Reservoir Flow Allocation and Quantification Using Spectral Acoustic Data and Temperature Logs: Case Studies in Highly Deviated and Horizontal Wells Equipped with Slotted Liners and Sandscreens
Notice bibliographique
Résumé
Abstract In highly deviated and horizontal wells, focusing on inside wellbore data (flowmeter, hold-up, density, etc.) may not be enough to understand in full the well and particulary reservoir behavior, as most of the time downhole logging tools lack the capacity to reveal reservoir/well interaction, mainly in those cases where flows could occur outside the wellbore (e.g. slotted liner or sandscreen). The objective of this paper is to provide a unique solution following which a thorough understanding of flow inside the wellbore and up to five meters into the reservoir can be obtained by temperature and spectral acoustic logs. Fluid flows in wells completed with slotted liners or sandscreens, especially those in deviated and horizontal wells, can occur either inside or outside the liner and/or casing. The conventional production logging technique in this type of completion is usually based on results generated by a mechanical flowmeter which measures flow only inside the wellbore but fails to depict flows and entry points behind tubing/casing; for example, when there is flow through cement channels or flow inside the annular section of the wells completed with a slotted liner. Mechanical spinners have other limitations; 1) they cannot pick up small rates in low potential wells, 2) they can give false response of apparent down flow (heavy-phase recirculation) in deviated wells with 2- and 3-phase flow, 3) they are prone to harsh wellbore conditions, particulary in open-hole completions. The Total Flow analisys (borehole and reservoir flow) uses Chorus spectral acoustic and Cascade temperature logging suite is an innovative addition to conventional single and multi-array PLT tools which are designed to address the above issues. This is done by a combination of hardware and modelling solutions which can be run in highly deviated and horizontal wells with a multi-phase flow and is able to pick up small flows behind multiple barriers. This paper presents the Total Flow results of spectral acoustics and temperature logging suite run in two horizontal wells equipped with sandscreens, and two highly deviated wells, all completed with slotted liners. These are the most difficult cases where conventional production logging tools usually fail to give vigorous results on fluid entry points as wells as the flow rate at each entry point, whereas spectral acoustic and temperature logs combination can provide detailed results on both entry points and quantity of each phase. The paper also compares the results of production logging and spectral acoustics/temperature logs in three wells to emphasize how using an inappropriate tool for a certain condition could give a wrong result which is far from the actual downhole situation.
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| Catégorie | Codex | Gemma |
|---|---|---|
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| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,001 | 0,001 |
| Études des sciences et des technologies | 0,001 | 0,001 |
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| Science ouverte | 0,001 | 0,001 |
| Intégrité de la recherche | 0,001 | 0,000 |
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Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
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score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
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