Natural fracture injection test
US9366122B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 22, 2012 |
| Grant date | Jun 14, 2016 |
| Priority date | — |
| Expiry date | Feb 15, 2035 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B49/08
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A method for estimating a property of an earth formation penetrated by a borehole includes: performing a borehole integrity test at a pressure less than a fracture gradient pressure of the formation to provide leakage data; injecting a fluid into the formation at a first pressure greater than the fracture gradient pressure during a first injection time interval using a fluid injector; measuring pressure versus time using a pressure sensor and a timer during a first test time interval to provide first pressure data; injecting a fluid into the formation at a second flow rate greater than the first flow rate during a second injection time interval using the fluid injector; measuring pressure versus time using the pressure sensor and the timer during a second test time interval to provide second pressure data; and estimating the property using the first pressure data, the second pressure data, and the leakage data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.