CN112300770A

CN112300770A - Preparation method of temperature-resistant salt-resistant foam scrubbing agent

Info

Publication number: CN112300770A
Application number: CN202011020077.7A
Authority: CN
Inventors: 郑存川; 张太亮; 张旭; 李朝晖; 袁磊
Original assignee: Sichuan Kuineng Environmental Protection Technology Co ltd; Southwest Petroleum University
Current assignee: Sichuan Kuineng Environmental Protection Technology Co ltd; Southwest Petroleum University
Priority date: 2020-09-25
Filing date: 2020-09-25
Publication date: 2021-02-02
Anticipated expiration: 2040-09-25
Also published as: CN112300770B

Abstract

The invention discloses a preparation method of a temperature-resistant salt-resistant foam scrubbing agent, which comprises the following steps: adding fatty acid methyl ester sodium sulfonate into a three-neck flask, and heating and melting; introducing nitrogen to discharge oxygen, and then dropwise adding N, N-dimethyl-1, 3-propane diamine; then condensing and refluxing, and uniformly stirring to react to obtain a solid; recrystallizing the obtained solid with sodium chloride solution, filtering and drying to obtain the foam scrubbing agent. The synthetic foam scrubbing agent has the advantages of low raw material price, convenient source, simple synthetic operation, easy control and higher yield, and compared with the conventional foam scrubbing agent, the synthetic foam scrubbing agent has the advantages of low consumption, quick foam generation, large foam generation amount, fine and smooth foam, long foam stabilizing time, resource saving and cost reduction.

Description

Preparation method of temperature-resistant salt-resistant foam scrubbing agent

Technical Field

The invention relates to a preparation method of a temperature-resistant salt-resistant foam scrubbing agent, belonging to the field of oil and gas field chemistry.

Background

During the production of a gas well, the pressure of the gas reservoir and the flow rate of natural gas are gradually reduced, and formation water or hydrocarbon condensate in the gas reservoir often flows into the bottom of the well. When the gas well productivity is low and the liquid production capacity is large, the flow velocity of the fluid in the shaft is low, so that the produced liquid cannot be completely carried out of the shaft, and accumulated liquid is remained in the shaft. The liquid column pressure generated by the accumulated liquid can offset part of the formation pressure, and the liquid column pressure even reaches balance with the formation pressure under the condition of continuous operation, so that extra hydrostatic back pressure is caused to the gas reservoir, the production condition of the gas well is worsened, the yield of the gas well is reduced, and even the gas well is shut down due to flooding. In order to solve the problem, the most common method in the industry is a foam drainage gas production method, wherein the foam drainage gas production method is that a developed foam drainage agent (surfactant) and water are put into a shaft of a gas well according to a certain proportion, the foam drainage agent and accumulated liquid at the bottom of the well are uniformly mixed under the impact of natural gas flow at the bottom of the well to form a very fine foam flow, the foam drainage agent is carried to the ground by the aid of vertical lifting force of the natural gas flow, and finally, the accumulated liquid at the bottom of the well is discharged and the production of the gas well is recovered.

The foam-drainage agent is suitable for stratums with the temperature below 80 ℃ and gas wells with low condensate oil content, the foaming capacity and stability of the foam-drainage agent can be greatly reduced along with the increase of the environmental temperature and the increase of the condensate oil content, and especially in high-temperature stratums with the temperature above 100 ℃ and gas wells with the mineralization degree of 30 ten thousand, foams generated by a plurality of foaming agents can disappear within 1-2 min, and even no foams are generated. Therefore, in order to overcome the defects of the conventional foam scrubbing agent, the invention provides the foam scrubbing agent with high temperature resistance, high mineralization resistance and excellent foaming and foam stabilizing performance to meet the requirements of high-temperature deep gas wells.

Disclosure of Invention

In order to overcome the defect that the foaming and foam stabilizing performance of the foam discharging agent is poor along with the continuous increase of temperature and mineralization degree in the prior art, the invention provides a preparation method of a temperature-resistant salt-resistant foam discharging agent.

The technical scheme provided by the invention for solving the technical problems is as follows: a preparation method of a temperature-resistant salt-tolerant foam scrubbing agent comprises the following steps: adding fatty acid methyl ester sodium sulfonate into a three-neck flask, and heating and melting; introducing nitrogen to discharge oxygen, and then dropwise adding N, N-dimethyl-1, 3-propane diamine; then condensing and refluxing, and uniformly stirring to react to obtain a solid; recrystallizing the obtained solid with sodium chloride solution, filtering and drying to obtain the foam scrubbing agent.

The further technical scheme is that the mass ratio of the fatty acid methyl ester sodium sulfonate to the N, N-dimethyl-1, 3-propane diamine is 1:3 to 5.

The further technical scheme is that the reaction temperature of the fatty acid methyl ester sodium sulfonate and the N, N-dimethyl-1, 3-propane diamine is 180 ℃.

The further technical proposal is that the time of the condensation reflux is 18 h.

The further technical proposal is that the stirring speed is 1800 r/min.

The further technical scheme is that the mass fraction of the sodium chloride solution is 10%.

Compared with the prior art, the method has the following advantages:

(1) the synthetic foam discharging agent has the advantages of low raw material price, convenient source, simple synthetic operation, easy control and higher yield, and compared with the conventional foam discharging agent, the synthetic foam discharging agent has the advantages of low consumption, quick foam generation, large foam generation amount, fine and smooth foam and long foam stabilizing time, saves resources and reduces the cost;

(2) the synthesized chelating foam discharging agent contains groups such as sulfonic acid groups, ester groups, long chains and the like, has excellent foaming performance under the condition of high temperature and high mineralization degree, and has strong foam stability;

(3) through a foaming test and a foam half-life test, the foam discharging agent disclosed by the invention is compared with the related foam discharging agents on the market, the foam discharging agent has good foam performance and good stability, and the foam discharging agent prepared by the method disclosed by the invention has obvious advantages in actual use performance.

Detailed Description

The present invention will be further described with reference to the following examples.

Example 1

Adding sodium fatty acid Methyl Ester Sulfonate (MES) into a three-neck flask, heating and melting, introducing nitrogen to discharge oxygen, dropwise adding N, N-dimethyl-1, 3-propane diamine according to the mass ratio of 1:3, then condensing and refluxing, stirring uniformly at the rotating speed of 1800r/min, and reacting for 18 hours at 120 ℃ to obtain a solid; recrystallizing the obtained solid by using a sodium chloride solution with the mass fraction of 10%, filtering and drying to obtain the foam scrubbing agent of the embodiment 1.

Example 2

Adding sodium fatty acid Methyl Ester Sulfonate (MES) into a three-neck flask, heating and melting, introducing nitrogen to discharge oxygen, dropwise adding N, N-dimethyl-1, 3-propane diamine according to the mass ratio of 1:3.5, then condensing and refluxing, stirring uniformly at the rotating speed of 1800r/min, and reacting for 18 hours at 120 ℃ to obtain a solid; and recrystallizing the obtained solid by using a sodium chloride solution with the mass fraction of 10%, filtering and drying to obtain the foam scrubbing agent of the embodiment 2.

Example 3

Adding sodium fatty acid Methyl Ester Sulfonate (MES) into a three-neck flask, heating and melting, introducing nitrogen to discharge oxygen, dropwise adding N, N-dimethyl-1, 3-propane diamine according to the mass ratio of 1:4, then condensing and refluxing, stirring uniformly at the rotating speed of 1800r/min, and reacting for 18 hours at 120 ℃ to obtain a solid; and recrystallizing the obtained solid by using a sodium chloride solution with the mass fraction of 10%, filtering and drying to obtain the foam scrubbing agent of the embodiment 3.

Example 4

Adding sodium fatty acid Methyl Ester Sulfonate (MES) into a three-neck flask, heating and melting, introducing nitrogen to discharge oxygen, dropwise adding N, N-dimethyl-1, 3-propane diamine according to the mass ratio of 1:4.5, then condensing and refluxing, stirring uniformly at the rotating speed of 1800r/min, and reacting for 18 hours at 120 ℃ to obtain a solid; and recrystallizing the obtained solid by using a sodium chloride solution with the mass fraction of 10%, filtering and drying to obtain the foam scrubbing agent of the embodiment 4.

Example 5

Adding sodium fatty acid Methyl Ester Sulfonate (MES) into a three-neck flask, heating and melting, introducing nitrogen to discharge oxygen, dropwise adding N, N-dimethyl-1, 3-propane diamine according to the mass ratio of 1:5, then condensing and refluxing, stirring uniformly at the rotating speed of 1800r/min, and reacting for 18 hours at 120 ℃ to obtain a solid; and recrystallizing the obtained solid by using a sodium chloride solution with the mass fraction of 10%, filtering and drying to obtain the foam scrubbing agent of the embodiment 5.

Test examples

The foam discharging agents prepared in examples 1 to 5 were evaluated for foaming and foam stabilizing properties, and the evaluation criteria for the foam discharging agents were: initial bubble height, 3min foam height, liquid carrying capacity, foam half life.

A Rose-Miles foam instrument model 2151 was used. The experimental method comprises the following steps: respectively weighing the foam displacement agent prepared in the embodiment 1-5, placing the foam displacement agent into a beaker, adding 250mL of formation water, uniformly mixing, measuring 200mL of foam liquid by using a funnel of a Roche foam instrument, wetting and washing the Roche foam instrument by the rest 50mL of foam liquid (pouring left and right), placing a piston, dripping the foam liquid (dripping the foam liquid at the middle position of the liquid), starting timing when the dripping of the 200mL of foam liquid is finished, recording the initial foam height and the foam height of 3min, recording the time when the foam height is half of the initial foam height, opening an air compressor, adjusting the air flow rate to 5L/min, assembling the instrument, starting timing, weighing the volume of the liquid by using a measuring cylinder after 20min, and obtaining the test results shown in Table 1.

TABLE 1

In the above experiment, the foam discharging agent solution was aged at 120 ℃ for more than 10 hours, the mineralization degree of the used formation simulated water was 300g/L, and the addition amount of the foam discharging agent was 1.25 wt%.

The experimental results of the examples 1-5 in the table 1 show that the foam scrubbing agent prepared by the invention has good high-temperature and high-salt resistance.

Although the present invention has been described with reference to the above embodiments, it should be understood that the present invention is not limited to the above embodiments, and those skilled in the art can make various changes and modifications without departing from the scope of the present invention.

Claims

1. A preparation method of a temperature-resistant salt-tolerant foam discharging agent is characterized by comprising the following steps: adding fatty acid methyl ester sodium sulfonate into a three-neck flask, and heating and melting; introducing nitrogen to discharge oxygen, and then dropwise adding N, N-dimethyl-1, 3-propane diamine; then condensing and refluxing, and uniformly stirring to react to obtain a solid; recrystallizing the obtained solid with sodium chloride solution, filtering and drying to obtain the foam scrubbing agent.

2. The preparation method of the temperature-resistant salt-tolerant foam discharging agent according to claim 1, wherein the mass ratio of the fatty acid methyl ester sodium sulfonate to the N, N-dimethyl-1, 3-propane diamine is 1:3 to 5.

3. The method for preparing the temperature-resistant salt-tolerant foam discharging agent according to claim 1, wherein the reaction temperature of the sodium fatty acid methyl ester sulfonate and the N, N-dimethyl-1, 3-propane diamine is 180 ℃.

4. The preparation method of the temperature-resistant salt-tolerant foam discharging agent according to claim 1, wherein the time of condensation reflux is 18 h.

5. The method for preparing the temperature-resistant salt-tolerant foam discharging agent according to claim 1, wherein the stirring speed is 1800 r/min.

6. The preparation method of the temperature-resistant salt-tolerant foam discharging agent according to claim 1, wherein the mass fraction of the sodium chloride solution is 10%.