Inflow Control Devices (ICDs) are used as a permanent part of the well completion to control and to effectively equalize the inflow from the reservoir to the wellbore along the length of horizontal section. Key consideration in ICD optimization are good reservoir modeling using in-house and commercially available Petroleum Engineering software, complete geological data from the existing wells and accurate permeability profiles (minimum and maximum permeability values and well test analysis).
Successful design and implementation of ICDs in horizontal sections depends on identifying and evaluating the correct Key Parameter Indicators sets (KPI's). The optimum ICD selection and placement is achieved by evaluating both non-ICD completion as a basic scenario and, a set of scenarios with varying pressure drop through the identified isolated zones along the horizontal wellbore (compartmentalization). Selection is governed by the appropriate ICDs selection and Flow Restriction Ratings (FRR) setting.
The ultimate goal is to the maximize the recovery factor by generating a uniform flow pattern through the drainage area in long horizontal wellbores, despite the differences in the frictional pressure drop from toe to heel, which is of major concern regarding water and gas coning.
In addition to a good understanding of both reservoir behavior and sand control completion technology, the process under discussion will help to overcome the geological challenges and to maximize the production.