Slide 1

ZHD A/102Rig: SaksonAfter Action Review (AAR)24th March 15

1Well Summary & objectiveWell NameZHD A-102RigSaksonWell TypeAppraisal/Development Heavy Csg designWell TrajectoryDirectional (14 inclination)TargetCH7 CH12Plan Completion TypeSingle completionPlan Well TD4200mActual TD3991mSpud Date2nd Sept 2014Release DateThe well is not finished yetActual Total Days till now200 D (Plan: 90 days ),110 days behind

ZHD A/102 Actual Well Design

7 Quantum PKR @ 3640mEOT @ 3656 m 13 3/8 casing @ 2387 m20 casing @ 500 m9 5/8 casing @ 3060 m7 Liner shoe @ 3734 m4 Liner shoe @ 3945 m4 TOL @ 3718 m7 TOL @ 2944 mPBTD @ 3932 m9 5/8 Quantum PKR 2872m3 X 2 SSD @ 2892m

9 5/8 XMP PKR @ 2833mRan w/ WL got obstruction @ 3370m

TOF @ 3733m

Clean out to @ 3736mProgress chart20 casing shoe @ 500m13 3/8 casing @ 2387mAve ROP for 17 Sec: 10 mphAve ROP for 12 1/4 Sec: 15 mph

9 5/8 casing @ 3060m7 Liner shoe @ 3740 m4 Liner shoe @ 3945 mAve ROP for 8 1/2 Sec: 8 mphAve ROP for 26 Sec: 14 mphPT versus NPTNPT distributionComp.Time (D)DescriptionDragon40Well control fishing pooh w/ completion - WOWDEW287 liner dropSakson22Rig repairSLB-Mud4Conditioning the mudSLB-DM2Gyro failureTime (Days)PT104NPT96Total200Lessons LearntProblemReasonAction TakenRecommendationsDropping 7 liner while RIHThe liner engineer used improper shear pinsFailed to recover the liner and cemented same by cement retainerThe DSV should review the shear values with the liner engineer in the pre job meetingWell flow after carry out the negative test for 7 liner top PKRThe liner top PKR failed due dropping of liner and improper cementationSet another liner top PKR (tie back) and leaked as well due to damage in the PBRPerformed remedial cement jobs through the liner hangerMake sure that the liner running procedure is implemented as per programStuck while Drilling 6 holeUsed mud weight similar to ZHD-21 and Lam (CH-12) but was insufficient for hole stabilityIncreased the mud weight up to 17.4 ppg to overcome the formation instabilityThe ZHD A-102 will be taken as offset for the upcoming wells on the same platformLessons LearntProblemReasonAction TakenRecommendationsKCL/Glycol is not the suitable mud system to be used in the reservoir sectionOpen hole logs required low salinity mudUsed ultra-drill mud type, but it has a weight limitationBetter mud system to be used with ability for higher mud weight above 17 ppgPooh with completion stringTo check the down hole gauges after killing operationFound the completion string has been parted and buckled due to high bottom hole pressureUsing high brine weight for such wellsHighlights & lowlightsHighlights:Drilled the well free of problems till 6 holeCemented 13 3/8 and 9 5/8 casing successfully and achieved 100% ZIThere is no SCP in annulus B & CUsed new mud system to meet the reservoir requirementsLowlights:The NPT is high in this wellThe liner dropped while RIH due to human errorEither the 9 5/8 Quantum packer or 4 liner has been leaking while running the upper completion

Buckled 3 TBGPulled 9 5/8 XMP PKRParted 3 1/2 TBG