Water based drilling fluid additive and methods of using fluids

Details Water based drilling fluid additive and methods of using fluids Water based drilling fluid additive and methods of using fluids

1995-08-24

1997-07-29

Tucker, Philip

Earth boring, well treating, and oil field chemistry

Earth boring

507135, 507906, 507940, C09K 702

Patent

active

056522002

ABSTRACT:
An additive for a water-based fluid which is to be used when the likelihood of differential sticking is high and which reduces the sticking tendency of the fluid and mud cake. An additive according to the invention comprises a well dispersed-particulate phase such as an emulsion, a fine emulsion, a microemulsion, a micellar phase or a polymeric phase having a particle size comparable with the pore throat size of a mud cake and comprising a material which forms easily deformable particles and which reduces the sticking propensity of the mud. One embodiment of the invention comprises a microemulsion of an oil which is well dispersed, substantially stable and has a substantial portion of the particle size distribution in the range 5-500 nm. An alternative embodiment comprises a micellar phase comprising one or more surfactants. The additive is typically used at a level of about 5% by volume in the drilling fluid.

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A. Hartmann, M. Ozerler, C. Marx, and H.-J. Neumann, "Analysis of Mudcake Structures Formed Under Simulated Borehole Conditions", SPE 15413, Society of Petroleum Engineers, 1986.

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