Cnpc Engineering Technology R&d Company Limited

Haige Wang

Qiang Wu

Li Liu

Jing Yu

Liu Cui

Meng Cui

Zhao Meng

Guodong Ji

Jiawei Zhang

Changchang Chen

A method for evaluating a downhole working condition of a PDC bit includes: performing an indoor test, including performing a drilling test in different full-sized cores by using the PDC bit with different degrees of abrasion and balling under condition of given WOB and rotational speed, to acquire change characteristics of a WOB, a rotational speed, a torque, a ROP and a bit vibration of the PDC bit in different time domains; improving and perfecting an existing prediction model and evaluation method for the downhole working condition through data obtained by the test to obtain the method; reading parameters of the WOB, the rotational speed, the torque and the ROP in real time during drilling; determining the downhole working condition of the PDC bit by using the method in the improving and perfecting.

Method for evaluating downhole working condition of a PDC bit

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Beijing, China

Haige Wang