Well, Completion is a method in which a well is prepared for the production by installing the necessary equipment into it, to offer a safer and controlled flow of HCS at the surface. It’s that time when engineers decide whether to install the production or should left it abandoned as a dry hole. Well, completion incorporates steps ( cementing, perforating, gravel packing and installing a production tree) to transform a drilled well to the producing one.

Some of the common purposes of well completions are:

  • It connects the reservoir to the surface so that the fluids can be injected into the reservoir
  • It offers a conduit for other well stimulation treatments
  • Offer a pipe to measure the changes in the flow rate and pressure which  are required to run a well test

Steps involved in well completion work:

Casing:

Featuring a steel pipe, which is joined together to make a continuous hollow tube, a casing is defined as a run into the well. Different well has different diameters of casing’s installed. Once the wireline service engineers drill the well, the drilling fluid is removed so that the well will not close itself. Further, the casing will protect the well stream from the things like water and sand.

Cementing:

After casing, cementing completes the well. Cementing includes filling cement slurry into the well to showcase the existing drilling fluids and to fill the vacant spaces between the casing and the actual side of the well.

Open Hole Completion:

This type of completion was used by petroleum industries when the wells were drilled by using cable tools. When the formation gets penetrated, and the oils and gas start flowing, the drilling ceased and the well produced at that time is called an open hole completion. Although this type of completion is not common, it is still used in different situations and locations. However, one major disadvantage of a casing is that it is set before the drilling and logging. Also, open-hole completion includes the uncontrolled flow of fluids from the reservoir into the wellbore.

Liner Completions:

These are similar to open hole completion, in which the casing is set before drilling. However, the major advantage of a liner completion is that the drilling rig of a fluid system can be changed to a nondamaging fluid, which is used to drill the pay interval. Different types of liner completions are:

Slotted Liner: It is similar to an open hole completion; just the slotted line is hung in the open hole interval to minimize the sloughing formation into the wellbore.

Screen And Liner: It’s a set in the open hole section of the wellbore with the gravel placed behind the screen.

Cemented Liner: It is used when the intermediate casing is set in a well before reaching to its exact depth.

Perforation:

Perforations help in enhancing the effective flow of communication between the wellbore and the reservoir. To create a perforation, a gun is used to shoot a hole in the cement or casing.

Well, completions play an important role in determining the economics of a well!

Published by Janice Cook