Crude-oil pipeline wax deposit pigging simulation experiment method
A technology for simulating experiments and wax deposition, applied in cleaning methods and utensils, chemical instruments and methods, material inspection products, etc., can solve problems such as pipeline shutdown accidents
Pending Publication Date: 2019-09-06
CHINA PETROLEUM & CHEM CORP +1
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[0104] Under the experimental conditions shown in Table 1, wax deposition experiments were carried out. After reaching the set time of the wax deposition experiment, switch to the pigging process. Under the experimental conditions shown in Table 2, the pigging operation was carried out. For the jet pig 42, under the experimental conditions shown in Table 3, the settling of real wax deposit particles in the oil wax slurry under dynamic conditions and static conditions was observed.
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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...
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IPC IPC(8): G01N33/28G01N5/04G01N25/02G01N15/02B08B9/057
CPCG01N33/2823G01N5/04G01N25/02G01N15/0205B08B9/057
Inventor 王国涛李亚平王军防曹旦夫张春王长保余红梅赵新颖孙丽刘欣王爱菊张高平
Owner CHINA PETROLEUM & CHEM CORP
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