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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Acidizing is used to either stimulate a well to improve flow or to remove damage. In carbonate rock, hydrochloric acid enlarges the wellbore or tends to bypass damage by forming wormholes. Add a tag Cancel Be the first to aciidzing a tag for this edition. Evaluation of acid treatments. Be the first to add this to a list.
Although highly corrosive, HF is classified as a weak acid due to its low ionization in water and it is very toxic. None of your libraries hold this item.
Other Authors Schechter, Robert Samuel. J Pet Technol 45 3: Radial penetration is so limited in low-permeability carbonate that it is a better candidate for fracture acidizing. 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.
Treatment design and planning are often performed to ensure that the acid is placed across the entire interval. Injection rates resulting in pressures below fracture pressure are termed “matrix acidizing,” while those above fracture pressure are termed ” fracture acidizing.
During matrix acidizing the acids dissolve the sediments and mud solids within the pores that are inhibiting the permeability of the rock.
There are several other ways that acidizing, both for sandstone and carbonate reservoirs, can lead to formation damage if not carried out correctly. Set up My libraries How do I set up “My libraries”? Login to add to list. Later injected fracturing fluid tend to leak off afidizing the wormholes rather than lengthening the desired fracture.
Matrix acidizing –
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. Found at these bookshops Searching – please wait This single location in New South Wales: In radial flow, wormholes form a dendritic pattern, like the roots of a tree. View online Borrow Buy Freely available Show 0 more links Such a program was developed by Brannon et al.
Penetration is limited by injection rate and volume. Matrix acidizing is applied primarily to remove damage caused by drilling, completion, and workover fluids and solids precipitated from produced water or oil i. To include a comma in your tag, surround the tag with double quotes. We were unable to find this edition in any bookshop we are able to search.
Effective acidizing is guided by practical limits in volumes and types of acid and procedures so as to achieve an optimum removal of the formation damage around the wellbore. 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.
Jennings, “A contemporary approach to matrix acidizing” SPE 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.
When there is no damage present, improper or poorly executed acid treatments can reduce the natural formation permeability and reduce well productivity, as in new wells with low reservoir permeability. A matrix treatment restores permeability by removing damage around the wellbore, thus improving productivity in both sandstone and carbonate wells.
In sandstone matrix acidizing, the primary purpose is to remove acid-soluble damage in the well and near wellbore area.
Acidizing Fundamentals – Bert B. Williams, John L. Gidley, Robert Samuel Schechter – Google Books
Leak off control techniques need to be utilized to avoid this. By posting, you agree to be identified by your IP fundamnetals. Please post helpful feedback. Then set up a personal list of libraries from your profile page by clicking on your user name at the top right of any screen. Although the acid systems used in sandstone and carbonate differ, the same practices apply to both.
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