特种油气藏2018，Vol.25Issue(2)：154-158,5.DOI:10.3969/j.issn.1006-6535.2018.02.031
基于文丘里效应的自循环粒子射流钻井工具设计及模拟分析
Self-Circulating Particle Jet Drilling Tool Design and Simulation Based on Venturi Effect
摘要
Abstract
In order to increase the rate of penetration in deep and ultra-deep well drilling,a downhole self-circu-lating particle jet drilling tool is designed and the corresponding physical model and numerical flow model are also established according to the Venturi effect. Finite element simulation is used to study its feasibility under design op-erating conditions and a sensitivity analysis is also completed for nozzle velocity. Research indicates that when the upper nozzle diameter is less than 30 mm,Venturi effect can be realized and a jet is created in the lower nozzle, which verifies the feasibility of tool principle. The lower nozzle velocity increases and then decreases with the in-crease of throat length. The lower nozzle velocity is less dependent on the diffusion angle of diffusion tube and the throat diameter. However,there is a negative relation between the throat diameter and the lower nozzle velocity when the throat diameter is less than 40 mm. This research theoretically proves the feasibility of particle self-circu-lating jet drilling tool based on Venturi effect,which could provide certain theoretical reference for its further practi-cal application.关键词
文丘里效应/自循环粒子射流/钻井工具/有限元模拟/喷嘴喷速Key words
Venturi effect/self-circulating particle jet/drilling tool/finite element simulation/nozzle velocity分类
能源科技引用本文复制引用
李玮,李世昌,李卓伦,王新胜,朱岩..基于文丘里效应的自循环粒子射流钻井工具设计及模拟分析[J].特种油气藏,2018,25(2):154-158,5.基金项目
国家科技重大专项"高频低幅扭转冲击器及配套工艺技术"(2016ZX05020-002)、"钻井工程一体化软件"(2016ZX05020-006) （2016ZX05020-002）
