Well Completion and Operation P2 V0.pdf


Aperçu du fichier PDF well-completion-and-operation-p2-v0.pdf - page 6/68

Page 1...4 5 67868


Aperçu texte


OGIM

Well Completion and Operations

Stimulation
•Acidizing
2. Hydrofluoric acid
- A mixture of 3% HF and 12% HCl,
known as mud acid is used to dissolve
clays and remove mud cakes in sandstone
reservoirs
- mud acid is used exclusively for
sandstone reservoirs with little calcium or
without calcium.
- 10 m3 of 3 % HF acid will dissolve
1.322 t of clay.
MMA

OGIM

WCO -P2_2010 -V0

16

Well Completion and Operations

Stimulation
• Acidizing
3. Acetic acid (CH3COOH) is a weakly
ionized, slow-reacting organic acid.
- Easy to inhibit against corrosion and can
usually be left in contact with tubing or
casing for days without danger of serious
corrosion
- 10 m3 of 10 % acetic acid will dissolve
about 1.862 t of limestone.
- The cost of dissolving a given weight of
limestone is greater with acetic acid than
with HCl acid.
MMA

OGIM

WCO -P2_2010 -V0

17

Well Completion and Operations

Stimulation
• Acidizing
4. Formic acid (HCOOH) is a weaklyionized, slow reacting organic acid.
It has similar properties to acetic acid.
- It is more difficult to inhibit against
corrosion at higher temperatures
- It does not have the widespread
acceptance and use of acetic acid

MMA

WCO -P2_2010 -V0

18

6