Well preflush fluid

Details Well preflush fluid Well preflush fluid

1989-12-28

1992-01-21

Dixon, Jr., William R.

Compositions: coating or plastic

Coating or plastic compositions

Inorganic settable ingredient containing

106736, 166293, 166283, C04B 721

Patent

active

050824996

ABSTRACT:
A thixotropic preflush fluid is employed in a well drilling operation to prevent loss of cement slurry to an air zone penetrated during the drilling operation. The preflush fluid comprises water, a cement, calcium sulfate, and a quick-hardening accelerator. Optionally, the preflush fluid also comprises a thickening agent.

REFERENCES:
patent: 2292616 (1942-08-01), Dailey
patent: 2846327 (1958-08-01), Wood et al.
patent: 3340929 (1967-09-01), Slagle
patent: 3563313 (1971-02-01), Spangle
patent: 4082561 (1978-04-01), Nakagawa et al.
patent: 4102400 (1978-07-01), Crinkelmeyer et al.
patent: 4415367 (1983-11-01), Nelson

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