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Clamp on Sand detectors
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Source：Internet Author：Unknow Pubdate：2008-04-18
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Kamaldeo (Petroleum)
2 Dec 07 18:25
Appreciate any information relating to the use of clamp on sand detectors on gas producers. FTP is estimated @ 1650psig, reservoir pressure @ 1980ps, choke 30/64"A and separator pressure is 1200psi. Would a sand detector be sensitive enough to prevent cutting out of the choke, or is it that they can only identify the presence of sand. I will appreciate any advice relating to use on these detectors since I have decided to limit production to less than 10mmscfd until I am sure that we can monitor the presence of sand at higher rates. Note I am very cautious because another well sanded up under similar conditions from the same reservoir. These wells are offshore and are not currently gravel packed.
Thanks
Dennis
DrillEng (Petroleum)
11 Dec 07 15:32
字串9
Hello Denis,
Nice problem you have....
Firstly clamp ons will help you and you can get them from either Roxar or ClampOn. They basically measure the noise of a grain of sand hitting the pipe work and then extrapolate this to a volumes.
But these will only tell you when sand arrives.
You have not mentioned how your wells are completed - you said they are not GP'd but are they cased and perforated, screens etc ? Since you have a sand problem in thefield you really should try and exclude the sand down hole.
If you could get a sonic log of the formation from the sub surface team and also a sample of the sand for PSD (particle size distribution)you could easily deisgn a downhole exculsion type. And if someone says its expensive tell them how expensive shutting the well in is....
Failing that, what you can do to limit sand at surface is a very careful bean up of the well. Use a 16/64 choke and flow th ewell and wait unitl you get a sand free rate, then open up again by a 8 /64 and wait unit you get a sand free rate etc etc. 字串8
But since you have seen a sand problem in the field (at relatively small drawdown) you really need downhole sand exclusion.
Dave
Kamaldeo (Petroleum)
17 Dec 07 13:36
Thanks Dave. Please note that both well are casing preforated. One is gravel packed while the other is not. I need to produce these wells to supplement gas lift pressures. I intend to place these clamp on detectors and establish sand free rates. I will then proceed to evaluate the use of a non rig activity that should afford some amount of sand control. Possible resin and re perforate.
Thanks again
Dennis
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