You must log in to edit PetroWiki. Help with editing

Content of PetroWiki is intended for personal use only and to supplement, not replace, engineering judgment. SPE disclaims any and all liability for your use of such content. More information

Message: PetroWiki content is moving to OnePetro! Please note that all projects need to be complete by November 1, 2024, to ensure a smooth transition. Online editing will be turned off on this date.


PetroWiki

PetroWiki
Jump to navigation Jump to search


Welcome to PetroWiki
Wiki, powered by SPE membership with all things related to the petroleum industry.
4,098 pages in English

Featured article


Vol4prt Page 350 Image 0001.png

Acid fracturing

Designing an acid-fracturing treatment is similar to designing a fracturing treatment with a propping agent. Williams, et al presents a thorough explanation of the fundamentals concerning acid fracturing.

The main difference between acid fracturing and proppant fracturing is the way fracture conductivity is created. In proppant fracturing, a propping agent is used to prop open the fracture after the treatment is completed. In acid fracturing, acid is used to “etch” channels in the rock that comprise the walls of the fracture. Thus, the rock has to be partially soluble in acid so that channels can be etched in the fracture walls. As such, the application of acid fracturing is confined to carbonate reservoirs and should never be used to stimulate sandstone, shale, or coal-seam reservoirs. Long etched fractures are difficult to obtain, because of high leakoff and rapid acid reaction with the formation. Acid fracturing works more effectively near the wellbore. Acid reacts with the small grains (which prevents the flow of fluid from the formation to the wellbore) and dissolves it into small particles.

There are several unique considerations to be understood when designing acid fracture treatments. Of primary concern is acid-penetration distance down the fracture. The pad fluid is used to create the desired fracture dimensions. Then the acid is pumped down the fracture to etch the fracture walls, which creates fracture conductivity.

What is PetroWiki?


PEH all.png

PetroWiki was created from the seven volume Petroleum Engineering Handbook (PEH) published by the Society of Petroleum Engineers (SPE). PetroWiki preserves the PEH content in unaltered form (page names that start with PEH:), while allowing SPE's membership to update and expand content from the published version. Pages that do not have PEH: at the beginning may have started with content from the PEH, but have been modified over time by contributors to the wiki. Disclaimer

Start your first page here!


Start creating your first article by logging in and using the search box to look for the topic of your choice. We recommend using the title of a page you would like to create in the search box. If the search does not return any relevant pages, you will be asked to start a new page. You can click on the red link and it will open a new page with you title to begin. Add your content and remember to save!

Unlike some other online wikis, PetroWiki content is copyright SPE. For information about using content from PetroWiki, see PetroWiki:Permissions.

Helpful links


Edit toolbar

How to add inline references and auto numbered reference section

How to create a quality topic page


How can I contribute to PetroWiki?


PetroWiki is a living document and therefore the content should be enhanced to include newer technologies and current information.

Share your knowledge with others and help update PetroWiki at the same time! You can't "break" the wiki.

Follow these basic steps to get started:

  • Log in
  • Search for the topic of your choice
  • Open the topic page, if there is not a relevant topic page you will be asked if you want to start a new page
  • Make changes and/or add content
  • Save

Suggested additions:

  • New and emerging concepts
  • Utilize your expertise to review, update, and enhance the quality of existing content
  • Adding links to good papers in OnePetro and elsewhere is a great way to enrich existing content pages.
  • Creation of pages about specific fields are welcome. Knowing the basics of the reservoir and how the field was developed over time can provide valuable information to others. (See Prudhoe_Bay_field and Kuparuk River field

Things to know:


Top Contributors to PetroWiki


All time (Top 10)