Long-distance pipeline wax-cleaning agent and wax-cleaning conveying technology method

Abstract

The invention discloses a long-distance pipeline wax-cleaning agent and a wax-cleaning conveying technology method. The wax-cleaning agent is prepared by complex formulation of crude oil, 0 # diesel oil and solvent oil 90 #, wherein the crude oil comprises lower than 6% of wax and has a solubility parameter of 7.0-8.0, and the weight ratio of crude oil: 0 # diesel oil: solvent oil 90 # is 6-8:3-1:1. The wax-cleaning conveying technology method comprises the following steps: 1) estimating the effective volume of a pipeline for wax cleaning; 2) mixing the 0 # diesel oil and the solvent oil 90 # in a weight ratio of 3-1:1, and then mixing the crude oil and a diesel oil and solvent oil mixed solution in a weight ratio of 6-8:1; 3) heating to enable the output temperature to be 50-70 DEG C; 4) pumping a wax-cleaning agent mixed solution into the pipeline from a first station in three times with the dosage for each time being the effective pipeline volume, when oil head arrives a terminal station, testing the wax content of the wax-cleaning agent, and stopping pipeline conveying for 3 days; 5) in sixth and ninth day later, repeating the steps of 2) to 4), and performing the second and third addition of the wax cleaning agent, testing the wax content of the wax-cleaning agent at the terminal station in every 2 hours, and calculating the wax dissolving rate; and 6) outputting from the terminal station.

Description

technical field [0001] The invention relates to a long-distance pipeline wax remover and a wax remover transportation process, and relates to the general method of organic chemistry and the technical field of pipeline systems. Background technique [0002] Most of my country's crude oil is waxy crude oil. During long-distance pipeline transportation, a thick and dense wax layer is formed in the pipeline with temperature changes. In the case of low pipeline throughput, from an economic point of view, in order to reduce the heat loss along the crude oil pipeline, the pigging period is intentionally extended, or even the pipeline is not pigged for a long time, resulting in extremely serious wax deposition on the inner wall of the pipeline, and the wax deposition thickness of some pipe sections reaches up to 100mm. When the pipeline capacity increases and full load operation is required, the pipeline must be dewaxed. There are mainly three methods for wax removal in long-dista...

AI Technical Summary

Problems solved by technology

[0004] For long-distance pipelines that have not been cleaned for a long time, the use of solvent wax removal can avoid ball jamming or wax plugging accidents, but long-distance pipelines use traditional wax removers. There are several major problems. First, the amount of wax remover is large and the cost of wax removal is high. ; Second, if the traditional wax remover is used, the downstream of the pipeline will face the problem of storage and post-processing of the wax remover; in addition, the wax layer on the inner wall of the pipeline has been rolled for a long time by the pigging ball, and the structure is very dense. The temperature is limited by the power of the heating equipment and the safety of transportation. In the pipeline section with severe wax deposition, the temperature of the transportation medium is low, which requires the use of a wax remover with a high wax-dissolving performance.

Images