Functional fluids and liquid cleaning compositions and suspending media

  • US 5,807,810 A
  • Filed: 06/01/1995
  • Issued: 09/15/1998
  • Est. Priority Date: 08/24/1989
  • Status: Expired due to Fees
First Claim
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1. A method of drilling bore holes by means of a drill bit wherein a drilling fluid is applied to said drill bit, wherein said drilling fluid comprises an aqueous structured surfactant system and wherein said structured surfactant system is a fluid composition which has shear dependent viscosity and solid suspending properties and which comprises a surfactant mesophase dispersed in or interspersed with an aqueous phase, said mesophase comprising a G-phase, spherical or spheroidal bodies having dimensions of from 0.1 to 50 microns formed from substantially concentric shells of surfactant bilayer or lamellar hydrated solid, and said structured surfactant system contains a total of less than 10% by weight of oils, organic solvents and hydrotropes.

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