Method for determining the rheology of a gelled fluid
AssigneeHalliburton Energy Services, Inc.
InventorRobert S. Taylor
Life of this patent
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Abstract
The current invention provides a method for determining the rheology of a mixture of gelled hydrocarbon and liquid carbon dioxide. The method of the current invention precludes the negative impact of the Weissenberg effect when determining the rheology of a non-Newtonian fluid. Additionally, the method of the current invention produces a homogenous mixture without generating the Weissenberg effect.
Claims31
A method for determining the rheology of a mixture of gelled hydrocarbon and liquid carbon dioxide comprising the steps of:
- a) filling a sample chamber located in a rotary viscometer with a gelled hydrocarbon and liquid carbon dioxide thereby substantially eliminating all undissolved gas from said sample chamber;
- b) mixing said liquid carbon dioxide and said gelled hydrocarbon to form a homogenous mixture;
- c) rotating a sleeve positioned within said sample chamber thereby shearing said mixture;
- d) determining the shear rate experienced by said mixture;
- e) increasing the pressure within said sample chamber by adding additional ungelled hydrocarbon prior to determining the rheology of said mixture;
- and
- g) determining the rheology of said mixture.
The method of claim 3, wherein said mixture is heated to a temperature between about 20° C. to about 205° C.
A method for determining the rheology of a gelled hydrocarbon fluid comprising the steps of:
- a) filling a sample chamber located in a rotary viscometer by filling said sample chamber with a gelled hydrocarbon and liquid carbon dioxide thereby substantially eliminating all undissolved gas from said sample chamber;
- b) mixing said liquid carbon dioxide and said gelled hydrocarbon to form a mixture;
- c) cooling said mixture;
- d) rotating a sleeve positioned within said sample chamber thereby shearing said mixture;
- and,
- e) determining the rheology of said mixture.
A method for precluding the Weissenberg effect when determining the rheology of non-Newtonian fluids using a rotary viscometer comprising the steps of:
- a) filling a sample chamber with a non-Newtonian gelled fluid thereby eliminating substantially all undissolved gases from said sample chamber;
- b) pressurizing the sample chamber by adding additional ungelled fluid to the non-Newtonian gelled fluid, said fluid being the same as used in preparing the gelled fluid:
- c) rotating a sleeve positioned within said sample chamber by means of a drive shaft connect to the lower portion of said sleeve thereby shearing said non-Newtonian fluid and thereby eliminating the Weissenberg effect;
- and,
- d) determining the rheology of said non-Newtonian fluid.
Dependencies are inferred from the claim text.