CN108424756B - Blockage removal and blockage inhibition agent and application thereof as well as blockage removal and blockage inhibition method in heavy oil recovery - Google Patents
Blockage removal and blockage inhibition agent and application thereof as well as blockage removal and blockage inhibition method in heavy oil recovery Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 33
- 239000003795 chemical substances by application Substances 0.000 title claims description 84
- 230000005764 inhibitory process Effects 0.000 title claims description 48
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- 238000011084 recovery Methods 0.000 title claims description 6
- 230000002401 inhibitory effect Effects 0.000 claims abstract description 52
- 230000000903 blocking effect Effects 0.000 claims abstract description 28
- 239000003921 oil Substances 0.000 claims description 54
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- 150000004945 aromatic hydrocarbons Chemical class 0.000 claims description 24
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 claims description 16
- -1 nitrogen-containing compound Chemical class 0.000 claims description 16
- PSZYNBSKGUBXEH-UHFFFAOYSA-N naphthalene-1-sulfonic acid Chemical compound C1=CC=C2C(S(=O)(=O)O)=CC=CC2=C1 PSZYNBSKGUBXEH-UHFFFAOYSA-N 0.000 claims description 14
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims description 11
- 239000003129 oil well Substances 0.000 claims description 11
- UFWIBTONFRDIAS-UHFFFAOYSA-N Naphthalene Chemical compound C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 claims description 10
- 150000001412 amines Chemical class 0.000 claims description 10
- 230000015572 biosynthetic process Effects 0.000 claims description 9
- 239000003112 inhibitor Substances 0.000 claims description 9
- KYQCOXFCLRTKLS-UHFFFAOYSA-N Pyrazine Chemical compound C1=CN=CC=N1 KYQCOXFCLRTKLS-UHFFFAOYSA-N 0.000 claims description 8
- KAESVJOAVNADME-UHFFFAOYSA-N Pyrrole Chemical compound C=1C=CNC=1 KAESVJOAVNADME-UHFFFAOYSA-N 0.000 claims description 6
- PAFZNILMFXTMIY-UHFFFAOYSA-N cyclohexylamine Chemical compound NC1CCCCC1 PAFZNILMFXTMIY-UHFFFAOYSA-N 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- CZPWVGJYEJSRLH-UHFFFAOYSA-N Pyrimidine Chemical compound C1=CN=CN=C1 CZPWVGJYEJSRLH-UHFFFAOYSA-N 0.000 claims description 5
- JYYNAJVZFGKDEQ-UHFFFAOYSA-N 2,4-Dimethylpyridine Chemical compound CC1=CC=NC(C)=C1 JYYNAJVZFGKDEQ-UHFFFAOYSA-N 0.000 claims description 4
- KDSNLYIMUZNERS-UHFFFAOYSA-N 2-methylpropanamine Chemical compound CC(C)CN KDSNLYIMUZNERS-UHFFFAOYSA-N 0.000 claims description 4
- PCNDJXKNXGMECE-UHFFFAOYSA-N Phenazine Natural products C1=CC=CC2=NC3=CC=CC=C3N=C21 PCNDJXKNXGMECE-UHFFFAOYSA-N 0.000 claims description 4
- WGQKYBSKWIADBV-UHFFFAOYSA-N aminomethyl benzene Natural products NCC1=CC=CC=C1 WGQKYBSKWIADBV-UHFFFAOYSA-N 0.000 claims description 4
- 150000001555 benzenes Chemical class 0.000 claims description 4
- 150000002790 naphthalenes Chemical class 0.000 claims description 4
- PBMFSQRYOILNGV-UHFFFAOYSA-N pyridazine Chemical compound C1=CC=NN=C1 PBMFSQRYOILNGV-UHFFFAOYSA-N 0.000 claims description 4
- JUJWROOIHBZHMG-UHFFFAOYSA-N pyridine Substances C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 claims description 4
- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 claims description 3
- BMVXCPBXGZKUPN-UHFFFAOYSA-N 1-hexanamine Chemical compound CCCCCCN BMVXCPBXGZKUPN-UHFFFAOYSA-N 0.000 claims description 2
- RPVYMRBTVNNTGY-UHFFFAOYSA-N 2-hexyl-1h-pyrrole Chemical compound CCCCCCC1=CC=CN1 RPVYMRBTVNNTGY-UHFFFAOYSA-N 0.000 claims description 2
- MHZGKXUYDGKKIU-UHFFFAOYSA-N Decylamine Chemical compound CCCCCCCCCCN MHZGKXUYDGKKIU-UHFFFAOYSA-N 0.000 claims description 2
- 150000003939 benzylamines Chemical class 0.000 claims description 2
- HQABUPZFAYXKJW-UHFFFAOYSA-N butan-1-amine Chemical compound CCCCN HQABUPZFAYXKJW-UHFFFAOYSA-N 0.000 claims description 2
- MGHPNCMVUAKAIE-UHFFFAOYSA-N diphenylmethanamine Chemical compound C=1C=CC=CC=1C(N)C1=CC=CC=C1 MGHPNCMVUAKAIE-UHFFFAOYSA-N 0.000 claims description 2
- JRBPAEWTRLWTQC-UHFFFAOYSA-N dodecylamine Chemical compound CCCCCCCCCCCCN JRBPAEWTRLWTQC-UHFFFAOYSA-N 0.000 claims description 2
- IOQPZZOEVPZRBK-UHFFFAOYSA-N octan-1-amine Chemical compound CCCCCCCCN IOQPZZOEVPZRBK-UHFFFAOYSA-N 0.000 claims description 2
- 150000003222 pyridines Chemical class 0.000 claims description 2
- BZVJOYBTLHNRDW-UHFFFAOYSA-N triphenylmethanamine Chemical compound C=1C=CC=CC=1C(C=1C=CC=CC=1)(N)C1=CC=CC=C1 BZVJOYBTLHNRDW-UHFFFAOYSA-N 0.000 claims description 2
- 238000000605 extraction Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 description 20
- 239000012188 paraffin wax Substances 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 7
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 6
- 238000004090 dissolution Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000011160 research Methods 0.000 description 5
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- 239000002904 solvent Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 239000001993 wax Substances 0.000 description 4
- 239000000084 colloidal system Substances 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 229930195734 saturated hydrocarbon Natural products 0.000 description 3
- 239000004094 surface-active agent Substances 0.000 description 3
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- 230000008859 change Effects 0.000 description 2
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- 150000007524 organic acids Chemical class 0.000 description 2
- 235000005985 organic acids Nutrition 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
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- 238000005303 weighing Methods 0.000 description 2
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000003849 aromatic solvent Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 229940125904 compound 1 Drugs 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
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- 238000004821 distillation Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 150000008282 halocarbons Chemical class 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
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- 239000003607 modifier Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000002798 polar solvent Substances 0.000 description 1
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- 239000013049 sediment Substances 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/52—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
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- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Physics & Mathematics (AREA)
- General Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Geochemistry & Mineralogy (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Lubricants (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
Abstract
The invention relates to the field of oil field oil extraction engineering, and discloses a blockage removing and blocking inhibiting agent, application thereof and a blockage removing and blocking inhibiting method in thick oil extraction.
Description
Technical Field
The invention relates to the field of oil field oil extraction engineering, in particular to a blockage removing and inhibiting agent and application thereof, a blockage removing method in thick oil exploitation and a blockage inhibiting method in thick oil exploitation.
Background
The heavy oil contains more asphaltine, colloid and paraffin, which are easy to separate out along with the change of pressure and temperature during the exploitation process, and adhere to the oil well and pipeline to cause blockage.
Paraffin is generally the main component of oil well plugs, but for heavy oil with higher asphaltene content, the plugs tend to contain large amounts of asphaltenes. In the production process of high-asphaltene thick oil, the conditions that the proportion of saturated hydrocarbon and aromatic hydrocarbon is not proper or the proportion of colloid and asphaltene is not matched often occur, and when the temperature and the pressure are reduced to a certain degree, the asphaltene can be separated out. The mixed precipitate consisting of asphaltenes, colloids and paraffins has a great influence on the normal production process.
The common wax-removing and blocking-removing agents include three types, namely oil-based, water-based and emulsion-based. The main component of the oil-based paraffin remover is an organic solvent with good dissolving effect on wax, the water-based paraffin remover is mainly aqueous dispersion of a surfactant and an alkaline inorganic substance, and the emulsion type paraffin remover is mainly aqueous solution of an organic solvent taking water as an external phase. The paraffin removal agents of the types have good effects on dissolving, pour point depressing and precipitation prevention of wax crystals, but have poor effects on precipitates with high asphaltene content, and cannot meet production requirements.
CN1456634A describes a water-based paraffin removal and prevention agent, which mainly comprises a wax crystal modifier and a surfactant, is suitable for removing wax from a high-wax-content oil well, but has poor effect on dissolving asphaltene, and is not suitable for some oil wells with higher asphaltene content.
CN1232855A describes a paraffin remover consisting of hydrocarbons, halogenated hydrocarbons and a surfactant, which has the characteristics of high paraffin dissolving speed, high paraffin dissolving amount, low condensation point and the like, but is not suitable for oil wells with high asphaltene content.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a blockage removing and inhibiting agent and application thereof, a blockage removing method in thickened oil exploitation and a blockage inhibiting method in thickened oil exploitation. The blockage removing and inhibiting agent is particularly suitable for removing the blockage (such as a shaft blockage and a pipeline blockage) generated in the process of high-asphaltene thick oil exploitation, and can effectively inhibit the formation of the blockage.
The inventor of the invention finds in research that: heavy oil generally contains more asphaltenes, the main component of wellbore plugs is also asphaltenes, and some types of plugs have asphaltene content of more than 50%, such as thick oil wellbore plugs in the ten regions of the Tahe oil field. Aromatics and distillates are often used as asphaltene solvents. However, because the molecular structure of asphaltene contains more polar groups and the intermolecular polar force is stronger, in non-polar or weakly polar solvents such as aromatic hydrocarbon and distillate oil, asphaltene molecules are generally aggregated together and exist in the form of aggregates, and the size and stability of the aggregate particles are changed along with the change of the asphaltene concentration. According to the prior art, in toluene, asphaltenes are stabilized in the form of nano-aggregates having a particle size of less than 100nm only at concentrations of less than 0.5%, whereas larger aggregates are formed at concentrations of more than 5%, which are not stabilized in the solvent and are liable to sediment.
If only aromatic hydrocarbon solvents are used as the blocking remover, such as toluene, xylene, distillate oil, etc., although they have high permeability and can rapidly penetrate into the inside of the asphaltene plug to be dissolved and dispersed, a very large amount of solvent is required to sufficiently dissolve the asphaltene plug and prevent the asphaltene from being redeposited and forming new plug, and therefore, the use cost is very high.
The inventor of the present invention further found in research that low-cost coal tar and α -naphthalenesulfonic acid are used as components of the blockage removal and inhibition agent, and specific contents are controlled, so that a good synergistic effect can be achieved, and not only can asphaltene blockage be dissolved with a low usage amount, but also blockage can be effectively prevented from being reformed, wherein the coal tar contains a large amount of aromatic hydrocarbons, especially small-molecule aromatic hydrocarbons with a boiling point lower than 300 ℃, so that good asphaltene dissolution is achieved, and nitrogen-containing compounds are also present in the coal tar, and have certain polarity, and can be combined with polar groups of asphaltene molecules through dipolar action force, hydrogen bonds and the like, so that interaction between asphaltene molecules is shielded, and formation of large-particle asphaltene aggregates is avoided.
Accordingly, in order to achieve the above object, the present invention provides, in a first aspect, a deblocking inhibitor comprising coal tar and α -naphthalenesulfonic acid, wherein the content of α -naphthalenesulfonic acid is 0.1 to 5% by weight, based on the weight of the deblocking inhibitor.
In a second aspect, the invention provides the use of the blockage removal and inhibition agent of the invention in dissolving and/or inhibiting the formation of thick oil wellbore plugs.
In a third aspect, the present invention provides a method for removing blockage in thick oil recovery, which comprises: the blockage removing and inhibiting agent disclosed by the invention is contacted with a blockage.
In a fourth aspect, the present invention provides a method for inhibiting blockage in thick oil production, comprising: the blockage removing and blocking inhibiting agent is injected into an oil well to contact with thick oil.
The blockage removing and inhibiting agent contains coal tar and α -naphthalene sulfonic acid, wherein the content of α -naphthalene sulfonic acid is 0.1-5 wt%, the combination combines the dissolving capacity of the coal tar to asphaltene and the dispersing and stabilizing capacity of α -naphthalene sulfonic acid to asphaltene, the cost is low, the optimal blockage removing and inhibiting effect can be achieved, the blockage removing and inhibiting agent has a good dissolving and removing effect on thick oil well shaft blockage and pipeline blockage with high asphaltene content, the formation of the blockage can be well inhibited, and the blockage removing and inhibiting agent is particularly suitable for the exploitation of high asphaltene thick oil wells.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Detailed Description
The following describes in detail specific embodiments of the present invention. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
In a first aspect, the invention provides a blockage removing and inhibiting agent, which contains coal tar and α -naphthalene sulfonic acid, wherein the content of α -naphthalene sulfonic acid is 0.1-5 wt% based on the weight of the blockage removing and inhibiting agent.
Among them, in the blockage removing and inhibiting agent of the invention, those skilled in the art can understand that, for asphaltenes with different properties, the appropriate α -naphthalenesulfonic acid content can be selected within the above-mentioned α -naphthalenesulfonic acid content range to better achieve the blockage removing and inhibiting effect, for example, if the asphaltenes have larger polarity, α -naphthalenesulfonic acid with slightly higher content can be selected, and if the asphaltenes have smaller polarity, α -naphthalenesulfonic acid with slightly lower content can be selected.
In the plugging removal and inhibition agent of the present invention, the inventors of the present invention further found in their research that the boiling point of aromatic hydrocarbons and nitrogen-containing compounds contained in coal tar increases with the increase of molecular weight, and the ability of the aromatic hydrocarbons and nitrogen-containing compounds to dissolve and disperse asphaltenes generally decreases, so that if the content of small molecular compounds in the fraction below 300 ℃ in coal tar is too low, the plugging removal and inhibition effect will be significantly reduced. Therefore, in order to further enhance the deblocking and plugging suppressing effect of the deblocking and plugging suppressing agent, the content of fractions at 300 ℃ or lower in coal tar is preferably not less than 15% by weight, more preferably 15 to 30% by weight, and still more preferably 16 to 25% by weight, based on the weight of coal tar. The fraction below 300 ℃ in coal tar is not particularly limited, and may be various fractions below 300 ℃ commonly contained in coal tar, and may include, for example, saturated hydrocarbons, aromatic hydrocarbons, organic acids, heterocyclic compounds, organic amines, and the like, and specific types of the fractions are well known to those skilled in the art and will not be described herein again.
In the blockage removing and inhibiting agent of the invention, the inventor of the invention further discovers in research that aromatic hydrocarbon in coal tar mainly serves as a dissolving medium of asphaltene, and if the content of aromatic hydrocarbon is too low, the total amount of the asphaltene capable of being dissolved is reduced. Therefore, in order to further enhance the deblocking and plugging suppressing effect of the deblocking and plugging suppressing agent, the aromatic hydrocarbon content of the coal tar is preferably not less than 60% by weight, more preferably 60 to 90% by weight, and still more preferably 62 to 85% by weight, based on the weight of the coal tar.
Among them, the aromatic hydrocarbon is preferably an aromatic hydrocarbon of C6 to C20, and more preferably includes at least one of benzene, naphthalene, a derivative of benzene of C6 to C20, and a derivative of naphthalene of C6 to C20, and for example, the derivative of benzene of C6 to C20 may be a hydrocarbyl-substituted benzene, and the derivative of naphthalene of C6 to C20 is a hydrocarbyl-substituted naphthalene.
In the plugging removal and inhibition agent of the present invention, the inventors of the present invention further found in their research that the nitrogen-containing compound in the coal tar is a good asphaltene dispersing and dissolving agent, and has the function of dispersing and stabilizing asphaltenes, and if the content of the nitrogen-containing compound in the coal tar is too low, the overall function effect of the plugging removal and inhibition agent will be reduced. Therefore, in order to further improve the deblocking and plugging inhibitory effect of the deblocking and plugging inhibitor, the content of the nitrogen-containing compound in the coal tar is preferably not less than 0.5% by weight, more preferably 0.5 to 15% by weight, and still more preferably 2 to 10% by weight, based on the weight of the coal tar.
Preferably, the nitrogen-containing compound comprises at least one of organic amine and nitrogen-containing heterocyclic compound, further preferably, the organic amine is organic amine with molecular weight less than 200, and still further preferably at least one of substituted or unsubstituted benzylamine, benzhydrylamine, tritylamine, n-butylamine, isobutylamine, dodecylamine, n-hexylamine, cyclohexylamine, n-octylamine and n-decylamine; the nitrogen-containing heterocyclic compound is a nitrogen-containing heterocyclic compound with a molecular weight of less than 200, is preferably at least one of substituted or unsubstituted pyridine, pyrrole, pyrazine, pyridazine and pyrimidine, and is preferably at least one of 2, 4-dimethylpyridine, 2-hexylpyrrole, pyrazine, pyridazine and pyrimidine.
In the blockage removing and blocking inhibiting agent, low-cost coal tar is used, so that the overall cost of the blockage removing and blocking inhibiting agent is lower. In addition, in order to seek more excellent blockage removing and inhibiting effects, at least one of certain fractions at the temperature of below 300 ℃, aromatic hydrocarbons of C6-C20 and nitrogen-containing compounds (at least one of the organic amine and the nitrogen-containing heterocyclic compound) contained in coal tar can be additionally added into the blockage removing and inhibiting agent.
In the blocking remover of the present invention, the preparation method of the blocking remover is not particularly limited, as long as the components are mixed according to the content ratio.
The blockage removing and inhibiting agent can be used for well flushing blockage removal (namely removing and dissolving blockage) and can also be used for preventing the formation of the blockage.
In a second aspect, the invention provides the use of the blockage removal and inhibition agent of the invention in dissolving and/or inhibiting the formation of thick oil wellbore plugs.
Preferably, the heavy oil wellbore plug has an asphaltene content of greater than 40 wt% based on the weight of the heavy oil wellbore plug. For the plug with low asphaltene content, the effective dissolving effect can be achieved by adopting a common aromatic solvent. The blockage removing and inhibiting agent is most effective for thick oil well bore plugs with asphaltene content of more than 40%.
In a third aspect, the present invention provides a method for removing blockage in thick oil recovery, which comprises: the blockage removing and inhibiting agent disclosed by the invention is contacted with a blockage. The aforementioned plug may comprise at least one of a thick oil wellbore plug and a thick oil line plug.
In the method of the present invention, preferably, the means for contacting the blockage removal and inhibition agent with the blockage comprises: directly mixing the blockage removing and inhibiting agent with the blockage, or
The blocking removal and inhibition agent is mixed with the thin oil, and then the thin oil containing the blocking removal and inhibition agent is mixed with the blocking object.
In the method of the present invention, the content of asphaltenes in the plug is preferably greater than 40% by weight, based on the weight of the plug.
In the method of the present invention, preferably, the conditions under which the deblocking and blockage-inhibiting agent is contacted with the blockage include: the contact temperature is 10-140 ℃, and the preferable temperature is 40-140 ℃; the contact time is 1 to 10 hours, preferably 2 to 6 hours.
In the method of the present invention, the mixing ratio of the blocking remover and the plug is not particularly limited, and may be various ratios commonly used in the art, and preferably, the weight ratio of the blocking remover to the plug is 0.4 to 1: 1.
in the method, the thin oil with lower viscosity can ensure that the blockage removing and inhibiting agent is easily and uniformly dispersed in the thin oil, and the effect of removing and inhibiting blockage can be more fully exerted. Therefore, the viscosity of the thin oil is preferably less than 300 mPas at 50 ℃.
In the method of the present invention, it is preferable that the content of the blocking remover in the thin oil containing the blocking remover mixed with the clogging is 0.1 to 5% by weight.
In a fourth aspect, the present invention provides a method for inhibiting blockage in thick oil production, comprising: the blockage removing and blocking inhibiting agent is injected into an oil well to contact with thick oil.
In the method of the present invention, preferably, the contacting of the blockage removing and inhibiting agent with the thick oil comprises: directly mixing the blockage removing and inhibiting agent with the thickened oil, or,
the blocking removing and inhibiting agent is mixed with the thin oil, and then the thin oil containing the blocking removing and inhibiting agent is mixed with the thick oil.
In the method of the present invention, the mixing ratio of the blocking remover and the thick oil is not particularly limited, and may be various ratios commonly used in the art, and preferably, the weight ratio of the blocking remover to the thick oil is from 0.001 to 0.05: 1.
in the method of the present invention, it is preferable that the content of the blocking remover in the thin oil containing the blocking remover mixed with the thick oil is 2 to 10% by weight.
In the method of the present invention, preferably, the conditions for contacting the blockage removing and blocking inhibitor with the thick oil include: the contact temperature is 10 to 140 ℃ and more preferably 40 to 140 ℃.
In the process of the present invention, the viscosity of the thick oil is preferably more than 500 mPas at 50 ℃.
Examples
The present invention will be described in detail below by way of examples, but the present invention is not limited thereto. In the following preparations and examples, the reagents used are commercially available unless otherwise specified, and the methods used are conventional in the art.
The plug samples adopted in the experiment are Tahe oilfield shaft plugs 1# and 2#, wherein the weight of the 1# plug is taken as a reference, and the content of asphaltene in the plugging is 48 wt%; the # 2 plug contained 62 wt% asphaltenes, based on the weight of the plug.
In the following examples and comparative examples, the method of contacting the blockage removal and inhibition agent with the blockage in the conical flask and the effect thereof are adopted to simulate and explain the blockage removal and inhibition method and effect in the actual thick oil exploitation.
Coal tar samples 1# to 6# are adopted in experiments, and a part of samples are subjected to extraction or distillation treatment to remove aromatic hydrocarbons, low-boiling-point fractions or nitrogen-containing compounds, wherein the compositions of the samples are shown in table 1, in each coal tar sample, the fractions below 300 ℃ comprise saturated hydrocarbons, aromatic hydrocarbons, heterocyclic compounds, organic acids, organic amines and the like, the aromatic hydrocarbons comprise benzene, naphthalene, hydrocarbon-substituted derivatives of C6-C20 benzene, hydrocarbon-substituted derivatives of C6-C20 naphthalene and the like, and the nitrogen-containing compounds comprise pyridine, pyrrole, pyrimidine, benzylamine, cyclohexylamine and the like.
TABLE 1 coal tar sample composition
| Numbering | Fraction mass fraction below 300 ℃/% | Mass fraction of aromatic hydrocarbons/%) | Mass fraction/% of nitrogen-containing compound |
| 1# | 24.2 | 81.0 | 2.7 |
| 2# | 19.3 | 71.7 | 5.6 |
| 3# | 16.5 | 64.8 | 8.3 |
| 4# | 18.3 | 52.6 | 10.4 |
| 5# | 14.5 | 62.7 | 9.6 |
| 6# | 19.7 | 73.3 | 0.3 |
Examples 1 to 9 and comparative examples 1 to 10
The examples and comparative examples are intended to illustrate the dissolution effect of different plugging removal inhibitors on the plug.
And (3) plug dissolution test, namely preparing the blockage removal and inhibition agent according to different compositions and proportions, weighing 10g of the blockage removal and inhibition agent into a 100m L conical flask, stirring at a constant temperature of 50 ℃, continuously adding a plug sample until the plug cannot be dissolved, and calculating the total dissolution of the plug which can be dissolved by each g of the blockage removal and inhibition agent, wherein the test results are shown in table 2.
TABLE 2 comparison of plug dissolution
The results in table 2 show that the plugging dissolving amount of the plugging removal and inhibition agent of the formula adopted in the invention is obviously superior to that of the comparative example, and the plugging removal and inhibition agent has an obviously excellent effect of dissolving the plugging.
Comparing the results of examples 1 and 7 to 9, it is understood that the deblocking effect of the deblocking agent can be further improved when the content of fractions having a temperature of 300 ℃ or lower in coal tar is 16 to 25 wt%, the content of aromatic hydrocarbons in coal tar is 62 to 85 wt%, and the content of nitrogen-containing compounds in coal tar is 2 to 10 wt%, based on the weight of coal tar.
Examples 10 to 18 and comparative examples 11 to 20
Each example and comparative example are intended to illustrate the effect of different deblocking and plugging inhibitors on the inhibition of plugs.
The experimental result of the blockage inhibition is shown in table 3, wherein the blockage inhibition experiment comprises the steps of preparing blockage removal and inhibition agents according to different compositions and proportions, weighing 10g of the blockage removal and inhibition agents into a 100m L conical flask, adding blockage exceeding the saturated dissolution amount of the blockage removal and inhibition agents, stirring for a period of time at a constant temperature of 50 ℃ to fully dissolve the blockage, filtering out undissolved residues by using filter paper, placing the blockage solution into a closed volumetric flask, standing at a constant temperature of 50 ℃, regularly observing whether precipitation appears at the bottom of the solution, and calculating the stabilization time of the blockage solution.
Table 3 comparison of plug inhibition effect
The results in table 3 show that the plugging removal and inhibition agent of the present invention has significantly better stability to the plugging than the comparative example, and has significantly excellent effect of inhibiting the formation of the plugging.
Comparing the results of examples 1 and 7 to 9, it is understood that the effect of the deblocking agent on the deblocking can be further improved when the content of fractions having a temperature of 300 ℃ or lower in coal tar is 16 to 25 wt%, the content of aromatic hydrocarbons in coal tar is 62 to 85 wt%, and the content of nitrogen-containing compounds in coal tar is 2 to 10 wt%, based on the weight of coal tar.
The blockage removing and inhibiting agent is particularly suitable for removing the blockage (the blockage with the asphaltene content of more than 40 weight percent) generated in the process of exploiting the high-asphaltene thickened oil, and can effectively inhibit the formation of the blockage.
The preferred embodiments of the present invention have been described in detail, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (22)
1. The blockage removing and inhibiting agent is characterized by comprising coal tar and α -naphthalene sulfonic acid, wherein the content of fractions below 300 ℃ in the coal tar is not lower than 15 wt%, the content of aromatic hydrocarbon in the coal tar is not lower than 60 wt%, the content of nitrogen-containing compounds in the coal tar is not lower than 0.5 wt%, and the content of α -naphthalene sulfonic acid is 0.1-5 wt% based on the weight of the blockage removing and inhibiting agent.
2. The blockage removal and inhibition agent according to claim 1, wherein the content of fractions below 300 ℃ in the coal tar is 15-30 wt% based on the weight of the coal tar.
3. The blockage removal and inhibition agent according to claim 2, wherein the content of fractions below 300 ℃ in the coal tar is 16-25 wt% based on the weight of the coal tar.
4. The blockage removal and inhibition agent according to claims 1 to 3, wherein the content of aromatic hydrocarbon in the coal tar is 60 to 90 weight percent based on the weight of the coal tar.
5. The blockage removal and inhibition agent according to claim 4, wherein the content of aromatic hydrocarbon in the coal tar is 62-85 wt% based on the weight of the coal tar.
6. The blockage removal and inhibition agent according to claim 1, wherein the aromatic hydrocarbon is C6-C20 aromatic hydrocarbon.
7. The blockage removal and inhibition agent according to claim 6, wherein the aromatic hydrocarbon comprises at least one of benzene, naphthalene, hydrocarbyl-substituted benzene, and hydrocarbyl-substituted naphthalene.
8. The blockage removal and inhibition agent according to claims 1 to 3, wherein the content of nitrogen-containing compounds in the coal tar is 0.5 to 15 weight percent based on the weight of the coal tar.
9. The blockage removal and inhibition agent according to claim 8, wherein the content of the nitrogen-containing compound in the coal tar is 2-10 wt% based on the weight of the coal tar.
10. The blockage removal and inhibition agent according to claim 1, wherein the nitrogen-containing compound comprises at least one of organic amine and a nitrogen-containing heterocyclic compound.
11. The blockage removal and inhibition agent according to claim 10, wherein the organic amine is an organic amine with a molecular weight of less than 200.
12. The blockage removal and inhibition agent according to claim 11, wherein the organic amine is at least one of substituted or unsubstituted benzylamine, benzhydrylamine, triphenylmethylamine, n-butylamine, isobutylamine, dodecylamine, n-hexylamine, cyclohexylamine, n-octylamine, and n-decylamine.
13. The deblocking and plugging inhibitor according to claim 10, wherein the nitrogen-containing heterocyclic compound is a nitrogen-containing heterocyclic compound having a molecular weight of less than 200.
14. The blockage removal and inhibition agent according to claim 13, wherein the nitrogen-containing heterocyclic compound is at least one of substituted or unsubstituted pyridine, pyrrole, pyrazine, pyridazine and pyrimidine.
15. The blockage removal and inhibition agent according to claim 14, wherein the nitrogen-containing heterocyclic compound is at least one of 2, 4-lutidine, 2-hexylpyrrole, pyrazine, pyridazine and pyrimidine.
16. Use of the blockage removal and inhibition agent according to any one of claims 1 to 15 for dissolving and/or inhibiting the formation of thick oil wellbore plugs.
17. Use according to claim 16, wherein the heavy oil wellbore plug has an asphaltene content of more than 40 wt.%, based on the weight of the heavy oil wellbore plug.
18. A method for removing blockage in thick oil recovery is characterized by comprising the following steps: contacting a blockage removal and inhibition agent with a blockage, wherein the blockage removal and inhibition agent is the blockage removal and inhibition agent according to any one of claims 1 to 15.
19. The method of claim 18, wherein contacting the deblocking inhibitor with the blockage comprises: directly mixing the blockage removing and inhibiting agent with the blockage, or
The blocking removal and inhibition agent is mixed with the thin oil, and then the thin oil containing the blocking removal and inhibition agent is mixed with the blocking object.
20. The method of claim 19 wherein the amount of asphaltenes in the plug is greater than 40 wt% based on the weight of the plug.
21. A method for inhibiting blockage in thick oil recovery is characterized by comprising the following steps: injecting a blockage removing and inhibiting agent into an oil well to contact with the thick oil, wherein the blockage removing and inhibiting agent is the blockage removing and inhibiting agent as claimed in any one of claims 1 to 15.
22. The method of claim 21, wherein contacting the deblocking and plugging inhibitor with the thickened oil comprises: directly mixing the blockage removing and inhibiting agent with the thickened oil, or,
the blocking removing and inhibiting agent is mixed with the thin oil, and then the thin oil containing the blocking removing and inhibiting agent is mixed with the thick oil.
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| CN102191028A (en) * | 2010-03-18 | 2011-09-21 | 中国石油化工股份有限公司 | Oil-soluble viscosity breaker composition |
| CN102876306A (en) * | 2011-07-14 | 2013-01-16 | 中国石油化工股份有限公司 | Asphaltene deposit dispersant |
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| CN102876306A (en) * | 2011-07-14 | 2013-01-16 | 中国石油化工股份有限公司 | Asphaltene deposit dispersant |
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