Method for measuring and calculating downhole power loss of rod-pumped wells

Abstract

The invention relates to the technical field of oil production, in particular to a method for measuring and calculating downhole power loss of rod-pumped wells, which mainly solves problems that existing measurement and calculation methods are incapable of reflecting components of downhole power loss objectively, incapable of properly handling irregularity of well deflection tracks and the defect that viscosity of crude oil varies along with temperature. The method includes the following steps: measuring and calculating downhole sliding friction power loss of the rod-pumped wells; measuring and calculating downhole viscous friction power loss of the rod-pumped wells; and measuring and calculating the downhole power loss of the rod-pumped wells according to the measured and calculated downhole sliding friction power loss and downhole viscous friction power loss. The method reflects components of the downhole power loss objectively, effectively prevents affection of irregularity of well deflection tracks and the defect that viscosity of crude oil varies along with temperature onto measurement and calculation of the downhole power loss, is capable of accurately measuring and calculating the downhole power loss of specific mechanical production systems, and thereby laying a fine foundation for calculation and improvement of input power and efficiency of the mechanical production systems.

Description

technical field [0001] The invention relates to the technical field of petroleum exploitation, in particular to a method for measuring and calculating downhole power loss of a pumping well. Background technique [0002] At present, most of the oil wells in various oil fields are produced by rod pump units. In order to improve the efficiency of the mechanical recovery system of pumping wells, it is necessary to understand the energy consumption law of the rod pump mechanical recovery system. During the oil recovery process of deep well pumps, the energy consumed includes the effective energy used to lift the carried liquid and the energy lost during the lifting process. The lost energy includes surface lost power and downhole lost power. Therefore, accurate and effective measurement of downhole power loss plays a vital role in calculating and improving the efficiency of mechanical mining system. [0003] The existing system loss power calculation method cannot accurately c...

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Problems solved by technology

Furthermore, when calculating the downhole viscous friction loss power, the method of the present invention assumes that the viscosity of each well section is known, and on this basis, the product of the sucker rod length of each differential well section and the viscosity of the corresponding well section is calculated. Integral summation, and considering that the operating speed of the sucker rod is a function of time, thus effectively solving the problem that the viscosity of crude oil changes with depth and temperature in the tubing, making it difficult to solve the problem of viscous friction power loss

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