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Well intervention

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Coiled tubing

Veröffentlicht in: Ingenieurwesen
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Well intervention

  1. 1. Well intervention Under supervision of prof Ahmed elgebally 1
  2. 2. Fill materials Fill material Unhappy client Unhappy you 2
  3. 3. Cleanout The removal of wellbore-fill material such as sand , scale or organic materials , and other debris from the wellbore . Many reservoirs produce some sand or fines that may not be carried to surface in the produced fluid . Accumulation of fill material may eventually increase in concentration within the lower wellbore possibly restricting production . 3
  4. 4. Junk 4
  5. 5. Mill Before defining mill , we need to know what is junk ! . Junk is anything in wellbore that is not supposed to be there . The term is usually reserved for small pieces of steel such as hand tools , small parts , bit nozzles , pieces of bits or another down-hole tools. A mill is usually used to remove junk in the hole or to grind away all or parts of casing string . 5
  6. 6. In the case of junk , the metal must be broken into smaller pieces to facilitate removal from the wellbore so that drilling can continue . When milling casing , the intent is to cut a window through the side of the casing or to remove a continuous section of the casing so that the wellbore may be deviated from the original well through the window or section removed depending on the type of grinding or metal removal required . The shape of the cutting structures of mills varies .virtually all mills, however utilizes tungsten carbine cutting surfaces. 6
  7. 7. So , It’s time to talk about something allows fill material cleanout , mill and other very important uses . Coiled Tubing - Definition -main component -uses & advantages -Disadvantages 7
  8. 8. Definition Coiled tubing refers to a continuous length of small diameter steel pipe and related surface equipment as well as associated drilling , completion and work over or remediation , techniques . Coiled tubing oilfield technology was initially developed for working on live , producing wells . More recently , this technology has gained wider acceptance . The trend toward extended reach wells favors coiled tubing for its ability to drill or convey tools and equipment in high angle wellbores . 8
  9. 9. Main component 1.Injector and tubing guide arch 2.Service reel with CT 3.Power supply / Prime mover 4.Control console 5.Control and monitoring equipment 6.Downhole CT connectors and bottom-hole assembly(BHA) 7.Well-control stack equipment 9
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  11. 11. Power pack unit Provides hydraulic power to control and operate a coiled tubing unit and pressure control equipment “ has independent electric or diesel power source” 11
  12. 12. Control unit Control unit is located behind a coiled tubing reel “ or any location that is safe when operating the unit “ . Level of control and instrumentation depend on the type of operation being performed . 12
  13. 13. Injector head Consists of several hydraulic systems that allow a coiled tubing unit to operate with a high degree of operational variability . Its function “ Pulling and pushing “ . 13
  14. 14. Coiled tubing reel Main function; store a coiled tubing . It’s hydraulically driven . A reel driven system is designed to keep the coiled tubing in a dynamic tension between gooseneck and the reel . Its capacity depends on tubing size , weight and length of coiled tubing14
  15. 15. CT BOP The BOP is used to secure the coiled tubing and isolate the wellbore pressure during normal and emergency situations . Consists of Blind ram , Shear ram , Slip ram and pipe ram 15
  16. 16. Functions or uses Innovative services conveyed on CT are designed to improve your well and reservoir performance . Applications Matrix and fracture stimulation Wellbore cleanout Logging Perforating Nitrogen kickoff Sand control Drilling ‘’highly deviated and horizontal wells’’ Cementing Well circulation Mechanical isolation 16
  17. 17. Distributed temperature sensing 17
  18. 18. DTS Surveys to guide fluid placement and identify zones for acid stimulation . With selective diversion stages temporarily sealing off treated zones to ensure effective stimulation of all targeted intervals . 18
  19. 19. Fluid conveyance Nitrogen kickoff Fill removal Cement placement “ reduction of slurry contamination” Stimulation “ improving permeability “ 19
  20. 20. Nitrogen kickoff The most popular use for coiled tubing is circulation or deliquification . A hydrostatic head may be restricting flow of formation fluids due to its weight “ well is said to be killed “ . The safest , not cheapest , solution would be to attempt to circulate out the fluid using a gas “frequently nitrogen” often called Nitrogen kickoff and allow cleaning the hole . 20
  21. 21. Tool conveyance Coiled tubing fishing and milling Down-hole valve manipulation Blasting service Zonal isolation CT logging CT drilling Control flow from various zones Real time data Acid wash, scale removal Separation of zones via packer Enable horizontal drilling 21
  22. 22. Coiled tubing drilling A relatively modern drilling techniques involves using coiled tubing instead of conventional drill pipe . This has the advantage of requiring less effort to trip in and out of the well “ the coil can simply be run in and pulled out while drill pipe must be assembled and dismantled joint by joint while tripping in and out” 22
  23. 23. Instead of rotating the drill bit by using a rotary table or top drive at the surface . It’s turned by a down-hole Mud motor , powered by the motion of drilling fluid pumped from surface . Drilling which is powered by mud motor instead of rotating pipe is called slide drilling . 23
  24. 24. Coiled tubing logging Coiled tubing allow directional surveys , gamma ray , pressure and temperature measurements. 24
  25. 25. Coiled tubing production Coiled tubing is often used as production string in shallow gas wells that produce some water . The narrow internal diameter results in a much higher velocity than would occur inside conventional tubing or inside casing . This higher velocity assists in lifting liquids to surface . 25
  26. 26. DisadvantagesAdvantages Fatigue life limitNo rig required Pressure and tensionNo connections – fast Diameter and ovalityMoney saving More tortuous pathPumping flexibility fluid placement Reduced formation damage Allow MPD & UBD 26
  27. 27. Coiled Tubing 27
  28. 28. Thank you Presented by Mohammed Bahaa Mohammed Esmail 28