CN110964488A - Cold-resistant foaming agent and application method thereof - Google Patents

Cold-resistant foaming agent and application method thereof Download PDF

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CN110964488A
CN110964488A CN201811148849.8A CN201811148849A CN110964488A CN 110964488 A CN110964488 A CN 110964488A CN 201811148849 A CN201811148849 A CN 201811148849A CN 110964488 A CN110964488 A CN 110964488A
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foaming agent
cold
potassium
sodium
resistant
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李晟贤
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Yao Xinqiao
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Beijing Unity Beneficial Technology Co ltd
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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
    • C09K8/02—Well-drilling compositions
    • C09K8/03—Specific additives for general use in well-drilling compositions
    • C09K8/035—Organic additives
    • 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
    • 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
    • C09K8/60—Compositions for stimulating production by acting on the underground formation
    • C09K8/62—Compositions for forming crevices or fractures
    • C09K8/70—Compositions for forming crevices or fractures characterised by their form or by the form of their components, e.g. foams
    • C09K8/703—Foams

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  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Medicinal Preparation (AREA)

Abstract

The invention discloses a cold-resistant foaming agent, which comprises the following raw materials: 1) 0.1-100 parts of a foaming agent; 2) 1-100 parts of salt or/and urea or/and sugar; 3) 1-100 parts of water. The invention also discloses an application method of the cold-resistant foaming agent. The invention can effectively solve the problems of freezing and solidification of the foaming agent during outdoor storage and transportation; when the methanol-methanol composite foaming agent is used for oil gas production and drainage gas production, the problem of continuous dosing in winter can be effectively solved, and the problem of reducing the foaming effect of the foaming agent by using methanol can be effectively solved; has the advantages of easy implementation, wide application, easy popularization and the like.

Description

Cold-resistant foaming agent and application method thereof
Technical Field
The invention relates to the fields of active agent production, oil and gas production, drainage and gas production and outdoor fire fighting, in particular to a cold-resistant foaming agent and an application method thereof.
Background
At present, foaming agents are commonly applied in the production of domestic oil fields and gas fields, and have the following defects:
1) when the foaming agent is applied to the production of oil fields and gas fields, an outdoor dosing method is generally adopted, so that the foaming agent is frozen (or solidified) in severe cold winter, and the foaming agent cannot be used in winter in severe cold winter, so that the production of the oil fields and the gas fields is seriously influenced.
Known from the knowledge in the art: at present, the foaming agents in China are aqueous solutions of active agents, namely the foaming agents are all prepared by dissolving the active agents in water; the finished foaming agent has higher viscosity at normal temperature, and is generally diluted by clear water before use; therefore, the freezing point (also called freezing point) of the foaming agent is usually higher than 0 ℃, the foaming agent is inevitably frozen (or solidified) into blocks in a winter severe cold environment below 0 ℃, and the foaming agent is inevitably frozen (or solidified) in winter when stored and dosed for a long time in a gas well site without a power supply and a heat source.
Take Dongsheng gas field as an example.
Known from the knowledge in the art: the Dongsheng gas field is located in inner Mongolian Ordos city, the lowest temperature in winter can reach-31 ℃, a natural gas well field does not have an industrial power supply and a heat source, the wellhead temperature of a gas well in winter is generally not higher than 10 ℃, and the wellhead temperature of a large number of gas wells is lower than 0 ℃; when natural gas enters a well bore from a stratum in the gas field, formation water (containing a small amount of liquid hydrocarbon) and the natural gas enter the well bore at the same time, and generally, 10000Nm is produced every time3The natural gas can simultaneously produce 0.5-10 square of formation water, and the daily water yield of a single well can reach 0.5-50 square/day; in order to make the liquid in the well bore of the gas well rise to the surface pipeline, the gas field usually adds foaming agent (commonly called chemical) into the gas well casing, and can be summarized as: diluting a foaming agent with water to obtain a foaming agent aqueous solution, adding the foaming agent aqueous solution into a gas well casing (or an oil pipe), allowing the foaming agent aqueous solution to be in contact with and mixed with liquid in a gas well, and generating a large amount of water-containing foam under the stirring action of a natural gas flow so as to reduce the liquid density of a gas well shaft, so that accumulated liquid in the gas well can be smoothly carried to the ground by the natural gas flow, and the gas well can normally produce; before the gas field and the gas well are added with the chemicals, the foaming agent is generally adopted: diluting the clear water into a foaming agent aqueous solution in a ratio of 1:10, and periodically adding the foaming agent aqueous solution into a gas well casing (or an oil pipe) by using a vehicle-mounted pump and a pipeline, wherein the adding time is generally more than 30 minutes; therefore, when the foaming agent (or the foaming agent aqueous solution) in a normal temperature state is added to the gas field and the gas well in winter, the foaming agent (or the foaming agent aqueous solution) is often seriously frozen (or solidified) in the transportation and adding processes, so that the foaming agent (or the foaming agent aqueous solution) is difficult to add to the gas well; even if the foaming agent (or the foaming agent aqueous solution) is heated to more than 50 ℃ in advance and heat preservation is adopted, the foaming agent (or the foaming agent aqueous solution) cannot be heated and heated during the medicine adding process because the gas field well site has no heat source, and the foaming agent (or the foaming agent aqueous solution) can be transported and added for a long timeThe process can still freeze (or freeze); especially when the gas well wellhead temperature is below 0 ℃, the foamer (or aqueous foamer solution) temperature delivered to the well site is as high as 100 ℃, which can still rapidly dissipate heat and cause the foamer (or aqueous foamer solution) to freeze (or set) due to the gas well wellhead, pipeline, wellbore temperature below 0 ℃, making it difficult to add the foamer (or aqueous foamer solution) to the gas well.
Take Liaohe oil field as an example.
Known from the knowledge in the art: the oil field is located in Liaoning province, the lowest temperature can reach-27 ℃ in winter, a large amount of foaming agent is often injected into an oil well and a water injection well for foam plugging, or a large amount of foaming agent is injected into the oil well and the water injection well for foam flooding; before adding the medicine, the foaming agent is generally added: diluting the foaming agent aqueous solution with clear water in a ratio of 1:10, and adding the foaming agent aqueous solution into a gas well casing (or an oil pipe) by using a pump and a pipeline, wherein the adding time is generally more than 2 hours; there is also a need to address the problem of foaming agent freezing (or freezing) during winter filling.
2) The fire extinguishing method of generating foam by using a foaming agent and spraying the foam is often used during outdoor fire fighting, so that the problem that the foaming agent is frozen (or solidified) to influence the fire extinguishing effect exists during outdoor fire fighting in severe cold winter, and the fire extinguishing process cannot be carried out in serious cases.
Take Liaohe oil field oil tank fixed fire extinguishing system as an example.
Known from the knowledge in the art: the method can be summarized as follows: firstly, a foam generator, a foam pipeline and other fixed foam fire extinguishing systems are arranged on an oil tank; when the oil tank is on fire, firstly, the foaming agent and clean water are mixed into foaming liquid, then the foaming liquid generates a large amount of foam through a foam pipeline and a foam generator and is sprayed to flame and a fire point (such as oil level), so that the aim of extinguishing fire is fulfilled by isolating air; when the temperature is lower than-20 ℃ in winter, the foaming liquid entering the foam pipeline and the foam generator can be partially or completely frozen (or solidified), so that the foam generation amount of the fixed fire extinguishing system is greatly reduced, and in severe cases, the foam cannot be sprayed to flames and ignition points (such as oil surfaces), and the fire extinguishing purpose cannot be realized.
3) The foaming agent in the well site is difficult to keep in a liquid state for a long time in a severe cold environment in winter, so that the foaming agent cannot be continuously added into a gas well casing (or an oil pipe) in the well site by adopting a 24-hour continuous dosing method, and only a periodic intermittent dosing method can be adopted; because the gas well is in a continuous production state, if a foaming agent is not continuously added into a gas well casing (or an oil pipe) by adopting a continuous dosing method, the effect of gas well drainage is influenced, and the dosing amount of the foaming agent is greatly increased, so that the production cost of natural gas is increased.
Take Dongsheng gas field as an example.
Known from the knowledge in the art: when the gas field and gas well are dosed, a method of periodically adding 10-30 rising foaming agents into a gas well casing (or an oil pipe) at intervals of 1-3 days is adopted, and the following defects exist: because stratum water entering a gas well shaft from a gas layer is relatively constant, the periodic dosing method inevitably causes the concentration of the foaming agent in shaft liquid to be continuously reduced in 1-3 days after dosing; in the initial dosing stage, the foaming agent concentration in the gas well shaft liquid is high, so that a large amount of foam is easily formed in the gas well shaft, a well head and a pipeline to cause foam blockage, and a large amount of medicament is wasted; in the later period of dosing, the concentration of the foaming agent in the gas well shaft liquid is very low, and the drainage effect of the gas well is seriously influenced.
4) In order to solve the problem of freezing (or solidification) of the foaming agent during the drug adding in winter, methanol is usually added into the foaming agent for freeze prevention, so that the foaming performance of the foaming agent is greatly reduced, the drug adding amount and the drug adding cost are greatly increased, and the normal production and the gas production capacity (productivity) of an oil and gas well are influenced in severe cases.
Take Dongsheng gas field as an example.
Known from the knowledge in the art: in order to solve the problem of icing (or solidification) of a foaming agent during dosing in winter, the gas field is solved by a method of firstly mixing methanol and the foaming agent into a mixed liquid in advance according to the proportion of 1-10: 1 and then adding the mixed liquid into a shaft of a gas well at present.
Known from the knowledge in the art: the methanol has strong defoaming capability, and can greatly reduce the foaming effect and foam stabilizing performance of the foaming agent.
The application tests show that: adding 1.4ml of foam promoter for Dongsheng gas field into 2 100ml measuring cylinders; then 0.6ml of methanol is added into 1 of the measuring cylinders with plugs as an experimental sample, and 0.6ml of clean water is added into the other 1 of the measuring cylinders with plugs as a blank control sample; then respectively adding 98ml of Dongsheng gas field produced water into 2 measuring cylinders with plugs; then simultaneously shaking 2 measuring cylinders with plugs up and down for 50 times, and then standing and observing; the results show that the foam half-life (50% time required for foam collapse) and the total foam collapse time of the test sample added with 0.6ml of methanol are more than 2 times faster than those of the blank control sample; thus, methanol has a remarkable defoaming effect on the foaming agent used in Dongsheng gas fields.
From methanol influence frother drainage performance production tests in Dongsheng gas field J11P4H wells it can be seen that: 2017, in 7-8 months, a production test of methanol influencing the drainage performance of a foaming agent is carried out in a J11P4H well, and the production test can be summarized as follows: diluting 10 liters of the well with foaming agent water to form 100 liters of foaming agent aqueous solution, then filling the 100 liters of foaming agent aqueous solution into the well casing according to a method of 1 day interval, and carrying out a foaming agent aqueous solution drainage performance test for 10 days; then diluting 10 liters of the well with the foaming agent in methanol to 100 liters of foaming agent methanol solution, then filling the 100 liters of foaming agent methanol solution into the well casing at intervals of 1 day, and also performing a foaming agent methanol solution drainage performance test for 10 days and comparing with the previously performed foaming agent aqueous solution drainage performance test results; the aqueous blowing agent solution drainage performance test was then conducted again for a period of 10 days and compared with the results of the previous tests. The results show that: when the foaming agent aqueous solution drainage performance test for 10 days is carried out, the daily average gas production of the well can reach 2.7 ten thousand Nm3Day, the daily average water yield can reach 10 square/day, the differential pressure of the oil jacket is less than 1MPa, and the less accumulated liquid in the oil pipe is shown (so the liquid column pressure in the oil pipe is smaller, and the differential pressure of the oil jacket is lower); and when the foaming agent methanol solution drainage performance test for 10 days is carried out, the daily average gas production of the well is reduced to 2.1 ten thousand Nm3Day, the daily average water yield is reduced to 5 square/day, the differential pressure of the oil jacket is increased to 3.5MPa, and the increase of the accumulated liquid in the oil pipe is shownThe gas well productivity is seriously affected; when the foamer aqueous solution drainage performance test is again restored to the 10 day period, the daily average gas production of the well rises to 2.5 ten thousand Nm3And daily average water yield is improved to 10 square/day, and the differential pressure of the oil jacket is less than 1MPa, which shows that the effusion in the shaft is greatly reduced. Therefore, methanol can greatly reduce the foaming performance and drainage effect of the foam promoter for Dongsheng fields.
Known from the knowledge in the art: the casing pressure (casing pressure for short) displayed by the gas well at the wellhead is usually higher than the tubing pressure (casing pressure for short) displayed at the wellhead; the oil casing pressure difference is the difference between the casing pressure of the gas well and the oil pipe pressure and is a main index for judging whether the oil pipe accumulates liquid or not; when the liquid column in the oil pipe is increased, the pressure difference of the oil sleeve is increased; conversely, as the fluid column in the oil pipe decreases, the oil jacket pressure decreases.
Take Liaohe oil field as an example.
Known from the knowledge in the art: when foam plugging or foam flooding is carried out, the larger the foaming effect and foam stabilizing capability of the foaming agent is, the better the foaming effect and foam stabilizing capability is, if methanol is adopted for antifreezing, the foaming and foam stabilizing capability of the foaming agent is inevitably and greatly reduced, the dosage of the foaming agent is greatly increased, and the expected effect of foam plugging or foam flooding can not be achieved in serious cases, so that the normal production and capacity of an oil well are seriously influenced.
5) After methanol is added into a foaming agent, methanol contained in produced water of a gas well can be caused to form methanol sewage with high toxicity, so that the sewage treatment cost can be greatly increased, and serious hidden troubles in environmental protection can be generated.
Take Dongsheng gas field as an example.
Known from the knowledge in the art: the gas field does not use a natural gas hydrate inhibitor in summer, and uses an underground throttling-ground air extraction process to solve the problem of the natural gas hydrate in winter, so methanol is not used in winter; the formation water itself does not contain methanol, so the produced water (or sewage) of the Dongsheng gas field does not contain methanol; the treatment process of the methanol-free gas field produced water (or sewage) is simple, the treatment cost is low, and the environment is not polluted after the produced water (or sewage) is reinjected into the stratum; the treatment process of the produced water (or sewage) of the gas field containing the methanol is extremely complex, and the produced water (or sewage) can be reinjected into the stratum after being treated by adopting a complex methanol recovery process; because the existing methanol recovery process can not recover 100% of methanol in the produced water (or sewage) of the gas field, the sewage after the methanol is recovered usually still contains 0.3-3% of methanol, and the hidden danger of long-term methanol pollution still exists after the methanol is reinjected into the stratum.
Patent document ZL201410003236.3 discloses "a device and method for facilitating the metering and adjustment of a medicament", which can solve the problem of continuous dosing at a well site. However, this patent does not address the problem of freezing (or freezing) of the foaming agent during continuous dosing in winter.
Disclosure of Invention
The term "blowing agent" in the present invention: also called foaming agent, foam discharging agent, water discharging agent and foaming agent.
The term "foaming effect" in the present invention: also known as foaming capacity, foaming performance.
The term "active agent" in the present invention: is the abbreviation of surfactant; means that a small amount of a substance is present which can greatly reduce the surface tension.
The term "cold-resistant" in the present invention: this is a phenomenon that the foaming agent does not freeze or solidify at 0 ℃ or lower.
The term "thickener" in the present invention: also known as foam stabilizers, broadly refers to substances that can improve foam stability.
The term "effusion" in the present invention: also known as standing water, is a generic term for liquids (both flowing and stationary) in gas well wellbores; "liquid loading" is from the gas producing formation, usually containing small amounts of liquid hydrocarbons, and is typically carried into the wellbore with the natural gas from the gas producing formation.
The term "drainage gas production" in the present invention: the method is also called gas well drainage and gas well foam drainage, and refers to a process flow and a production process of carrying accumulated liquid (or liquid water) in a gas well shaft (or oil pipe) to a wellhead and a ground pipeline by natural gas flow.
The term "produced water" in the present invention: also known as sewage or production sewage, refers to formation water produced by a gas well or an oil well.
The term "dosing" in the present invention: refers to the process or procedure of adding a foaming agent or other chemical agent to an oil well, gas well, oil and gas production process flow, equipment, pipeline.
The term "gas well" in the present invention: refers to wells for producing natural gas, including wells for producing coal bed gas, coal formed gas, shale.
The term "natural gas flow channel" in the present invention: the natural gas flowing channel also refers to a natural gas fluid flowing channel, and can refer to a natural gas pipeline, or a natural gas well shaft, an oil pipe, a casing, a wellhead, a valve, a flowmeter, a throttling element and other natural gas fluid flowing channels.
The term "addition" in the present invention: means that the amount added in the total amount is less than 50 wt%.
The invention aims to solve the first technical problem of providing a cold-resistant foaming agent. The foaming agent can effectively solve the problems of freezing and solidification of the foaming agent during outdoor storage and transportation, can effectively solve the problem of reducing the foaming effect of the foaming agent by using methanol, and can effectively solve the environmental protection problem caused by the methanol contained in the foaming agent; and the foaming agent is easy to implement, wide in application and easy to popularize.
The second technical problem to be solved by the invention is to provide an application method of a cold-resistant foaming agent. The foaming agent application method can effectively solve the problem of continuous dosing in winter in oil gas production and drainage gas production, and can effectively solve the problem of reducing the foaming effect of the foaming agent by using methanol; and the foaming agent application method is easy to implement, wide in application and easy to popularize.
In order to solve the first technical problem, the invention adopts the following technical scheme:
the invention relates to a cold-resistant foaming agent, which comprises the following substances:
1) 0.1-100 parts of a foaming agent;
2) 1-100 parts of salt or/and urea or/and sugar;
3) 1-100 parts of water.
Known from the oil recovery chemistry of 5 month 1 edition 1989 of China university Press: foaming refers to the action of an active agent that facilitates the production of foam and provides some stability after production, and active agents that provide this action are called foaming agents.
The foaming agent can be in a solid state or a liquid state at normal temperature and normal pressure, and can also be in a solid-liquid mixture state; some liquid foaming agents contain no water, and some foaming agents contain more than 95 percent of water; the foaming agent is dissolved in water no matter in a solid state or a liquid state or a solid-liquid mixture state, and the dissolving process belongs to a mature technology; the salt is dissolved in water and the dissolution process belongs to a mature technology; when the foaming agent is in a solid state, the solid-solid mixing or the solid-liquid mixing is performed with salt in any sequence, and the solid-liquid mixing is performed with salt and water in any sequence, which belong to the mature technology.
The test of the invention shows that: salt is dissolved in water to form brine, so that the brine is composed of 2 substances of salt and water in any ratio.
The test of the invention shows that: taking potassium nitrite as an example, the freezing points of 5 percent potassium nitrite aqueous solution are lower than minus 3 ℃, 15 percent potassium nitrite aqueous solution are lower than minus 12 ℃, and the freezing point of 25 percent potassium nitrite aqueous solution is lower than minus 23 ℃; thus, potassium nitrite is effective in lowering the freezing point (or freezing point) of the blowing agent and its aqueous solution.
The test of the invention shows that: the water can generate a large amount of foam by extremely low foaming agent concentration, taking Dongsheng gas field J11P4H well as an example, 10 water producing formulas/day, the actual foaming agent dosage is 10 liters every other day, the maximum foaming agent concentration is 0.1 percent, the average concentration is only 0.05 percent, namely, the foaming agent dosage concentration of 0.05 percent meets the production requirement of the well; when the well is dosed with chemicals, the foaming agent needs to be diluted with water into 100 liters of foaming agent aqueous solution; therefore, the addition concentration range of the foaming agent is extremely wide.
The test shows that: taking OP-10 as an example, the liquid prepared by mixing 10 percent of OP-10, 10 percent of potassium nitrite and 80 percent of water in any order has good foaming effect (or foaming capacity); taking sodium dodecyl benzene sulfonate as an example, 10 percent of sodium dodecyl benzene sulfonate and 10 percent of potassium nitrite are mixed into a mixture in any sequence, and then the mixture is dissolved in 80 percent of water, and the formed liquid has good foaming effect (or foaming capacity); taking dodecyl benzyl dimethyl ammonium chloride as an example, 10 percent of dodecyl benzyl dimethyl ammonium chloride and 10 percent of potassium nitrite are dissolved in water in any sequence or at the same time, and the formed liquid has good foaming effect (or foaming capacity).
The test shows that: the freezing points of the 10 percent sucrose and the 10 percent urea aqueous solution are both less than-2 ℃.
Known from the knowledge in the art: the mixing of the foaming agent and the brine in any order is solid-liquid or liquid-liquid and is well established.
Further, the sugar comprises any one of sucrose, fructose and lactose or a mixture of any two or more of sucrose, fructose and lactose in any proportion.
Further, the invention relates to a cold-resistant foaming agent, which comprises the following substances:
1) 0.1-100 parts of foaming agent with water content more than 2%;
2) 1-100 parts of salt or/and brine.
The foaming agent with the water content of more than 2 percent is liquid at normal temperature and normal pressure.
Known from the knowledge in the art: the commercial dodecyl ammonium chloride generally contains 60-95% of water, the commercial polyoxyethylene alkyl alcohol ether-10 generally contains 2-30% of water, and the commercial dodecyl benzyl dimethyl ammonium chloride generally contains 30-60% of water.
Further, the brine refers to an aqueous salt solution having a salt content of more than 2%.
Further, the foaming agent is any one of an anionic surfactant, a cationic surfactant, a nonionic surfactant, an amphoteric surfactant, a polymeric surfactant and a biosurfactant, or a mixture of any two or more of them in any ratio.
The anionic surfactant in the invention is a substance which can be dissociated in water and the part which has an active effect after the dissociation is anionic; the cationic surfactant is a substance which can be dissociated in water and the part which has an active effect after the dissociation is cationic; the non-ionic surfactant is an active agent which is not dissociated in water, and comprises any one of ester type active agent, span type active agent, ether type active agent, peregal type active agent, amine type active agent, amide type active agent, Tween type active agent and ester ether type active agent or a mixture of any more than two of the ester type active agent and the ether type active agent which are mixed in any proportion; the amphoteric surfactant refers to a substance with active part having two electrical properties, and comprises one or a mixture of more than two of nonionic-anionic active agent, nonionic-cationic active agent and anionic-cationic active agent; the polymer surfactant refers to an active agent with a relatively large molecular weight (such as a molecular weight of several thousands), and includes any one of an anionic polymer surfactant, a cationic polymer surfactant, a nonionic polymer surfactant and an amphoteric polymer surfactant, or a mixture of any two or more of them in any ratio.
The biosurfactant in the invention refers to a metabolite which is secreted by microorganisms in a metabolic process under certain conditions and has certain surface activity, such as glycolipid, polysaccharide lipid, lipopeptide or neutral lipid derivative, and the like, and is a degradable surfactant.
The test of the invention shows that: anionic surfactants, nonionic surfactants, amphoteric surfactants, anionic high molecular surfactants, nonionic high molecular surfactants, amphoteric high molecular surfactants all have good foaming action or foaming ability, and are often used as foaming agents or as active ingredients of foaming agents; biosurfactants such as sophorolipid and rhamnolipid have good foaming effect or foaming capacity, and can be used as foaming agent or effective component of foaming agent; there is no disclosure of a cationic surfactant or a polymer surfactant as a foaming agent, and there is no disclosure of a cationic surfactant or a polymer surfactant as an active ingredient of a foaming agent.
Further, the salt includes an organic salt; the organic salt comprises any one of formate, acetate, double salt, dehydroacetate and lactate or a mixture of any two or more of formate, acetate, double salt, dehydroacetate and lactate in any proportion;
preferably, the salt also comprises any one or a mixture of any two or more of the following substances mixed in any proportion: ammonium salts, nitrates of potassium, sodium and cesium, nitrites of potassium, sodium and cesium, carbonates of potassium, sodium and cesium, chlorates of potassium, sodium and cesium, perchlorates of potassium, sodium and cesium, bicarbonates of potassium, sodium and cesium, zinc nitrate, zinc chlorate, manganese nitrate.
Still further, the formate salt includes formate salts of potassium, sodium, rubidium, cesium; the acetate comprises potassium, sodium, rubidium and cesium acetate.
Furthermore, the double acid salt is any one or a mixture of any two or more of potassium biscarboxylate, potassium diacetate, sodium biscarboxylate, sodium diacetate, rubidium biscarboxylate, rubidium diacetate, cesium biscarboxylate and cesium diacetate in any proportion.
Furthermore, the dehydroacetic acid salt is any one of or a mixture of any two or more of potassium dehydroacetate, sodium dehydroacetate, rubidium dehydroacetate, cesium dehydroacetate and ammonium dehydroacetate in any proportion.
Furthermore, the lactate is any one of potassium lactate, sodium lactate, rubidium lactate, cesium lactate, calcium lactate and ammonium lactate or a mixture of any two of the above in any proportion.
The test of the invention shows that: after the organic salt is dissolved in water, the freezing point of the water can be effectively reduced to be below 0 ℃.
The test shows that: the double-acid salt is easy to dissolve in water, and the freezing point of a 10% potassium diformate water solution is lower than-5 ℃; the dehydroacetate is easy to dissolve in water, and the freezing point of a 10% sodium dehydroacetate aqueous solution is lower than-5 ℃; the lactate is easily dissolved in water, and the freezing point of a 10 percent sodium lactate aqueous solution is lower than-5 ℃; therefore, the aqueous solution of the double salt, the dehydroacetic acid salt and the lactic acid salt can effectively reduce the freezing point of water to be below 0 ℃.
Further, the salt also comprises any one or a mixture of any two or more of the following substances in any proportion: ammonium salts, nitrates of potassium, sodium or caesium, nitrites of potassium, sodium or caesium, carbonates of potassium, sodium or caesium, chlorates of potassium, sodium or caesium, perchlorates of potassium, sodium or caesium, bicarbonates of potassium, sodium or caesium, zinc nitrate, zinc chlorate and manganese nitrate.
Furthermore, in order to reduce the cost, the salt comprises any one of formate, acetate, double salt, dehydroacetate and lactate or a mixture of any two or more of them in any proportion, and ammonium nitrate, ammonium sulfate, ammonium selenate, ammonium thiocyanate, ammonium carbonate, ammonium bicarbonate, potassium nitrite, potassium nitrate, potassium selenate, potassium thiocyanate, potassium thiosulfate, sodium chlorate, sodium nitrite, sodium perchlorate, cesium chlorate and cesium sulfate or a mixture of any two or more of them in any proportion is added.
Furthermore, in order to reduce the cost, the salt includes any one or a mixture of any two or more of ammonium nitrate, ammonium sulfate, ammonium selenate, ammonium thiocyanate, ammonium carbonate bicarbonate, potassium nitrite, potassium nitrate, potassium selenate, potassium thiocyanate, potassium thiosulfate, sodium chlorate, sodium nitrite, sodium perchlorate, cesium chlorate and cesium sulfate, and any one or a mixture of any two or more of formate, acetate, bis-acid salt, dehydroacetate and lactate is added.
Further, the ammonium salt includes any one of ammonium nitrate, ammonium sulfate, ammonium selenate, ammonium thiocyanate, ammonium carbonate and ammonium bicarbonate or a mixture of any two or more of the ammonium nitrate, the ammonium sulfate, the ammonium selenate, the ammonium thiocyanate and the ammonium carbonate and ammonium bicarbonate.
Furthermore, the nitrate of potassium, sodium and cesium, the nitrite of potassium, sodium and cesium, the carbonate of potassium, sodium and cesium, the chlorate of potassium, sodium and cesium, and the perchlorate of potassium, sodium and cesium, the bicarbonate of potassium, sodium and cesium includes any one of potassium nitrite, potassium nitrate, potassium selenate, potassium thiocyanate, potassium thiosulfate, sodium chlorate, sodium nitrite, sodium perchlorate, cesium chlorate and cesium sulfate, or a mixture of any two or more of them mixed in any proportion.
In the invention, because calcium and magnesium ions are easy to scale and the scaling tendency is aggravated when the calcium and magnesium ions are added into a shaft and a pipeline of a gas well, chemical agents containing calcium and magnesium, such as calcium chloride and magnesium chloride, are not suitable to be added into the shaft and the pipeline of the gas well; taking Dongsheng gas field as an example, the produced water is weakly acidic, so that the corrosion of a shaft can be slowed down by adding weakly alkaline ammonium salt; lithium salts and cobalt salts are expensive to manufacture and are not suitable for reducing the freezing point or the freezing point of a foaming agent.
Furthermore, in order to improve the stability of the foam, the cold-resistant foaming agent also comprises a thickening agent or/and a thickening agent solution with the weight percent of more than 0.01.
Furthermore, the weight content of the thickening agent in the thickening agent solution is more than 0.1 wt%.
Furthermore, the thickening agent comprises any one or a mixture of any two or more of sodium carboxymethyl cellulose, polyvinyl alcohol, polyvinylpyrrolidone, animal glue (such as gelatin), plant glue (such as sodium alginate), polysaccharide and water-soluble polymer.
The water-soluble polymer comprises any one or a mixture of any two or more of the following substances in any proportion: poly-N-vinylpyrrolidone, butyl derivatives of poly-N-vinylpyrrolidone, hydroxyethylcellulose, copolymers of N-vinylcaprolactam and N-vinylpyrrolidone, copolymers of acrylamide and maleimide, copolymers of N-vinylcaprolactam and maleimide, copolymers of methyl methacrylate, ethyl acrylate and isopropenyloxazoline, copolymers of N-vinylcaprolactam, N-vinylpyrrolidone and dimethylamino-1, 2-ethylene methacrylate, polyacrylamide, anionic polyacrylamide or cationic polyacrylamide.
In order to solve the first technical problem, the invention can also adopt the following technical scheme:
the invention relates to a cold-resistant foaming agent, which comprises the following substances:
1) 0.1-100 parts of a foaming agent;
2) 1-100 parts of alkali;
3) 1-100 parts of water.
Further, the invention relates to a cold-resistant foaming agent, which comprises the following substances:
1) 0.1-100 parts of foaming agent with water content more than 2%;
2) 1-100 parts of alkali or/and alkaline water.
Further, the invention relates to a cold-resistant foaming agent, which comprises the following substances:
1) 0.1-100 parts of foaming agent with water content more than 2%;
2) and 1-100 parts of saline-alkali mixture or/and saline-alkali water.
The alkaline water is an aqueous solution with a pH value of ≧ 8 or/and natural alkaline water.
Experiments show that the natural soda lake is abundant in China; the freezing point of the alkaline water is less than 0 ℃, such as the freezing point of a 3% sodium hydroxide aqueous solution is less than-2 ℃; the foaming agent and the alkaline water are mixed in any order and belong to solid-liquid or liquid-liquid mixing, and the foaming agent and the alkaline water are both mature technologies.
Further, the base is a substance capable of adjusting the pH of water to not less than 8.
Known from the knowledge in the art: the pH value of the produced water of the gas field is acidic, and the corrosivity of the produced water can be effectively reduced by adding alkali or alkaline water; gas wells, pipelines therefore allow the addition of alkaline or alkaline water.
The saline-alkali water is an aqueous solution of a saline-alkali mixture with a pH value of ≧ 8.
Further, the salt and alkali refers to a mixture of salt and alkali mixed in any ratio.
Known from the knowledge in the art: the domestic natural soda lake contains both salt and alkali and is an aqueous solution of a salt-alkali mixture; the trona produced by the trona lake is a saline-alkali mixture.
In order to solve the second technical problem, the invention adopts the following technical scheme:
the invention relates to an application method of a cold-resistant foaming agent, which comprises the following steps: the cold-resistant foaming agent is added into a gas well or/and an oil well.
Further, in order to make the cold-resistant foaming agent of the invention work better, the cold-resistant foaming agent of the invention is added into a casing or/and an oil pipe of a gas well, or the cold-resistant foaming agent of the invention is added into an oil layer through an oil well.
Furthermore, in order to save the dosage, the cold-resistant foaming agent is continuously added into the gas well casing or/and the oil pipe by using a metering pump or/and a pump with a flow metering device.
Further, in order to save the dosage, the cold-resistant foaming agent is continuously added into a gas well or/and an oil well by using an instillation tank; the drip tank is preferably a "device for facilitating dosing and adjustment of a medicament" as described in patent document ZL 201410003236.3.
Furthermore, the cold-resistant foaming agent is continuously added into a gas well or/and an oil well by a plurality of drip pots which are connected in parallel or/and in series; the drip tank is preferably a "device for facilitating dosing and adjustment of a medicament" as described in patent document ZL 201410003236.3.
Patent document ZL201410003236.3 discloses: the device for facilitating the metering and adjustment of the chemical agent can continuously add the chemical agent into a gas well casing or/and an oil pipe; because the cold-resistant foaming agent is not frozen and solidified, the cold-resistant foaming agent can be continuously added into a gas well casing or/and an oil pipe by using the device for conveniently metering and adjusting the medicament.
Further, in order to reduce dosing cost, the cold-resistant foaming agent is added into a gas well casing or/and an oil pipe through gas well inhibitor filling or/and methanol filling process equipment.
Known from the knowledge in the art: taking a big cattle land gas field as an example, when methanol is injected by adopting an alcohol injection process, a foaming agent is also injected by using the alcohol injection process, and the process can be summarized as follows: a dosing pipeline is arranged between the gas gathering station and the gas well, methanol is filled into the dosing pipeline for 1-30 days in the gas gathering station, then 2-200 rising foaming agents are filled into the dosing pipeline in the gas gathering station, and then methanol is filled into the dosing pipeline for 1-30 days; the above steps are repeated, and the methanol and the foaming agent in the dosing pipeline are sequentially added into the gas well. Thus, the cold resistant blowing agent of the present invention can be added to gas well casing or/and tubing using the dosing line.
Further, in order to better prevent freezing and solidification, the cold-resistant foaming agent is heated to be more than 20 ℃ or/and is insulated by using an insulating material, and then the cold-resistant foaming agent is added into a gas well or/and an oil well or a fire-fighting system.
From the thermodynamic common knowledge: the use of heat and temperature to prevent freezing and solidification of liquids is a well-established technique in the art. In order to solve the second technical problem, the invention adopts the following technical scheme:
the invention relates to an application method of a cold-resistant foaming agent, which comprises the following steps: the cold-resistant foaming agent is added into a gas well casing or/and an oil pipe through a charging bag.
The medicine adding bag comprises a container, a medicine adding opening, an upper valve, a lower valve and a medicine outlet pipe. The use of a charge to add a foaming agent to a gas well casing or/and tubing is well within the skill of the art.
In order to solve the second technical problem, the invention adopts the following technical scheme:
the invention relates to an application method of a cold-resistant foaming agent, which comprises the following steps: adding the cold-resistant foaming agent into a gas well casing or/and an oil pipe through a dosing device; the medicine adding device comprises a support, a closed container, a medicine supplementing valve, an emptying valve, a pressure leading valve, a medicine outlet valve, a medicine outlet pipeline and a pressure leading pipeline.
Furthermore, in order to measure the dosing flow, the dosing device further comprises a flowmeter.
Furthermore, in order to facilitate observing the liquid level and metering the dosing flow, the dosing device further comprises a liquid level meter.
Furthermore, the cold-resistant foaming agent is supplemented into the closed container of the dosing device by any one of a fixed pump, a movable pump and a vehicle-mounted pump of the dosing device.
In order to solve the second technical problem, the invention adopts the following technical scheme:
the invention relates to an application method of a cold-resistant foaming agent, which comprises the following steps: the cold-resistant foaming agent is added into a low-lying natural gas pipeline, so that accumulated liquid in the low-lying pipeline can be smoothly taken away by air flow.
Known from the knowledge in the art: in mountain areas with large topographic relief, the height difference of natural gas or coal bed gas pipelines is large, accumulated liquid in pipelines in low-lying areas of the topography is large, and accumulated liquid in the pipelines can be carried to a high place by using foam.
Any range recited herein is intended to include the endpoints and any number between the endpoints and any subrange subsumed therein or defined therein.
The substances of the present invention can be obtained by commercially available methods, and the apparatuses used in the present invention can be used by conventional apparatuses in the art or by referring to the prior art in the art, unless otherwise specified.
Compared with the prior art, the invention has the following beneficial effects:
the invention can effectively solve the problems of freezing and solidification of the foaming agent during outdoor storage and transportation, can effectively solve the problem of reducing the foaming effect of the foaming agent by using methanol, and can effectively solve the environmental protection problem caused by the methanol contained in the foaming agent; when the methanol-methanol composite foaming agent is used for oil gas production and drainage gas production, the problem of continuous dosing in winter can be effectively solved, and the problem of reducing the foaming effect of the foaming agent by using methanol can be effectively solved; has the advantages of easy implementation, wide application, easy popularization and the like.
Drawings
The following detailed description of embodiments of the invention is provided in connection with the accompanying drawings
FIG. 1 is a schematic view of the structure of a drug administration device in example 34;
fig. 2 is a schematic structural view of the drug administration device in example 35.
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.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings that is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and is therefore not to be construed as limiting the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Example 1
A cold resistant foaming agent comprising the following:
1) 0.1 part of sodium alkyl sulfate;
2) 1 part of potassium acetate;
3) and 1 part of water.
Known from the knowledge in the art: the alkyl sodium sulfate is dissolved in water and the dissolving process belongs to a mature technology; potassium acetate is dissolved in water and the dissolution process belongs to a mature technology; when the sodium alkyl sulfate is in a solid state, the mixing with potassium acetate and water in any order belongs to solid-liquid mixing, and belongs to the mature technology.
Known from the knowledge in the art: the water can generate a large amount of foam by extremely low foaming agent concentration, taking Dongsheng gas field J11P4H well as an example, 10 water producing formulas/day, the actual foaming agent dosage is 10 liters every other day, the maximum foaming agent concentration is 0.1 percent, the average concentration is only 0.05 percent, namely, the foaming agent dosage concentration of 0.05 percent meets the production requirement of the well; when the well is dosed with chemicals, the foaming agent needs to be diluted with water into 100 liters of foaming agent aqueous solution; therefore, the addition concentration range of the foaming agent is extremely wide.
The indoor test of this application shows: mixing 0.1 part of alkyl sodium sulfate, 1 part of potassium acetate and 1 part of water in any order to form a uniform liquid, thus preparing the cold-resistant foaming agent; further detection shows that: the freezing point of the cold-resistant foaming agent is lower than minus 10 ℃, and no ice, no solidification and no solid precipitation are generated in the outdoor environment at minus 10 ℃; therefore, the cold-resistant foaming agent has good cold resistance. Further laboratory tests show that: firstly adding 48ml of Dongsheng gas field produced water into 100ml of stoppered measuring cylinder, then adding 2ml of the cold-resistant foaming agent into 100ml of stoppered measuring cylinder, shaking up and down for 50 times, and standing, wherein the result shows that: the foaming height is more than 50ml, the foam half-life period is more than 5 minutes, and the total foam breaking time is more than 30 minutes; therefore, the cold-resistant foaming agent has good foaming effect and foaming capacity; the embodiment meets the production requirements of the Dongsheng gas field.
Example 2
A cold resistant foaming agent comprising the following:
1) 100 parts of sodium alkylsulfonate;
2) 100 parts of urea;
3) 100 parts of water.
The test shows that: mixing 100 parts of alkyl sodium sulfonate, 100 parts of urea and 100 parts of water in any order to obtain a uniform liquid, thus obtaining the cold-resistant foaming agent; further detection shows that: the freezing point of the cold-resistant foaming agent is lower than minus 5 ℃, and no ice, no solidification and no solid precipitation are generated in the outdoor environment at minus 5 ℃; therefore, the cold-resistant foaming agent has good cold resistance. Further laboratory tests show that: firstly adding 48ml of Dongsheng gas field produced water into 100ml of stoppered measuring cylinder, then adding 2ml of the cold-resistant foaming agent into 100ml of stoppered measuring cylinder, shaking up and down for 50 times, and standing, wherein the result shows that: the foaming height is more than 50ml, the foam half-life period is more than 5 minutes, and the total foam breaking time is more than 30 minutes; therefore, the cold-resistant foaming agent has good foaming effect and foaming capacity; the embodiment meets the production requirements of the Dongsheng gas field.
Example 3
A cold resistant foaming agent comprising the following:
1) OP-100.1 parts;
2) 100 parts of potassium nitrite;
3) 100 parts of water.
The test shows that: the saturated solubility of the potassium nitrite at 0 ℃ is 279g (corresponding to the weight concentration of 73.6 percent at 0 ℃), the freezing point of the cold-resistant foaming agent is lower than-35 ℃, no freezing, no solidification and no solid precipitation can be caused in the outdoor environment at-35 ℃, and the foaming agent has good foaming effect and foaming capacity at-35 ℃; the embodiment meets the production requirements of the Dongsheng gas field.
Test comparative example A
A cold resistant foaming agent comprising the following:
1) OP-100.1 parts;
2) 100 parts of potassium chloride;
3) 100 parts of water.
The test shows that: the saturated solubility of potassium chloride at 0 ℃ is 28g (corresponding to a weight concentration of 21.8% at 0 ℃), the cold-resistant foaming agent of the present example has a potassium chloride concentration at 0 ℃ that is greater than its saturated solubility, a large number of potassium chloride crystals have precipitated at 0 ℃, the freezing point of which is already above 0 ℃ and has caused the cold-resistant foaming agent of the present example to freeze and solidify; the present example does not meet the production requirements of the Dongsheng gas field.
Test comparative example B
A cold resistant foaming agent comprising the following:
1) OP-100.1 parts;
2) 100 parts of sodium chloride;
3) 100 parts of water.
The test shows that: the saturated solubility of sodium chloride at 0 ℃ is 35.7g (corresponding to a weight concentration of 26.3% at 0 ℃), the cold-resistant foaming agent of the embodiment has a sodium chloride concentration at 0 ℃ that is greater than the saturated solubility, a large number of potassium chloride crystals have been precipitated at 0 ℃, the freezing point of the potassium chloride crystals is higher than 0 ℃ and the freezing solidification of the cold-resistant foaming agent of the embodiment is caused; the present example does not meet the production requirements of the Dongsheng gas field.
Example 4
Example 1 was repeated, except that it included the following:
Figure BDA0001817459140000151
the test shows that: the cold-resistant foaming agent has good foaming effect and foaming capacity at-2 ℃; the embodiment meets the production requirements of the Dongsheng gas field.
Example 5
Example 1 was repeated, except that it included the following:
1) 100 parts of dodecyl benzyl dimethyl ammonium chloride;
2) 100 parts of potassium nitrate;
3) and 1 part of water.
The test shows that: the cold-resistant foaming agent has good foaming effect and foaming capacity at-10 ℃; the embodiment meets the production requirements of the Dongsheng gas field.
Example 6
Example 1 was repeated, except that it included the following:
1) 50 parts of sodium dodecyl benzene sulfonate;
2) 20 parts of potassium lactate;
3) 50 parts of water.
The test shows that: the cold-resistant foaming agent has good foaming effect and foaming capacity at-15 ℃; the embodiment meets the production requirements of the Dongsheng gas field.
Example 7
Example 1 was repeated, except that it included the following:
1) 10 parts of sodium dodecyl benzene sulfonate;
2) 40 parts of potassium carbonate;
3) and 30 parts of water.
The test shows that: the cold-resistant foaming agent has good foaming effect and foaming capacity at-15 ℃; the embodiment meets the production requirements of the Dongsheng gas field.
Example 8
Example 1 was repeated, except that it included the following:
Figure BDA0001817459140000161
the test shows that: the cold-resistant foaming agent has good foaming effect and foaming capacity at-10 ℃; the embodiment meets the production requirements of the Dongsheng gas field.
Example 9
Example 1 was repeated, except that it included the following:
1) 0.1 part of sophorolipid with the water content of 20 percent;
2) 1 part of water solution with 10 percent of potassium formate content.
The test shows that: the cold-resistant foaming agent has good foaming effect and foaming capacity at-10 ℃; the embodiment meets the production requirement of the Dongsheng gas field
Example 10
Example 1 was repeated, except that it included the following:
1) 50 parts of sodium alkyl alcohol sulfate with the water content of 10 percent;
2) sodium dodecyl benzene sulfonate 50
3) 100 parts of ammonium bicarbonate water.
The test shows that: the cold-resistant foaming agent has good foaming effect and foaming capacity at-12 ℃; the embodiment meets the production requirement of the Dongsheng gas field
Example 11
Example 1 was repeated, except that it included the following:
Figure BDA0001817459140000171
the test shows that: the cold-resistant foaming agent has good foaming effect and foaming capacity at-14 ℃; the embodiment meets the production requirement of the Dongsheng gas field
Example 12
Example 1 was repeated, except that it included the following:
Figure BDA0001817459140000172
the test shows that: the cold-resistant foaming agent has good foaming effect and foaming capacity at-15 ℃; the embodiment meets the production requirement of the Dongsheng gas field
Example 13
Examples 1 to 12 were repeated, except that more than 0.01% by weight of thickener or/and thickener solution was also added.
The thickening agent in the thickening agent solution in this embodiment has a weight content of greater than 0.1 wt%.
The thickening agent in this embodiment refers to any one of sodium carboxymethyl cellulose, polyvinyl alcohol, polyvinylpyrrolidone, animal glue (such as gelatin), vegetable glue (such as sodium alginate), polysaccharide, and water-soluble polymer, or a mixture of any two or more of them in any proportion.
The water-soluble polymer in this embodiment is a mixture of any one or two or more of the following substances in any ratio: poly-N-vinylpyrrolidone, butyl derivatives of poly-N-vinylpyrrolidone, hydroxyethylcellulose, copolymers of N-vinylcaprolactam and N-vinylpyrrolidone, copolymers of acrylamide and maleimide, copolymers of N-vinylcaprolactam and maleimide, copolymers of methyl methacrylate, ethyl acrylate and isopropenyloxazoline, copolymers of N-vinylcaprolactam, N-vinylpyrrolidone and dimethylamino-1, 2-ethylene methacrylate, polyacrylamide, anionic polyacrylamide or cationic polyacrylamide.
The test shows that: mixing 100 parts of alkyl sodium sulfonate, 100 parts of cane sugar and 100 parts of water in any order to obtain a uniform liquid, thus obtaining the cold-resistant foaming agent; then 0.1g of sodium alginate is added into the cold-resistant foaming agent and mixed into uniform liquid; further laboratory tests show that: firstly adding 48ml of Dongsheng gas field produced water into 100ml of stoppered measuring cylinder, then adding 2ml of the cold-resistant foaming agent into 100ml of stoppered measuring cylinder, shaking up and down for 50 times, and standing, wherein the result shows that: the foaming height of the foam exceeds 50ml, the half-life period of the foam exceeds 8 minutes, and the total foam breaking time exceeds 50 minutes; therefore, the sodium alginate can effectively improve the foam stability of the cold-resistant foaming agent.
Example 14
The invention relates to a cold-resistant foaming agent, which comprises the following substances:
1) 0.1 part of sodium alkylsulfonate;
2) 1 part of sodium hydroxide;
3) and 1 part of water.
Known from the knowledge in the art: the pH value of the produced water of the gas field is acidic, and the corrosivity of the produced water can be effectively reduced by adding alkali or alkaline water; gas wells, pipelines therefore allow the addition of alkaline or alkaline water.
The test shows that: mixing 0.1 part of sodium alkyl sulfonate, 1 part of sodium hydroxide and 1 part of water in any order to form uniform liquid, thus obtaining the cold-resistant foaming agent; further tests show that: firstly adding 48ml of Dongsheng gas field produced water into 100ml of stoppered measuring cylinder, then adding 2ml of the cold-resistant foaming agent into 100ml of stoppered measuring cylinder, shaking up and down for 50 times, and standing, wherein the result shows that: the foaming height of the foam exceeds 50ml, the half-life period of the foam exceeds 8 minutes, and the total foam breaking time exceeds 50 minutes; therefore, the cold-resistant foaming agent has good foaming effect and foaming capacity; meets the production requirements of Dongsheng gas fields.
Example 15
Example 14 was repeated, except that it included the following:
1) 100 parts of dodecyl benzyl dimethyl ammonium chloride;
2) 100 parts of potassium hydroxide;
3) 100 parts of water.
The test shows that: the cold-resistant foaming agent has good foaming effect and foaming capacity at the temperature of-20 ℃; the embodiment meets the production requirements of the Dongsheng gas field.
Example 16
Example 14 was repeated, except that it included the following:
Figure BDA0001817459140000181
Figure BDA0001817459140000191
the test shows that: the cold-resistant foaming agent has good foaming effect and foaming capacity at-15 ℃; the embodiment meets the production requirements of the Dongsheng gas field.
Example 17
Example 14 was repeated, except that it included the following:
Figure BDA0001817459140000192
the test shows that: the cold-resistant foaming agent has good foaming effect and foaming capacity at the temperature of-5 ℃; the embodiment meets the production requirements of the Dongsheng gas field.
Example 18
Example 14 was repeated, except that it included the following:
1) 1 part of sodium dodecyl benzene sulfonate;
2) 1 part of potassium hydroxide;
3) 100 parts of water.
The test shows that: the cold-resistant foaming agent has good foaming effect and foaming capacity at-2 ℃; the embodiment meets the production requirements of the Dongsheng gas field.
Example 19
Example 14 was repeated, except that it included the following:
1) 30 parts of sophorolipid;
2) 10 parts of trona;
3) and 40 parts of water.
The test shows that: the cold-resistant foaming agent has good foaming effect and foaming capacity at-10 ℃; the embodiment meets the production requirements of the Dongsheng gas field.
Example 20
The invention relates to a cold-resistant foaming agent, which comprises the following substances:
1) 0.1 part of sophorolipid with the water content of more than 25 percent;
2) 1 part of natural alkaline water with 9 percent of sodium carbonate content.
Known from the knowledge in the art: the domestic environment is rich in trona lakes and trona water; the freezing point of the natural alkaline water is less than 0 ℃.
The test shows that: the cold-resistant foaming agent has good foaming effect and foaming capacity at the temperature of-5 ℃; the embodiment meets the production requirements of the Dongsheng gas field.
Example 21
Example 14 was repeated, except that it included the following:
1) 100 parts of sodium dodecyl benzene sulfonate with the water content of 12 percent;
2) 100 parts of sodium hydroxide aqueous solution with the water content of 18 percent.
The test shows that: the cold-resistant foaming agent has good foaming effect and foaming capacity at-10 ℃; the embodiment meets the production requirements of the Dongsheng gas field.
Example 22
Example 14 was repeated, except that it included the following:
1) polyoxyethylene alkyl alcohol ether with the water content of 9 percent-20100 parts;
2) 1 part of sodium hydroxide aqueous solution with the water content of 30 percent.
The test shows that: the cold-resistant foaming agent has good foaming effect and foaming capacity at-10 ℃; the embodiment meets the production requirements of the Dongsheng gas field.
Example 23
Example 14 was repeated, except that it included the following:
1) 30 parts of sodium dodecyl benzene sulfonate with the water content of 12 percent;
2) 50 portions of trona containing 5 percent of sodium chloride and 15 percent of soda ash.
Known from the knowledge in the art: the domestic natural soda lake contains salt and alkali, and is an aqueous solution of a saline-alkali mixture; the trona produced by the trona lake is a saline-alkali mixture.
The test shows that: the cold-resistant foaming agent has good foaming effect and foaming capacity at-10 ℃; the embodiment meets the production requirements of the Dongsheng gas field.
Example 24
Example 14 was repeated, except that it included the following:
1) 20 parts of sodium dodecyl benzene sulfonate with the water content of 32 percent;
2) 10 parts of a mixture of 5% of sodium hydroxide and 20% of trona.
The test shows that: the cold-resistant foaming agent has good foaming effect and foaming capacity at-10 ℃; the embodiment meets the production requirements of the Dongsheng gas field.
Example 25
Example 14 was repeated, except that it included the following:
1) 60 parts of sophorolipid with the water content of 22 percent;
2) 40 parts of a mixture of 5% sodium hydroxide and 10% potassium hydroxide.
The test shows that: the cold-resistant foaming agent has good foaming effect and foaming capacity at the temperature of-5 ℃; the embodiment meets the production requirements of the Dongsheng gas field.
Example 26
The invention relates to an application method of a cold-resistant foaming agent, which comprises the following steps: the cold-resistant foaming agent of any of examples 1-25 is added to a gas or/and oil well.
Example 27
The invention relates to an application method of a cold-resistant foaming agent, which comprises the following steps: the cold-resistant foaming agent of any of examples 1-25 is added to a gas well casing or/and tubing or the cold-resistant foaming agent of the present invention is added to an oil formation through an oil well.
Example 28
The invention relates to an application method of a cold-resistant foaming agent, which comprises the following steps: : the cold-resistant foaming agent described in any of examples 1-25 is continuously added to the casing or/and tubing of a gas well by means of a metering pump or/and a pump with a flow metering device.
Known from the knowledge in the art: the method of adding methanol and foaming agent into gas well casing and/or oil pipe and ground pipeline with fixed metering pump and/or high pressure pump belongs to the field of technology.
Example 29
The invention relates to an application method of a cold-resistant foaming agent, which comprises the following steps: continuously adding the cold-resistant foaming agent of any one of the embodiments 1-25 into a gas well or/and an oil well by using an instillation tank; the drip tank is preferably a "device for facilitating dosing and adjustment of a medicament" as described in patent document ZL 201410003236.3.
Example 30
The application method of the cold-resistant foaming agent comprises the following steps: continuously adding the cold-resistant foaming agent in any one of the embodiments 1-25 into a gas well or/and an oil well by using a plurality of drip pots which are connected in parallel or/and in series; the drip tank is referred to as "a device for facilitating the metering and adjustment of a medicament" described in patent document ZL 201410003236.3.
It is known from patent document ZL 201410003236.3: the device for facilitating the metering and adjustment of the chemical agent can continuously add the chemical agent into a gas well casing or/and an oil pipe; because the cold-resistant foaming agent is not frozen and solidified, the cold-resistant foaming agent can be continuously added into a gas well casing or/and an oil pipe by using the device for conveniently metering and adjusting the medicament.
Example 31
The application method of the cold-resistant foaming agent comprises the following steps: the cold-resistant blowing agent of any of examples 1-25 is added to a gas well casing or/and tubing via gas well injection inhibitor or/and methanol process equipment.
Known from the knowledge in the art: taking a big cattle land gas field as an example, when methanol is injected by adopting an alcohol injection process, a foaming agent is also injected by using the alcohol injection process, and the process can be summarized as follows: a dosing pipeline is arranged between the gas gathering station and the gas well, methanol is filled into the dosing pipeline for 1-30 days in the gas gathering station, then 2-200 rising foaming agents are filled into the dosing pipeline in the gas gathering station, and then methanol is filled into the dosing pipeline for 1-30 days; the above steps are repeated, and the methanol and the foaming agent in the dosing pipeline are sequentially added into the gas well. Thus, the cold resistant foaming agent of the present invention can be added to the gas well casing or/and tubing using the dosing line.
Example 32
The application method of the cold-resistant foaming agent comprises the following steps: the cold-resistant blowing agent of any of examples 1-25 is first heated to above 20 ℃ or/and insulated with an insulating material and then added to a gas well or/and an oil well or a fire protection system.
From the thermodynamic common knowledge: the use of heat and temperature to prevent freezing and solidification of liquids is a well-established technique in the art.
Example 33
The application method of the cold-resistant foaming agent comprises the following steps: the cold resistant foaming agent of any of examples 1-25 is added to the gas well casing or/and tubing via a charge.
The medicine adding bag comprises a container, a medicine adding opening, a container upper valve, a container lower valve and a medicine outlet pipe.
Known from the knowledge in the art: the chemical adding bag belongs to the mature technology in the field and is generally used for adding chemical agents into gas wells or oil wells and pipelines; the method for adding methanol and foaming agent into gas well casing or/and oil pipe and ground pipeline by using charge is the mature technology in the field.
Example 34
The application method of the cold-resistant foaming agent comprises the following steps: the cold-resistant foaming agent of any of examples 1-25 is added to the gas well tubing or/and casing by a dosing device.
The medicine adding device comprises a support, a container, a medicine supplementing valve, an emptying valve, a pressure guiding valve, a medicine outlet valve, a medicine outlet pipeline and a pressure guiding pipeline.
Referring to fig. 1, a closed container 101 is arranged on a bracket 100 of the drug adding device according to the embodiment; a medicine replenishing valve 102, an emptying valve 103 and a pressure guiding valve 104 are arranged at the upper part of the closed container 101, and a medicine outlet 105 is arranged at the lower part or the bottom of the closed container 101; a medicine outlet valve 106 is arranged on the medicine outlet 105; the medicine outlet valve 106 is connected with one end of a medicine outlet pipeline 107; the other end of the medicine outlet pipeline 107 is connected with a casing valve 108 of a gas well 109; a bleed valve 110 of the gas well 109 is connected to the bleed valve 104 at the upper part of the closed vessel 101 via a bleed line 111.
Description of the working principle: emptying and replenishing the medicine: closing the medicine outlet valve 106 and the pressure guide valve 104, and opening the vent valve 103 to vent the natural gas in the closed container 101; then adding the cold-resistant foaming agent into a closed container 101 through a medicine supplementing valve 102, and closing an emptying valve 103; opening a pressure-leading valve 104, and allowing natural gas in the gas well 109 to enter the closed container 101 through a pressure-leading valve 110 and a pressure-leading pipeline 111 to balance the pressure in the closed container 101 with the pressure in the gas well 109; because the height of the closed container 101 after being raised by the bracket 100 is higher than that of the sleeve valve 108, after the medicine outlet valve 106 is opened, the cold-resistant foaming agent in the closed container 101 sequentially passes through the medicine outlet 105, the medicine outlet valve 106, the medicine outlet pipeline 107 and the sleeve valve 108 under the action of gravity and enters the gas well 109.
Non-emptying (under pressure) medicine supplementing process: firstly, connecting a high-pressure pump or a metering pump with a drug replenishing valve 102 by using a pipeline; then opening a medicine supplementing valve 102, adding the cold-resistant foaming agent into the closed container 101 through the medicine supplementing valve 102 by using a pump, simultaneously returning part of natural gas in the closed container 101 to the gas well 109 through an air leading valve 110 and a pressure leading pipeline 111, and continuously balancing the pressure in the closed container 101 with the pressure in the gas well 109; then the medicine supplementing valve 102 is closed, and the cold-resistant foaming agent in the closed container 101 sequentially enters the medicine outlet 105, the medicine outlet valve 106, the medicine outlet pipeline 107 and the casing valve 108 into the gas well 109 under the action of gravity generated by altitude difference.
Preferably, the medicine outlet pipeline and the pressure guide pipeline of the medicine adding device are high-pressure hoses.
Example 35
Example 34 is repeated with the difference that the dosing device further comprises a flow meter.
Referring to fig. 2, a flow meter 208 is disposed on the drug outlet line 207 of the drug adding device according to the present embodiment.
Description of the working principle: the medicine adding flow in the medicine outlet pipeline 207 can be obtained through the flowmeter 208; the opening of the medicine outlet valve 206 is adjusted, and the medicine adding flow can be adjusted.
Example 36
34-35 are repeated, except that the dosing device further comprises a liquid level meter.
Known from the knowledge in the art: the liquid level meter is set on the closed container and high pressure container.
Example 37
Examples 34-36 were repeated except that the applicator was supplemented with any of the cold-resistant foaming agents of examples 1-25 using any of the fixed, mobile, and vehicle-mounted pumps.
Known from the knowledge in the art: a method for adding liquid into a container and a high-pressure closed container by using a fixed pump, a movable pump or a vehicle-mounted pump belongs to the mature technology.
Example 38
The application method of the cold-resistant foaming agent comprises the following steps: the cold-resistant foaming agent of any of examples 1-25 is added to a low-lying natural gas pipeline so that the gas flow can smoothly carry away the accumulated liquid in the low-lying pipeline.
Known from the knowledge in the art: in mountain areas with large topographic relief, the height difference of natural gas or coal bed gas pipelines is large, accumulated liquid in pipelines in low-lying areas of the topography is large, and accumulated liquid in the pipelines can be carried to a high place by using foam.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. Not all embodiments are exhaustive. All obvious changes and modifications which are obvious to the technical scheme of the invention are covered by the protection scope of the invention.

Claims (41)

1. A cold-resistant foaming agent, which is characterized in that; it comprises the following substances:
1) 0.1-100 parts of a foaming agent;
2) 1-100 parts of salt or/and urea or/and sugar;
3) 1-100 parts of water.
2. The cold-resistant foaming agent as claimed in claim 1, wherein: the sugar comprises any one of sucrose, fructose and lactose or a mixture of any two or more of sucrose, fructose and lactose in any proportion.
3. The cold-resistant foaming agent as claimed in claim 1, wherein: it comprises the following substances:
1) 0.1-100 parts of foaming agent with water content more than 2%;
2) 1-100 parts of salt or/and brine.
4. The cold-resistant foaming agent as claimed in claim 3, wherein: the foaming agent with the water content of more than 2 percent is liquid at normal temperature and normal pressure.
5. The cold-resistant foaming agent as claimed in claim 3, wherein: the saline water refers to an aqueous solution of salt having a salt content of more than 2%.
6. The cold-resistant foaming agent as claimed in any one of claims 1, 3 and 5, wherein: the salt comprises an organic salt; the organic salt comprises any one of formate, acetate, double salt, dehydroacetate and lactate or a mixture of any two or more of formate, acetate, double salt, dehydroacetate and lactate in any proportion;
preferably, the salt also comprises any one or a mixture of any two or more of the following substances mixed in any proportion: ammonium salts, nitrates of potassium, sodium and cesium, nitrites of potassium, sodium and cesium, carbonates of potassium, sodium and cesium, chlorates of potassium, sodium and cesium, perchlorates of potassium, sodium and cesium, bicarbonates of potassium, sodium and cesium, zinc nitrate, zinc chlorate, manganese nitrate.
7. The cold-resistant foaming agent as claimed in claim 6, wherein: the formate comprises formate of potassium, sodium, rubidium and cesium; the acetate comprises potassium, sodium, rubidium and cesium acetate.
8. The cold-resistant foaming agent as claimed in claim 6, wherein: the double-acid salt comprises any one of potassium diformate, potassium diacetate, sodium diformate, sodium diacetate, rubidium diformate, rubidium diacetate, cesium diformate and cesium diacetate or a mixture of any more than two of the potassium diformate, the potassium diacetate, the sodium diformate, the sodium diacetate, the rubidium diformate, the rubidium diacetate, the cesium diformate and the cesium diacetate.
9. The cold-resistant foaming agent as claimed in claim 6, wherein: the dehydroacetic acid salt comprises one or a mixture of any two or more of potassium dehydroacetate, sodium dehydroacetate, rubidium dehydroacetate, cesium dehydroacetate and ammonium dehydroacetate in any proportion.
10. The cold-resistant foaming agent as claimed in claim 6, wherein: the lactate comprises any one of potassium lactate, sodium lactate, rubidium lactate, cesium lactate, calcium lactate and ammonium lactate or a mixture of any two of the above in any proportion.
11. The cold-resistant foaming agent as claimed in any one of claims 1, 3 and 5, wherein: the salt refers to any one or a mixture of any two or more of the following substances in any proportion: ammonium salts, nitrates of potassium, sodium and cesium, nitrites of potassium, sodium and cesium, carbonates of potassium, sodium and cesium, chlorates of potassium, sodium and cesium, perchlorates of potassium, sodium and cesium, bicarbonates of potassium, sodium and cesium, zinc nitrate, zinc chlorate, manganese nitrate.
12. The cold-resistant foaming agent as claimed in any one of claims 1, 3 and 5, wherein: the salt comprises any one of formate, acetate, double salt, dehydroacetate and lactate or a mixture formed by any two or more of formate, acetate, double salt, dehydroacetate and lactate in any proportion, and is added with any one of ammonium nitrate, ammonium sulfate, ammonium selenate, ammonium thiocyanate, ammonium carbonate, ammonium bicarbonate, potassium nitrite, potassium nitrate, potassium selenate, potassium thiocyanate, potassium thiosulfate, sodium chlorate, sodium nitrite, sodium perchlorate, cesium chlorate and cesium sulfate or a mixture formed by any two or more of cesium sulfate in any proportion.
13. The cold-resistant foaming agent as claimed in any one of claims 1, 3 and 5, wherein: the salt comprises any one or a mixture of any more than two of ammonium nitrate, ammonium sulfate, ammonium selenate, ammonium thiocyanate, ammonium carbonate and ammonium bicarbonate, potassium nitrite, potassium nitrate, potassium selenate, potassium thiocyanate, potassium thiosulfate, sodium chlorate, sodium nitrite, sodium perchlorate, cesium chlorate and cesium sulfate in any proportion, and any one or a mixture of any more than two of formate, acetate, double salt, dehydroacetate and lactate in any proportion is added.
14. The cold-resistant foaming agent as claimed in claim 6 or 11, wherein: the ammonium salt refers to any one or a mixture of any two or more of ammonium nitrate, ammonium sulfate, ammonium selenate, ammonium thiocyanate, ammonium carbonate and ammonium bicarbonate in any proportion.
15. The cold-resistant foaming agent as claimed in claim 6 or 11, wherein: the nitrate of potassium, sodium and cesium, the nitrite of potassium, sodium and cesium, the carbonate of potassium, sodium and cesium, the chlorate of potassium, sodium and cesium, and the perchlorate of potassium, sodium and cesium, wherein the bicarbonate of potassium, sodium and cesium comprises any one or a mixture of more than two of potassium nitrite, potassium nitrate, potassium selenate, potassium thiocyanate, potassium thiosulfate, sodium chlorate, sodium nitrite, sodium perchlorate, cesium chlorate and cesium sulfate in any proportion.
16. A cold-resistant foaming agent, which is characterized in that; it comprises the following substances:
1) 0.1-100 parts of a foaming agent;
2) 1-100 parts of alkali;
3) 1-100 parts of water.
17. The cold-resistant foaming agent as claimed in claim 16, wherein: it comprises the following substances:
1) 0.1-100 parts of foaming agent with water content more than 2%;
2) 1-100 parts of alkali or/and alkaline water.
18. The cold-resistant foaming agent as claimed in claim 16, wherein: it comprises the following substances:
1) 0.1-100 parts of foaming agent with water content more than 2%;
2) and 1-100 parts of saline-alkali mixture or/and saline-alkali water.
19. A cold-resistant foaming agent according to any of claims 16 to 18 wherein: the alkaline water refers to water solution with pH value ≧ 8 or/and natural alkaline water.
20. A cold-resistant foaming agent according to any of claims 15 to 19 wherein: the alkali is a substance capable of adjusting the pH value of water to ≧ 8.
21. The cold-resistant foaming agent as claimed in claim 18, wherein: the saline-alkali water is an aqueous solution of a saline-alkali mixture with the pH value being not less than 8.
22. The cold-resistant foaming agent as claimed in claim 18 and 21, wherein: the saline-alkali refers to a mixture of salt and alkali mixed in any proportion.
23. The cold-resistant foaming agent of any one of claims 1, 3-4, 16-18 wherein: the foaming agent is any one or a mixture of any two or more of an anionic surfactant, a cationic surfactant, a nonionic surfactant, an amphoteric surfactant, a high molecular surfactant and a biosurfactant which are mixed in any proportion.
24. The cold-resistant foaming agent of any one of claims 1, 3-4, 16-18 wherein: it also comprises the addition of more than 0.01 wt% of thickening agent or/and thickening agent solution.
25. The cold-resistant foaming agent as claimed in claim 24, wherein: the thickening agent content in the thickening agent solution is more than 0.1 wt%.
26. The cold-resistant foaming agent according to any one of claims 24 to 25 wherein: the thickening agent is any one or a mixture of any two or more of sodium carboxymethyl cellulose, polyvinyl alcohol, polyvinylpyrrolidone, animal gum, vegetable gum, polysaccharide and water-soluble polymer.
27. The cold-resistant foaming agent as claimed in claim 26, wherein: the water-soluble polymer is a mixture of any one or more than two of the following substances in any proportion: poly-N-vinylpyrrolidone, butyl derivatives of poly-N-vinylpyrrolidone, hydroxyethylcellulose, copolymers of N-vinylcaprolactam and N-vinylpyrrolidone, copolymers of acrylamide and maleimide, copolymers of N-vinylcaprolactam and maleimide, copolymers of methyl methacrylate, ethyl acrylate and isopropenyloxazoline, copolymers of N-vinylcaprolactam, N-vinylpyrrolidone and dimethylamino-1, 2-ethylene methacrylate, polyacrylamide, anionic polyacrylamide or cationic polyacrylamide.
28. An application method of a cold-resistant foaming agent is characterized in that; it comprises the following steps: the cold-resistant foaming agent is added into a gas well or/and an oil well.
29. The application method of the cold-resistant foaming agent as claimed in claim 28, wherein the foaming agent comprises the following steps: it comprises the following steps: the cold-resistant foaming agent is added into a gas well casing or/and an oil pipe, or is added into an oil layer through an oil well.
30. The application method of the cold-resistant foaming agent as claimed in claim 28, wherein the foaming agent comprises the following steps: it comprises the following steps: continuously adding the cold-resistant foaming agent as claimed in any one of claims 1-27 into a gas well casing or/and tubing by using a metering pump or/and a pump with a flow metering device.
31. The application method of the cold-resistant foaming agent as claimed in claim 28, wherein the foaming agent comprises the following steps: it comprises the following steps: continuously adding the cold-resistant foaming agent of any of claims 1-27 to a gas or/and oil well using a drip tank; the drip chamber is preferably "a device for facilitating dosing and adjustment of a medicament" as described in patent document ZL 201410003236.3.
32. The application method of the cold-resistant foaming agent as claimed in claim 31, wherein the application method comprises the following steps: it comprises the following steps: continuously feeding the cold-resistant foaming agent of any of claims 1-27 into a gas or/and oil well using a plurality of drip tanks connected in parallel or/and in series; the drip chamber is preferably "a device for facilitating dosing and adjustment of a medicament" as described in patent document ZL 201410003236.3.
33. The application method of the cold-resistant foaming agent as claimed in claim 28, wherein the foaming agent comprises the following steps: it comprises the following steps: the cold-resistant blowing agent of any of claims 1-27 added to gas well casings or/and tubing via gas well flooding inhibitor or/and methanol process equipment.
34. The use of a cold-resistant foaming agent as claimed in claims 28 to 33 wherein: it comprises the following steps: the cold resistant blowing agent of any of claims 1-27 heated to above 20 ℃ or/and insulated with insulation prior to introduction into a gas or/and oil well or fire protection system.
35. An application method of a cold-resistant foaming agent is characterized in that; it comprises the following steps: a cold resistant foaming agent as claimed in any of claims 1 to 27 added to gas well casings or/and tubing by a kit.
36. The application method of the cold-resistant foaming agent as claimed in claim 35, wherein the foaming agent comprises the following components: the medicine adding bag comprises a container, a medicine adding opening, an upper valve, a lower valve and a medicine outlet pipe.
37. The application method of the cold-resistant foaming agent is characterized by comprising the following steps: adding the cold-resistant foaming agent as defined in any one of claims 1 to 27 into a gas well casing or/and tubing via a dosing device; the medicine adding device comprises a support, a closed container, a medicine supplementing valve, an emptying valve, a pressure leading valve, a medicine outlet valve, a medicine outlet pipeline and a pressure leading pipeline.
38. The application method of the cold-resistant foaming agent as claimed in claim 37, wherein the foaming agent comprises the following steps: the dosing device further comprises a flow meter.
39. The use of a cold-resistant foaming agent as claimed in any of claims 37 to 38 wherein: the medicine adding device further comprises a liquid level meter.
40. The use of a cold-resistant foaming agent as claimed in any of claims 37 to 38 wherein: the drug adding device is supplemented with the cold-resistant foaming agent in any one of claims 1 to 27 in a closed container of the drug adding device by using a pump in any one form of a fixed pump, a movable pump and a vehicle-mounted pump.
41. An application method of a cold-resistant foaming agent is characterized in that; it comprises the following steps: the cold-resistant foaming agent of any of claims 1 to 27 is added to a low-lying natural gas pipeline so that the gas flow smoothly carries away the accumulated liquid in the low-lying pipeline.
CN201811148849.8A 2018-09-29 2018-09-29 Cold-resistant foaming agent and application method thereof Pending CN110964488A (en)

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CN111764878A (en) * 2020-07-07 2020-10-13 成都立联科能源科技有限公司 Nano-foam lifting liquid drainage gas production rod and preparation method and application thereof
CN113559782A (en) * 2021-07-09 2021-10-29 李晟贤 Antifreezing foaming agent and application method thereof
CN113578081A (en) * 2021-07-27 2021-11-02 浙江大学 Surfactant stabilization-based nanobubble and preparation method thereof

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