Is it necessary to install a downhole safety valve in a subsea ... - NTNU
Is it necessary to install a downhole safety valve in a subsea ... - NTNU
Is it necessary to install a downhole safety valve in a subsea ... - NTNU
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
<strong>Is</strong> <strong>it</strong> <strong>necessary</strong> <strong>to</strong> <strong><strong>in</strong>stall</strong> a <strong>downhole</strong> <strong>safety</strong> <strong>valve</strong> <strong>in</strong> a <strong>subsea</strong> oil/gas well?<br />
Wellhead<br />
seal leak<br />
Annulus<br />
master <strong>valve</strong><br />
EXL<br />
Annulus w<strong>in</strong>g<br />
<strong>valve</strong> ITL/EXL<br />
Tub<strong>in</strong>g hange tub<strong>in</strong>g<br />
hanger seal leak<br />
Tub<strong>in</strong>g hanger seal<br />
annulus bore leak<br />
Wellhead<br />
13 5/8" cas<strong>in</strong>g<br />
seal leak<br />
A-annulus area<br />
Through the DHSV<br />
Wellhead area<br />
Master production<br />
<strong>valve</strong> ITL<br />
Crossover l<strong>in</strong>e/<br />
annulus area<br />
Primary barrier<br />
Secodary barrier<br />
Third barrier<br />
Annulus swab<br />
<strong>valve</strong> ITL/EXL<br />
Crossover<br />
Annulus<br />
master <strong>valve</strong><br />
ITL<br />
Production<br />
packer leaks<br />
Surround<strong>in</strong>gs<br />
Crossover<br />
<strong>valve</strong>, ITL<br />
Tub<strong>in</strong>g hanger seal<br />
production bore leak<br />
A-<br />
Annulus<br />
Crossover l<strong>in</strong>e<br />
EXL<br />
ITL<br />
M. Valve<br />
Production tub<strong>in</strong>g<br />
above DHSV<br />
DHSV<br />
EXL<br />
Production tub<strong>in</strong>g<br />
below DHSV<br />
Reservoir<br />
Crossover<br />
<strong>valve</strong>, EXL<br />
Figure 5-3 Barrier diagram for an oil/gas produc<strong>in</strong>g well w<strong>it</strong>h a DHSV<br />
Diploma thesis, <strong>NTNU</strong> 2002<br />
Production<br />
swab <strong>valve</strong>,<br />
ITL/EXL<br />
Production<br />
master <strong>valve</strong>,<br />
ITL<br />
DHSV leak<br />
or FTC<br />
Production<br />
w<strong>in</strong>g <strong>valve</strong>,<br />
ITL/EXL<br />
Through<br />
DHSV<br />
Production<br />
master <strong>valve</strong>,<br />
EXL<br />
23