Apparatus and method for analyzing well fluid sag

Details Apparatus and method for analyzing well fluid sag Apparatus and method for analyzing well fluid sag

G - Physics

01

N

G01N 15/04 (2006.01) E21B 49/00 (2006.01) G01N 3/00 (2006.01) G01N 11/00 (2006.01)

Patent

CA 2485492

An apparatus and method are disclosed for measuring or analyzing dynamic and static sag caused by settling of weighting materials in drilling fluids or other solids bearing fluid. The apparatus comprises a tube and shear shaft assembly (30) that allows for a controlled rate of shear to be applied to a sample of the fluid for testing. During a test, the assembly is placed on a pivotal holder (1) at an angle. The assembly has pistons (9) at the pivot center of the assembly which accommodate expansion and contraction of the test fluid due to changes in temperature and pressure, thereby allowing the test fluid to be heated, cooled and pressurized to simulate subterranean wellbore conditions without changing the center of mass of the test fluid. When weight material settles down the inclined assembly, the center of mass of the assembly changes resulting in changing torque or moment about the pivotal holder. The resultant moment is measured by energizing external coils (42) arranged to provide a uniform magnetic field. The bulk average settling rate is determined using the measured coil current rate of change.

L'invention concerne un appareil et un procédé permettant de mesurer ou d'analyser l'affaissement dynamique ou statique provoqué par le dépôt de matériaux de charge dans des fluides de forage ou d'autres fluides de palier à lubrifiants solides. L'appareil comporte un tube et un ensemble tige de cisaillement (30) permettant d'appliquer un taux régulé de cisaillement à l'échantillon de fluide à tester. Pendant l'essai, l'ensemble est placé sur un support pivotant (1) au niveau d'un angle. L'ensemble présente des pistons (9) au niveau du centre du pivot de l'ensemble qui adapte l'extension et la contraction du fluide d'essai dû aux changements de température et de pression de façon à chauffer, à refroidir et à pressuriser le fluide d'essai afin de stimuler l'état du puits de forage souterrain sans pour autant changer le centre de masse du fluide d'essai. Lorsque la matière de charge se fixe sur l'ensemble incliné, le centre de masse de l'ensemble change de sorte que le couple ou le moment changent autour du support pivotant. Le moment obtenu est mesuré par excitation des bobines externes (42) agencées de façon à obtenir un champ magnétique uniforme. Le taux de sédimentation moyen est déterminé au moyen du taux de changement de courant de bobine mesuré.

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