Low shear polymer injection method with ratio control between wells
US4204574A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 21, 1978 |
| Grant date | May 27, 1980 |
| Priority date | — |
| Expiry date | Mar 21, 1998 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K8/588
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A method for the insertion of shear degradable aqueous polymer solutions in a polymer thickened flood wherein a series of pumps are used in a multi-branch system, while reducing shear degradation while maintaining pressure and rate control within any branch of said multibranch system comprising utilizing hydraulic drivers for the pumps wherein the hydraulic power source for the drivers is controlled (a) by a pressure sensing loop such that a selected preset pressure will not be exceeded by any branch of the injection system, and (b) by a rate proportioning control loop whereby the injection rate in the various branches of the multi-branch system will be maintained in a given proportion to one another regardless of rate changes in a designated master branch or in the total injection stream. Polymer shear rates are reduced by using plunger pumps, progressive cavity pumps, diaphram pumps or other low shear pumps for the polymer injection while utilizing throttle valves and hydraulic pumps for the hydraulic oil power system. An optional manually controlled variable speed drive can minimize the amount of bypassed hydraulic power oil.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.