Effect of rheological property of slurry on cementing displacement interface of horizontal well: the numerical simulation based on large-scale cluster computing platform Tianhe-1

Cementing displacement effect of horizontal cementing section is the key to cementing quality of horizontal wells.And the centralized degree of casing and the rheological property of slurry are important parameters impacting cementing displacement effect of horizontal section.In this paper, the cementing displacement in the eccentric annulus of horizontal section (300 m long) was numerically simulated for 1 000 s by using Fluent software on the large-scale cluster computing platform Tianhe-1 of National Supercomputing Center, to investigate the influential laws of rheological property of slurry on cementing displacement interface.It is indicated that the effect of slurry flow index (n) on displacement is negligible when the centralized degree is low (≤50.0%).When the centralized degree is moderate (50.0% < centralized degree < 85.0%), the retention of spacer fluid at the wide (narrow) side can be improved significantlyby increasing (decreasing) slurry n, so it is necessary to take slurry n into consideration comprehensively during the design.In the case of high centralized degree (85.0%≤centralized degree < 100%) and ideal centralized degree (100%), it is necessary to prevent slurry n from being too low during the design, so as to avoid slurry from stratified channeling in annulus.The research results can be used as the instruction for the design of cementing displacement operation.