Patent Number: 6,169,134

Title: Viscosifying hydrocarbon liquids

Abstract: An oil based drilling mud is viscosified with a maleated ethylene-propylene elastomers. The elastomers are preferably EPM copolymers or EPDM terpolymers. The concentration of the maleic anhydride grafted to the copolymer or terpolymer backbone ranges from 0.01 to 5 wt %, preferably 0.1 to 2.0 wt %. The maleated elastomers are far more effective oil mud viscosifiers than the organophilic clays presently used.

Inventors: Jones; Cruise K. (Houston, TX), Acker; David B. (The Woodlands, TX)

Assignee: Nalco/Exxon Energy Chemicals, L.P.

International Classification: C09K 8/02 (20060101); C09K 8/32 (20060101); C09K 8/36 (20060101); C08L 005/01 ()

Expiration Date: 01/02/2018