WELCOME TO PRESENTATION By Prosanna Hazarika Utpal Kr. Doley DY.CED WORK OVER OPERATION Theoperationsinvolvedinmaintenance andservicing,repairing, installationof down - hole production equipment etc in acasedhole/productionwellistermed as work-over operation Rig Selection Mobile work - overrigisusedfor this purpose. Therigis selected on thebasisoftotalexpectedloadtobe handled Rig in Operation in OIL Presently OIL has 13 nos. of in house work over rigs In addition 2 nos. of Chartered Hired work over rigs are in operation. Details of Mobile Work over rig SL. NO OUTFITRated Horse Power Date of commissioning Mast Height Work over Depth, 2 7/8" OD Tbg Drilling Depth,4 1/2" OD Drill Pipe1BHEL - B 235 HP, MEDIUM DUTY25/06/1988102 ft4572 M1830 M 2BHEL - C 235 HP, MEDIUM DUTY15/03/1989102 ft4572 M1830 M 3BHEL- D235 HP, MEDIUM DUTY31/03/1989102 ft4572 M1830 M 4CARDWELL - B250 HP, MEDIUM DUTY20/10/198396 ft4875 M1830 M 5CARDWELL - C250 HP, MEDIUM DUTY28/09/198396 ft4875 M1830 M 6CARDWELL- K - 600400 HP, HEAVY DUTY10/6/1985112 ft7315 M3000 M 7KREMCO K- 600 250 HP, MEDIUM DUTY18/02/198696 ft3658 M2000 M 8SKYTOP - B250 HP, MEDIUM DUTY4/4/197895 ft5185 M2286 M 9RG - 600 - A 600HP, HEAVY DUTY 21/02/2009 115 ft6000 M2500 M 10RG - 600 - B600HP, HEAVY DUTY 6/11/2008 115 ft6000 M2500 M 11RG - 600 - C600HP, HEAVY DUTY 25/11/2008 115 ft6000 M2500 M 12RG - 600 - D600HP, HEAVY DUTY 14/12/2008 115 ft6000 M2500 M 13RG - 600 - E600HP, HEAVY DUTY 7/10/2009 115 ft6000 M2500 M 14ZJ - 20 (CH)600HP, HEAVY DUTY14/04/2008115 ft6096 M2500 M 15ZJ 30 (CH)750HP, HEAVY DUTY23/02/2008124 ft7000 M3000 M Work-overRig Guy lines Reasons for Work-over To prevent water coning To prevent excessive gas production in an oil well To enhance production To control sand problems Re-completing a new zone / reservoir Completing in multiple reservoir Down hole Equipment & Cement repair Contd Reasons for Work-over To eliminate excessive water or gas production To repair mechanical failure down hole equipments To gain additional production through re-completion To evaluate potentially productive zones To clean scaling of Tubing & Casing To clean perforation plugging To replace production string Contd Reasons for Work over Tocontrolsandenteringwellborefrom formation To increase formation permeability To install artificial lift system, bottom hole pump etc. To repair or replace well head Conversion of well Work -over Operations Re-perforationorextentionof perforation Plug back and perforation higher up Isolation Repair Acidization Cleaning of production string Gravel pack Casing repair and recovery Contd Work over operations Milling Bridge Plug, Drilling Cement Plug Fishing Sand cleaning Well head repair or replacement Installation of artificial lift system, bottom hole heater etc. Cleaningofperforation,scalingincasing & tubing Work over operations Conversionoflowproducingwellto waterinjectionforincreasingreservoir pressure. Conversionofdeadwelltowater disposalwellforpumpingbackformation water producing along with oil Steps in Work-over Operation WellSelection Work-over Policy Preparation Site Preparation SecurityDeployment Static and Outfit mobilization & placement Work-over fluid preparation / collection Wellkilling Operationsas per well plan Contd Steps in Work-over Operation Rig-upMast Well killing Rig down of X-mass tree & rig up of BOP CirculationTripping ofTubing Specified jobs Final Running in of Tubing Rig down BOP Contd... Steps in Work-over Operation Rig up X-mass tree Enliventhewellandhandoverto Production Department. Rig down Mast MobilizetheRigtonewlocationasper plan Down Hole Tools & Equipments Rotovert / Scrapper Down Hole Tools & Equipments Flat Bottom Mill Down Hole Tools & Equipments Reverse Circulating Junk Basket(RCJB) Precautions during Rig-up& Rig- Down All loose parts and tools shall be securely fastened. Highprcirculatingfluidlinesshallbe securely bolted down During R/downing the well head shall be protected against damage from sliding or falling object. Theraisingandinstallationofheavy load shall be done during daylight hours unlessadequategenerallighting arrangementsareprovidedattheplace of work. Common Terms in Drilling & Work-Over rigs Derrick Platforms & floors Crown Block & Traveling Block Ladders & Guardrails & covers Emergency escape device Weight Indicator Safety belts Draw-works Cathead & cat line Tongs Casing lines MAIN EQUIPMENTS ARE W/O RIG including mast & substructure R / Table & Hoisting Equipments Staticincludingpumps,tanks, bunkhouses Precautions against Blowout BOP & Controlling UnitWell Control Fire fighting equipments Fencing & well security Safety Requirements An area within 30 m of the well should be danger zone.Allelectricalequipments shouldbede-energizedincaseof emergency. Adequatearrangementsforfirefighting should be provided & portablefire extinguishersareavailableatdifferent places.Crewmustbewellconversant withtheuseoffireextinguishers/fire pump GENERAL PRECAUTIONS Astandardrailingsshouldguardevery open sided D/Floor & D/board Rigshouldbeprovidedwithladder arrangements. Emergencyescapedevice&Fall prevention device should be incorporated. TousePersonalprotectionequipment (PPE) by every crew personnel. GENERAL PRECAUTIONS Thewellheadshouldbewellprotected against falling objects The D/Floor should be reasonably clean of oil, mud ,so as to prevent from slipping. Floorsaverandcrownsavermustbe checked every day. F/brake&Hydrometricbrakesystem should be working condition always. Casinglineinspectionmustbecarried out. Safety Practice Atthebeginningofeveryshifttheinstrumentsandcontrolsatdrillers console,D/Ws,pumps,casingline, catline&BOPshallbeexaminedbythe SDE&heshallsatisfyhimselfthatthese are in good working order No person remains in position of danger ator near the rotary table during operation. Thanks