DRILLING PRACTICESCOMPLETION AND WORKOVER

INTRODUCTION

IDEAL COMPLETION

LOWEST COST

MEETS DEMANDS PLACED ON IT DURING PRODUCTION LIFE

GENERALLY THE SIMPLER THE COMPLETION THE GREATER ITS RELIABILITY WELL WORKOVER MAY ALSO BE CONSIDERED PART OF COMPLETION DESIGN

WELL COMPLETION OPERATIONS WILL INCLUDE

SAND CONTROL

TUBING COMPLETION STRING / HANGER INSTALLATION

SUB-SURFACE SAFETY INSTALLATIONS (SSSV, SCSSV,TRSCSSV)

XMAS TREE INSTALLATION

PRODUCTION PACKER SETTING

PERFORATING

BASIC COMPLETION TYPESOPEN HOLE PRODUCTION CASING PRODUCTION LINER PRODUCTION GRAVEL PACKED PRODUCTION

No downhole flow control or isolation possible Unsupported producing formation

Producing zone(s) hydraulically isolated by casing cement More options for selective treatment and isolation

Similar to casing production but with savings associated with shorter casing string and smaller hole diameter through reservoir

Dictated by formation type, selectivity of treatment and subsequent isolation difficult

BASIC COMPLETION TYPESOPEN ENDED (SUSPENDED) TUBING PRODUCTION BASIC PACKER PRODUCTION PACKER WITH PERFORATED TAIL PIPE

PACKER WITH NIPPLES, SLIDING SLEEVE AND SAFETY VALVE Production safety valve

Downhole Isolation (plug) Downhole Instrumentation (gauges)

Well kill capability but no control of annular fluid level and possible exposure to corrosion

Well kill capability when packer is released

Downhole Isolation (plugs) above and below packer Circulate through sliding sleeve without packer release

Casing string protected from corrosion and production stresses by inhibited packer fluid

MULTIPLE ZONE

INTERVAL SEGREGATION

CONCENTRIC STRINGSMULTIPLE STRING TWIN STRING DUAL COMPLETION SINGLE STRING DUAL COMPLETION

NUMBER OF ZONES COMPLETED

SINGLE ZONE

INTERVAL CO-MINGLINGSTANDARD ELECTRIC SUBMERSIBLE PUMP PLUNGER LIFT GAS LIFT HYDRAULIC PUMP ROD

COMPLETION CONSIDERATIONS

MODE OF PRODUCTION

FLOWING (SINGLE STRING)

ARTIFICIAL LIFT

HIGH RATE LINER HIGH PRESSURE TEMPORARY,SIMPLE LOW COST TUBINGLESS

INTERFACE BETWEEN WELLBORE AND RESERVOIR

PERFORATED CASING

INTERNAL GRAVEL PACK

PERFORATED LINER

STANDARD

EXTERNAL GRAVEL PACK

UNCEMENTED LINER

RESIN INJECTION WIRE WRAPPED SCREEN

OPEN HOLE

SLOTTED PIPE

WORKOVERDEFINITION OF A WORKOVER

TO PERFORM ONE OR MORE OF A VARIETY OF REMEDIAL OPERATIONS ON A PRODUCING WELL TO TRY AND INCREASE PRODUCTION

WELL MAINTENANCE MINOR WORKOVERSWIRELINE & TFL OPERATIONSDRIFT RUN PARRAFIN CUTTING SAND BAILING INSTALL PLUG PRESSURE TESTING SSSV REPAIRS SLIDING SLEEVE FISHING ROUTINE WELL KILL THRU TUBING LOGS RE-PERFORATION CEMENTING KICK-OFF THRU-TUBING BRIDGE PLUG KICK-OFF NON-ROUTINE WELL KILL HYDRATE & SCALE CLEAN-OUT MINI-FRAC REMEDIAL THRU-TUBING GRAVEL PACK FISHING CEMENT PLUG ACIDIZING SAND CLEAN-OUT

PUMPING OPERATIONSCHEMICAL INJECTION

COIL TUBING OR SNUBBING OPSCHEMICAL INJECTION ACIDIZING

MAJOR WORKOVERS

REPAIRS

RECOMPLETIONS

REMEDIAL CEMENTING

UPHOLE

GRAVEL PACKING DEEPEN SSSV REPAIRS

CASING AND TUBING LEAK REPAIR

SIDETRACK

FISHING

NEW TUBING REPLACEMENT

CONVERT TO INJECTION