Abrégé

A system for testing of leaking past a well barrier. The system includes a well including a wellbore and a upper wellbore termination means. A barrier is provided in the wellbore, the barrier having an upstream side below the barrier and a downstream side above the barrier. The system further includes a tracer and a storage means for storing said tracer, the storage means being provided below the barrier in the well. A release mechanism is configured for releasing the tracer from the storage means, wherein a pressure differential is established across the barrier for driving tracer from the upstream side to the downstream side of the barrier. A detector is configured for detecting the tracer that has leaked through the barrier, the detector being provided in the wellbore between said barrier and said upper wellbore termination means.

Classes IPC  ?

• E21B 47/11 - Localisation des fuites, intrusions ou mouvements du fluide utilisant la radioactivité
• E21B 21/01 - Dispositions pour manipuler les fluides de forage ou les déblais à l'extérieur du trou de forage, p.ex. réservoirs à boue
• E21B 21/06 - Dispositions pour traiter les fluides de forage à l'extérieur du trou de forage
• E21B 33/12 - Packers; Bouchons
• G01M 3/02 - Examen de l'étanchéité des structures ou ouvrages vis-à-vis d'un fluide par utilisation d'un fluide ou en faisant le vide

Abrégé

A method is for testing the pressure integrity of a barrier in an annulus outside a pipe string in a wellbore, the method including the steps of: establishing a fluid connection between an inside of the pipe string and an annulus out-side the pipe string at a first position and second positions in the wellbore, the second position being offset from the first position along the axial direction of the wellbore; establishing a temporary barrier between the fluid connections at the first and second positions in the wellbore; establishing a pressure differential across the temporary barrier; releasing a tracer from below the temporary barrier; and sniffing for tracer above the temporary barrier to verify a leakage through the temporary barrier and/or the barrier in the annulus. There is also disclosed a tool for executing such a method.

Classes IPC  ?

• E21B 47/11 - Localisation des fuites, intrusions ou mouvements du fluide utilisant la radioactivité
• E21B 47/117 - Détection de fuites, p.ex. du tubage, par test de pression
• E21B 47/005 - Surveillance ou contrôle de la qualité ou du niveau de cimentation
• E21B 47/098 - Localisation ou détermination de la position d'objets dans les trous de forage ou dans les puits; Identification des parties libres ou bloquées des tubes utilisant des garnitures d'empreinte, p.ex. pour détecter des enfoncements ou des perforations

Abrégé

A system is for testing the integrity of a well barrier. The system has a well including a wellbore and a upper wellbore termination means, such as a wellhead and a mud circulation system and/or a mud conditioning system comprising means for transporting, cleaning or storing mud outside said wellbore; a barrier provided in the wellbore, the barrier having an upstream side below the barrier and a downstream side above the barrier; a tracer; a storage means for storing said tracer, the storage means being provided in a lower part of the barrier and/or below the barrier in the well; and a release mechanism for releasing the tracer from the storage means, wherein the system further comprises a detector for detecting tracer that has leaked through the barrier and into said mud, the detector being arranged above the wellbore.

Classes IPC  ?

• E21B 47/11 - Localisation des fuites, intrusions ou mouvements du fluide utilisant la radioactivité
• E21B 21/01 - Dispositions pour manipuler les fluides de forage ou les déblais à l'extérieur du trou de forage, p.ex. réservoirs à boue
• E21B 21/06 - Dispositions pour traiter les fluides de forage à l'extérieur du trou de forage
• E21B 33/12 - Packers; Bouchons
• G01M 3/02 - Examen de l'étanchéité des structures ou ouvrages vis-à-vis d'un fluide par utilisation d'un fluide ou en faisant le vide