Method for removing metal in high-acid heavy crude oil

A technology for heavy crude oil and demetallization agent, which is applied in chemical dehydration/demulsification, petroleum industry, refined hydrocarbon oil, etc. High metal removal rate and small dosage

Inactive Publication Date: 2013-07-24
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patents CN1454967A and CN1106462C disclose the use of strong acid to make weak acid, and use inorganic acid or organic acid to react with petroleum salt in crude oil to obtain water-soluble calcium salt and petroleum acid. The advantage of the method is the primary removal rate of calcium The disadvantage is that the industrial acid used and the petroleum acid produced have a corrosive effect on the refining equipment; the patent CN1054261A discloses the use of ammonium phosphate as a precipitant, and the use of hydrohydroxyphenol and sulfate as a solid wetting agent and calcium in crude oil The action produces hydrophilic slightly soluble or poorly soluble salts
[0005] The methods for removing metals in crude oil summarized above have a certain removal effect on Ca and Mg, but the efficiency is not high
When used to process high-calcium crude oil, there will be a large amount of demetallization agent and high cost, resulting in the inability to industrialize

Method used

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  • Method for removing metal in high-acid heavy crude oil
  • Method for removing metal in high-acid heavy crude oil
  • Method for removing metal in high-acid heavy crude oil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～4

[0020] Under the condition of 90°C, mix the demetallization agent with the molar ratio of the crude oil to be removed to the calcium agent of 1.5, 2.0, 2.5, and 3.0, the water injection with the weight of 6% of the crude oil, and the demulsifier of 30ppm. In the electric desalination tank, the DPY-2B type electric desalination demulsifier evaluation instrument is used to conduct oil-water separation experiments. The electric desalination temperature is 125°C, the strong electric field strength is 900V / cm, the residence time is 3 to 6 minutes, and the weak electric field strength is 400V / cm cm, the residence time is 5-8 minutes, and the settling time is 30 minutes. The stripped crude oil was pretreated by dry ashing, and the metal content was determined by plasma emission spectrometry. The results are shown in Table 1.

[0021] Table 1 Table of metal content in crude oil before and after the experiment

[0022]

[0023] It can be seen from Table 1 that for the experimental...

Embodiment 5～6

[0025] Select experimental crude oils B and C as the crude oils to be tested respectively. Under the condition of 120°C, mix the demetallizing agent with a molar ratio of 2.5 between the crude oil to be desorbed and the calcium agent, water injection with a weight of 6% of the crude oil, and 30 ppm demulsifier. The method of Example 1 was used for the desalination and dehydration experiment, and the results are shown in Table 2.

[0026] Table 2 Table of metal content in crude oil before and after the experiment

[0027]

[0028] It can be seen from Table 2 that when the molar ratio of agent to calcium is 2.5, it also has a good demetallization effect on experimental crude oils B and C.

Embodiment 7～10

[0030] Select several demulsifiers widely used in domestic refineries. Under the condition of 120°C, mix the demetallizer with a molar ratio of 2.5 between crude oil and calcium agent to be removed, water injection with a weight of 10% of crude oil, and 30ppm demulsifier. The method of Example 1 is used to carry out the experiment of electric desalination and dehydration. The results are shown in Table 3.

[0031] Table 3 Table of metal content in crude oil before and after the experiment

[0032]

[0033] It can be known from Table 3 that under the demetallization method of the present invention, the demetallizer and demulsifier used have good compatibility.

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Abstract

The invention discloses a method for removing metal in high-acid heavy crude oil. The method is characterized by comprising the following steps of: fully mixing and emulsifying the crude oil, a demetallization agent, injected water and a demulsifying agent at the temperature of 30-150 DEG C so that the metal in the crude oil enters into water phase in a form of a water-soluble ionic compound, wherein the mole number of the demetallization agent is 1-4 times total calcium mole number in the crude oil, the weight of the injected water is 2-10% that of the crude oil, and the demulsifying agent is 5-70ppm relative to the crude oil; and finally removing the metal by means of oil-water separation, wherein the crude oil demetallization agent comprises the following ingredients in percentage by weight: 20-40% of a chelating agent, 20-40% of inorganic acid, 0.1-5% of a dispersing agent or a surface active agent, 0.5-3% of a corrosion inhibitor and 20-40% of injected water.

Description

Technical field: [0001] The invention relates to crude oil treatment technology, and is a method for removing metals in high-acid heavy crude oil, in particular to a method for removing metal elements such as calcium and magnesium from high-acid heavy crude oil. Background technique: [0002] With the continuous development of crude oil extraction technology, more and more heavy and low-quality crude oil has been extracted. The content of metals in these crude oils, especially Ca and Mg, is getting higher and higher. The high-acid heavy crude oil extracted from the sea has a particularly high content of calcium metal in some crude oil, which can reach more than 200mg / L. Studies have shown that the increase of calcium and magnesium content in crude oil will have a serious impact on the subsequent processing of crude oil. For example: (1) In the atmospheric and vacuum unit, calcium salts will scale on the inner wall of the heat exchanger, which will increase energy consumpti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G32/02C10G29/00C10G33/04
Inventor 黄占凯丁秋炜王松滕厚开陈军张艳芳
Owner CHINA NAT OFFSHORE OIL CORP
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