The document defines acidizing as pumping acid into a wellbore to remove near-well formation damage and other damaging substances, enhancing production by increasing the effective well radius. It then describes various types of acidizing treatments including acid fracs, acid jobs, acid stimulation, matrix acidizing, and matrix stimulation. These involve using reactive acids like hydrochloric acid to dissolve substances in sandstone and carbonate formations, enlarging pore spaces and improving permeability to enable enhanced production of reservoir fluids. The treatments are performed below fracture pressures to penetrate formations without damaging them.

1. ACIDIZING
Group VII

2. Group Members
 Ahsan Umar PE-02
 Anum Haroon PE-14
 Iftikhar Zaidi PE-43
 Faisal Noor PE-46
 Muhammad Osama Yousuf PE-49

3. Definition
 The pumping of acid into the
wellbore to remove near-
well formation damage and other
damaging substances. This
procedure commonly
enhances production by increasing
the effective well radius. When
performed at pressures above
the pressure required to fracture
the formation, the procedure is
often referred to as acid
fracturing.

4. Types of Acidizing
 Acid frac
 Acid job
 Acid stimulation
 Matrix acidizing
 Matrix stimulation

5. Acid frac
 A hydraulic fracturing treatment performed
in carbonate formations to etch the open
faces of induced fractures using
a hydrochloric acid treatment. When the
treatment is complete and the fracture
closes, the etched surface provides a
high-conductivity path from
the reservoir to the wellbore.

6. Acid job
 The treatment of a reservoir formation with
a stimulation fluid containing a reactive acid.
In sandstone formations, the acid reacts with
the soluble substances in the
formation matrix to enlarge the pore spaces.
In carbonate formations, the acid dissolves the
entire formation matrix. In each case, the
matrix acidizing treatment improves the
formation permeability to enable
enhanced production of reservoir fluids. Matrix
acidizing operations are ideally performed at
high rate, but at treatment pressures below
the fracture pressure of the formation. This
enables the acid to penetrate the formation and
extend the depth of treatment while
avoiding damage to the reservoir formation.

7. Acid stimulation
 The treatment of a reservoir formation with
a stimulation fluid containing a reactive acid.
In sandstone formations, the acid reacts with
the soluble substances in the
formation matrix to enlarge the pore spaces.
In carbonate formations, the acid dissolves the
entire formation matrix. In each case, the
matrix acidizing treatment improves the
formation permeability to enable
enhanced production of reservoir fluids. Matrix
acidizing operations are ideally performed at
high rate, but at treatment pressures below
the fracture pressure of the formation. This
enables the acid to penetrate the formation and
extend the depth of treatment while
avoiding damage to the reservoir formation.

8. Acidize
 To pump acid into the wellbore to remove near-
well formation damage and other damaging
substances. This procedure commonly
enhances production by increasing the effective
well radius. When performed at pressures above
the pressure required
to fracture the formation, the procedure is
often referred to as acid fracturing.

9. Matrix Acidizing
 The treatment of a reservoir formation with
a stimulation fluid containing a reactive acid.
In sandstone formations, the acid reacts with
the soluble substances in the
formation matrix to enlarge the pore spaces.
In carbonate formations, the acid dissolves the
entire formation matrix. In each case, the
matrix acidizing treatment improves the
formation permeability to enable
enhanced production of reservoir fluids. Matrix
acidizing operations are ideally performed at
high rate, but at treatment pressures below
the fracture pressure of the formation. This
enables the acid to penetrate the formation and
extend the depth of treatment while
avoiding damage to the reservoir formation.

10. Matrix stimulation
 A sandstone matrix stimulation treatment
is generally composed of a hydrochloric
acid [HCl] pre flush, a main treating
fluid (HCl-HF mixtures) and an over
flush (weak acid solution or brine). The
treating fluid is maintained under
pressure inside the reservoir for a period
of time, after which the well is swabbed
and returned to production. In carbonate
reservoirs, HCl is the most common fluid
used. Organic acids such as formic
and acetic acid are used in either
sandstone or carbonate acidizing, mainly
in retarded-acid systems or in high-
temperature applications.