Drill bit performance evaluating method and system

Abstract

The invention discloses a drill bit performance evaluating method and system. The method and system are particularly suitable for steering drilling. Based on a virtual strength index principle, considering a steering drilling driving mode using a bottom power drilling tool, a drill bit rock breaking efficiency calculating method under the steering drilling mode is established, drilling bit rock breaking efficiency and footage are comprehensively balanced, the influences of drilling working conditions on the compatibility of a drill bit and a stratum are reduced to the maximum extent, and errors in drill bit performance evaluation in the prior art are corrected. By means of the scheme, the method and system have the advantages that two different driving modes including the oriented slide drilling mode and the dual-drive composite drilling mode are considered for drilling bit rotating speed, and the working characteristics of the drill bit can be more reasonably represented; under the steering drilling conditions, according to the different driving modes, virtual strength indexes are calculated for well segments in the footage of the single drill bit in a segmented mode, and the total virtual strength index calculation value in the footage of the single drill bit is more precise.

Description

technical field [0001] The invention relates to the technical fields of petroleum engineering and mining engineering, in particular to a method and system for evaluating the performance of a drill bit with a bottom dynamic drilling tool in steerable drilling. Background technique [0002] During the drilling process, the drill bit is a direct tool for breaking rocks to form a wellbore. The working performance of the drill bit directly affects the drilling cycle, drilling cost and drilling risk. Accurate bit performance evaluation is of great significance for predicting drilling speed, bit selection and analyzing drilling accidents. [0003] At present, mechanical specific energy or virtual strength index is often used to evaluate the working efficiency of drill bits at home and abroad. This method eliminates the interference of the rock-breaking efficiency of the drill bit by the change of the mechanical speed of penetration caused by the drill pressure, rotational speed an...

AI Technical Summary

Problems solved by technology

[0006] 1. When the bottom hole assembly drives the power drilling tool, there is a big gap between the dual-drive compound drilling method and the directional sliding drilling method in parameters such as pressure on bit and rotational speed. The original calculation method considers the inner well section of the bit footage as a whole, and the error is relatively large Big;

[0007] 2. The original evaluation method pays more attention to ROP, but it cannot accurately reflect its working performance when encountering "high speed and low efficiency", that is, drill bits with high ROP and low footage

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