Abstract
Summary The rheological properties of cement slurries usually vary greatly with the change of temperature. This not only increases the complexity of the cementing-job design, but also has side effects on cementing quality. To resolve this problem, a cement slurry with temperature-insensitive viscosity has been prepared by adding a type of thermosensitive viscosity controller (TVC). The experiments show that the cement slurry has relatively temperature-stable rheological properties and shows very little thermal thinning between 20 and 120°C. In addition, the thermally-stable-viscosity cement slurry has good stability and a performance that can meet the demands of well cementing. The cement slurry improves displacement efficiency and cementing design. It has been used successfully in the oil field, and the results show that the cementing-job quality is acceptable.
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