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•-. nahretitc with some small ~es of oil ehale, wa dif- eolvtd and circulated acing lresh water through a small continuous wbinP (the 2-Ifl61n. dilution string had not been installed). The atcond plug, which consisted prirrurily of oiLehale pieta that had puled through the #~In. sloa In the 7•in. cuing, required drilling out. Tubing wu pal lod and a wart-wrapped lino wilt l f32-in. slots wu installed on dte irtS,dc of the slotted section of tht 7-in. cuing. Tht 3Yu-in. tubing std 2- I(161n, dilu- tion string war then installed. Phue 11 of the cream ,njeRan-feeovay period darted on May 76 and tonlinued to Lunt 77, 1971. Flow im- paitmen~ wu prutnt from the start, either at the recently insutlcd sheen ar in the ad}atent rubble-ftlld prottts volume. Afteran unsucttasful steamandhot-wataback- Ilush of the production tubing and wiry-wrapped lino, 750ga1 of tempmturc•reurded acid woe used. Rtaump- tan of steam tnlection soon met tht tempcraturt obju- tiscs at chctop and bottom of the process volume, Indicat- ing 1hal the acid treatment had been curetsslul First oil produnion wu noted on June 17, and it gndually increazed to 20 H,T) by June 2~. About this nme, the Clow impairment rcoccurrcd, with the pressure behavior indiratiny a down-hose reatnaion garlic in the 2-]llbin. tubing or in the annular fpscc between the bottom of this tubing and the top of s',e wire•wnpped doneC hoer. Failurt of the 2l+-m injrcdon tubing whllt rtuidizing the producton eidc uwd the loss of an tStututed 75 bbl of oil. Evaluation of the second acid trutmcnt (2,000 gal) showed success in removing much of flit flow impairment at or nr~ the production in[akt, but the dilution lint was found pluggd and the 3Yr- to 2-I/16-in. annulus wu rtytrincd. Phase II was tcrmi- rutd to considu alternative mrthtrdt far inaeuing the ttrnpaarurc,t thc~ttom of the cavity. PSsatt 111 of the cream injection rrsovery paiad atarttd on July 6, 1971, with injmion of sttyrrt down the produc- tarn robing in an atxmpt to inatasc tht oat production tax by eking the trmpc-•a;yrc of the process volume at tLc but A1d10ugh two backflow tyeles was a,ried out, atom was coon injcntd continuously and in an upwud direction. On July 12, 71 bbl of oil ^r niu nn~int from 0 to 30 patent were tnekved through the l+c.atcr-treater. 'fhu oil was darks, o(lowa gnvity Ulan pRvitws pro- duction. coouinra bitumen, and was ti~hdy emulsifid. Oil pmduclinn decreased rapidly (to 5 B/D on July IB) while incrrising in biwmcn wnrent. Biwmen upeet the controls in tf,c surface facilities and sated misroul)ngs of the diluent. lu solid content and rrsulunt density Causrd name o(Iht heavy oils to be (lowed with tht water to the disposal pit. Thar, solids wpold settle o: Inch out, and the oil and biwmcn would float. From July 1B, evidttfct inertued of plugting in the 2>'i-tn. tubing and of cream bypass u,g Somc evidence of bypusing from Ux. 7-in using to dst top of the cavity was availablt almoi; from the ttan of -nut 111. Phue Ili wu termi• oared on Aug. 3 for reuons of operating control: to relieve stresses that the c~pansion of the wellhesd had placed on the 355- and 2-1/I (r m. tubings and to wtss(der how to proceed in the prcence of concentrations of Hr5 that had ,nrreucd to the acttptable limits or the well deign. Aftc modi(icat;on to ttic wdlhtads for H,S compati• biliq• and iRrsi relic( of tubings, Phut IV of tht stem injection-rernvery period wu started on On. 19, 1971. ]t was ttrminactd a: lY_c. 14, 1971, after (low impairment occurred in the process volume and it had Ixcn estab- lished that there w>.s unasoidable communication sad I u.r. l Mti! f l I ...,a n, wt.sst mi i w,av s i F ~ v = ~ :- o EE ~ c ~~ ~ ~ E c ~ t a ~ ! a c ~ ~. a 'e ~ l l c 'v ax ~ ~ ~~~ •~ E z ~ ~ ~~ y$ ~ ~ i $z: ~s o ~ : i ~ l ~ ~ a c _ is is IA _ ce ~j ~ r $R y t .. - t A I , ~ i ^al i f r ^ r- r „ M• YFa /~ r.r ar,t /-, aai M OC b~ MC ,a,l R9 17-Summary d oper^toru- a~srape u+cy WnpararJ~ r• tm.. tOee 1(X7RN~1. pF P1:.1Rt)L~ZJM 7ECN.VOI OGt' r