CN111826145B - Petroleum wax precipitation regulating and controlling agent and using method and application thereof - Google Patents
Petroleum wax precipitation regulating and controlling agent and using method and application thereof Download PDFInfo
- Publication number
- CN111826145B CN111826145B CN202010729221.8A CN202010729221A CN111826145B CN 111826145 B CN111826145 B CN 111826145B CN 202010729221 A CN202010729221 A CN 202010729221A CN 111826145 B CN111826145 B CN 111826145B
- Authority
- CN
- China
- Prior art keywords
- wax
- oil
- crude oil
- regulating agent
- regulating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 68
- 230000001105 regulatory effect Effects 0.000 title claims abstract description 60
- 238000001556 precipitation Methods 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000012169 petroleum derived wax Substances 0.000 title claims abstract description 15
- 235000019381 petroleum wax Nutrition 0.000 title claims abstract description 15
- 230000001276 controlling effect Effects 0.000 title abstract description 8
- 239000001993 wax Substances 0.000 claims abstract description 120
- 239000010779 crude oil Substances 0.000 claims abstract description 72
- 239000003921 oil Substances 0.000 claims abstract description 30
- 125000005575 polycyclic aromatic hydrocarbon group Chemical group 0.000 claims abstract description 14
- 229920000642 polymer Polymers 0.000 claims abstract description 14
- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical compound CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000003381 stabilizer Substances 0.000 claims abstract description 11
- 239000003208 petroleum Substances 0.000 claims abstract description 9
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000000203 mixture Substances 0.000 claims abstract description 8
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000003350 kerosene Substances 0.000 claims abstract description 5
- -1 naphtha Chemical compound 0.000 claims abstract description 5
- XDTMQSROBMDMFD-UHFFFAOYSA-N Cyclohexane Chemical compound C1CCCCC1 XDTMQSROBMDMFD-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000002283 diesel fuel Substances 0.000 claims abstract description 4
- 239000003129 oil well Substances 0.000 claims description 21
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 12
- 229920001577 copolymer Polymers 0.000 claims description 10
- MWPLVEDNUUSJAV-UHFFFAOYSA-N anthracene Chemical compound C1=CC=CC2=CC3=CC=CC=C3C=C21 MWPLVEDNUUSJAV-UHFFFAOYSA-N 0.000 claims description 8
- 238000004458 analytical method Methods 0.000 claims description 6
- 239000004215 Carbon black (E152) Substances 0.000 claims description 4
- XBDYBAVJXHJMNQ-UHFFFAOYSA-N Tetrahydroanthracene Natural products C1=CC=C2C=C(CCCC3)C3=CC2=C1 XBDYBAVJXHJMNQ-UHFFFAOYSA-N 0.000 claims description 4
- 229930195733 hydrocarbon Natural products 0.000 claims description 4
- 150000002430 hydrocarbons Chemical class 0.000 claims description 4
- IFLREYGFSNHWGE-UHFFFAOYSA-N tetracene Chemical compound C1=CC=CC2=CC3=CC4=CC=CC=C4C=C3C=C21 IFLREYGFSNHWGE-UHFFFAOYSA-N 0.000 claims description 4
- 125000004185 ester group Chemical group 0.000 claims description 3
- STVZJERGLQHEKB-UHFFFAOYSA-N ethylene glycol dimethacrylate Chemical compound CC(=C)C(=O)OCCOC(=O)C(C)=C STVZJERGLQHEKB-UHFFFAOYSA-N 0.000 claims description 2
- 239000003607 modifier Substances 0.000 claims 3
- 150000001924 cycloalkanes Chemical class 0.000 claims 1
- 238000011084 recovery Methods 0.000 claims 1
- 239000013078 crystal Substances 0.000 abstract description 35
- 239000000126 substance Substances 0.000 abstract description 20
- 230000000694 effects Effects 0.000 abstract description 17
- 230000002265 prevention Effects 0.000 abstract description 14
- 230000005496 eutectics Effects 0.000 abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 9
- 230000008569 process Effects 0.000 abstract description 8
- 239000007788 liquid Substances 0.000 abstract description 6
- 239000004927 clay Substances 0.000 abstract description 4
- 231100000956 nontoxicity Toxicity 0.000 abstract description 4
- 230000018044 dehydration Effects 0.000 abstract description 3
- 238000006297 dehydration reaction Methods 0.000 abstract description 3
- 230000007246 mechanism Effects 0.000 abstract description 3
- 239000012188 paraffin wax Substances 0.000 description 56
- 238000005516 engineering process Methods 0.000 description 14
- 238000012360 testing method Methods 0.000 description 12
- 230000008021 deposition Effects 0.000 description 9
- 230000000881 depressing effect Effects 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000009826 distribution Methods 0.000 description 5
- 230000008014 freezing Effects 0.000 description 5
- 238000007710 freezing Methods 0.000 description 5
- 230000002829 reductive effect Effects 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 238000000605 extraction Methods 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 239000003814 drug Substances 0.000 description 3
- 125000000524 functional group Chemical group 0.000 description 3
- 238000004817 gas chromatography Methods 0.000 description 3
- 230000000813 microbial effect Effects 0.000 description 3
- 239000004094 surface-active agent Substances 0.000 description 3
- UFWIBTONFRDIAS-UHFFFAOYSA-N Naphthalene Chemical compound C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 description 2
- 150000001335 aliphatic alkanes Chemical class 0.000 description 2
- 238000004587 chromatography analysis Methods 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 230000002354 daily effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 239000003995 emulsifying agent Substances 0.000 description 2
- 239000000839 emulsion Substances 0.000 description 2
- 239000005038 ethylene vinyl acetate Substances 0.000 description 2
- 230000003203 everyday effect Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 239000004200 microcrystalline wax Substances 0.000 description 2
- 235000019808 microcrystalline wax Nutrition 0.000 description 2
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 2
- 229920000058 polyacrylate Polymers 0.000 description 2
- 229920002689 polyvinyl acetate Polymers 0.000 description 2
- 239000011118 polyvinyl acetate Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 1
- 230000001580 bacterial effect Effects 0.000 description 1
- DQXBYHZEEUGOBF-UHFFFAOYSA-N but-3-enoic acid;ethene Chemical compound C=C.OC(=O)CC=C DQXBYHZEEUGOBF-UHFFFAOYSA-N 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000007764 o/w emulsion Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000000700 radioactive tracer Substances 0.000 description 1
- 230000008844 regulatory mechanism Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- 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
- C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
- C09K8/524—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning organic depositions, e.g. paraffins or asphaltenes
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
- E21B37/06—Methods or apparatus for cleaning boreholes or wells using chemical means for preventing or limiting, e.g. eliminating, the deposition of paraffins or like substances
-
- 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
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/12—Swell inhibition, i.e. using additives to drilling or well treatment fluids for inhibiting clay or shale swelling or disintegrating
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Environmental & Geological Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Geochemistry & Mineralogy (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
Abstract
The invention relates to the technical field of petroleum exploitation and wax-containing crude oil gathering and transportation, in particular to a petroleum wax precipitation regulating and controlling agent and a using method and application thereof, wherein the petroleum wax precipitation regulating and controlling agent comprises the following components in parts by weight: 20-60 parts of polycyclic aromatic hydrocarbon, 20-60 parts of comb polymer and 10-80 parts of stabilizer; the stabilizer is one or a mixture of more of petroleum ether, diesel oil, kerosene, naphtha, n-heptane, n-hexane or cyclohexane in any proportion. The petroleum wax precipitation regulating agent has the functions of wax prevention and pour point depression, and the regulating mechanism of the regulating agent is that substances which form eutectic with wax crystals and enable the wax crystals to be uniformly dispersed are put into crude oil, so the wax prevention and pour point depression effects of the regulating agent are not influenced by the water content of the crude oil, and the dehydration of a united station cannot be influenced when the regulating agent is used in a large area. In addition, the regulating agent is oil-based liquid, does not cause clay expansion, has the advantages of no toxicity, high flash point and the like, and improves the safety factor in the use process.
Description
Technical Field
The invention relates to the technical field of petroleum exploitation and wax-containing crude oil gathering and transportation, in particular to a petroleum wax precipitation regulating and controlling agent and a using method and application thereof.
Background
Most of crude oil extracted in China contains a certain amount of wax, the wax is completely dissolved in the crude oil before oil well development, and in the oil well extraction process, the crude oil flows into a well bottom from an oil layer and is lifted to a well head from the well bottom along a shaft, the temperature and the pressure of the crude oil are continuously reduced, so that the paraffin is crystallized, precipitated, aggregated and condensed and is adhered to the metal surface of an oil well facility, namely the wax of the oil well. In oil production, wax deposition can block an oil production layer, reduce the yield of an oil well, increase the load of the oil well and cause production accidents, and under extreme conditions, the wax deposition can completely block an oil well pipeline when the wax deposition is serious, so that the production is stopped.
In order to ensure the yield and the production efficiency of an oil well, the conventional paraffin prevention method for the oil well comprises the steps of preventing wax crystals from separating out, inhibiting the accumulation of paraffin crystals and creating conditions unfavorable for paraffin deposition. The specific technologies can be classified into mechanical paraffin removal technology, thermal paraffin removal technology, microbial paraffin removal technology, chemical paraffin removal technology and the like. However, each technology has certain limitations, for example, the mechanical paraffin removal technology can not remove the paraffin on the joint and the limiter of the sucker rod, and other paraffin removal measures, such as heat carrier circulation well washing or chemical paraffin removal, need to be supplemented periodically; the thermal wax removal technology is most effective, but the operation cost is high, and the use condition is limited; the microbial paraffin removal technology developed in recent years has good effect, but the cost is high, and when the microbial paraffin removal technology is applied to deep wells, the application range is limited due to the temperature resistance of the microbes, and an oil well needs to be cleaned before the microbes are added, so that the operation difficulty is high.
With the development of the technology, methods such as sound wave wax removal and prevention and bacterial wax removal and prevention appear, but the two methods have high requirements on equipment or environment, have strong operation technology and are not beneficial to field application.
The chemical agent paraffin removal and prevention technology can overcome the defects of the method, has good paraffin removal effect and has good market application prospect. The paraffin removing and preventing agent used for chemical paraffin removal mainly comprises an oil-based paraffin removing agent, a water-based paraffin removing agent, an emulsion type paraffin removing agent and a solid paraffin removing agent. The oil-based paraffin remover mainly comprises an organic solvent, a surfactant and a small amount of polymer, has strong adaptability to crude oil, high paraffin dissolving speed and low product solidifying point, is convenient to use in winter, but also has the defects of small relative density, unsuitability for high-water-content oil wells, low burning point, easiness in ignition and necessity of reinforcing fireproof measures during use; the water-based paraffin remover consists of water and a surfactant, has high relative density, good application effect on high-water-content oil wells, safe use and no ignition risk, and has the defect of slow effect, and the liquidity of the water-based paraffin remover is still required to be improved when used in winter; the emulsion type paraffin remover is an oil-in-water emulsion formed by adding the oil-based paraffin remover into water, an emulsifier and a stabilizer, has high paraffin dissolving speed, has strict requirements on selection of the emulsifier and demulsification temperature at the bottom of a well, has higher requirements on preparation and use time and is limited in field use; the solid paraffin remover mainly comprises high-molecular polyethylene, a stabilizer and EVA (ethylene-vinyl acetate polymer), has short paraffin prevention period in one operation, high cost, difficult control of the underground dissolving speed, no universality and strong pertinence to oil products.
Therefore, it is an urgent technical problem in the art to develop a novel petroleum wax precipitation controlling agent to solve the above problems.
Disclosure of Invention
The first purpose of the invention is to provide a petroleum wax precipitation regulating agent which has the functions of wax prevention and pour point depression;
the second purpose of the invention is to provide a using method of the petroleum wax precipitation regulating agent, which can effectively reduce the deposition of wax on the pipe wall.
The invention provides a petroleum wax precipitation regulating agent which comprises the following components in parts by weight: 20-60 parts of polycyclic aromatic hydrocarbon, 20-60 parts of comb polymer and 10-80 parts of stabilizer;
the stabilizer is one or a mixture of more of petroleum ether, diesel oil, kerosene, naphtha, n-heptane, n-hexane or cyclohexane in any proportion.
The invention is based on the chemical structure (C) of wax in petroleum16H34～C63H12) The condensed-ring aromatic hydrocarbon with the poly-wax-based functional group can provide a plurality of pseudo wax nuclei as crystal nucleus attachment points for wax precipitation in the crude oil in advance before the wax in the crude oil is precipitated, so that the poly-wax-based functional group and wax crystals precipitated in the crude oil are eutectic, and the wax crystals after eutectic are difficult to be continuously attached to a solid boundary, so that the wax crystals are suspended in light components of the crude oil and have the wax-proofing function; according to the characteristics of eutectic paraffin or microcrystalline wax groups suspended in the light components of the crude oil, the comb-shaped polymer containing the wax thinning group is selected to control the maximum diameter of the eutectic to be smaller than 0.035mm, and the eutectic is inhibited from being mutually bonded to form a net-shaped large-size wax block (or wax ball) and is suspended in the light components of the crude oil better, so that the flow guarantee problem caused by paraffin precipitation of the petroleum is avoided; however, in order to make the polycyclic aromatic hydrocarbon and the comb-like polymer fully dissolved in the waxy crude oil and thereby better exert the function regulation and control function, the invention also selects a solvent consisting of any one or more of petroleum ether, diesel oil, kerosene, naphtha, n-heptane, n-hexane or cyclohexane as the function stabilizer. In conclusion, the petroleum wax precipitation regulating agent has the functions of wax prevention and wax controlThe pour point depressing action is realized by adding a substance which can form eutectic with wax crystals and uniformly disperse the wax crystals into the crude oil according to the regulation mechanism, so that the wax control and pour point depressing action is not influenced by the water content in the crude oil. In addition, the petroleum wax precipitation regulating agent is oil-based liquid, cannot cause clay expansion, has the advantages of no toxicity, high flash point and the like, and greatly improves the safety factor in the use process.
Further, the polycyclic aromatic hydrocarbon is a composition compounded by any one or more of naphthene, anthracene or tetracene in any proportion.
The polycyclic aromatic hydrocarbon can be any one or more of naphthene, anthracene or tetracene, and the solubility of the substances in crude oil is lower than that of paraffin, so that the substances are precipitated before the paraffin along with the reduction of temperature and pressure in the crude oil extraction process, a large number of crystal nuclei are provided for the precipitation of the paraffin, and the paraffin is precipitated on the crystal nucleus surfaces of the substances. The special chemical structure of the polycyclic aromatic hydrocarbon molecules influences the regular arrangement of wax crystals, so that the crystal nuclei of the wax crystals are distorted and deformed, and further the wax crystals are inhibited from further growing up.
Further, the comb-shaped polymer is a composition which is prepared by mixing any one or more of polyacrylate, polyvinyl acetate, ethylene-acrylic acetate copolymer or ethylene-methacrylate copolymer in any proportion.
Based on the characteristics of eutectic paraffin or microcrystalline wax groups suspended in light components of crude oil, the oil-soluble comb polymer selected by the invention is any one or more of polyacrylate, polyvinyl acetate, ethylene-acrylic acetate copolymer or ethylene-methacrylate copolymer, the main chain of the substance is mainly alkane, and the side chain of the substance is ester group-containing alkane, and the substance has a structure and a polar group similar to paraffin molecules.
The invention also discloses a use method of the wax precipitation regulating agent, which comprises the following steps:
s1, analyzing the wax components of the crude oil, and determining the formula of the regulating agent according to the analysis result;
s2, determining the dosage and the adding mode of the regulating agent according to the determined formula of the regulating agent and the influence of the regulating agent on the quality of the oil product before and after the regulating agent is added.
In order to obtain the best use formula and use proportion of the paraffin precipitation regulator, and improve the utilization rate of the paraffin precipitation regulator on the premise of ensuring the excellent pour point depression effect of the paraffin precipitation regulator, the invention also discloses a use method of the paraffin precipitation regulator, namely, firstly, the paraffin in crude oil can be dispersed into a plurality of small crystals (the diameter is 0.035mm) by the petroleum paraffin precipitation regulator in the cooling process, further, the wax crystals are prevented from being aggregated and grown on the wall of an oil pipe and a sucker rod, simultaneously, the crystallization form of the paraffin in the crude oil can be changed, the wax crystals are suspended in light components, the apparent freezing point of the wax crystals is greatly reduced, the structural strength is reduced, and the low-temperature fluidity of the wax crystals is improved, thereby achieving the purpose of realizing low-temperature conveying in the processes of paraffin prevention and pipe conveying in the lifting process. On the basis of determining the wax control and pour point depression mechanism, analyzing the wax components of the crude oil by adopting a gas chromatography, and determining a formula of a regulating agent according to an analysis result; and then determining the dosage and the adding mode of the regulating agent according to the determined formula of the regulating agent and the influence degree of the regulating agent on the oil product quality before and after the regulating agent is added.
Further, step S1 specifically includes: and analyzing the distribution condition of wax molecules with different carbon chains in the crude oil in different blocks to determine the formula of the regulating agent.
The distribution conditions of the paraffin molecule crude oil with different carbon chains in the crude oil of different blocks have certain requirements on the functional groups of each component in the regulating agent and the proportion of each component, so that the wax component in the crude oil needs to be analyzed by adopting a gas chromatography firstly to analyze the distribution conditions of the wax molecules with different carbon chains in the crude oil of different blocks.
Further, the oil quality includes oil yield value, low temperature fluidity and wax control rate.
The yield value, low-temperature fluidity and wax-proof rate of the oil product can be obviously influenced by the dosing concentration of different regulating agents, so that the dosing concentration of the regulating agent is determined according to specific parameters of the oil product quality during actual dosing so as to realize the effects of wax prevention and pour point depression on the basis of ensuring the oil product quality.
Further, the adding mode adopts a continuous quantitative dripping mode.
Research shows that the petroleum wax precipitation regulating agent adopts a continuous quantitative dripping adding mode in an oil production well and a cold transportation pipeline, so that the wax control cost can be saved, a good wax control effect can be achieved, and the continuous quantitative adding mode is particularly important for an oil well with low working fluid level and insufficient liquid supply.
The application of the wax precipitation regulator in crude oil extraction also belongs to the protection scope of the invention.
Compared with the prior art, the wax precipitation regulating agent has the following technical effects:
the wax precipitation regulating agent comprises polycyclic aromatic hydrocarbon, a comb-shaped polymer and a stabilizer, wherein before wax precipitation of the polycyclic aromatic hydrocarbon in crude oil, a plurality of pseudo wax crystal nuclei are provided for wax precipitation in the crude oil in advance as crystal nucleus attachment points of the wax, so that the paraffin is precipitated on the crystal nucleus of the polycyclic aromatic hydrocarbon, and the polycyclic aromatic hydrocarbon molecules of the wax crystal seeds influence the arrangement of the wax crystal, so that the crystal nucleus of the wax crystal is distorted and deformed, the wax crystal is not beneficial to continuous growth and development of the wax crystal, and the wax crystal after eutectic is not beneficial to continuous attachment on a solid boundary, so that the wax control effect is achieved; the main chain or the side chain of the comb polymer has a structure and a polar group similar to paraffin molecules, so that the comb polymer can form eutectic with the paraffin molecules at low temperature, and is not beneficial to continuous growth of the wax crystals; the stabilizer can promote the polycyclic aromatic hydrocarbon and the comb-shaped polymer to be fully dissolved in the wax-containing crude oil, thereby better playing the regulating and controlling role. Therefore, the petroleum wax precipitation regulating agent has the functions of wax prevention and pour point depression, is not influenced by the water content of crude oil, and cannot influence the dehydration of a combined station even if the regulating agent is used in a large area. In addition, the regulating agent is oil-based liquid, does not cause clay expansion, has the advantages of no toxicity, high flash point and the like, and improves the safety factor in the use process.
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 other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic view of the continuous quantitative dosing mode of the cannula according to the present invention;
FIG. 2 is a chart of chromatographic analysis of different carbon chain waxes in crude oil according to the present invention;
FIG. 3 is a bar graph of different carbon chain wax contents in crude oil according to the present invention;
FIG. 4 is a viscosity-temperature curve of crude oil according to the present invention before and after dosing;
FIG. 5 is a schematic diagram showing the change of the freezing point curve during the dosing period according to the present invention;
FIG. 6 is a schematic diagram showing the change of wax deposition point during the application of chemicals in the present invention.
Description of reference numerals:
1: a dosing box; 2: a drip dosing pump; 3: an oil well; 4: heating furnace; 5: a separator.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms also include the plural forms unless the context clearly dictates otherwise, and further, it is understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of the stated features, steps, operations, devices, components, and/or combinations thereof.
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, 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.
Test examples
S1, taking a certain oil well as an example, analyzing the distribution condition of wax molecules with different carbon chains in crude oil in the crude oil, and determining the formula of the regulating agent;
the method is characterized in that the distribution of wax molecules with different carbon chains in crude oil of a well in the crude oil is analyzed by adopting a gas chromatography, wherein fig. 2 and fig. 3 are a chromatographic analysis chart of wax with different carbon chains in the crude oil and a bar chart of the content of the wax with different carbon chains in the crude oil respectively.
As can be seen from FIGS. 2 and 3, the carbon chain length of the wax in the crude oil is 20 to 38, the content of C24 straight chain hydrocarbon (paraffin) is the highest, and the wax is mainly composed of C22 to C29 wax. The crude oil should adopt a regulator containing ethylene-methacrylate copolymer, and ester group of the ethylene-methacrylate is selected from straight chain hydrocarbon of C22-C29, and can be eutectic with wax of C22-C29 in the crude oil. Meanwhile, anthracene or tetracene is required to be added in the formula so as to carry out eutectic crystallization on the wax with the carbon chain length of the crude oil except the C22-C29 wax. Of course, the final wax control formulation needs to be determined by laboratory tests for different types of crude oils.
Thus, the formula of the wax precipitation regulator applied to the oil well is determined as follows:
15% of ethylene-acrylic ester copolymer, 15% of ethylene-methacrylate copolymer, 30% of polycyclic aromatic hydrocarbon and 40% of kerosene.
S2, determining the dosage and adding mode of the regulating agent according to the determined formula of the regulating agent and the influence of the regulating agent on the oil quality before and after the regulating agent is added, wherein the oil quality comprises the yield value, the low-temperature fluidity and the wax control rate.
Namely, the optimal dosage and the adding mode of the regulating agent are determined according to the determined formula of the regulating agent and the influence of different adding concentrations of the regulating agent on the quality of the oil product. Wherein, the table 1 is an analysis data table of the yield value and the viscosity of the crude oil before and after the addition of the chemicals, and the table 2 is an analysis data table of the wax control rate before and after the addition of the chemicals.
TABLE 1 analysis data table of yield value and viscosity of crude oil before and after adding chemicals
TABLE 2 analytical data sheet for wax control before and after dosing
As can be seen from Table 1, the control results of different dosing concentrations on the yield value and the viscosity of the crude oil are different, when the dosing concentration is 1kg/t, the original solidification point is 22.5 ℃, the test temperature is 16 ℃, the yield value is reduced from 643Pa to 15.8Pa after dosing, the reduction range is 97.5%, the viscosity is 273 mPas after dosing, which is only 9.62% of the original viscosity of 2836 mPas, and when the dosing concentration is 2kg/t, the dispersion effect is poor. Meanwhile, the invention also adopts a GF401 type paraffin deposition tester to test the wax deposition condition of the wax deposition tube before and after adding the medicine, and the table 2 shows that the wax control rate can reach 61.12 percent when the adding concentration is 1 kg/t. Therefore, the optimal use concentration of the well wax precipitation regulator is 0.1 percent of the daily yield of the crude oil.
In this test example, the low-temperature flow effect of the crude oil after the addition of the chemicals was also studied, and fig. 4 is a viscosity-temperature curve before and after the addition of the chemicals.
As can be seen from FIG. 4, the crude oil viscosity decreased from 1576 mPas to 56 mPas at a temperature of 6 ℃ when the addition was carried out at a concentration of 0.6 kg/t. Therefore, the wax precipitation regulating agent can obviously improve the low-temperature fluidity of the crude oil.
In order to determine the optimal dosing mode for field application, a tracer test is carried out, and the dosing modes of twice every day and four times every day are respectively adopted under the condition that the dosing quantity is unchanged during the test. Tests show that under the condition of the same dosage, the more times the medicament is added, the smaller the interval is, and the better the wax-proof and pour-point-reducing effects are. Therefore, the dosing process of the wax precipitation regulating agent adopts the best continuous quantitative dosing mode, not only can save the cost of the regulating agent, but also can achieve good wax prevention effect. Especially for the original oil well with low working fluid level and insufficient liquid supply, the continuous quantitative dosing mode is more important.
FIG. 5 and FIG. 6 record the freezing point change and the wax point change during the dosing period, respectively, wherein it can be seen from FIG. 5 that the freezing point of the produced crude oil floats between 2 ℃ and 30 ℃ when dosing is performed twice a day under the condition that the dosing amount is not changed; the crude oil is fed four times a day in a mode of keeping the dosage unchanged from 4 months to 30 days, and the freezing point of the extracted crude oil floats between 6 and 12 ℃ after the crude oil is stabilized, so that the continuous and quantitative feeding of the crude oil can make the wax-proof and pour-point depression of the crude oil fully exerted. As can be seen from fig. 6, after the dosing was stopped at 5 months and 7 days, the wax precipitation point in the oil well increased significantly relative to the dosing period, and it was found that the wax precipitation controlling agent of the present invention had excellent wax control and pour point depressing effects.
In addition, in order to evaluate the pour point depressing effect of the wax precipitation regulating agent, the pour point depressing amplitude of the regulating agent on the crude oil well and the influence on the well washing period are measured in the test example. Wherein, table 3 is the pour point depression amplitude test result of the crude oil well, and table 4 is the technical application condition of the wax precipitation regulator.
Table 3 shows the results of the pour point depression test of the crude oil well
As can be seen from Table 3, after the drugs are added into the crude oil in the three blocks, the pour point depressing range is all above 16 ℃, which shows that the wax precipitation regulating agent has good wax crystal dispersion effect on the crude oil in the three blocks.
Table 4 shows the application of wax precipitation control agent technology
As can be seen from Table 4, the paraffin control periods of the seven test wells are all more than 450 days, which is much longer than the pump inspection period of 280-320 days of the block, and it is shown that the oil wells of the block can be produced normally in the pump inspection period only by continuously and quantitatively adding the paraffin precipitation regulating agent without any paraffin removal operation.
The test examples show that the wax precipitation regulating agent disclosed by the invention not only has an excellent pour point depressing effect, but also has a good wax prevention effect. And because the wax control mechanism is that a substance which can form eutectic with wax crystals and uniformly disperse the wax crystals is put into the crude oil, the wax control and pour point depression effects are not influenced by the water content of the crude oil, and the agent does not contain a surfactant, so that the dehydration of the united station cannot be influenced even if the agent is used in a large area. In addition, the wax precipitation regulating agent is oil-based liquid, cannot cause clay expansion, has the advantages of no toxicity, high flash point and the like, and greatly improves the safety factor in the use process. And the casing is used for dosing in a continuous and quantitative dropping dosing mode, so that the wax control of the shaft of the oil well in the whole block can be realized, and the oil pipeline from the wellhead to the metering station, from the metering station to the oil transfer station and from the oil transfer station to the combined station can be subjected to full-line pour point depressing and low-temperature conveying. Therefore, the daily maintenance work of the oil extraction pump is reduced, and the service life of the pipeline is prolonged.
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 (6)
1. The petroleum wax precipitation regulating agent is characterized by comprising the following components in parts by weight: 20-60 parts of polycyclic aromatic hydrocarbon, 20-60 parts of comb polymer and 10-80 parts of stabilizer;
the stabilizer is one or a mixture of more of petroleum ether, diesel oil, kerosene, naphtha, n-heptane, n-hexane or cyclohexane in any proportion;
the comb polymer is one or a composition of two of ethylene-acrylic ester copolymer and ethylene-methacrylate copolymer.
2. The wax precipitation modifier of claim 1, wherein the polycyclic aromatic hydrocarbon is a compounded composition of any one or more of cycloalkane, anthracene, or tetracene in any ratio.
3. The method of using the wax precipitation modifier of any one of claims 1-2, comprising the steps of:
s1, analyzing wax components of the crude oil, and determining a formula of a regulator according to an analysis result, wherein the carbon chain length of the wax in the crude oil of the oil well is 20-38, the content of straight chain hydrocarbon of C24 is the highest, the wax mainly comprises C22-C29 wax, the regulator containing ethylene-methacrylate copolymer is selected, and the ester group of the ethylene-methacrylate is selected from C22-C29 straight chain hydrocarbon;
s2, determining the dosage and the adding mode of the regulating agent according to the determined formula of the regulating agent and the influence of the regulating agent on the quality of the oil product before and after the regulating agent is added.
4. The use method of claim 3, wherein in step S2, the oil quality includes oil yield value, low temperature fluidity and wax control rate.
5. The use method according to claim 3, wherein in step S2, the adding mode is a continuous quantitative dripping mode.
6. Use of the wax precipitation modifier of any one of claims 1-2 in crude oil recovery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010729221.8A CN111826145B (en) | 2020-07-27 | 2020-07-27 | Petroleum wax precipitation regulating and controlling agent and using method and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010729221.8A CN111826145B (en) | 2020-07-27 | 2020-07-27 | Petroleum wax precipitation regulating and controlling agent and using method and application thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111826145A CN111826145A (en) | 2020-10-27 |
| CN111826145B true CN111826145B (en) | 2021-03-19 |
Family
ID=72925591
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010729221.8A Active CN111826145B (en) | 2020-07-27 | 2020-07-27 | Petroleum wax precipitation regulating and controlling agent and using method and application thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111826145B (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1360016A (en) * | 2000-12-22 | 2002-07-24 | 中国石油天然气股份有限公司 | Liquid pour point depressant for crude oil and preparation method thereof |
| CN1508214A (en) * | 2002-12-13 | 2004-06-30 | 冀东石油勘探开发公司 | Oil well viscosity-reducing agent |
| CN101210173A (en) * | 2006-12-28 | 2008-07-02 | 富顺集团控股有限公司 | Highly effective pour depressant for thermodynamic oil extraction process |
| CN101240701A (en) * | 2007-02-07 | 2008-08-13 | 钜力集团有限公司 | Non-strong water-sensitive special oil reservoir heating power oil extraction method |
| CN101240702A (en) * | 2007-02-09 | 2008-08-13 | 钜力集团有限公司 | Oil layer coagulating type oil reservoir mining method |
| CN102504796A (en) * | 2011-11-25 | 2012-06-20 | 北京迪威尔石油天然气技术开发有限公司 | Flow modifier for high-solidifying-point high-viscosity crude oil |
| CN104837871A (en) * | 2012-12-18 | 2015-08-12 | 巴斯夫欧洲公司 | Polymer formulations in solvents with a high flash point, method for the production thereof and use thereof as pour-point depressants for crude oils, mineral oils or mineral oil products |
| CN105090749A (en) * | 2014-09-19 | 2015-11-25 | 兰德伟业科技集团有限公司 | Nanometer anti-wax pour point depressant |
| CN106047329A (en) * | 2016-06-06 | 2016-10-26 | 中国石油化工股份有限公司 | High-temperature-resistant pour-point depressant and preparation method thereof |
| CN109337010A (en) * | 2018-09-27 | 2019-02-15 | 中国海洋石油集团有限公司 | A kind of pour point depressant for crude oil and preparation method thereof |
-
2020
- 2020-07-27 CN CN202010729221.8A patent/CN111826145B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1360016A (en) * | 2000-12-22 | 2002-07-24 | 中国石油天然气股份有限公司 | Liquid pour point depressant for crude oil and preparation method thereof |
| CN1508214A (en) * | 2002-12-13 | 2004-06-30 | 冀东石油勘探开发公司 | Oil well viscosity-reducing agent |
| CN101210173A (en) * | 2006-12-28 | 2008-07-02 | 富顺集团控股有限公司 | Highly effective pour depressant for thermodynamic oil extraction process |
| CN101240701A (en) * | 2007-02-07 | 2008-08-13 | 钜力集团有限公司 | Non-strong water-sensitive special oil reservoir heating power oil extraction method |
| CN101240702A (en) * | 2007-02-09 | 2008-08-13 | 钜力集团有限公司 | Oil layer coagulating type oil reservoir mining method |
| CN102504796A (en) * | 2011-11-25 | 2012-06-20 | 北京迪威尔石油天然气技术开发有限公司 | Flow modifier for high-solidifying-point high-viscosity crude oil |
| CN104837871A (en) * | 2012-12-18 | 2015-08-12 | 巴斯夫欧洲公司 | Polymer formulations in solvents with a high flash point, method for the production thereof and use thereof as pour-point depressants for crude oils, mineral oils or mineral oil products |
| CN105090749A (en) * | 2014-09-19 | 2015-11-25 | 兰德伟业科技集团有限公司 | Nanometer anti-wax pour point depressant |
| CN106047329A (en) * | 2016-06-06 | 2016-10-26 | 中国石油化工股份有限公司 | High-temperature-resistant pour-point depressant and preparation method thereof |
| CN109337010A (en) * | 2018-09-27 | 2019-02-15 | 中国海洋石油集团有限公司 | A kind of pour point depressant for crude oil and preparation method thereof |
Non-Patent Citations (2)
| Title |
|---|
| 库-鄯输油管道大落差压力控制工艺;韩忠晨;《石油规划设计》;19980730(第04期);14-16 * |
| 柴油降凝剂的成份分析与比较;张宏喜等;《新疆大学学报(自然科学版)》;20040801;第21卷(第03期);282-284 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111826145A (en) | 2020-10-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Taraneh et al. | Effect of wax inhibitors on pour point and rheological properties of Iranian waxy crude oil | |
| CN101210173B (en) | Highly effective pour depressant for thermodynamic oil extraction process | |
| US10851288B2 (en) | Method for fracturing a subterranean geological formation with an emulsified acid | |
| CN101381640B (en) | Ternary polymer composite petroleum pour point depressant and preparation method thereof | |
| CN111320975B (en) | Emulsion type high-wax-content crude oil pour point depression drag reducer and preparation method thereof | |
| US4045360A (en) | Inhibiting wax deposition from a wax-containing oil | |
| CN114560967B (en) | Preparation method of low-temperature anti-freezing emulsion polymer thickening agent for fracturing | |
| CN109321222B (en) | Emulsion type paraffin remover and preparation method and application thereof | |
| CN102876306A (en) | Asphaltene deposit dispersant | |
| RU2711435C2 (en) | Compositions and methods for solving problems with paraffins and asphaltenes in wells | |
| CN111826145B (en) | Petroleum wax precipitation regulating and controlling agent and using method and application thereof | |
| CN101735788B (en) | Pour point depressant for crude oil | |
| CN116535568B (en) | Wax inhibitor and preparation method and application thereof | |
| Taiwo et al. | Crude oil transportation: Nige-rian Niger delta waxy crude | |
| CN115975611B (en) | Wax removal preventing agent for drilling fluid and preparation method and application thereof | |
| CN113930225B (en) | Wax crystal dispersing agent for reviving high-wax-content condensate gas reservoir and preparation method thereof | |
| CN109306281A (en) | A kind of pour depressant for lubricating oil and preparation method thereof | |
| CN111849449B (en) | Supercritical CO2Oil displacement system and oil displacement method | |
| CN108467716A (en) | A kind of oil-base paraffin remover | |
| CN109233942A (en) | It is a kind of for improving the additive and preparation method thereof of lubricating oil low temperature fluidity | |
| US11999899B2 (en) | Solvent blends for enhanced hydrocarbon recovery process methods | |
| WO2022116773A1 (en) | Oil-soluble corrosion inhibitor water agent, and preparation method and regeneration method therefor | |
| CN118048134A (en) | Chemical paraffin remover for condensate oil well paraffin removal and preparation method thereof | |
| CN110283580B (en) | Pour point depressing and paraffin inhibitor and its prepn | |
| CN108570315B (en) | Application of imidazole and/or imidazole derivative, acidified heavy oil viscosity reducer and method for reducing viscosity of acidified heavy oil |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |