DOUBLE-STAGE THREE-SECTIONAL CEMENTING TECHNIQUE IN WELL SHANKE-1

Well Shanke-1 is a scientific exploration well, and its intermediate completion depth is 4646m.During drilling of the third section, such troubles as hole collapse, wall slabbing, lost circulation and oil gas activities occurred, especially the problem of annular return lost after casing running, caused great difficulties for cementing operations.By programming a suitable plugging plan, applying the double-stage three-sectional cementing technique, and optimizing three types of cement slurry formulations and their performances as well, well circulation was established once more.The first stage bottomhole section applied conventional cement job, and the upper second stage applied conventional cement job first, and then the reverse cement job.Logging results showed that the cementing quality met the designed requirements, and set the foundation for safe drilling of the fourth section.