Study on a New Cement for Deepwater Well Cementing

Abstract

In view of the new concerns in deepwater cementing, such as low temperature, shallow water/gas flow and so on, that can not be efficiently solved with conventional cement systems, a new SP-D cement with calcium sulphoaluminate and silicate was developed to adapt to deepwater low-temperature cementing. Test results show that the SP-D cement possesses high early-strength under low-temperature, favorable compatibility with conventional accelerators and retarders, and can be used to prepare the low density cement slurries combining with microsphere. The research offers a new SP-D cement for deepwater cementing with favorable high early-strength, improved migration control ability and minute expansion of set cement, and also shows prospective solution for the confronted problems in deepwater cementing.