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 technical field of oil exploitation, in particular to the design technology of anti-eccentric wear prevention and control of rod pump mechanical oil production in directional wells and horizontal wells, specifically a method for measuring the axial force and lateral force of sucker rod strings in three-dimensional wellbore methods and equipment. Background technique [0002] Rod pump mechanical oil recovery is a traditional and effective method of extracting oil in vertical wells. Because the method is simple in structure, strong in adaptability, and long in life, it is familiar to the masses. Therefore, in recent years, although the number of directional wells and horizontal wells has been increasing, the proportion of rod pump mechanical oil recovery methods in these wells is still very large. of. When the rod pump mechanical oil recovery method is used in directional wells and horizontal wells, centralizers or ...

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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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