Petroleum Chemistry

Drilling & Well Completions Challenges

Well completion is the process of making a well prepared for production (or injection). This primarily includes setting up the bottom of the hole to the required specifications, running in the production tubing and its related down hole tools as well as perforating and stimulating as required. In some cases the process of running in and cementing the casing is also included. After a well has been penetrated, should the drilling fluids be evacuated, the well would eventually close in upon itself. Casing ensures that this will not happen while also protecting the wellstream from outside incumbents, like water or sand.

This refers to the portion of the well over the creation or injection zone. The well designer has numerous devices and options available to design the lower completion according to the conditions of the reservoir. Regularly, the lower completion is set across the productive zone using a liner hanger system, which anchors the lower completion to the production casing string. The broad categories of lower completion are listed below.