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Line 46: − − [[file:well-completions_fig2.png|thumb|{{figure number|2}}Wellbore diagram of (a) a screen and liner completion and (b) a cement liner completion.]]
→Liner completions
===Liner completions===
===Liner completions===
[[file:well-completions_fig2.png|thumb|300px|{{figure number|2}}Wellbore diagram of (a) a screen and liner completion and (b) a cement liner completion.]]
Liner completions are similar to open hole completions in that casing must be set prior to drilling the producing interval. The advantage of a liner completion is that the [[drilling fluid]] system can be changed and a nondamaging fluid used to drill the pay interval. Several types of liner completions are commonly employed in well completions. These include
Liner completions are similar to open hole completions in that casing must be set prior to drilling the producing interval. The advantage of a liner completion is that the [[drilling fluid]] system can be changed and a nondamaging fluid used to drill the pay interval. Several types of liner completions are commonly employed in well completions. These include
* Screen and liner
* Screen and liner
* Cemented liner
* Cemented liner
The slotted liner completion is similar to an open hole completion and has all the major advantages and disadvantages discussed for open hole completions. The only difference is that a slotted liner is hung in the open hole interval to minimize sloughing of the formation into the well bore ([[:file:well-completions_fig1.png|Figure 1b]]). A screen and liner completion is similar to the slotted liner completion in that a screen and liner is set in the open hole section of the wellbore. The difference is that gravel is sometimes placed behind the screen ([[:file:well-completions_fig2.png|Figure 2a]]). The advantages and disadvantages are the same as for open hole completions. The screen and liner completion is used primarily in unconsolidated formations to prevent the movement of formation materials into the wellbore, restricting the flow of reservoir fluids.
The slotted liner completion is similar to an open hole completion and has all the major advantages and disadvantages discussed for open hole completions. The only difference is that a slotted liner is hung in the open hole interval to minimize sloughing of the formation into the well bore ([[:file:well-completions_fig1.png|Figure 1b]]). A screen and liner completion is similar to the slotted liner completion in that a screen and liner is set in the open hole section of the wellbore. The difference is that gravel is sometimes placed behind the screen ([[:file:well-completions_fig2.png|Figure 2a]]). The advantages and disadvantages are the same as for open hole completions. The screen and liner completion is used primarily in unconsolidated formations to prevent the movement of formation materials into the wellbore, restricting the flow of reservoir fluids.