Method for measuring wax deposition amount of oil pipeline based on pressure wave method

Abstract

The invention relates to a method for measuring the wax deposition amount of an oil pipeline based on a pressure wave method and belongs to the technical field of fluid mechanics research. When fluidin the pipeline is fully developed and the flow state reaches a turbulent state, a valve on the downstream position of the pipeline is quickly closed at the time t, the fluid generates transient flowin the pipeline, and the surge wave is propagated to the right edge of a wax deposition section at time t plus delta t and reflected; the incident wave and the reflected wave at the right edge of thewax deposition section are used as the object of study, and the wax deposition area can be obtained by obtaining the magnitude of the incident wave delta HW and the magnitude of the reflected wave delta HF in the transient state. The method has the beneficial effects that the method for determining the plugging amount by the pressure wave method is further studied theoretically, so that the wax deposition amount can be identified by the pressure wave method; by the adoption of the method, the wax deposition amount can be effectively detected, meaningful guidance information can be provided fora manager to conduct plugging removal operation, the labor and material losses and economic losses caused by plugging in the plugging removal work are greatly reduced, and the method has practical significance for the problem about detection of the pipe plugging.

Description

technical field [0001] The invention belongs to the technical field of fluid mechanics research, and in particular relates to a method for measuring wax deposition in oil pipelines based on a pressure wave method. Background technique [0002] The so-called "waxing" actually refers to the deposition of a certain thickness of paraffin, colloid, condensate, sand and other mechanical impurities on the inner wall of the pipeline. Due to the wax deposition in the pipeline, the inner diameter of the pipeline becomes smaller, the frictional resistance along the pipeline increases, and the conveying capacity decreases. In order to ensure the transportation capacity of the pipeline, the pipeline should be pigged regularly, and the amount of wax deposition plays a decisive role in the formulation of the pigging cycle. Limited to the current measurement technology, there is no relatively complete formula to describe the wax deposition on the inner wall of the pipeline. If the amount o...

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