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US 10,472,552 B2Granted
Spacer fluids for cementing well bores
AssigneeBJ Services Company
InventorsRoderick B. Pernites, Angel Gonzalez, Felipe Padilla Florencia
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Abstract
Spacer fluids are provided for use in cementing liners in oil and gas wells. The fluids comprise pumice and a suspending agent. Pumice is the first-in weighting agent and is added in amounts sufficient to stabilize the rheology of the fluid over time and temperature.
Claims20
A non-settable weighted aqueous well fluid, said fluid comprising:
- (a) pumice;
- and
- (b) a suspending agent;
- (c) wherein said fluid has a time-temperature stability factor of about 10% or less;
- and
- (d) wherein said time-temperature stability factor is defined as the average deviation coefficient of the viscosity of said fluid over time and temperature expressed in percentage.
3 more elements
The fluid of 11, wherein pumice comprises at least about 60 wt % of said weighting agents.
A method of stabilizing a rheology of a non-settable weighted aqueous well treatment fluid over time and temperature, said method comprising:
- (a) weighting said fluid with pumice in an amount effective to provide said fluid with a time-temperature stability factor of less than about 10%;
- (b) wherein said time-temperature stability factor is defined as the average deviation coefficient of the viscosity of said fluid over time and temperature expressed in percentage.
Dependencies are inferred from the claim text.