Sulfur solvent for cleaning sulphur deposition in wellhole

A technology for cleaning well bores and sulfur solvents, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., and can solve problems such as low solubility, limited sulfur load capacity, and long on-site operation time

Inactive Publication Date: 2010-09-08
SOUTHWEST PETROLEUM UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the main disadvantages of physical solvents are: (1) low solubility, limited sulfur loading capacity, and a large amount of solvent needed to clean and process the same weight of sulfur; (2) low sulfur dissolution rate, long on-site operation time, and increased operating costs
Field tests show that the stability of the system is greatly challenged: (1) The purity requirements for

Method used

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  • Sulfur solvent for cleaning sulphur deposition in wellhole
  • Sulfur solvent for cleaning sulphur deposition in wellhole
  • Sulfur solvent for cleaning sulphur deposition in wellhole

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The main agent is 90% by weight of dimethyl disulfide DMDS, 3.0% by weight of the catalyst (the catalyst is composed of 80% by weight of diethanolamine and 20% by weight of sodium methylate), and the corrosion inhibitor is 7.0% by weight of β-diethyl Aminophenyl ketones.

[0036] When used at 90°C, the solubility of sulfur reaches 421g, the time t1 / 2 needed to dissolve 50% by weight of sulfur is 0.96 minutes, and the average dynamic corrosion rate of N80 coupons is 0.081g / h.m2. Visible pitting and pitting.

[0037] After 30 days of aging and maintenance at room temperature, at 90°C, the solubility of sulfur reaches 420g, the time t1 / 2 required to dissolve 50% of sulfur by weight is 0.99 minutes, and the average dynamic corrosion rate of N80 coupons is 0.080g / h.m2, The surface of the steel sheet is smooth and clean, without pitting and pitting corrosion visible to the naked eye.

Embodiment 2

[0039] The main agent is 90% by weight of dimethyl disulfide DMDS, 3.0% by weight of the catalyst (the catalyst is composed of 80% by weight of triethanolamine and 20% by weight of sodium methylate), and the corrosion inhibitor is 7.0% by weight of β-rosinamine phenyl ketones.

[0040] When used at 90°C, the solubility of sulfur reaches 431g, and the time t1 / 2 required to dissolve 50% by weight of sulfur is 0.72 minutes. The average dynamic corrosion rate of N80 coupons is 0.064g / h.m2. Visible pitting and pitting.

[0041] After 120 days of aging and maintenance at room temperature, at 90°C, the solubility of sulfur reaches 433g, the time t1 / 2 required to dissolve 50% of sulfur by weight is 0.74 minutes, and the average dynamic corrosion rate of N80 coupons is 0.066g / h.m2, The surface of the steel sheet is smooth and clean, without pitting and pitting corrosion visible to the naked eye.

Embodiment 3

[0043] The main agent is 90% by weight of dimethyl disulfide DMDS, 3.5% by weight of the catalyst (the catalyst is composed of 80% by weight of polyalkylene hydroxylamine and 20% by weight of sodium ethylate), and the corrosion inhibitor is 6.0% by weight of β-rosinaminophenyl ketone.

[0044] When used at 90°C, the solubility of sulfur reaches 465g, the time t1 / 2 required to dissolve 50% by weight of sulfur is 0.45 minutes, and the average dynamic corrosion rate of N80 coupons is 0.056g / h.m2. Visible pitting and pitting.

[0045]After 120 days of aging and maintenance at room temperature, at 90°C, the solubility of sulfur reaches 462g, the time t1 / 2 required to dissolve 50% of sulfur by weight is 0.47 minutes, and the average dynamic corrosion rate of N80 coupons is 0.058g / h.m2, The surface of the steel sheet is smooth and clean, without pitting and pitting corrosion visible to the naked eye.

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Abstract

The invention relates to a sulfur solvent for cleaning sulphur deposition in the wellhole, which consists of the following components: 90 to 95 weight percent of host crystal, 0.5 to 3.5 weight percent of catalyst and 1.5 to 7.5 weight percent of corrosion inhibitor, wherein the host crystal is dialkyl disulfide or diphenyl disulfide; the catalyst is organic amine, lewis base or a mixture of the organic amine and lewis base; and the corrosion inhibitor is beta-diethylin phenyl ketone or beta-abietylamine phenyl ketone or a mixture of the beta-diethylin phenyl ketone or the beta-abietylamine phenyl ketone. The sulfur dissolving rate and the sulfur-bearing quantity of the invention are superior to the common physical solvent, such as aliphatic hydrocarbon, benzene, CS2 and the conventional chemical solvent. The sulfur solvent can be used for cleaning and relieving sulphur deposition blockage of the wellhole of the high-sulfur gas well.

Description

technical field [0001] The invention relates to a sulfur solvent for cleaning the sulfur deposition in the shaft of a high-sulfur gas well. Background technique [0002] The physical properties of high-sulfur natural gas are quite different from those of conventional natural gas. In the process of natural gas exploitation, as the gas is produced, the formation pressure continues to drop, and elemental sulfur will be precipitated from the sulfur-carrying gas in the form of monomers. It exists in the form of solid sulfur under temperature conditions, and deposits in different parts of the wellbore, affecting the flow of natural gas. This not only causes serious harm to the normal operation of the gas well, but also brings many difficulties to the maintenance of production equipment. Once sulfur deposition occurs, the degree of sulfur plugging will become more and more serious as the production progresses, eventually leading to the shutdown of the gas well. For example, the Zh...

Claims

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Application Information

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IPC IPC(8): C09K8/532
Inventor 赵金洲陈红军郭建春李勇明李明志
Owner SOUTHWEST PETROLEUM UNIV
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