CN111205625A - Aliphatic polyketone lining pipe and preparation method thereof - Google Patents
Aliphatic polyketone lining pipe and preparation method thereof Download PDFInfo
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- CN111205625A CN111205625A CN202010309311.1A CN202010309311A CN111205625A CN 111205625 A CN111205625 A CN 111205625A CN 202010309311 A CN202010309311 A CN 202010309311A CN 111205625 A CN111205625 A CN 111205625A
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- aliphatic polyketone
- parts
- temperature
- pipe
- lining pipe
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- 125000001931 aliphatic group Chemical group 0.000 title claims abstract description 50
- 229920001470 polyketone Polymers 0.000 title claims abstract description 49
- 238000002360 preparation method Methods 0.000 title abstract description 5
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 18
- 229910052618 mica group Inorganic materials 0.000 claims abstract description 16
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 15
- 239000010445 mica Substances 0.000 claims abstract description 15
- 239000003129 oil well Substances 0.000 claims abstract description 13
- XMBWDFGMSWQBCA-UHFFFAOYSA-N hydrogen iodide Chemical compound I XMBWDFGMSWQBCA-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000002667 nucleating agent Substances 0.000 claims abstract description 11
- 150000003839 salts Chemical class 0.000 claims abstract description 11
- UAUDZVJPLUQNMU-UHFFFAOYSA-N Erucasaeureamid Natural products CCCCCCCCC=CCCCCCCCCCCCC(N)=O UAUDZVJPLUQNMU-UHFFFAOYSA-N 0.000 claims abstract description 10
- UAUDZVJPLUQNMU-KTKRTIGZSA-N erucamide Chemical compound CCCCCCCC\C=C/CCCCCCCCCCCC(N)=O UAUDZVJPLUQNMU-KTKRTIGZSA-N 0.000 claims abstract description 10
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 230000003712 anti-aging effect Effects 0.000 claims abstract description 8
- 238000010438 heat treatment Methods 0.000 claims description 12
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims description 11
- 238000004140 cleaning Methods 0.000 claims description 11
- 238000001125 extrusion Methods 0.000 claims description 9
- 229920001684 low density polyethylene Polymers 0.000 claims description 9
- 239000004702 low-density polyethylene Substances 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 9
- 239000000155 melt Substances 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 7
- -1 2, 2-bis (4-hydroxyphenyl) propane Iodide Chemical compound 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- AEFPPQGZJFTXDR-UHFFFAOYSA-M tetraphenylphosphanium;iodide Chemical group [I-].C1=CC=CC=C1[P+](C=1C=CC=CC=1)(C=1C=CC=CC=1)C1=CC=CC=C1 AEFPPQGZJFTXDR-UHFFFAOYSA-M 0.000 claims description 4
- 238000013329 compounding Methods 0.000 claims description 3
- QZUPTXGVPYNUIT-UHFFFAOYSA-N isophthalamide Chemical compound NC(=O)C1=CC=CC(C(N)=O)=C1 QZUPTXGVPYNUIT-UHFFFAOYSA-N 0.000 claims description 3
- 230000003647 oxidation Effects 0.000 claims description 3
- 238000007254 oxidation reaction Methods 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 238000006731 degradation reaction Methods 0.000 claims description 2
- 238000007599 discharging Methods 0.000 claims description 2
- 239000012535 impurity Substances 0.000 claims description 2
- PTTNOPMWYNXSSS-UHFFFAOYSA-L magnesium heptanedioate Chemical compound [Mg++].[O-]C(=O)CCCCCC([O-])=O PTTNOPMWYNXSSS-UHFFFAOYSA-L 0.000 claims description 2
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 abstract description 14
- 238000005260 corrosion Methods 0.000 abstract description 4
- 230000007797 corrosion Effects 0.000 abstract description 4
- 230000007062 hydrolysis Effects 0.000 abstract description 4
- 238000006460 hydrolysis reaction Methods 0.000 abstract description 4
- 230000000052 comparative effect Effects 0.000 description 7
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 7
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 7
- 238000012648 alternating copolymerization Methods 0.000 description 6
- QVQLCTNNEUAWMS-UHFFFAOYSA-N barium oxide Chemical compound [Ba]=O QVQLCTNNEUAWMS-UHFFFAOYSA-N 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 239000003963 antioxidant agent Substances 0.000 description 4
- 238000000605 extraction Methods 0.000 description 4
- UAYWVJHJZHQCIE-UHFFFAOYSA-L zinc iodide Chemical compound I[Zn]I UAYWVJHJZHQCIE-UHFFFAOYSA-L 0.000 description 4
- 239000004696 Poly ether ether ketone Substances 0.000 description 3
- 239000004699 Ultra-high molecular weight polyethylene Substances 0.000 description 3
- 230000003078 antioxidant effect Effects 0.000 description 3
- JUPQTSLXMOCDHR-UHFFFAOYSA-N benzene-1,4-diol;bis(4-fluorophenyl)methanone Chemical compound OC1=CC=C(O)C=C1.C1=CC(F)=CC=C1C(=O)C1=CC=C(F)C=C1 JUPQTSLXMOCDHR-UHFFFAOYSA-N 0.000 description 3
- 229920002530 polyetherether ketone Polymers 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- FVAUCKIRQBBSSJ-UHFFFAOYSA-M sodium iodide Chemical compound [Na+].[I-] FVAUCKIRQBBSSJ-UHFFFAOYSA-M 0.000 description 3
- 229920000785 ultra high molecular weight polyethylene Polymers 0.000 description 3
- 239000005977 Ethylene Substances 0.000 description 2
- 229920002292 Nylon 6 Polymers 0.000 description 2
- 239000004952 Polyamide Substances 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 239000011363 dried mixture Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229920001903 high density polyethylene Polymers 0.000 description 2
- 239000004700 high-density polyethylene Substances 0.000 description 2
- 239000012299 nitrogen atmosphere Substances 0.000 description 2
- 229920002647 polyamide Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 239000002516 radical scavenger Substances 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 238000004513 sizing Methods 0.000 description 2
- IATRAKWUXMZMIY-UHFFFAOYSA-N strontium oxide Chemical compound [O-2].[Sr+2] IATRAKWUXMZMIY-UHFFFAOYSA-N 0.000 description 2
- MBSRTKPGZKQXQR-UHFFFAOYSA-N 2-n,6-n-dicyclohexylnaphthalene-2,6-dicarboxamide Chemical compound C=1C=C2C=C(C(=O)NC3CCCCC3)C=CC2=CC=1C(=O)NC1CCCCC1 MBSRTKPGZKQXQR-UHFFFAOYSA-N 0.000 description 1
- GCVCAOXNTUEQSG-UHFFFAOYSA-N 3-(cyclohexylcarbamoyl)benzoic acid Chemical compound OC(=O)C1=CC=CC(C(=O)NC2CCCCC2)=C1 GCVCAOXNTUEQSG-UHFFFAOYSA-N 0.000 description 1
- UNMYWSMUMWPJLR-UHFFFAOYSA-L Calcium iodide Chemical compound [Ca+2].[I-].[I-] UNMYWSMUMWPJLR-UHFFFAOYSA-L 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 229920002302 Nylon 6,6 Polymers 0.000 description 1
- 239000002202 Polyethylene glycol Substances 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- HMOQPOVBDRFNIU-UHFFFAOYSA-N barium(2+);dioxido(oxo)silane Chemical compound [Ba+2].[O-][Si]([O-])=O HMOQPOVBDRFNIU-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229940046413 calcium iodide Drugs 0.000 description 1
- 229910001640 calcium iodide Inorganic materials 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000004595 color masterbatch Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- PNZXMIKHJXIPEK-UHFFFAOYSA-N cyclohexanecarboxamide Chemical compound NC(=O)C1CCCCC1 PNZXMIKHJXIPEK-UHFFFAOYSA-N 0.000 description 1
- YGANSGVIUGARFR-UHFFFAOYSA-N dipotassium dioxosilane oxo(oxoalumanyloxy)alumane oxygen(2-) Chemical compound [O--].[K+].[K+].O=[Si]=O.O=[Al]O[Al]=O YGANSGVIUGARFR-UHFFFAOYSA-N 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 239000007863 gel particle Substances 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 229910052627 muscovite Inorganic materials 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 229910052628 phlogopite Inorganic materials 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 235000009518 sodium iodide Nutrition 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- KKEYFWRCBNTPAC-UHFFFAOYSA-L terephthalate(2-) Chemical compound [O-]C(=O)C1=CC=C(C([O-])=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-L 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 239000010913 used oil Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K13/00—Use of mixtures of ingredients not covered by one single of the preceding main groups, each of these compounds being essential
- C08K13/02—Organic and inorganic ingredients
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/16—Halogen-containing compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/13—Phenols; Phenolates
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L9/00—Rigid pipes
- F16L9/14—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups
- F16L9/147—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups comprising only layers of metal and plastics with or without reinforcement
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2206—Oxides; Hydroxides of metals of calcium, strontium or barium
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/18—Applications used for pipes
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/24—Crystallisation aids
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a lining pipe prepared from aliphatic polyketone. The lining pipe is prepared from the following components: 80-100 parts of aliphatic polyketone, 1-12 parts of 2, 2-bis (4-hydroxyphenyl) propane, 3-9 parts of iodide onium salt, 10-30 parts of mica, 0.02-0.05 part of nucleating agent, 2-14 parts of erucamide, 4-16 parts of calcium carbonate, 2-13 parts of anti-aging agent and 0.7-1 part of water trapping agent. The Vicat softening temperature of the lining pipe reaches more than 200 ℃, the lining pipe shows excellent wear resistance, corrosion resistance, impact resistance, heat resistance, hydrolysis resistance and scaling resistance at the well temperature of more than 130 ℃, and the lining pipe can be applied to high-temperature oil wells in a large scale. The invention also discloses a preparation method of the lining pipe and a high-temperature-resistant oil pipe produced by using the lining pipe.
Description
Technical Field
The invention relates to the technical field of oil field petroleum machinery, in particular to an aliphatic polyketone lining pipe for compounding with a steel oil pipe and a preparation method thereof.
Background
In recent years, with the increasing oil extraction depth of main oil fields in China, the well temperature can reach 130 ℃ in a deep well of 2000m-3000 m. The existing widely used oil production lining pipe is mainly made of HDPE, XPE, PEX, PERT, PA6, PA66, PEEK or UHMWPE material. Because the HDPE, XPE, PEX and PERT have lower use temperature, the high-temperature-resistant polyethylene glycol terephthalate (PERT) is only suitable for oil wells with the well temperature lower than 80 ℃. PA materials have excellent high temperature resistance and chemical stability, but are brittle, have poor bending properties, are prone to cracking, have high water absorption, and have a short service life. The UHMWPE liner tube can adapt to the oil well temperature of 90 ℃ and meet the requirement of a common oil well, but the heat resistance of the UHMWPE liner tube is still difficult to meet the requirement for a deep well with the well temperature of more than 90 ℃. Although the PEEK material has excellent comprehensive performance, the PEEK material is expensive and is not suitable for being widely used for lining pipes.
When the polyethylene liner tube and the polyamide liner tube which are commonly used at present are used for deep well oil extraction, the service performance is rapidly aged and reduced under the high temperature condition of more than 110 ℃, fragments are generated, and an oil well pump is blocked.
Therefore, at present, a high-temperature resistant oil extraction lining pipe which meets the use requirements of deep well oil pipes and can be used in a large range is urgently needed.
Disclosure of Invention
In view of the above problems of the prior art, the present invention provides a lining pipe made of aliphatic polyketone. The Vicat softening temperature of the oil well reaches more than 200 ℃, and the oil well has excellent wear resistance, corrosion resistance, impact resistance, heat resistance, hydrolysis resistance and scaling resistance at the well temperature of more than 130 ℃, and can be applied to high-temperature oil wells in a large scale. The invention also provides a preparation method of the lining pipe and a high-temperature-resistant oil pipe produced by using the lining pipe.
The aliphatic polyketone lining pipe is prepared from the following components:
aliphatic polyketone 100 parts by weight
1-12 parts by weight of 2, 2-bis (4-hydroxyphenyl) propane
Iodide onium salt 3-9 weight portions
10-30 parts of mica
0.02-0.05 part by weight of nucleating agent
Erucamide 2-14 weight parts
Calcium carbonate 4-16 weight portions
2-13 parts of anti-aging agent
0.7-1 part of water trapping agent.
The aliphatic polyketone is linear alternating copolymerization aliphatic polyketone with the number average molecular weight of 70,000-110,000, and is a product prepared by adopting carbon monoxide, ethylene and propylene in the presence of a catalyst according to the following reaction equation:
wherein, the propylene consumption is preferably 20-40 mol% of the total amount of the raw materials.
The aliphatic polyketone inner liner tube of the present invention can be produced by the following method:
(1) adding aliphatic polyketone, 2-bis (4-hydroxyphenyl) propane, iodide onium salt, mica, a nucleating agent, erucamide, calcium carbonate and an anti-aging agent into a stirrer according to the above-mentioned dosage, and uniformly stirring;
(2) drying the mixture obtained in the step (1) at 80-95 ℃ for at least 6 hours to obtain a dried product;
(3) cleaning the extruder by adopting a two-step heating method, and then adding the product obtained in the step (2) and a water trapping agent into the extruder;
(4) starting the extruder, and carrying out extrusion molding.
The invention also provides an oil pipe for an oil well with the well temperature of more than 130 ℃, which is prepared by compounding a base pipe and the aliphatic polyketone lining pipe.
Preferably, the base pipe is a steel base pipe.
By adopting the technical scheme provided by the invention, the following beneficial effects can be realized:
(1) the liner pipe of linear alternating copolymerization aliphatic polyketone of the invention uses low molecular weight aliphatic polyketone, 2-bis (4-hydroxyphenyl) propane and iodide onium salt in combination, compared with the liner pipe using high molecular weight aliphatic polyketone, the liner pipe improves the processability, obtains equivalent and even better high temperature resistance, corrosion resistance, impact resistance and hydrolysis resistance, realizes the heat distortion temperature of more than 200 ℃, can be used in high temperature oil wells for more than 2 years, and better meets the requirements of deep well oil extraction process of more than 3000 m.
(2) The linear alternating copolymerization aliphatic polyketone lining pipe of the invention improves the processability and further improves the wear resistance and impact resistance of the lining pipe in a high-temperature environment by using the low-molecular-weight aliphatic polyketone, the mica and the nucleating agent in combination.
(3) According to the manufacturing process of the linear alternating copolymerization aliphatic polyketone lining pipe, the moisture capture agent is added, so that the phenomenon that a small amount of moisture remained after drying of all components emits water vapor during extrusion molding to generate bubbles in the pipe is fully avoided, and the mechanical strength of the lining pipe is effectively improved.
(4) The linear alternating copolymerization aliphatic polyketone lining pipe can ideally replace polyethylene and polyamide pipes in the prior art, and greatly prolongs the service life and the repair-free period of an oil pipe in a high-temperature oil well on the basis of not changing the original operation process.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention are described in further detail below.
As the aliphatic polyketone used in the present invention, a linear alternating copolymerized aliphatic polyketone having a number average molecular weight of 70,000-110,000, preferably a number average molecular weight of 80,000-95,000 can be used. If the aliphatic polyketone has a number average molecular weight of less than 70,000, the resulting inner liner tube may have insufficient high temperature resistance and mechanical strength; if the number average molecular weight is more than 110,000, the melt viscosity of the inner liner pipe becomes too high, and the effect becomes unsatisfactory when processed by conventional equipment, and the processing requires special equipment, resulting in high cost.
The linear alternating copolymerization aliphatic polyketone can be prepared by copolymerizing CO, ethylene and propylene in the presence of a catalyst by a method known in the art. Wherein propylene is used in an amount of 20 to 40 mol%, more preferably 25 to 30 mol%, based on the total amount of comonomers. The linear alternating copolymeric aliphatic polyketones are also commercially available, and as an example, a commercially available product from Hyosung corporation can be typically used.
As the iodide onium salt used in the present invention, tetraphenylphosphonium iodide is typically used. By using an iodide onium salt instead of the conventionally used iodide such as sodium iodide, zinc iodide and calcium iodide and combining it with 2, 2-bis (4-hydroxyphenyl) propane, the oxidation resistance at high temperature of the aliphatic polyketone having a relatively low number average molecular weight employed in the present invention can be effectively improved, thereby improving the high temperature resistance of the inner liner pipe, as well as the corrosion resistance, hydrolysis resistance and impact resistance under a high temperature environment.
As mica used in the present invention, flat six-sided monoclinic high aspect ratio mica can be typically used. Phlogopite is preferably used, but other natural or synthetic micas such as muscovite, fluorophlogopite and barium disilicate may also be used. The mica particle size is typically 50-500 mesh, preferably 200-350 mesh.
As the nucleating agent of the present invention, one or more of 2, 6-benzenedicarboxylic acid cyclohexanamide, N' -dicyclohexyl-2, 6-naphthalenediamide, and magnesium pimelate can be typically used.
According to the invention, mica and a nucleating agent are added into the low-molecular-weight aliphatic polyketone in a combined manner, so that the heat deformation temperature and the mechanical strength of the lining pipe can be effectively improved.
Erucamide, as used herein, primarily functions as a detackifier in the present invention. The amount is in the range of 2 to 14 parts by weight, preferably 5 to 10 parts by weight, relative to 100 parts by weight of the aliphatic polyketone. If the using amount is less than 2 parts by weight, the prepared lining pipe has insufficient paraffin resistance; if it is used in an amount greater than 14 parts by weight, the mechanical strength of the inner liner may be adversely affected.
The antioxidant used in the present invention is not particularly limited, and various antioxidants widely used in the art can be used. Typically, the antioxidant RD and the antioxidant D are exemplified.
As the moisture scavenger used in the present invention, an inorganic metal oxide-based moisture scavenger can be used. Preferably, calcium oxide, barium oxide, strontium oxide, and the like can be used. The amount is typically 0.7 to 1 part by weight, preferably 0.8 to 0.9 part by weight, relative to 100 parts by weight of the aliphatic polyketone. If the amount is less than 0.7 parts by weight, there is a possibility that residual water vapor is not sufficiently absorbed, bubbles are formed in the lining pipe, and the mechanical strength of the lining pipe is impaired.
The present invention also provides a method for producing the aliphatic polyketone inner liner tube, which can be typically produced by:
(1) adding aliphatic polyketone, 2-bis (4-hydroxyphenyl) propane, iodide onium salt, mica, a nucleating agent, erucamide, calcium carbonate and an anti-aging agent into a stirrer according to the above-mentioned dosage, and uniformly stirring;
(2) drying the mixture obtained in the step (1) at 80-95 ℃ for at least 6 hours to obtain a dried product;
(3) cleaning the extruder by adopting a two-step heating method, and then adding the product obtained in the step (2) and a water trapping agent into the extruder;
(4) starting the extruder, and carrying out extrusion molding.
Wherein, optionally, color master batch can be further added in the step (1) for color matching.
As the step (3), it may be performed in the following manner:
①, heating to 150 ℃, and avoiding oxidation/degradation reaction of residual impurities in the extruder;
② raising the temperature to 200-220 ℃ processing temperature, and keeping the temperature for 1-2 h;
③, cleaning the extruder by using LDPE with the melt index of 2-5, discharging the LDPE after cleaning, and directly pouring the product obtained in the step (2) and the moisture catcher.
And (3) as the extrusion process of the step (4), a single-screw extruder is adopted for implementation, the temperature of a machine head is 220-225 ℃, the pressure is 8-10 MPa, and the temperature of each heating area of a machine barrel is as follows: a first area: 200-215 ℃, and a second zone: 215-220 ℃, and three zones: 220-230 ℃, four zones: 225-235 ℃.
Optionally, in the extrusion process of step (4), the melt temperature may be tested after extrusion stabilization, e.g., a temperature above 230 ℃, and the processing temperature may be gradually reduced, provided that processing stability is ensured.
Further, since the extrusion of the aliphatic polyketone composition is high in the requirements for equipment and condition control, if the following problems arise, a mid-stream purge treatment may be carried out, if necessary:
① produce a large number of gel particles or black dots;
② the product turns yellow;
③ sudden drop in extrusion;
④ melt pressure and screw torque suddenly increased.
Thus, optionally, the lining tube manufacturing method may further comprise a step of cleaning the lining tube halfway.
The midway clearing step comprises the following steps:
①, cleaning the dried mixture obtained in the step (2) from a feeding bin of an extruder, and pouring LDPE with the melt index of 2-5;
②, keeping the processing temperature unchanged, and cleaning the machine until the mixture is completely cleaned;
③, cleaning the LDPE, adding the dried mixture obtained in the step (2) again, and restarting the extruder for production.
The invention also provides a composite oil pipe for an oil well with the well temperature of above 130 ℃, which is typically drawn into the base pipe through the lining pipe, so that the lining pipe and the base pipe are in interference fit. Then heating at 90-110 deg.C for 1.5-3 hr. Then heating, softening and flanging the two ends of the lining pipe.
As the base pipe, typically a steel pipe may be used.
The present invention is further illustrated by the following specific examples, but it should be understood that the following examples are only exemplary embodiments and are not intended to limit the scope of the present invention in any way.
Example 1
100kg of a linear alternating copolymerized aliphatic polyketone (M)n=80,000, the propylene content in the structural unit accounts for 30 mol%, manufactured by Hyonsung), 8kg of 2, 2-bis (4-hydroxyphenyl) propane, 5kg of tetraphenylphosphonium iodide, 18kg of mica, 0.04kg of 2, 6-benzenedicarboxylic acid cyclohexylamide, 7kg of erucamide, 10kg of calcium carbonate and 3kg of anti-aging agent RD are added into a stirrer and stirred uniformly; the resulting mixture was dried at 90 ℃ for 6 hours to obtain a dried product. The single screw extruder was started, warmed to 150 ℃ for 1 hour, then to 220 ℃ for 1.5 hours, and then purged with LDPE having a melt index of 3 and discharged. The four heating zones are set at 200 deg.C, 220 deg.C, 225 deg.C and 235 deg.C, respectively, and the head temperature is set at 225 deg.C. Then, the dried product obtained above and 0.8kg of barium oxide were fed into an extruder under a nitrogen atmosphere, and extruded at a rotation speed of 40 rpm under a pressure of 10MPa to obtain a lined pipe blank. The obtained tube blank is shaped by a vacuum sizing sleeve and a shaping chamber to obtain the lining tube 1
Example 2
100kg of a linear alternating copolymerized aliphatic polyketone (M)n=80,000, the propylene content in the structural unit accounts for 30 mol%, manufactured by Hyonsung), 2kg of 2, 2-bis (4-hydroxyphenyl) propane, 9kg of tetraphenylphosphonium iodide, 12kg of mica, 0.05kg of 2, 6-benzenedicarboxamide, 2kg of erucamide, 5kg of calcium carbonate and 10kg of anti-aging agent RD are added into a stirrer and stirred uniformly; the resulting mixture was dried at 90 ℃ for 6 hours to obtain a dried product. The single screw extruder was started, warmed to 150 ℃ for 1 hour, then to 220 ℃ for 1.5 hours, and then purged with LDPE having a melt index of 3 and discharged. The four heating zones are set at 200 deg.C, 220 deg.C, 225 deg.C and 235 deg.C, respectively, and the head temperature is set at 225 deg.C. Then, the dried product obtained above and 0.9kg of barium oxide were fed into an extruder under a nitrogen atmosphere, and extruded at a rotation speed of 40 rpm under a pressure of 10MPa to obtain a lined pipe blank. The obtained tube blank is shaped by a vacuum sizing sleeve and a shaping chamber to obtain an inner lining tube 2
Example 3
An inner liner was produced in the same manner as in example 1 except that 26kg of mica was used and 0.02kg of N, N' -dicyclohexyl-2, 6-naphthalenediamide was used instead of 2, 6-cyclohexanecarboxamide, to obtain an inner liner 3.
Example 4
An inner liner tube was produced in the same manner as in example 1 except that 100kg of linear alternating copolymerized aliphatic polyketone (Mn =100,000, propylene content of 27 mol%, manufactured by Hyonsung) was used, to obtain an inner liner tube 4.
Example 5
An inner liner pipe was produced in the same manner as in example 1 except that 10kg of erucamide and 13kg of calcium carbonate were used, to obtain an inner liner pipe 5.
Comparative example 1
An inner liner tube was produced in the same manner as in example 1, except that 2, 6-benzenedicarboxamide was not used, to obtain an inner liner tube C1.
Comparative example 2
A lined pipe was produced in the same manner as in example 1, except that zinc iodide was used instead of 2, 2-bis (4-hydroxyphenyl) propane, to obtain a lined pipe C2.
Comparative example 3
An inner liner tube was produced in the same manner as in example 1, except that PA6 was used instead of the aliphatic polyketone, and after obtaining a dried product, the dried product was directly fed into a single-screw extruder without heating at 150 ℃ and 220 ℃ and washing with LDPE to extrude, to obtain an inner liner tube C3.
The properties of the inner liner pipes obtained in examples 1 to 5 and comparative examples 1 to 3 are shown in the following table 1:
table 1: performance of lining pipe
| Test items | Test method | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | Comparative example 1 | Comparative example 2 | Comparative example 3 |
| Density, g/cm3 | GB/T1033.1 | 1.24 | 1.24 | 1.27 | 1.25 | 1.28 | 1.24 | 1.24 | 1.31 |
| Vicat softening temperature (A50),. degree C | GB/T 1633 | 213 | 212 | 205 | 217 | 216 | 190 | 177 | 209 |
| Heat distortion temperature (0.45 MPa) and DEG C | GB/T 1634.2 | ≥180 | ≥180 | ≥180 | ≥180 | ≥180 | 164 | 153 | ≥180 |
| Shore hardness, HD | GB/T 2411 | 85 | 81 | 89 | 87 | 90 | 68 | 65 | 73 |
| Tensile elongation at break, 120 ℃% | GB/T 8804.3 | 463 | 469 | 462 | 471 | 461 | 394 | 380 | 401 |
| Tensile breaking yield strength, MPa | GB/T 8804.3 | 92 | 99 | 89 | 96 | 91 | 75 | 71 | 82 |
| Mortar wear amount% | Q/SH1020 1889-2011 | 2.5 | 2.3 | 2.5 | 2.3 | 2.4 | 4.6 | 5.3 | 5.9 |
From the experimental data of Table 1, it can be found that, although the present invention obtains a remarkable improvement in high temperature resistance, abrasion resistance, hardness and impact resistance while reducing the difficulty of processing the material by using the stated amounts of 2, 2-bis (4-hydroxyphenyl) propane and iodide onium salt in combination with mica and a nucleating agent, by selecting a relatively low molecular weight alternating copolymerized aliphatic polyketone as a base.
The foregoing is merely an example of the present invention and common general knowledge of known specific structures and features of the embodiments is not described herein in any greater detail. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several changes and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (10)
1. The aliphatic polyketone lining pipe is characterized by being prepared from the following components:
aliphatic polyketone 100 parts by weight
1-12 parts by weight of 2, 2-bis (4-hydroxyphenyl) propane
Iodide onium salt 3-9 weight portions
10-30 parts of mica
0.02-0.05 part by weight of nucleating agent
Erucamide 2-14 weight parts
Calcium carbonate 4-16 weight portions
2-13 parts of anti-aging agent
0.7-1 part of water trapping agent.
2. The aliphatic polyketone liner tube of claim 1, wherein said aliphatic polyketone is a linear alternating copolymerized aliphatic polyketone.
3. The aliphatic polyketone inner liner tube of claim 1, wherein the iodide onium salt is tetraphenylphosphonium iodide.
4. The aliphatic polyketone inner liner tube according to claim 1, wherein the nucleating agent is selected from one or more of 2, 6-benzenedicarboxamide, N' -dicyclohexyl-2, 6-naphthalenediamide, magnesium heptanedioate.
5. A method of making the aliphatic polyketone lined pipe of claim 1, comprising the steps of:
(1) adding aliphatic polyketone, 2-bis (4-hydroxyphenyl) propane, iodide onium salt, mica, a nucleating agent, erucamide, calcium carbonate and an anti-aging agent into a stirrer, and uniformly stirring;
(2) drying the mixture obtained in the step (1) at 80-95 ℃ for at least 6 hours to obtain a dried product;
(3) cleaning the extruder by adopting a two-step heating method, and then adding the product obtained in the step (2) and a water trapping agent into the extruder;
(4) starting the extruder, and carrying out extrusion molding.
6. The method of manufacturing an aliphatic polyketone liner tube as in claim 5, wherein said step (3) is carried out by:
①, heating to 150 ℃, and avoiding oxidation/degradation reaction of residual impurities in the extruder;
② raising the temperature to 200-220 ℃ processing temperature, and keeping the temperature for 1-2 h;
③, cleaning the extruder by using LDPE with the melt index of 2-5, discharging the LDPE after cleaning, and directly pouring the product obtained in the step (2) and the moisture catcher.
7. The method of manufacturing an aliphatic polyketone liner tube as in claim 5, wherein the extruding of step (4) is performed using a single screw extruder.
8. The method for manufacturing the aliphatic polyketone inner liner tube according to claim 7, wherein the head temperature of the single screw extruder is 220-225 ℃, the pressure is 8-10 MPa, and the temperature of each heating zone of the machine barrel is as follows: a first area: 200-215 ℃, and a second zone: 215-220 ℃, and three zones: 220-230 ℃, four zones: 225-235 ℃.
9. An oil pipe for an oil well having a well temperature of 130 ℃ or higher, which is produced by compounding a base pipe with the aliphatic polyketone-lined pipe according to any one of claims 1 to 4.
10. Oil pipe according to claim 9, characterized in that the base pipe is a steel pipe.
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Denomination of invention: An aliphatic polyketone inner lining tube and its preparation method Effective date of registration: 20231213 Granted publication date: 20200814 Pledgee: Huanghe Road Sub branch of Dongying Laishang Rural Bank Co.,Ltd. Pledgor: SHENGLI OILFIELD DONGRUN MACHINERY ENGINEERING Co.,Ltd. Registration number: Y2023980070894 |
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