Method of determination of weighting materials and low...

Details Method of determination of weighting materials and low... Method of determination of weighting materials and low...

G - Physics

01

N

150/17, 73/40

G01N 33/26 (2006.01) E21B 21/06 (2006.01) E21B 21/08 (2006.01) G01N 9/36 (2006.01) G01N 25/14 (2006.01)

Patent

CA 1222933

- 17 - METHOD OF DETERMINATION OF WEIGHTING MATERIALS AND LOW GRAVITY SOLIDS IN DRILLING FLUIDS ABSTRACT OF THE DISCLOSURE Normally, concentration of weighting agents such as barium sulphate is calculated by retort distillation to dryness and by means of a relatively inaccurate mate- rial-balance equation. The present process utilizes the fact that weighting agents have a specific gravity higher than the specific gravity of the low gravity solids such as bentonite, etc. present in the drilling fluids. A sam- ple is mixed with a liquid known as a developer liquid which has a specific gravity higher than the low gravity solids which therefore float on the developer, but lower than the weighting agent which sinks in the developer. The mixture is preferably centrifuged to force the weight- ing agent out of the drilling fluid and into the developer liquid after preferably lowering the viscosity of the dril- ling fluid. The settled heavy gravity solids (weighting agent) may then be removed, dried and weighed or prefer- ably the volume is read directly on a suitably graduated centrifuge tube in which the settling process has taken place. By calibration with fluids containing known con- centrations of the weighting agent, the volume readings can readily be converted into concentration units.

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