CN117925214B - High condensate oil resistant antifreezing foam discharging agent and preparation method and application thereof - Google Patents
High condensate oil resistant antifreezing foam discharging agent and preparation method and application thereof Download PDFInfo
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- 239000006260 foam Substances 0.000 title claims abstract description 109
- 238000007599 discharging Methods 0.000 title claims abstract description 70
- 238000002360 preparation method Methods 0.000 title abstract description 11
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 87
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 38
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 claims abstract description 33
- 239000004094 surface-active agent Substances 0.000 claims abstract description 33
- 238000007710 freezing Methods 0.000 claims abstract description 25
- 239000002994 raw material Substances 0.000 claims abstract description 20
- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical compound OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 claims abstract description 19
- 229940043237 diethanolamine Drugs 0.000 claims abstract description 19
- JNGWKQJZIUZUPR-UHFFFAOYSA-N [3-(dodecanoylamino)propyl](hydroxy)dimethylammonium Chemical compound CCCCCCCCCCCC(=O)NCCC[N+](C)(C)[O-] JNGWKQJZIUZUPR-UHFFFAOYSA-N 0.000 claims abstract description 17
- 229940026210 lauramidopropylamine oxide Drugs 0.000 claims abstract description 17
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 33
- LYCAIKOWRPUZTN-UHFFFAOYSA-N ethylene glycol Natural products OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 23
- 239000007789 gas Substances 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 11
- 238000004519 manufacturing process Methods 0.000 claims description 10
- 239000013051 drainage agent Substances 0.000 claims description 8
- 230000002528 anti-freeze Effects 0.000 claims description 6
- 230000008014 freezing Effects 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- 238000005303 weighing Methods 0.000 claims description 5
- ILRSCQWREDREME-UHFFFAOYSA-N dodecanamide Chemical compound CCCCCCCCCCCC(N)=O ILRSCQWREDREME-UHFFFAOYSA-N 0.000 claims description 4
- WGYKZJWCGVVSQN-UHFFFAOYSA-N propylamine Chemical compound CCCN WGYKZJWCGVVSQN-UHFFFAOYSA-N 0.000 claims description 4
- 125000003827 glycol group Chemical group 0.000 claims description 2
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 claims description 2
- 229940116335 lauramide Drugs 0.000 claims description 2
- 239000002343 natural gas well Substances 0.000 claims description 2
- 239000007788 liquid Substances 0.000 abstract description 43
- 238000005187 foaming Methods 0.000 abstract description 10
- 230000033558 biomineral tissue development Effects 0.000 abstract description 7
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 230000015572 biosynthetic process Effects 0.000 abstract description 2
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 239000012530 fluid Substances 0.000 abstract description 2
- 239000000243 solution Substances 0.000 description 15
- 238000010438 heat treatment Methods 0.000 description 7
- 238000012360 testing method Methods 0.000 description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 239000011550 stock solution Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 125000002091 cationic group Chemical group 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 239000003755 preservative agent Substances 0.000 description 2
- 230000002335 preservative effect Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 108010053481 Antifreeze Proteins Proteins 0.000 description 1
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003599 detergent Substances 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000004088 foaming agent Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 229910001629 magnesium chloride Inorganic materials 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002120 nanofilm Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/584—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of specific surfactants
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- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
- Emulsifying, Dispersing, Foam-Producing Or Wetting Agents (AREA)
Abstract
The invention discloses an anti-freezing foam discharging agent for resisting high condensate oil, and a preparation method and application thereof, and belongs to the technical field of foam discharging agent preparation. The high condensate oil resistant antifreezing foam discharging agent comprises the following raw materials in percentage by mass: 15-30% of cocoyl diethanol amine, 20-30% of lauramidopropyl amine oxide, 30-50% of antifreezing agent, 0.5-1% of fluorocarbon surfactant and the balance of water. The maximum surface tension of the condensate oil foam discharging agent prepared by the invention is 27.88mN/m, the liquid carrying rate of the condensate oil foam discharging agent can be up to 84% in the range of 20-50% of condensate oil content, the condensate oil can be up to 50%, the mineralization resistance is up to 2X 10 5 mg/L, the foaming performance is stable, the foam liquid carrying amount is large, no chemical reaction occurs with formation fluid, and the compatibility is good; and the water does not solidify and freeze at the temperature of minus 30 ℃, thereby being beneficial to the large-scale application of the on-site gas well.
Description
Technical Field
The invention belongs to the technical field of preparation of foam discharging agents, and particularly relates to an anti-freezing foam discharging agent for resisting high condensate oil, a preparation method and application thereof.
Background
Along with the gradual entering of gas field development into middle and later-stage stratum gas reservoirs, the natural gas flow speed is reduced, hydrocarbon condensate or stratum water stays at the bottom of a well, so that the accumulated liquid in a well is serious due to poor liquid carrying capacity of the well, and the natural gas yield is reduced or even the production is stopped due to flooding. The foam drainage process is one of the most common drainage and production processes, is widely applied to drainage and production of gas wells, can effectively utilize gas agitation to generate foam, and carries shaft effusion to the ground, so that normal production of the gas wells is ensured, and therefore, the foam drainage process has remarkable effects in improving shaft bottom effusion, improving gas well productivity and prolonging gas well production period.
Most gas wells in China are oil, gas and water symbiotic, the accumulated liquid in the well has a certain mineralization degree, condensate oil is also contained in the accumulated liquid, and the bottom hole temperature is generally above 90 ℃. At present, the types of foam discharging agents are not few, but most of the foam discharging agents are single-performance foam discharging agents, which have defects in working performance, and along with the occurrence of various special conditions in the middle and later periods of gas field development, the foam discharging agents are required to have multiple functions, and good foam performance can be achieved under the conditions of high mineralization degree and high condensate oil content. In addition, when the foam discharging agent is used in severe cold winter, the problem that the foam discharging agent is frozen or solidified exists, and when the foam discharging agent is severe, the foam discharging agent cannot be used in winter, so that the production of oil fields and gas fields is seriously affected.
Disclosure of Invention
The invention aims to solve the technical problems that: the anti-freezing type foam discharging agent for the high condensate oil and the preparation method and the application thereof are provided, so that the technical problems that the existing foam discharging agent is single in function, insufficient in anti-freezing oil-separating capability and easy to freeze or solidify at low temperature are solved.
In order to achieve the above purpose, the invention adopts the following technical scheme: the anti-freezing foam discharging agent for the high condensate oil is provided, and the raw materials comprise the following components in percentage by mass: 15-30% of cocoyl diethanol amine, 20-30% of lauramidopropyl amine oxide, 30-50% of antifreezing agent, 0.5-1% of fluorocarbon surfactant and the balance of water; the antifreezing agent is glycol and/or glycerol.
Ethylene glycol and glycerol are antifreeze components, so that the foam discharging agent can keep good fluidity at low temperature.
Based on the technical scheme, the invention can also be improved as follows:
Further, the raw materials comprise the following components in percentage by mass: 15% of cocoyl diethanol amine, 20% of lauramidopropyl amine oxide, 50% of antifreezing agent, 1% of fluorocarbon surfactant and the balance of water.
Further, the raw materials comprise the following components in percentage by mass: 30% of cocoyl diethanol amine, 30% of lauramide propyl amine oxide, 30% of antifreezing agent, 0.5% of fluorocarbon surfactant and the balance of water.
Further, the raw materials comprise the following components in percentage by mass: 25% of cocoyl diethanol amine, 25% of lauramidopropyl amine oxide, 45% of antifreezing agent, 0.8% of fluorocarbon surfactant and the balance of water.
Further, the fluorocarbon surfactant is a cationic fluorocarbon surfactant.
Further, the cationic fluorocarbon surfactant is INTECHEM-03 fluorocarbon surfactant or INTECHEM-08 fluorocarbon surfactant.
The fluorocarbon surfactant is a foam assisting component, and can be directionally aggregated at a liquid-gas interface and arranged into a fluorocarbon chain molecular film, and the fluorocarbon surfactant can be stably present on the surface of foam due to lower energy at the liquid-gas interface, so that the surface tension is reduced.
The invention also discloses a preparation method of the high condensate oil anti-freezing foam discharging agent, which comprises the following steps: firstly weighing raw materials according to a proportion, uniformly mixing cocoyl diethanol amine, lauramidopropyl amine oxide and fluorocarbon surfactant, then adding an antifreezing agent and water, and finally stirring for 0.5-1h at 40-50 ℃ to prepare the antifreezing foam discharging agent for resisting high condensate oil.
The invention also discloses application of the high condensate oil resistance antifreezing foam discharging agent in drainage and gas production of the natural gas well.
The beneficial effects of the invention are as follows: the maximum surface tension of the condensate oil foam discharging agent prepared by the invention is 27.88mN/m, the liquid carrying rate of the condensate oil foam discharging agent can be up to 84% in the range of 20-50% of condensate oil content, the condensate oil can be up to 50%, the mineralization resistance is up to 2X 10 5 mg/L, the foaming performance is stable, the foam liquid carrying amount is large, no chemical reaction occurs with formation fluid, and the compatibility is good; and the water and gas well can not be frozen at the temperature of minus 30 ℃, can be developed efficiently, continuously, stably and uniformly in an extreme environment, and is beneficial to the large-scale application of a field gas well.
Detailed Description
The following description of the specific embodiments of the present invention is provided to facilitate understanding of the present invention by those skilled in the art, and the examples are not intended to be limiting, and the reagents or apparatus used are not intended to be limiting, and are conventional products available for commercial purchase. It should be understood that the invention is not limited to the specific embodiments, but is capable of numerous modifications within the spirit and scope of the invention as hereinafter defined and defined by the appended claims as will be apparent to those skilled in the art all falling within the true spirit and scope of the invention as hereinafter claimed.
Example 1
The anti-freezing foam drainage agent for the high condensate oil comprises the following raw materials in percentage by mass: 15% of cocoyl diethanol amine, 20% of lauramidopropyl amine oxide, 25% of ethylene glycol, 25% of glycerol, 1% of INTECHEM-08 (FC-8) fluorocarbon surfactant and the balance of water.
The preparation method of the high condensate oil anti-freezing foam discharging agent comprises the following steps: firstly weighing raw materials according to a proportion, uniformly mixing cocoyl diethanol amine, lauramidopropyl amine oxide and FC-8 fluorocarbon surfactant, then adding ethylene glycol, glycerol and water, and finally stirring for 1h at 40 ℃ to prepare the high condensate oil anti-freezing foam discharging agent.
Example 2
The anti-freezing foam drainage agent for the high condensate oil comprises the following raw materials in percentage by mass: 30% of cocoyl diethanol amine, 30% of lauramidopropyl amine oxide, 30% of glycerol, 0.5% of INTECHEM-08 (FC-8) fluorocarbon surfactant and the balance of water.
The preparation method of the high condensate oil anti-freezing foam discharging agent comprises the following steps: firstly weighing raw materials according to a proportion, uniformly mixing cocoyl diethanol amine, lauramidopropyl amine oxide and FC-8 fluorocarbon surfactant, then adding glycerol and water, and finally stirring for 0.5h at 50 ℃ to prepare the high condensate oil anti-freezing foam discharging agent.
Example 3
The anti-freezing foam drainage agent for the high condensate oil comprises the following raw materials in percentage by mass: 25% of cocoyl diethanol amine, 25% of lauramidopropyl amine oxide, 15% of ethylene glycol, 30% of glycerol, 0.8% of INTECHEM-03 (FC-3) fluorocarbon surfactant and the balance of water.
The preparation method of the high condensate oil anti-freezing foam discharging agent comprises the following steps: firstly weighing raw materials according to a proportion, uniformly mixing cocoyl diethanol amine, lauramidopropyl amine oxide and FC-3 fluorocarbon surfactant, then adding ethylene glycol, glycerol and water, and finally stirring for 0.7h at 45 ℃ to prepare the high condensate oil anti-freezing foam discharging agent.
Example 4
The anti-freezing foam drainage agent for the high condensate oil comprises the following raw materials in percentage by mass: 25% of cocoyl diethanol amine, 25% of lauramidopropyl amine oxide, 10% of ethylene glycol, 20% of glycerol, 0.8% of INTECHEM-03 (FC-3) fluorocarbon surfactant and the balance of water. The other conditions were the same as in example 3.
Example 5
The anti-freezing foam drainage agent for the high condensate oil comprises the following raw materials in percentage by mass: 25% of cocoyl diethanol amine, 25% of lauramidopropyl amine oxide, 20% of ethylene glycol, 30% of glycerol, 0.8% of INTECHEM-03 (FC-3) fluorocarbon surfactant and the balance of water. The other conditions were the same as in example 3.
Comparative example 1
The procedure of example 3 was repeated except that the fluorocarbon surfactant of starting material INTECHEM-03 (FC-3) was replaced with the fluorocarbon surfactant of INTECHEM-01 (FC-1).
Comparative example 2
Raw material INTECHEM-03 (FC-3) fluorocarbon surfactant was omitted and the other conditions were the same as in example 3.
Experimental example
The foam discharging agent used in the following experimental examples is the anti-freezing foam discharging agent for resisting high condensate oil prepared in the examples and the comparative examples.
1. Reagents for experiments
(1) Simulated mineralized water: 149g of sodium chloride, 28g of calcium chloride and 23g of magnesium chloride are respectively weighed into a beaker, stirred with 800mL of distilled water until the solution is completely dissolved, and the dissolved solution is transferred into a 1000mL volumetric flask to prepare simulated mineralized water with the concentration of 2X 10 5 mg/L.
(2) Foam discharging agent solution A: 3g of the foam discharging agent is respectively dissolved in 500mL of simulated mineralized water, and then transferred into a 1000mL volumetric flask for constant volume to prepare a foam discharging agent solution with the concentration of 0.3wt% for measuring compatibility and surface tension.
(3) Foam discharging agent solution B: mixing simulated mineralized water and condensate oil in a volume ratio of 5-8:2-5, and then adding a foam discharging agent subjected to low-temperature freezing at-30 ℃ for 24 hours or constant-temperature at 90 ℃ for 16 hours to prepare a foam discharging agent solution B with the concentration of 1wt%, wherein the foam discharging agent solution B is used for testing foaming power and liquid carrying rate.
2. Physical and chemical index test
(1) Condensation point of stock solution
Pouring 50mL of the foam discharging agent stock solution into a clean and dry beaker, sealing with a preservative film, and placing the beaker in a low-temperature freezer at-30 ℃ for 24 hours to obtain the frozen foam discharging agent, wherein the foam discharging agent does not lose fluidity after freezing.
(2) Compatibility of medicines
100ML of the 0.3wt% strength foam discharging agent solution was measured and heated in a water bath at 65℃for 4 hours, and no color change or precipitation was observed.
(3) Surface tension measurement
The surface tension of the foam discharging agent solution A was measured by a plate method according to the standard SY/T5370-2018 surface and interfacial tension measurement method, and the results are shown in Table 1.
TABLE 1 surface tension data for high condensate anti-freeze foam discharging agent
The foam performance depends on the surface tension of the foam discharging agent under corresponding conditions, and the lower the surface tension is, the easier the gas-liquid system is dispersed. As is clear from Table 1, the maximum surface tension of the condensate draining agent of the present invention was 27.88mN/m.
3. Foam Performance test
And (3) loading the high condensate oil resistant antifreezing foam discharging agent into an aging tank, putting the aging tank into a constant-temperature drying oven, setting the temperature of the drying oven to 90 ℃, and performing heat treatment for 16 hours to obtain the heat-treated foam discharging agent.
And respectively pouring 50mL of the anti-high condensate oil antifreezing foam discharging agent into a clean and dry beaker, sealing with a preservative film, and placing the sealed foam discharging agent in a low-temperature freezer at the temperature of minus 30 ℃ for 24 hours to obtain the frozen foam discharging agent.
3.1 Foaming force
The foaming force is generally evaluated by a foam height index, and the degree of foaming and the degree of stability of the foam can be grasped by the foam height. The foam forming and foam stabilizing properties of the foam discharging agent were determined by the Ross-Miles method. Foam heights were determined for the foam concentrate solutions at 65℃for 0min and 5min, as specified in Standard GB/T13173-2008 method for surfactant detergent test 11.4.3.
The experimental process comprises the following steps:
(1) The Rogowski bulb was preheated to 65℃with a super thermostatic water bath.
(2) Preparing a required experimental sample liquid by using the treated foam discharging agent stock solution, condensate oil and simulated mineralized water with the mineralization degree of 2X 10 5 mg/L, and heating the experimental sample liquid to 65 ℃.
(3) The inner wall of the Rogowski foam instrument tube is rinsed by water, then a bottom valve is closed, an experimental sample liquid is added to a standard scale (50 mL) at the bottom of the Rogowski foam instrument, the experimental sample liquid is sucked by a 200mL pipette and placed at the center of the upper end of the Rogowski foam instrument, the liquid level of the bottom base liquid is aligned, the experimental sample liquid is vertically put down, and then an initial maximum height value H 0 (mm) of foam rising in the Rogowski foam instrument tube and a foam height value H 5 (mm) after 5min are recorded.
The foaming power of the foam discharging agent after freezing and after heat treatment was measured, and the measurement data are shown in Table 2.
TABLE 2 Rogowski foam height data for foam discharging agent
Analysis of results: when the treatment modes of the foam discharging agent are the same, the foam height of the foam discharging agent is in an ascending trend within 5 minutes along with the increase of the concentration of condensate oil in the solution; when the concentration of the components of the solution is the same, the foaming force effect of the foam discharging agent subjected to low-temperature freezing and heat treatment is not very different. The foaming agent prepared by the invention has good foaming performance and good foam stabilizing effect, and the foaming performance is not affected basically under the conditions of low temperature and high temperature.
3.2 Liquid carrying capacity
The measurement of the liquid carrying rate belongs to an air flow method, wherein the air flow method is to test the water carrying capacity of foam under the stirring of air flow of a foam discharging agent solution, and the more the water carrying volume is, the stronger the liquid carrying capacity is, which indicates that the better the stability of the foam is.
The experimental process comprises the following steps:
(1) The liquid carrying instrument was preheated to 65℃with a super thermostatic water bath.
(2) Preparing a required experimental sample liquid by using the treated foam discharging agent stock solution, condensate oil and simulated mineralized water with the mineralization degree of 2X 10 5 mg/L, and heating the experimental sample liquid to 65 ℃.
(3) The inner wall of the liquid carrying instrument is rinsed by water, the bottom dispersing head is connected, the air pump is opened, the air flow is controlled at 8-10L/min, the air outlet pipe is connected with the dispersing head to enable air to be introduced into the liquid carrying instrument, the preheated 250mL experimental liquid sample is poured into the liquid carrying instrument, the elbow is connected immediately, the time is counted, the liquid carried out is collected by the liquid collector, the liquid carrying time is counted for 15min or until no foam is carried out, and the volume of the liquid carried out is measured by the measuring cylinder, so that the liquid carrying amount of the experimental liquid sample is obtained. Liquid carrying rate= (liquid carrying amount/total volume of experimental sample liquid) ×100%.
The liquid carrying capacity of the foam discharging agent after freezing and after heat treatment was tested, the total volume of the test sample liquid was 250mL, and the test data are shown in Table 3.
Table 3 liquid carrying data for foam discharging agent
Analysis of results: as shown in Table 3, the liquid carrying rate of the condensate oil foam discharging agent can be up to 84% in the range of 20-50% of condensate oil content, the condensate oil can be up to 50% and the mineralization resistance can be up to 2X 10 5 mg/L, and the foam liquid carrying amount is large. When the treatment modes of the foam discharging agent are the same, the liquid carrying rate of the foam discharging agent is increased along with the increase of the concentration of condensate oil in the solution; when the concentration of the components of the solution is the same, the liquid carrying rate of the foam discharging agent after heat treatment generally tends to increase. The foam drainage agent prepared by the invention has good salt resistance and oil resistance, and also has good foam water carrying capacity under the conditions of low temperature and high temperature, and if the condensate-resistant foam drainage agent prepared by the invention is added into a well bottom, the condensate in the well can be efficiently drained, the drainage gas production efficiency is improved, and the normal production of a gas well is recovered as soon as possible.
Claims (6)
1. The anti-freezing foam discharging agent for the high condensate oil is characterized by comprising the following raw materials in percentage by mass: 15-30% of cocoyl diethanol amine, 20-30% of lauramidopropyl amine oxide, 30-50% of antifreezing agent, 0.5-1% of fluorocarbon surfactant and the balance of water; the antifreezing agent is glycol and/or glycerol; the fluorocarbon surfactant is INTECHEM-03 fluorocarbon surfactant or INTECHEM-08 fluorocarbon surfactant.
2. The high condensate oil antifreeze foam-exhaust agent of claim 1, wherein the raw materials used comprise, in mass percent: 15% of cocoyl diethanol amine, 20% of lauramidopropyl amine oxide, 50% of antifreezing agent, 1% of fluorocarbon surfactant and the balance of water.
3. The high condensate oil antifreeze foam-exhaust agent of claim 1, wherein the raw materials used comprise, in mass percent: 30% of cocoyl diethanol amine, 30% of lauramide propyl amine oxide, 30% of antifreezing agent, 0.5% of fluorocarbon surfactant and the balance of water.
4. The high condensate oil antifreeze foam-exhaust agent of claim 1, wherein the raw materials used comprise, in mass percent: 25% of cocoyl diethanol amine, 25% of lauramidopropyl amine oxide, 45% of antifreezing agent, 0.8% of fluorocarbon surfactant and the balance of water.
5. The method for preparing the high condensate oil antifreeze foam-removing agent as claimed in any one of claims 1 to 4, which is characterized by comprising the following steps: firstly weighing raw materials according to a proportion, uniformly mixing cocoyl diethanol amine, lauramidopropyl amine oxide and fluorocarbon surfactant, then adding an antifreezing agent and water, and finally stirring for 0.5-1h at 40-50 ℃ to prepare the high condensate oil antifreezing foam discharging agent.
6. Use of the high condensate freezing-resistant foam drainage agent according to any one of claims 1 to 4 in drainage and gas production of natural gas wells.
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