Oil and gas industry. Acidizing

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Presentation made by excellent trio

2.

Outline for our presentation
I. Introduction on acidizing.
II.Formation type.
III.Conclusion.

3.

What do we call
acidizing?!
The process that involves the injection of chemicals to eat
away at any skin damage, "cleaning up" the formation,
thereby improving the flow of reservoir fluids. A strong acid
(usually hydrochloric acid) is used to dissolve rock formations,
but this acid does not react with the Hydrocarbons. As a result,
the Hydrocarbons are more accessible. Acid can also be used
to clean the wellbore of some scales that form from mineral
laden produced water.

4.

Acidizing background
#1 – 120 years
#2 – 1940’s
#3 – Acidizing nowadays

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6.

Formation type

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8.

9.

Knowing the type of formation being
acidized and details
of its composition (mineralogy) is
critical to achieving
positive results. In carbonate
formations, the acid job
design is typically based on the use of
hydrochloric acid
(HCl). The objective when acidizing
carbonate formations
is to dissolve carbonate based
materials to create new
or clean existing pathways or
channels that allow the
formation fluids (oil, gas, and water)
to flow more freely
into the well.
Hydrochloric acid (HCL) molecule

10. When acidizing

The acid is chemically consumed and neutralized as the target
material is dissolved
The acid is pumped through the coiled tubing and into the
productive formation
When pumping any fluid in a well will have natural tendency to
follow the path with the highest permeability
In all above cases when acid job has been pumped the well starts
production

11. After that

Operator should consider by using separate tanks or
containers to isolate the initial produced fluids
(spent acid and produced water)
It will contain pH of 2-3 approaching neutral pH
Once neutralized, spent acid and produced water can
be handled with other produced water at the production
site

12. Acidizing equipment

13. Cementing & Acidizing Transport (C&A Transport)

Cementing & Acidizing
Transport (C&A Transport)
475 HP diesel engine
Able to mix and pump cements, acid, acid
solvents
Designed and fabricated to extreme weather
conditions

14. Slow Rate Pumping Transport

Combines low rate pumping with ability to transport tubing rotation
Positive displacement triplex pump
Pre-charge fluid transfer pump
Water heater tank for controlled fluid temperature
Tubing rotator
Pressure valve for safety
Improves first attempt operations
Lowers slurry volumes
Reduces time on location
Increases cost savings

15. Stimulation Pumping Transport

High pressure mixing and pumping abilities
932 kW (1250 HP) pumping and complete mixing
12 cylinder diesel engine
Heavy 5 speed automatic transmission
745 kW (1000 HP) input rated pump
Real-time web and data display
Programmable pressure shutdown
Dedicated stimulation service equipment

16. Conclusion

As already mentioned, the oil and gas industry has been using
acid treatment for well over 100 years
As a result, the industry has a great experience with safe handling
and managing these fluids before and after their use
Today, acidizing is one of the most widely used processes for
stimulating oil and gas wells