Definition - What does Openhole Completion mean?
Openhole Completion is a well completion with no cementing or any well casing or liner across the production zone. When a well is completely ready for production of oil and gas or any injection activities, it is known as well completion. Openhole Completion facilitates the fluids flow directly into the wellbore. Openhole Completion comes under the category of lower completion, which is the area of well around the production zone.
Petropedia explains Openhole Completion
Openhole Completion is popular in horizontal wells as it is technically very difficult and economically expensive to cement the horizontal wells. Instead of cementing such type of wells, they are left in a state of Openhole completion as it is much more economical. The following are the advantages Openhole Completion:
- The formation damage is minimized.
- Perforation is not required.
- It is easy to convert in liner mode.
The main disadvantage of keeping wells in an Openhole Completion state is that the sandface has no support and there is a risk of collapsing. Moreover, it is difficult to control water/gas and carry out selective treatments within the wellbore and reservoir when the casing is not installed.