Water based wellbore fluids

Details Water based wellbore fluids Water based wellbore fluids

2005-04-26

2005-04-26

Tucker, Philip C. (Department: 1712)

Earth boring, well treating, and oil field chemistry

Earth boring

Contains inorganic component other than water or clay

C507S111000, C507S112000, C507S114000, C507S115000, C507S137000, C507S212000, C507S214000, C507S216000, C507S263000, C507S269000, C507S901000

Reexamination Certificate

active

06884760

ABSTRACT:
The invention relates to water based wellbore fluids used during a hydrocarbon recovery process, such as drilling, fracturing, gravel packing and wellbore workover. According to the present invention, said wellbore fluid comprises a fluid loss additive and a bridging material that are hydrophobic in nature, hydrophobically modified or oil wettable. The wellbore fluid generates an active filter cake that once formed, is impermeable to an aqueous phase, thus reducing fluid loss and ensuring reduced damage to the formation, yet simultaneously is permeable to the back flow of hydrocarbons during a hydrocarbon recovery process.

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