Application of Primary Cementing Principles, Rocky Mountains and Texas

Abstract

ABSTRACT A review of 23 primary cementing jobs performed over an 11-year period in four states has shown that success is improved When attention is directed to low-cost means of improving displacement of drilling muds by cement slurries. The most important factors appear to be placement of centralizers and scratches, conditioning of the drilling mud, and pipe movement (reciprocation) while conditioning mud and while placing cement. Confidence gained in the use of these methods has resulted in a job technique wherein the top cementing plug is pumped down with 10% acetic acid or other desired perforating fluid followed by 2% KCl water. This technique permits lower cost completions. The theory and application of cement bond logging are reviewed. Five example CBL-VDL logs are presented and discussed. Several examples are shown under applied surface pressure conditions. An example of a CBL-VDL log of an offset well where the principles of primary cementing were not observed is shown for comparison.