Introduction Of Drilling Fluid Invasion In Oil & Gas Indutry - Wikipedia
This document was uploaded by user and they confirmed that they have the permission to share it. If you are author or own the copyright of this book, please report to us by using this DMCA report form. Report DMCA
Overview
Download & View Introduction Of Drilling Fluid Invasion In Oil & Gas Indutry - Wikipedia as PDF for free.
More details
- Words: 304
- Pages: 1
Drilling fluid invasion - Wikipedia, the free encyclopedia
Page 1 of 1
Drilling fluid invasion From Wikipedia, the free encyclopedia
Drilling fluid invasion is a process that occurs in a well being drilled with higher wellbore pressure than formation pressure. The liquid component of the drilling fluid (known as the mud filtrate) continues to "invade" the porous and permeable formation until the solids present in the mud, commonly bentonite, clog enough pores to form a mud cake capable of preventing further invasion. If invasion is severe enough, and reservoir pressures are unable to force the fluid and associated particles out entirely when the well starts producing, the amount of oil and gas a well can produce can be permanently reduced. This is especially true when a process called phase trapping occurs. This is when a fluid enters a formation that is below its irreducible saturation of that fluid. Once the fluid is present, it is held in place by capillary forces and usually can not be removed. Invasion also has significant implications for well logging. In many cases the "depth of investigation" of a well logging tool is only a few inches (or even less for things like sonic logs), and it is quite possible that drilling fluid has invaded beyond this depth. Therefore the readings that are taken that are influenced by formation fluids are measuring mud filtrate properties rather than formation (in situ) fluid properties.
See also ■ Resistivity logging
Retrieved from "http://en.wikipedia.org/wiki/Drilling_fluid_invasion" Categories: Petroleum production | Drilling technology | Well logging | Petroleum stubs ■ This page was last modified on 14 November 2008 at 15:32. ■ Text is available under the Creative Commons Attribution/Share-Alike License; additional terms may apply. See Terms of Use for details. Wikipedia® is a registered trademark of the Wikimedia Foundation, Inc., a non-profit organization.
http://en.wikipedia.org/w/index.php?title=Drilling_fluid_invasion&printable=yes
8/3/2009
Page 1 of 1
Drilling fluid invasion From Wikipedia, the free encyclopedia
Drilling fluid invasion is a process that occurs in a well being drilled with higher wellbore pressure than formation pressure. The liquid component of the drilling fluid (known as the mud filtrate) continues to "invade" the porous and permeable formation until the solids present in the mud, commonly bentonite, clog enough pores to form a mud cake capable of preventing further invasion. If invasion is severe enough, and reservoir pressures are unable to force the fluid and associated particles out entirely when the well starts producing, the amount of oil and gas a well can produce can be permanently reduced. This is especially true when a process called phase trapping occurs. This is when a fluid enters a formation that is below its irreducible saturation of that fluid. Once the fluid is present, it is held in place by capillary forces and usually can not be removed. Invasion also has significant implications for well logging. In many cases the "depth of investigation" of a well logging tool is only a few inches (or even less for things like sonic logs), and it is quite possible that drilling fluid has invaded beyond this depth. Therefore the readings that are taken that are influenced by formation fluids are measuring mud filtrate properties rather than formation (in situ) fluid properties.
See also ■ Resistivity logging
Retrieved from "http://en.wikipedia.org/wiki/Drilling_fluid_invasion" Categories: Petroleum production | Drilling technology | Well logging | Petroleum stubs ■ This page was last modified on 14 November 2008 at 15:32. ■ Text is available under the Creative Commons Attribution/Share-Alike License; additional terms may apply. See Terms of Use for details. Wikipedia® is a registered trademark of the Wikimedia Foundation, Inc., a non-profit organization.
http://en.wikipedia.org/w/index.php?title=Drilling_fluid_invasion&printable=yes
8/3/2009
Related Documents
More Documents from "Faiz Ahmad"
Const. Mgmt. Chp. 05 - Cost Estimation
June 2020 10
Build Up Rate Format - Concretor
June 2020 9
Const. Mgmt. Chp. 09 - Construction Planning
June 2020 11
Build Up Rate - Guard Rail
June 2020 12
