This document contains confidential information, which is the exclusive and proprietary property of BP America Inc . and affiliates. affiliates. In whole or part, this document or its attachments MAY MAY NT !e reproduced !y any any means, disclosed or used for any purpose without the express written permission of BP America Inc. or affiliates.
%&' Purpose(Scope Thi ection "rovide guideline for the Well P.4 on how the coiled tubing a"ect of acidizing on the 5orth Slo"e3 Thi "rocedure #ut be read in con%unction with Acid Acid Safety and General Rig up7) up7) Acidizing Acidizing Flow Back”, and Back”, and Acidizing Acidizing Risk Analysis73 Analysis73 Rather than du"licating #an' ection) co##on language ha all been #oved to Acid Acid Safety and General Rig up73 up73
)&' e*initions ADW!P8 Ala+a Drilling and Well !"eration Polic' CT9 Coiled Tubing 9nit WS$ 8 Well Site $eader ;!P ;lowout "reventer
+&' General Re,uirements Thi ection "rovide infor#ation o n the "lanning) e
-&' .ey Responsibilities Well !"eration Su"ervior i: To deignate the "eron to u"date #anual a necear' to incor"orate new "olicie o r "rocedure Well Site $eader are: Re"onible for identif'ing and ub#itting change to the "rocedure and #ethodolog' baed on new technolog' and new and better wa' of "erfor#ing wor+ 9"date the #anual baed on change a a reult of Root Caue =nvetigation
2&' Procedure There are two t'"e of acid %ob t'"icall' done with coiled tubing acid wahe and acid ti#ulation3 The %ob are different but both involve uing acid and therefore have ri+ aociated with acid3 Review the P. 0anual ection Acidizing Risk Analysis7) Acid Safety and General Rig Up7) Rig-up and Well ntry !rocedures7 -for rig8u" diagra#/) and "Acid Flow#ack to !orta#le Separator, $anks, or to !roduction” 2&% Tubing Acid Wash While a tubing acid wah can be "erfor#ed with a CT9 or fullbore) wahing with coil allow certain area of buildu" to be targeted3 Co#"ared to bullhead -fullbore/ treat#ent) coiled tubing "rovide accurate acid "lace#ent) a nd the %etting action re#ove cale #ore efficientl'3 ;ullheaded acid #ight "end on #ill cale or tubing debri on it wa' to the cale) wherea acid "u#"ed down coil doe not3 There are three cae to conider: %inor a&ount of car#onate scale only in t'e tu#ing, or else (ust a "pickle” of &ill scale re)uired prior to full#ore sti&ulation* Fullbore "u#" G (@H of a tubing volu#e of 1@H Cl with 1*H I'lene) di"lace with dead crude or dieel for h'drotatic lightening3 %odest a&ount of car#onate scale only in t'e tu#ing and + or pro#le& #uild-ups in (ewelry Conider firt etting a tubing tail "lug if 'ou can get one down3 9e coiled tubing3 Circulate fro# end of tubing and ta+e return at urface 1:13 -5ote that h'drotatic #a' #a+e thi difficult if a "lug can not be etJ #a' rebbl of 5( to "revent well fro# going on a vacuu#3 A another o"tion 'ou #a' alo circulate fro# the tubing tail #ulti"le tubing volu#e of acid3 eay scale in tu#ing 9e a #ill and #otor) and #ill out with the well flowing3 ou will "robabl' need to follow u" b' "erfor#ing a tubing wah with acid over the ,$04 or other %ewelr'3 %ilne !oint S! Wells =n 0ilne "oint acid oluble cale i a co# #on "roble# with .SP lifted well3 =n o#e cae) an acid wah will cure the "roble# and "rovide additional "roductive life before an .SP wa" i reor anded u") coiled tubing hould be ued to de"lo' the acid3 A cleanout will be "erfor#ed with hot dieel) ?Cl) and g el wee" a necear') followed b' a #all acid "ill b' %etting down at #aKi#u# rate on the to" of the .SP) tagging the .SP occaionall') allowing the acid to oa+) and re"eating the "roce3 T'"icall' the acid volu#e i all "u#"ed into the coil and a oa+ "eriod i done once half of the volu#e ha been di"laced fro# the coil3 The %etting and tagging "roce i re"eated during the econd half of the acid volu#e 3 =f the .SP will tart) the .SP i ued to lift the acid out of the well and return the well to "roduction3 =f the .SP will not tart then once all acid ha been %etted or wor+ed into the .SP) then the coil i ued to circulate out re#aining acid to a tan+3 Prior to "u#"ing acid) the return tan+ #ut have @* to 1** bbl of neutralizer and defoa#er3
/P Con*idential and 0 ) ''1 /P America !nc& Control Tier: 2 8 ADW Reviion Date: >>(*1* Docu#ent 5u#ber: 9PS89S8A?8ADW8W$S8ADW8D!C8***@182 Print Date: *>1B>1* PAP.R C!P=.S AR. 95C!5TR!$$.D3 T=S C!P EA$=D !5$ AT T. T=0. !F PR=5T=5,3 T. C!5TR!$$.D E.RS=!5 !F T=S D!C90.5T CA5 ;. F!95D AT htt":>>e"ortal3b"web3b"3co#>he
RP: Acidizing with Coiled Tubing
Page of 6
2&) 3ob Preparation 4 General 13
=f a CT9 tubing wah i "lanned) dicu the need for either etting a "lug in the tail"i"e or caing>liner to allow acid to be circulated fro# the well3 S"ea+ with Wireline and enure "roviion i #ade with the "lug to tolerate o#e debri on to"3 The alternative i to li"trea# in 5 ( or tage of dieel to +ee" the overall h'drotatic "reure low3 (3 CT9 ti#ulation do not re27 !D) utilize two 24 to @4 rigid ;A eKtenion3 Thi reduce reidual bending iue) and hel" to #ini#ize nozzle interference with u"et in the co#"letion uch a ga lift #andrel3 9e a ball8dro" nozzle) which ha larger hole) if diverion i to be ued3 Do 5!T "u#" benzoic acid fla+e diverterJ eK"erience ha hown it will "lug the nozzle3
2&+ Rig up 13 The rig u" will include a flow cro "lu#bed to the "ortable tet e"arator or tan+ -if a""licable/3 While called a flow cro) thi i actuall' a flow tee a there i onl' one ide outlet3 Schlu#berger will rig u" coil e#in3 For #ot full tubing acid wah %ob) 'ou will be retricted b' the #aKi#u# rate through the tubing and contact ti#e of the acid with the coiled tubing will be greater than 1@ #inute3 Pu#" the entire acid v olu#e down the coil tubing3 Di"lace the acid to urface with two tubing volu#e of water) with dieel or 5( if needed) to aure the acid i fluhed fro# the "roduction tubing3 .* $o treat a specific interal of scale/ /P Con*idential and 0 ) ''1 /P America !nc& Control Tier: 2 8 ADW Reviion Date: >>(*1* Docu#ent 5u#ber: 9PS89S8A?8ADW8W$S8ADW8D!C8***@182 Print Date: *>1B>1* PAP.R C!P=.S AR. 95C!5TR!$$.D3 T=S C!P EA$=D !5$ AT T. T=0. !F PR=5T=5,3 T. C!5TR!$$.D E.RS=!5 !F T=S D!C90.5T CA5 ;. F!95D AT htt":>>e"ortal3b"web3b"3co#>he
RP: Acidizing with Coiled Tubing
Page 2 of 6
a/ et the interval to be treated at #aKi#u# rate uing one half of the acid volu#e while reci"rocating the coiled tubing acro the treat#ent interval3 Reci"rocate 1* to (* feet above and below the treat#ent interval to co#"enate for an' de"th error3 Di"lace the acid with filtered (H ?Cl or a ?Cl "acer and #ethanol in cold weather3 b/ Par+ the nozzle above the treated interval and let the acid oa+ for one hour3 c/ Re"eat the %etting and oa+ "rocedure with the re#aining acid3 Di"lace acid to urface with two tubing volu#e to aure the acid i fluhed fro# the tubing3 d/ =f the well doe not have ga lift) an alternative to 5( i to tail in with crude or dieel to #a+e it eaier for the well to be +ic+ed off3 3 =f there i a "lug et in the well) clean out down to it to #a+e retrieval eaier 23 Pull out of hole with coiled tubing3 When necear') freeze "rotect well) coiled tubing) urface line) and flowline3 @3 ,et the acid flowed bac+ a oon a "oible to re#ove an' "ent acid fro# the well and "revent corroion of tubular3 2&2 5$ecution 6 Acid Stimulation @3 $ift/) hut down and let the acid oa+3 Thi allow the acid to "enetrate the "erforation and ho"efull' to brea+ the# down3 =f thi doe not i#"rove the treat#ent) 'ou can eKceed fracture gradient #o#entaril' encouraging "erforation brea+down3 ou #ut) however) hut down and oa+ again) while the fracture heal3 3 After 'ou have "u#"ed the final fluh) "ull out of the hole with coiled tubing3 When necear') freeze "rotect well) co iled tubing) urface line) and flowline3 At urface) rig down Schlu#berger e( of the coil volu#e3 Thi can be #iKed in the Schlu#berger di"lace#ent tan+ if a neutralizing olution truc+ i not on location3 Thi i eaiet "u#"ed while "ulling out of the hole a "art of the coil freeze "rotection "roce) di"lacing all the oda ah olution in the wellbore at about 1 b"#3 Again) thi te" onl' need to be done if there will be a de la' of #ore than four or five da' before the coil i to be ued in "u#"ing large volu#e of fluid3 Definitel' thi #ut be done if the reel will be tac+ed3 /P Con*idential and 0 ) ''1 /P America !nc& Control Tier: 2 8 ADW Reviion Date: >>(*1* Docu#ent 5u#ber: 9PS89S8A?8ADW8W$S8ADW8D!C8***@182 Print Date: *>1B>1* PAP.R C!P=.S AR. 95C!5TR!$$.D3 T=S C!P EA$=D !5$ AT T. T=0. !F PR=5T=5,3 T. C!5TR!$$.D E.RS=!5 !F T=S D!C90.5T CA5 ;. F!95D AT htt":>>e"ortal3b"web3b"3co#>he
RP: Acidizing with Coiled Tubing
Page @ of 6
2&8 Risk Analysis See Acid Safet' and ,eneral Rig u" for acid8"ecific ri+
/P Con*idential and 0 ) ''1 /P America !nc& Control Tier: 2 8 ADW Reviion Date: >>(*1* Docu#ent 5u#ber: 9PS89S8A?8ADW8W$S8ADW8D!C8***@182 Print Date: *>1B>1* PAP.R C!P=.S AR. 95C!5TR!$$.D3 T=S C!P EA$=D !5$ AT T. T=0. !F PR=5T=5,3 T. C!5TR!$$.D E.RS=!5 !F T=S D!C90.5T CA5 ;. F!95D AT htt":>>e"ortal3b"web3b"3co#>he
RP: Acidizing with Coiled Tubing
Page 6 of 6
7&' .ey ocuments(Tools(Re*erences Acid Safet' and ,eneral Rig u") 9PS89S8A?8ADW8W$S8ADW8D!C8***@82 Acidizing Ri+ Anal'i) 9PS89S8A?8ADW8W$S8ADW8D!C8***2182 Acid Flowbac+ to Portable Se"arator) to Tan+) or to Production) 9PS89S8A?8ADW8W$S8ADW8 D!C8***2*82 Tubing wah) Reervoir Sti#ulation) or Sti#ulation with ;all Diverter) 9PS89S8A?8ADW8W$S8 ADW8D!C8**1L282 Coiled Tubing Rig89" and Well .ntr' Procedure) 9PS89S8A?8ADW8W$S8ADW8D!C8***2@82 CT9 !"eration 8 Proble# Procedure) 9PS89S8A?8ADW8W$S8ADW8D!C8***2L82 ;P Ala+a P. 0anual
Re"ision etails !riginal =ue Revied for new u"date to "olic' Revied A""roving Authorit' and Cutodian3 .Ktended neKt review date3 Changed S!P to RP3 Added: Ste" "age () Pot ob Rig Down "age B Revied for new bet "ractice 8 #odified neKt review date3 All general acidizing #oved to Acid Safet' and ,eneral Rig u" docu#ent3 Changed to reflect current flowbac+ "ractice Add ;P Confidentialit' State#ent
