×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Hydrofluoric Acid
2

Hydrofluoric Acid

Hydrofluoric Acid

(OP)
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

RE: Hydrofluoric Acid

Hydrofuoric Acid is normally produced from a mixture of Fluorospar and Sulphuric Acid and subsequent fractional distillation process. On this basis I would assume HF is not naturally occuring. It is classed as a "weak" highly undissociated acid which will attack glass or silica on contact. It is used for acid fracs when appropriate, depending on the formation type.

Hope this helps..

RE: Hydrofluoric Acid

I spent a summer with Schlumberger-Dowell and we used Hydrofluoric Acid in acid jobs from time to time.  I think it was for wells that had sanded in.

RE: Hydrofluoric Acid

Hydrofluoric acid (HF) is used routinely in sandstone acidizing.  It's one of the staples of the stimulation industries.  However, I have not heard of natural occurances in the wellbore.

RE: Hydrofluoric Acid

HF can used for matrix acidizing or acid fracturing and it used only with sand but with low concentrations in some well it may damage the reservoir. In addition, HF has strong effect on sand and metal that might cause corrosion in drill pipe or coil tubing.

RE: Hydrofluoric Acid

usually hf is used when silicates are present in order to dissolve them

RE: Hydrofluoric Acid

This is often called "mud acid" or "clay acid".  We used it sometimes when we are encountering a real shaly sand with a lot of damage.  Most people try to stay away from it b/c it often causes upsets with the processing system.

RE: Hydrofluoric Acid

hf is mostly used to dissolve silicates however a combination of hf with some acid blends gives good results in elimination of sulphates or other non carbonates deposits which cause a lot of trouble in drilling

RE: Hydrofluoric Acid

Iam sure HF use for sand stone formation

RE: Hydrofluoric Acid

I know of a job coming up where 28% HCL is being pumped into sandface to try and improve skin and productivity.   It is common stimulation fluid.

It is not naturally occuring in fomrations but I'm no expert.

RE: Hydrofluoric Acid

HF acid is most common in "Mud Acid" Packages, depending on the service provider the mud acid mixture can very significantly but commonly a mix of 15% HCL, 5% HF, and corrosion, antislude, and Iron Control additives.  The use of Mud Acid to clean up perforation tunnels immediately after completion is quite common. The key factor in using HF acid in sandstone reservoirs is the timely removal of spent acid.  If the HF acid spends on quartz, and is allowed to remain in the formation the quartz can precipitate out of solution again and form an insoluable product that can be very damaging

RE: Hydrofluoric Acid

Be careful if you use HF. If it contacts your skin it will remove calcium from your bones unless a special injection is administered.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources