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Sorry folks, I have just found out that we have changed the material that we are goingto use to 174 ph stainless steel. Thanks, John

Dear All, I am going to be working with some Ra 226 and I need to put some shielding in place. Does anyone have a figure for the thickness of 4140 steel needed to half the counts? Thanks, John

Can anyone point me in the direction of a clear and concise definition of what the difference is between zone 0,1,2 and safe in terms of distance from the well head and other variables? Thanks, John

Hush (and everyone else) I have found out from another source in the Coiled Tubing industry that HF is used as an acidiser to clean out perforations and such like and that it is not naturally occurring in a well bore. Thanks for everyone’s input. Regards, John McGrath

Dear All, Does anyone know if Hydrofluoric Acid is used in any well bore treatments such as acidising, or is there any way that it can be naturally occurring in a well bore? Regards, John McGrath

Thanks for all the info guys. I was origionally asking if HF could be naturally occurring in an oil well and it seems that the answer is no. The reason is that I have been testing a new product for corrosion resistance against CO2, H2S and other chemicals that can occur downhole at 200C and...

Guys, Thanks for the tips. John

Dear All, I am testing out new materials for a project that I am working on and I have just been asked it they will stand up to attack by Hydrofloric Acid. From what I can tell there is very little that can stand up to this acid, but I need to know more about it first. Where does it naturally...

Dear All, Does anyone have any experience in how a composite rod (aramide or carbon with a poly or epoxy resin) of about 4-6mm diameter will behave when exposed to explosive decompression. And when I say explosive decompression I mean from 10K psi to atmospheric in well under a second. It...

Austin, I downloaded the ProjeX freeware and was impressed enough to get the full blown module for $20. The freeware version is so limited that it is usless. It’s excellent! It offers basic time line tracking in the form of Gantt charts that can be at what ever time scale you like (within...

I have actually managed to put together an excel spread sheet that does update dates and creates a Gannt chart very similar to MS Project as well as colour coding everything. Oh the power of 'IF', 'AND' functions combined with conditional formatting! I will still check out the freeware version...

Guy, It's Excel that I'm using just now, but whenever you change a time it does not update the rest of the items. My boss certainly seems to think that $600 is expensive for MS Project so I'll have to keep looking around. Thanks, John

Hi All, I have recently changed companies and I no longer have access to MS Project to plan my projects. It is a small company with short term projects and they don’t have, or want to purchase, MS Project. Does anyone have any details of other (cheaper) software packages that I could use...

Pardal, The shielded wire that you mention is available from several different suppliers and this is what has been used for 30/40 years in the oil field applications that I am looking at. There are several inherent problems with this design and the solution that I am looking for (i.e. a smooth...

Pardal, Teflon will not take the extream abrasion that I need for this application. Thanks, John

I am looking for some feed back on explosive decompression on glass fibre, aramide and carbon fiber wires. I have several different types of wires made up of the above materials all around 4mm diameter. I have to test them for explosive decompression from 10,000 psi in a gas and I was...

Guys, The metal that is going to be coated is a 0.108” strand of carbon steel wire that will be lowered in on oil well for 18,000 ft and then pulled back out again several times. The bottom hole temperature can get up to 400F as well as having various chemical such as H2S and CO2 down there...

Rubber coating will not work as it is going to be exposed to temperatures of up to 400F. I expect the solution (if there is one) will either be ceramic/enamel or some sort of plastic. I just need some help in finding the right one. Thanks anyway, John

A ceramic might work, but it would have to be able to achieve a bend radius of 400mm and maintain electrical isolation. Do you have any suggestions on where I can find out more about this? Thanks, John

Dear All, I am looking for a material that will bond to carbon steal to create a coating what will be very resistant to abrasion and will insulate the metal electrically. Does anyone have any suggestions? Thanks, John McGrath