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Synthetic method of novel corrosion inhibitor dithiocarbamate for completion fluid

A technology of dithioamino group and synthesis method is applied in the synthesis field of completion fluid corrosion inhibitor, which can solve the problems of electrochemical corrosion, surface pitting corrosion of metal equipment, economic loss and the like, and achieves the effect of stable performance

Inactive Publication Date: 2011-06-08
武侯区巅峰机电科技研发中心
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The completion fluid contains corrosive electrolytes, which will inevitably lead to electrochemical corrosion of downhole tubing, casing and downhole equipment; and electrochemical corrosion can induce or even accelerate the occurrence of other corrosion behaviors such as stress corrosion, pitting corrosion, crevice corrosion, and hydrogen embrittlement; for The low-solid, solid-free, various brine and positive gel completion fluid systems used to meet the needs of various completion processes contain a variety of additives, which are strongly corrosive under the action of high temperature and high pressure downhole , especially the large amount of solid-free brine completion fluid used in offshore well completion operations further increases the corrosiveness of the completion fluid, which can cause metal corrosion such as surface pitting and hydrogen embrittlement of oil and gas well tubing and downhole metal equipment, and also It may lead to sudden rupture of downhole pipes and cause serious economic losses

Method used

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  • Synthetic method of novel corrosion inhibitor dithiocarbamate for completion fluid
  • Synthetic method of novel corrosion inhibitor dithiocarbamate for completion fluid
  • Synthetic method of novel corrosion inhibitor dithiocarbamate for completion fluid

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Effect test

Embodiment 1

[0031] The product yield reflects the amount of effective product produced in the experiment. The higher the product yield, the greater the proportion of effective products in the product, which has a greater impact on the performance of the compound. Through a large number of experiments, it is found that the ratio of raw materials, the amount of KOH, the reaction temperature and the reaction time and other factors have a great impact on the yield and performance of the synthesized product dithiocarbamate. Therefore, this experiment first carried out a single factor experiment to investigate the influence of each factor on the yield of the synthetic product dithiocarbamate, and determine the optimal value range of each influence factor.

Embodiment 2

[0033] The experiment proves the effect of the molar ratio of carbon disulfide and carbonamide on the yield of the product. During the experiment, the fixed reaction raw material CS 2 and NH 2 CONH 2 The total molar weight is 1.0 mol, and the synthesis research is carried out under the condition of changing the molar ratio between them. The fixed KOH dosage is 37.5g, the reaction temperature is 45°C, and the reaction time is 2.5h. Theoretically considering CS 2 and NH 2 CONH 2 The molar ratio is 2:1, based on this change CS 2 with NH 2 CONH 2 Experiments were carried out with the molar ratio between them, and the product yield was used as the detection index to investigate its influence on the product yield. The results are as follows figure 1 shown.

[0034] According to the theoretical analysis, when CS 2 with NH 2 CONH 2 When the molar ratio is small, CS 2 The conversion rate is very high, although the small ratio is beneficial to CS 2 The complete reaction, b...

Embodiment 3

[0037] The experiment proves that the amount of KOH affects the yield of the product. It can be seen from the chemical reaction equation of the synthesized product dithiocarbamate that the base is used as the reactant, which also shows that the synthesis reaction is an alkali-consuming reaction. Therefore in this synthesis reaction, the amount of KOH is an important factor affecting the performance of the synthesis product dithiocarbamate corrosion inhibitor; During the process, a solid base must not be used as a reactant, otherwise, the experiment will fail or even cause an accident.

[0038] Fixed reaction material CS 2 with NH 2 CONH 2 The molar ratio was 2.2:1, the reaction temperature was 45°C, and the reaction time was 2.5h. The amount of KOH used in the reaction was changed, and the product yield was used as an index to investigate its influence on the amount of dithiocarbamate in the synthetic product. The results Such as figure 2 shown.

[0039] Depend on figure...

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Abstract

The invention relates to a synthetic method of novel corrosion inhibitor dithiocarbamate for completion fluid, wherein the molar ratio of raw materials CS2, carbonyl diamine and KOH is 2.2:1:2.14, and the synthetic method includes the following steps: (1) a mixture of carbonyl diamine and KOH is added in a three-mouth flask, then is continuously stirred; (2) after being fully mixed, the mixture is kept at the temperature range of 42-46 DEG C, and CS2 is added dropwisely; (3) reaction system is kept at the temperature range of 42-46 DEG C and is further stirred; (4) the mixture is controlled at any temperature in the range of 45-50 DEG C, and undergoes constant-temperature reaction for 2-3 hours; (5) after the reaction is finished, the mixture is stirred, cooled, crystallized, and filtered, and the filter cake is dried at the temperature range of 45-50 DEG C under vacuum to obtain the product. The obtained dithiocarbamate possesses stable performance, good dissolvability, and no emulsification tendency. The yield of product in the method is high.

Description

technical field [0001] The invention relates to a synthesis method of a well completion fluid corrosion inhibitor for petroleum exploration, in particular to a synthesis method of a novel well completion fluid corrosion inhibitor dithiocarbamate. Background technique [0002] The phenomenon that metal materials undergo performance degradation, state change, and damage and deterioration under the chemical or electrochemical action of the surrounding environment medium is called metal corrosion. After the metal is corroded, its performance is significantly reduced. The harm caused by corrosion to the metal is not only the loss of the metal itself, but more seriously, the entire metal structure is destroyed. It is estimated that the amount of metals scrapped due to corrosion is equivalent to 25-33.3% of the annual output of metals in the world, and the annual economic loss caused by corrosion in my country is as high as 500 billion yuan, accounting for about 4-5% of the gross n...

Claims

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Application Information

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IPC IPC(8): C07C333/16C09K8/035
Inventor 黄友华
Owner 武侯区巅峰机电科技研发中心