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Liner is basically a kind of casing the main difference b/w liner and ordinary casing is that , the ordinary casing extends from surface to particular depth but in case of liner it does not extend from surface to particular depth but it attaches with the last part of the above casing .For example if you have drilled TD of 15000 ft and you have to install a liner at the bottom and suppose the liner length is 200ft.All the other casings will be installed from surface to to its particular desire depth but liner will be installed at the bottom of the other casings .
Advantages
1.Economics: you save the cost of 14800 ft of steel or aluminum .
2.Reducing the pressure at the surface: If you install a liner having a length of 15000 ft it will produce a lot of pressure on the surface .
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∙ 11y ago
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What is difference between reaming and drilling?
Drilling is a cutting process in which drill is used to make a hole. Drilling process usually creates rough surfaces. Therefore, reaming is done after drilling to make a good surface finish, without changing the chemical and physical properties of the material. In reaming, only 5% of the material is removed (rest is removed by drilling process done before).
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