A Kind of Convenient Method for Testing Strength of Combined Tubing String

Abstract

Constantly use combined tubing string to meet the strengths requirement during oil production and worover job. The maximum setting depth of combination tubing string is relevant to well deviation, casing program, fluid level, as well as tubings material, size, collapsing strength, internal-outer pressure resistance and floatage of holebore fluid. Based on mechanics analysis and mathematical development, obtained mathematical relation which can meet requirement of different combined tubing string, and described relation of conventional tubing string composition length, it can be used for tubing string strengths checking.