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

Matrix acidizing

Physical Description[6] p. Mange other additives can also be used, such as clay stabilizer, fines fixing agent, antisludging agent, demulsifier, scale inhibitorH2S scavengerdrag reducer, foaming agent, etc.

Basically, there are two types of acid treatments that are related to injection rates and pressures. Found at these bookshops Searching – please wait In carbonate rock, hydrochloric acid enlarges the wellbore or tends to bypass damage by forming wormholes.

Although the acid systems used in sandstone and carbonate differ, the same practices apply to both. Gdanski [3] developed a practical model for wormholing during matrix acidizing in carbonates, which shows that practical limits for effective penetration of hydrochloric HCl acid varies from about acidizibg to 5 ft.

Fracture acidizing is to pump the acid treatment above the fracturing pressure of the reservoir rock, which create long, open channels from the wellbore penetrating deep into the formation. It can be used to either remove formation damage or stimulate undamaged formations to produce conductive channels within the fracture where oil and gas can migrate. Be the first to add this to a list.


The maximum rate allowed is a function of the carbonate permeability. More recently, Nitters et al. Skip to content Skip to search. Please post helpful feedback. Author Williams, Bert B. Gas wells — Acidization. None of your libraries hold this item. Fracture acid stimulation is usually carried out on carbonate reservoirs, which have lower permeability than sandstone reservoirs. The successful acid placement in matrix treatments of open-hole horizontal wells is even more difficult due to the length of zone and potential variation of the formation properties.

There are several other ways that acidizing, both for sandstone and carbonate reservoirs, can lead to formation damage if not carried out correctly. Did you find what you were looking for?

Jennings, “A contemporary approach to matrix acidizing” SPE Help to improve this page What’s this? The permeability increase is much larger in carbonate than in sandstone. The effect of damage on well productivity and flow is illustrated in Figs. This single location in New South Wales: They occur mostly if the well is shut-in for a long period of time.

This process enlarges the natural pores of the reservoir which stimulates the flow of hydrocarbons.

Acid stimulation

Matrix acid stimulation is pumped into the formation at or below the fracturing pressure. Removal of severe plugging in carbonate or sandstone can result in very large increases in well productivity. To include a comma in your tag, surround the tag with double quotes. Other areas and formations still suffer from poor acidizing responses, which implies that opportunities for technology development still exist.

The basic chemistry is HF reacts first with aluminosilicates to form fluorosilicates, which react further with clays to form insoluble sodium or potassium flurosilicates.

For sandstone formation acid stimulation, the resulting permeability improvement peaks at certain acid volume and then drops as the volume increases in oil wells, but is proportional to acid volumes in gas wells.


These 3 locations in All: Either mechanical or chemical placement techniques can be used to improve contact of the acid solution with the interval. Matrix acidizing refers to one of two stimulation processes in which acid is injected into the well penetrating the rock pores at pressures below fracture pressure. Fundamenyals acids, like formic or acetic acids, can be used to offer a slower-reacting and acidizimg deeper stimulating acid [ 5 ].

Wormholes are small, fundamentxls channels formed by acid preferentially enlarging pores in carbonate, usually around 2 to 5 mm in diameter. Matrix acidizing is applied primarily to remove damage caused by drilling, completion, and workover fluids and solids precipitated from produced water or oil i.

During matrix acidizing the acids dissolve the sediments and mud solids within the pores that are inhibiting the permeability of the rock. Public Private login e. Conducting the acidizing procedure. Schecter, “Acidizing Fundamentals”, Monograph Series, acudizing. Tags What are tags?

Matrix acidizing –

Image used herein by limited permission with no further use, copying, license, copyright, or other rights extended, with all rights reserved. When there is no damage present, improper or poorly executed acid treatments can fundmentals the natural formation permeability and reduce well productivity, as in new wells with low reservoir permeability. This single location in Australian Capital Territory: In high temperature applications, HCl does not produce acceptable stimulation results due to its fast reaction that leads to lack of penetration.

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