Sandface Completion for a Shallow Laminated Gas Pay With High Fines Content
- Neil S. Hadfield (Sarawak Shell Berhad) | Jan H. Terwogt (Shell Malaysia) | Aart Van Kranenburg (Shell) | Sharifudin Salahudin (Halliburton Energy Services Group) | Kimberly A. King (Halliburton Energy Services Group)
- Document ID
- Society of Petroleum Engineers
- SPE Drilling & Completion
- Publication Date
- September 2007
- Document Type
- Journal Paper
- 2007. Society of Petroleum Engineers
- 2.2.2 Perforating, 2.4.6 Frac and Pack, 2.4.4 Screen Selection, 1.6 Drilling Operations, 1.10.1 Drill string components and drilling tools (tubulars, jars, subs, stabilisers, reamers, etc), 2.2.3 Fluid Loss Control, 4.6 Natural Gas, 2.4.3 Sand/Solids Control, 4.3.4 Scale, 5.4.10 Microbial Methods, 2 Well Completion, 1.10 Drilling Equipment, 2.7.1 Completion Fluids, 4.1.5 Processing Equipment, 1.2.3 Rock properties, 1.6.9 Coring, Fishing, 1.8 Formation Damage, 4.2.3 Materials and Corrosion, 1.6.1 Drilling Operation Management, 5.6.4 Drillstem/Well Testing, 4.1.4 Gas Processing, 1.6.6 Directional Drilling, 5.6.8 Well Performance Monitoring, Inflow Performance, 4.1.2 Separation and Treating, 2.4.5 Gravel pack design & evaluation, 3.3 Well & Reservoir Surveillance and Monitoring
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The Shallow Clastics field operated by Sarawak Shell primarily targets twoshallow gas-bearing reservoirs, H1 and H2, at approximately 2,650 ft truevertical depth (TVD). An appraisal, early-producer well was drilled with adeviated wellbore through the H1/H2 targets, and a completion design consistingof a cased, perforated, and commingled completion inside 95/8-in.casing was implemented. The sandface-completion design consisted of alarge-outside-diameter (OD) expandable sand screen with a 150-µ-weave openingacross the two zones. Upon completion, the reservoirs were cleaned up through atemporary well-cleanup and test-facility to test productivity and evaluate theintegrity of the downhole sand-exclusion installation. Fines production,possibly caused by a failure of the expandable screens, steadily increased tothe extent that the well was deemed unproducible to the facilities.
A re-evaluation of the sand-exclusion method that included more extensivecore analysis and the types of wells that would be suitable for development ofthe H1/H2 reservoirs was initiated. From this review, the operator and aservice/engineering company were able to develop an innovative sand-exclusionmethod that combined several new technologies.
To date, four wells have been completed with the new sand-exclusion methodand well configuration chosen to address the completion needs. These have beentested and, to date, have proved to be operating satisfactorily. This paperwill review the evaluation that led to the revised sandface-completion design,the field implementation of the design, and the key installation successfactors that were required. Results and a summary of best practices from theinitial installations also will be summarized.
Sarawak Shell's Shallow Clastics field consists primarily of two shallowgas-bearing reservoirs, H1 and H2, at approximately 2,650 ft TVD. Thesereservoirs are laterally extensive, covering an area of 200 km2 withan estimated gas in place (GIP) in excess of 2 Tcf. The reservoirs aremade up of a sequence of highly laminated sand and shale deposits withsignificant sand-size variability and high fines content. Being highlyunconsolidated, downhole sand exclusion is mandatory. The primary drivemechanism is a depletion drive based on the weak aquifers seen in existingfields in the area. The Shallow Clastics reservoirs overlay deeper CentralLuconia carbonate gas reservoirs, which are already on production with furtherfields in development; therefore, a gas-processing and gathering system wasalready in place. Gas from all of these fields is produced to the MalaysianLiquified Natural Gas (MLNG) plants at Bintulu, East Malaysia. Production fromthe Shallow Clastics field is intended to counteract decline from other fieldsand is critical to maintaining the security of the supply to MLNG.
Significant log data (Fig. 1) on the Shallow Clastics field weregathered from the appraisal and development wells of the deeper carbonate gasreservoirs; however, core data were limited to what could be generated from asingle poor-quality core from E11-SC1. A dedicated Shallow Clastics appraisal/early-producer well (E11-SC2) had been drilled with a deviated wellbore throughthe H1/H2 targets, and a completion design consisting of a cased and perforatedcommingled completion inside 95/8-in. casing had been implemented.The sandface-completion design consisted of a large-OD expandable sand screenwith a 150-µ-weave opening across the two zones. Upon completion, thereservoirs were cleaned up through a temporary well-cleanup and -test facilityto test productivity and evaluate integrity of the downhole sand-exclusioninstallation. Fines production, possibly caused by a failure of the expandablescreen, commenced during the cleanup and steadily increased to the extent thatthe well no longer could be produced.
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