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Sulfur dispersion stabilizer to prevent sulfur blocking of sulfur-evolving wellhead

A technology of dispersing stabilizer and sulfur, which is applied in wellbore/well components, drilling compositions, cleaning tools, etc., which can solve the problems of strong irritation, high price, and large dosage, so as to reduce surface tension and reduce cleaning Effects of cycle, prevention of aggregation and adhesion

Inactive Publication Date: 2019-01-04
SINOPEC ENERGY & ENVIRONMENTAL ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these organic solvents are expensive, used in large amounts, and have a strong irritant

Method used

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  • Sulfur dispersion stabilizer to prevent sulfur blocking of sulfur-evolving wellhead

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1 indoor test

[0017] First prepare ethanol and isopropanol aqueous solutions with concentrations of 200, 500, and 1000mg / L respectively, add 10wt% sulfur, observe the wetting speed and degree of sulfur in water, and the results are as follows:

[0018] Table 1 The wetting effect of ethanol and isopropanol on sulfur

[0019]

[0020] Comparing the wetting effect of ethanol and isopropanol on sulfur, as the amount of alcohol increases, the amount of sulfur wetting increases. When the amount is greater than 500mg / L, sulfur can be wetted by 100%, and the wetting time becomes shorter as the amount of alcohol increases. , The wetting time is 35-40 seconds when it is greater than 500mg / L. Ethanol and isopropanol have the same wetting effect on sulfur, so ethanol is selected as the wetting agent for the following experiments.

[0021] Prepare an aqueous ethanol solution with a concentration of 500mg / L, then add polyacrylamide to the aqueous ethanol solution, a...

Embodiment 2

[0024] Well P3011 in Puguang Gas Field has a gas volume of 200,000 cubic meters per day and a hydrogen sulfide content of 8%. The mist catcher of the acid separation separator will be blocked in about 4 months on average under production conditions. By adding sulfur dispersant containing 500mg / L ethanol and 1g / L polyacrylamide polymer, it can be observed that under the action of sulfur dispersant, the surface tension of elemental sulfur is reduced, and water and sulfur form a homogeneous phase The mixed system reduces the adhesion and deposition characteristics of sulfur, and the sulfur particles are separated from the water by centrifugal separation, thereby reducing the deposition and clogging of sulfur. By adding sulfur dispersion stabilizer to the system, the time to clean up the clogging is shortened from 3 Once a month becomes every 4 months.

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Abstract

A sulfur dispersion stabilizer to prevent sulfur blocking of a sulfur-evolving wellhead is a solution prepared with lower alcohol and polyacrylamide macromolecule polymer as a component and water as asolvent in a certain ratio. Existing conventional sulfur deblocking methods include injection of sulfur melting agents, heating and other washing modes; the sulfur melting agents are mostly high in price, toxic and harmful and have stinking smell. The sulfur dispersion stabilizer herein is a nontoxic, odorless, secondary-pollution-free green environment-friendly agent; by adding the sulfur dispersion stabilizer into a sulfur-bearing natural gas well blocking point, surface tension of sulfur particles can be effectively reduced, sulfur aggregation and adhesion can be prevented, the sulfur particle adhesion and precipitation problems can be solved, and pipeline and equipment washing periods can be greatly shortened.

Description

technical field [0001] The invention belongs to the technical field of oil and gas gathering and transportation, and in particular relates to a sulfur dispersion stabilizer for preventing sulfur clogging at the head of a sulfur analysis well. Background technique [0002] According to data surveys, in my country's natural gas resources, natural gas containing hydrogen sulfide occupies a relatively high proportion, and the gas reservoirs with hydrogen sulfide content exceeding 1% account for about 1 / 4 of my country's natural gas reserves. Therefore, the safe and efficient development and utilization of sour gas reservoirs is of great significance to meet my country's demand for natural gas for a long period of time in the future. During the production process of sour gas wells, there is still dissolved elemental sulfur in the reservoir. When the pressure and temperature decrease, sulfur deposits on the equipment or pipe wall, blocking the gas flow passage and affecting the nor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/532E21B37/06
CPCC09K8/532E21B37/06
Inventor 李金环朱红彬李清方张硕琳傅莉张新军张宁宁董金婷栾胜杰
Owner SINOPEC ENERGY & ENVIRONMENTAL ENG CO LTD
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