) and rig manager ontractor also has to agree and sign out the exemption. Example: reduced tripping procedure, more than one pump off event, etc, first logging run wil contain radioactive sources etc
Its Ok to fail but don't accept being second best.
Joined: Jun 2003 Gender: Male Posts: 197 Location: Scotland
Re: MPD in HPHT transition and reservoir zones? « Reply #2 on Sept 28, 2009, 8:38pm »
Understood kasol, and when drilling conventionally on such HPHT wells?
What normally happens every time you make a connection? i.e. where facts are you 'pressure cycle' the well by several hundred psi's every time the pump is put on and off and exposing yourself to the greatest two risks that exist i.e. 'swab and surge'
What do you think the swab and surge effect is downhole when you move, rotate pipe etc in a conventional system on an HPHT well in a very narrow pressure regime?
How long do you then take finger printing the well on a typical connection?
What is considered normal drilling, connection gas levels that may peak to 2-5-10-20% at the shaker header box on a conventional connection on bottoms up, that you have to circulate via the chokes with the BOP's shut in as per standard HPHT procedures etc?
Here too many well records and mud logs state how today's decision makers end up 'weighing up' then loosing and gaining more 'for what ever reason' that then looses hrs, that turn in to days and weeks on these well?
What then was the direct cause of such lost time events?
What corrective actions are thus needed to eliminate such problems is what we then need to be resolving?
Where such risks and too often consequential loss can be removed when you go to a 'closed in system' and take control of the pressures to a more constant-pressure-regime thereby can exercising far greater management and safer control of the well?
What results should be far less time spent on these sections.
Re: MPD in HPHT transition and reservoir zones? « Reply #4 on Oct 12, 2009, 1:27pm »
KD, don get me wrong. I fully support and see the advantages to the MPD system in narrow mud window wells. But not all HPHT wells requires MPD and the one I have drilled so far we have managed fine without it. I am however drilling a well now with a new rig, a really narrow mud window and I wish I had a MPD system on this one.
Joined: Mar 2003 Gender: Male Posts: 182 Location: middle east/Asia & uk, Spain
Re: MPD in HPHT transition and reservoir zones? « Reply #6 on Oct 15, 2009, 4:22pm »
MPD +ECD subs on top of the stand this allows continues circulation at all times even on making connection maintaing ECD.Hence lower mud weights required. MPD make sure the rig is centered you may have read my previous post. Land rig so unable now to center big problem with RCD elment wear. Once crews familiar with MPD they like it.
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