地质勘探用膨胀波纹管截面设计与选择

Design and Selection of Cross Section of Expandable Convoluted Tube for Geological Exploration

摘要:

膨胀波纹管技术是将圆管制成异形截面管,下入孔内后胀圆维护孔壁稳定的一种新兴钻探技术。针对地质勘探的行业需求，提出了一套膨胀波纹管截面形状的设计理论，系统地阐述了膨胀波纹管截面设计的相关步骤和细节，设计出了6种花形不同尺寸的膨胀波纹管截面设计图。在此基础上，利用ANSYS14.0数值模拟软件对不同的设计截面进行了对比分析，得出了膨胀波纹管选择的3条原则：六瓣梅花形是最佳截面形式；设计截面的波峰和波谷的半径、弧度应尽量接近；在满足护壁压力要求的情况，壁厚应尽量的小。

关键词:钻探;膨胀波纹管;截面设计;形状选择;数值模拟

Abstract:

Expandable profile liner (EPL) is a new drilling technology of hole wall stability maintenance, the round tube is pressed to be special cross-section tube, lowering into the hole, then expanding to circular tube. Aiming at the requirements of geological exploration industry, a set of design theory of expandable profile liner section shape is put forward in this paper, the related steps and details of the design are systematically described, and design diagrams of expandable profile liner section shape of 6 different models and sizes were presented. On this basis, comparative analysis on the different designed section shapes are made by using ANSYS14.0 numerical simulation software, 3 principles for expandable profile liner selection are obtained: plum blossom with six petals is the best section shape; the crest & troughs radius dimensions of the designed section and the radian should be as close as possible; and the wall thickness should be as small as possible under the prerequisite of satisfying the requirements of wall protection pressure.

Key words:drilling; expandable profile liner; cross section design; shape selection; numerical simulation