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CO2 Corrotion

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					CO2 Corrosion at Seguni A
   and Mitigation Program
Replacement of Test Header
April 15, 2003
                                                                                                   well 2                IP.
                                                                                                   Si                    49
                                                                          W                                                                    IP.2            IP.4
                                                                                                  well 1
                                                            IP.3          .2                                                                   0               7
                                                                                                  Si
                                                            5                                                                                                IP.2

Inspection Result                                                                                                     IP.4
                                                                                                                      8
                                                                                                                                           IP.4
                                                                                                                                           6
                                                                                                                                                             1
                                                                                                                                                                             IP.
                                                                                                                                                                             22
                                                                                    IP.                                                     well 3
                                                                                    34                                IP.5                                                             IP.
                                                                                      IP.                                                   Si                                         23
                                                               IP.                                                    3
                                                                                      33                                                                well 4
                                                               36                                IP.5          IP.3
                                                                                                                                           8            Si
                                                                                                 2             2                                                    well 4                           IP.
                                                                                                                 IP.3                      "                                                         24
                                                                                                                                                                    Si
                                                                                                                 1                                                           W
                                                                       IP.3                                    IP.1                 IP.3                                     .1
                                                                       7                                       4                    0                                                              IP.
                                                                                                                                                IP.2
                                                                                                                IP.                                                                                25
                                                                                                                                                9                                  4
                                                                                                                38                                           IP.2
                                                                                                                                   IP.3           IP.                              "
                                                                                                                                                             8                                 IP.
                                                                                                                                   9              42                   IP.2
                                                                                                                                                                       7 E                     26
                                                                             IP.                                                    IP.           A      B            C     oil pig
                                                                             13                                                     40           IP.4                       launcher
                                                                                                       IP.                                       1                           D
                                                                                                                                                         A
                                                                                                       12                                                             IP.4
                                                                                           IP.                                                                        2                      IP.
                                                                                           8                                                                                                 45


IP           ISO                DIA     NOM. THK.                                                             MIN. THK                AC T. MAWP
                                                    TML       12      3             6             9                                                                           NOTE
NO           NO.               ( OD )   SC HEDULE                                                            mm              in.          ( PSIG )

25   IS O- 0 1 - P P - S G A   3.500    11.1/160    pipe    10.54    10.54         10.23         10.22       10.22      0.402              4330

26   IS O- 0 1 - P P - S G A   3.500    11.1/160    elbow   10.64    9.87          11.16           -         9.87       0.389              4167              UT SCANNING BY UT USK 6

27   IS O- 0 1 - P P - S G A   3.500    11.1/160    pipe    10.87    11.21         10.56         11.54       10.56      0.416              4489

28   IS O- 0 1 - P P - S G A   8.625     12.7/80    pipe    12.34    11.98         11.56         11.36       11.36      0.447              1850              UT SCANNING BY UT USK 6

29   IS O- 0 1 - P P - S G A   8.625     12.7/80    pipe    11.25    11.32         11.45           -         11.25      0.443              1831              UT SCANNING BY UT USK 6

30   IS O- 0 1 - P P - S G A   8.625     12.7/80    pipe    11.01    10.07         6.12          10.65       6.12       0.241                  977                  internal corrosion

31   IS O- 0 1 - P P - S G A   8.625     12.7/80    pipe    12.25    10.55         10.72         11.56       10.55      0.415              1713              UT SCANNING BY UT USK 6

32   IS O- 0 1 - P P - S G A   8.625     12.7/80    pipe    12.45    11.02         11.12         12.24       11.02      0.434              1792              UT SCANNING BY UT USK 6

33   IS O- 0 1 - P P - S G A   8.625     12.7/80    pipe    11.87    10.17         8.01          12.25       8.01       0.315              1288                     internal corrosion
The Presence of CO2 Corrosion


                           aa
Sweet Corrosion…
 Chemical Reaction:
  CO2 + H2O      H2CO3 (Carbonic Acid)
  Fe + H2CO3      FeCO3 + H2
 Determination of Corrosivity Due to CO2:
  (NACE) > 30 Psig
What have found on
Test Header Replacement…

              Hole (look like a termite house)

                     Mud on test header spool
                       contained of H2O and
                     H2CO3 (Carbonic Acid) with
                             pH 4.2

                             Welding join were
                              damage
Damage Internal Elbow Surface and
Not Detected…


                 Found Internal Surface look
                        like very thin




                          High flow rate pattern
The History of Test Header
Replacement….


                      • 2 Days of work with 20
                      people on site….
                      •Use David Crane and
                      Electrical Hoist
                      •Space for dismantled
                      and installation is limited
Corrosion Mitigation Program

  Continue to inject Gas Chemical Inhibitor on the
  downstream of Choke Valve (Have start on October
  2002) and Check the availability of the chemical stock
  and pump.
  Continue to perform a regular corrosion rate monitoring
  and inspect wall thickness (Corrosion Probe and
  Coupon available since October 22).
  Since the material change (pipe and spool) very often in
  Seguni A because of the presence of CO2, the
  possibility of chemical inhibitor injection inside the well
  tubing is considered. Any injection point will be studied.

				
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posted:8/26/2012
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Description: about CO2 Corrotions