Combined rheometer/mixer having helical blades and methods of determining rheological properties of fluids

Patent metadata

Field	Value
Publication number	US-9702800-B2
Application number	US-201414322823-A
Country	US
Kind code	B2
Filing date	Jul 2, 2014
Priority date	Nov 10, 2011
Publication date	Jul 11, 2017
Grant date	Jul 11, 2017

Abstract

A method of determining rheological properties can include dispensing a fluid into a rheometer including a stator having at least one helical blade, measuring torque (T) due to relative rotation between the stator and a rotor of the rheometer at different rotational speeds (RPM's), calculating shear stress (SS) as follows: SS=T β /K, and calculating volume averaged shear rate (VASR) as follows: VASR=k1*RPM α , where K, k1, α and β are experimentally-derived coefficients. A method of mixing fluids and performing a rheological test on the admixed fluids can include dispensing a fluid into a rheometer, then dispensing another fluid into the rheometer, then mixing the fluids with at least one helical blade of the rheometer, and then measuring torque due to relative rotation between a stator and a rotor of the rheometer. A rotary rheometer can include a rotor, and a stator having at least one helical blade.

First claim

What is claimed is:

1. A rheometer, comprising:
a stator comprising first helical blades;
a rotor comprising second helical blades, and
wherein the first helical blades are intermeshed with the second helical blades.

2. The rheometer of claim 1 , wherein the first and second helical blades have a substantially same pitch.

3. The rheometer of claim 1 , wherein the first and second helical blades have a substantially same curvature.

4. The rheometer of claim 1 , wherein the first helical blade comprises a portion of a helix.

5. The rheometer of claim 1 , wherein the first helical blade is spaced apart from the second helical blade by a substantially constant gap.

6. The rheometer of claim 1 , wherein the first helical blades are helically spaced apart on a cylindrical surface of the stator.

7. The rheometer of claim 1 , wherein the second helical blades are axially spaced apart on the rotor.

8. A rotary rheometer, comprising:
a stator comprising first helical blades;
a rotor comprising second helical blades, and
wherein the second helical blades are axially spaced apart into flights separated by the first helical blades.

9. The rotary rheometer of claim 8 , wherein the first helical blades are helically spaced apart on the stator.

10. The rotary rheometer of claim 8 , wherein the first and second helical blades are spaced apart from each other by a substantially constant gap.

11. The rotary rheometer of claim 8 , wherein the first and second helical blades have a substantially same pitch.

12. The rotary rheometer of claim 8 , wherein the first and second helical blades have a substantially same curvature.

13. The rotary rheometer of claim 8 , wherein the second helical blades are axially spaced apart on the rotor.

Assignees

• Halliburton Energy Services Inc

Inventors

• Morgan Ronnie G
• Pindiprolu Sairam K S
• Balaraman Balasundaram
• Pangu Ganesh S

Classifications

• G01N11/14 Primary

  by using rotary bodies, e.g. vane (G01N11/16 takes precedence) · CPC title