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CHAPTER INDEX

BULLETIN ITEM PAGE

16.1 INTRODUCTION 2

16.2 WELL INFORMATION MANAGEMENTARCHITECTECTURE 2

16.3 STORING WELL DOCUMENTS IN THEUNIX SERVER 2

16.4 DATA ENTRY INTO DIMS DATABASE 2

16.5 WELL DATA QUALITY MANAGEMENT 3

16.6 APPENDIX-1 4

16.7 APPENDIX-2 5

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16.1 INTRODUCTION

Well Data Management is one of the most crucial aspects of the well delivery process. Infact no well is delivered until the paper works are completed. . Needless to say that theonly way to know what went right or wrong in a well is simply by looking at the records.We can therefore judge the quality of a well by the quality of these records as containedby the company well database. The drilling business is capital intensive. It is thereforecritical that all information on what happened in the previous wells is properly analysedand the learning points carried along before committing large sums of money to drill anew well. This will result in better performance and less unit cost. It is therefore of utmostimportant that all well data generated in the process of well construction be properlyentered into the database and checked.

16.2 WELL INFORMATION MANAGEMENT ARCHITECTECTURE

Presently in Well Engineering Well information are stored in three broad places:

• Paper well files• Drilling Information Management System• Scanned documents in the UNIX machine viewed via the WEB.

The aim is to eliminate the paper files completely and have every thing stored in eitherthe document management system or electronic databases. It is not possible toeliminate the document management system, as most well information can not be storedin a database such as NNPC approval. The Drilling Information Management system isthe main Well Engineering Well Database as it houses above 90% of the well data. It istherefore important that this system be populated properly in the filed as anything lesscould lead to wrong decisions in the future.

16.3 STORING WELL DOCUMENTS IN THE UNIX SERVER

Well Information that can not be stored in the DIMS data base are scanned and stored inwell engineering UNIX server according to the approved Integrated Well File Structure.(See Appendix-1) This will include Well Head drawings, NNPC approvals, Detail wellprogrammes, etc. The document is then viewed through the well engineering web site inSPDC Intranet.

16.4 DATA ENTRY INTO DIMS DATABASE

As stated earlier, this database houses above 90 % of the well data. It is thereforeimportant that the system be populated properly. Roles and responsibilities of thevarious parties in entering and validating well data in the DIMS database are attached inAppendix 2. As can be seen in the appendix, the overall responsibility of ensuring thatthe DIMS is fully populated and hold only validated well data is the drilling Engineering,however over 90% of the data entry is done by the rig site supervisor. The support unit

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in the Well Technology Team is responsible for ensuring that the system is up andrunning always and that, users are properly trained.

16.5 WELL DATA QUALITY MANAGEMENT

The DIMS system has an in-built data quality checker and a visual query to assist inquality checking well data that are entered into it. Presently, these facilities are not asrobust as they are supposed to be. Most of the quality checking still has to be donemanually. It is the duty of the Drilling Engineer to ensure that only quality data are held inthe database. To do this, the engineer checks on daily basis, the completeness andcorrectness of the information being reported against his well. The Well Technologistcould assist him in automating some routing checks on need basis by writing visualqueries for those checks.

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Integrated Well fileStructure

Integrated WellfileDirectory Structure

Field-1

well-1

1.1Location

1.2.1EIP/EIA/E1.2.2CASHE1.2.3 EnvironmentalPermit to/from DPR

1.2Cash

1.3 Drillingapplications and1.4 Prospect maps/Prelim Investigatn1.5Space1.6Amplitude1.7 FieldAppraisal1.8 Seismicsituation/Contour1.9 Gasliftdesigns

[1] PreDrilling

2.1 WellProposal2.2 DillingProgramme2.3 Technicalspecification2.4 SWS &Coring2.5 Completion/Workover2.6Workover

[2] FunctionalSpecification

3.1.1Drilling3.1.2Workov

3.1 Dailyreport

3.2.1Drilling3.2.2Workov

3.2 Daily ReportDrilling

3.3.1 Reviews, Cost,Rig Time, DMR/WMR3.3.2 GeneralCorresp, DPR,3.3.3Completion,

3.3Miscellan

3.4.1Cementati3.4.2LOT3.4.3 Deviation:Plot,MMS,GYRO,MWD,

3.4CMT/LOT/D

3.5.1 DitchCuttings3.5.2WLTF3.5.3 CoreAnalysis/SW

3.5Formation

3.6.1Application to3.6.2 Permitfrom DPR3.6.3 End of wellreport to DPR

3.6Environment

3.7.1 SandConsolidation3.7.2Production3.7.3 Gravelpack/Stimulatio

3.7 SandControl/Producti

[3]Drilling/Completio

4.1.1Petrophysical4.1.2Stratigrphical4.1.3 ProcuctionTest /PVT analysis4.1.4Geochemical4.1.5Palynology/Palae4.1.6Correlation4.1.7 Drill daysvs depth plot4.1.8 Mud costvs depth plot4.1.9 Core &SWS

4.1Evaluati

4.2 End of well/Summary sheets4.3Completio

4.4.1 Finalwellhead4.4.2 Wellschematic4.4.3Tubing4.4.4Completion4.4.5 Bitrecords

4.4Mechanical

4.5Financial4.6Drilling/Workover4.7 Deviation surveys(single and multi shots)4.8Environmental4.9 WellHandover

[4] End ofwell reports

5.1 Production historysynopsis (+perf plots)5.2 Wellstatus5.3 Wirelineprogramme

5.4.1 Stimulation /Reconsolidation prog5.4.2 Dailystimualation

5.4Stimula

5.5 BHPAnalysis5.6 DPRCorresponden5.7 Permanentdownhole guage5.8 QWDPdocuments5.9 URCR orDUR Changes

[5]Product

6.1 FieldReviews/6.2Field6.3 Summarisedproduction data6.4 Reserves(changes)6.5MoRe6.6 Wellpressure

[6] WellReview

7.1Email/Tel7.2 Welltrade docs7.3Workover/Recomplet7.4 LPIProposal7.5 WellClose out7.6 Othercorrespondenc

[7]Other

8.1Abandonment8.2Program8.3 DailyAbandonment8.4Abandonmen

[8]Abandon

well-2

well-3

Field-2

Field 3

Area Southern

SwampOpukushi24

WellEngineering

Developmentdirectorate

Production &Development directorate

[field][well].[

Doc clas

[reportdate]

[source].

pdf

Opukushi24.3.2.1.09091994.SWW.PDF

Field=

OpukushiWell =

24Document = Daily drillingsupervisor drilling reportReport date =September 9, 1994Source = WellEngineering

[reportdate] optio

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APPENDIX-2 DIMS DAT A MANAGEMENT ROLES AND RESPONSIBILITIES

DATA ENTRYR O L E S & RESPONSIBILITIES

Reports Tabs DE DSV

Create New Well XWell Summary WELL INFO X

LOCATION X XEVENTS X XRIG/EQIP. XSIDETRACK XINTERVALS XFORM. TOPS XHOT NOTES XINTANGIBLES X

WELL PLANNINGGENERAL XPLAN OPS XINC. Plan XHOLE PLAN X XCSG PLAN X XMUD PLAN X XPRODUCTION X XSIDE TRACKS X X

CEMENTING XMATERIAL TRANS. XPIPE TALLY XPRESS SURVEY XWELLBORE EQUIP XDRILL STEM TEST XGEOLOGICAL SUM. XINCIDENT XLOGGING XSIDEWALL CORING XDAILY XCORING XFLUID HAULING XCOST EST & AFE XWell Head XPERFORATE X

NOTE: 1 SDE AS THE DATA VALIDATOR TO ENSURE THAT DATA HELD IN THE SYSTEMIS OF GOOD QUALITY 2 DATA CUSTODIAN (SWW-TEC) TO ENSURE SYSTEM AVAILABILITY ANDTHAT THESE ROLES ARE RESPECTED 3 WELL COMPLETIONS TEAM TO VALIDATE THE COMPLETIONSDIAGRAM IN THE SYSTEM