Analyzing Effects of Horizontal Casing Centralizers

Photo of Rahul Jain, Steven Kanik, Sami Sultan, & Maria Sylte Students: Rahul Jain, Steven Kanik, Sami Sultan, & Maria Sylte

Sponsor: Shell Global Solutions

Date: Spring 2013

Requirements:
Shell provided data from 20 wells that the company recently drilled: 10 with centralizers and 10 without centralizers. The data given included production casing tallies, daily rig reports, directional end of well reports, and data from MyWells, a real-time data acquisition program. The team also obtained cost estimates from the company sponsor. Te only significant constraints were the small sample size, limited access to well-modeling software, and many uncontrolled variables that could adversely affect the analysis.

Problem:
The project focuses on the effects of centralizers on casing installation time and costs. Although it is common industry practice to use centralizers, Shell's partner in North Louisiana does not use centralizers and claims to have equally successful completions and production results while minimizing casing installation time. This analysis provides a formal study of these competing approaches.

Solution:
After analyzing trends for installation time and speed for all aspects of casing installation, the team concluded that centralizers increase casing installation time. In designing new wells that do not use centralizers, Shell can save an average of $18,800 per well (15% of total casing installation cost). The team recommends Shell conduct further investigation on the effects of omission of centralizers with respect to long-term production of a well.

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