Crude-oil pipeline wax deposit pigging simulation experiment method

Abstract

The invention discloses a crude-oil pipeline wax deposit pigging simulation experiment method. By controlling the temperature difference between an oil flow and a pipe wall, a wax deposition experiment is carried out in a wax removal testing pipe section; after a preset deposition time arrives, pressure at two ends is measured through pressure sensors at two ends, the thickness of the deposition layer is further obtained in the wax removal testing section, a pigging process is then carried out, a pig is sent by a launcher, pigging operation is carried out in the wax removal testing stage underpushing by the oil flow, the process of pushing ball ahead wax blocking or oil wax slurry by the pig is observed through a transparent testing section, the quality before wax deposition and after waxremoval in the wax removal testing stage is obtained, and the wax removal efficiency during a one-time pigging process is measured. Through analyzing the thickness of the deposition layer in the waxremoval testing stage and the wax removal efficiency of different pigs during the one-time pigging process, teh wax removal mechanism in the actual pigging process is studied, the problems of ball clamping, wax blocking and the like during the actual pipeline ball passing wax removal process are solved, and more scientific guidance is provided for actual pigging operation.

Description

technical field [0001] The invention belongs to the technical field of crude oil pipeline wax deposit simulation equipment, in particular to a crude oil pipeline wax deposit pigging simulation experiment method. Background technique [0002] Wax deposition is a serious challenge in the field of flow assurance for waxy crude oil pipelines. When the temperature of the pipe wall drops below the temperature of the wax precipitation point of crude oil, the solubility of wax molecules at the pipe wall decreases, resulting in the precipitation of wax molecules from the crude oil to form wax crystals, which are deposited on the pipe wall. However, the temperature at the center of the oil flow is high, and the concentration of wax molecules is high. The wax molecules migrate to the pipe wall under the action of molecular diffusion, and form wax crystals, resulting in the formation of wax deposits on the pipe wall. During the production and transportation of waxy crude oil, the ambie...

AI Technical Summary

Problems solved by technology

If the above two problems cannot be solved in time, it is very easy to cause the suspension of production and transportation of the pipeline.

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