Multifunctional composite agent for umbilical cable filling of deepwater oil and gas field and preparation method thereof

Abstract

The application discloses a multifunctional composite agent for umbilical cable filling of a deepwater oil and gas field and a preparation method thereof. The multifunctional composite agent comprises the following components in mass percentage: alkyl benzene sulfonic acid 2-30%, water-soluble polyether 0-15%, organic amine 5-60%, solvent 5-50% and water 0-20%. The multifunctional composite agent has excellent demulsification, corrosion inhibition and sterilization performance, meets the requirements of the umbilical cable filling of the deepwater oil and gas field, and is suitable for crude oil demulsification and sea pipe corrosion control of the deepwater oil and gas field.

Description

Technical Field

[0001] This invention relates to the field of chemicals used in the petroleum industry, and in particular to a multifunctional composite agent for deepwater oil and gas field umbilical cable refueling and its preparation method. Background Technology

[0002] As a key piece of equipment for deep-sea energy development, the umbilical cable is the "nerve and lifeline" connecting surface platform facilities and subsea production systems. In subsea production systems, the umbilical cable is a comprehensive composite cable product, with functional units including electrical cables, optical cables, fluid delivery lines (chemical agent lines, etc.), and gas delivery lines.

[0003] The chemical filling lines in umbilical cables are typically as small as 1 / 2 inch in diameter but can stretch for tens of kilometers, involving dozens of metallic and non-metallic materials. If any node becomes blocked or damaged, the entire chemical filling line is rendered unusable. Therefore, the requirements for umbilical cable chemicals are extremely stringent. They must pass a series of stability, compatibility, and cleanliness tests, including low-temperature stability tests, thermal stability tests, umbilical cable cycling tests, viscosity-temperature tests (ambient temperature and high temperature / high pressure), material compatibility tests, fluid compatibility tests within the umbilical cable, and cleanliness tests, before being allowed to be filled into the umbilical cable. Furthermore, the chemical filling lines in umbilical cables are typically used in three-way configurations with one backup, usually occupied by corrosion inhibitors, scale inhibitors, and bactericides.

[0004] Demulsifiers are rarely injected via umbilical cables, both domestically and internationally. This is because mainstream polyether demulsifiers are difficult to pass stability, compatibility, and cleanliness tests on umbilical cables. Secondly, the number of chemical injection lines within the umbilical cable is extremely limited; priority is given to injecting corrosion inhibitors, scale inhibitors, and bactericides to control corrosion in deepwater oil and gas pipelines. While many deepwater oil and gas fields can typically inject demulsifiers after the produced fluid is brought ashore, developing multifunctional composite agents for umbilical cable injection would provide more options for deepwater oil and gas field development. Summary of the Invention

[0005] To address the limitations of existing technologies regarding the limited number of chemical injection pipelines in umbilical cables and the inability of demulsifiers to be injected through the umbilical cable, this invention provides a multifunctional composite agent for injection into umbilical cables in deepwater oil and gas fields, along with its preparation method. This multifunctional composite agent for injection into umbilical cables in deepwater oil and gas fields offers the advantage of multiple functions in one agent, simultaneously possessing excellent demulsification, corrosion inhibition, and bactericidal properties.

[0006] In a first aspect, the present invention provides a multifunctional composite agent for umbilical cable injection in deepwater oil and gas fields, which is achieved by the following technical solution.

[0007] A multifunctional composite agent for injecting umbilical cables in deepwater oil and gas fields comprises the following components in weight percentages: alkylbenzene sulfonic acid 2%–30%, water-soluble polyether 0%–15%, organic amine 5%–60%, solvent 5%–50%, and water 0%–20%.

[0008] Furthermore, the alkylbenzene sulfonic acid is selected from C1-C6 short-chain alkylbenzene sulfonic acids and C8-C6 short-chain alkylbenzene sulfonic acids. 14 Medium and long chain alkylbenzene sulfonic acid, C 16 One or more of the above long-chain alkylbenzene sulfonic acids.

[0009] Furthermore, the number average molecular weight of water-soluble polyethers is between 2000 and 6000, and the hydroxyl value is ≤50mgKOH / g.

[0010] Furthermore, water-soluble polyethers are prepared by grafting propylene oxide and ethylene oxide onto polyols under alkaline catalyst, vacuum, and 120–140 °C conditions for 8–10 h.

[0011] Furthermore, the polyols include ethylene glycol, propylene glycol, and glycerol.

[0012] Furthermore, the mass ratio of propylene oxide to ethylene oxide is 2:1 to 5:1.

[0013] Furthermore, the organic amine is selected from one or more of monoethanolamine, diethanolamine, triethanolamine, pyridine quaternary ammonium salt, oleic acid imidazoline, imidazoline quaternary ammonium salt, dodecyl dimethyl benzyl ammonium chloride, dodecyl trimethyl ammonium chloride, tetradecyl dimethyl benzyl ammonium chloride, hexadecyl trimethyl ammonium chloride, hexadecyl dimethyl benzyl ammonium chloride, and octadecyl dimethyl benzyl ammonium chloride.

[0014] Furthermore, the solvent may be one or more of methanol, ethanol, ethylene glycol, propylene glycol, and glycerol.

[0015] Secondly, the present invention provides a method for preparing a multifunctional composite agent for umbilical cable injection in deepwater oil and gas fields, which is achieved by the following technical solution.

[0016] A method for preparing the above-mentioned multifunctional composite agent includes the following steps: mixing a specified amount of alkylbenzene sulfonic acid, water-soluble polyether, organic amine, solvent and water, controlling the reaction temperature at 40-60℃, stirring for 30-60 minutes and discharging the material, and using two-stage filtration and circulating filtration to ensure that the cleanliness meets the requirements of NAS 8 standard, thereby obtaining the multifunctional composite agent.

[0017] The multifunctional composite agent for deepwater oil and gas field umbilical cable injection has passed the stability, compatibility and cleanliness tests of the umbilical cable. It is injected into the subsea wellhead through the umbilical cable. The dosage of the multifunctional composite agent is 20-300 ppm, which can meet the requirements of demulsification and corrosion control of subsea pipelines in deepwater oil and gas fields.

[0018] This application has the following beneficial effects.

[0019] To address the contradiction between the need for various reagents in deepwater oil and gas fields via umbilical cables and the limited number of reagent injection pipelines, this method produces a multifunctional composite reagent for deepwater oil and gas field umbilical cable injection. Through tests of umbilical cable stability, compatibility, and cleanliness, it demonstrates that the reagent can be injected into the subsea wellhead via umbilical cable, and only requires a single umbilical cable injection pipeline to meet the multiple functional needs of deepwater oil and gas fields, including demulsification, corrosion inhibition, and sterilization. Detailed Implementation

[0020] The present patent application will be further described below with reference to the embodiments. Unless otherwise specified, the experimental methods used in the following embodiments are conventional methods. Unless otherwise specified, the materials used in the preparation process in the following embodiments have not undergone further processing and have been commercially available.

[0021] The water-soluble polyether used in the following embodiments of the present invention was purchased from Sanda Chemical (Nantong) Co., Ltd., model L62.

[0022] The oleic acid imidazoline used in the following embodiments of the present invention was purchased from Xi'an Wande Energy Chemical Co., Ltd., model WD31-103.

[0023] The imidazoline quaternary ammonium salt used in the following embodiments of the present invention was purchased from Pucheng Yuteng New Material Technology Co., Ltd., and the model number is YTY-05 imidazoline quaternary ammonium salt.

[0024] The pyridine quaternary ammonium salt used in the following embodiments of the present invention was purchased from Pucheng Yuteng New Material Technology Co., Ltd., and the model number is YTY-03 pyridine quaternary ammonium salt. Example 1:

[0025] 191 g of dodecylbenzenesulfonic acid, 63 g of water-soluble polyether, 36 g of monoethanolamine, 175 g of oleic acid imidazoline, 50 g of tetradecyl dimethyl benzyl ammonium chloride, 440 g of ethanol and 45 g of water were mixed and added to a reactor. The reaction temperature was controlled at 60°C, and the mixture was stirred for 60 minutes before being discharged. The discharged material was subjected to two-stage filtration and circulating filtration. The cleanliness met the requirements of NAS 8 standard, thus obtaining the multifunctional composite agent HL-01 for deepwater oil and gas field umbilical cable refueling. Example 2:

[0026] 29 g of dodecylbenzenesulfonic acid, 91 g of water-soluble polyether, 7 g of monoethanolamine, 150 g of imidazoline quaternary ammonium salt, 50 g of pyridine quaternary ammonium salt, 366 g of dodecyl dimethyl benzyl ammonium chloride, 150 g of ethylene glycol, 107 g of ethanol and 50 g of water were mixed and added to a reactor. The reaction temperature was controlled at 60°C and stirred for 60 minutes before being discharged. The discharged material was filtered through a two-stage filtration and a circulating filtration process. The cleanliness met the NAS 8 standard requirements, thus obtaining the multifunctional composite agent HL-02 for deepwater oil and gas field umbilical cable refueling. Example 3:

[0027] 250 g of dodecylbenzenesulfonic acid, 140 g of water-soluble polyether, 50 g of monoethanolamine, 150 g of imidazoline quaternary ammonium salt, 50 g of dodecyl dimethyl benzyl ammonium chloride, and 360 g of ethylene glycol were mixed and added to a reactor. The reaction temperature was controlled at 60°C, and the mixture was stirred for 60 minutes before being discharged. The discharged material was subjected to two-stage filtration and circulating filtration. The cleanliness met the requirements of NAS 8 standard, thus obtaining the multifunctional composite agent HL-03 for deepwater oil and gas field umbilical cable refueling. Example 4:

[0028] 300 g of dodecylbenzenesulfonic acid, 60 g of monoethanolamine, 150 g of oleic acid imidazoline, 100 g of pyridine quaternary ammonium salt, 100 g of dodecyl dimethyl benzyl ammonium chloride, 100 g of ethanol and 190 g of water were mixed and added to a reactor. The reaction temperature was controlled at 60℃, and the mixture was stirred for 60 minutes before being discharged. The discharged material was subjected to two-stage filtration and circulating filtration. The cleanliness met the NAS 8 standard requirements, thus obtaining the multifunctional composite agent HL-04 for deepwater oil and gas field umbilical cable refueling.

[0029] Performance testing 1. Umbilical cable injection test Table 1. Test results of umbilical cable injection with multifunctional composite agents HL-01~HL-04 2. Tests on demulsification performance, corrosion inhibition performance, and bactericidal performance in Examples 1 and 2 (1) Demulsifying performance Experimental oil sample: Crude oil from deep-sea oil and gas field A (crude oil properties: density 0.8 g / cm³) 3 (Wax content 4%, resinous asphalt 3.3%) Oil sample volume (BS&W): 100 ml (45%) Evaluation method: SY / T 5280-2018 "General Technical Conditions for Crude Oil Demulsifiers" Evaluation temperature: 80℃ Table 2. Evaluation data on the demulsification performance of multifunctional composite agents HL-01 and HL-02 (2) Corrosion inhibition performance Experimental water sample: A. Water sample from a deep-sea oil and gas field. Evaluation method: 《SY / T 5273-2014 Performance indicators and evaluation methods for corrosion inhibitors used in oilfield produced water treatment》 Table 3. Evaluation data on the corrosion inhibition performance of multifunctional composite agents HL-01 and HL-02 (3) Sterilization performance Experimental water sample: A. Water sample from a deep-sea oil and gas field. Evaluation Method: 《SYT 5329-2022 Technical Requirements and Analytical Methods for Water Quality Indicators in Clastic Oil Reservoirs》 Table 4. Evaluation data of bactericidal performance of multifunctional compound agents HL-01 and HL-02 3. Tests on demulsification performance, corrosion inhibition performance, and bactericidal performance in Examples 3 and 4 (1) Demulsifying performance Experimental oil sample: Crude oil from deep-sea oil and gas field B (crude oil properties: density 0.94 g / cm³) 3 (Wax content 6%, resinous asphalt 13%) Oil sample volume (BS&W): 100 ml (26%) Evaluation method: SY / T 5280-2018 "General Technical Conditions for Crude Oil Demulsifiers" Evaluation temperature: 40℃ Table 5. Evaluation data on the demulsification performance of multifunctional composite agents HL-03 and HL-04 (2) Corrosion inhibition performance Experimental water sample: B. Water sample from the deep-sea oil and gas field. Evaluation method: 《SY / T 5273-2014 Performance indicators and evaluation methods for corrosion inhibitors used in oilfield produced water treatment》 Table 6. Evaluation data on the corrosion inhibition performance of multifunctional composite agents HL-03 and HL-04 (3) Sterilization performance Experimental water sample: B. Water sample from the deep-sea oil and gas field. Evaluation Method: 《SYT 5329-2022 Technical Requirements and Analytical Methods for Water Quality Indicators in Clastic Oil Reservoirs》 Table 7. Evaluation Data of the Bactericidal Performance of Multifunctional Composite Agents HL-03 and HL-04 The above test results show that the product prepared by this invention has strong universal applicability by adjusting the combination and ratio of the five raw materials. This multifunctional composite agent can pass the stability, compatibility, and cleanliness tests of the umbilical cable. It can be injected into the subsea wellhead via the umbilical cable. Under injection concentration conditions of 20-300 ppm, it has excellent demulsification, corrosion inhibition, and bactericidal functions. Only one umbilical cable injection pipeline is needed to meet the multiple functional requirements of demulsification, corrosion inhibition, and bactericidal action in deepwater oil and gas fields.

[0030] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A multifunctional composite agent for injecting umbilical cables in deepwater oil and gas fields, characterized in that: It includes the following components by weight percentage: alkylbenzene sulfonic acid 2%–30%, water-soluble polyether 0%–15%, organic amine 5%–60%, solvent 5%–50%, and water 0%–20%.

2. The multifunctional composite agent for deepwater oil and gas field umbilical cable injection according to claim 1, characterized in that: Alkylbenzene sulfonic acids are selected from C1-C6 short-chain alkylbenzene sulfonic acids and C8-C6 short-chain alkylbenzene sulfonic acids. 14 Medium and long chain alkylbenzene sulfonic acid, C 16 One or more of the above long-chain alkylbenzene sulfonic acids.

3. The multifunctional composite agent for deepwater oil and gas field umbilical cable injection according to claim 1, characterized in that: Water-soluble polyethers have a number-average molecular weight of 2000-6000 and a hydroxyl value ≤50mgKOH / g.

4. The multifunctional composite agent for deepwater oil and gas field umbilical cable injection according to claim 3, characterized in that: Water-soluble polyethers are prepared by grafting propylene oxide and ethylene oxide onto polyols under alkaline catalyst, vacuum, and 120–140 °C conditions for 8–10 h.

5. The multifunctional composite agent for deepwater oil and gas field umbilical cable injection according to claim 4, characterized in that: The polyols include ethylene glycol, propylene glycol, and glycerol.

6. The multifunctional composite agent for deepwater oil and gas field umbilical cable injection according to claim 4, characterized in that: The mass ratio of propylene oxide to ethylene oxide is 2:1 to 5:

1.

7. The multifunctional composite agent for deepwater oil and gas field umbilical cable injection according to claim 1, characterized in that: The organic amine is selected from one or more of the following: monoethanolamine, diethanolamine, triethanolamine, pyridine quaternary ammonium salt, oleic acid imidazoline, imidazoline quaternary ammonium salt, dodecyl dimethyl benzyl ammonium chloride, dodecyl trimethyl ammonium chloride, tetradecyl dimethyl benzyl ammonium chloride, hexadecyl trimethyl ammonium chloride, hexadecyl dimethyl benzyl ammonium chloride, and octadecyl dimethyl benzyl ammonium chloride.

8. The multifunctional composite agent for deepwater oil and gas field umbilical cable injection according to claim 1, characterized in that: The solvent may be one or more of methanol, ethanol, ethylene glycol, propylene glycol, and glycerol.

9. A method for preparing a multifunctional composite agent according to any one of claims 1-8, characterized in that: Includes the following steps: Mix the specified amounts of alkylbenzene sulfonic acid, water-soluble polyether, organic amine, solvent and water, control the reaction temperature at 40-60℃, stir for 30-60 minutes and discharge the material. The discharge material is filtered through a two-stage filtration and a circulating filtration process, and the cleanliness meets the requirements of NAS 8 standard to obtain a multifunctional composite agent.

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