Drilling well with drilling fluid of fluid phase and...

Details Drilling well with drilling fluid of fluid phase and... Drilling well with drilling fluid of fluid phase and...

2006-12-28

2008-08-12

Sellers, Robert (Department: 1796)

Wells

Processes

Placing fluid into the formation

C507S203000, C507S261000, C507S265000, C507S267000, C507S269000, C507S271000

Reexamination Certificate

active

07409994

ABSTRACT:
An additive that increases the density of fluids used in a wellbore during the construction or repair of oil, gas, injection, water, or geothermal wells comprises In one illustrative embodiment the additive comprises a weighting agent, and more preferably an ultra-fine weighting agent. Another embodiment includes a wellbore fluid containing an ultra-fine weighting agent that has an increased density with improved suspension stability without a significant viscosity increase. The wellbore fluid as described herein has rheological properties comparable to a conventional wellbore fluid. An illustrative embodiment of the claimed subject matter is further directed to a method for making the ultra-fine weighting agent and a method for using such ultra-fine weighting agent in a wellbore fluid. In one preferred embodiment the additive has a particle diameter between 4 μm to 15 μm. In another preferred embodiment, the additive has a D50of approximately 3 μm (1 μm to 6 μm). In another preferred embodiment the additive has a D90of approximately 6 μm (4 μm to 8 μm). The additive may be used in any wellbore fluid such as drilling, cementing, completion, packing, work-over (repairing), stimulation, well killing, and spacer fluid, as well as in a dense media separating fluid or in a ship's or other vehicle's ballast fluid.

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