Well drilling simulation method based on well wall-drill string-drilling tool-drill bit-rock system

Abstract

The invention discloses a well drilling simulation method based on a well wall-drill string-drilling tool-drill bit-rock system. The invention belongs to the field of petroleum-natural gas explorationand development. The invention discloses a well drilling simulation method based on a well wall-drill string-drilling tool-drill bit-rock system, and aims to provide a reference basis for well drilling acceleration evaluation on site. According to the method, the method is characterized in that a finite element model based on a well wall-drill string-drilling tool-drill bit-rock system is established, and the method comprises the following specific steps that S1, establishing a finite element simulation grid model comprising a well wall, a drill rod, a drilling tool, a drill bit and rock; S2,testing different well pressures and different stresses of different sampled rocks by using a data acquisition system, and acquiring data for finite element model calculation; and S3, establishing arandom contact collision model of the drilling tool and the well wall and an interaction model between the drill bit and the rock. Sampled rock is experimented through the data acquisition system, acquired data is more real and reliable, and the method can be implemented in practical application.

Description

technical field [0001] The invention relates to the field of oil and gas exploration and development, in particular to a drilling simulation method based on a well wall-drill string-drill tool-drill bit-rock system. 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 drilling ROP to reduce drilling costs has always been a difficult problem that field engineers want to solve urgently. Therefore, the research on drill string mechanics and drilling rules has always been a hot research topic. [0003] According to the actual drilling data on site, the use of reasonable drilling design, reasonable drilling tool assembly, appropriate drilling parameters and suitable dril...

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Problems solved by technology

[0004] However, because the downhole working conditions are in a complex environment of high temperature and high pressure, measurement and analysis are extremely difficult. At the same time, because the entire drilling system involves the randomness and nonlinearity of the interaction between the drill string, well wall, drill bit and rock, theoretical research is difficult. It is also very large, so there are few theoretical studies and evaluation techniques to provide support and reference for drilling design, drilling tool combination optimization, drilling parameter optimization, bit selection and drilling speed increase, etc.

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