Personalized drill bit dynamic design method for complex difficult-to-drill stratum

Abstract

The invention discloses a personalized drill bit dynamic design method for a complex and difficult-to-drill stratum. The personalized drill bit dynamic design method comprises the following steps thatS1, rock drillability indexes of the drilled stratum are obtained; s2, performing drill bit tooth rock breaking digital simulation analysis and a gear ring and drill bit composite rock breaking experiment, and establishing a shaft bottom rock interaction mechanical model; s3, establishing a drill string Drill bit The rock system is coupled with the overall dynamic model; s4, designing the toothshape, the tooth distribution density, the crown shape and the gauge protection structure according to the rock mechanical property of the complex difficult-to-drill stratum; s5, optimizing the parameters of the nozzle and the hydraulic structure of the drill bit by utilizing a computational fluid dynamics theory and a numerical simulation method; s6, a tooth material cobalt removal strengtheningtechnology, a high-strength drill bit body material technology and a special tooth-shaped tooth technology are adopted, and the manufacturing process of the drill bit is optimized; the personalized drill bit design method has the advantages that the personalized drill bit design method for the complex and difficult-to-drill stratum is provided, so that the drill bit development period is shortened, and the development cost is reduced.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploration and development, in particular to a dynamic design method for a personalized drill bit in complex and difficult-drill formations. Background technique [0002] With the deepening of exploration and development of oil and gas fields, the focus of oil and gas development has gradually shifted to oil and gas resources in deep formations, so the formation structures encountered are becoming more and more complex, and drilling is becoming more and more difficult, including deep wells, ultra-deep wells and wells with complex structures Wait. The burial conditions of deep oil and gas resources are complicated (including high temperature, high pressure, high sulfur content and low permeability, etc.), with the characteristics of deep burial, compact rock, large changes in formation lithology, poor drillability, high quartz content and strong abrasiveness. When drilling in this type of for...

AI Technical Summary

Problems solved by technology

Previously, the drill bit design assumed that the rock was a homogeneous flat well bottom, without considering the impact of the drill bit structure, tooth shape, tooth placement method and formation rock (hardness, strength, Poisson's ratio, in-situ stress, etc.) on the drill bit design, which could not meet the requirements Requirements for individual design of drill bits

At present, there are few studies on individualized bit design methods for complex and difficult-to-drill formations in deep wells

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