Well Completion and Operation P2 V0.pdf


Aperçu du fichier PDF well-completion-and-operation-p2-v0.pdf - page 5/68

Page 1...3 4 56768


Aperçu texte


OGIM

Well Completion and Operations

Stimulation
•Acidizing
1. hydrochloric acid.
- A solution of 15% HCl by weight is
most often used in limestone or dolomite
formations,
- 10 m3 of a 15 % hydrochloric acid
solution dissolves 2.21 t calcium
carbonate
- 10 m3 of a 15 % hydrochloric acid
solution dissolves 2.035 t dolomite
MMA

OGIM

WCO -P2_2010 -V0

13

Well Completion and Operations

Stimulation
•Acidizing
2. Hydrofluoric acid (HF) is used on
sandstone reservoirs since it reacts with
siliceous compounds.
- It is employed exclusively in sandstone
matrix treatments to dissolve either
formation clays or migrated clays

MMA

OGIM

WCO -P2_2010 -V0

14

Well Completion and Operations

Stimulation
•Acidizing
2. Hydrofluoric acid (HF)
- Due to fast reaction time and
precipitants (calcium fluoride) HF acid
should never be used in carbonate
formations,
- For sandstone with low carbonate
content, HCL pre-flush is used to avoid
the contact of HF acid with carbonates.
MMA

WCO -P2_2010 -V0

15

5