CN110105942B - Wax remover and preparation method and application thereof - Google Patents
Wax remover and preparation method and application thereof Download PDFInfo
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- CN110105942B CN110105942B CN201810101020.6A CN201810101020A CN110105942B CN 110105942 B CN110105942 B CN 110105942B CN 201810101020 A CN201810101020 A CN 201810101020A CN 110105942 B CN110105942 B CN 110105942B
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Abstract
The invention provides a paraffin remover and a preparation method and application thereof, wherein the paraffin remover comprises the following components in percentage by weight: 0.1-3% of ethylene-vinyl acetate copolymer, 1-2% of dichloroethane, 0.5-0.8% of polyacrylate, 1-2% of styrene, 0.1-0.5% of dispersant, 0.1-0.3% of penetrating agent, 0.1-1% of pour point depressant and the balance of carbon nonaromatic hydrocarbon. The method is used for solving the technical defect that blockage of the ultra-deep condensate gas well is difficult to clear in the prior art.
Description
Technical Field
The invention belongs to the technical field of oilfield exploitation, and particularly relates to a paraffin remover as well as a preparation method and application thereof.
Background
In the middle and later stages of oil field development, when the local temperature and pressure exceed critical conditions, the gas generated by the reverse evaporation of liquid hydrocarbons is called condensate gas. The condensate gas has the characteristics of complex phase state and flow characteristics, particularly the continental facies sedimentary reservoir has the characteristics of low porosity, low permeability, strong heterogeneity, easy occurrence of a reverse condensation phenomenon on the stratum, easy liquid locking and the like, and the exploitation difficulty is high.
In the development process, as the formation pressure is continuously reduced, the heavy hydrocarbon in the condensate gas can generate phase change, condensate oil is separated out from the formation, and a gas-liquid two-phase is formed. Once produced, the oil is reverse condensed into light oil, namely condensate oil, due to the reduction of surface pressure and temperature. The condensate gas is a mixture of petroleum dissolved in natural gas under high temperature and high pressure conditions. The condensate gas is located in rocks several kilometers deep underground, and the main products obtained by development are condensate oil and natural gas.
Therefore, in the condensate gas well, due to the reduction of temperature and pressure, heavy components such as paraffin can be separated out from the natural or condensate oil, so that the oil conveying pipe column is blocked, and the oil field production is seriously affected.
At present, no good method is available for paraffin removal of condensate wells, and blockage removal is difficult especially for ultra-deep condensate wells.
Disclosure of Invention
Aiming at the defects, the invention provides a paraffin remover, and a preparation method and application thereof, which are used for solving the technical defect that blockage of an ultra-deep condensate gas well is difficult to remove in the prior art.
The invention provides a paraffin remover, which comprises the following components in percentage by weight: 0.1-3% of ethylene-vinyl acetate copolymer, 1-2% of dichloroethane, 0.5-0.8% of polyacrylate, 1-2% of styrene, 0.1-0.5% of dispersant, 0.1-0.3% of penetrating agent, 0.1-1% of pour point depressant and the balance of carbon nonaromatic hydrocarbon.
The paraffin remover provided by the invention has simple composition, does not generate layering and precipitation and has stable state. When wax removal is carried out on the oil pipe wax plug of the condensate gas well, the wax remover can quickly permeate into wax, so that the wax in the oil production pipe of the condensate gas well is promoted to be peeled and dispersed, the dissolving speed and the dissolving capacity of the wax are improved, the wax generated in the oil production pipe of the condensate gas well is effectively dissolved, and the oil production pipe of the condensate gas well is opened.
The components of the wax remover are all commonly sold in the market, wherein carbon nine refers to aromatic hydrocarbon fraction with nine carbon atoms, and the main components comprise isopropyl benzene, n-propyl benzene and ethyl toluene.
Further, the composition comprises the following components in percentage by weight: 0.1-3% of ethylene-vinyl acetate copolymer, 1.55% of ethylene-vinyl acetate copolymer, 1.5% of dichloroethane, 0.65% of polyacrylate, 1.5% of styrene, 0.3% of dispersing agent, 0.2% of penetrating agent, 0.55% of pour point depressant and 93.75% of carbon nonaarene.
Further, the pour point depressant is prepared by the following method: dissolving acrylic acid high-carbon alcohol ester in toluene, adding an initiator, and heating and refluxing for 3 hours to obtain the pour point depressant; the mass of the initiator is 0.1 percent of that of the acrylic acid higher alcohol ester;
the initiator is a mixture of benzoyl peroxide, hydrogen peroxide and a rongalite, wherein the mass ratio of the benzoyl peroxide to the hydrogen peroxide to the rongalite is 1: 1: 1.
further, the dispersant is selected from sodium polyacrylate.
The sodium polyacrylate is a water-soluble high molecular compound with hydrophilic and hydrophobic groups, is slowly dissolved in water to form extremely viscous transparent liquid, and the viscosity is not generated by water absorption and swelling (such as CMC (sodium alginate)), but is formed into high-viscosity solution by molecular chain growth and viscosity increase due to the ionic phenomenon of a plurality of anionic groups in the molecule. The viscosity is about 15-20 times of CMC and sodium alginate. The viscosity is little affected by heat treatment, neutral salts and organic acids, and the viscosity is increased when the solution is alkaline.
Sodium polyacrylate goes from colorless dilute solutions to transparent elastic colloids or even solids as the relative molecular mass increases. The properties and the application are obviously different according to different relative molecular masses. The molecular weight is 1000-10000, and the molecular weight can be used as a dispersant and applied to the industrial fields of water treatment (dispersant or antisludging agent), papermaking, textile printing and dyeing, ceramics and the like. When the modified polyvinyl alcohol is used as a paper-making coating dispersant, the relative molecular mass is 2000-4000, and the coating concentration is 65-70%, so that the modified polyvinyl alcohol still has good rheological property and curing stability. The molecular weight is between 1000-3000, and the catalyst is used as a water quality stabilizer and a scaling control agent during black liquor concentration. The molecular weight is more than 10, and the modified styrene-butadiene latex can be used as a coating thickener and a water-retaining agent, so that the viscosity of synthetic latex such as carboxylated styrene-butadiene latex and acrylate emulsion is increased, the water analysis is avoided, and the stability of a coating system is kept. Having a molecular weight of 10 or more, as a flocculant, and as a thickener, emulsifying dispersant, etc. in the food industry.
Further, the penetrating agent is selected from fatty alcohol-polyoxyethylene ether.
Fatty alcohol-polyoxyethylene ether, also known as alcohol ether and alcohol ethoxylate, is used as the fastest-developing and largest-dosage variety in the nonionic surfactant, and has the following advantages:
1. has excellent biodegradability and low-temperature performance;
2. is not influenced by water hardness;
3. the price is low.
Generally, fatty alcohol-polyoxyethylene ether is prepared by ethylene oxide through an oxyethylation reaction in the presence of an alkaline catalyst such as sodium methoxide, sodium ethoxide, sodium hydroxide and the like.
Fatty alcohol polyoxyethylene ether series surfactants have many varieties due to the difference in the number of carbon atoms of fatty alcohols and the number of addition of ethylene oxide. Lower alcohol C7～9The product (trade name is penetrant JFC) added with 5mol to 6mol of EO has good wetting and penetrating properties, and is applied to various processing processes of fibers. When the aliphatic alcohol has a carbon number of C12～14When used, it is usually referred to as AEO; AEO2～3Insoluble in water and commonly used as anion for synthesizing high-efficiency detergents such as AES, AEC and AESSThe surfactant is a raw material, has the performances of emulsification, leveling, permeation and the like, and can be used as a leveling agent, a wetting agent and components of various oil agents in the textile industry; AEO4～9Is an oil-soluble emulsifier, is mainly used as an active component of wool detergent, wool industrial degreasing agent, fabric detergent and liquid detergent, and is used as an emulsifier in general industry; AEO7、AEO9And AEO10The detergent has good wetting, emulsifying and decontaminating performances, can be used as an active substance of a detergent, a detergent and a wetting agent in the textile industry, and the like; AEO15And AEO20Has good emulsifying, dispersing and decontaminating performances, and can be used as leveling agent in textile industry, cleaning agent for metal processing, and emulsifier for cosmetics, pesticide, ink, etc. When the aliphatic alcohol has a carbon number of C14～18And is often referred to as a flat add. Wherein C is14～16Called the plano-additive OS; c16～17Called peregal O, C18Called Pingpingana, etc. The series has good emulsifying and dispersing performances. The secondary alcohol ethoxylate has good biodegradability, low viscosity, large solubility, narrow gelation range, good hard water resistance, good wetting power and detergency; the foam breaking performance is good and the rinsing is easy; has low irritation to skin, and can be easily mixed with other materials. Can be used as detergent, emulsifier, wetting agent, dispersant and plasticizer in the fields of washing products, chemicals, plastics, leather and textile.
The invention also provides a preparation method of any one of the paraffin remover, which comprises the following steps:
mixing the ethylene-vinyl acetate copolymer, dichloroethane, polyacrylate, styrene, a dispersant, a penetrating agent, a pour point depressant and carbon nine, heating to 50-80 ℃, and stirring for 2-5h to obtain the paraffin remover.
Preferably, the heating temperature is 60 ℃ and the stirring time is 2 h.
The preparation method is characterized in that the components are uniformly mixed by adopting a conventional method, and the adding sequence of the reactants is not limited in the invention. For example, ethylene-vinyl acetate copolymer, dichloroethane, polyacrylate, styrene, dispersant, penetrant, pour point depressant, and carbon nine may be added in this order, or carbon nine, pour point depressant, penetrant, dispersant, styrene, polyacrylate, dichloroethane, and ethylene-vinyl acetate copolymer may be added in this order.
Further, the rotating speed of the stirring is 200-300 revolutions per minute.
According to the preparation method provided by the invention, the adding sequence of the ethylene-vinyl acetate copolymer, the dichloroethane, the polyacrylate, the styrene, the dispersant, the penetrating agent, the pour point depressant and the carbon nine can be any, and the adding sequence does not have obvious adverse effect on the effect of the prepared paraffin remover. The preparation method disclosed by the invention is favorable for forming a stable paraffin remover system and enhancing the fluidity of the paraffin remover by adopting proper heating temperature, stirring speed and stirring time, so that the preparation method is more convenient to use and is particularly suitable for removing paraffin for condensate gas wells.
The invention also provides an application of any one of the paraffin remover in paraffin removal of a condensate gas well.
The invention also provides a method for paraffin removal of a condensate gas well, which comprises the step of injecting any paraffin remover into an oil production pipe in the condensate gas well for soaking and paraffin removal.
Specifically, the paraffin remover stored in the chemical tank is pressurized to the outlet pressure which is the safe pressure of the wellhead of the condensate gas well through a swabbing pump, so that the paraffin remover is injected into the oil production pipe. Because the pressure at the bottom of the condensate gas well is very high and reaches more than 10MPa, the injected paraffin cleaner can not enter the bottom of the well, and only stands and soaks in the plugged oil production pipe, after soaking for 5-12 hours, the paraffin in the oil production pipe can be gradually dissolved by the paraffin cleaner, and the pressure at the well head can be found to rise at the moment.
Along with the pressure rise of a wellhead, the paraffin remover in the oil production pipe can be returned to the oil production pipe, the returned paraffin remover can be recovered through a recovery pipeline at the moment, the recovered paraffin remover is injected into the oil production pipe of the condensate gas well again by increasing the injection pressure, and the operation is repeated until the injected paraffin remover is returned rapidly, so that the wax in the oil production pipe can be judged to be basically removed, the blockage is removed, and the blockage removal of the oil production pipe of the condensate gas well is finished.
After the blockage removing work is finished, the paraffin removal capacity of the used paraffin remover can be judged, so that whether the paraffin removal blockage removing work can be continuously used for the paraffin removal blockage removing work of the next condensate gas well oil production pipe is determined.
Specifically, the density of the paraffin remover can be measured, so that the paraffin dissolving amount in the paraffin remover is judged according to the density change of the paraffin remover, when the paraffin dissolving amount in the paraffin remover is less than 15%, the paraffin remover can be continuously used for performing paraffin removal and blockage removal on the next gas condensate well oil production pipe, and when the paraffin dissolving amount in the paraffin remover is more than 15%, most of the paraffin remover is carbon nonaromatic hydrocarbon, so that the paraffin remover can be directly injected into an external crude oil pipeline, and the paraffin remover does not need to perform any post-treatment operation on the paraffin remover.
When the paraffin remover is used for removing paraffin from an oil production pipe of a condensate gas well, the specific dosage of the paraffin remover can be determined according to the specific length of plugging of the oil production pipe, and is not particularly limited.
The implementation of the invention has at least the following advantages:
1. the paraffin remover disclosed by the invention has a high paraffin dissolving speed, can effectively dissolve precipitated paraffin in a condensate gas well, and achieves a good paraffin removing effect;
2. the paraffin remover disclosed by the invention is simple in component, stable in system and convenient to use, can not generate any toxic and harmful substance after paraffin removal, can be recycled without any post-treatment, can be used as a supply to be injected into an oil pipeline after failure, and does not need any recovery treatment operation;
3. the preparation method of the paraffin remover is simple to operate and easy to control, and is not only beneficial to forming a stable paraffin remover system, but also beneficial to enhancing the fluidity of the paraffin remover;
4. the paraffin remover has good paraffin removal effect when used for removing paraffin and unblocking of an oil production pipe of a condensate gas well, simple equipment required by paraffin removal, and no secondary pollution;
5. the paraffin remover does not contain corrosive components, so that damage to oil production pipelines and equipment is avoided;
6. the wax remover disclosed by the invention does not contain a solvent with low lightning, is low in toxicity, and is safe and reliable in use, storage and transportation.
Therefore, the invention provides powerful technical support for removing the precipitated wax in the oil production pipe of the condensate gas well in terms of expected effect and safety.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a view showing the installation of equipment for paraffin removal of a condensate gas well by using the paraffin remover of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
During oil extraction, oil and gas generally flow from a reservoir to the bottom of a well, then rise from the bottom of the well to the top of the well, then flow from the top of the well to an oil gathering station, and after separation and dehydration, the oil and gas flow to an oil and gas transmission main station and are output to a mining area.
Oil recovery can be roughly divided into three phases:
the primary oil recovery usually depends on natural energy such as rock expansion, edge water drive, gravity, natural gas expansion and the like for exploitation, and the natural energy is mainly utilized in the stage to enable oil in an oil reservoir to be lifted to the outside of a well through an oil pipe; however, as the production of crude oil and natural gas continues, the volume of fluid in reservoir rocks and formations gradually expands, elastic energy is gradually released, and the recovery rate of oil at this stage is only 15-20% on average.
The secondary oil recovery mainly improves the pressure of an oil layer through modes of water injection, gas injection and the like, so that the oil well can continue to produce oil after the jet of the oil well is stopped. The water injection exploitation is to inject water into the oil reservoir through a special injection well to maintain or restore the pressure of the oil layer, so that the oil reservoir forms stronger driving force to improve the exploitation rate and the recovery ratio of the oil reservoir; the gas injection exploitation mainly utilizes the effects of viscosity reduction, expansion, miscible phase, molecular diffusion and the like of injected gas to reduce interfacial tension and improve permeability, thereby improving the oil recovery rate of an oil field. Because of the heterogeneity of the formation, the injected fluid generally flows to the well along a path of lesser resistance, while the oil in the relatively more resistant areas, and some of the oil adsorbed by the rock, remains unexplored and the recovery from the secondary recovery phase remains limited.
The tertiary oil recovery mainly changes the viscosity and the adsorbability of crude oil to rocks by adopting various physical and chemical methods, thereby increasing the flowing capacity of the crude oil and further improving the recovery ratio of the crude oil. The tertiary oil recovery method mainly comprises a thermal oil recovery method, a chemical oil displacement method, a miscible phase oil displacement method, a microbial oil displacement method and the like. The thermal oil recovery method mainly utilizes a mode of reducing the viscosity of crude oil to improve the recovery ratio, wherein steam huff and puff is a common thermal oil recovery method, and a certain amount of steam is injected into an oil well and the heat energy of the steam is diffused to an oil layer, so that the viscosity of the crude oil is greatly reduced, and the flowing capacity of the crude oil is improved; the chemical oil displacement method is mainly characterized in that a chemical agent is injected to increase the viscosity of formation water, change the viscosity ratio of crude oil and formation water, reduce the difference between the flowing capacity of water and the flowing capacity of oil in the formation and reduce the adsorbability of the crude oil to rocks so as to improve the oil displacement efficiency; the miscible-phase oil displacement method mainly reduces the viscosity of crude oil and the adsorbability to rocks by injecting natural gas, carbon dioxide and other gases into the crude oil to generate miscible phase; the microbe oil displacement method is to crack heavy hydrocarbon and paraffin wax with microbe and its metabolite to change the macromolecule of petroleum into small molecule and to metabolize to produce gas soluble in crude oil, so as to reduce the viscosity of crude oil and increase the flowability of crude oil, and to raise the recovery rate of crude oil.
However, in the middle and late stages of oil field development, when the local temperature and pressure exceed the critical conditions, the gas generated by the reverse evaporation of the liquid hydrocarbon is called condensate gas. The condensate gas is located in rocks several kilometers deep underground, and the main products obtained by development are condensate oil and natural gas.
In condensate gas wells, due to the reduction of temperature and pressure, heavy components such as paraffin can be separated out from the oil or condensate, so that a tubing string is blocked, and the oil field production can be directly influenced seriously.
At present, no good method is available for paraffin removal of condensate wells, and blockage removal is difficult especially for ultra-deep condensate wells.
In order to overcome the defects in the prior art, the invention aims to provide a paraffin remover, and a preparation method and application thereof, which are used for solving the technical defect that blockage of an ultra-deep condensate gas well is difficult to remove in the prior art.
The present invention will be described in detail below with reference to the accompanying drawings so that those skilled in the art can more fully understand the present invention.
The manufacturers and models of the chemicals used in the following examples are as follows:
ethylene-vinyl acetate copolymer: suzhou Xiuyo plastication Co Ltd
Ethylene dichloride: jinan Changda chemical Co Ltd
Polyacrylate: nanjing Jia Zhong chemical technology Co Ltd
Styrene: jinan Changda chemical Co Ltd
Dispersant (sodium polyacrylate): zusazhou Zhuxin Biotech limited
Penetrant (fatty alcohol-polyoxyethylene ether): "Haian" petrochemical plant of Jiangsu province
Carbon nonaromatic hydrocarbon: lanzhou jade fossil fuel Co Ltd
The pour point depressants in the following examples were prepared as follows:
dissolving acrylic acid higher alcohol ester in toluene, starting heating, adding an initiator in the heating process, refluxing for 3 hours, and performing rotary evaporation treatment on a reaction system to remove the solvent to obtain a pour point depressant; wherein the mass of the initiator is 0.1 percent of that of the acrylic acid high-carbon alcohol ester;
the initiator is a mixture of benzoyl peroxide, hydrogen peroxide and rongalite, wherein the mass ratio of the benzoyl peroxide to the hydrogen peroxide to the rongalite is 1: 1: 1.
in addition, the acrylic acid higher alcohol ester is prepared according to the following method:
adding 100g of higher alcohol into a 500mL three-neck flask, heating to completely melt the higher alcohol, adding 120g of acrylic acid, 0.6 mass percent of polymerization inhibitor (corn starch and soluble starch) and 1 mass percent of polyvinyl alcohol, heating to 110 ℃, and reacting for 6 hours. After the reaction is finished, cooling, adding ethyl acetate, washing with a saturated sodium carbonate solution until the mixture is alkalescent, washing with a saturated sodium chloride solution until the mixture is neutral, separating an organic layer, adding anhydrous calcium chloride, drying, filtering, and evaporating the solvent to obtain the acrylic acid high-carbon alcohol ester.
Example 1
The paraffin remover of the embodiment comprises the following components in percentage by weight:
ethylene-vinyl acetate copolymer: 1.55 percent
Ethylene dichloride: 1.5 percent
Polyacrylate: 0.65 percent
Styrene: 1.5 percent
Dispersing agent: 0.3 percent of
Penetrant: 0.2 percent of
Pour point depressant: 0.55 percent
Carbon nonaromatic hydrocarbon: 93.75 percent.
The paraffin remover can be prepared by the following method:
after the components are mixed according to the composition, the ethylene-vinyl acetate copolymer, the dichloroethane, the polyacrylate, the styrene, the dispersant, the penetrating agent, the pour point depressant and the carbon nine are mixed in a reaction kettle, heated to 60 ℃, stirred for 2 hours at the stirring speed of 250r/min, and cooled to room temperature to prepare the paraffin remover of the embodiment.
Example 2
The paraffin remover of the embodiment comprises the following components in percentage by weight:
ethylene-vinyl acetate copolymer: 1.5 percent
Ethylene dichloride: 1.5 percent
Polyacrylate: 0.6 percent
Styrene: 1 percent of
Dispersing agent: 0.2 percent of
Penetrant: 0.2%:
pour point depressant: 0.15 percent
Carbon nonaromatic hydrocarbon: 94.85 percent
The paraffin remover can be prepared by the following method:
after the components are mixed according to the composition, the ethylene-vinyl acetate copolymer, the dichloroethane, the polyacrylate, the styrene, the dispersant, the penetrating agent, the pour point depressant and the carbon nine are mixed in a reaction kettle, heated to 50 ℃, stirred for 3 hours at a stirring speed of 270r/min, and cooled to room temperature to prepare the paraffin remover of the embodiment.
Example 3
The paraffin remover of the embodiment comprises the following components in percentage by weight:
ethylene-vinyl acetate copolymer: 2 percent of
Ethylene dichloride: 1.6 percent
Polyacrylate: 0.7 percent
Styrene: 1.5 percent
Dispersing agent: 0.3 percent of
Penetrant: 0.25 percent
Pour point depressant: 0.17 percent
Carbon nonaromatic hydrocarbon: 93.47 percent
The paraffin remover can be prepared by the following method:
after the components are mixed according to the composition, the ethylene-vinyl acetate copolymer, the dichloroethane, the polyacrylate, the styrene, the dispersant, the penetrating agent, the pour point depressant and the carbon nine are mixed in a reaction kettle, heated to 74 ℃, stirred for 4 hours at the stirring speed of 230r/min, and cooled to room temperature to prepare the paraffin remover of the embodiment.
Example 4
The paraffin remover of the embodiment comprises the following components in percentage by weight:
ethylene-vinyl acetate copolymer: 2.5 percent of the total weight of the mixture,
ethylene dichloride: 1.7 percent of the total weight of the steel,
polyacrylate: 0.75 percent of the total weight of the mixture,
styrene: 1.7 percent of the total weight of the steel,
dispersing agent: 0.4 percent of the total weight of the mixture,
penetrant: 0.27 percent of the total weight of the steel,
pour point depressant: 0.18 percent
Carbon nonaromatic hydrocarbon: 92.5 percent
The paraffin remover can be prepared by the following method:
after the components are mixed according to the composition, the ethylene-vinyl acetate copolymer, the dichloroethane, the polyacrylate, the styrene, the dispersant, the penetrating agent, the pour point depressant and the carbon nine are mixed in a reaction kettle, heated to 65 ℃, stirred for 5 hours at the stirring speed of 250r/min, and cooled to room temperature to prepare the paraffin remover of the embodiment.
Example 5
The paraffin remover of the embodiment comprises the following components in percentage by weight:
ethylene-vinyl acetate copolymer: 2.7 percent
Ethylene dichloride: 1.8 percent
Polyacrylate: 0.78 percent
Styrene: 1.8 percent
Dispersing agent: 0.45 percent
Penetrant: 0.28 percent
Pour point depressant: 0.19 percent
Carbon nonaromatic hydrocarbon: 92 percent of
The paraffin remover can be prepared by the following method:
after the components are mixed according to the composition, the ethylene-vinyl acetate copolymer, the dichloroethane, the polyacrylate, the styrene, the dispersant, the penetrating agent, the pour point depressant and the carbon nine are mixed in a reaction kettle, heated to 60 ℃, stirred for 2 hours at the stirring speed of 280r/min, and cooled to room temperature to prepare the paraffin remover of the embodiment.
Example 6
The paraffin remover of the embodiment comprises the following components in percentage by weight:
ethylene-vinyl acetate copolymer: 3 percent of
Ethylene dichloride: 2 percent of
Polyacrylate: 0.8 percent
Styrene: 2 percent of
Dispersing agent: 0.5 percent
Penetrant: 0.3 percent of
Pour point depressant: 1 percent of
Carbon nonaromatic hydrocarbon: 90.4 percent
The paraffin remover can be prepared by the following method:
after the components are mixed according to the composition, the ethylene-vinyl acetate copolymer, the dichloroethane, the polyacrylate, the styrene, the dispersant, the penetrating agent, the pour point depressant and the carbon nine are mixed in a reaction kettle, heated to 80 ℃, stirred for 1.5 hours at the stirring speed of 300r/min, and cooled to room temperature to prepare the paraffin remover of the embodiment.
Test example 1
The paraffin removal agent prepared in the above examples 1-2 and the paraffin removal agent of the above comparative example were used to respectively perform paraffin removal tests on ultra-deep condensate wells of a certain gas field of Tarim oil field company.
FIG. 1 is an equipment installation diagram when the paraffin remover is used for removing paraffin from a condensate gas well, and before a paraffin removal test, corresponding paraffin removal equipment is installed according to the diagram in FIG. 1, and the paraffin remover is put into a medicine chest for standby.
After the installation is finished, firstly, a control valve A of a medicine box is opened, the pressure of a swabbing pump is adjusted to extract the paraffin removal agent, then, a valve 1, a valve 2 and a valve 3 are opened, the pressure of the pressure gauge 1 and the pressure gauge 2 is monitored, the injection pressure of the paraffin removal agent is enabled to be not higher than the safe pressure of a well mouth, the paraffin removal agent is injected into a petroleum production pipe through a medicine inlet pipe arranged in the petroleum production pipe of a condensate gas well to be subjected to paraffin removal treatment, and after the paraffin removal agent is injected, well mouth pressure parameters and back-discharged paraffin removal agent density parameters are monitored, and the table 1 shows.
When the pressure of the well head is about to reach the safety pressure, the paraffin removal agent in the oil production pipe needs to be discharged back, namely, whether the paraffin removal work of the paraffin removal agent in the current well is finished or not is judged according to the pressure of the well head. Generally, the paraffin removal operation can be completed by injecting a paraffin removal agent into the condensate gas well for multiple times, and the parameters in table 1 are parameters of one paraffin removal operation.
Before the paraffin removal work is carried out, the density of the condensate oil with different wax contents at present can be measured by adding wax with different mass into the condensate oil, a standard curve can be made according to a plurality of groups of density-wax mass parameters, so that the density of the flowback condensate oil can be combined with the standard curve during the paraffin removal work to obtain the mass of the dissolved wax in the condensate oil, and the mass is the mass of the wax dissolved in the paraffin remover in the oil pipe.
After the paraffin removal treatment is finished, the valve 2 and the valve 3 are closed, the control valve B of the recovery device is opened, the paraffin removal agent in the condensate gas well is enabled to be returned to the recovery device, whether the paraffin removal agent can be continuously used as the paraffin removal agent of the condensate gas well for continuous use or not can be judged by detecting the density of the paraffin removal agent returned to the recovery device, and if the paraffin removal agent cannot be continuously used, the paraffin removal agent can be directly discharged to an oil pipeline without any treatment.
Moreover, long-term paraffin removal tests show that when the paraffin removal agent prepared in the embodiment 1-2 of the invention is used for paraffin removal treatment, the corrosion degree to the oil production pipeline (steel) and subsequent equipment (steel) is small, and the service life of the oil production pipeline and the subsequent equipment is obviously prolonged compared with the conventional paraffin removal agent.
Test example 2
The paraffin removal agent prepared in the above examples 3 to 4 was used to respectively perform paraffin removal tests on ultra-deep condensate wells of a certain gas field of Tarim oil field company.
FIG. 1 is an equipment installation diagram when the paraffin remover is used for removing paraffin from a condensate gas well, and before a paraffin removal test, corresponding paraffin removal equipment is installed according to the diagram in FIG. 1, and the paraffin remover is put into a medicine chest for standby.
After the installation is finished, firstly, a control valve A of a medicine box is opened, the pressure of a swabbing pump is adjusted to extract the paraffin removal agent, then, a valve 1, a valve 2 and a valve 3 are opened, the pressure of the pressure gauge 1 and the pressure gauge 2 is monitored, the injection pressure of the paraffin removal agent is enabled to be not higher than the safe pressure of a well mouth, the paraffin removal agent is injected into an adoption pipe through a medicine inlet pipe arranged in an oil production pipe of a condensate gas well to be subjected to paraffin removal treatment, and after the paraffin removal agent is injected, a well mouth pressure parameter and a back-discharged paraffin removal agent density parameter are monitored, and the table 1 shows.
When the pressure of the well head is about to reach the safety pressure, the paraffin removal agent in the oil production pipe needs to be discharged back, namely, whether the paraffin removal work of the paraffin removal agent in the current well is finished or not is judged according to the pressure of the well head. Generally, the paraffin removal operation can be completed by injecting a paraffin removal agent into the condensate gas well for multiple times, and the parameters in table 1 are parameters of one paraffin removal operation.
Before the paraffin removal work is carried out, the density of the condensate oil with different wax contents at present can be measured by adding wax with different mass into the condensate oil, a standard curve can be made according to a plurality of groups of density-wax mass parameters, so that the density of the flowback condensate oil can be combined with the standard curve during the paraffin removal work to obtain the mass of the dissolved wax in the condensate oil, and the mass is the mass of the wax dissolved in the paraffin remover in the oil pipe.
After the paraffin removal treatment is finished, the valve 2 and the valve 3 are closed, the control valve B of the recovery device is opened, the paraffin removal agent in the condensate gas well is enabled to be returned to the recovery device, whether the paraffin removal agent can be continuously used as the paraffin removal agent of the condensate gas well for continuous use or not can be judged by detecting the density of the paraffin removal agent returned to the recovery device, and if the paraffin removal agent cannot be continuously used, the paraffin removal agent can be directly discharged to an oil pipeline without any treatment.
Moreover, long-term paraffin removal tests show that when the paraffin removal agent prepared in the embodiment 3-4 of the invention is used for paraffin removal treatment, the corrosion degree to an oil production pipeline (made of steel) and subsequent equipment (made of steel) is small, and the service life of the oil production pipeline and the subsequent equipment is obviously prolonged.
Test example 3
The paraffin removal agent prepared in the above examples 5 to 6 was used to respectively perform paraffin removal tests on ultra-deep condensate wells of a certain gas field of Tarim oil field company.
FIG. 1 is an equipment installation diagram when the paraffin remover is used for removing paraffin from a condensate gas well, and before a paraffin removal test, corresponding paraffin removal equipment is installed according to the diagram in FIG. 1, and the paraffin remover is put into a medicine chest for standby.
After the installation is finished, firstly, a control valve A of a medicine box is opened, the pressure of a swabbing pump is adjusted to extract the paraffin removal agent, then, a valve 1, a valve 2 and a valve 3 are opened, the pressure of the pressure gauge 1 and the pressure gauge 2 is monitored, the injection pressure of the paraffin removal agent is enabled to be not higher than the safe pressure of a well mouth, the paraffin removal agent is injected into an adoption pipe through a medicine inlet pipe arranged in an oil production pipe of a condensate gas well to be subjected to paraffin removal treatment, and after the paraffin removal agent is injected, a well mouth pressure parameter and a back-discharged paraffin removal agent density parameter are monitored, and the table 1 shows.
When the pressure of the well head is about to reach the safety pressure, the paraffin removal agent in the oil production pipe needs to be discharged back, namely, whether the paraffin removal work of the paraffin removal agent in the current well is finished or not is judged according to the pressure of the well head. Generally, the paraffin removal operation can be completed by injecting a paraffin removal agent into the condensate gas well for multiple times, and the parameters in table 1 are parameters of one paraffin removal operation.
Before the paraffin removal work is carried out, the density of the condensate oil with different wax contents at present can be measured by adding wax with different mass into the condensate oil, a standard curve can be made according to a plurality of groups of density-wax mass parameters, so that the density of the flowback condensate oil can be combined with the standard curve during the paraffin removal work to obtain the mass of the dissolved wax in the condensate oil, and the mass is the mass of the wax dissolved in the paraffin remover in the oil pipe.
After the paraffin removal treatment is finished, the valve 2 and the valve 3 are closed, the control valve B of the recovery device is opened, the paraffin removal agent in the condensate gas well is enabled to be returned to the recovery device, whether the paraffin removal agent can be continuously used as the paraffin removal agent of the condensate gas well for continuous use or not can be judged by detecting the density of the paraffin removal agent returned to the recovery device, and if the paraffin removal agent cannot be continuously used, the paraffin removal agent can be directly discharged to an oil pipeline without any treatment.
Moreover, long-term paraffin removal tests show that when the paraffin removal agent prepared in the embodiment 5-6 of the invention is used for paraffin removal treatment, the corrosion degree to an oil production pipeline (made of steel) and subsequent equipment (made of steel) is small, and the service life of the oil production pipeline and the subsequent equipment is obviously prolonged.
In the above test examples 1 to 3, the condensate before paraffin removal without using a paraffin remover had a density of 948.8kg/m3。
TABLE 1 relevant test parameters for wax removers in examples 1-6
From the results in Table 1, it can be seen that: the paraffin removal agent prepared by the invention has excellent paraffin removal effect, can effectively reduce the density of condensate oil, namely, can dissolve the wax in the condensate oil, so that the paraffin removal agent can obtain good paraffin removal effect on wax precipitation under extremely low temperature and pressure conditions of condensate gas wells and the like.
Test example 4
The wax-dissolving rates of the wax cleaners prepared in examples 1-6 above and the comparative example were tested.
The wax dissolution rate was measured as follows:
and melting standard paraffin or the collected deposited wax sample, pouring the melted standard paraffin or the collected deposited wax sample into a wax ball mould, combining the wax ball mould into an integral gold deposit, and after the wax is completely cooled, slightly rotating the wax ball mould, removing wax balls, wherein the weighed mass is m, and the accurate mass is 0.001 g.
Measuring a certain volume of paraffin remover in a measuring cylinder with a plug, placing the measuring cylinder in a constant-temperature water bath kettle for preheating for 15min, controlling the temperature of the constant-temperature water bath at 44-46 ℃ to enable the temperature of the paraffin remover to be consistent with the temperature of the water bath, and immersing a paraffin ball with the mass of m in the paraffin remover, wherein the time for complete dissolution is t.
The formula for calculating the wax dissolution rate is as follows:
wherein the content of the first and second substances,
v is the dissolution rate in g/min;
m is the mass of the wax ball and is g;
t is the time taken for the wax ball to dissolve out in min.
The paraffin wax-dissolving rates of the paraffin wax removers of examples 1 to 6 were respectively tested:
1. 15ml of the paraffin remover in the embodiment 1 is measured in a measuring cylinder with a plug, and is placed in a constant temperature water bath kettle to be preheated for 15min, and the temperature of the constant temperature water bath is controlled at 44-46 ℃ so that the temperature of the paraffin remover is consistent with the temperature of the water bath. And (3) immersing a standard paraffin wax ball with the mass of 1g into the paraffin wax remover, wherein the complete dissolution time is 10min, and the dissolution rate reaches 0.1 g/min.
2. 15ml of the paraffin remover in the embodiment 2 is measured in a measuring cylinder with a plug, and is placed in a constant temperature water bath kettle to be preheated for 15min, and the temperature of the constant temperature water bath is controlled at 44-46 ℃ so that the temperature of the paraffin remover is consistent with the temperature of the water bath. And (3) immersing a standard paraffin wax ball with the mass of 1g into the paraffin wax remover, wherein the complete dissolution time is 15min, and the dissolution rate reaches 0.67 g/min.
3. 15ml of the paraffin remover in the embodiment 3 is measured in a measuring cylinder with a plug, and is placed in a constant temperature water bath kettle to be preheated for 15min, and the temperature of the constant temperature water bath is controlled at 44-46 ℃ so that the temperature of the paraffin remover is consistent with the temperature of the water bath. And (3) immersing a standard paraffin wax ball with the mass of 1g into the paraffin wax remover, wherein the complete dissolution time is 20min, and the dissolution rate reaches 0.05 g/min.
4. 15ml of the paraffin remover in the embodiment 4 is measured in a measuring cylinder with a plug, and is placed in a constant temperature water bath kettle to be preheated for 15min, and the temperature of the constant temperature water bath is controlled at 44-46 ℃ so that the temperature of the paraffin remover is consistent with the temperature of the water bath. And (3) immersing a standard paraffin wax ball with the mass of 1g into the paraffin wax remover, wherein the complete dissolution time is 25min, and the dissolution rate reaches 0.04 g/min.
5. 15ml of the paraffin remover in the embodiment 5 is measured in a measuring cylinder with a plug, and is placed in a constant temperature water bath kettle to be preheated for 15min, and the temperature of the constant temperature water bath is controlled at 44-46 ℃ so that the temperature of the paraffin remover is consistent with the temperature of the water bath. And (3) immersing a standard paraffin wax ball with the mass of 1g into the paraffin wax remover, wherein the complete dissolution time is 30min, and the dissolution rate reaches 0.33 g/min.
6. 15ml of the paraffin remover in the embodiment 6 is measured in a measuring cylinder with a plug, and is placed in a constant temperature water bath kettle to be preheated for 15min, and the temperature of the constant temperature water bath is controlled at 44-46 ℃ so that the temperature of the paraffin remover is consistent with the temperature of the water bath. And (3) immersing a standard paraffin wax ball with the mass of 1g into the paraffin wax remover, wherein the complete dissolution time is 35min, and the dissolution rate reaches 0.29 g/min.
From the above test example 4, it is clear that: the wax remover prepared by the invention has excellent wax removing effect, so that the wax remover can obtain good wax removing effect on wax precipitation in a common gasoline well.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (7)
1. The paraffin remover is characterized by comprising the following components in percentage by weight: 0.1-3% of ethylene-vinyl acetate copolymer, 1-2% of dichloroethane, 0.5-0.8% of polyacrylate, 1-2% of styrene, 0.1-0.5% of dispersant, 0.1-0.3% of penetrating agent, 0.1-1% of pour point depressant and the balance of carbon nonaromatic hydrocarbon; the carbon nonaarene comprises isopropyl benzene, n-propyl benzene and ethyl toluene;
the dispersant is selected from sodium polyacrylate; the penetrating agent is selected from fatty alcohol-polyoxyethylene ether;
the pour point depressant is prepared by the following method: dissolving acrylic acid high-carbon alcohol ester in toluene, adding an initiator, and heating and refluxing for 3 hours to obtain the pour point depressant; the mass of the initiator is 0.1 percent of that of the acrylic acid higher alcohol ester;
the initiator is a mixture of benzoyl peroxide, hydrogen peroxide and a rongalite, wherein the mass ratio of the benzoyl peroxide to the hydrogen peroxide to the rongalite is 1: 1: 1.
2. the paraffin remover according to claim 1, which comprises the following components in percentage by weight: 1.55% of ethylene-vinyl acetate copolymer, 1.5% of dichloroethane, 0.65% of polyacrylate, 1.5% of styrene, 0.3% of dispersant, 0.2% of penetrant, 0.55% of pour point depressant and 93.75% of carbon nonaarene.
3. A process for preparing a paraffin remover as claimed in any one of claims 1 to 2, comprising the steps of:
mixing the ethylene-vinyl acetate copolymer, dichloroethane, polyacrylate, styrene, a dispersant, a penetrating agent, a pour point depressant and carbon nine, heating to 50-80 ℃, and stirring for 2-5h to obtain the paraffin remover.
4. The method for preparing the paraffin remover according to claim 3, wherein the stirring speed is 200-300 r/min.
5. Use of the paraffin remover according to any one of claims 1 to 2 for removing paraffin from condensate wells.
6. A method for cleaning a condensate gas well, which is characterized in that the paraffin remover as claimed in any one of claims 1 to 2 is injected into a production pipe in the condensate gas well and soaked for paraffin removal.
7. The method of claim 6, wherein the soaking time is 5-12 hours.
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| CN110577828A (en) * | 2019-09-06 | 2019-12-17 | 西安长庆化工集团有限公司 | Nano-particle wax-proof pour point depressant for oil well as preparation method and application thereof |
| CN110907605B (en) * | 2019-12-10 | 2022-09-16 | 东营市百扬石油科技有限责任公司 | Simulation efficiency testing device for medicament used in oil well casing |
| CN115746811B (en) * | 2022-11-17 | 2024-03-29 | 中国石油天然气集团有限公司 | Wax-proof pour point depressant for shale oil reservoir and preparation method thereof |
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