Method and equipment for measuring axial force and lateral force of casing pipe in three-dimensional borehole

Abstract

The invention provides a method and equipment for measuring axial force and lateral force of a casing pipe in a three-dimensional borehole. The method includes the steps of obtaining track measuring point data of the three-dimensional borehole; selecting a casing string between two random data points in the track measuring point data to serve as a micro unit; collecting curvature, the length and effective gravity of the micro unit, inertia moment, elasticity modulus, a first hole deviation angle, a second hole deviation angle, a first azimuth angle and a second azimuth angle of a cross section and a coefficient of friction resistance of the borehole; determining axial force of a second end, axial force of a first end and lateral force of the micro unit in the unit length; determining the axial force and lateral force of the casing pipe in the three-dimensional borehole according to the axial force of the second end, the axial force of the first end of the micro unit and the lateral force of the micro unit in the unit length. The method not only can be used for designing strength of the casing pipe and have all-important reference value in project design and adjustment of well drilling, well completion, oil extraction and workover job, but also serves as the basis for assessing anti-collapsing capacity of the casing pipe.

Description

Technical field [0001] The present invention relates to the technical field of oil exploitation and well drilling and completion, in particular to the design technology of casing strength in a three-dimensional wellbore. Specifically, it is a method and equipment for measuring the axial force and lateral force of the casing in a three-dimensional wellbore. Background technique [0002] In my country's oil production, the proportion of heavy oil is increasing year by year. Heavy oil production mainly adopts thermal oil recovery technology, including wellbore heating, hot water flooding, hot steam flooding, steam huff and puff, and burning oil reservoirs, among which steam injection is the real large-scale application. However, while the steam injection method improves the economic benefits of mining, it also damages the rock structure around the casing, thereby reducing the service life of the oil well and even causing the oil well to be scrapped. As the channel between the produ...

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Problems solved by technology

In the prior art, the precise solution to this difficult problem generally adopts the theory of vertical and horizontal bending beams in initial bending, writes a multivariate linear equation system based on the three bending moment equations, and then uses a computer to solve it simultaneously, but this method involves a lot of formulas and data , and the formulas and methods are very complicated, and the calculation process is cumbersome and lengthy, which greatly reduces the measurement efficiency of the axial force and lateral force of the worn casing, which in turn affects the measurement of the axial force and lateral force of the worn casing. , completion, oil production and well workover operation scheme design and adjustment efficiency

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