Low solids, high density fluids for well drilling

Details Low solids, high density fluids for well drilling Low solids, high density fluids for well drilling

1995-02-10

1997-04-01

Springer, David B.

Earth boring, well treating, and oil field chemistry

Earth boring

Contains inorganic component other than water or clay

507271, 507111, C08B 1120, C09K 300, C09K 702, E21B 4300

Patent

active

056165412

ABSTRACT:
Disclosed are low solids, high density fluids useful as drilling, workover, and completion fluids and the like in oil and gas well operations. The fluids comprise one or more brines having a density greater than about 1500 kg/m.sup.3, a viscosifier which is a high surface area silica, a fluid loss control additive which is preferably a starch derivative, one or more water soluble or acid soluble bridging agents, and, optionally, an alkaline buffer and a polar additive.
Also disclosed is an additive for the preparation of low solids, high density fluids which comprises a fumed silica and a bridging agent in a weight ratio of bridging agent to fumed silica from about 2 to about 20, and optionally, an alkaline buffer in a weight ratio of alkaline buffer to fumed silica from about 0.03 to about 2.5.

REFERENCES:
patent: 3762485 (1973-10-01), Chesser et al.
patent: 4175042 (1979-11-01), Mondshine
patent: 4427556 (1984-01-01), House et al.
patent: 4435564 (1984-06-01), House
patent: 4822500 (1989-04-01), Dobson et al.
patent: 5283235 (1994-02-01), Bush et al.

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