Coiled Tubing Full Information – Drilling Handbook

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Coiled Tubing (CT) is a steady size of small-diameter pipe that’s spooled onto a reel in the identical method as wire or cable is wrapped on a drum. The coiled tubing operation permits the strategy of “snubbing” a steady size of tubing out and in of a stay nicely by a stripper BOP association. The primary benefit of Coiled Tubing is that it may be run into producing wells, in opposition to excessive wellhead pressures (e.g. 345 bar / 34,500 kPa or 5000 psi), and down previous the perforations, with out manufacturing interruption or killing the nicely (Wait and WeightDriller’s Technique). The most typical pipe dimension in use is 1.5″ by to 2.875″, though bigger sizes can be found and used.

Test additionally Coiled Tubing Handbook PDF obtain

In an offshore atmosphere, Coiled Tubing will be run right into a nicely as shortly as 3 hours, after positioning the tools on deck. When truck mounted for land operations, this time will be lower to 1.5 hours after rig up on website. With the addition of a most working depth of 7700m (25,000 ft), which will be achieved at operating speeds of 79m/minute (260 ft/minute), it may be seen that Coiled Tubing is a really cost-effective method of performing downhole work.

Determine 1:          Fundamental Coiled Tubing Parts (land unit)

The usual coiled tubing bundle will be outlined when it comes to the floor tools wanted to soundly journey the coiled tubing out and in of the nicely:

Figure 2:          Coiled Tubing Rig Up, Land Well
Determine 2:          Coiled Tubing Rig Up, Land Nicely
Figure 3:          Examples of Offshore CT Rig Ups (in drilling derrick and offshore platform)
Determine 3:          Examples of Offshore CT Rig Ups (in drilling derrick and offshore platform)

Auxiliary Coiled Tubing tools is required to make sure that the tubing is run to the required depth and that the working envelope (strain, weight, and so forth.) of the tools isn’t exceeded all through the period of the duty. Extra tools related to the duty kind can also be required, similar to nitrogen tanks for nitrogen displacement, or downhole instruments, similar to a mill and motor for milling in drilling operations, a downhole mud motor for coiled tubing drilling.

This Matter supplies an summary of the accessible floor tools, nevertheless as know-how develops, the vary of instruments could also be enhanced for many functions.

A variety of coiled tubing packages/models is obtainable from the service corporations. The choice of this tools is predominantly decided by the supposed software and nicely completion circumstances, i.e. bitter service, CT dimension, and so forth. Moreover, hybrid models can be found which allow the retrieval of standard tubular, or different nicely preparation duties requiring standard operations, previous to commencing the coiled tubing work. These hybrids have been developed predominantly in response to nicely re-entry necessities and coiled tubing drilling.

The total suite of floor tools used throughout coiled tubing operations will fluctuate relying on the job to be carried out.

Nonetheless, the next principal objects of apparatus are thought of to be commonplace:

  • Main Tools
    • CT Reel Unit
    • Injector Head (together with “gooseneck”)
    • Energy Pack
    • Management Cabin (e.g. load / depth indicators)
  • Stress / Nicely Management Tools (test additionally: Nicely Management)
    • Stuffing Field
    • Quad Blowout Preventers (BOP)
    • Shear Seal BOP
    • Annular BOP (elective)

Functions

Coiled tubing is utilized in lengthy, horizontal wells, or as a substitute of cable if drilling or completion fluid is to be circulated within the nicely. Coiled tubing can be utilized for each nicely workover and nicely drilling.

Its benefit in comparison with cable operations (Wireline) is that it’s doable to flow into fluid into the nicely. The coiled tubing additionally has better power than cable and might carry the load of longer and heavier software string. It may also be utilized in wells which have an extended, horizontal, and sophisticated nicely trajectory (test nicely trajectory calculations).

Its functions on Workover Wells:

  • Acid stimulation of limestone formations,
  • Upkeep and washing of the wellbore
  • Perforation
  • Begin-up of the nicely with gentle liquid
  • Set up of completion tools
  • Gravel packing
  • Fishing in drilling operations

A number of drilling operations have additionally been carried out with CT as a piece string, however drilling operations with it aren’t frequent in some locations. 

The Coiled Tubing

Coiled tubing describes an extended tube that’s rolled right into a reel. The pipe is product of a metal alloy which makes the fabric versatile and on the similar time robust.

The tube is product of plates which might be rolled right into a cylindrical form. The open cylinder proceeds to a welding association that welds the ends of the plate collectively alongside the size of the pipe. It’s all produced as one lengthy tube which is fed onto a storage drum.

Production of coiled tubing
Determine 4: Manufacturing of coiled tubing

It may be bent across the drum core with out breaking or collapsing, however the pipe is completely deformed by the curve to which it’s bent. When the tube is pulled off the drum, it’s barely curved because of the bending it’s subjected to on the drum.

Working In Gap

The tube is pulled off the drum by CT injector mounted on prime of the nicely. The injector pulls the tube off the drum, whereas a small motor mounted on the core of the drum holds the counter (brake) in order that the drum doesn’t spin the whole size of the tube out freely ( runaway tubing ).

When the pipe passes by the injector, it’s straightened barely earlier than getting into the nicely. When the CT is pulled out of the nicely, the operator modifications the route of journey on the injector, in order that it pulls the pipe out of the nicely. On the similar time, the drum rolls by the use of the motor, in order that the pipe is rolled properly on the drum.

The Boundaries

When CT is to be run into the nicely, a coiled tubing BOP and two strippers are related on the prime of the nicely. They act as exterior obstacles. As well as, two one-way valves are mounted within the backside of the coiled tubing, in order that there isn’t any outflow from the nicely by it to the floor.

Coiled tubing in comparison with wireline and drilling

Coiled tubing Drill pipes Cable
avoids stopping whereas pipe tripping RIH & POOH to attach pipes collectively or aside ( connection ) should cease and make connections for every stand quicker RIH/POOH than each coiled tubing and drill pipe
permits fluids circulation permit fluids circulation circulation isn’t doable
long-range and thrust long-range and thrust long-range however small thrust
good traction greatest traction small traction
can be utilized for drilling is greatest suited to drilling cannot drill
cannot rotate the tube however Backside Gap Meeting can rotate each tubes and any forms of the Backside Gap Meeting cannot rotate cable or instruments
versatile, can go in spiral lock within the nicely stiff and steady with out structural rigidity, should be stored in rigidity to keep away from cable knot
withstands some gap friction excellent in opposition to gap friction doesn’t tolerate gap friction
The pipe is weakened by bending masses from the drum, the gooseneck and the injector. It should be lower after a while. The pipes have a really lengthy period. They are often lower, a brand new thread field will be fitted, and they are often reused. The cable has a superb security margin for the load. It’s lower/changed when it achieves a life limitation.

Coiled Tubing Capacities

Dimension OD in Wt/Ft Ib ID in Bbl / Lin Ft Lin Ft/Bbl Cu Ft/Lin Ft Lin Ft/ Cu Ft Gal/ Lin Ft Lin Ft/ Gal
 1 .743  .850 .00070 1424.8 .00394 253.77 .0295 33.924
  .850 .826 .00066 1508.8 .00372 268.73 .0278 35.924
.920  .810 .00064 1569.0 .00358 279.45 .0268 37.357
  .981  .796 .00062 1624.6 .00346 289.37 .0259 38.683
  1.040  .782 .00059 1683.3 .00334 299.82 .0250 40.080
1 1/4  .944 1.100 .00118   850.7 .00660 151.53 .0494 20.256
  1.083 1.076 .00112   889.1 .00631 158.36 .0472 21.170
  1.175 1.060 .00109   916.2 .00613 163.18 .0458 21.814
  1.254 1.046 .00106   940.9 .00597 167.58 .0446 22.402
1.332 1.032 .00103   966.6 .00581 172.16 .0435 23.014
  1.506 1.000 .00097 1029.4 .00545 183.35 .0408 24.510
  1.601  .982 .00094 1067.5 .00526 190.13 .0393 25.417
  1.827 .938 .00085 1170.0 .00480 208.39 .0359 27.857
  2.014  .900 .00079 1270.9 .00442 226.36 .0330 30.259
 1 1/2 1.429 1.310 .00167   599.8 .00936 106.84 .0700 14.282
  1.527 1.296 .00163   612.9 .00916 109.16 .0685 14.593
  1.623 1.282 .00160   626.3 .00896 111.56 .0671 14.913
1.840 1.250 .00152   658.8 .00852 117.34 .0638 15.686
  1.960 1.232 .00147   678.2 .00828 120.80 .0619 16.148
  2.245 1.188 .00137   729.4 .00770 129.91 .0576 17.366
  2.483 1.150 .00128   778.4 .00721 138.64 .0540 18.533
 1 3/4 1.915 1.532 .00228   438.6 .01280   78.12 .0958 10.443
  2.175 1.500 .00219   457.5 .01227   81.49 .0918 10.893
2.318 1.482 .00213   468.7 .01198   83.48 .0896 11.160
  2.662 1.438 .00201   497.8 .01128   88.67 .0844 11.853
  2.951 1.400 .00190   525.2 .01069   93.55 .0800 12.505
 2 2.207 1.783 .00309   323.8 .01734   57.67 .1297   7.710
  2.509 1.750 .00297   336.1 .01670   59.87 .1250   8.003
2.677 1.732 .00291   343.2 .01636   61.12 .1224   8.170
  3.080 1.688 .00277   361.3 .01554   64.35 .1163   8.602
  3.419 1.650 .00264   378.1 .01485   67.35 .1111   9.003
 2 3/8 3.011 2.125 .00439   228.0 .02463   40.60 .1842   5.428
  3.215 2.107 .00431   231.9 .02421   41.30 .1811   5.521
3.706 2.063 .00413   241.9 .02321   43.08 .1736   5.759
  4.122 2.025 .00398   251.0 .02236   44.71 .1673   5.977
  4.445 1.995 .00387   258.6 .02171   46.07 .1624   6.158
 2 7/8 3.932 2.607 .00660   151.5 .03707   26.98 .2773   3.606
4.554 2.563 .00638   156.7 .03583   27.91 .2680   3.731
  5.059 2.525 .00619   161.5 .03477   28.76 .2601   3.844
  5.462 2.495 .00605   165.4 .03395   29.45 .2540   3.937
3 1/2 6.230 3.150 .00964   103.7 .05412   18.48 .4048   2.470
  6.733 3.120 .00946   105.7 .05309   18.84 .3972   2.518

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