Hydraulic delay toe valve system and method
US10138709B2 · kind B2 · utility
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21References
22Claims
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Key dates
| Filing date | Aug 31, 2015 |
| Grant date | Nov 27, 2018 |
| Priority date | — |
| Expiry date | Jan 14, 2037 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B2200/06
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An apparatus and method for providing a time delay in injection of pressured fluid into a geologic formation. In one aspect the invention is a toe valve activated by fluid pressure that opens ports after a predetermined time interval to allow fluid to pass from a well casing to a formation. The controlled time delay enables casing integrity testing before fluid is passed through the ports. This time delay also allows multiple valves to be used in the same well casing and provide a focused jetting action to better penetrate a concrete casing lining.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.