CO2 SINK
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  TECHNICAL INFORMATION  *


Drilling, Coring & Logging

General drilling programme

  • 3 vertical wells, each about 800 m TVD, 5 ˝" OD production casing
  • 2 observation (OW1, OW2), 1 injection well (IW)
  • target: Stuttgart-Formation, saline sandstone aquifer
  • oriented perforation in reservoir
  • 3 1/2" injection string incl. packer in IW

 

Fig. 1: CO2SINK reservoir development scheme

 

Well profile

 

Depth up to ...

Diameter

 

Quality

Connection

[m]

[inch]

[mm]

[lb/ft]

   

Standpipe

30

24

610

125.50

min. X-52

according to API

Anchor string

150

18 5/8

473

87.50

min. H-40

BTC

Reserve string

ca. 340

13 3/8

340

54.50

min. K-55

BTC

Technical string

590

9 5/8

244

36.00

min. K-55

BTC

Production string

800

5 1/2

140

20.00

stainless steel 13Cr80

(outer coating)

Premium

(gastight)

Injection string

680

3 1/2

89

9.30

min. C-95

Premium

(gastight)

Casing programme; the lower part of the production casing (from ~469 to 802m - 333m) will be made up of 13Cr80 for improved corrosion resistance (see material selection), for the top hole section above the cap rock L-80 carbon stell will be used

 

 

 

 

Downhole pressure gauge above permanent production packer in ~700 m depth; optical fibre service line fed back to surface on injection string (attached via metal cable); the cable specifications are:

  • Optical cable encased in 1/4" OD x 0.028" wall Incoloy 825 tube
  • Encapsulated to 11mm x 11 mm square in polypropylene for full 150 Deg C compatibility

 

Source: Weatherford

 

Behind casing sensor (BCS) programme

IW, OW1 & OW2:

  • 2x 5.5 mm OD optical fibre cable strings (HDPE coating)
  • 1x 0.56 in. (14.22 mm) OD electric cable (PU coating)
  • cable protectors with one cable feed-through of 1"

Attachment of BCS on casing strings with metal control line protectors (e.g. MCLP by Weatherford, design to be specified). The protectors simultaneously act as casing centralizers and are mounted on the pipe body. Thus there design only depends on the OD of the casing and the borehole size.

The well head equipment has to be customized for the BCS programm. A technical concept is currently being established. In case of a conventional well head system a casing spool with a 45° outlet below the slips section is required.

 

Fig. 2: Casing Scheme Injection Well IW

 

Fig. 3: Casing Scheme Observation Wells OW1 and OW2

 


 

Coring Programme

Formation

OW1

IW

OW2

Weser-Formation

x

x

-

Stuttgart-Formation

x

x

- (optional)

Grabfeld-Formation

x

(x)

-

 

 

 

Coring Program Observation Well OW1:

Formation

Coring Section

Run Length

Coring Runs

Weser Fm.

563 - 590 m

9

3

Weser Fm.

626 - 635 m

9

1

Stuttgart Fm.

635 - 725 m

9

10

Grabfeld Fm.

725 - 734 m

9

1

 

 

 

 

 

Total core section: 135 m

 

 

Coring Program Injection Well IW:

Formation

Coring Section

Run Length

Coring Runs

Weser Fm.

626 - 635 m

9

1

Stuttgart Fm.

635 - 725 m

9

10

Grabfeld Fm.

-

-

-

 

 

 

 

Total core section: 99 m

 

 

Coring Program Observation Well OW2:

Formation

Coring Section

Run Length

Coring Runs

Weser Fm.

-

-

-

Stuttgart Fm.

635 - 725 m

9

optional

Grabfeld Fm.

-

-

-

 

 

 

 

Total core section: optional

 


 

Logging Programme

 

Logging Section

Bit Size

Casing

Lithology

Log Type

Estimated Log Time

0-150 m (open hole)

20"

18 5/8"

Basis Rupelfolge

Caliper, Borehole Orientation, Spectrum GR, Density, Sonic

5 hr

0-150 m (cased hole)

20"

18 5/8"

Basis Rupelfolge

Cement Bond Log, Variable Density Log

5 hr

OPTIONAL:

150-360 m (open hole)

17 1/2"

13 3/8"

Weser Formation

Caliper, Spectral GR, Mud Parameter, Borehole Orientation, SP, Sonic Velocity, Resistivity, Bulk density

12 hr

OPTIONAL:

150-590 m (cased hole)

17 1/2"

13 3/8"

Weser Formation

Cement Bond Log, Variable Density Log

5 hr

150-590 m (open hole)

12 1/4"

9 5/8"

Weser Formation

Caliper, Spectrum GR, Mud Parameter, Borehole Orientation, SP Sonic Velocity, Resistivity, Bulk Density, Neutron Porosity

12 hr

150-590 m (cased hole)

12 1/4"

9 5/8"

Weser Formation

Cement Bond Log, Variable Density Log

5 hr

590-802 m (open hole)

8 1/2"

5 1/2"

Grabfeld Formation

Caliper, Spectral GR, Mud Parameter, Borehole Orientation, SP Sonic Velocity, Resistivity, Bulk Density, Neutron Porosity

24 hr

590-802 m (cased hole)

8 1/2"

5 1/2"

Grabfeld Formation

Cement Bond Log, Variable Density Log, Ultrasonic Imager Tool

12 hr

590-802 m

8 1/2"

5 1/2"

Grabfeld Formation

Optional: Pulsed Neutron, RST, NMR, FMI, DSI, USIT

36 hr

(700 m)

     

Downhole Fluid Sampler

5 hr

Preliminary downhole logging programme for all three wells IW and OW1+2

 

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