Method for detecting and locating sand producing zones in friable, unconsolidated sandstone formations of subterranean formations
US3949220A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 4, 1974 |
| Grant date | Apr 6, 1976 |
| Priority date | — |
| Expiry date | Oct 4, 1994 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V5/08
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for locating and identifying sand producing zones in friable, unconsolidated sandstone formations of a subterranean reservoir traversed by a well bore. The method comprises the following steps: A. introducing into said reservoir through said well bore, a radioactive material which is preferentially retained in the porous portions of the formation surrounding said well bore; B. passing a radioactivity detection means through the well bore and recording the measurement of radioactivity of said reservoir; C. returning the reservoir to production; and, D. passing a radioactivity detection means through said well bore and recording the measurement of radioactivity of said formation for a second time and correlating the measurements of radio activity of each measurement with measurement of depth to thus locate sand producing zones in said reservoir.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.