No abstract

No abstract

This paper was prepared for presentation at the 1999 SPE Annual Technical Conference and Exhibition held in Houston, Texas, 3–6 October 1999.

This paper describes new research into cement placement. The research used a novel large-scale flow loop with 49 ft [15 m] of 8V2-in. [21.6-cm] open hole thatcan be deviated from a to 90 0 . A distinction is made between mud displacement and cement placement and some of the problems associated with each process are described. Examples are given from the largescale flow loop. Other work that used a flow-visualization loop and mathematical modeling is also discussed.Preliminary conclusions confirm the long-held intuitive view that correct casing centralization, circulation rate, and mud properties are critical for mud displacement. The paper also presents a technique to quantify the role of each variable. Efficient cement placement is influenced by spacer properties and centralization.

No abstract