CN113530464A - Oil well pipe and method for manufacturing same - Google Patents

Oil well pipe and method for manufacturing same Download PDF

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Publication number
CN113530464A
CN113530464A CN202010306727.8A CN202010306727A CN113530464A CN 113530464 A CN113530464 A CN 113530464A CN 202010306727 A CN202010306727 A CN 202010306727A CN 113530464 A CN113530464 A CN 113530464A
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China
Prior art keywords
fiber
pipe
oil
impregnated tape
oil well
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Pending
Application number
CN202010306727.8A
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Chinese (zh)
Inventor
赵海洋
曾文广
张江江
郭玉洁
李芳�
秦飞
刘青山
胡广强
石鑫
孙同成
应海玲
陈朝
吴鹏举
孙海礁
魏晓静
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China Petroleum and Chemical Corp
Sinopec Northwest Oil Field Co
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China Petroleum and Chemical Corp
Sinopec Northwest Oil Field Co
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Priority to CN202010306727.8A priority Critical patent/CN113530464A/en
Publication of CN113530464A publication Critical patent/CN113530464A/en
Pending legal-status Critical Current

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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29DPRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D23/00Producing tubular articles
    • B29D23/001Pipes; Pipe joints
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B1/00Layered products having a general shape other than plane
    • B32B1/08Tubular products
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/12Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/28Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
    • B32B27/288Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42 comprising polyketones
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B33/00Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2260/00Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
    • B32B2260/02Composition of the impregnated, bonded or embedded layer
    • B32B2260/021Fibrous or filamentary layer
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2260/00Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
    • B32B2260/04Impregnation, embedding, or binder material
    • B32B2260/046Synthetic resin
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/10Inorganic fibres
    • B32B2262/101Glass fibres
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/10Inorganic fibres
    • B32B2262/106Carbon fibres, e.g. graphite fibres
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00Properties of the layers or laminate
    • B32B2307/30Properties of the layers or laminate having particular thermal properties
    • B32B2307/306Resistant to heat
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00Properties of the layers or laminate
    • B32B2307/50Properties of the layers or laminate having particular mechanical properties
    • B32B2307/582Tearability
    • B32B2307/5825Tear resistant
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00Properties of the layers or laminate
    • B32B2307/70Other properties
    • B32B2307/714Inert, i.e. inert to chemical degradation, corrosion
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2597/00Tubular articles, e.g. hoses, pipes

Abstract

The present invention relates to an oil country tubular good and a method for manufacturing the same. The oil well pipe comprises a first pipe body extending along the longitudinal direction, a second pipe body sleeved in the first pipe body and a fiber impregnated belt clamped between the first pipe body and the second pipe body, wherein the first pipe body and the second pipe body are made of polyether sulfone ketone containing a aza-naphthalene structure. The oil well pipe can keep stable structure and function even if used in a deep well.

Description

Oil well pipe and method for manufacturing same
Technical Field
The invention relates to the technical field of oil and gas wells, in particular to an oil well pipe used in an oil and gas well. The invention also relates to a method for manufacturing the oil well pipe.
Background
The oil well pipe is a structure necessary for oil and gas exploitation in the oil industry, and can be lowered into an oil and gas well to ensure the smooth progress of the processes of oil and gas well development and exploration, oil and gas transmission and the like.
Current oil well pipes are made of alloy steel. However, as the well depth of oil and gas wells increases, the working environment in the wells deteriorates. For example, in deep wells over 3000 meters deep, temperatures of at least 200 ℃ are reached, H2S and CO2The partial pressure is more than 1 MPa. At this time, the hanging weight of the pipe string is very large (e.g., more than 500T). In this case, the oil country tubular goods are easily cracked and are subject to corrosion. Corrosion is on the present site, with a tendency to increase year by year. Oil well pipe corrosion is prone to leakage and contamination in the well. Due to the existence of H in the well2S and other toxic and explosive harmful gases, which seriously affect environmental and personal safety.
Therefore, there is a need for an oil well pipe that can be used in deep wells while maintaining structural and functional stability, and a corresponding method of manufacture.
Disclosure of Invention
In view of the above problems, the present invention provides an oil country tubular good which can maintain structural and functional stability even when used in a deep well. The invention also provides a method for manufacturing the oil well pipe.
According to a first aspect of the present invention, an oil well pipe is provided, which includes a first pipe body extending in a longitudinal direction, a second pipe body sleeved in the first pipe body, and a fiber impregnated tape interposed between the first pipe body and the second pipe body, wherein the first pipe body and the second pipe body are made of polyethersulfone ketone containing a nitrogen-doped naphthalene structure.
The oil well pipe can resist corrosion at high temperature and high pressure, and can effectively reduce the hanging weight even if used in a deep well. Therefore, the oil well pipe can keep structural and functional stability in a deep well, is not easy to corrode, tear, leak and the like, further cannot cause pollution, and can effectively avoid threat to environmental safety and personal safety.
In one embodiment, the fibre impregnated tape sandwiched between the first and second tubular bodies comprises one or more layers, preferably 1 to 5 layers of fibre impregnated tape.
In one embodiment, the fiber-impregnated tape is made of at least one of carbon fibers and glass fibers in combination with a polyethersulfoneketone containing a nitrogenated heteronaphthalene structure.
In one embodiment, the thickness of the first and/or second tubular body is between 6mm and 30 mm.
According to a second aspect of the present invention, there is provided a method for manufacturing the above oil country tubular good, comprising the steps of: manufacturing a second pipe body by using the PPESK with the nitrogen-containing heteronaphthalene structure through an extrusion process, sleeving the fiber impregnation belt on the second pipe body, and forming the first pipe body of the PPESK with the nitrogen-containing heteronaphthalene structure outside the fiber impregnation belt through the extrusion process.
In one embodiment, the fiber-impregnated tape is manufactured by: dissolving polyether sulfone ketone containing an aza-naphthalene structure in a chloroform solution, soaking fiber cloth in the chloroform solution in which the polyether sulfone ketone containing the aza-naphthalene structure is dissolved, drying after the chloroform solution is evaporated and the polyether sulfone ketone is solidified on the fiber cloth, and preferably drying at the temperature of 80 ℃ for 2 hours to obtain the fiber impregnated belt. The fiber of the fiber impregnated belt obtained by the method is arranged neatly, and the structural stability of the oil well pipe is improved.
In one embodiment, the temperature of the extrusion process of the first and/or second tubular body is between 365 ℃ and 395 ℃, preferably between 365 ℃ and 385 ℃.
In one embodiment, after the second pipe body is extruded, the second pipe body passes through a heating die sleeved with a fiber impregnation belt, so that the fiber impregnation belt is sleeved and bonded on the outer side of the second pipe body.
In one embodiment, the warming die has a warming temperature between 365 ℃ and 375 ℃.
In one embodiment, the second tube sheathed with the fiber-impregnated tape is sheathed in a screw extruder by which the first tube is formed outside the second tube sheathed with the fiber-impregnated tape.
Compared with the prior art, the invention has the advantages that: the oil well pipe can resist corrosion at high temperature and high pressure, and can effectively reduce the hanging weight even if used in a deep well. Therefore, the oil well pipe can keep structural and functional stability in a deep well, is not easy to corrode, tear, leak and the like, further cannot cause pollution, and can effectively avoid threat to environmental safety and personal safety.
Drawings
The invention is described in more detail below with reference to the accompanying drawings. Wherein:
fig. 1 shows a schematic view of an oil well pipe according to an embodiment of the present invention.
In the drawings, like parts are provided with like reference numerals. The figures are not drawn to scale.
Detailed Description
The invention will be further explained with reference to the drawings.
Fig. 1 schematically shows a cross-section of an oil country tubular good 100 according to the invention. As shown in fig. 1, the oil country tubular good 100 includes a first tubular body 101, a fiber-impregnated tape 103, and a second tubular body 102, which are sequentially sleeved from the inside to the outside. Here, the first pipe body 101 and the second pipe body 102 are made of polyethersulfone ketone containing a nitrogen hetero naphthalene structure. The fiber-impregnated tape 103 is made of a fiber cloth of carbon fibers and/or glass fibers in combination with a polyethersulfoneketone containing a nitrogenated heteronaphthalene structure.
The first pipe 101 and the second pipe 102 may be manufactured by, for example, an extrusion process. The thickness of the first tube 101 and/or the second tube may be, for example, between 6mm and 30 mm.
The above-mentioned fibre-impregnated tape 103 may be, for example, one or more layers, preferably 1-5 layers. The overall thickness of the fiber-impregnated tape 103 interposed between the first tubular body 101 and the second tubular body 102 may be, for example, between 1mm and 10 mm. The thickness of the single-layer fibre-impregnated tape 103 may be, for example, between 1mm and 2 mm. The provision of the multi-layered fiber-impregnated tape is particularly advantageous in improving the internal pressure resistance of the oil country tubular good 100.
The oil country tubular good 100 can be produced, for example, as follows.
First, a fiber-impregnated tape 103 is prepared. The preparation process comprises the following steps: dissolving polyether sulfone ketone containing an aza-naphthalene structure in a chloroform solution; then, soaking the fiber cloth in the chloroform solution in which the PPESK containing the aza-naphthalene structure is dissolved; then, evaporating the chloroform solution and completely solidifying the PPESK on the fiber cloth; finally, drying is performed at a temperature of 80 ℃ for about 2 hours to obtain the fiber-impregnated tape 103 in which the fiber cloth is combined with the polyethersulfoneketone having the nitrogen-containing hetero-naphthalene structure.
Next, the second tubular body 102 having a cylindrical shape is manufactured from the polyethersulfone ketone having a nitrogen-containing naphthalene hetero structure by an extrusion process. The temperature of the extrusion process is for example between 365 ℃ and 395 ℃, preferably between 365 ℃ and 385 ℃.
After the second tube 102 is set, it is passed through a heating die covered with the fiber-impregnated tape 103. Thereby, the fiber-impregnated tape 103 can be sleeved and bonded outside the second tube 102. The heating temperature of the heating die may be, for example, 365 ℃ to 375 ℃, and is preferably about 10 ℃ lower than the temperature of the extrusion process.
Thereafter, the second pipe body 102, which has been sheathed with the fiber-impregnated tape 103, is sheathed in the screw extruder in a corresponding position. The first pipe 101 is extruded by the screw extruder out of the second pipe 102 in which the fiber-impregnated tape 103 is fitted. The extrusion temperature here can be, for example, between 365 ℃ and 395 ℃, preferably between 365 ℃ and 385 ℃.
Thereby, the oil country tubular good 100 of the present invention can be formed.
Advantageous effects of the oil country tubular good 100 and the method for manufacturing the same according to the present invention will be described in detail below with reference to various embodiments.
Example 1
An oil country tubular good 100 is formed by the above-described manufacturing method. The first pipe body 101 and the second pipe body 102 of the oil country tubular good 100 each have a thickness of 6 mm. The oil country tubular good 100 has 1 fiber-impregnated layer. The oil pipe load of the oil well pipe 100 is about 190 tons, the self weight of 3000m pipelines is about 45 tons, and the use requirement that the self weight does not exceed 50 percent of the self load is met.
The oil well pipe 100 is subjected to corrosion test under the conditions that actual working condition simulation liquid is added into the oil well pipe, two ends of the oil well pipe are blocked, and test gas (CO) for simulating actual working conditions is pressed outside the oil well pipe2And H2S). The experimental temperature of the corrosion process was 200 ℃ and the experimental time was 7 days and 45 days, respectively. Table 1 shows the results of some physical experiments on the oil country tubular good 100 before and after the above-described corrosion experiment.
TABLE 1 test results of the experiments before and after Corrosion
Figure BDA0002456049350000041
As can be seen from the above table, the tensile strength of the oil country tubular good 100 before and after corrosion is 640MPa or more, and the rate of change before and after corrosion is small. Therefore, the oil well pipe can be stably used for a pipe string with a hanging weight of 200 tons at a depth of 3000m or more at a high temperature of 200 ℃.
Example 2
An oil country tubular good 100 is formed by the above-described manufacturing method. The first pipe body 101 and the second pipe body 102 of the oil country tubular good 100 each have a thickness of 15 mm. The oil country tubular good 100 has 5 fiber-impregnated layers. The oil pipe load of the oil well pipe 100 is about 700 tons, the self weight of 3000m pipelines is about 130 tons, and the use requirement that the self weight does not exceed 50 percent of the self load is met.
The oil well pipe 100 is subjected to corrosion test under the conditions that actual working condition simulation liquid is added into the oil well pipe, two ends of the oil well pipe are blocked, and test gas (CO) for simulating actual working conditions is pressed outside the oil well pipe2And H2S). The experimental temperature of the corrosion process is 200 ℃, and the experiment is carried outThe time periods were 7 days and 45 days, respectively. Table 2 shows the results of some physical experiments on the oil country tubular good 100 before and after the above-described corrosion experiment.
TABLE 2 Experimental test results before and after Corrosion
Figure BDA0002456049350000051
As can be seen from the above table, the tensile strength of the oil country tubular good 100 before and after corrosion is 690MPa or more, and the rate of change before and after corrosion is small. Therefore, the oil well pipe can be stably used for a pipe string with a hanging weight of 700 tons at a depth of 3000m or more at a high temperature of 200 ℃.
Example 3
An oil country tubular good 100 is formed by the above-described manufacturing method. The first pipe body 101 and the second pipe body 102 of the oil country tubular good 100 each have a thickness of 30 mm. The oil country tubular good 100 has 3 fiber-impregnated layers. The oil pipe load of the oil well pipe 100 is about 1500 tons, the self weight of 3000m pipelines is about 257 tons, and the use requirement that the self weight does not exceed 50% of the self load is met.
The oil well pipe 100 is subjected to corrosion test under the conditions that actual working condition simulation liquid is added into the oil well pipe, two ends of the oil well pipe are blocked, and test gas (CO) for simulating actual working conditions is pressed outside the oil well pipe2And H2S). The experimental temperature of the corrosion process was 200 ℃ and the experimental time was 7 days and 45 days, respectively. Table 3 shows the results of some physical experiments on the oil country tubular good 100 before and after the above-described corrosion experiment.
TABLE 3 test results of the experiments before and after corrosion
Figure BDA0002456049350000061
As can be seen from the above table, the tensile strength of the oil country tubular good 100 before and after corrosion is 660MPa or more, and the rate of change before and after corrosion is small. Therefore, the oil well pipe can be stably used for a pipe string with a hanging weight of 1500 tons at a depth of 3000m or more at a high temperature of 200 ℃.
Example 4
An oil country tubular good 100 is formed by the above-described manufacturing method. The first pipe body 101 and the second pipe body 102 of the oil country tubular good 100 each have a thickness of 17 mm. The oil country tubular good 100 has 3 fiber-impregnated layers. The oil pipe load of the oil well pipe 100 is about 700 tons, the self weight of 3000m pipelines is about 121 tons, and the use requirement that the self weight does not exceed 50 percent of the self load is met.
The oil well pipe 100 is subjected to corrosion test under the conditions that actual working condition simulation liquid is added into the oil well pipe, two ends of the oil well pipe are blocked, and test gas (CO) for simulating actual working conditions is pressed outside the oil well pipe2And H2S). The experimental temperature of the corrosion process was 200 ℃ and the experimental time was 7 days and 45 days, respectively. Table 4 shows the results of some physical experiments on the oil country tubular good 100 before and after the above-described corrosion experiment.
TABLE 4 test results of the experiments before and after Corrosion
Figure BDA0002456049350000071
As can be seen from the above table, the tensile strength of the oil country tubular good 100 before and after corrosion is 650MPa or more, and the rate of change before and after corrosion is small. Therefore, the oil well pipe can be stably used for a pipe string with a hanging weight of 700 tons at a depth of 3000m or more at a high temperature of 200 ℃.
Comparative example 1
An experiment was conducted using an oil well pipe made of carbon steel and having the same dimensional appearance as the oil well pipe in example 1. The experimental procedure and conditions were the same as in example 1. Table 5 shows some physical test results of the oil well pipe before and after the corrosion test.
TABLE 5 test results of the experiments before and after Corrosion
Figure BDA0002456049350000072
Figure BDA0002456049350000081
It is apparent that the performance of the oil country tubular good of comparative example 1 is greatly reduced after corrosion, in contrast to the above examples 1 to 4. Such oil well pipes are not suitable for deep wells of about 3000 meters.
Based on this, the oil well pipe 100 correspondingly manufactured by the oil well pipe manufacturing method of the present invention can be stably used in a deep well with a depth of about 3000 meters, and the problems of cracking, leakage and the like are not easy to occur, thereby being favorable for avoiding formation pollution and ensuring the personal safety of operating personnel.
While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. It is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.

Claims (10)

1. The utility model provides an oil well pipe, includes along the first body of longitudinal direction extension, the cover is established second body in the first body to and press from both sides and establish first body with fibre flooding area between the second body, first body with the second body is made by the polyether sulfone ketone who contains the aza naphthalene structure.
2. Oil country tubular good according to claim 1, characterized in that the fibre impregnated tape sandwiched between the first tubular body and the second tubular body is provided with one or more layers, preferably comprising 1 to 5 layers of fibre impregnated tape.
3. The oil country tubular good according to claim 1 or 2, characterized in that the fiber-impregnated tape is made of at least one of carbon fiber and glass fiber in combination with polyethersulfoneketone containing a nitrogen-containing hetero-naphthalene structure.
4. Oil country tubular good according to any one of claims 1-3, characterized in that the first tubular body and/or the second tubular body has a thickness between 6mm and 30 mm.
5. A method for manufacturing an oil well pipe according to any one of claims 1 to 4, comprising the steps of:
the second pipe body is manufactured by using the PPESK containing the nitrogen heteronaphthalene structure through an extrusion process,
the second pipe body is provided with the fiber impregnated tape in a sleeved manner, and
and forming a first pipe body of the polyether sulfone ketone containing the aza-naphthalene structure outside the fiber impregnation zone through an extrusion process.
6. The method according to claim 5, characterized in that the fiber-impregnated tape is manufactured by the steps of:
dissolving polyether sulfone ketone containing aza-naphthalene structure in chloroform solution,
soaking the fiber cloth in chloroform solution dissolved with polyether sulfone ketone containing aza-naphthalene structure,
and after the chloroform solution is evaporated and the PPESK is solidified on the fiber cloth, drying, preferably drying below 80 ℃ for 2 hours to obtain the fiber impregnated belt.
7. A method according to claim 5 or 6, wherein the temperature of the extrusion process of the first and/or second tubular body is between 365 ℃ and 395 ℃, preferably between 365 ℃ and 385 ℃.
8. The method of any one of claims 5 to 7, wherein after the second tube is extruded, the second tube is passed through a warming die that is sheathed with a fiber impregnated tape such that the fiber impregnated tape is sheathed and bonded outside the second tube.
9. The method according to claim 8, characterized in that the warming temperature of the warming die is between 365 ℃ and 375 ℃.
10. A method according to any one of claims 5 to 9, characterised by sleeving the second tube provided with the fibre-impregnated tape in a screw extruder by which the first tube is formed outside the second tube provided with the fibre-impregnated tape.
CN202010306727.8A 2020-04-17 2020-04-17 Oil well pipe and method for manufacturing same Pending CN113530464A (en)

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