Fall Meet., San Antonio, Tex., Oct 8– Google Scholar. Williams, et al., Williams, B.B., Gidley, J.L. and Schechter, R.S., Acidizing Fundamentals. Matrix acidizing refers to one of two stimulation processes in which acid is injected into the well penetrating the rock pores at pressures below. Stimulation by acidizing is an old production enhancement technique dating as far . B.B. Williams, J.L. Gidley, and R.S. Schecter, “Acidizing Fundamentals”.

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Acid stimulation

Treating an undamaged sandstone well with matrix acids does not usually lead stimulation unless the reservoir is naturally fractured. CaF 2 and AlF 3 can also precipitate in the spent acid. Wormholes are small, continuous channels formed by acid preferentially enlarging pores in carbonate, usually around 2 to 5 mm in diameter. Tags What are tags? Mange other additives can also be used, such as clay stabilizer, fines fixing agent, antisludging agent, demulsifier, scale inhibitorH2S scavengerdrag reducer, foaming agent, etc.

This single fundamntals in Australian Capital Territory: The objective of matrix acid stimulation in carbonate matrix is to allow the acid to dissolve channels to create wormholes in the near wellbore region, reaching as far as possible into the formation.

On back production, the diverter is removed from the formation. In high temperature applications, HCl does not fudnamentals acceptable stimulation results due to its fast reaction that leads to lack of penetration.

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A fundamentalw diversion technique is critical to place the acid to the location where damage exists. Migration of these particles fines into the pores of the near-wellbore area can reduce production and they will not dissolve in strong acids such as hydrochloric acid, but will dissolve in hydrofluoric acid HF. Matrix acidizing is used primarily for damage removal, while fracture acidizing is used to enlarge the effective wellbore by creating an acid-etched fracture deep into the wellbore for relatively low-permeability formations to improve well productivity several-fold.


Treatment design and planning are often performed to ensure that acixizing acid is placed across the entire interval. This process enlarges the natural pores of the reservoir which stimulates the flow of hydrocarbons. These are two distinct and different purposes, the field applications and results of which are often merged or confused.

Matrix acidizing

Although highly corrosive, HF is classified as a weak acid due to its low ionization in water and it is very toxic. For sandstone findamentals acid stimulation, the resulting permeability improvement peaks at certain acid volume and then drops as the volume increases in oil wells, but acdiizing proportional to acid volumes in gas wells.

Other Authors Schechter, Robert Samuel. This single location in New South Wales: Be the first to add this to a list. Physical Description[6] p.

J Pet Technol 45 3: HF, or more usually HF-releasing chemicals such as ammonium bifluoride NH 4 HF 2is used for sandstone matrix acidizing, combined with hydrochloric HCl or organic acids.

Evaluation of acid treatments.

Acidizing Fundamentals – Bert B. Williams, John L. Gidley, Robert Samuel Schechter – Google Books

Skip to content Skip to search. Matrix fundamentalss refers to one of two stimulation processes in which acid is injected into the well penetrating the rock pores at pressures below fracture pressure. The diverter is usually applied in a preflush to temporarily plug the zones of highest permeability zones, allowing the main flush to react with other less permeable or more acudizing zones.

In sandstone acidizing, one has to be particularly careful of reprecipitation of reaction products, which could cause new formation damage [ 7 ].

Penetration is limited by injection rate and volume.

Matrix acidizing –

Leak off control techniques need to be utilized to avoid this. In order to set up a list of libraries that you have access to, you must first login or sign up. In addition, the acid stimulation fluid follows the paths of least resistance and create typically long-branched passageways leading away from the fracture interface, which are called “wormholes”.


Removal of severe plugging in carbonate or sandstone can result in very large increases in well productivity. Home This editionEnglish, Book, Illustrated edition: None of your libraries hold this item.

There are several other ways that acidizing, both for sandstone and carbonate reservoirs, can fundqmentals to formation damage if not carried out correctly. Other areas and formations still suffer from poor acidizing responses, which implies that opportunities for technology development still exist. Please post helpful feedback.

The permeability increase is much larger in carbonate than in sandstone. Lower concentrations can be used as pickling acids to clean up acidizlng well in a preflush to remove scale and rust or an afterflush. Contact Us Subscribe to newsletter How to contribute? Organic acids, like formic or acetic acids, can be used to offer a slower-reacting and thus deeper stimulating acid [ 5 ]. Comments and reviews What are comments?

Login to add to list. Acidizing is used to either stimulate a well to improve flow or to remove damage. Separate different tags with a comma. Acidizing is used to either stimulate a well to greater than ideal matrix reservoir flow or to remove damage.

Matrix acidizing is acidizijg primarily to remove damage caused by drilling, completion, and workover fluids and solids precipitated from produced water or oil i. Stimulation by acidizing is an old production enhancement technique dating as far back as the nineteenth century [ 2 ] when Herman Frasch of Standard Oil patented the use of hydrochloric acid HCl to stimulate carbonate formations.