USH1685HExpiredUtilityPatentIndex 69

Drilling fluid

Assignee: SHELL OIL COPriority: Jul 7, 1995Filed: Jul 7, 1995Granted: Oct 7, 1997

Est. expiryJul 7, 2015(expired)· nominal 20-yr term from priority

Inventors:LAU HON CHUNG HALE ARTHUR HERMAN BERNARDI JR LOUIS ANTHONY

C09K 8/32C09K 8/16

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Claims

Abstract

Zinc oxide and zirconium oxide are used as weighting materials for water and oil based drilling fluids for horizontal wells.

Claims

exact text as granted — not AI-modified

We claim: 
     
       1. A drilling fluid for use in geopressured horizontal wells comprising a liquid carrier medium and a weighting agent of zinc oxide or zirconium oxide having a particle size range of 4 to 200 microns. 
     
     
       2. The drilling fluid of claim 1 wherein the particle size range is 6 to 100 microns. 
     
     
       3. The drilling fluid of claim 1 wherein the particle size range is 8 to 50 microns. 
     
     
       4. The drilling fluid of claim 1 wherein the liquid carrier medium is water base. 
     
     
       5. The drilling fluid of claim 1 wherein the liquid carrier medium is oil base.

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