Choosing Optimal Standoff for Horizontal Well Profile with High Cavernosity to Achieve Better Mud Removal

Abstract

Cement bond logs in the Messoyakha field indicated only 65% achieved mud displacement, which resulted in poor zonal isolation, resulting in annular pressure and remediation. Casing standoff is the most important factor to achieving better mud displacement from the annular space. The wellbore profile and the presence of caverns have significant impact on casing standoff. At the same time, increased centralization, in some cases, has a critical impact on running the casing to planned depth. Analysis in the use of different types of centralizers, their spacing patterns, and placement on the casing in the horizontal wells in this field are detailed in addition to the results of trial operations.