How HTHP completions differ from the "norm"

World Oil, Jan, 2001 by Bob Moe, Carl Johnson

LITERATURE CITED

(1.) NKK Products Bulletin.

(2.) Murali, J., G. L. Boswell and R. R. Shulz, "Selection and application of stainless stool tubulars for a deep hot gas well," Oil and Gas Journal, Aug. I, 1983. PP. 94-99.

(3.) Cab Val Products Bulletin.

(4.) Ikeda, A. et al., "Introduction of a new dynamic field tester and preliminary results on flow effects on [CO.sub.2] corrosion," paper No. 48, NACE Corrosion 92.

                      General application limits for
                 corrosion-resistant alloy (CRA) tubulars
                            Maximum
Class Description           [H.sub.2]S,                     [CO.sub.2],
                            PP-psia                         PP-psi
I     Martensitic stainless PSL2 1.5                        1,000
      9% Cr--1% Mo L80      PSL3 0.5
      13% Cr L80            pH[greater than or equal to]3.5
      Super 13% Cr--15% Cr
II    Duplex stainless                                      No limit
      22 Cr/125, or         0.3
      25 Cr/125             1.5
III   High austenitic SS    15 [*]                          1,500
      2535/110
      2832/125
IV    Nickel-base alloys    30                              No limit
      2242/125              Alloy                           No limit
      2550/125              dependent [*]
      C276/125
Class CI,      Temp.,
      ppm      [degrees]F
I     60,000
               250
               300
II    120,000  450
III   250,000  350
IV    No limit 450
      No limit
(*.)Caution: Presence of elemental sulfur (S[degrees]) can radically
change cracking resistance of a particular CRA for a specific environment.
                     "Speed limits." [4] Maximum flow
                        velocity (ft/sec) withtout
                        erosion/corrison (dry gas)
Carbon steel         45
13 Chrome (standard) 190
22 Chrome            420
Higher alloys        Governed by sonic velocity