DEVELOPMENT AND APPLICATION OF REAMING WHILE DRILLING TOOLS

The technology of reaming while drilling is a new drilling technology raised in recent years. The principle is reaming while drilling under the casing by the reamer, ultimately, the hole size is bigger than the bit size, which improves the well completion quality and solve the complicated accidents. Drilling technology research institute of Shengli Oilfield has developed the model JK215-237 underreamer. The structure and characteristics of the underreamer is introduced, and the condition of filed test in Kun628 well is described. The test results indicate that the structure of the model JK215-237 underreamer is reasonable, and it can realize the reaming while drilling under casing and improve the well completion quality. The development and application of this reamer has an important significance to the technology of reaming while drilling and the development of the reamer while drilling.