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Sulfur solvent for controlling or remitting sulfur deposition

A technology of sulfur solvent and sulfur deposition, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of reducing sulfur dissolving ability, solvent separation and recovery difficulties, etc.

Active Publication Date: 2013-07-31
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both USP4322307 and USP 20090136414 have introduced a sulfur solvent based on alkylnaphthalene, and the sulfur solvent of the mixture of alkylnaphthalene can eliminate the elemental sulfur deposition in the downhole of the gas well or in the ground gathering and transportation pipeline through the physical solubility of the elemental sulfur. The application of the method avoids foul smell and toxicity, but still does not solve the local corrosion problem caused by the sulfur solvent, especially after dissolving the elemental sulfur, to the metal material. In addition, the specific gravity of the solvent (1.001g / cm 3 ) is close to the specific gravity of gas field water. When applied to water-producing gas wells, oil-water emulsification will occur, which will reduce the ability to dissolve sulfur and make subsequent separation and recovery of solvent difficult.

Method used

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  • Sulfur solvent for controlling or remitting sulfur deposition
  • Sulfur solvent for controlling or remitting sulfur deposition
  • Sulfur solvent for controlling or remitting sulfur deposition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1, evaluation of dissolving sulfur ability

[0021] Evaluation method: Add 100ml of sulfur solvent into the Erlenmeyer flask, turn on the constant temperature device and heat the sulfur solvent to 80°C to maintain a constant temperature. Weigh a certain amount of elemental sulfur, add it into the Erlenmeyer flask, and turn on the magnetic stirring device. Determination of elemental sulfur dissolved sulfur solubility after 2h.

[0022] According to the method described in this patent, elemental sulfur solvent formulations with test numbers S1-S5 were prepared, and the evaluation results of elemental sulfur solubility are shown in Table 1. See Table 2 for the sulfur dissolving capacity of S2 formula sulfur solvent element at different temperatures.

[0023] Table 1 Evaluation results of sulfur solvent dissolution

[0024]

[0025] Table 2 Evaluation results of sulfur dissolution by sulfur solvents at different temperatures

[0026]

Embodiment 2

[0027] Embodiment 2, corrosion evaluation

[0028] Test conditions: temperature 80°C, normal pressure, test time 72h, test material L360.

[0029] Test steps: Put 650ml of sulfur solvent into a 1000ml stoppered bottle, hang two pieces of L360 test pieces cleaned according to the standard on a special glass hanger, and put them in a constant temperature water bath at 80°C. After 72 hours, the test piece was taken out, cleaned and weighed according to the requirements of the corrosion test standard, and the corrosion weight loss rate was calculated. The results are shown in Table 3.

[0030] Table 3 Corrosion test results

[0031] sulfur solvent

Embodiment 3

[0032] Embodiment 3, oil-water separation evaluation

[0033] Test conditions: temperature 20°C, normal pressure.

[0034] Test procedure: Vibrate or stir the mixture of sulfur solvent with a ratio of 1:1 and brine with a specific gravity of 1.05 up and down to emulsify it, and evaluate its emulsification tendency and oil-water separation effect based on the stability of the emulsion. If the stratification is fast and the water is more, the more unstable the emulsion is, the smaller the emulsification tendency will be. Table 4 is the evaluation results.

[0035] Table 4 Sulfur solvent oil water separation evaluation

[0036]

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PUM

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Abstract

The invention relates to a sulfur solvent for controlling or remitting sulfur deposition, comprising the following components in percentage by weight: 50-90% of sulfur solvent, 1-15% of corrosion inhibitor and 5-40% of carrier oil; the sulfur solvent comprises a compound with a molecular formula of R1-C10H7 or R1-C10H6-R2, wherein R1 and R2 are selected from branched or unbranched and saturated or unsaturated C1-C7 alkyl groups or alkyl-alkene groups; the corrosion inhibitor comprises a compound with a molecular formula of R1-SH-R-R2, wherein R1 is a short-chain alkyl group or a carboxyl group, R is an imidazoline ring having C7-C17 alkyl branched chains, and R2 is an alkyl group or an amide alkyl group; and the carrier oil is CH3(R)aCH3, wherein R is a linear-chain alkyl group or a branched alkyl group. When the temperature of the solvent is 80 DEG C, 17.5g of elemental sulfur can be dissolved in 100g of sulfur solvent; and when the elemental sulfur and the sulfur solvent are mixed in the proportion of 1:1, the oil-water ratio is 1 after the elemental sulfur and the sulfur solvent are separated for 5min.

Description

technical field [0001] The invention relates to a solvent formula for controlling the deposition of elemental sulfur in the exploitation of natural gas, especially in the exploitation of acidic water-bearing gas wells, that is, a sulfur solution used to control or alleviate the blockage of downhole oil pipe passages or surface gathering and transportation pipelines caused by elemental sulfur deposition formula. Background technique [0002] The inventor has searched and analyzed a large number of domestic related materials, such as the typical CN89107731.6 "Preparation Method of Sulfur Solvent Composition", which uses polysulfide compounds with primary and secondary amine catalysts as sulfur solvents, It has a high ability to remove elemental sulfur, but it has a strong stench and strong toxicity (half lethal dose (rat, inhalation) 0.01mg / L); in addition, the sulfur solvent is easy to induce underground or ground sulfur in an acidic environment. The material is corroded, an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/532
Inventor 杨力唐永帆谷坛霍绍全黄瑛徐智涛
Owner PETROCHINA CO LTD
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