Changes

[[File:Charles-l-vavra-john-g-kaldi-robert-m-sneider_capillary-pressure_4.jpg|thumb|left|'''Figure 4.''' Wellbore diagram of (a) a casing-tubing dual completion and (b) a completion with dual packers and dual tubing strings.]]

[[File:Charles-l-vavra-john-g-kaldi-robert-m-sneider_capillary-pressure_4.jpg|thumb|left|'''Figure 4.''' Wellbore diagram of (a) a casing-tubing dual completion and (b) a completion with dual packers and dual tubing strings.]]

In certain cases, multiple completions may provide the best control of reservoir operations. Multiple completions include the tubing-casing dual, dual tubing strings, and the typical triple completion consisting of three tubing strings. Figures [[:Image:Charles-l-vavra-john-g-kaldi-robert-m-sneider_capillary-pressure_4.jpg|4]] and [[:Image:Charles-l-vavra-john-g-kaldi-robert-m-sneider_capillary-pressure_5.jpg|5]] illustrate these multiple completions.

In certain cases, multiple completions may provide the best control of reservoir operations. Multiple completions include the [[tubing-casing dual]], [[dual tubing strings]], and the typical triple completion consisting of three tubing strings. Figures [[:Image:Charles-l-vavra-john-g-kaldi-robert-m-sneider_capillary-pressure_4.jpg|4]] and [[:Image:Charles-l-vavra-john-g-kaldi-robert-m-sneider_capillary-pressure_5.jpg|5]] illustrate these multiple completions.

[[File:Charles-l-vavra-john-g-kaldi-robert-m-sneider_capillary-pressure_5.jpg|thumb|'''Figure 5.''' Wellbore diagram of a conventional triple completion.]]

[[File:Charles-l-vavra-john-g-kaldi-robert-m-sneider_capillary-pressure_5.jpg|thumb|'''Figure 5.''' Wellbore diagram of a conventional triple completion.]]

The more complex the completion, the more trouble one can expect in both completion operations and in subsequent workover operations. Multiple completions should be considered only in special situations. These situations include areas where drilling costs are very high or where the area allocated for drilling wells is at a premium. Such areas include offshore areas, highly populated areas, and remote land locations.

The more complex the completion, the more trouble one can expect in both completion operations and in subsequent [[Workovers|workover operations]]. Multiple completions should be considered only in special situations. These situations include areas where [[drilling costs]] are very high or where the area allocated for drilling wells is at a premium. Such areas include offshore areas, highly populated areas, and remote land locations.

The main advantage of multiple completions is that two or more reservoirs can be simultaneously produced from a single wellbore. If all goes properly, the economics of using multiple completions can be attractive; however, operating and workover costs can be quite high. These operational factors must be considered when considering multiple completions.

The main advantage of multiple completions is that two or more reservoirs can be simultaneously produced from a single wellbore. If all goes properly, the economics of using multiple completions can be attractive; however, operating and workover costs can be quite high. These operational factors must be considered when considering multiple completions.