Abstract
ABSTRACT Operators in the Gulf of Bohai have practically eliminated remedial squeeze cementing requirements by using encapsulated air as a lightweight cement additive. Air entrapped in hollow beads composed mostly of silicon and aluminum is added to the slurry to allow for mixtures lighter than water, but with necessary strength to provide good primary cement jobs. Cementing in the Gulf of Bohai is made difficult by bottom-hole static temperatures (BHST) of 275–320°F (135–160°C). Specific gravity of the mud is 1.1 to 1.3. Most wells have three to eight productive zones, making good isolation between zones critical to drillstem testing and future production work. Use of high-strength microspheres (HSMS) as a cement additive has improved primary casing and liner cementing to the point that remedial squeeze cementing in the Gulf of Bohai is now a rarity.
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