Methods for limiting the inflow of formation water and for stimulating subterranean formations
US5979557A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 29, 1997 |
| Grant date | Nov 9, 1999 |
| Priority date | — |
| Expiry date | May 29, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S507/923
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A method is provided for limiting the inflow of formation water during a well turn around to maximize polymer recovery after a hydraulic fracturing treatment of a formation. The method includes a step for selectively blocking the pore structure in a water-bearing zone and not blocking the pore structure of a hydrocarbon zone at the formation face; performing a hydraulic fracturing treatment using a fluid having a polymer; and turning the well around to recover the polymer. There is also provided a method of acidizing, preferably matrix acidizing, a formation having a hydrocarbon zone and a water-bearing zone. The method includes a step for selectively blocking the pore structure in the water-bearing zone at the formation face to selectively retard migration of acid into the water-bearing zone; and injecting acid into the formation, wherein the acid is diverted from the water-bearing zone to the hydrocarbon zone as a result of the selective blocking step. When the water-bearing zone contains a residual amount of hydrocarbon residues, the method further includes injecting a mutual solvent prior to the step for selectively blocking. In these methods, the step for selectively blocking …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.