CN113527878A - Low-friction-coefficient and wear-resistant material, preparation method thereof and sucker rod centralizer - Google Patents
Low-friction-coefficient and wear-resistant material, preparation method thereof and sucker rod centralizer Download PDFInfo
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- CN113527878A CN113527878A CN202110944857.9A CN202110944857A CN113527878A CN 113527878 A CN113527878 A CN 113527878A CN 202110944857 A CN202110944857 A CN 202110944857A CN 113527878 A CN113527878 A CN 113527878A
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- wear
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L77/00—Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Compositions of derivatives of such polymers
- C08L77/06—Polyamides derived from polyamines and polycarboxylic acids
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/10—Wear protectors; Centralising devices, e.g. stabilisers
- E21B17/1071—Wear protectors; Centralising devices, e.g. stabilisers specially adapted for pump rods, e.g. sucker rods
-
- 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
- C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
- C08K2003/3009—Sulfides
Abstract
The invention relates to the technical field of composite materials, in particular to a low-friction-coefficient wear-resistant material and a preparation method thereof, wherein the low-friction-coefficient wear-resistant material comprises PA66, a nylon compatilizer, glass fibers, a filler, an antioxidant, a lubricant and a wear-resistant agent, and can improve the excellent performance of the material and achieve the use effects of reducing the friction coefficient and resisting wear; like this at the in-service use in-process, can effectual reduction sucker rod and the sleeve pipe between the friction, improve the life of sucker rod and sleeve pipe, reduce other extra losses that lead to because of the change.
Description
Technical Field
The invention relates to the technical field of composite materials, in particular to a low-friction-coefficient wear-resistant material, a preparation method thereof and a sucker rod centralizer.
Background
The sucker rod centralizer is an anti-eccentric-wear downhole tool of a pumping well, is suitable for an eccentric-wear pumping well, particularly suitable for an eccentric-wear pumping well above a neutral point of a sucker rod and a directional inclined well, and has better anti-eccentric-wear effect when matched with a nylon centralizer on a pumping rod body below the neutral point; the sucker rod moves up and down in the oil pipe, the rod and the wall of the oil pipe are easy to generate friction due to the elastic deformation of the sucker rod, the sucker rod is easy to break off, and the sucker rod centralizer has strong flexibility and is in contact with the inner wall of the oil pipe, so that the friction between the rod and the pipe can be reduced, and the oil extraction service life of the oil pumping unit is prolonged.
The sucker rod centralizer is usually made of nylon materials, the traditional nylon materials are large in friction coefficient and low in abrasion resistance, a large amount of abrasion can be caused, in the actual use process, the sucker rod centralizer is short in service life and needs to be replaced frequently, so that an oil pumping well needs to be stopped frequently, and an underground sucker rod is pumped out for replacement; the replacement of the sucker rod is not only complex in operation, but also can cause the work of pumping oil normally after the sucker rod is replaced, thus causing serious economic loss.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a low-friction-coefficient wear-resistant material and a preparation method thereof.
The invention is realized by the following technical scheme: a low-friction-coefficient and wear-resistant material comprises PA66, a nylon compatilizer, glass fiber, filler, an antioxidant, a lubricant and a wear-resistant agent,
wherein the weight parts of the raw materials are as follows: PA6656-58 parts, nylon compatilizer 3.95-4.05 parts, glass fiber 31-33 parts, filler 2.5-3.5 parts, antioxidant 0.9-1.1 parts, lubricant 0.9-1.1 parts, and wear-resisting agent 2% +/-0.1%.
Furthermore, the nylon compatilizer is vegetable fat TAF.
Further, the filler is talcum powder.
Furthermore, the antioxidant is tris [2, 4-di-tert-butylphenyl ] phosphite.
Furthermore, the lubricant is pentaerythritol stearate.
Further, the anti-wear agent is MOS2。
A preparation method of a low-friction-coefficient and wear-resistant material comprises the following steps:
(1) drying raw materials: drying the raw materials of each component to reach the standard that the moisture of the raw materials is controlled below 4 per thousand, wherein the drying temperature is not more than 100 ℃;
(2) mixing and stirring raw materials: weighing PA6656-58 parts, nylon compatilizer 3.95-4.05 parts, glass fiber 31-33 parts, filler 2.5-3.5 parts, antioxidant 0.9-1.1 parts, lubricant 0.9-1.1 parts and wear-resistant agent 1.9-2.1 parts, mixing and stirring; the feeding sequence is that PA66 is firstly fed, then antioxidant, lubricant and wear-resistant agent are added, and the stirring time is 3-5 minutes;
(3) heating and melting: the heating temperature is 145-275 ℃;
(4) mixing: the mixing temperature is 255-265 ℃;
(5) extruding strips: the temperature of the splicing strips is 275 ℃ and 295 ℃, and the pressure is controlled to be-0.04 to-0.06 MPa;
(6) and (3) cooling: the temperature of cooling water is controlled at 30-50 ℃;
(7) pelletizing: cutting into granules according to the specification;
(8) screening: screening the particles according to the specification;
(9) and (4) uniform packaging: and subpackaging according to the specification.
The sucker rod centralizer comprises a guide layer made of a low-friction-coefficient and wear-resistant material, wherein a connecting layer is arranged in the guide layer, and a connecting device is arranged between the connecting layer and the guide layer.
Further, the connecting layer is made of high-molecular elastic materials, the connecting device comprises a connecting column integrally formed with the connecting layer, and the guide layer is provided with a connecting hole matched with the connecting column.
The invention has the beneficial effects that: according to the technical scheme, the traditional nylon material is subjected to ingredient adjustment and production process improvement, so that the excellent performance of the material can be improved, and the use effects of reducing the friction coefficient and resisting wear are achieved; like this at the in-service use in-process, can effectual reduction sucker rod and the sleeve pipe between the friction, improve the life of sucker rod and sleeve pipe, reduce other extra losses that lead to because of the change.
Drawings
FIG. 1 is a schematic view of a preparation process.
FIG. 2 is a schematic front view of a sucker rod centralizer;
FIG. 3 is a schematic top view of a sucker rod centralizer;
FIG. 4 is a schematic cross-sectional view of a sucker rod centralizer;
FIG. 5 is a schematic view of a connecting layer structure;
FIG. 6 is a schematic view of the structure of the guide sleeve and the connecting column;
wherein: the cable comprises a guide layer 1, a guide convex edge 2, a connecting column 3, a connecting layer 4, a guide sleeve 5 and a stay cable 6.
Detailed Description
In the description of the present invention, it is also to be noted that, unless explicitly stated or limited otherwise; the specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments; all other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the following embodiments, PA66 is EPR27 of China's Pingtao Hoomai group, which is used for manufacturing a sucker rod centralizer and has low friction coefficient and small volume abrasion;
the nylon compatilizer is vegetable fat TAF;
the glass fiber is EDR14-2000-988A of Zhejiang Kyolite group Limited;
the filler is talcum powder of Haicheng New Guangyuan powder material Co;
the antioxidant is tris [2, 4-di-tert-butylphenyl ] phosphite;
the lubricant is pentaerythritol stearate;
the wear-resisting agent is MOS2。
The preparation method comprises the following steps:
as shown in figure 1 of the drawings, in which,
(1) drying raw materials: the raw materials of each component are dried to reach the standard that the moisture content of the raw materials is controlled below 4 per thousand, the processing difficulty is increased due to the excessively high moisture content, the product quality can be ensured by controlling the moisture content to be 4 per thousand, the drying temperature is not more than 100 ℃, and when the temperature is over 100 ℃, the raw materials are yellowed, so that the attractiveness of finished products is influenced;
(2) mixing and stirring raw materials: weighing PA66, a nylon compatilizer, glass fiber, a filler, an antioxidant, a lubricant and a wear-resistant agent, and mixing and stirring; the feeding sequence is that PA66 is firstly fed, then antioxidant, lubricant and wear-resistant agent are added, and the stirring time is 3-5 minutes;
(3) heating and melting: the heating temperature is 145-275 ℃, the materials are heated to 145-155 ℃ for preheating in the heating and melting process, and then heated to 265-275 ℃ for melting, the melting point of PA66 is 260 ℃, the melting uniformity can be ensured, and the excessive oxidation of the material surface can be avoided;
(4) mixing: the mixing temperature is 255-265 ℃, the raw materials are stirred by a screw to generate heat, so the temperature needs to be reduced, and the PA66 is protected;
(5) extruding strips: the temperature of the strip splicing is 275-;
(6) and (3) cooling: the temperature of cooling water is controlled to be 30-50 ℃, the strip can be cooled too fast when the temperature is lower than 30 ℃, so that the hardness of the strip is high, the cutting of forming is influenced, the temperature of water higher than 50 ℃ is too high, manual operation and strip forming are hindered, the temperature is controlled to be 30-50 ℃, and the forming stability can be ensured;
(7) pelletizing: cutting into granules according to the specification, wherein in the following examples, the specification of the granules is that the length is 3mm +/-0.5, and the diameter is 3mm +/-0.5;
(8) screening: the granules are screened according to the specification, in the following examples, the specification of the granules is that the length is 3mm +/-0.5, and the diameter is 3mm +/-0.5;
(9) and (4) uniform packaging: according to the specification, the materials are packaged according to the specification, in the following examples, the specification of each package is 25kg +/-0.2 kg, the internal pressure is-0.02 MPa +/-0.01 MPa, and the aging is avoided.
The prepared sucker rod centralizer is shown in figures 2-5, and comprises a guide layer 1 made of a low-friction-coefficient and wear-resistant material, wherein the guide layer is composed of two symmetrical halves, four parallel guide convex ridges 2 are integrally formed outside the guide layer, the four guide convex ridges are uniformly distributed, the sucker rod is guided during use to reduce the stress deformation of the sucker rod and further avoid the friction between the sucker rod and the inner wall of an oil pipe, the use stability and the service life are improved, a connecting layer 4 is arranged in the guide layer, a connecting device is arranged between the connecting layer and the guide layer, specifically, the connecting layer is made of a high-polymer elastic material, specifically, PE foam of Shenzhen Lixinli technology Limited company is selected, the connecting device comprises connecting columns 3 which are integrally formed with the connecting layer, the connecting columns are four rows, four grooves corresponding to the guide convex ridges are formed, and connecting holes matched with the connecting columns are processed on the guide layer, the guide layer is also composed of two symmetrical halves, when in assembly, the difference between the seam of the connecting layer and the seam of the guide layer is 90 degrees, an interlocking structure is formed after the installation is finished, the falling is prevented, the seam of the connecting layer is larger, the connecting layer is extruded and deformed in the installation process, the two halves of the guide layer are spliced, in order to enable the connection to be more stable, the connecting column is in a circular table shape, one end with a smaller cross section is connected with the connecting layer, the connecting hole is made into a corresponding conical hole, the opening is outward, as the connecting column is made of PE foam, the connecting hole can be inserted after the compression, the resetting is carried out after the loosening, low-viscosity adhesive is injected into the connecting layer through the connecting column, particularly 406 low-viscosity adhesive of Homota adhesive limited company of Dongguan city, the curing speed of the adhesive is high, the adhesive can be filled in the connecting column and the connecting layer close connection column, and the connecting column and the connecting layer close connection column of the connecting column are hardened after the curing, the connecting layer and the guide layer are made into two sections, so that the lateral installation can be realized, the maintenance is convenient, in addition, the sucker rod centralizer is only made of low-friction-coefficient and wear-resistant materials, PE foam and 406 low-viscosity glue, the structure is simple, the cost is low, harmful metal substances are not introduced, and the sucker rod centralizer is suitable for oil fields.
For making things convenient for the spliced pole to insert the connecting hole, when the installation, suit uide bushing 5 on the spliced pole, the uide bushing is the nylon cover, and the uide bushing external diameter is less than the minimum external diameter of connecting hole, ties up the spliced pole through the uide bushing compression, conveniently inserts in the connecting hole, and the uide bushing outer end is convex, conveniently inserts in the connecting hole, still is connected with cable 6 in the outer end of uide bushing, when the installation, passes the connecting hole with the cable now, and then leads the uide bushing, easy to assemble.
Example 1
A low-friction-coefficient wear-resistant material is prepared from PA6656 Kg, nylon compatibilizer 4Kg, glass fiber 31Kg, filler 3Kg, antioxidant 0.9Kg, lubricant 1Kg, and wear-resistant agent 1.9Kg, and the test results are shown in attached Table 1.
Example 2
A low-friction-coefficient wear-resistant material is prepared from PA 6658 Kg, nylon compatibilizer 4.03Kg, glass fiber 33Kg, filler 2.8Kg, antioxidant 1Kg, lubricant 1Kg, and wear-resistant agent 2Kg, and the test results are shown in attached Table 1.
Example 3
A low-friction-coefficient wear-resistant material is prepared from PA 6657 Kg, nylon compatibilizer 4Kg, glass fiber 32Kg, filler 3Kg, antioxidant 1Kg, lubricant 1Kg, and wear-resistant agent 2Kg, and the test results are shown in attached Table 1.
Example 4
A low-friction-coefficient wear-resistant material is prepared from PA6657.5 Kg, nylon compatibilizer 3.95Kg, glass fiber 31Kg, filler 2.5Kg, antioxidant 0.9Kg, lubricant 0.9Kg, and wear-resistant agent 1.9Kg, and the test results are shown in attached Table 1.
Attached table 1
| Coefficient of friction/. mu. | Volume abrasion/g/cm3 | |
| Example 1 | 0.016 | 0.0074 |
| Example 2 | 0.013 | 0.0070 |
| Example 3 | 0.015 | 0.0080 |
| Example 4 | 0.018 | 0.0096 |
| Comparative example 1 | 0.34 (Dry state) | 0.085 |
In FIG. 1, comparative example 1 is PA 66.
The friction coefficient detection method comprises the following steps: under the conditions of room temperature (23 +/-5) DEG C and relative humidity (50 +/-5)%, the test sample is kept static in the test, the lubricant adopts 46# anti-wear hydraulic oil, the test ring rotates at 200r/min, the test time is 2h, and the load is 196N.
The detection method of the volume abrasion comprises the following steps: under the same test conditions, the mass m1 before abrasion, the mass m2 after abrasion, and the density ρ of the sample were measured, and therefore the volume abrasion was (m1-m2)/ρ.
Detection standard: according to the detection method, the friction coefficient mu is less than or equal to 0.018, and the volume abrasion is less than or equal to 0.073g/cm 3.
As can be seen from the above table, the examples 1-4 adjust the ratio of each component of the raw materials within a proper range, so as to not change the friction coefficient and the wear resistance of the finished material, and to better optimize the friction coefficient and the wear resistance compared with the conventional material (comparative example 1).
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (9)
1. A low coefficient of friction and wear resistant material characterized by: the nylon composite material comprises PA66, a nylon compatilizer, glass fiber, a filler, an antioxidant, a lubricant and an anti-wear agent, wherein the weight parts of the raw materials are as follows: PA6656-58 parts, nylon compatilizer 3.95-4.05 parts, glass fiber 31-33 parts, filler 2.5-3.5 parts, antioxidant 0.9-1.1 parts, lubricant 0.9-1.1 parts, and wear-resisting agent 2% +/-0.1%.
2. A low coefficient of friction and wear resistant material as claimed in claim 1, wherein: the nylon compatilizer is vegetable oil TAF.
3. A low coefficient of friction and wear resistant material as claimed in claim 1, wherein: the filler is talcum powder.
4. A low coefficient of friction and wear resistant material as claimed in claim 1, wherein: the antioxidant is tris [2, 4-di-tert-butylphenyl ] phosphite.
5. A low coefficient of friction and wear resistant material as claimed in claim 1, wherein: the lubricant is pentaerythritol stearate.
6. A low coefficient of friction and wear resistant material as claimed in claim 1, wherein: the wear-resisting agent is MOS2。
7. A method for preparing a low coefficient of friction and wear resistant material according to claim 1, characterized in that: the method comprises the following steps:
(1) drying raw materials: drying the raw materials of each component to reach the standard that the moisture of the raw materials is controlled below 4 per thousand, wherein the drying temperature is not more than 100 ℃;
(2) mixing and stirring raw materials: weighing PA6656-58 parts, nylon compatilizer 3.95-4.05 parts, glass fiber 31-33 parts, filler 2.5-3.5 parts, antioxidant 0.9-1.1 parts, lubricant 0.9-1.1 parts and wear-resistant agent 1.9-2.1 parts, mixing and stirring; the feeding sequence is that PA66 is firstly fed, then antioxidant, lubricant and wear-resistant agent are added, and the stirring time is 3-5 minutes;
(3) heating and melting: the heating temperature is 145-275 ℃;
(4) mixing: the mixing temperature is 255-265 ℃;
(5) extruding strips: the temperature of the splicing strips is 275 ℃ and 295 ℃, and the pressure is controlled to be-0.04 to-0.06 MPa;
(6) and (3) cooling: the temperature of cooling water is controlled at 30-50 ℃;
(7) pelletizing: cutting into granules;
(8) screening: screening the particles;
(9) and (4) uniform packaging: and (5) subpackaging.
8. A sucker rod centralizer made of the low-friction wear-resistant material of claim 1 comprising a guide layer made of the low-friction wear-resistant material, wherein a connecting layer is arranged in the guide layer, and a connecting device is arranged between the connecting layer and the guide layer.
9. The sucker rod centralizer of claim 8, wherein the connecting layer is made of a high polymer elastic material, the connecting device comprises a connecting column integrally formed with the connecting layer, and the guide layer is provided with a connecting hole matched with the connecting column.
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|---|---|---|---|---|
| CN101760022A (en) * | 2009-11-27 | 2010-06-30 | 平顶山华邦工程塑料有限公司 | Nylon 66 composition for petroleum sucker rod centralizer material |
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2021
- 2021-08-17 CN CN202110944857.9A patent/CN113527878A/en active Pending
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