Well drilling analysis method

Abstract

The invention discloses a well drilling analysis method. The well drilling analysis method comprises the steps that S100, establishing a finite element model based on drilling speed-drilling tooth-stratum drilling simulation; S200, solving and analyzing the finite element model by adopting a display integral algorithm to obtain bit pressure and torque borne by the drill teeth at the correspondingrock breaking speed; and S300, giving the rock breaking speed matched with the drilling tool combination used in the drilling site or the drilling tool combination matched with the rock breaking speedexpected to be achieved in the drilling site according to the bit pressure and torque borne by the drilling teeth at the corresponding rock breaking speed. According to the drilling analysis method,the bit pressure and the torque required for reaching a certain mechanical drilling speed drill tooth are directly studied; the real-time drilling rock breaking process in the drilling engineering canbe more truly simulated, the on-site actual drilling working condition can be more accurately reflected, then a more reasonable calculation result is obtained, a reference can be provided for drilling acceleration evaluation, and a reference basis is provided for solving the problems of drilling design, drilling tool combination optimization, drilling parameter optimization and the like in the on-site actual drilling engineering.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploration and development, in particular to a drilling analysis method. Background technique [0002] In the process of oil and gas and coal exploration and development, drilling costs account for 50% to 80% of the total exploration and development costs. Seriously, the occurrence of downhole accidents and low ROP have become the key factors that increase drilling costs. How to reduce the probability of downhole accidents and increase the ROP of drilling to reduce drilling costs has always been a technical problem that field engineers want to solve urgently. Therefore, the study of the rock breaking law of the drill bit has always been a hot research topic. According to the actual drilling data on site, the use of reasonable drilling design, reasonable drilling tool combination, appropriate drilling parameters and suitable drilling tools can greatly increase the ROP of drilling, shorten the...

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Problems solved by technology

[0003] The existing analysis and research method on drilling is to study the interaction between the drill tooth and the formation, often by establishing the mechanical model of the drill tooth and rock, and the research focus is on the threshold WOB and threshold torque. The research method cannot obtain the real WOB and torque required for the rapid rock breaking of the drill teeth under the consideration of the cumulative damage of the rock, resulting in the inability to give a reasonable drilling tool combination, appropriate drilling parameters and suitable drilling tools

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