CN108690590B

CN108690590B - Gas well foam scrubbing agent and preparation method and application thereof

Info

Publication number: CN108690590B
Application number: CN201710219888.1A
Authority: CN
Inventors: 吴春芳; 沈之芹; 李应成; 何秀娟
Original assignee: China Petroleum and Chemical Corp; Sinopec Shanghai Research Institute of Petrochemical Technology
Current assignee: China Petroleum and Chemical Corp; Sinopec Shanghai Research Institute of Petrochemical Technology
Priority date: 2017-04-06
Filing date: 2017-04-06
Publication date: 2021-05-11
Anticipated expiration: 2037-04-06
Also published as: CN108690590A

Abstract

The invention relates to a temperature-resistant, salt-resistant and acid-resistant foam scrubbing agent suitable for a condensate gas well, a preparation method and application thereof, and mainly solves the technical problem of poor foam stability of the condensate gas well with high temperature, high salt, acidity and especially in the drainage and gas production process under the acidic condition in the prior art, and the foam scrubbing agent comprises the following components in parts by mass: (1) 0.01-1 part of an anionic surfactant; (2) 0.01-1 part of a zwitterionic surfactant; (3) the foam discharging agent has good foaming performance in high-temperature, high-salt, high-condensate oil and acidic formation water, long half life period and large liquid carrying amount, and can solve the problems of water drainage and gas production of high-temperature, high-salt, acidic and condensate gas wells. The raw materials are low in toxicity, low in irritation, low in price and easy to obtain, and can be used for industrial production of drainage and gas production of gas wells.

Description

Gas well foam scrubbing agent and preparation method and application thereof

Technical Field

The invention relates to a temperature-resistant, salt-resistant and acid-resistant gas well foam scrubbing agent suitable for condensate gas wells, and a preparation method and application thereof.

Background

In the development process of the natural gas well, due to the operation measures of edge water propulsion, water injection driving, fracturing and the like, water is continuously accumulated in a shaft, so that the gas production is reduced, and even the gas well is killed.

At present, common methods for removing accumulated liquid from natural gas wells in oil and gas fields at home and abroad include a foam drainage method, a liquid nitrogen method and the like. When a dead well is repaired, the liquid nitrogen method has a good effect, but the liquid nitrogen method needs a professional operation team and has high cost. The foam drainage method is a drainage gas production technology which is rapidly developed in recent years and is generally applied to gas production industries at home and abroad. The method utilizes the action of natural gas and foaming agent to form a continuously rising foam column, carries liquid and solid particles mixed in the liquid out of the well, and has the advantages of simple equipment, convenient construction, lower cost, high productivity, wide applicable well depth range, no influence on normal production of the gas well and the like.

The foam drainage works on the principle that a certain amount of surfactant (foaming agent) capable of foaming is injected into a gas well through a sleeve, so that accumulated liquid at the bottom of the well forms a large amount of low-density water-containing foam under the stirring of natural gas flow. As the bubble interface is created, the liquid is continuously lifted, bringing it to the surface. Meanwhile, the liquid at the bottom of the foam column is continuously supplemented until the well bottom water is completely replaced.

Currently, there are two main types of foaming agents used for foam drainage gas production: anionic surfactants and nonionic surfactants. For a high-temperature and high-salinity gas well, the anionic surfactant has poor compatibility with formation water and is easy to form precipitates with high-valence ions such as calcium, magnesium and the like in the formation water; the nonionic foaming agent has cloud point and poor temperature resistance, and when the stratum temperature is higher than the cloud point, the surfactant begins to be separated out from the water. The key problem of foam drainage gas production is to develop a foaming agent system which has strong foaming capacity, good stability, good compatibility with formation water, temperature resistance and salt tolerance.

The amphoteric ion surfactant has good temperature resistance, salt resistance and acid resistance due to the internal salt structure of the combination of yin and yang. The multiple active groups in the molecule enable the polyurethane foam to have high interfacial activity, good foaming performance and good foam stability. The invention develops a novel temperature-resistant, salt-resistant and acid-resistant foaming agent system by compounding a zwitterionic surfactant betaine and an anionic surfactant alkyl diaryl sulfonate.

However, the foaming capacity and stability of conventional foamers in condensate wells is greatly reduced. In a gas well with condensate oil content more than 10%, foam generated by a plurality of foaming agents disappears within 1-2 min, and even no foam is generated. The invention provides a temperature-resistant, salt-resistant and acid-resistant foam discharging agent, which greatly improves the stability of foam in a condensate gas well and solves the problems of water and gas production of the high-temperature, high-salt and acid condensate gas well.

Disclosure of Invention

One of the technical problems to be solved by the invention is the problem of poor foam stability of a high-temperature, high-salt, acidic and condensate gas well in the prior art, particularly in the drainage and gas recovery process under an acidic condition, and provides a temperature-resistant, salt-resistant and acid-resistant foam discharging agent, particularly an acid-resistant foam discharging agent, which is suitable for the condensate gas well, wherein the total mineralization of the foam discharging agent is 5000-250000 mg/L, and Ca is used for removing the acid from the condensate gas well²⁺、Mg²⁺The simulated water with the total content of 500-50000 mg/L, the pH value of 3-7 and the condensate oil content of 0-15 percent (wt) is clear and transparent, and has good foamability and long half-life period (namely good stability) at the temperature of 75 DEG CAnd large liquid carrying capacity.

The second technical problem to be solved by the present invention is to provide a preparation method of foam scrubbing agent corresponding to the first technical problem.

The invention aims to solve the third technical problem and provides an application of a foam discharging agent corresponding to the first technical problem in gas well water drainage and gas production.

In order to solve one of the above technical problems, the technical solution adopted by the present invention is as follows: a temperature-resistant, salt-resistant and acid-resistant gas well foam scrubbing agent suitable for condensate gas wells comprises the following components in parts by mass:

(1) 0.01-1 part of an anionic surfactant;

(2) 0.01-1 part of a zwitterionic surfactant;

(3) 0.01-0.5 part of foam stabilizer;

wherein the anionic surfactant has a molecular general formula shown in formula (I)

In the formula (I), R₁Is H or C₁～C₂₀The fatty group of (a); r₂Is H atom or C₁～C₂₀Alkyl groups of (a); a is O, S, - (CH)₂)_x-、-O-(CH₂CH₂O)_y-wherein x is any integer from 1 to 5 and y is any number from 1 to 5; m¹、M²Are all independently selected from at least one of alkali metal ions, alkaline earth metal ions, ammonium ions or hydrogen ions; m and n are the number of sulfonic acid groups, and the value range of m + n is any integer from 1 to 5; a. b is each M¹、M²When M is¹、M²When the ion is alkali metal ion, ammonium ion or hydrogen ion, a ═ M, b ═ n, when M is¹、M²When the ion is alkaline earth metal ion, a is m/2, and b is n/2;

the molecular general formula of the zwitterionic surfactant (II) is as follows:

r in the formula (II)₃Is C₁～C₁₅Fatty radical of (C)₃～C₁₈Fatty amide group and/or R₇O-(CH₂-CH₂-O)_zAt least one of (A) to (B), R₇Is C₁～C₅Z is any number of 1-10; r₄、R₅Is independently selected from C₁～C₁₀Alkyl or substituted alkyl of (a); r₆Is C₁～C₄One of alkylene groups of (a); b is selected from anionic groups which render the molecule of formula (II) electrically neutral; c is any integer of 1-5.

In the above technical scheme, R₁Preferably C₁～C₂₀Is more preferably C₄～C₁₅More preferably C₈～C₁₅Most preferably C₈～C₁₂Alkyl group of (1).

In the above technical scheme, R₂Preferably H atom or C₄～C₁₅Further preferably C₈～C₁₅Alkyl group of (1).

In the technical scheme, x is preferably any integer of 1-3; y is preferably any one number of 1-3; the independent values of m and n are preferably any integer of m + n ═ 1-3.

In the above technical scheme, R₃Preferably C₈～C₁₈Fatty amide group of (e.g. C)₈～C₁₈Alkylamide group of (A), C₈～C₁₈Alkenyl amide group of (A), C)₆～C₁₅Alkyl of R₇O-(CH₂-CH₂-O)_zWherein R is₇Preferably C₅～C₁₅More preferably C₅～C₁₅Z is preferably any one number of 3 to 10; c is preferably 1 to 4Any integer of (1) to (3) is more preferable; r₄、R₅Independently is preferably C₁～C₃Further preferably a methyl group; r₆Is preferably-CH₂-or-CH₂-CH₂-; b is preferably COO^-Or SO₃ ^-(ii) a More preferably COO^-。

In the above technical solution, as one of preferable solutions: the M is¹And M²Independently selected from any one of alkali metal ions or alkaline earth metal ions, R₁Is C₄～C₁₅Alkyl of R₂Is H atom or C₄～C₁₅A is O atom or S atom, and m and n independently take the value of m + n which is any integer of 1-3.

In the above technical solution, as a second preferable solution: the M is¹And M²Independently selected from ammonium ions or hydrogen atoms, R₁Is C₈～C₁₅Alkyl of R₂Is C₈～C₁₅A is O atom or S atom, and m and n independently take the value of m + n which is any integer of 1-3.

In the above technical solution, as a third preferable solution: the M is¹And M²Is independently selected from any one metal ion of alkali metal or alkaline earth metal, R₁Is C₈～C₁₅Alkyl of R₂Is C₈～C₁₅Alkyl of (A) is- (CH)₂)_x-or-O- (CH)₂CH₂O)_y-, wherein is any one integer of 1 to 3, and y is any one number of 1 to 3.

In the above technical solution, the foam stabilizer is preferably one or a mixture of more than two of carboxymethyl cellulose, polyacrylamide, diethanolamine or triethanolamine; the polyacrylamide can be various polyacrylamide polymers commonly used in the field of oil extraction in oil fields, including polyacrylamide homopolymer, copolymer and the like, and can be anionic or cationic.

In the above technical scheme, M¹And M²Independently of one another, preferablyAlkali metal ions, more preferably sodium or potassium; a is preferably O atom or-O- (CH)₂CH₂O)_y-, y is 1 to 3; preferably m + n is 1 or 2; r₇Preferably selected from C₅～C₁₀Z is 3-8; the polyacrylamide is preferably copolymerized by acrylamide and temperature-resistant and salt-resistant monomers, and the molar ratio of the two monomers is preferably (1-30): 1, more preferably (5-20): 1. The preferable scheme of the temperature-resistant and salt-resistant monomer is N-alkyl acrylamide or acrylamide alkyl sulfonic acid.

In the technical scheme, the gas well foam discharging agent preferably comprises 97.5-100 parts of water by mass, wherein the water can be fresh water, salt water, oilfield produced water and stratum simulation water; the total mineralization degree of the water is preferably 10000-200000 mg/L, more preferably 20000-180000 mg/L, and Ca²⁺+Mg²⁺The preferable scheme is 500-40000 mg/L, and the more preferable scheme is 1000-25000 mg/L.

In order to solve the second technical problem, the invention adopts the technical scheme that: the preparation method of the gas well foam scrubbing agent in any one of the technical schemes comprises the following steps:

and uniformly mixing the required amount of anionic surfactant, zwitterionic surfactant and foam stabilizer to obtain the foam scrubbing agent.

In the technical scheme, the required amount of the anionic surfactant, the zwitterionic surfactant, the foam stabilizer and the water are preferably uniformly mixed to obtain the foam discharging agent; more preferably, the following preparation method: : mixing the required amount of anionic surfactant, zwitterionic surfactant, foam stabilizer and water, and stirring at the rotating speed of 150rpm for 20-60 minutes at room temperature to obtain the required foam discharging agent. The proportion of the anionic surfactant, the zwitterionic surfactant, the foam stabilizer and the simulated water is 0.01-1 part by mass, 0.01-0.5 part by mass and 97.5-99.7 parts by mass. The preferable range of the using amount of the anionic surfactant is 0.01-0.5 part, the preferable range of the using amount of the zwitterionic surfactant is 0.01-0.5 part, the preferable range of the using amount of the foam stabilizer is 0.01-0.3 part, and the preferable stirring time is 30-40 minutes.

In order to solve the third technical problem, the invention adopts the technical scheme that: the application of the gas well foam scrubbing agent in any one of the technical schemes in gas well drainage and gas production.

In the above technical solution, the application is not particularly limited, and a person skilled in the art can apply the foam scrubbing agent according to the existing gas well drainage and gas production process, for example, but not limited, the foam scrubbing agent of the present invention can be applied to a gas well with a temperature of not higher than 200 ℃, a mineralization degree of less than 250000mg/L, a calcium and magnesium ion concentration of less than 50000mg/L, a pH of 3-7, and a condensate content of not more than 15%. The foam discharging agent can be mixed with air, nitrogen, carbon dioxide and natural gas to form stable foam.

The anionic surfactant and the zwitterionic surfactant are compounded to generate a synergistic effect, so that a foaming agent with strong foaming performance, good foam stabilizing performance, temperature resistance, salt resistance and acid resistance is obtained, and after a certain amount of foam stabilizer is added, the three agents are synergistic to resist the interference of condensate oil. The foam scrubbing agent disclosed by the invention can be suitable for a gas well with the temperature not higher than 200 ℃, the mineralization degree lower than 250000mg/L, the concentration of calcium and magnesium ions lower than 50000mg/L, the pH value between 3 and 7 and the condensate oil content less than or equal to 15%. The foam scrubbing agent is mixed with air, nitrogen, carbon dioxide and natural gas to form stable foam, and is applied to indoor tests of formation water foam systems of oil wells and gas wells in southwest China. A foam scanning analyzer (FOAMSCAN) detects that the foaming time of the foam discharging agent in simulated formation water of a southwest oilfield containing 10% condensate oil at 75 ℃ is less than 75s (reaching 200mL of foam volume), the foam liquid carrying rate is more than 50%, the foam half-life period is more than 400s, and the liquid carrying half-life period is more than 60 s. After the foam scrubbing agent is aged for 15 days at the temperature of 150 ℃, the foaming capacity, the foam stability and the liquid carrying capacity of the foam scrubbing agent are not obviously reduced; the invention is further surprising in that, especially when condensate oil is contained under acidic conditions, the liquid carrying half-life is more than 60% higher than that of the foam-discharging agent containing anionic surfactant and zwitterionic surfactant in the prior art.

By adopting the technical scheme of the invention, the foaming time in simulated formation water of the southwest oilfield containing 10% condensate oil at 75 ℃ is less than 75s (up to 200mL of foam volume), the foam liquid carrying rate is more than 50%, the foam half-life period is more than 400s, and the liquid carrying half-life period is more than 60s, so that a better technical effect is achieved.

The present invention will be further illustrated by the following specific examples.

Detailed Description

The present invention is further described with reference to specific examples in order to better understand the invention and to better demonstrate the beneficial effects of the invention. The foam evaluation method adopted in the experimental process is a conductivity method, and the used instrument is a foam scanning analyzer. In the experiment, 60mL of test solution is injected into the sample cell by using a sample injector, and then the host computer and the test software of the foam scanning analyzer are opened. And introducing nitrogen for bubbling, wherein the gas flow rate is 100mL/min, and the bubbling is automatically stopped when the foam volume reaches 200 mL. Evaluating the foaming capacity of the foam discharging agent by the foaming time of reaching 200mL of foam volume; evaluating the liquid discharge capacity of the foam discharging agent according to the foam liquid carrying capacity; foam stability was evaluated as foam half-life and liquid carrying half-life.

[ example 1 ]

Taking 0.06 wt% of sodium dodecyl diphenyl ether sulfonate (R) according to mass percentage₁、R₂＝C₁₂；A＝O；M₁、M₂＝Na⁺) 0.14 wt% Cocamidopropyl betaine (R)₃＝R’CONH-；R’＝C₈～C₁₈，R₄、R₅＝CH₃，R₆＝-CH₂-, B is COO^-C-3) and a certain amount of anionic polyacrylamide X (wt%) are dissolved in the oil field formation simulation water 1 in southwest and stirred for 30 minutes to obtain the required foam scrubbing agent. The ion content of the southwest oilfield formation simulated water 1 is shown in table 1. The foaming time, liquid carrying capacity, foam half-life and liquid carrying half-life of the foam discharging agent were measured by a foam scanning analyzer (FOAMSCAN) under a water bath condition of 75 deg.C, and the results are shown in Table 2.

TABLE 1

Name (R)	Na⁺	Mg²⁺	Ca²⁺	Cl^-	Total degree of mineralization	pH value
							Content (mg/L)	8109	50	926	13915	23000	4.5

TABLE 2

[ example 2 ]

The foam discharging agent in [ example 1 ] was put into a pressure bomb, put into an oven, aged at 150 ℃ for 15 days and taken out, and the foam discharging agent was measured for foaming time, liquid carrying amount, foam half-life period and liquid carrying half-life period by a foam scanning analyzer (FOAMSCAN) under a water bath condition of 75 ℃, and the results are shown in table 3.

TABLE 3

[ example 3 ]

Taking 0.02 wt% of sodium dodecyl diphenyl ether sulfonate (R) in percentage by mass₁、R₂＝C₁₂(ii) a A is O; m₁、M₂Is Na⁺) 0.18 wt% of cocamidopropyl betaine and a certain amount of anionic polyacrylamide are dissolved in the simulated water 2 of the oil field stratum in southwest, and the mixture is stirred for 30 minutes to obtain the required foam-discharging agent. The ion content of the southwest oilfield formation simulated water 2 is shown in table 4. The foaming time, liquid carrying capacity, foam half-life and liquid carrying half-life of the foam discharging agent were measured by a foam scanning analyzer (FOAMSCAN) under a water bath condition of 75 ℃, and the results are shown in table 5.

TABLE 4

Name (R)	Na⁺	Mg²⁺	Ca²⁺	Cl^-	Total degree of mineralization	pH value
							Content (mg/L)	58310	500	3500	97690	160000	3.6

TABLE 5

[ COMPARATIVE EXAMPLE 1 ]

Taking 0.02 wt% of Sodium Dodecyl Benzene Sulfonate (SDBS), 0.18% of cocamidopropyl betaine and a certain amount of anionic polyacrylamide according to mass percentage, dissolving in southwest oilfield formation simulated water 2, and stirring for 30 minutes to obtain the required foam scrubbing agent. The foaming time, liquid carrying capacity, foam half-life and liquid carrying half-life of the foam discharging agent were measured by a foam scanning analyzer (FOAMSCAN) under a water bath condition of 75 deg.c, and the results are shown in table 6.

TABLE 6

[ COMPARATIVE EXAMPLE 2 ]

According to the mass percentage, 0.02 wt% of alpha-olefin sulfonate (AOS), 0.18% of cocamidopropyl betaine and a certain amount of anionic polyacrylamide are dissolved in simulated water 2 of an oil field formation in southwest, and the required foam scrubbing agent is obtained after stirring for 30 minutes. The foaming time, liquid carrying capacity, foam half-life and liquid carrying half-life of the foam discharging agent were measured by a foam scanning analyzer (FOAMSCAN) under a water bath condition of 75 deg.c, and the results are shown in table 7.

TABLE 7

[ COMPARATIVE EXAMPLE 3 ]

According to the mass percentage, 0.02 wt% of petroleum sulfonate, 0.18% of cocamidopropyl betaine and a certain amount of anionic polyacrylamide are dissolved in simulated water 2 of a southwest oilfield stratum, and the required foam scrubbing agent is obtained after stirring for 30 minutes. The foaming time, liquid carrying capacity, foam half-life and liquid carrying half-life of the foam discharging agent were measured by a foam scanning analyzer (FOAMSCAN) under a water bath condition of 75 ℃ and the results are shown in Table 8.

TABLE 8

[ example 4 ]

The foam discharging agent in [ example 3 ] was charged into a pressure bomb, put into an oven, aged at 150 ℃ for 15 days and taken out, and the foam discharging agent was measured for foaming time, liquid carrying amount, foam half-life period and liquid carrying half-life period by a foam scanning analyzer (FOAMSCAN) under a water bath condition of 75 ℃, and the results are shown in table 9.

TABLE 9

[ example 5 ]

Taking 0.09 wt% of sodium monododecyl diphenyl ether sulfonate (R) in percentage by mass₁＝C₁₂；R₂＝H；A＝O；M₁、M₂＝Na⁺) 0.11 wt% of octadecyl dimethyl betaine (R)₃＝C₁₅，c＝3，R₄、R₅＝CH₃，R₆＝-CH₂-, B is COO^-) And a certain amount of carboxymethyl cellulose is dissolved in the simulated water of the oil field stratum in southwest 1, and the mixture is stirred for 30 minutes to obtain the required foam discharging agent. The foaming time, liquid carrying amount, foam half-life and liquid carrying half-life of the foam discharging agent were measured by a foam scanning analyzer (FOAMSCAN) under a water bath condition of 75 ℃ and the results are shown in Table 10.

Watch 10

[ example 6 ]

The foam discharging agent in [ example 5 ] was charged into a pressure bomb, put into an oven, aged at 150 ℃ for 15 days and taken out, and the foam discharging agent was measured for foaming time, liquid carrying amount, foam half-life period and liquid carrying half-life period by a foam scanning analyzer (FOAMSCAN) under a water bath condition of 75 ℃, and the results are shown in table 11.

TABLE 11

[ example 7 ]

Taking 0.03 weight percent of sodium dodecyl diphenyl ether sulfonate (R) by mass percent₁＝C₁₂；R₂＝H；A＝O；M₁、M₂＝Na⁺) 0.17 wt% of octadecyl dimethyl betaine and a certain amount of carboxymethyl cellulose are dissolved in simulated water 2 of the oil field stratum in southwest, and the required foam-discharging agent is obtained after stirring for 30 minutes. The foaming time, liquid carrying capacity, foam half-life and liquid carrying half-life of the foam discharging agent were measured by a foam scanning analyzer (FOAMSCAN) under a water bath condition of 75 deg.c, and the results are shown in table 12.

TABLE 12

[ example 8 ]

The foam discharging agent in [ example 7 ] was charged into a pressure bomb, put into an oven, aged at 150 ℃ for 15 days and taken out, and the foam discharging agent was measured for foaming time, liquid carrying amount, foam half-life period and liquid carrying half-life period by a foam scanning analyzer (FOAMSCAN) under a water bath condition of 75 ℃ as shown in table 13.

Watch 13

[ example 9 ]

Taking 0.09wt percent of sodium dodecyl diphenyl sulfide (R) by mass percent₁、R₂＝C₁₂；A＝S；M₁、M₂＝Na⁺) 0.11% by weight of octyl alcohol polyoxyethylene ether propyl betaine (R)₃＝R₇O-(CH₂-CH₂-O)_z-，R₇＝C₈，z＝5，c＝2，R₄、R₅＝CH₃，R₆＝-CH₂-, B is SO₃ ^-) And anionic polyacrylamide and diethanol amine are dissolved in the simulated water of the oil field stratum in southwest 1, and the mixture is stirred for 30 minutes to obtain the required foam scrubbing agent. The foaming time, liquid carrying capacity, foam half-life and liquid carrying half-life of the foam discharging agent were measured by a foam scanning analyzer (FOAMSCAN) under a water bath condition of 75 ℃ and the results are shown in Table 14.

TABLE 14

[ example 10 ]

The foam discharging agent in [ example 9 ] was charged into a pressure bomb, put into an oven, aged at 150 ℃ for 15 days and taken out, and the foam discharging agent was measured for foaming time, liquid carrying amount, foam half-life period and liquid carrying half-life period by a foam scanning analyzer (FOAMSCAN) under a water bath condition of 75 ℃ as shown in table 15.

Watch 15

[ example 11 ]

Taking 0.04 wt% of sodium dodecyl diphenyl sulfide (R) in percentage by mass₁、R₂＝C₁₂；A＝S；M₁、M₂＝Na⁺) 0.11% by weight of octyl alcohol polyoxyethylene ether propyl betaine (R)₃＝R₇O-(CH₂-CH₂-O)_z-，R₇＝C₈，z＝5)And anionic polyacrylamide and diethanol amine are dissolved in the simulated water 2 of the oil field stratum in southwest, and the mixture is stirred for 30 minutes to obtain the required foam scrubbing agent. The foaming time, liquid carrying capacity, foam half-life and liquid carrying half-life of the foam discharging agent were measured by a foam scanning analyzer (FOAMSCAN) under a water bath condition of 75 ℃ and the results are shown in Table 16.

TABLE 16

[ example 12 ]

The foam discharging agent in [ example 11 ] was charged into a pressure bomb, put into an oven, aged at 150 ℃ for 15 days and taken out, and the foam discharging agent was measured for foaming time, liquid carrying amount, foam half-life period and liquid carrying half-life period by a foam scanning analyzer (FOAMSCAN) under a water bath condition of 75 ℃ as shown in table 17.

TABLE 17

[ example 13 ]

Taking 0.06 wt% of sodium nonyl diphenyl phenol polyoxyethylene ether sulfonate (R) in percentage by mass₁、R₂＝C₉；A＝-O-(CH₂-CH₂O)_y-，y＝2；M₁、M₂＝Na⁺) 0.09 wt% of lauramide propyl betaine and a certain amount of triethanolamine are dissolved in the simulated water 1 of the oil field stratum in southwest province, and the required foam scrubbing agent is obtained after stirring for 30 minutes. The foaming time, liquid carrying capacity, foam half-life and liquid carrying half-life of the foam discharging agent were measured by a foam scanning analyzer (FOAMSCAN) under a water bath condition of 75 ℃ and the results are shown in Table 18.

Watch 18

[ example 14 ]

The foam discharging agent in [ example 13 ] was charged into a pressure bomb, put into an oven, aged at 150 ℃ for 15 days and taken out, and the foam discharging agent was measured for foaming time, liquid carrying amount, foam half-life period and liquid carrying half-life period by a foam scanning analyzer (FOAMSCAN) under a water bath condition of 75 ℃ as shown in table 19.

Watch 19

[ example 15 ]

Taking 0.06 wt% of sodium nonyl diphenyl phenol polyoxyethylene ether sulfonate (R) in percentage by mass₁、R₂＝C₉；A＝-O-(CH₂-CH₂O)_y-，y＝2；M₁、M₂＝Na⁺) 0.09 wt% of lauramide propyl betaine and a certain amount of triethanolamine are dissolved in the simulated water 2 of the oil field stratum in southwest province, and the required foam scrubbing agent is obtained after stirring for 30 minutes. The foaming time, liquid carrying capacity, foam half-life and liquid carrying half-life of the foam discharging agent were measured by a foam scanning analyzer (FOAMSCAN) under a water bath condition of 75 ℃ and the results are shown in Table 20.

Watch 20

[ COMPARATIVE EXAMPLE 4 ]

According to the mass percentage, 0.06 wt% of sodium fatty alcohol-polyoxyethylene ether sulfonate, 0.09 wt% of lauramidopropyl betaine and a certain amount of triethanolamine are dissolved in the formation simulated water 2 of the oil field in southwest, and the required foam discharging agent is obtained after stirring for 30 minutes. The foaming time, liquid carrying capacity, foam half-life and liquid carrying half-life of the foam discharging agent were measured by a foam scanning analyzer (FOAMSCAN) under a water bath condition of 75 ℃ and the results are shown in Table 21.

TABLE 21

[ example 16 ]

The foam discharging agent in [ example 15 ] was charged into a pressure bomb, put into an oven, aged at 150 ℃ for 15 days and taken out, and the foam discharging agent was measured for foaming time, liquid carrying amount, foam half-life period and liquid carrying half-life period by a foam scanning analyzer (FOAMSCAN) under a water bath condition of 75 ℃ as shown in table 22.

TABLE 22

Claims

1. The gas well foam scrubbing agent comprises the following components in parts by weight:

(1) 0.01-1 part of an anionic surfactant;

(2) 0.01-1 part of a zwitterionic surfactant;

(3) 0.01-0.5 part of foam stabilizer;

wherein the anionic surfactant has a general molecular formula shown in formula (I):

in the formula (I), R₁Is H or C₁～C₂₀The fatty group of (a); r₂Is H or C₁～C₂₀Alkyl groups of (a); a is O, S, - (CH)₂)_x-、-O-(CH₂CH₂O)_y-wherein x is any integer from 1 to 5 and y is any number from 1 to 5; m¹、M²Are independently selected from at least one of alkali metal ions and alkaline earth metal ions; m and n are the number of sulfonic acid groups, and the value range of m + n is any integer from 1 to 5; a. b is each M¹、M²When M is¹、M²When the metal ion is an alkali metal ion, a is M, b is n, and when M is M¹、M²When it is an alkaline earth metal ion, a is m/2，b＝n/2；

The zwitterionic surfactant has a general molecular formula shown in formula (II):

in the formula (II), R₃Is C₁～C₁₅Fatty group of (C)₃～C₁₈Fatty amide group and/or R₇O-(CH₂-CH₂-O)_zAt least one of (A) to (B), R₇Is C₁～C₁₅Z is 1-10; r₄、R₅Is independently selected from C₁～C₁₀Alkyl or substituted alkyl of (a); r₆Is C₁～C₄One of alkylene groups of (a); b is^-Selected from anionic groups which render the molecule of formula (II) electrically neutral; c is any integer of 1-5;

the foam stabilizer is one or a mixture of more than two of carboxymethyl cellulose, polyacrylamide polymer, diethanolamine and triethanolamine.

2. Gas well foam-drainage agent as claimed in claim 1, characterized in that M¹And M²Independently selected from any one of alkali metal ions or alkaline earth metal ions, R₁Is C₄～C₁₅Alkyl of (a), said R₂Is H atom or C₄～C₁₅The A is an O atom or an S atom, and m and n are independently any integer of 1-3.

3. Gas well foam-drainage agent as claimed in claim 1, characterized in that M¹And M²Independently selected from any one of alkali metal ions or alkaline earth metal ions, and R is₁Is C₈～C₁₅Alkyl of (a), said R₂Is C₈～C₁₅Said A is- (CH)₂)_x-or-O- (CH)₂CH₂O)_y-, whichWherein x is any integer from 1 to 3, and y is any number from 1 to 3.

4. The gas well foam-bleed agent as set forth in claim 1, wherein R is₃Is C₈～C₁₈Fatty acid amide group of (C)₆～C₁₅Alkyl of R₇O-(CH₂-CH₂-O)_zWherein R is₇Is selected from C₅～C₁₅Z is any number of 3-10; c is any integer from 1 to 4; the R is₄、R₅Is C₁～C₃Alkyl groups of (a); the R is₆is-CH₂-or-CH₂-CH₂-; b is^-Is COO^-Or SO₃ ^-。

5. The gas well foam discharging agent as recited in claim 1, characterized in that c is any integer from 1 to 3.

6. The gas well foam drainage agent as claimed in claim 1, characterized by further comprising 97.5-100 parts by mass of water; the total mineralization of the water is 5000-250000 mg/L, Ca²⁺+Mg²⁺The concentration is 500-50000 mg/L, and the pH is 3-7.

7. A method for preparing the gas well foam scrubbing agent as set forth in any one of claims 1 to 6, comprising the steps of: and uniformly mixing the required amount of anionic surfactant, zwitterionic surfactant and foam stabilizer to obtain the gas well foam discharging agent.

8. The application of the gas well foam discharging agent as set forth in any one of claims 1-6 in gas well drainage and gas production.