slb. corrosion monitoring
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by
M. Watf a
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by
M. Watf a
I
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I - QUANTITATIVE EVALUATION OF TOTAL METAL LOSSES.
2 - COMPUTATION OF CORROSION RATES
3 - EFFICIENCY OF ANTI-CORROSION MEASURES
4 - OPTIMIZATION OF WORKOVER PROGRAMS
5 - ETERMINATION OF PROUCTION ANAMALIES
!. C!"#$% L&!'" .
b. (&)#$* +)& C!"#$% C)!$$&,#$%.
.
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Types of Corrosion Mechanisms
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y*/%&$ !+1" b&!6"& 7 +)/ /&,!+#8&,y "1!,, "#9& !$ *#776"& +)/6%)"+&&, !$* +)&/ 1&+!," . T)&"& !+1" / )y*/%&$ !/& +)& :/*6+ 7 )&1#!, !$*
&,&+/)&1#!, /&!+#$" +!'#$% :,!& !$* +)&y !/& 1/& :,&$+#76, !$* "+!b,& !+ )#%)+&1:&/!+6/&" !$* :/&""6/&" . y*/%&$ &1b/#++,&1&$+ #" +)& 1"+ 11$ 7 +)&
76/ . M"+ 7 +)& +)&/#&" +)!+ ;&/& :/:"&* !/& b!"&* $ ",#: #$+&/7&/&$& by*#"",8&* )y*/%&$ . T)#" ",#: #$+&/7&/&$& 1!y b& !6"&* by +)& !616,!+#$ 7
)y*/%&$ !+1" #$ 1#/8#*" !$* /&%#$" 7 1&+!, #1:&/7&+#$" );&8&/ +)&:/"& 1&)!$#"1 #" "+#,, 6$,!/#7#&* .
2.< - INTERGRANULAR CORROSION
N/1!,,y ;)&$ 6$#7/1 //"#$ 6/" +)& %/!#$ b6$*!/#&" :/8#*& ! 1!/-%#$!,,y ;&!'&/ //"#$ /&"#"+!$& +)!$ +)& 1!+/#= . ;&8&/ #$ "1& !"&" !$*
6$*&/ &/+!#$ $*#+#$" %/!#$ #$+&/7!&" !/& 8&/y /&!+#8& !$* #$+&/%/!$6,!/ /-/"#$ /&"6,+" . T)#" !::&!/" !" //"#$ !+ / !*>!&$+ + +)& %/!#$ b6$*!/#&"
;#+) &77&+#8&,y $ //"#$ 7 +)& %/!#$" . T)& :/b!b,& !6"&" !/& +)& :/&"&$& 7#1:6/#+#&" ;)#) !/& ,!+&* !+ +)& %/!#$ b6$*!/#&" !$* +)& &$/#)1&$+ 7 $& 7
+)& !,,y#$% &,&1&$+" / +)& *&:,&+#$ 7 "6) &,&1&$+" #$ +)& %/!#$ b6$*!/y !/&!" .T)& *#"$+#$6+y #$ 1:"#+#$ #$ +)& b6$*!/y !/&! 1!y "&+ ! 1#/ %!,8!$#
/&!+#$ !$* !$ !""#!+&* )#%) //"#$ /!+& :/&"" .
2.4
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3. Types Of Corrosion Measuring Tools
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3- - CORROSION MEASUREMENT
M$#+/#$% //"#$ I$ !"#$%" ,#$&/" !$* +6b#$%" #" #1:/+!$+ I$ /*&/ +I$#+#!+& 1&!"6/&" + !8#* !"#$% ,&!'" I$+&/-9$!, 7,6#* /"" 7,;" !$* I$ "1&!"&" ! ++!, ,,!:"& 7 +)& !"#$% ,#$&/ / +6b#$% . A$+)&/ b>&+#8& 7 //"#$1$#+/#$% 3 + &8!,6!+& +)& &77##&$y 7 +)&. !$+#//"#$ 1&!"6/&" :/!+#"&*?&.%. 7,6#* #$)#b#+/" !+)*# :/+&+#$ &+... 1"+ 7 ;)#) !/& &=:&$"#8& +#$"+!,, !$* 1!#$+!#$ . I$ +)#" ;!y &=:&$"#8& !$+#//"#$ :/%/!1" !$ b&1$#+/&* + "&& +)/ &77&+#8$&"" . - M/&8&/ I+ #" !,;!y" &$1#!, + )!8& !*&+!#,&* !$!,y"#" 7 +)& *;$),& //"#$ !$* !"#$% *!1!%& b&7/& 11&$#$%;/'8&/ " +)!+ /&1&*#!, ;/' 1!y b& *#/&+&* + +)& *!1!%&* I$+&/8!," .
O$& +)& ;&,, #" '#,,&* !$*.+6b#$% #" /&18&* +)& ;/'8&/ :/%/!1 "+!/+" by
/6$$#$% //"#$ ,%" + )&,: %6#*& +)& "6b"&@6&$+ ;/' . T)&/& )!" !,;!y" b&&$ !$&&* 7/ !$ !6/!+& +&)$#@6& + 1:6+& ++!, 1&+!, ,""&" !$* //"#$ /!+&" .T)#" $&&* b&1&" 1/& !6+& !$* $&&""!/y !" ! 7#&,* b&1&" ,*&/ !$* //"#$/!+&" !/& !&,&/!+&* by :/*6+#$ !$1!,#&" "6) !" I$/&!"&* ;!+&/ 6+ #$>&+#$;!+&/ b/&!'+)/6%) !$* #,;!+&/ $+!+ 18&1&$+" &":!,,y I7 +)& ;!+&/ #""!,#$& . C//"#$ /!+&" +&$* + b& &=:$&$+#!, ;#+) +#1& . E=&:+ ;)&$ !$+#-//"#$ 1&!"6/&" !/& 6"&* P/:/+#$!,,y )#%)&/ //"#$ /!+&" !/& $+&* !" +)&;&,, %&+" ,*&/ .
A+ :/&-"&$+ 1!$y 7/1" 7 //"#$ 1$#+/ ,%" !/& #$ 6"& I$ +)& #, #$*6"+/y . I$ %&$&/!,
+)& /&"6,+" 7 1"+ 7 +)&"& ,%" !/& +/&!+&* #$ ! @6!,#+!+#8& 1!$$&/ . T)#"B #" *6& + +)& %/&!+$61b&/ 7 8!/#!b,&" %8&/$#$% +)@ :/#$#:,&" !$* :)y"#" 7 1&!"6/&1&$+ 7 &!) +, .
T)& 7,,;#$% #" ! "611!/y 7 +)& 8!/#6" //"#$ 1&!"6/#$% +&)$#@6&" #$ 6"& .
3. PIPE ANALYSIS TOOL PAT -
2 "&+" 7 :!*" !/& !//!$%&* #$ !$ 6::&/ !$* ! ,;&/ !//!y 7 0 :!*" &!) ;#+) "1& *&%/&&
7 8&/,!: . +; 1&!"6/&1&$+" !/& 1!*& .
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4.
A6/!+& ETT T#1&-L!:"&
C//"#$ M$#+/#$%
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