TRACER LEAK OFF TESTS AS MEANS OF CHECKING WELL INTEGRITY. APPLICATION TO PARIS BASIN GEOTHERMAL PRODUCTION WELLS
- Key words
- tracers, Paris Basin, France
- Location
- Paris Basin, France
- Conference
- Stanford Geothermal Workshop
- Year
- 2002
- Session
- Direct Use
- Language
- English
Full text
1269KB, opens in a new tab
Abstract
Exploitation of geothermal district heating systems, located most often in sensitive, densely populated, urban environments require thorough monitoring of well integrity.
The latter is commonly controlled via casing caliper logs and packer leak off tests, provided production equipment, such as submersible pump sets and downhole chemical injection lines, have been previously removed.
Tracers, or fresh water, either injected downhole or squeezed from surface, production equipment in hole, may prove a feasible and cheaper alternative in assessing a reliable damage diagnosis.
The present paper reviews the figures of merit of candidate tracers, radioactive isotopes (131I, 82Br, 99mTc), chemical (NaI, Li2CO3), fluorescent (Rhodamine WT), fresh water, and field implementation protocols, based on selected Paris Basin case studies.
Field achievements led to the selection of combined, short duration, squeeze of Lithium carbonate/fresh water slugs regarded as the most rewarding, routine, and cots effective procedure.
Copyright 2002, Stanford Geothermal Program. Readers who download papers from this site should honour the copyright of the original authors, and may not copy or distribute the work further without the permission of the original publisher.