Method and device for measuring axial force and lateral force of rod strings in three-dimensional well

Abstract

The invention provides a method and device for measuring axial force and lateral force of rod strings in a three-dimensional well. The method comprises the steps of obtaining track measure point data of the three-dimensional well, selecting one rod string between any two data points from the track measure point data to be used as a rod string unit, collecting the curvature, the length, the effective gravity, the inertia moment and the elasticity modulus of the rod string unit, collecting the first hole drift angle, the second hole drift angle, the first azimuth angle, the second azimuth angle, the well friction resistance coefficient, the stroke, the stroke frequency, the liquid dynamic viscosity in an oil pipe, the pump depth and the ratio between the inner diameter of the oil pipe and the diameter of the rod string of the track measure point corresponding to the rod string unit, determining the axial force of the second end, the axial force of the first end, and the lateral force of the unit length of the rod string unit, and determining the axial force and the lateral force of the rod strings in the three-dimensional well. The method can be used for designing and calculating the control measures of oil extraction eccentricity preventing of a sucker-rod pump, and also can be used for force analysis of the rod strings in the three-dimensional well.

Description

Technical field [0001] The present invention relates to the field of petroleum exploitation technology, especially to the design technology of anti-eccentric wear prevention and control of rod pump mechanical oil extraction in directional wells and horizontal wells. Specifically, it is a method for measuring the axial force and lateral force of the sucker rod string in a three-dimensional wellbore Method and equipment. Background technique [0002] Mechanical oil extraction with rod pumps is a traditional and effective method of extracting oil in vertical wells. Because this method has simple structure, strong adaptability and long service life, it is familiar to the masses. In recent years, although the number of directional wells and horizontal wells has increased day by day, the proportion of mechanical oil extraction methods using rod pumps in these wells is still very large. of. When using a rod pump mechanical oil extraction method in directional wells and horizontal well...

AI Technical Summary

Problems solved by technology

The precise solution of this problem generally adopts the theory of initial bending vertical and horizontal bending beams in the prior art, and 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 requires a lot of formulas and data. 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 sucker rod string in directional wells and horizontal wells, which in turn affects the measurement efficiency of the sucker rod strings in directional wells and horizontal wells. The axial force and lateral force affect the efficiency of the design and adjustment of drilling, completion, oil production and workover operations

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