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E N H A N C I N GPRODUCTIVITYCoiled Tubing SolutionsSolve Downhole Problems WithReliable, Cost-Effective TechnologyBaker Oil Tools
Coiled Tubing HandbookThe global oil and gas industry is using coiled tubing for anever-increasing array of well intervention projects. Coiledtubing offers a number of operational and economic advantages,including: live well intervention, elimination of well killand potentially damaging heavy-weight kill fluids, reducedoperational footprint, horizontal intervention, and the abilityto intervene without a rig. These advantages have led to thedevelopment of truly fit-for-purpose coiled tubing systems fromthe industry’s largest provider of coiled tubing well interventionsolutions – Baker Oil Tools.Baker Oil Tools offers its clients an unparalleled selection ofcoiled-tubing-conveyed intervention products, services andsolutions with which to approach individual well requirements.This handbook was developed to helpour clients determine which systemsand services will best meet the needsof a particular application. For thatreason, we have designed the handbookto highlight system capabilities withineight distinct intervention areaswhere coiled tubing can offer a highlyeffective and cost-efficient alternative.These eight categories are: WellCleaning, Fishing and Milling, ZoneIsolation, Stimulation and Fracturing,Sand Control Completions, FlowManagement, Plug and Abandonment,and Sidetracking and Re-entry.Coiled Tubing Well
Coiled Tubing Sections3. 3. 4. 5. 6. 7. 9. 10Recovering Tools with Downhole Vibration Technology . . . . .Recovering Tools with Hydraulically Activated Fishing Tools . . .Recovering Coiled Tubing . . . . . . . . . . . . . .Removing and Recovering Obstructions . . . . . . . . . .Cutting Pipe. . . . . . . . . . . . . . . . . .Milling . . . . . . . . . . . . . . . . . . . .METAL MUNCHER Milling Assembly with Magnetic Chip CatcherOPTICUT Mills . . . . . . . . . . . . . . . . .Vortech Pulsating Bit Sub . . . . . . . . . . . . . .Fishing and Milling11Zone Isolation11121416171820212223Through Tubing . .Retrievable Bridge PlugRetrievable Packer.Straddle Systems . .Monobore . . . .Stimulation and Fracturing232425262729Through Tubing ISAP. . . . . . . . . . . . . . . . . . 29QUIK Drill Composite Products . . . . . . . . . . . . . . . 31Retrievable Bridge Plug . . . . . . . . . . . . . . . . . . 34Sand Control Completions.35.Increasing Gas Velocity While Reducing Water ProductionVelocity and Straddle Systems . . . . . . . . .CT Tension Packer . . . . . . . . . . . .Inflatable Straddle System . . . . . . . . . .Scale Inhibition. . . . . . . . . . . . .Production/Injection Logging . . . . . . . . .Selective-Zone Completion . . . . . . . . . .Shifting Sliding Sleeves . . . . . . . . . . .Nipple-Less Completion Technology . . . . . . .Flow Management36373839404345Plug and Abandonment46474950505152535457Inflatable Permanent Bridge Plug . . . . . . . . . . . . . . . 58Permanent Cement Retainer. . . . . . . . . . . . . . . . 59Monobore . . . . . . . . . . . . . . . . . . . . . . 60Sidetracking and Re-entry161.62636465656874Sidetracking andRe-entrySlimhole Casing Exit Technology . . .Restricted-Bore Whipstock System . .Slimhole Milling Assemblies . . . .Open-Hole Completions . . . . . .Open-Hole Liner Systems . . . . .Coiled Tubing Drilling . . . . . .Drill Bits - Hughes Christensen SolutionsPlug andAbandonment.Flow Management.SM.Sand ControlCompletionsVent Screen System . . . .Squeeze-Pack System. . .Wash-Down System . . . .Circulating Gravel Pack SystemSand Control Screens . . . .FRAQ PAQ Fluid Systems . .Stimulation andFracturing.Zone Isolation.Fishing and MillingSandtrap System . . . .Debris Catching . . . .Underreaming . . . . .Impact Drilling . . . . .Mechanical Scale Removal .High-Pressure Jet Washing .Vortech Pulsating Jetting ToolWell CleaningWell Cleaning
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Well CleaningSandtrap SystemThe Sandtrap System is a highly efficient method of cleaning out largevolumes of sand or proppant from a wellbore where sufficient annularvelocity cannot be obtained to circulate the sand out conventionallyusing coiled tubing. The system incorporates jet pump technology andis powered by water or nitrogen. No foam is required. The SandtrapSystem is extremely cost effective compared to alternatives wherefoam and chemicals are used. It is also extremely efficient and requiresminimal time. The sand is removed as the tool is lowered, creating thespace to continue the process. Production can be resumed immediatelyafter cleanout.The system comes in 5-3/4 in. and 3 in. OD sizes. Each application isflow modeled on an individual well basis.Cleanwellborefluid entersthroat andmixes withpowerfluidKey features and advantages Suitable for all sand / proppant types No foam system required for effective wellbore cleanout Water, nitrogen or mixture can be used as power fluid Fast, efficient operationReturn towellborevia exitportsCase History North SeaObjective: A high volume of sand accumulated in a well causing decline in production. Bottomhole pressure in thewell would not hold a fluid column. The sand neededto be cleaned out of the well, with minimum shut-intime requested.Sandfiltered outPassesthroughgravelscreenCT Solution: A 5-3/4 in. OD Sandtrap System with extensions waschosen since a minimal amount of fluid would beintroduced into the well and sand could be capturedwithout circulating all the way up to surface, whichwould require a foam system.Result: The full 100% tool capacity was filled with sandduring the first two runs. During the third run only73% of the capacity was filled, indicating that thesand in the well nearly emptied. This was confirmedwith the fourth run only recovering 0.5 gallon ofsand. A total of 265 gallons of sand was recoveredduring the operation.Checkvalve trapssand insidetoolWellborefluid drawninto toolJet Pump Sand CleanoutSystem3Well CleaningA clean wellbore is not only a prerequisite for trouble-free well testingand completion, it also helps ensure optimum production for the life ofthe well. Baker Oil Tools’ coiled-tubing-conveyed well cleaning solutions have long and highly successful track records.
Debris CatchingIn wellbore cleanout situations where sufficient annular velocity cannotbe obtained to carry debris out of the wellbore, foam systems or nitrifiedfluids can be used. A time- and cost-saving alternative is a debris catching system, which is used to remove various types of high-density debrisand formation particles too heavy to be circulated to surface.Baker Oil Tools SolutionsBaker’s Rotary Venturi Cleanout System consists of a Venturi Jet JunkBasket (VJJB) and Navi-Drill Workover Motor. Typically a VJJB is runalone but can be run with a motor to break up compacted debris that istoo heavy to circulate to surface. The jet basket uses the venturi principle to create a pressure drop inside the tool. Extension barrels can beinserted in the tool to increase its solids carrying capacity.MotorheadAssemblyKey features and advantages Fully closed finger or flutter catchers Can be run with any type of dressed shoe Adjustable reservoir through extensions Adjustable nozzles to accommodate various flow ratesNavi-DrillWorkover MotorVenturi Jet JunkBasketA Venturi Jet Junk Basket(VJJB) with a dressed shoecan be run in conjunctionwith a Navi-Drill WorkoverMotor to break upcompacted debris that is tooheavy to circulate to surface.4
UnderreamingProductionTubingIn well cleaning the most common underreaming task is removingcement left from coiled tubing squeeze cementing. Leftover cementis typically the result of large cement nodes forming at the squeezedperforations, or cement hardening before the excess can be reversed out.These cement restrictions must be removed before re perforating. Anunderreamer is also used to clean out scale and hard fill that cannot beremoved from liners by jet-washing tools. A mill could be used in theseconditions, but the resulting hole size would be about the same as theinternal drift of the tubing, leaving a sheath on the walls of the liner. Thissheath could dislodge during subsequent operations, possibly resultingin stuck tools. Perforating would not be as efficient because the chargeswould have to expend energy penetrating the sheath before reaching theliner.Coiled TubingConnectorLockableSwivelBaker Oil Tools SolutionsDual BackPressure ValveThe DB Underreamer has proven highly successful in removingcement, packed sand, resin-coated sand, formation and other forms ofobstructions. Unlike other slimhole underreamers, the DB Underreameris designed with a positive locking feature to ensure all cutting bladesmaintain a full extension upon activation and during an underreamingoperation.Thru-TubingDual ActuatedCirculating ValveA proprietary software program models flow and operational characteristics of the DB Underreamer prior to each job and during field operations.The program aids in determining appropriate orifice size to maximizethe efficiency of allowable hydraulic power.Non-RotatingStabilizerKey features and advantages Adjustable nozzles for all flow ports Pressure indication on surface when arms are fully extended Sturdy construction for downhole reliabilityNavi-Drill X-tremeWorkover Motor Designed to underream cased or open hole Positive locking of arms when activatedCase History North SeaObjective: Remove cement from a 7 in. 29.00 lb/ft liner whichwas left partly cemented to a total depth of 13,600 ft.Due to a 3.695 in. restriction in the completion, a conventional fullbore milling assemby could not be run.DB UnderreamerCT Solution: A 3 in. OD DB Underreamer with lower bit box wasused in combination with a 3.35 in. turbo mill. Thissystem was chosen because of the plug form of thecement.Result: The underreamer used in combination with the turbomill successfully milled 1,118 ft of cement in a singlerun. Using water and high viscous pills, an averagerate of penetration (ROP) of 74.50 ft/hr was achieved.CementCasingDB UnderreamerAssembly5Well CleaningAn underreamer is designed to pass through a downhole restriction,open, clean the hole to full gauge, and close for retrieval back throughthe restriction. The restriction is typically in the production tubing string,in the form of nipple profiles, mandrels, and other completionaccessories.
Impact DrillingDownhole conditions such as high temperatures (above 400 F) andhostile fluids can significantly reduce the life of a workover motor andlimit milling operations. Impact drill systems are an attractive alternativebecause they perform reliably in adverse conditions. The most commonapplications of the impact drill include scale milling, hard cement milling, resin sand removal, and gravel removal.MotorheadAssemblyBaker Oil Tools SolutionsBaker Oil Tools’ Single-DirectionalImpact Drill (Si-Di) is used todrill hard packed sand and cement,remove scale and drive debrisdownhole. The industry-leadingimpact drill can function as a standard impact hammer, or by applying a modular rotational feature, asa rotating impact drill. It has beenspecifically designed for use oncoiled tubing but can be used onthreaded pipe in conjunction withan accelerator. Fluid, gas, or foampower the tool, which can operatein temperatures over 600 F.Single-Directional Impact DrillKey features and advantages Does not operate until the bit meets resistanceHIPP-TRIPPERAccelerator Does not store reverse torque Can operate in high temperatures (above 600 F) Operates with most fluid media including high volumes of nitrogen Short make-up length Can be equipped to operate in hostile conditions Low redress costs (not constructed of elastomers)Case History North SeaObjective: Barium sulfate scale needed to be removed from a wellwhich had a restricted tool-string deployment heightof 11 ft. This ruled out using a conventional positivedisplacement motor and underreamer assembly.Weight BarSi-Di HIPP-TRIPPERImpact DrillCT Solution: A 2-5/8 in. OD Si-Di Impact Drill equipped with a CutButton Bit was deployed with a conventional motorhead assembly. Overall assembly length was 9 ft.Result: The assembly successfully drilled out approximately210 ft of barium sulfate scale at an average rate of61 ft/hour. The cleanout yielded a 96% increase in oilproduction in the 7 in. monobore completion.Cut Button BitA well cleaningbottomhole assemblyincorporating aSi-Di Impact Drill incombination with aCut Button Bit forscale removal or hardformation drilling.6
Mechanical Scale RemovalBaker Oil Tools SolutionsBaker’s METAL MUNCHER Turbo Scale Mill has provento be the most effective of all scale removal options.Baker Oil Tools’ METAL MUNCHER Turbo ScaleMill has proven to be the most effective of all optionsfor scale removal. A typical Baker Oil Tools scaleremoval bottomhole assembly (BHA) consists of aTurbo Scale Mill run below the industry-leading NaviDrill X-treme Workover Motor. The cutting matrixand layout of the Turbo Scale Mill face have beenoptimized for this setup. The mill has a smaller contactarea when milling, which reduces torque consumption. As a result, there are fewer motor stalls and rateof penetration (ROP) is increased. Stabilizer pads andbrass dressed on top of the METAL MUNCHER insertsminimize the risk of damaging the tubing or casingwall. The mill is dressed such that if the initial cuttingedge breaks due to vibration or hardness of the scale, asecond, lower, dressed layer will take over. This designhas lengthened mill life per run and reduced trips tosurface during extended mi
coiled-tubing-conveyed intervention products, services and solutions with which to approach individual well requirements. This handbook was developed to help our clients determine which systems and services will best meet the needs of a particular application. For that reason, we have designed the handbook to highlight system capabilities within
