CN115059411B - Composite continuous oil pipe and manufacturing method - Google Patents
Composite continuous oil pipe and manufacturing method Download PDFInfo
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- CN115059411B CN115059411B CN202210653331.XA CN202210653331A CN115059411B CN 115059411 B CN115059411 B CN 115059411B CN 202210653331 A CN202210653331 A CN 202210653331A CN 115059411 B CN115059411 B CN 115059411B
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- Prior art keywords
- coiled tubing
- composite
- oil pipe
- cable
- combination
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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
- E21B17/20—Flexible or articulated drilling pipes, e.g. flexible or articulated rods, pipes or cables
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D23/00—Producing tubular articles
- B29D23/001—Pipes; Pipe joints
Abstract
The invention discloses a composite coiled tubing and a manufacturing method thereof, wherein the composite coiled tubing structure comprises a coiled tubing body and a lining pipe; the cable is wound on the outer side wall of the lining pipe, the cable is attached and supported between the coiled tubing body and the lining pipe, a filling gap is formed between the coiled tubing body and the lining pipe, and a filling material is condensed in the filling gap. The manufacturing method comprises the following steps: winding and bonding a cable on the outer side of the lining pipe to form a cable lining combination body; sleeving the cable liner combination into an inner cavity of the continuous oil pipe body, and injecting uncured photosensitive resin or thermosetting resin into the filling gap to form a composite oil pipe combination; plugging two ends of the composite oil pipe combination body, placing a light source or a heating rod in the composite oil pipe combination body, and leading out a power supply line from the end head of the composite oil pipe combination body; inflating the inner cavity of the combined body of the composite oil pipe; the power supply line is dragged at a constant speed so that the light source or the heating rod promotes the photosensitive resin or the thermosetting resin to be solidified.
Description
Technical Field
The invention relates to the technical field of oil field mechanical oil extraction, in particular to a composite continuous oil pipe and a manufacturing method thereof.
Background
The coiled tubing is also called as flexible tubing, coiled tubing or coiled tubing, and refers to a jointless coiled tubing which can be wound on a large-diameter reel, is formed by connecting a plurality of sections of steel strips in an inclined manner, and is formed by rolling, forming and welding. The continuous oil pipe with the characteristics of high strength and high toughness has the appearance similar to a cable which is coiled by more than two meters, has high automation and good maneuverability, enables the operation to be safer, more efficient and more environment-friendly, is applied to the petroleum industry, and is widely applied to the fields of various oil and gas operations in the last two decades.
Besides being used for oil gathering and transportation, the coiled tubing can be widely used in the fields of oil field drilling, well completion, fracturing, acidification, liquid discharge, oil testing, oil and gas production, well repair, gathering and transportation pipeline plugging removal and the like at present, and more than 10 processes can be used in the aspect of well repair. Because of the wide application range, a technology can be compared favorably with the prior art. In the oil and gas industry, coiled tubing and its working equipment are figuratively referred to as "universal work machines".
However, due to the high cost of coiled tubing, a great deal of cost is consumed for scrapping old coiled tubing which cannot meet the drilling requirement in strength and manufacturing new coiled tubing, and meanwhile, the strength and the service life of the coiled tubing need to be further improved and prolonged.
Therefore, how to provide a coiled tubing with better structural performance and a simpler and more efficient coiled tubing manufacturing method is a problem that needs to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, the present invention provides a composite coiled tubing and a manufacturing method thereof, and aims to solve the above technical problems.
In order to achieve the purpose, the invention adopts the following technical scheme:
the composite coiled tubing structure provided by the invention comprises a coiled tubing body and a lining tube sleeved in an inner cavity of the coiled tubing body; the cable is wound on the outer side wall of the lining pipe, the cable is supported between the coiled tubing body and the lining pipe in an attaching mode, a filling gap is formed between the coiled tubing body and the lining pipe, and a filling material is condensed in the filling gap.
Preferably, the coiled tubing body is a coiled tubing for well drilling; the lining pipe is a fiber reinforced hose; the cable is a power supply or communication cable.
Preferably, the filler is a photosensitive resin or a thermosetting resin.
Photosensitive resin (photopolymer): by exposure, the molecular structure can be chemically changed in a very short time, and various physical changes such as solubility, insolubility, coloration, hardening and the like can be caused when the compound is exposed to a solvent. It is used as photosensitive material and has excellent effect. Photosensitive resin refers to a non-silver photosensitive material that produces an image using the property that some polymers have photodecomposition, or the property that some monomers have photopolymerization or photocrosslinking. The photosensitive resin has photosensitivity because it contains a photosensitive functional group. The photosensitive resin can generate different photochemical reactions due to different types of photosensitive groups, such as photodecomposition, photocrosslinking, photopolymerization and the like. In practical photosensitive resin systems, two changes may also occur simultaneously, such as photopolymerization and photocrosslinking, photodecomposition and photocrosslinking, etc.
The preparation method comprises the following steps:
(1) a photosensitive compound is added to a polymer compound, and the polymer compound is reacted with light irradiation, for example, dichromate is added to gelatin or polyvinyl alcohol, or a diazo compound is added to cyclized rubber. (2) Is prepared by direct photopolymerization of vinyl monomers with photopolymerization capability.
Thermosetting resin (thermosetting resin): the resin is a resin which can be gradually hardened and formed after being heated, and can not be softened or dissolved after being heated.
The thermosetting resin has a molecular structure of a body type and comprises most of condensation resin, and has the advantages of high heat resistance and difficult deformation under pressure. Examples of the thermosetting resin include phenol resins, epoxy resins, amino resins, unsaturated polyester resins, and silyl ether resins.
Thermosetting resin refers to a large class of synthetic resins that undergo chemical reaction under heat and pressure or under the action of curing agents and ultraviolet light, and are crosslinked and cured into insoluble and infusible substances. Such resins are generally solids or viscous liquids of low molecular weight prior to curing; can soften or flow in the forming process, has plasticity, can be made into a certain shape, and simultaneously has chemical reaction to crosslink and solidify; some by-products, such as water, are sometimes evolved. This reaction is irreversible, and once cured, it is not possible to soften or flow again by heating under pressure; if the temperature is too high, the material is decomposed or carbonized. This is a fundamental difference from the thermoplastic resin.
The composite continuous oil pipe is manufactured by the following method:
s1, cleaning the inner wall of the coiled tubing body, aiming at improving the bonding strength of a filling material and the inner wall of the coiled tubing body, wherein the cleaning mode comprises chemical cleaning and mechanical cleaning, the chemical cleaning adopts an organic solvent to remove oil stains and attached impurities on the inner wall of the coiled tubing body, and the mechanical cleaning adopts a shot blasting method to remove oxide skin on the inner wall of the coiled tubing body;
s2, winding and bonding the cable outside the lining pipe in an equidistant spiral line mode to form a cable lining combination body;
s3, pulling the cable liner combination into the inner cavity of the continuous oil pipe body through traction of a traction rope, injecting uncured photosensitive resin or thermosetting resin into the filling gap, and exhausting gas in the filling gap to form a composite oil pipe combination;
s4, plugging two ends of the composite oil pipe combination body, placing a light source or a heating rod in the composite oil pipe combination body, and leading out a power supply line of the light source or the heating rod from one end head of the composite oil pipe combination body; specifically, two ends of the lining pipe are turned outwards to wrap the outer wall of the end head of the coiled tubing body, two ends of the composite tubing assembly are respectively provided with a gas injection pressure cap and a sealing pressure cap in a sealing and buckling mode, and the gas injection pressure cap and the sealing pressure cap are tightly pressed on the outer wall of the coiled tubing body through a plurality of locking screws which are radially connected; the gas injection pressure cap is provided with a gas injection port for connecting with a high-pressure air compressor, the middle part of the sealing pressure cap is provided with an opening, a sealing rubber ring is embedded in the opening, and the power supply line penetrates through the sealing rubber ring and is attached and sealed with the sealing rubber ring;
s5, inflating the inner cavity of the composite oil pipe combination body to enable the lining pipe to keep a circular tensioning state; dragging the power supply line at a constant speed to enable the light source or the heating rod to move from one end of the inner cavity of the composite oil pipe combination body to the other end of the inner cavity of the composite oil pipe combination body, and promoting the photosensitive resin or the thermosetting resin to solidify, so that the continuous oil pipe body, the lining pipe, the cable and the photosensitive resin or the thermosetting resin are solidified into a whole.
When filling with the photosensitive resin, a light source is used to facilitate the reaction; when filling with a thermosetting resin, a heating rod is used to facilitate the reaction.
The sealing pressing cap is used for pressing the lining tube tightly and providing a channel for the power supply line of the light source or the heating rod; the outer side of the sealing pressing cap is provided with a round hole, the sealing rubber ring is arranged in the round hole, and the sealing rubber ring has the function of sealing the pressure in the lining pipe while ensuring that the power supply line can pass through.
According to the technical scheme, compared with the prior art, the invention discloses and provides the composite continuous oil pipe and the manufacturing method thereof, and the composite continuous oil pipe has the following beneficial effects:
1. the composite continuous oil pipe provided by the invention has the advantages of simple manufacturing method, high efficiency and low cost.
2. The composite continuous oil pipe provided by the invention can provide a power supply and communication solution for underground operations such as drilling, oil extraction, well logging, fracturing and the like in the petroleum field.
3. The method is suitable for new and old coiled tubing, and especially for old coiled tubing with strength not meeting the drilling requirement, the method can be used for reforming the composite coiled tubing for operations such as oil extraction, well logging and the like.
4. The number of the cables of the composite coiled tubing provided by the invention can be distributed according to the inner diameter of the coiled tubing and actual needs.
5. The cable provided by the invention has an oval cross section, is spirally wound on the lining pipe, and has more metal wires, higher strength and better performance of a single-stranded cable.
6. The cable provided by the invention has an oval cross section, is spirally wound on the lining layer, can form good support between the inner wall of the continuous oil pipe and the lining pipe in the processes of filling and solidifying the filling material, ensures that the filling material is uniformly distributed and fully wraps the cable, and improves the overall strength and the service life of the composite continuous oil pipe.
7. The cable provided by the invention is spirally wound on the lining layer, so that the cable is not broken due to torsion, curling and stretching of the coiled tubing in the coiled tubing operation process, and the service life of the composite coiled tubing is longer.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a cross-sectional view of a composite coiled tubing provided by the present invention;
FIG. 2 is a schematic structural view of a cable liner combination provided in accordance with the present invention;
FIG. 3 is a cross-sectional view of the cable liner combination provided by the present invention sleeved into a coiled tubing body;
FIG. 4 is a schematic diagram of the manufacture of a composite coiled tubing provided by the present invention.
Wherein:
1-a coiled tubing body; 2-lining pipe; 3-a cable; 4-a filler material; 5-gas injection pressing cap; 6-locking screw; 7-sealing and pressing the cap; 8-an air injection port; 9-sealing rubber ring; 10-light source or heating rod; 11-supply line.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in 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 of the 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.
Referring to the attached drawing 1, the embodiment of the invention discloses a composite coiled tubing, which comprises a coiled tubing body 1 and a lining tube 2 sleeved in an inner cavity of the coiled tubing body 1; the outer side wall of the lining pipe 2 is wound with a cable 3, the cable 3 is attached and supported between the coiled tubing body 1 and the lining pipe 2, a filling gap is formed between the coiled tubing body 1 and the lining pipe 2, and a filling material 4 is condensed in the filling gap.
In order to further optimize the technical scheme, the coiled tubing body 1 is a coiled tubing for well drilling; the lining pipe 2 is a fiber reinforced hose; the cable 3 is a power supply or communication cable.
In order to further optimize the above technical solution, the number of the cables 3 is multiple, and the cables are wound on the outer side wall of the lining pipe 2 in an equidistant spiral manner.
The manufacturing method of this embodiment is characterized by the selection of the filler, and the filler 4 is a photosensitive resin or a thermosetting resin.
The manufacturing method of the composite continuous oil pipe provided by the embodiment comprises the following steps:
s1, cleaning the inner wall of a coiled tubing body 1;
s2, referring to the attached figure 2, the bonding cable 3 is wound on the outer side of the lining pipe 2 to form a cable lining combination body;
s3, referring to the attached drawing 3, pulling the cable lining combination body into the inner cavity of the continuous oil pipe body 1 through traction of a traction rope, injecting uncured photosensitive resin or thermosetting resin into the filling gap, and discharging gas in the filling gap to form a composite oil pipe combination body;
s4, referring to the attached figure 4, two ends of the composite oil pipe combined body are sealed, a light source or a heating rod 10 is placed in the composite oil pipe combined body, and a power supply line 11 of the light source or the heating rod 10 is led out from one end head of the composite oil pipe combined body;
s5, inflating the inner cavity of the composite oil pipe combination body to enable the lining pipe 2 to keep a circular tensioning state; and dragging the power supply wire 11 at a constant speed to enable the light source or the heating rod 10 to move from one end of the inner cavity of the composite oil pipe combination body to the other end, so as to promote the solidification of the photosensitive resin or the thermosetting resin, and enable the continuous oil pipe body 1, the lining pipe 2, the cable 3 and the photosensitive resin or the thermosetting resin to be solidified into a whole.
The specific method of the step S4 comprises the following steps: turning over two ends of the lining pipe 2 to wrap the outer wall of the end head of the continuous oil pipe body 1, and respectively and hermetically buckling a gas injection pressure cap 5 and a sealing pressure cap 7 at two ends of the composite oil pipe combination, wherein the gas injection pressure cap 5 and the sealing pressure cap 7 are tightly pressed on the outer wall of the continuous oil pipe body 1 through a plurality of locking screws 6 which are radially connected; the gas injection pressure cap 5 is provided with a gas injection port 8 connected with a high-pressure air compressor, the middle part of the sealing pressure cap 7 is provided with an opening, and a sealing rubber ring 9 is embedded, and the power supply line 11 passes through the sealing rubber ring 9 and is sealed by being attached with the sealing rubber ring.
The following needs to be paid attention: when filling with the photosensitive resin, a light source is used to facilitate the reaction; when filling with a thermosetting resin, a heating rod is used to facilitate the reaction.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. The manufacturing method of the composite continuous oil pipe is characterized by comprising the following steps:
s1, winding and bonding a cable (3) on the outer side of an inner liner tube (2) to form a cable liner combination body;
s2, sleeving the cable liner combination into an inner cavity of the coiled tubing body (1), injecting uncured photosensitive resin or thermosetting resin into the filling gap, and discharging gas in the filling gap to form a composite oil tube combination;
s3, plugging two ends of the composite oil pipe combination body, placing a light source or a heating rod (10) inside, and leading a power supply line (11) of the light source or the heating rod (10) out of one end head of the composite oil pipe combination body;
s4, inflating the inner cavity of the composite oil pipe combination body to enable the lining pipe (2) to keep a circular tensioning state; dragging the power supply line (11) at a constant speed to enable the light source or the heating rod (10) to move from one end of the inner cavity of the composite oil pipe combination body to the other end of the inner cavity of the composite oil pipe combination body, and promoting the photosensitive resin or the thermosetting resin to solidify, so that the coiled oil pipe body (1), the lining pipe (2), the cable (3) and the photosensitive resin are solidified into a whole, or the coiled oil pipe body (1), the lining pipe (2), the cable (3) and the thermosetting resin are solidified into a whole.
2. The method for manufacturing a composite coiled tubing according to claim 1, wherein the coiled tubing body (1) is coiled tubing for drilling; the lining pipe (2) is a fiber reinforced hose; the cable (3) is a power supply or communication cable.
3. The method for manufacturing a composite coiled tubing according to claim 1, wherein the number of the cables (3) is multiple and the cables are wound on the outer side wall of the lining tube (2) in an equidistant spiral manner.
4. The method for manufacturing a composite coiled tubing, according to claim 1, is characterized in that the inner wall of the coiled tubing body (1) is cleaned before the operation of step S2.
5. The method for manufacturing a composite coiled tubing according to claim 1, wherein in step S2, the cable-liner combination is pulled into the inner cavity of the coiled tubing body (1) by pulling of a pulling rope.
6. The manufacturing method of the composite coiled tubing according to any one of claims 1 to 5, characterized in that in step S3, both ends of the lining tube (2) are turned outwards to wrap the outer wall of the end of the coiled tubing body (1), and a gas injection gland (5) and a sealing gland (7) are respectively and hermetically fastened at both ends of the composite tubing combination, the gas injection gland (5) is provided with a gas injection port (8) for connecting with a high-pressure air compressor, the sealing gland (7) is provided with an opening at the middle part and is embedded with a sealing rubber ring (9), and the power supply line (11) passes through the sealing rubber ring (9) and is sealed with the sealing rubber ring.
7. The manufacturing method of the composite coiled tubing is characterized in that the gas injection pressure cap (5) and the sealing pressure cap (7) are tightly pressed against the outer wall of the coiled tubing body (1) through a plurality of locking screws (6) which are radially connected.
8. The method of claim 1, wherein a light source promotes the coagulation of the photosensitive resin or a heating rod promotes the coagulation of the thermosetting resin.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210653331.XA CN115059411B (en) | 2022-06-09 | 2022-06-09 | Composite continuous oil pipe and manufacturing method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210653331.XA CN115059411B (en) | 2022-06-09 | 2022-06-09 | Composite continuous oil pipe and manufacturing method |
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| Publication Number | Publication Date |
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| CN115059411A CN115059411A (en) | 2022-09-16 |
| CN115059411B true CN115059411B (en) | 2023-01-17 |
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| CN202210653331.XA Active CN115059411B (en) | 2022-06-09 | 2022-06-09 | Composite continuous oil pipe and manufacturing method |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117803331B (en) * | 2024-02-28 | 2024-05-07 | 华运隆腾机械制造有限公司 | Paraffin-preventing electric heating carbon fiber continuous sucker rod and production equipment thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB565833A (en) * | 1943-04-30 | 1944-11-30 | Phillips & Powis Aircraft Ltd | Improvements in flexible ducts and in the production thereof |
| CN104613243A (en) * | 2014-12-01 | 2015-05-13 | 武汉理工大学 | Resin matrix composite interlayer structural tube and synchronous winding manufacturing method thereof |
| CN108317306A (en) * | 2018-04-11 | 2018-07-24 | 威海鸿通管材股份有限公司 | Nonmetallic cabling coiled tubing |
| CN207895131U (en) * | 2018-03-22 | 2018-09-21 | 烽火通信科技股份有限公司 | Layer-stranding cable |
| CN211699754U (en) * | 2019-09-12 | 2020-10-16 | 天津大泛华石油科技有限公司 | Continuous composite pipe cable |
| CN114198029A (en) * | 2022-01-19 | 2022-03-18 | 陕西欣欣智能管业有限公司 | Multifunctional composite continuous oil pipe |
-
2022
- 2022-06-09 CN CN202210653331.XA patent/CN115059411B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB565833A (en) * | 1943-04-30 | 1944-11-30 | Phillips & Powis Aircraft Ltd | Improvements in flexible ducts and in the production thereof |
| CN104613243A (en) * | 2014-12-01 | 2015-05-13 | 武汉理工大学 | Resin matrix composite interlayer structural tube and synchronous winding manufacturing method thereof |
| CN207895131U (en) * | 2018-03-22 | 2018-09-21 | 烽火通信科技股份有限公司 | Layer-stranding cable |
| CN108317306A (en) * | 2018-04-11 | 2018-07-24 | 威海鸿通管材股份有限公司 | Nonmetallic cabling coiled tubing |
| CN211699754U (en) * | 2019-09-12 | 2020-10-16 | 天津大泛华石油科技有限公司 | Continuous composite pipe cable |
| CN114198029A (en) * | 2022-01-19 | 2022-03-18 | 陕西欣欣智能管业有限公司 | Multifunctional composite continuous oil pipe |
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| CN115059411A (en) | 2022-09-16 |
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