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An amine sulfur-dissolving agent for high-sulfur gas fields

A sulfur-dissolving agent, high-sulfur technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of corrosion of metals and polymer materials, strong alkalinity of sodium hydroxide aqueous solution, and increased viscosity of the system. , to achieve the effect of no strong irritation, low toxicity and low system viscosity

Active Publication Date: 2018-07-27
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this kind of inorganic alkali sulfur-dissolving agent has no foul smell, it has disadvantages: but the aqueous sodium hydroxide solution of inorganic alkali is highly alkaline and corrosive to metals and polymer materials.
Although this kind of amine sulfur solubilizer has no foul smell, it has disadvantages: after reacting with sulfur, the viscosity of the system increases, and even cannot flow, which increases the difficulty of subsequent discharge

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Take 95.0ml of diethylenetriamine (DETA) and put it into a synthesis reaction kettle, add 5.0ml of dimethylformamide (DMF) under stirring conditions, and then stir for 10 minutes under normal temperature and pressure conditions to make a sulfur-dissolving agent . Under normal temperature and pressure, a certain amount of sublimated sulfur powder was added to carry out the evaluation experiment of sulfur dissolving performance. The amount of sulfur dissolved in 30 minutes is 43.5g of sulfur powder / 100ml of sulfur dissolver, and the viscosity of non-Newtonian fluid is 6.2Pa.S; Sulfur agent, the non-Newtonian fluid viscosity is 12.6Pa.S, the amount of dissolved sulfur has decreased by 1.4%, and the viscosity has decreased by 50%.

Embodiment 2

[0017] Take 90.0ml of diethylenetriamine (DETA) and put it into a synthesis reactor, add 10.0ml of dimethylformamide (DMF) under stirring conditions, and then stir for 10 minutes under normal temperature and pressure conditions to make a sulfur-dissolving agent . Under normal temperature and pressure, a certain amount of sublimated sulfur powder was added to carry out the evaluation experiment of sulfur dissolving performance. The amount of sulfur dissolved in 30 minutes is 42.7g of sulfur powder / 100ml of sulfur dissolver, and the viscosity of non-Newtonian fluid is 4.7Pa.S; Sulfur agent, the non-Newtonian fluid viscosity is 12.6Pa.S, the amount of dissolved sulfur has decreased by 3.2%, and the viscosity has decreased by 62%.

Embodiment 3

[0019] Take 85.0ml of diethylenetriamine (DETA) and put it into a synthesis reaction kettle, add 15.0ml of dimethylformamide (DMF) under stirring conditions, and then stir for 10 minutes under normal temperature and pressure conditions to make a sulfur-dissolving agent . Under normal temperature and pressure, a certain amount of sublimated sulfur powder was added to carry out the evaluation experiment of sulfur dissolving performance. The amount of sulfur dissolved in 30 minutes is 41.3g of sulfur powder / 100ml of sulfur dissolver, and the viscosity of non-Newtonian fluid is 4.1Pa.S; Sulfur agent, the non-Newtonian fluid viscosity is 12.6Pa.S, the amount of dissolved sulfur has decreased by 6.3%, and the viscosity has decreased by 67%.

[0020] Examples 4-18, the steps are the same as the above-mentioned examples, and the specific composition ratio and performance evaluation are shown in Table 1 below.

[0021] Table 1 Embodiment 4~18 specific component distribution ratio and...

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Abstract

Belonging to the technical field of chemical agents for oil and gas fields, the invention relates to an amine sulfur-soluble agent for high sulfur-content gas fields. The amine sulfur-soluble agent for high sulfur-content gas fields provided by the invention is formed by mixing of a formamide physical sulfur-soluble agent and a polyethylene polyamine chemical sulfur-soluble agent. The amine sulfur-soluble agent provided by the invention integrates the respective advantages of the physical sulfur-soluble agent and the chemical sulfur-soluble agent, and has the characteristics of simple preparation, no strong irritation, no odor, low toxicity, small corrosion to metal and high polymer materials, low liquid system viscosity after reaction with sulfur and no influence to later emission. Preparation of the sulfur-soluble agent is simple, has small environmental influence, and is convenient for work operation. The sulfur-soluble agent can be widely used for removing sulfur deposition blocking from high sulfur-content gas well bores, surface pipelines and valves, screen meshes and the like.

Description

technical field [0001] The invention relates to an amine sulfur-dissolving agent used in high-sulfur gas fields, and belongs to the technical field of chemical agents for oil and gas fields. Background technique [0002] In the production process of high-sulfur natural gas, when the pressure, temperature, velocity and other factors of the gas flow change, causing the gas flow to reach or exceed the sulfur saturation, elemental sulfur will be precipitated from the gas flow and lead to sulfur deposition. Sulfur deposition may block well bores and gathering pipelines, seriously affecting gas field production; at the same time, deposited elemental sulfur can also cause serious corrosion of well bores and gathering pipelines. For the prevention and control measures of sulfur deposition, in addition to adopting certain measures to avoid elemental sulfur deposition during the mining process, sulfur-dissolving agents are generally used to dissolve the deposited elemental sulfur. Su...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/532
CPCC09K8/532
Inventor 黄雪松张瑛王树涛徐国玲张庆生郭远明伍丹丹陈洪杰
Owner CHINA PETROLEUM & CHEM CORP
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