Evaluation of cement integrity using distributed temperature sensing - - PowerPoint PPT Presentation

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Evaluation of cement integrity using distributed temperature sensing - - PowerPoint PPT Presentation

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Evaluation of cement integrity using distributed temperature sensing Jan Henninges and Wulf Brandt ENGINE Workshop 4, Drilling cost effectiveness and feasibility of high- temperature drilling, Reykjavik, Iceland, July 2-5, 2007 Dr. J.

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SLIDE 1
  • Dr. J. Henninges, ENGINE Workshop 4, Reykjavik, Iceland, July 2-5, 2007.

Evaluation of cement integrity using distributed temperature sensing

Jan Henninges and Wulf Brandt ENGINE Workshop 4, Drilling cost effectiveness and feasibility of high- temperature drilling, Reykjavik, Iceland, July 2-5, 2007

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SLIDE 2
  • Dr. J. Henninges, ENGINE Workshop 4, Reykjavik, Iceland, July 2-5, 2007.

Overview

Motivation:

  • Cementing: important operation, difficult to control
  • Primary objectives: support casing, seal annulus
  • Questions: how much cement in place? „Quality“?

Methods:

  • Temperature – heat of hydration during setting of cement
  • Acoustic – attenuation, mechanical coupling
  • Nuclear – admixture to cement slurry

Case study:

  • Permanent monitoring of CO2 injection and storage (CO2SINK)
  • Behind casing sensors: monitoring during operation
  • Fiber-optic distributed temperature sensing (DTS) during cementing
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SLIDE 3
  • Dr. J. Henninges, ENGINE Workshop 4, Reykjavik, Iceland, July 2-5, 2007.

Well design

  • 18-5/8“ surface casing (cemented)
  • 9-5/8“ intermediate casing (cemented)
  • 5-1/2“ casing:

– 8-1/2“ hole – two 9m filter screen sections – permanent sensor cables behind casing – DTS: fiber-optic distributed temperature sensing cable – VERA: vertical electrical resistivity array

  • stinger cementation

– below filter screens – 2,2 m³ of API Class G cement

18-5/8” 9-5/8” Filter #2 5-1/2” Filter #1 VERA DTS

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SLIDE 4
  • Dr. J. Henninges, ENGINE Workshop 4, Reykjavik, Iceland, July 2-5, 2007.

Installation of DTS and ERT cables in 1st well (May 5-6, 2007)

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SLIDE 5
  • Dr. J. Henninges, ENGINE Workshop 4, Reykjavik, Iceland, July 2-5, 2007.

DTS temperature profiles - pumping of cement

Quaternary Tertiary Cretaceous Weser fm Stuttgart fm Grabfeld fm Jurassic Upper Triassic

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SLIDE 6
  • Dr. J. Henninges, ENGINE Workshop 4, Reykjavik, Iceland, July 2-5, 2007.

DTS temperature profiles - setting of cement and circulation

Quaternary Tertiary Cretaceous Weser fm Stuttgart fm Grabfeld fm Jurassic Upper Triassic

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SLIDE 7
  • Dr. J. Henninges, ENGINE Workshop 4, Reykjavik, Iceland, July 2-5, 2007.

3D-view of DTS temperature data during cementing

pumping of cement fluid circulation

  • ver filter screens

setting of cement cement head 2nd filter 1st filter

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SLIDE 8
  • Dr. J. Henninges, ENGINE Workshop 4, Reykjavik, Iceland, July 2-5, 2007.

Change of temperature with time

20 25 30 35 40 45 50 55 60 07.05. 06:00 07.05. 12:00 07.05. 18:00 08.05. 00:00 08.05. 06:00 08.05. 12:00 08.05. 18:00 09.05. 00:00 09.05. 06:00 Date and Time Temperature (°C) Filter 1 top Filter 1 bottom Filter 2 top Filter 2 bottom Cement 744-754m Cement 754-776m Cement 776-792m

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SLIDE 9
  • Dr. J. Henninges, ENGINE Workshop 4, Reykjavik, Iceland, July 2-5, 2007.

Temperature profiles – initial condition

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SLIDE 10
  • Dr. J. Henninges, ENGINE Workshop 4, Reykjavik, Iceland, July 2-5, 2007.

Temperature profiles – pumping of cement

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SLIDE 11
  • Dr. J. Henninges, ENGINE Workshop 4, Reykjavik, Iceland, July 2-5, 2007.

Temperature profiles - pumping of cement

flow over lower filter

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SLIDE 12
  • Dr. J. Henninges, ENGINE Workshop 4, Reykjavik, Iceland, July 2-5, 2007.

Change of temperature with time and hydraulic data

20 25 30 35 40 45 07.05. 11:30 07.05. 11:45 07.05. 12:00 07.05. 12:15 07.05. 12:30 Date and Time Temperature (°C) 50 100 150 200 250 300 350 400 450 500 Pressure (bar) / Flowrate (l/min) Filter 1 top Filter 1 bottom Filter 2 top Filter 2 bottom Cement 744-754m Cement 754-776m Cement 776-792m Pressure (bar) Flowrate (l/min) P/Q data shifted -5 min.!

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SLIDE 13
  • Dr. J. Henninges, ENGINE Workshop 4, Reykjavik, Iceland, July 2-5, 2007.

Temperature profiles – circulation of KCl pill

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SLIDE 14
  • Dr. J. Henninges, ENGINE Workshop 4, Reykjavik, Iceland, July 2-5, 2007.

Temperature profiles – setting of cement

cement head cement inside casing?

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SLIDE 15
  • Dr. J. Henninges, ENGINE Workshop 4, Reykjavik, Iceland, July 2-5, 2007.

Temperature profiles and cement bond log

18-5/8” 9-5/8” Filter #2 5-1/2” Filter #1 VERA DTS

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SLIDE 16
  • Dr. J. Henninges, ENGINE Workshop 4, Reykjavik, Iceland, July 2-5, 2007.

Summary and Outlook

  • Successful installation of permanent sensor cables behind casing
  • Continuous temperature monitoring:

Location of cement head Amount of cement in place On-line information during operation

  • Evaluation of sealing, zonal isolation: other methods (CBL, etc.)
  • Advanced thermal modeling: thickness of cement sheath?