CN110483866B - High-temperature and high-pressure resistant packer - Google Patents
High-temperature and high-pressure resistant packer Download PDFInfo
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- CN110483866B CN110483866B CN201910931926.5A CN201910931926A CN110483866B CN 110483866 B CN110483866 B CN 110483866B CN 201910931926 A CN201910931926 A CN 201910931926A CN 110483866 B CN110483866 B CN 110483866B
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- 229920001971 elastomer Polymers 0.000 claims abstract description 94
- 239000000463 material Substances 0.000 claims abstract description 42
- 239000006229 carbon black Substances 0.000 claims abstract description 40
- 239000002994 raw material Substances 0.000 claims abstract description 31
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 28
- 239000004014 plasticizer Substances 0.000 claims abstract description 26
- 229920000459 Nitrile rubber Polymers 0.000 claims abstract description 21
- 238000004132 cross linking Methods 0.000 claims abstract description 17
- 230000003712 anti-aging effect Effects 0.000 claims abstract description 16
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000004227 thermal cracking Methods 0.000 claims abstract description 12
- 239000004927 clay Substances 0.000 claims abstract description 8
- 239000007921 spray Substances 0.000 claims abstract description 7
- 238000002156 mixing Methods 0.000 claims description 44
- 238000004073 vulcanization Methods 0.000 claims description 40
- 239000004594 Masterbatch (MB) Substances 0.000 claims description 19
- 238000007599 discharging Methods 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 13
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 claims description 12
- 238000002360 preparation method Methods 0.000 claims description 11
- 238000007789 sealing Methods 0.000 claims description 8
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 claims description 6
- 239000003292 glue Substances 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 5
- 238000005507 spraying Methods 0.000 claims description 5
- 239000004808 2-ethylhexylester Substances 0.000 claims description 4
- KRADHMIOFJQKEZ-UHFFFAOYSA-N Tri-2-ethylhexyl trimellitate Chemical compound CCCCC(CC)COC(=O)C1=CC=C(C(=O)OCC(CC)CCCC)C(C(=O)OCC(CC)CCCC)=C1 KRADHMIOFJQKEZ-UHFFFAOYSA-N 0.000 claims description 4
- 238000004873 anchoring Methods 0.000 claims description 3
- IPJGAEWUPXWFPL-UHFFFAOYSA-N 1-[3-(2,5-dioxopyrrol-1-yl)phenyl]pyrrole-2,5-dione Chemical compound O=C1C=CC(=O)N1C1=CC=CC(N2C(C=CC2=O)=O)=C1 IPJGAEWUPXWFPL-UHFFFAOYSA-N 0.000 claims description 2
- 230000009286 beneficial effect Effects 0.000 abstract description 5
- 239000003963 antioxidant agent Substances 0.000 description 13
- 230000003078 antioxidant effect Effects 0.000 description 13
- 238000012360 testing method Methods 0.000 description 9
- 239000007789 gas Substances 0.000 description 7
- 238000012856 packing Methods 0.000 description 5
- 239000000306 component Substances 0.000 description 4
- 238000013329 compounding Methods 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000032683 aging Effects 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 230000035882 stress Effects 0.000 description 3
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 2
- 238000010009 beating Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000000748 compression moulding Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 150000002978 peroxides Chemical class 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 239000012779 reinforcing material Substances 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 229920006168 hydrated nitrile rubber Polymers 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000011164 primary particle Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000012744 reinforcing agent Substances 0.000 description 1
- 238000010074 rubber mixing Methods 0.000 description 1
- 238000013040 rubber vulcanization Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000010059 sulfur vulcanization Methods 0.000 description 1
- 238000003878 thermal aging Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/002—Methods
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
-
- 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
- C08K3/02—Elements
- C08K3/04—Carbon
-
- 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
- C08K3/346—Clay
-
- 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
- C08K3/36—Silica
-
- 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
- C08K5/14—Peroxides
-
- 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
- C08K5/16—Nitrogen-containing compounds
- C08K5/34—Heterocyclic compounds having nitrogen in the ring
- C08K5/3412—Heterocyclic compounds having nitrogen in the ring having one nitrogen atom in the ring
- C08K5/3415—Five-membered rings
-
- 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
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
-
- 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
- C08K2201/00—Specific properties of additives
- C08K2201/014—Additives containing two or more different additives of the same subgroup in C08K
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/141—Feedstock
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- Health & Medical Sciences (AREA)
- Polymers & Plastics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Oral & Maxillofacial Surgery (AREA)
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Abstract
The invention provides a high-temperature and high-pressure resistant packer. The packer comprises a packer rubber cylinder, wherein the rubber material of the packer rubber cylinder is prepared from the following raw materials in parts by mass: 36-50% of hydrogenated nitrile rubber, 12-33% of spray carbon black, 1-14% of thermal cracking carbon black, 3-14% of nano white carbon black, 3-19% of pottery clay, 1-9% of plasticizer, 0.5-2% of anti-aging agent, 0.5-2% of vulcanizing agent and 1-4% of crosslinking accelerator. The beneficial effects of the invention include: the packer of the rubber cylinder prepared by the rubber material can adapt to severe working environment with high temperature of 180 ℃ and pressure difference of 105 MPa.
Description
Technical Field
The invention relates to the field of oil testing, in particular to a high-temperature and high-pressure resistant packer.
Background
The reserves of natural gas in deep and ultra-deep layers of China respectively account for 31.23% and 15.93% of the total natural gas resources. In the conventional shallow oil and gas development and exhaustion period, in order to meet the requirements on oil and gas, the deep oil and gas reservoir is inevitably entered, and a large number of high-quality oil and gas reservoirs of structural zones such as a double-fish stone, a jiulong mountain, a Mirabi high-rise ladder, a garage mountain and the like are discovered successively. However, one typical characteristic of these reservoirs is high temperature and high pressure, even ultra high temperature and high pressure, which presents a serious challenge to test well completion operations.
The packer is one of key tools for oil testing and well completion operation, and plays the roles of packing and isolating the oil sleeve annulus and guaranteeing the safety of a shaft. The rubber sleeve is a core component of the packer and is a direct executor of sealing action, and the high-temperature resistance and strength of the rubber sleeve in the well determine the success or failure of the oil testing and well completion operation. At present, the technical level of the rubber cylinder in China mainly stays at 150 ℃ high temperature resistance and 70MPa pressure resistance, and cannot meet the working environment of higher temperature and high pressure.
Disclosure of Invention
In view of the deficiencies in the prior art, it is an object of the present invention to address one or more of the problems in the prior art as set forth above. For example, one of the objectives of the present invention is to provide a packer capable of withstanding high temperature and high pressure so as to satisfy the working conditions of high temperature and high pressure.
In order to achieve the purpose, the invention provides a packer capable of resisting high temperature and high pressure.
The packer can comprise a packer rubber sleeve, and the rubber material of the packer rubber sleeve can be prepared from the following raw materials in parts by mass:
36-50% of hydrogenated nitrile rubber, 12-33% of spray carbon black, 1-14% of thermal cracking carbon black, 3-14% of nano white carbon black, 3-19% of pottery clay, 1-9% of plasticizer, 0.5-2% of anti-aging agent, 0.5-2% of vulcanizing agent and 1-4% of crosslinking accelerator.
In an exemplary embodiment of the present invention, the hydrogenated nitrile rubber may have an acrylonitrile mass fraction of 36 to 44% and a residual double bond content of less than 8%, and may have a raw rubber Mooney viscosity ML1+4(100 ℃) of 50 to 100.
In an exemplary embodiment of the present invention, the thermal cracking carbon black may have a specific surface area of 7 to 12m2/g。
In one exemplary embodiment of the present invention, the plasticizer may include at least one of a DOS plasticizer, a DOP plasticizer, a TP-95 plasticizer, and a TOTM plasticizer.
In an exemplary embodiment of the invention, the antioxidant may comprise at least one of RD antioxidant, 445 antioxidant, ZMTI antioxidant, and MB antioxidant.
In an exemplary embodiment of the present invention, the crosslinking accelerator may include N, N' -m-phenylene bismaleimide.
In an exemplary embodiment of the present invention, the sulfurizing agent may include di-t-butylperoxyisopropyl benzene, and the effective content of the di-t-butylperoxyisopropyl benzene may be not less than 40%.
In an exemplary embodiment of the present invention, the method for preparing the rubber material may include the steps of:
putting hydrogenated nitrile rubber, thermal cracking carbon black, spraying carbon black, nano white carbon black, pottery clay, a plasticizer and an anti-aging agent in the preparation raw materials into mixing equipment for first mixing, and discharging rubber for the first time to obtain master batch;
And (3) putting the master batch, the vulcanizing agent and the crosslinking accelerator in the preparation raw materials into mixing equipment for mixing for the second time, and discharging the rubber for the second time to obtain the high-temperature and high-pressure resistant rubber material.
In one exemplary embodiment of the present invention, the method for preparing the rubber material may include the steps of:
putting hydrogenated nitrile rubber, thermal cracking carbon black, spraying carbon black, nano white carbon black, pottery clay, a plasticizer and an anti-aging agent in the preparation raw materials into mixing equipment for first mixing, and discharging rubber for the first time to obtain master batch;
putting the master batch, the vulcanizing agent and the crosslinking accelerator in the preparation raw materials into mixing equipment for mixing for the second time, and discharging rubber for the second time to obtain a rubber material to be vulcanized;
drying the rubber material to be vulcanized;
carrying out first vulcanization on the dried material to obtain a first vulcanization product;
and carrying out secondary vulcanization on the first vulcanized product to obtain the high-temperature and high-pressure resistant rubber material.
In an exemplary embodiment of the present invention, before the performing of the second mixing, the method may further include the steps of: and (3) placing the masterbatch for more than 8h at room temperature.
In an exemplary embodiment of the invention, the rotation speed of the rotor of the first mixing equipment can be 70-80 rpm, the temperature of the first rubber output can be 90-100 ℃, and the time can be 10-15 min.
In an exemplary embodiment of the invention, the rotation speed of the rotor of the second mixing equipment can be 50-70 rpm, the temperature of the second glue discharging can be 100-120 ℃, and the time can be 3-5 min.
In an exemplary embodiment of the present invention, before the first vulcanization, the method may further include the steps of: and (3) placing the rubber material to be vulcanized at room temperature for more than 8 hours.
In an exemplary embodiment of the present invention, the temperature condition of the first vulcanization may be 145 to 155 ℃ and the time may be 42 to 48 min.
In an exemplary embodiment of the invention, the temperature condition of the second vulcanization can be 145-155 ℃ and the time can be 3-5 h.
Compared with the prior art, the beneficial effects of the invention can include: the rubber sleeve prepared by the rubber material can resist high temperature of 180 ℃ and pressure difference of 105MPa, so that the packer adopting the rubber sleeve can meet the technical requirements of deep well and ultra-deep well exploitation on the packer.
Detailed Description
Hereinafter, the high temperature and high pressure resistant packer of the present invention will be described in detail with reference to exemplary embodiments, and the first and second appearing in the present invention do not indicate a sequential order but are used only for distinguishing each other.
The invention provides a high-temperature and high-pressure resistant packer.
In an exemplary embodiment of the invention, the packer may comprise a sealing portion, an anchoring portion, a centralizer portion, a setting portion, a locking portion, and a deblocking portion, wherein,
the sealing section may include a packer packing element, a steel bowl upon which the packer packing element is mounted, a spacer ring (retainer ring), and various "anti-extrusion" features that prevent "shoulder extrusion" of the sealing element.
The anchoring portion may include a hydraulic anchor and slips.
The centralizer may include a centralizing spring and a centralizer, and the centralizer may include a centralizing spring cage, a spring seat, and a spring.
The setting part can comprise a setting piston, a central pipe, an upper joint, a lower joint and a sliding ring sleeve.
The locking portion may include a central tube, a pin, and an internal locking mechanism.
The deblocking portion may include a balance piston, a balance valve, a circulation bore liner, and a deblocking pin.
The rubber material for manufacturing the packer rubber cylinder can be prepared from the following raw materials in parts by mass:
36-50% of hydrogenated nitrile rubber, 12-33% of spray carbon black, 1-14% of thermal cracking carbon black, 3-14% of nano white carbon black, 3-19% of pottery clay, 1-9% of plasticizer, 0.5-2% of anti-aging agent, 0.5-2% of vulcanizing agent and 1-4% of crosslinking accelerator.
In the embodiment, the hydrogenated nitrile rubber can be selected from Arrheniaceae HNBR3607, HNBR3907, HNBR4307 and HNBR4367, the hydrogenated nitrile rubber HNBR has excellent oil resistance and solvent resistance and keeps better high and low temperature resistance balance, the mass fraction of acrylonitrile in the hydrogenated nitrile rubber can be 36-44%, the content of residual double bonds is less than 8%, and the crude rubber Mooney viscosity ML1+4(100 ℃) of the hydrogenated nitrile rubber can be 50-100.
When the mass fraction of acrylonitrile in the selected hydrogenated nitrile rubber is 36-44%, the prepared rubber material can have heat resistance, oil resistance and hydrogen sulfide resistance and has good compression set characteristics. The rubber sleeve of the test packer is required to have good recovery after the test is finished, the higher the acrylonitrile content is, the poorer the recovery of the rubber sleeve is, and in order that the rubber sleeve of the test packer prepared from the rubber material has good recovery after the test is finished, the mass fraction of acrylonitrile is not suitable to be high.
When the content of residual double bonds in the selected hydrogenated nitrile rubber is less than 8%, more cross-linked bonds can be generated during vulcanization, the three-dimensional network structure of the rubber can be improved, and the rubber can resist higher pressure in an oil gas well.
When the Mooney viscosity of the raw rubber of the selected hydrogenated nitrile rubber is within the range of 50-100, the rubber material can be ensured to have good processability in the rubber mixing and vulcanizing process.
In this embodiment, the spray carbon black, the thermal cracking carbon black and the nano white carbon black are used as the combined reinforcing material, and the combined reinforcing material is used for improving the mechanical strength of the rubber and simultaneously playing respective unique advantages to resist severe environments such as underground high-temperature aging, dynamic load body failure, high extrusion tearing and the like. Wherein, the spraying of the carbon black can also improve the later-period aging resistance of the rubber; the thermal carbon black has the largest particle size (average diameter of 240-320 nm) but the lowest specific surface area of 7-12 m2The thermal cracking carbon black can reduce the compression permanent deformation of rubber and improve the dynamic sealing performance; high specific surface area nano white carbon black (specific surface area is 250 m)2G) primary particle diameter less than 100nm, ability to be extremely largeGreatly improves the tear resistance and wear resistance of the rubber under high-temperature and high-pressure environment.
In this example, the use of clay as a filler can improve the hardness and acid resistance of the rubber without impairing the processability, and can avoid the problem of difficult processing and low yield of the rubber due to excessive use of the carbon black reinforcing agent.
In this embodiment, in order to improve the processability of the rubber and the fluidity of the material in the mold during vulcanization, a plasticizer may be added to the raw materials, and the plasticizer may be at least one of DOS plasticizer, DOP plasticizer, TP-95 plasticizer and TOTM plasticizer, and further may be two of them, where TOTM may improve the high temperature resistance of the rubber and DOS may improve the low temperature resistance of the rubber.
In this embodiment, the antioxidant may be at least one of RD antioxidant, 445 antioxidant, ZMTI antioxidant, and MB antioxidant, and further may be two of them, the antioxidant can slow down the aging speed of rubber and prolong the service life of rubber, wherein the antioxidant RD and MB have good synergistic effect, and the antioxidant 445 and ZMTI have good synergistic ability.
In the embodiment, di-tert-butylperoxyisopropyl benzene is used for replacing the traditional sulfur as a vulcanizing agent, and because di-tert-butylperoxyisopropyl benzene is used as peroxide, a C-C bond is formed during vulcanization crosslinking, the strength is higher than that of an S-S bond formed during sulfur vulcanization, the structural strength of a rubber molecular chain during vulcanization crosslinking into a net is increased, the rubber molecular chain has better temperature resistance and hydrogen sulfide corrosion resistance, and better structural strength of a rubber body is realized. The effective content of the di-tert-butylperoxycumene may be not less than 40%, for example, 60%.
In this embodiment, N' -m-phenylene bismaleimide as an auxiliary crosslinking agent can cooperate with peroxide to accelerate the vulcanization of hydrogenated nitrile rubber to form a higher crosslinked network structure and crosslinking density, so as to prolong the sealing ability and time. Because the packing time required when the pressure difference resistance reaches 105MPa is longer, namely at least 24h is packed at 177 ℃, a proper amount of crosslinking accelerator can generate the optimal mechanical property.
In this embodiment, according to the above raw material, the method for preparing the rubber material may include the steps of:
mixing for the first time: the following components were fed into a compounding machine in order:
preparing hydrogenated nitrile rubber in the raw materials;
preparing thermally cracked carbon black in the raw material;
preparing spray carbon black in the raw materials;
preparing nano white carbon black in raw materials;
preparing argil and a plasticizer in the raw materials;
self-contained anti-aging agents in the raw materials;
and (3) obtaining a master batch after the first mixing, and standing the master batch at room temperature for more than 8 hours, such as 10 hours. Wherein, the rotor speed of the mixing machine can be 70-80 rpm, further, can be 75rpm, the total mixing time can be 10-15 min, further, can be 10min, the requirement of the first mixing on the temperature can include glue discharging under the temperature condition of 90-100 ℃, further, can be 100 ℃. The master batch is parked for more than 8 hours at room temperature, so that the internal stress left in the first mixing process of the master batch can be eliminated, the dispersion of internal raw materials can be promoted, and the reinforcement is improved.
And (3) second mixing: the following components were fed into a compounding machine in order:
mother rubber;
preparing a vulcanizing agent and a crosslinking accelerator in the raw materials;
the glue is discharged at the temperature of 100-120 ℃, for example, 110 ℃. And then, performing thin-pass triangular bag beating on an open mill with a roll spacing of 0.5-1 mm for 3-5 times, and finally uniformly discharging the sheets to obtain the end rubber cylinder material. Wherein the rotor speed of the mixing machine may be 50 to 70rpm, further 65rpm, and the total mixing time may be 3 to 5min, further 4 min.
In this embodiment, according to the above raw materials, the method for preparing the rubber material may further include the steps of:
s01: mixing for the first time: the following components were fed into a compounding machine in order:
preparing hydrogenated nitrile rubber in the raw materials;
preparing thermally cracked carbon black in the feedstock;
preparing spray carbon black in the raw materials;
preparing nano white carbon black in raw materials;
preparing argil and a plasticizer in the raw materials;
self-contained anti-aging agents in the raw materials;
the masterbatch is obtained after the first mixing, and the masterbatch is parked for more than 8 hours, for example, 10 hours at room temperature, so that the internal stress left in the masterbatch mixing process can be eliminated. Wherein, the rotor speed of the mixing machine can be 70-80 rpm, further, can be 75rpm, the total mixing time can be 10-15 min, further, can be 10min, the requirement of the first mixing on the temperature can include glue discharging under the temperature condition of 90-100 ℃, further, can be 100 ℃. The master batch is parked for more than 8 hours at room temperature, so that the internal stress left in the first mixing process of the master batch can be eliminated, the dispersion of internal raw materials can be promoted, and the reinforcement is improved. This step may be the same as the first mixing in the preparation of the last end-part sleeve material.
S02: and (3) mixing for the second time: the following components were fed into a compounding machine in order:
mother rubber;
preparing a vulcanizing agent and a crosslinking accelerator in the raw materials;
the glue is discharged at the temperature of 100-120 ℃, for example, 110 ℃. And then, performing thin-pass triangular bag beating on an open mill with a roll spacing of 0.5-1 mm for 3-5 times, and finally uniformly discharging sheets to obtain the rubber material to be vulcanized of the rubber cylinder at the end part. Wherein the rotor speed of the mixing machine may be 50 to 70rpm, further 65rpm, and the total mixing time may be 3 to 5min, further 4 min. This step may be the same as the second mixing in the preparation of the last end packing material.
S03: standing the rubber material to be vulcanized for more than 8 hours at room temperature, then pre-drying the rubber material in a hot blast drying oven at 50-65 ℃ for 1.5-2.5 hours, and then pressing and molding the rubber material by a flat vulcanizing machine at the temperature of 90-100 ℃ and under the pressure of 20-25 MPa.
In this embodiment, the rubber material to be vulcanized is left at room temperature to uniformly diffuse the crosslinking accelerator in the raw material in the material, which is beneficial to the stability of the rubber material after the vulcanization in the later period.
The prebaking can make the inner and outer parts of the rubber reach a higher temperature: the rubber can be softened at first, the fluidity is increased, the later-stage compression molding is facilitated, the phenomenon that the rubber vulcanization is uneven due to the fact that the temperature difference between the outside and the inside is too high in the initial vulcanization stage is avoided, further, the pre-drying temperature can be 60 ℃, and the time can be 2 hours. The flat vulcanizing machine is one of vulcanizing machines, and can provide not only vulcanization environment conditions of rubber, but also temperature and pressure conditions for press molding of the rubber in a mold, and further the temperature for press molding can be 100 ℃ and the pressure can be 25 MPa.
S04: and carrying out primary vulcanization on the rubber material after the compression molding to obtain a first vulcanized product. The vulcanization temperature of the first vulcanization treatment can be controlled to be 145-155 ℃, the vulcanization time can be controlled to be 42-48 min, further, the vulcanization temperature can be 150 ℃, and the vulcanization time can be 45 min. The purpose of the first vulcanization is to ensure that most of rubber is vulcanized, form a net structure with high internal strength of the rubber and increase the mechanical strength of the rubber.
S05: and carrying out secondary vulcanization on the first vulcanization product to obtain the rubber material of the rubber sleeve at the end part of the packer. The second vulcanization can be carried out in a thermal aging test box, the temperature of the second vulcanization can be controlled to be 145-155 ℃, the vulcanization time can be controlled to be 3-5, further, the vulcanization temperature can be 150 ℃, and the vulcanization time can be 4 hours. The second vulcanization aims at further vulcanization to ensure more thorough vulcanization, the time consumption is longer because the vulcanization effect of the anti-aging box is not as good as that of a vulcanizing machine, but the cost performance is higher to further improve the vulcanization effect because the first vulcanization is basically finished.
In summary, the advantages of the high temperature and high pressure resistant packer of the present invention may include: the packer disclosed by the invention adopts the divider rubber barrel made of the high-temperature and high-pressure resistant rubber material, can resist high temperature of 180 ℃ and pressure difference of 105MPa, can effectively meet the technical requirements of deep wells and ultra-deep wells on the packer, is beneficial to the autonomy of exploitation of deep wells and ultra-deep well oil and gas wells in China, breaks through foreign monopoly, is also beneficial to reducing the technical difficulty and cost of exploitation of deep wells and ultra-deep wells oil and gas in China, and has a good application prospect.
Although the present invention has been described above in connection with exemplary embodiments, it will be apparent to those skilled in the art that various modifications and changes may be made to the exemplary embodiments of the present invention without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (15)
1. The packer is characterized by comprising a sealing part, an anchoring part, a righting part, a setting part, a locking part and an unsealing part, wherein the sealing part comprises a packer rubber barrel, and the rubber material of the packer rubber barrel is prepared from the following raw materials in parts by mass:
36-50% of hydrogenated nitrile rubber, 12-33% of spray carbon black, 1-14% of thermal cracking carbon black, 3-14% of nano white carbon black, 3-19% of argil, 1-9% of plasticizer, 0.5-2% of anti-aging agent, 0.5-2% of vulcanizing agent and 1-4% of crosslinking accelerator, wherein the rubber material can resist high temperature of 180 ℃ and pressure difference of 105 MPa.
2. The packer capable of resisting high temperature and high pressure according to claim 1, wherein the mass fraction of acrylonitrile in the hydrogenated nitrile rubber is 36-44%, the content of residual double bonds is less than 8%, and the raw rubber Mooney viscosity ML1+4 of the hydrogenated nitrile rubber at 100 ℃ is 50-100.
3. The packer capable of resisting high temperature and high pressure as claimed in claim 1, wherein the thermal cracking carbon black has a specific surface area of 7-12 m2/g。
4. A packer resistant to high temperature and high pressure, according to claim 1, wherein the plasticizer comprises at least one of DOS plasticizer, DOP plasticizer, TP-95 plasticizer and TOTM plasticizer.
5. The packer capable of resisting high temperature and high pressure according to claim 1, wherein the anti-aging agent comprises at least one of RD anti-aging agent, 445 anti-aging agent, ZMTI anti-aging agent and MB anti-aging agent.
6. The packer of claim 1, wherein the crosslinking promoter comprises N, N' -m-phenylene bismaleimide.
7. The packer of claim 1, wherein the vulcanizing agent comprises di-t-butylperoxyisopropyl benzene, and the effective content of the di-t-butylperoxyisopropyl benzene is not less than 40%.
8. A packer capable of withstanding high temperatures and high pressures according to claim 1, wherein the rubber material is prepared by a method comprising the steps of:
putting hydrogenated nitrile rubber, thermal cracking carbon black, spraying carbon black, nano white carbon black, pottery clay, a plasticizer and an anti-aging agent in the preparation raw materials into mixing equipment for first mixing, and discharging rubber for the first time to obtain master batch;
And (3) putting the master batch, the vulcanizing agent and the crosslinking accelerator in the preparation raw materials into mixing equipment for mixing for the second time, and discharging the rubber for the second time to obtain the high-temperature and high-pressure resistant rubber material.
9. The packer capable of resisting high temperature and high pressure according to claim 1, wherein the preparation method of the rubber material comprises the following steps:
putting hydrogenated nitrile rubber, thermal cracking carbon black, spraying carbon black, nano white carbon black, pottery clay, a plasticizer and an anti-aging agent in the preparation raw materials into mixing equipment for first mixing, and discharging rubber for the first time to obtain master batch;
putting the master batch, the vulcanizing agent and the crosslinking accelerator in the preparation raw materials into mixing equipment for mixing for the second time, and discharging rubber for the second time to obtain a rubber material to be vulcanized;
drying the rubber material to be vulcanized;
carrying out first vulcanization on the dried material to obtain a first vulcanization product;
and carrying out secondary vulcanization on the first vulcanized product to obtain the high-temperature and high-pressure resistant rubber material.
10. A packer according to claim 8 or 9, characterised in that before the second mixing, the method further comprises the steps of: and (3) placing the masterbatch for more than 8h at room temperature.
11. The high-temperature and high-pressure resistant packer according to claim 8 or 9, wherein the rotation speed of a rotor of the first mixing equipment is 70-80 rpm, the temperature of the first rubber discharge is 90-100 ℃, and the time is 10-15 min.
12. The high-temperature and high-pressure resistant packer as claimed in claim 8 or 9, wherein the rotor speed of the mixing equipment for the second mixing is 50-70 rpm, the temperature of the second glue discharging is 100-120 ℃, and the time is 3-5 min.
13. A packer according to claim 9, characterised in that before the first vulcanisation the method further comprises the steps of: and (3) placing the rubber material to be vulcanized at room temperature for more than 8 hours.
14. The packer capable of resisting high temperature and high pressure according to claim 9, wherein the temperature condition of the first vulcanization is 145-155 ℃ and the time is 42-48 min.
15. The packer capable of resisting high temperature and high pressure according to claim 9, wherein the temperature condition of the second vulcanization is 145-155 ℃ and the time is 3-5 h.
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