GB2588954A - Inner pipe centraliser for double wall pipe - Google Patents

Inner pipe centraliser for double wall pipe Download PDF

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Publication number
GB2588954A
GB2588954A GB1916664.4A GB201916664A GB2588954A GB 2588954 A GB2588954 A GB 2588954A GB 201916664 A GB201916664 A GB 201916664A GB 2588954 A GB2588954 A GB 2588954A
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GB
United Kingdom
Prior art keywords
pipe
inner pipe
double wall
slide bearings
centraliser
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
GB1916664.4A
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GB201916664D0 (en
Inventor
Underwood Chris
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Af Pipe Solutions Ivs
Original Assignee
Af Pipe Solutions Ivs
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Af Pipe Solutions Ivs filed Critical Af Pipe Solutions Ivs
Priority to GB1916664.4A priority Critical patent/GB2588954A/en
Publication of GB201916664D0 publication Critical patent/GB201916664D0/en
Priority to PCT/EP2020/082024 priority patent/WO2021094514A1/en
Publication of GB2588954A publication Critical patent/GB2588954A/en
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L9/00—Rigid pipes
    • F16L9/18—Double-walled pipes; Multi-channel pipes or pipe assemblies
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK 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
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK 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
    • E21B17/1078—Stabilisers or centralisers for casing, tubing or drill pipes

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Fluid Mechanics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Quick-Acting Or Multi-Walled Pipe Joints (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)

Abstract

An inner pipe centraliser assembly for a double wall pipe, comprising a plurality of spring forms and attachment means for fixedly securing the plurality of spring forms to an inner pipe of a double wall pipe. Each spring form comprises: one or more inner slide bearings configured to be biased against an outer surface of the inner pipe, wherein the one or more inner side bearings are configured to be slideable along the outer surface of the inner pipe in an axial direction, and one or more outer slide bearings configured to be biased against an inner surface of an outer pipe of the double wall pipe, wherien the one or more outer slide bearings are configured to be slideable along the inner surface of the outer pipe in the axial direction; wherein the one or more inner slide bearings and the one or more outer slide bearings of each spring form are offset from one another in the axial direction and a radial direction of the double wall pipe; and wherein each spring form is compressible in a radial direction which causes the particular spring form to extend in the axial direction.

Description

Inner Pipe Centraliser for Double Wall Pipe
Technical Field
The invention relates particularly, but not exclusively, to double wall pipes and inner pipe centralisers for double wall pipes.
Background
Double wall pipe installations are commonly used in many areas of industry. Such pipes can facilitate leak detection for potentially hazardous materials, as well as providing protection for an inner pipe of the double wall pipe. Accordingly, double wall pipes are sometimes exposed to a wide range of conditions which, for example, can cause thermal expansion or contraction.
In order to implement double wall pipe, centralisers are sometimes used in order to keep the inner pipe approximately central within an outer pipe of the double wall pipe. However, traditional centralisers often do not account for resultant forces from thermal expansion or contraction. Accordingly, cracks can form at the fixture locations, where the centraliser is fixed to the pipe(s).
Furthermore, traditional centralisers which do compensate to some degree for thermal expansion or contraction are often made very flexible, allowing a large degree of movement between the pipes. The subsequent vibration can then cause structural damages in the piping itself.
However, the present inventors have identified an improved apparatus that relates to a double wall pipe centraliser for an inner pipe to support the inner pipe within an outer pipe, in the case of the inner pipe or outer pipe moving radially or axially relative to one another.
Summary of the Invention
Aspects of the invention are set out in the accompanying claims.
In a first aspect of the invention there is provided an inner pipe centraliser assembly for a double wall pipe, the inner pipe centraliser assembly comprising: a plurality of spring forms; and attachment means for fixedly securing the plurality of spring forms to an inner pipe of a double wall pipe.
Each spring form of the plurality of spring forms comprises: one or more inner slide bearings configured to be biased against an outer surface of the inner pipe, wherein the one or more inner slide bearings are configured to be slideable along the outer surface of the inner pipe in an axial direction, and one or more outer slide bearings configured to be biased against an inner surface of an outer pipe of the double wall pipe, wherein the one or more outer slide bearings are configured to be slideable along the inner surface of the outer pipe in the axial direction.
The one or more inner slide bearings and the one or more outer slide bearings of each spring form are offset from one another in the axial direction and a radial direction of the of the double wall pipe; and wherein each spring form is compressible in a radial direction, and radial compression of a particular spring form causes the particular spring form to extend in the axial direction.
Thus, according to the invention an inner pipe centraliser assembly capable of maintaining an inner pipe of a double wall pipe in a substantially central position within the outer pipe of the double wall pipe is provided.
Maintaining the inner pipe in a substantially central position within the outer pipe comprises avoiding permanent displacement of the inner with respect to the outer pipe (or vice versa) such that a central axis of the inner pipe is aligned to a central axis of the outer pipe. That is, in response to a displacement of the axis of the inner pipe relative to the axis of the outer pipe, the spring forms provide a restoring force on the inner pipe. Accordingly, the spring forms act to realign the axes of the two pipes.
The inner pipe centraliser assembly of the present invention is capable of maintaining (and restoring) this alignment of the central axes of the inner and outer pipes even when one or both of the pipes are thermally expanded or contracted by allowing axial displacement of the inner pipe with respect to the outer pipe (as vice versa). Furthermore, the inner pipe centraliser assembly of the present invention allows the inner pipe to remain centralised despite external contact forces.
The inner pipe centraliser assembly is configured to fixedly secured to the inner pipe centraliser assembly such that the inner piper centraliser assembly is not moveable relative to the inner pipe. Such a fixedly secure connection may, however, be a removable connection to allow removal of the inner pipe centraliser assembly and subsequent reuse in other double wall pipes. Furthermore, the inner and outer slide bearings are slideable along the surfaces of the inner and outer pipes respectively such that the inner and outer slide bearings are moveable with respect to the inner and outer pipes respectively while remaining biased against the inner and outer pipes respectively.
The plurality of spring forms may be generally sinusoidal in shape, with a 'peak' of the spring form comprising an outer slide bearing, and a 'trough' of the spring form comprising an inner slide bearing. The spring form may also be fixedly secured to the inner pipe at a 'trough' of the spring form. The spring forms may, as an example, be formed from a spring steel material. The spring steel may be ferritic or austenitic, or a mixture of the two.
The spring forms may be integrally formed with the attachment means or may be attached to the attachment means via a number of possible mechanisms, such as screws, glue or any other suitable means.
Each spring form is compressible in a radial direction. For example, an external force on the outer pipe causes a displacement of the central axis of the outer pipe relative to the inner pipe and a radial compression of the spring forms in order to facilitate this displacement.
During such a radial compression, particular outer slide bearings move closer to the inner pipe while remaining in contact with the outer pipe. Furthermore, on an opposite side of the inner pipe, other particular outer slide bearings move further away from the inner pipe while remaining in contact with the outer pipe.
Furthermore, each spring form is configured to extend in an axial direction when compressed radially. This elastic deformation helps to provide a restoring force on the inner and outer pipes to as to realign the axes of the pipes.
The inner and outer slide bearing may each be provided with one or more contact surfaces to prevent direct contact between the spring forms and the surfaces of the pipes, reducing wear while still allowing the slide bearings to slide along the surfaces of the respective pipes. These contact surfaces may be curved to increase the contact surface area when biased against the respective pipes.
The slide bearings may be formed from a plastic material, for example polyether ether ketone (PEEK). The PEEK material may, in some examples, be mixed with other materials. As one example, the slide bearings may be formed from PEEK mixed with graphite and polytetrafluoroethylene (PTFE), as this combination is suitable for use with cryogenic liquids.
Advantageously, the inner pipe centraliser assembly may not be fixed to the outer pipe of the double wall pipe. Rather, the inner pipe centraliser assembly is configured to contact the outer pipe only via the one or more outer slide bearings. Accordingly, the inner pipe centraliser assembly, and hence the inner pipe, is able to be axially displaced relative to the outer pipe. As such, thermal expansion or contraction in one or more of the pipes can be compensated for. This prevents cracks (or any other form of damage) forming in the pipes due to fixtures of the inner pipe centraliser assembly.
Advantageously, the plurality of spring forms may be equally spaced in a circumferential direction of the double wall pipe. In such an arrangement, the spring forms may each have equal spring stiffness.
Alternatively, however, spring forms may be provided in different arrangements. In such arrangements, the net force applied to the inner pipe by the inner pipe centraliser assembly may be zero, or for example, could be non-zero to compensate for an external force (such as gravity or a man-made force). Furthermore, even in symmetric arrangements, the spring forms may have different spring stiffness and thus produces a different restoring force on the pipes.
As an example, a spring form may have a spring stiffness of between 100 N/mm and 500 N/mm, or, in some examples, between 200 N/mm and 400 N/mm, or, in further examples, between 250 N/mm and 350 N/mm.
In some aspects, the inner pipe centraliser may comprise four spring forms spaced 90 degrees apart from one another in the circumferential direction. This arrangement allows restoring forces to be independently applied in orthogonal directions while minimising the number of spring forms to reduce constructions complexity. As an alternative, the inner pipe centraliser may comprise three spring forms spaced 120 degrees apart from one another in the circumferential direction. According to some aspects, the attachment means may comprise a strap. The strap may pass around an outer circumference of the inner pipe to fixedly secure the inner pipe centraliser assembly to the inner pipe. The use of a strap to fixedly secure the inner pipe centraliser assembly to the inner pipe allows the inner pipe centraliser assembly to be easily removed from the inner pipe and/or moved along the pipe. Furthermore, the strap allows the inner pipe centraliser assembly to be useable for different diameter inner pipes as the tightness of the strap may be adjustable.
The strap may be elastic in nature, with an unstretched diameter less than a diameter of the inner pipe to which the inner pipe centraliser assembly is to be secured. Alternatively, the strap need not be elastic and could be secured to the inner pipe through various other means, for example a ratchet strap or similar. As an example, the strap may be made of a metal material. Alternatively, the strap could be made of a polymer material, such as nylon, or any other suitable material. Other attachment means, such as screws and/or bolts are also possible.
Furthermore, the attachment means may further comprise a bolted connection for fixedly securing the inner pipe centraliser assembly to the inner pipe of a double wall pipe via the strap. This arrangement allows the strap to be tightly fastened to the inner pipe so as to fixedly secure the inner pipe centraliser assembly to the inner pipe, whilst at the same time being easily removable.
The bolted connection may comprise two or more integrally formed bolt mounts configured to receive two or more bolts. The two or more bolts may be received by the bolt mounts via threaded connections. Each bolt is arranged to pass through a loop of the strap and therefore secure the strap to the bolt mounts. This in turn secures the inner pipe centraliser assembly to the inner pipe.
Advantageously in some aspects, the inner pipe centraliser may be integrally formed with the inner pipe. This may be achieved through various means such as welding or 3D printing. This can provide a more secure fixing of the inner pipe centraliser assembly to the inner pipe to prevent any sliding of the inner pipe centraliser assembly relative to the inner pipe.
According to a second aspect of the invention, there is provided a method of installing an inner pipe centraliser assembly as described herein, the method comprising: fixedly securing the attachment means to an outer wall of an inner pipe of a double wall pipe, wherein the one or more inner slide bearings of each spring form are biased against an outer surface of the inner pipe. The method further comprises exerting a radially compressive force against the one or more outer slide bearings to compress the plurality of spring forms in a radial direction; sliding the inner pipe centraliser assembly and inner pipe into an inner cavity of an outer pipe of the double wall pipe; and removing the radially compressive force against the one or more outer slide bearings to cause the one or more outer slide bearings to be biased against an inner surface of the outer pipe.
Thus, according to this aspect of the invention, an inner pipe centraliser assembly may be installed in a double wall pipe. Accordingly, the inner pipe centraliser assembly may maintain and restore alignment of the central axes of the inner and outer pipes of the double wall pipe. This installation method further allows the inner pipe centraliser to be easily removable such that the inner pipe centraliser may be re-used in other double wall pipes.
According to a third aspect of the invention there is provided a double wall pipe comprising: an inner pipe; an outer pipe; and the inner pipe centraliser assembly as described herein.
Multiple inner pipe centraliser assemblies as described herein could be provided along the length of a double wall pipe in order to maximise the aforementioned benefits to the double wall pipe along the pipe's length.
Brief Description of the Drawings
Figure 1 shows an inner pipe centraliser assembly.
Figure 2 shows a spring form as included in the inner pipe centraliser assembly shown in Figure 1. Figure 3 shows the inner pipe centraliser assembly of Figure 1 mounted in a double wall pipe.
Any reference to prior art documents in this specification is not to be considered an admission that such prior art is widely known or forms part of the common general knowledge in the field.
As used in this specification, the words "comprises", "comprising", and similar words, are not to be interpreted in an exclusive or exhaustive sense. In other words, they are intended to mean "including, but not limited to".
The invention is further described with reference to the following examples. It will be appreciated that the invention as claimed is not intended to be limited in any way by these examples. It will be further recognised that the skilled reader will understand from the teaching herein that integers and features of different embodiments may be used in any suitable and advantageous combination.
Detailed Description
Figure 1 illustrates a fully assembled inner pipe centraliser assembly 100 according to an example teaching of the disclosure. As shown, the inner pipe centraliser assembly includes a plurality of spring forms 110. In the present example, the inner pipe centraliser assembly includes four spring forms 110 spaced 90 degrees apart in a circumferential direction, however different numbers of spring forms and different spacings could be utilised.
The inner pipe centraliser assembly 100 of the present example further includes an attachment means 120 for fixedly securing the plurality of spring forms to an inner pipe of a double wall pipe. In the present example, the attachment means 120 includes a strap and a bolted connection 125 to secure the strap 120 to the inner pipe, however other attachment means are possible. The strap has an inner diameter greater than an outer diameter of the inner pipe of the double wall pipe to which the inner pipe centraliser assembly is secured. In the present example, the strap 120 is metal, however the strap 120 could be made from other materials.
As shown, each spring form is attached to the strap 120 and thus by fixedly securing the strap 120 to the inner pipe, the spring forms 110 are themselves fixedly secured to the inner pipe. The bolted connection can also be readily unfastened such that the strap 120, and hence the entire inner pipe centraliser assembly 100, can be removed from the inner pipe.
Each spring form 110 of the inner pipe centraliser assembly 100 comprises one or more outer slide bearings 111 and one or more inner slide bearings 112. The spring form 110 is configured such that, once the inner pipe centraliser assembly 100 has been installed in a double wall pipe, the outer pipe centralisers 111 are biased against an inner surface of an outer pipe of the double wall pipe. Similarly, the spring form 110 is configured such that, once the inner pipe centraliser assembly 100 has been installed in a double wall pipe, the inner pipe centralisers 112 are biased against an outer surface of the inner pipe of the double wall pipe.
Furthermore, the outer slide bearings 111 and inner slide bearings 112 are configured to be slideable along a surface of the respective pipes against which the bearings are biased. That is, the outer slide bearings 111 are configured to be slideable along the inner surface of the outer pipe in the axial direction and the inner slide bearings 112 are configured to be slideable along the outer surface of the inner pipe in an axial direction.
To increase the degree to which the inner slide bearings 111 and outer slide bearings 112 can slide, the slide bearings may be provided with contact surfaces which are configured to contact the surface of the respective pipes, once installed.
As shown, the inner slide bearings 112 and the outer slide bearings 111 of each spring form 110 are offset from one another in both the axial direction and a radial direction of the of the double wall pipe.
Furthermore, each spring form 110 is compressible in a radial direction, and radial compression of a particular spring form 110 causes the particular spring form 110 to extend in the axial direction.
Figure 2 illustrates a spring form 110 as included in the inner pipe centraliser assembly 100 shown in Figure 1. As shown, the spring form 110 of this example has a generally sinusoidal shape. Outer slide bearings 111 are provided on 'peaks' of the spring form 110 (though not necessarily all peaks of the spring form) and inner slide bearings 112 are provided on 'troughs' of the spring form 110 (though not necessarily all troughs of the spring form). In the present example, the spring forms 110 are fixed to the attachment means 120 at a trough of the spring form 110, shown in Figure 2 as the trough region in which no slide bearing is provided. However the spring form 110 could be fixed to the attachment means 120 at a different region of the spring form 110.
In the present example, the spring form 110 extends from two sides of the portion where the spring form is fixed to the strap 120, however the spring form may instead extend from only one side of the strap.
Furthermore, while the spring form 110 shown includes only one peak (and outer slide bearing 111) either side of the portion where the spring form is fixed to the strap 120, the spring form 110 could include two or more peaks (and outer slide bearings 111) either side of the portion where the spring form is fixed to the strap 120. Similarly, while the spring form 110 shown includes only one trough (and inner slide bearing 112) either side of the portion where the spring form is fixed to the strap 120, the spring form 110 could include two or more troughs (and inner slide bearings 112) either side of the portion where the spring form is fixed to the strap 120. In addition, the number of peaks and troughs (and the number of outer slide bearings 111 and inner slide bearings 112) need not be symmetric either side of the portion where the spring form is fixed to the strap 120. Moreover, the number of peaks need not equal the number of troughs and the number of outer slide bearings 111 need not equal the number of inner slide bearings 112.
In this example, the outer slide bearings 111 are curved in such a way that when mounted within a double wall pipe they make full contact with the inner surface of the outer pipe, and the two inner slide bearings 112 are curved in such a way that when mounted they make full contact with the outer surface of the inner pipe.
Figure 3 illustrates a double wall pipe 200 with the inner pipe centraliser assembly 100 shown in Figure 1 installed therein. The inner pipe centraliser assembly 100 is fixedly secured to the inner pipe 220 of the double wall pipe 200.
In order to install the inner pipe centraliser assembly 110 of the present example, the inner pipe centraliser assembly 110 is placed over the inner pipe 220 and slid into a desired position. The strap 120 is then fastened together using the bolted connection 125, with the two bolts fed through two bolt mounts fastened on each end, by means of a threaded connection. The strap 120 is therefore pulled together over the inner pipe 220, thereby fixing the inner pipe centraliser assembly 100 in position around the inner pipe 220.
The outer slide bearings 111 are then radially compressed, thereby causing radial compression of the spring forms 110. The inner pipe, with the inner pipe centraliser assembly 110 secured thereto, is slid into the outer pipe 210, or vice versa. The outer slide bearings 111 are then released, with the spring force of the spring forms 110 pushing the outer slide bearings 111 onto the inner surface of the outer pipe 210 and the inner slide bearings 112 onto the outer surface of the inner pipe 220. Accordingly, the inner pipe 220 is centralised within the outer pipe 210 due to the spring force provided by the spring forms 110.
Once installed, the centraliser remains fixed onto the inner pipe 220 by means of the strap 120 and bolted connection 125, but is free to slide in the axial direction relative to the outer pipe 210 on the outer slide bearings 111. The inner pipe centraliser assembly 100 may also deflect radially using the spring forms 110, for example in response to an external force or depending on the expansion or contraction movements of the inner 220 or outer pipe 210. The amount of radial deflection is determined by the spring stiffness of the spring forms 110 in the direction of the radial force.
Therefore, according to this example, there is provided a unique solution allowing for free and continuous movement of an inner pipe 220 of a double wall pipe 200 within an outer pipe 210 of the double wall pipe 200, whilst being sufficiently supported by the assembly of spring forms 110 and slide bearings.

Claims (9)

  1. Claims 1. An inner pipe centraliser assembly for a double wall pipe, the inner pipe centraliser assembly comprising: a plurality of spring forms; and attachment means for fixedly securing the plurality of spring forms to an inner pipe of a double wall pipe; wherein each spring form of the plurality of spring forms comprises: one or more inner slide bearings configured to be biased against an outer surface of the inner pipe, wherein the one or more inner slide bearings are configured to be slideable along the outer surface of the inner pipe in an axial direction, and one or more outer slide bearings configured to be biased against an inner surface of an outer pipe of the double wall pipe, wherein the one or more outer slide bearings are configured to be slideable along the inner surface of the outer pipe in the axial direction; wherein the one or more inner slide bearings and the one or more outer slide bearings of each spring form are offset from one another in the axial direction and a radial direction of the double wall pipe; and wherein each spring form is compressible in a radial direction, and radial compression of a particular spring form causes the particular spring form to extend in the axial direction.
  2. 2. The inner pipe centraliser assembly of claim 1, wherein the inner pipe centraliser assembly is not fixedly secured to the outer pipe of the double wall pipe.
  3. 3. The inner pipe centraliser assembly of claim 1 or claim 2, wherein the plurality of spring forms are equally spaced in a circumferential direction of the double wall pipe.
  4. 4. The inner pipe centraliser assembly of claim 3, comprising four spring forms spaced 90 degrees apart from one another in the circumferential direction.
  5. 5. The inner pipe centraliser assembly of any preceding claim, wherein the attachment means comprises a strap.
  6. 6. The inner pipe centraliser assembly of claim 5, wherein the attachment means further comprises a bolted connection for fixedly securing the inner pipe centraliser assembly to the inner pipe of a double wall pipe via the strap.
  7. 7. The inner pipe centraliser assembly of any of claims 1-4, wherein the inner pipe centraliser is integrally formed with the inner pipe.
  8. 8. A double wall pipe comprising: an inner pipe; an outer pipe; and the inner pipe centraliser assembly of any of claims 1-7.
  9. 9. A method of installing an inner pipe centraliser assembly according to any of claims 1-7, the method comprising: fixedly securing the attachment means to an outer wall of an inner pipe of a double wall pipe, wherein the one or more inner slide bearings of each spring form are biased against an outer surface of the inner pipe; exerting a radially compressive force against the one or more outer slide bearings to compress the plurality of spring forms in a radial direction; sliding the inner pipe centraliser assembly and inner pipe into an inner cavity of an outer pipe of the double wall pipe; and removing the radially compressive force against the one or more outer slide bearings to cause the one or more outer slide bearings to be biased against an inner surface of the outer pipe.
GB1916664.4A 2019-11-15 2019-11-15 Inner pipe centraliser for double wall pipe Pending GB2588954A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB1916664.4A GB2588954A (en) 2019-11-15 2019-11-15 Inner pipe centraliser for double wall pipe
PCT/EP2020/082024 WO2021094514A1 (en) 2019-11-15 2020-11-13 Inner pipe centraliser for double wall pipe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1916664.4A GB2588954A (en) 2019-11-15 2019-11-15 Inner pipe centraliser for double wall pipe

Publications (2)

Publication Number Publication Date
GB201916664D0 GB201916664D0 (en) 2020-01-01
GB2588954A true GB2588954A (en) 2021-05-19

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ID=69063147

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1916664.4A Pending GB2588954A (en) 2019-11-15 2019-11-15 Inner pipe centraliser for double wall pipe

Country Status (2)

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GB (1) GB2588954A (en)
WO (1) WO2021094514A1 (en)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3556042A (en) * 1966-08-16 1971-01-19 Mark Tool Co Inc Centering device
US3643739A (en) * 1966-09-06 1972-02-22 Weatherford Oil Tool Co Inc Centralizer
US4786088A (en) * 1987-06-25 1988-11-22 Asahi/America, Inc. Double-containment thermoplastic pipe assembly
US6102118A (en) * 1998-12-30 2000-08-15 Moore; Curt A. Multi-purpose adjustable centralizer system with tool
EP1979664A1 (en) * 2006-01-23 2008-10-15 Straub Werke AG Clamp for high-pressure tubes
US20080283253A1 (en) * 2007-05-16 2008-11-20 Frank's International, Inc. Expandable Centralizer For Expandable Pipe String
CN206655667U (en) * 2017-04-18 2017-11-21 天津山远石油工具有限公司 A kind of novel weaved formula elastic centralizer

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3556042A (en) * 1966-08-16 1971-01-19 Mark Tool Co Inc Centering device
US3643739A (en) * 1966-09-06 1972-02-22 Weatherford Oil Tool Co Inc Centralizer
US4786088A (en) * 1987-06-25 1988-11-22 Asahi/America, Inc. Double-containment thermoplastic pipe assembly
US6102118A (en) * 1998-12-30 2000-08-15 Moore; Curt A. Multi-purpose adjustable centralizer system with tool
EP1979664A1 (en) * 2006-01-23 2008-10-15 Straub Werke AG Clamp for high-pressure tubes
US20080283253A1 (en) * 2007-05-16 2008-11-20 Frank's International, Inc. Expandable Centralizer For Expandable Pipe String
CN206655667U (en) * 2017-04-18 2017-11-21 天津山远石油工具有限公司 A kind of novel weaved formula elastic centralizer

Also Published As

Publication number Publication date
GB201916664D0 (en) 2020-01-01
WO2021094514A1 (en) 2021-05-20

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