CN111821722B - Nano solid defoaming agent for gas well foam drainage gas production and preparation method thereof - Google Patents
Nano solid defoaming agent for gas well foam drainage gas production and preparation method thereof Download PDFInfo
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- CN111821722B CN111821722B CN201910322820.5A CN201910322820A CN111821722B CN 111821722 B CN111821722 B CN 111821722B CN 201910322820 A CN201910322820 A CN 201910322820A CN 111821722 B CN111821722 B CN 111821722B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D19/00—Degasification of liquids
- B01D19/02—Foam dispersion or prevention
- B01D19/04—Foam dispersion or prevention by addition of chemical substances
- B01D19/0404—Foam dispersion or prevention by addition of chemical substances characterised by the nature of the chemical substance
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D19/00—Degasification of liquids
- B01D19/02—Foam dispersion or prevention
- B01D19/04—Foam dispersion or prevention by addition of chemical substances
- B01D19/0404—Foam dispersion or prevention by addition of chemical substances characterised by the nature of the chemical substance
- B01D19/0409—Foam dispersion or prevention by addition of chemical substances characterised by the nature of the chemical substance compounds containing Si-atoms
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D19/00—Degasification of liquids
- B01D19/02—Foam dispersion or prevention
- B01D19/04—Foam dispersion or prevention by addition of chemical substances
- B01D19/0404—Foam dispersion or prevention by addition of chemical substances characterised by the nature of the chemical substance
- B01D19/0413—Foam dispersion or prevention by addition of chemical substances characterised by the nature of the chemical substance compounds containing N-atoms
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Abstract
The invention discloses a nano solid defoaming agent for gas well foam drainage gas production and a preparation method thereof. The invention provides a nano solid defoaming agent for gas well foam drainage gas production, which comprises the following raw material components in parts by weight: 12-22 parts of dimethyl silicone oil; 1-4 parts of modified silicon dioxide nano particles; 72-76 parts of a curing agent; 1-4 parts of an emulsifier. The invention also provides a method for preparing the nano solid defoaming agent for gas well foam drainage gas production, which comprises the following steps: 1) mixing dimethyl silicone oil and modified silicon dioxide nano particles, heating and stirring, and cooling to a preset temperature to obtain a defoaming agent main body; 2) heating the curing agent to be molten, mixing the curing agent with the emulsifier and the defoaming agent main body prepared in the step 1), and stirring at constant temperature to obtain the nano solid defoaming agent for gas well foam drainage gas production. The nanometer solid defoaming agent for gas well foam drainage gas production has strong defoaming and foam inhibiting capabilities.
Description
Technical Field
The invention relates to the technical field of natural gas exploitation. More particularly relates to a nano solid defoaming agent for gas well foam drainage gas production and a preparation method thereof.
Background
With the continuous development of gas field exploitation, the formation water yield is gradually increased, and the foam drainage gas recovery process adopted in the middle and later stages of exploitation becomes an essential process for ensuring continuous and stable production. An important link at the tail end of the foam drainage process is to eliminate foam and ensure gas-water separation, and if the foam is not completely eliminated, a plurality of adverse effects can be caused, such as influence on metering of instruments, increase of pipe pressure, foam flameout in a booster, foam salt formation in a dehydration pry and the like. The defoaming agent applied on site at present mainly comprises an emulsion type organic silicon defoaming agent, the filling process is different, the defoaming agent emulsion is diluted according to the using amount of a foam discharging agent in proportion, and then is pumped by a defoaming pry and a defoaming tank or is continuously filled by a balance tank, the filling position is generally set at a manifold before entering a gas collecting station, and the defoaming agent can be filled while being filled at a single well mouth.
According to the special conditions of each large field, the filling process of the defoaming agent is partially improved and innovated. Despite various measures, emulsion defoamers still have problems in use, and the following aspects are shown: (1) the defoaming effect is fluctuant; (2) the stability of the emulsion defoamer after dilution is not strong; (3) the injection cost of the emulsion defoaming agent is high; (4) the packing and transportation costs are high. In view of the above problems, solid defoaming technology has been developed in recent years, but the conventional solid defoaming agent has problems of poor defoaming effect, high cost and the like, and the effect is not ideal.
Therefore, the invention provides a nano solid defoaming agent for gas well foam drainage gas production and a preparation method thereof, and aims to solve the technical problems.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a nano solid defoaming agent for gas well foam drainage gas production. The nanometer solid defoaming agent is used for defoaming foam returning to the ground before entering a separator after a foam drainage gas production process is adopted in a water-outlet gas well, so that the foam returning from a shaft is completely eliminated before the separator, and the subsequent flow and equipment are not damaged.
The second purpose of the invention is to provide a preparation method of the nano solid defoaming agent for gas well foam drainage gas production.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a nano solid defoaming agent for gas well foam drainage gas production, which comprises the following raw material components in parts by weight:
in the invention, the dimethyl silicone oil is used as a main component of the nano solid defoaming agent and is a defoaming and foam inhibiting main component; the modified silicon dioxide nano particles are efficient defoaming and foam inhibiting auxiliaries and are used for enhancing the overall performance of the defoaming agent; the curing agent is used for curing the liquid defoaming agent formed by the dimethyl silicone oil and the modified silicon dioxide nano particles to form a solid defoaming agent; the main component of the defoaming agent is the dimethyl silicone oil which is insoluble in water, so the emulsifying agent is added, and the emulsifying agent mainly has the function of emulsifying the dimethyl silicone oil so as to disperse the dimethyl silicone oil into a liquid phase and foam in the defoaming process, thereby achieving the optimal defoaming effect.
Preferably, the modified silica nanoparticles are polydimethylsiloxane-modified nano silica particles. According to the invention, polydimethylsiloxane is selected to modify the nano silicon dioxide particles, so that the surface properties of the nano silicon dioxide particles are changed, and the nano particles with strong hydrophobicity are obtained; by means of the needlepoint and the permeation of the hydrophobic nano-particles, the hydrophobic nano-particles are compounded with the dimethyl silicone oil, so that the entry energy barrier and the entry depth of the dimethyl silicone oil in a bubble film are reduced, the synergistic effect of the dimethyl silicone oil and the bubble film is fully exerted, the resistance of establishing an oil bridge in the defoaming process is reduced, and the defoaming efficiency of the dimethyl silicone oil is greatly improved; meanwhile, in the defoaming process, the hydrophobic nano particles can be quickly absorbed by the surfactant on the bubble liquid film, surfactant consumption points are formed on the liquid film, the local surface tension is quickly reduced, and the shrinkage force is generated to break the bubbles; in addition, when the hydrophobic particles are fully wetted by the dimethicone, the critical contact angle of the liquid film with the oil droplets will be reduced, making the liquid film more easily destroyed, thereby accelerating foam collapse.
Preferably, the polydimethylsiloxane modified nano-silica particles are prepared from the following raw material components in parts by weight:
wherein the concentration of the ammonia water is 20-25 wt%; the particle size of the silicon dioxide particles is 10-20 nm; the smaller the particle size of the silica particles, the better the dissipation effect of the resulting polydimethylsiloxane-modified nano silica particles, while the smaller the particle size, the higher the cost, and for both performance and economy, the particle size of the silica particles is more preferably 12 nm.
Preferably, the solidifying agent is sucrose, polyethylene glycol, paraffin or sodium acetate. The optimized curing agent is used for the nano solid defoaming agent, the effective components of the defoaming agent are not influenced completely after the defoaming agent is cured and molded, the formed solid defoaming agent is compact in structure and not easy to break, and the solvent speed is moderate; further, the curing agent is sucrose; the sucrose does not chemically react with the main formula of the nano solid defoaming agent, and the performance of the effective components is not influenced; in addition, the water-soluble polyurethane is soluble in water, the dissolving speed is moderate, and no solid residue is generated after the dissolution; has certain strength, and is beneficial to transportation and on-site installation.
Preferably, the emulsifier is emulsifier MOA-3, emulsifier MOA-5 or emulsifier S-185. The emulsifier has a good emulsifying effect, is beneficial to emulsification of the dimethyl silicone oil, and further improves the defoaming effect of the nano solid defoaming agent.
Preferably, the shape of the nano solid defoaming agent for gas well foam drainage gas production is a rod. One skilled in the art can understand that the shape of the nano solid defoaming agent can be any shape; of these, a stick is preferred to be able to fit the solid defoamer equipment commonly used in the field.
The invention also provides a method for preparing the nano solid defoaming agent for gas well foam drainage gas production, which comprises the following steps:
1) mixing dimethyl silicone oil and modified silicon dioxide nano particles, heating and stirring, and cooling to a preset temperature to obtain a defoaming agent main body;
2) heating the curing agent to be molten, mixing the curing agent with the emulsifier and the defoaming agent main body prepared in the step 1), and stirring at constant temperature to obtain the nano solid defoaming agent for gas well foam drainage gas production.
Preferably, the heating temperature in the step 1) is 230-250 ℃.
Preferably, the stirring time in the step 1) is 3-5 hours, and the stirring speed is 4000-5000 r/min.
Preferably, the predetermined temperature of the cooling in the step 1) is 15-20 ℃.
Preferably, the heating temperature of the curing agent in the step 2) is 185-195 ℃. Further, it is understood by those skilled in the art that the temperature of the constant temperature stirring in the step 2) is to maintain the heating melting temperature of the curing agent.
Preferably, the stirring time in the step 2) is 1.5-2 h, and the stirring speed is 500-800 r/min.
Preferably, after the step of stirring at constant temperature in the step 2), a step of cooling and forming is further included; further, the step of cooling and forming comprises the steps of placing the material stirred at constant temperature in a packaging mold, cooling to 15-20 ℃, and directly forming into a required shape; more preferably, the packaging mould is a foam row bar mould.
Preferably, the modified silica nanoparticles in step 1) are prepared by the following steps:
a. mixing silica particles, methanol, polydimethylsiloxane and deionized water according to a proportion, heating and stirring to obtain a mixed solution;
b. and (b) adding ammonia water into the mixed solution prepared in the step (a), and stirring to obtain the modified silicon dioxide nano-particles. According to the invention, the ammonia water is added to promote the chemical reaction of the modified silicon dioxide nano-particles and improve the preparation yield.
Preferably, the heating temperature in the step a is 60-85 ℃.
Preferably, the stirring time in the step a is 3-5 h, and the stirring speed in the step a is 500-800 r/min.
Preferably, the stirring time in the step b is 0.5-1 h; the stirring speed in the step b is 500-800 r/min; wherein the stirring speed in the step a is the same as that in the step b.
Preferably, after the step of adding ammonia water for reaction in the step b, a step of drying is further included; further, the drying temperature is 60-75 ℃, and the drying time is 5-6 h.
Unless otherwise specified, any range recited herein includes any value between the endpoints and any sub-range defined by any value between the endpoints or any value between the endpoints.
The invention has the following beneficial effects:
(1) the nanometer solid defoaming agent for gas well foam drainage gas production provided by the invention has strong defoaming and foam inhibiting capabilities, is solid and easy to package, transport and store, and can be used for eliminating foam returned from a shaft before entering a separator after ensuring that a foam drainage gas production process is adopted in a water-yielding gas well in the defoaming treatment of the gas well foam drainage gas production without damaging subsequent processes and equipment.
(2) The preparation method of the nanometer solid defoaming agent for gas well foam drainage gas production provided by the invention is simple, the raw material source is wide, and the cost is low.
Detailed Description
In order to more clearly illustrate the invention, the invention is further described below in connection with preferred embodiments. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.
In the invention, the preparation method is a conventional method if no special description is provided; the starting materials used are commercially available from published sources unless otherwise specified.
Example 1
This example provides a polydimethylsiloxane-modified nanosilica particle.
The polydimethylsiloxane modified nano silicon dioxide particle comprises the following raw materials:
3g of silica particles having a particle size of 12nm, 120mL of 24 wt% aqueous ammonia, 2mL of polydimethylsiloxane, 100mL of methanol and 30mL of deionized water; wherein, the silicon dioxide particles, the ammonia water, the polydimethylsiloxane and the methanol are all analytically pure, and the resistivity of the deionized water is 18M omega cm;
the preparation method comprises the following steps: weighing the raw materials according to the proportion, sequentially adding silicon dioxide particles, methanol, polydimethylsiloxane and deionized water into a three-necked bottle, uniformly mixing, stirring at a rotating speed of 600r/min, heating to 60 ℃, and reacting for 4 hours to obtain a mixed solution; adding ammonia water into the mixed solution, continuously stirring for 1 hour at the rotating speed of 600r/min, and drying the product in an oven at 70 ℃ for 6 hours to obtain the polydimethylsiloxane modified nano silicon dioxide particles.
Example 2
The embodiment provides a nano solid defoaming agent for gas well foam drainage gas production.
The nanometer solid defoaming agent for gas well foam drainage gas production comprises the following raw materials:
1.2g of the polydimethylsiloxane-modified nanosilica particles prepared in example 1, 21g of dimethicone, 2g of emulsifier S-185 and 74g of the curative sucrose.
The preparation method of the nano solid defoaming agent for gas well foam drainage gas production comprises the following steps:
weighing the raw materials according to the proportion, uniformly mixing the dimethyl silicone oil and the nano silicon dioxide particles modified by the dimethyl silicone oil, heating to 240 ℃, stirring the mixture for 4 hours at the rotating speed of 4000r/min, and cooling to 20 ℃ to obtain a main defoaming agent body;
heating sucrose serving as a curing agent to 190 ℃ to be molten, adding a defoaming agent main body and an emulsifier S-185, stirring at a constant speed of 600r/min for 1.5h, fully mixing, pouring into a foam discharging rod mold, and cooling and molding to obtain the nano solid defoaming agent for gas well foam water drainage and gas production.
Comparative example 1
The comparative example provides a nano solid defoamer for gas well foam drainage gas production.
The nanometer solid defoaming agent for gas well foam drainage gas production comprises the following raw materials:
0g of the polydimethylsiloxane-modified nanosilica particles prepared in example 1, 21g of dimethicone, 2g of emulsifier S-185 and 74g of the curative sucrose.
The preparation method of the nano solid defoaming agent for gas well foam drainage gas production comprises the following steps:
weighing the raw materials according to the proportion, heating sucrose serving as a curing agent to 190 ℃ until the sucrose is molten, adding dimethyl silicone oil and an emulsifier S-185, stirring at the constant temperature of 600r/min for 1.5h, fully mixing, pouring into a foam discharging rod mold, and cooling and molding to obtain the nano solid defoaming agent for gas well foam drainage gas production.
The performance of the nano solid defoaming agent for gas recovery of gas well foam drainage is tested and compared with a solid defoaming rod sold in China, the test method adopts an evaluation method specified in GB/T21885-:
TABLE 1 test results
| Classes of defoaming agents | Defoaming time/s | Foam inhibition time/min |
| Example 2 | 7.5 | 22 |
| Comparative example 1 | 18 | 4 |
| Solid defoaming bar 1 sold in domestic market | 68 | 1.5 |
Table 1 a commercially available solid defoaming bar 1 in china was provided by yobi scientific llc.
And (4) conclusion: as can be seen from table 1, the nano solid defoaming agent for gas recovery from gas well foam drainage provided in example 2 of the present invention has high defoaming performance and foam suppressing performance, and compared with a conventional solid defoaming bar, the defoaming force of the nano solid defoaming bar provided in the present invention is increased by 8 times, and the foam suppressing capability is increased by 13.6 times.
Compared with the comparative example 1, the modified silica nano particles are added in the example 2, the defoaming time of the prepared nano solid defoaming bar is reduced from 18s to 7.5s, and the foam inhibition time is increased from 4 minutes to 18 minutes.
The prepared nano solid defoaming agent for gas well foam drainage gas production is subjected to field test in Changqing oil fields, 178 wells are tested in an accumulated mode, the returned foam defoaming rate is 100%, and the nano solid defoaming agent can be effectively used for gas well foam drainage gas production.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications may be included within the scope of the present invention.
Claims (10)
1. The nanometer solid defoaming agent for gas well foam drainage gas production is characterized by comprising the following raw material components in parts by weight:
wherein the curing agent is sucrose;
the modified silica nanoparticles are polydimethylsiloxane-modified silica nanoparticles, and the polydimethylsiloxane-modified silica nanoparticles are prepared from the following raw material components in parts by weight:
wherein the particle size of the silicon dioxide particles is 12 nm.
2. The nano solid antifoaming agent for gas well foam drainage gas recovery according to claim 1, characterized in that the emulsifier is emulsifier MOA-3, emulsifier MOA-5 or emulsifier S-185.
3. The nano solid antifoaming agent for gas well foam drainage gas recovery as claimed in claim 1 or 2, wherein the nano solid antifoaming agent for gas well foam drainage gas recovery is rod-shaped.
4. The preparation method of the nano solid defoaming agent for gas well foam drainage gas production according to any one of claims 1 to 3, characterized by comprising the following steps:
1) mixing dimethyl silicone oil and modified silicon dioxide nanoparticles, heating and stirring, wherein the heating temperature is 230-250 ℃, the stirring time is 3-5 h, the stirring speed is 4000-5000 r/min, and cooling to a preset temperature to obtain a defoaming agent main body;
2) heating the curing agent to be molten, mixing the curing agent with the emulsifier and the defoaming agent main body prepared in the step 1), and stirring at constant temperature to obtain the nano solid defoaming agent for gas well foam drainage gas production.
5. The method of claim 4, wherein the modified silica nanoparticles in step 1) are prepared by:
a. mixing silica particles, methanol, polydimethylsiloxane and deionized water according to a proportion, heating and stirring to obtain a mixed solution;
b. and (b) adding ammonia water into the mixed solution prepared in the step (a), and stirring to obtain the modified silicon dioxide nano-particles.
6. The method according to claim 4 or 5, wherein the predetermined temperature of the cooling in the step 1) is 15 to 20 ℃.
7. The method according to claim 4 or 5, wherein the curing agent is heated at 185 to 195 ℃ in the step 2).
8. The preparation method according to claim 4 or 5, wherein the stirring time in the step 2) is 1.5-2 h.
9. The method according to claim 4 or 5, wherein the stirring speed in the step 2) is 500 to 800 r/min.
10. The method according to claim 4 or 5, wherein the step of stirring at constant temperature in step 2) is followed by a step of cooling and forming.
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| CN112473191A (en) * | 2020-11-25 | 2021-03-12 | 中国石油天然气股份有限公司 | Organic silicon solid defoaming particles and preparation method thereof |
| CN115317961A (en) * | 2022-08-24 | 2022-11-11 | 哈药集团技术中心 | Preparation method of dimethyl silicone oil defoaming agent |
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