How the optimum Volume of Pre flush and overflush in a matrix acidizing is obtained?
Refer to the following book:
Petroleum Production Engineering, 2nd Edition
By: Boyun Guo; Xinghui Liu; Xuehao Tan
Publisher: Gulf Professional Publishing
Pub. Date: February 10, 2017
@ Hasan Alsaedi
i mentioned it, but it doesn't explain about the volume of preflush or overflush.
only explain about acid volume.
in te case of sandstone wells:
Wells should be put on production immediately after the treatment. In that case,
the afterflush volume should be at least the same as the main HCl/HF volume.
When wells have to stay closed in for some time (which is not desirable), the
afterflush volume should be at least twice the HCl/HF volume to displace the
reaction products to a distance where their influence is negligible (3 to 5 ft
radial penetration). A large overflush is necessary to prevent the near-wellbore
precipitation of amorphous silica. At formation temperatures of 95 °C or higher,
amorphous silica precipitation occurs when the mud acid is being pumped into
the formation. The precipitate is somewhat mobile at first, but may set up as a gel
after flow stops. If it is kept moving by overflushing, it is diluted and dispersed far
enough from the wellbore to where it has a less harmful influence.
in the case of carbonate?
- Badges
- Science topic
- Similar topics
- Mathematics
- Algebra
- Matrix