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11 Cards in this Set
- Front
- Back
Main limitations with coiled tubing
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low flowrate
cannot rotate buckling |
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main functionality of tractor
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pull string into horizontal section of well
rotate tools/ cutters etc |
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typical operations with coiled tubing
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removing wax, hydrates etc
perforating fracturing sand removal zonal isolation run completion logging fishing setting plug presizely drilling cutting tubing place gravel pack |
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what is abrasive jetting
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It is an operation similar to sandblasting, use water at high velocity with small nozles in the coil tubing tool to cut casings etc
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how can data be sent from tool to other sites
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by electric wire from tool to platform
by optical cable from tool to platform by saving data in the tool and retrieving it when tool returns to platform Can use satellite to send information, from platform to platform or from platform to onshore site |
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what is the tornado concept in coiled tubing?
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It is when coiled tubing is used for sand removal, the nozzles mounted on the end of a rotating component. the result is that the nozzles makes a swirling effect and tornadoes the sand upwards.
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How can we perforate using coiled tubing?
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Perforation gun is mounted in the end of the tubing
the guns are lowered to desired depth and trigged by an electrical signal or pressure. After the explosion the guns can ether be dropped or retrieved to surface. (can also use abrasive peroration technique) |
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How is coiled tubing used for underballanced drilling?
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underballanced drilling are good for hole cleaning
since the coiled tubing cannot rotate, there is a need for a downhole rotary motor at the bottom of the string. There is also a need for a separator to seaparate the drilling fluid from the produced fluid. |
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how does a downhole motor work?
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The motor rotates when fluid passes
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What is a RSM
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It is a rib steerable motor
it is steered using ribs |
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What are the potential growth for coil tubing?
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Ct drilling
Fracturing flowline/prodction line scale removal deeper wells |