Slag/mud mixtures improve cementing operations in China

Dahua Wu, Peiyan, Bozong Huang Chinese National Petroleum Corp. Tanggu, China The use of blast furnace slag, which is inexpensive and widely available throughout China, can with proper activators and retarders, solidify mud into an excellent cementing material. In many cases, the slag/mud slurry outperforms conventional Portland cements in oil and gas wells. Mud conversion to cement technology has been studied for half a century and has attracted the attention of the drilling and cementing industry worldwide, because of its economic, technical, and environmental benefits.1-3 Particularly since slag-mix technology was developed by Shell Oil Co. in 1991, it has been successfu...

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