Sulfur-containing gas well oil pipe blocking remover and preparation method thereof

A technology for removing plugging agents and oil pipes, which is applied in chemical instruments and methods, reagents, earth-moving drilling and mining, etc., and can solve the problems of ineffective blocking removal of oily substances, low flash point, corrosion of ground equipment, pipelines and rubber parts, etc. , to achieve the effect of strong surface active cleaning function, avoid processing difficulty, and avoid the risk of explosion

Active Publication Date: 2020-11-10
SICHUAN SHENGNUO OIL & GAS ENG TECH SERVICE CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] 1. Most of them are organic solvents, with low flash point, high risk of production, storage and transportation, and also greatly increase the risk of explosion at the natural gas mining site
[0010] 2. There is no special plugging remover for production tubing of sulfur-containing gas wells, and water-based surfactant plugging removers are prone to generate a large amount of foam, which seriously affects the normal operation of ground gas-gathering equipment in gas production operations
[0011] 3. For the treatment of backflow wastewater in the later stage, organic solvents or acid blockage removers bring greater difficulty to the treatment of backflow wastewater in the later stage, and the ground equipment, pipelines and rubber parts are seriously corroded
[0012] 4. Existing plug-removing agents are mainly aimed at hydrates and acid-soluble impurities, and have no obvious effect on removing plugs of oily substances

Method used

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  • Sulfur-containing gas well oil pipe blocking remover and preparation method thereof
  • Sulfur-containing gas well oil pipe blocking remover and preparation method thereof
  • Sulfur-containing gas well oil pipe blocking remover and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] (1) Under the condition of heating in an oil bath, first add 15% citric acid into a reaction vessel with a stirrer and a thermometer, heat up and melt the citric acid, then add 20% triethanolamine, continue to heat up to 105°C, and stir Reaction for 4 hours;

[0074] (2) When the acid value of the test reaction system remains unchanged, continue to add 10% triethanolamine and 0.3% sulfamic acid successively at a temperature of 105° C., and stir for 2 hours;

[0075] (3) When the amine value of the test reaction system remains unchanged, continue to add 54.7% ethylene glycol at a temperature of 105°C, and continue to stir and react for 2 hours. The Brookfield viscosity of the test product at 35°C is 216mpa. s is the finished product.

[0076] The relevant performance indicators of the obtained finished product test are shown in the attached table.

Embodiment 2

[0078] (1) Under the condition of heating in an oil bath, first add 20% citric acid into a reaction vessel with a stirrer and a thermometer, heat up and melt the citric acid, then add 22% triethanolamine, continue to heat up to 110°C, and stir Reaction for 4 hours;

[0079] (2) When the acid value of the test reaction system remains unchanged, continue to add 3% triethanolamine and 0.4% sulfamic acid successively at a temperature of 110° C., and stir for 2 hours;

[0080] (3) When the amine value of the test reaction system remains unchanged, continue to add 54.6% ethylene glycol at a temperature of 110°C, and continue to stir and react for 2 hours. The Brookfield viscosity of the test product at 35°C is 215mpa. s is the finished product.

[0081] The relevant performance indicators of the obtained finished product test are shown in the attached table.

Embodiment 3

[0083] (1) Under the condition of heating in an oil bath, first add 17.4% citric acid into a reaction vessel with a stirrer and a thermometer, heat up and melt the citric acid, then add 24% triethanolamine, continue to heat up to 108°C, and stir Reaction for 5 hours;

[0084] (2) When the acid value of the test reaction system remains unchanged, continue to add 8% triethanolamine and 0.6% sulfamic acid successively at a temperature of 108° C., and stir for 2.5 hours;

[0085] (3) When the amine value of the test reaction system remains unchanged, continue to add 50% ethylene glycol at a temperature of 108°C, and continue to stir and react for 3 hours. The Brookfield viscosity of the test product at 35°C is 212mpa.s That is the finished product.

[0086] The relevant performance indicators of the obtained finished product test are shown in the attached table.

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Abstract

The present invention discloses an sulfur-containing gas well oil pipe blocking remover, which is prepared by mixing and reacting the following components: 5-24% of citric acid, 50-55% of ethylene glycol, 25-34% of triethanolamine and 0.3-0.6% of sulfamic acid; technical indices are described as follows: the foaming rate is 6.0-8.5%, the content of water insoluble substances is 2.0-2.5%, the flashpoint (opening) is 112-115 DEG C, the normal-pressure static corrosion rate is 0.45-0.58 g/m2*h, the grease dissolution rate is 92-98%, and water separation rate is zero. The invention also disclosesa preparation method of thesulfur-containing gas well oil pipe blocking remover. The sulfur-containing gas well oil pipe blocking remover disclosed by the invention has a relatively strong surface activity cleaning function, can remove oil and scale in blockages at the same time, gives play to the dual blocking removal effect of an oil pipe, can also avoid the burning explosion risk caused by theuse of flammable and combustible materials in the prior art, and can also avoid the problems of treatment difficulty of flowback wastewater and serious corrosion to equipment and the like; in addition, the preparation method is mature, simple in process operation and easy to control and realize industrial production.

Description

technical field [0001] The invention belongs to the technical field of oil pipe blockage removal agent in gas well and its preparation, and in particular relates to a sulfur-containing gas well oil pipe blockage removal agent and a preparation method thereof. Background technique [0002] In recent years, the clogging of sulfur-containing gas wells has become more and more serious, especially for gas wells whose production has entered the middle and late stages. Scaling and clogging are common in the downhole strings. Maintenance, production stimulation construction, and workover operations have brought different degrees of impact. [0003] According to the development of sour gas wells in Sichuan and Chongqing, during the production process of sour gas wells, sulfur element or sulfide deposits, oil scale deposits, calcium scale deposits, condensate oil and wax deposits, and metal corrosion deposits may be formed in the production tubing Sedimentary clogging of multiple com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/524C09K8/528C09K8/532E21B37/06
CPCC09K8/524C09K8/528C09K8/532E21B37/06Y02P20/141
Inventor 缪云覃芳朱庆杨永韬曾诚唐思洪陈飞虎王际晓何威利张超王泽东
Owner SICHUAN SHENGNUO OIL & GAS ENG TECH SERVICE CO LTD
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