WO2013107726A2 - An apparatus for treating the inner surface of a cylindrical element - Google Patents

An apparatus for treating the inner surface of a cylindrical element Download PDF

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Publication number
WO2013107726A2
WO2013107726A2 PCT/EP2013/050644 EP2013050644W WO2013107726A2 WO 2013107726 A2 WO2013107726 A2 WO 2013107726A2 EP 2013050644 W EP2013050644 W EP 2013050644W WO 2013107726 A2 WO2013107726 A2 WO 2013107726A2
Authority
WO
WIPO (PCT)
Prior art keywords
tool
cylindrical element
inspection apparatus
tool carrier
control means
Prior art date
Application number
PCT/EP2013/050644
Other languages
French (fr)
Other versions
WO2013107726A3 (en
Inventor
John Arne Thomassen
Original Assignee
Aker Mh As
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 Aker Mh As filed Critical Aker Mh As
Publication of WO2013107726A2 publication Critical patent/WO2013107726A2/en
Publication of WO2013107726A3 publication Critical patent/WO2013107726A3/en

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Classifications

    • 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
    • E21B17/006—Accessories for drilling pipes, e.g. cleaners
    • 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
    • E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
    • E21B19/002—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables specially adapted for underwater drilling

Definitions

  • the invention relates to devices for treating and/or inspecting inner surfaces of tubular elements, as specified in the preamble of claim 1.
  • tensioner systems In the offshore petroleum industry it is well known to use tensioner systems on floating drilling rigs and other vessels, in order to maintain a pre-selected vertical tension in a marine riser extending from the rig and down to a subsea wellhead. When the vessel is heaving and rolling due to waves, currents and winds, the tensioner system will try to keep constant tension in the riser.
  • DAT direct acting tensioner
  • accumulators are known to occur during use.
  • the deformations may be caused by a number of factors, e.g. external mechanical impact loads (caused by e.g. collisions with other equipment) and internal wear and tear. More often than not, such deformations compromise the functionality of the DAT system (e.g. by causing leakage between piston and cylinder wall) and must hence be repaired.
  • a commonly known method of repairing such inner wall deformations is to dismantle the cylinder and take it to a workshop for grinding away the damaged areas on the internal wall.
  • the removal of a tensioner cylinder may involve shipment to an onshore facility. This implies considerable complications, as well as costs and loss of time.
  • an apparatus for treating and/or inspecting an inner surface of a cylindrical element characterized by a tool carrier having a main body and a support body and being connected to a tool carrier manoeuvring element, wherein the tool carrier is configured for supporting a tool or inspection apparatus, and the manoeuvring element further comprises control means for operating the tool or inspection apparatus.
  • the main body and support body comprises support elements for supporting the tool carrier against an inner surface of the cylindrical element.
  • the support elements are arranged so as to define an inscribed circle inside the cylindrical element inner circumference.
  • the tool or inspection apparatus is supported by a movable element which is configured for moving the tool or inspection apparatus between a non-engaging position with respect to the inner surface, and an operating position in which the tool or inspection apparatus is operable to treat or inspect the inner surface.
  • the tool or inspection apparatus comprises a grinder having a motor and grinding disk configured and arranged for grinding and/or polishing selected regions of the cylindrical element inner surface.
  • the motor axis is arranged at an angle different from with respect to the longitudinal axis of the cylindrical element.
  • the manoeuvring element comprises in one embodiment a telescoping rod extendable to a position outside the cylindrical element, and the control means comprise a handle bar connected to the telescoping rod free end.
  • the control means comprises a speed control means and control means for moving the tool or inspection apparatus between a non-engaging position and the operating position.
  • the main body and the support body preferably comprise an engineering
  • thermoplastic material such as polyoxymethylene.
  • the support body is adjustable and/or releasable with respect to the main body, such that the tool carrier circumference may be adjusted to suit the inner circumference of the cylindrical element.
  • the tool or inspection apparatus may be any one of the items of the group comprising a grinder, a polishing device, a welding apparatus, a measurement tool, an inspection tool, a gauge.
  • the invented apparatus is particularly suited for treating, monitoring and gauging the internal surfaces of tubular objects, including but not necessarily limited to mending structural damage, removing impurities and/or plaque, welding, grinding, inspecting, and measuring such parameters as internal diameter and eccentricity.
  • the invented apparatus uses the cylindrical wall as a guide for axial movement of the tool carrier.
  • Figure 1 is a perspective drawing of a DAT system on a floating drilling rig
  • Figure 2 is a perspective drawing of an embodiment of the apparatus according to the invention.
  • Figure 3 is a perspective drawing of the telescopic rod and the control handle
  • Figure 4 is a perspective view of a part of the tool carrier, illustrating in particular the tool unit;
  • Figure 5 and figure 6 are two different perspective views of the tool carrier
  • Figure 7 is an end view of the tool carrier, and illustrates the tool carrier as seen in the longitudinal direction of the telescopic rod;
  • Figure 8 is a side view of the tool carrier.
  • Figure 1 illustrates a DAT system 1 comprising a number of hydraulic-pneumatic cylinders 2 suspended in a circle-symmetrical configuration. Cylinder rods 5 are connected to a tensioner ring 6, which in turn is connected to a riser 8. In figure 1, the cylinder rods are shown in a partly extended state.
  • FIG 2. An embodiment of the invented apparatus is shown in figure 2.
  • the apparatus basically comprises a tool carrier 3, which carries a tool 12 and is connected to a control handle 4 via a telescopic rod 7.
  • an inner telescoping rod 7a is connected to the tool carrier 3 via a flange 16 and associated bolts (not shown).
  • the control handle 4 is connected to an outer telescoping rod 7b, and the inner rod 7a fits telescopingly into the (hollow) outer rod 7b, in a known manner.
  • the control handle 4, designed to be held by a human operator, is furnished with first and second control switches 14, 15 for controlling the tool 12.
  • the tool carrier 3 comprises a main body 3a and a support 3b.
  • the material in the main body and the support is preferably a light-weight, high precision material, with high stiffness, low friction and a high degree of dimensional stability, preferably an engineering thermoplastic such as polyoxymethylene (commonly referred to as POM and also known as acetal, polyacetal or polyformaldehyde).
  • POM polyoxymethylene
  • the grinder unit 12 Arranged on the forward end of the tool carrier is a tool 12, in the illustrated embodiment a grinder unit 12.
  • the grinder unit 12 comprises a motor 18 and a grinding disk 19, connected to the motor via a chuck 20, in a manner which is well known in the art.
  • the motor (which may be electrical or pneumatic) is controlled by the control switch 14.
  • the grinder unit 12 is connected to a bracket 21 on the housing via a slidable element 22, whereby the grinding disk 19 may be moved into contact with the cylinder interior wall, and thus grind the wall surface.
  • the sliding movement, between an operating (grinding) position and a non-operating position, is performed by known means, e.g. by a pneumatic motor (not shown), controlled by the control switch 15.
  • the slidable element 22 is furnished with a micrometer screw or similar device (indicated schematically with reference number 23), whereby minute and precise adjustments may be made.
  • the grinding disk is tilted at an angle a with respect to the longitudinal axis z-z (see figure 8).
  • the face of the grinding disk exhibits a shallow angle a with respect to the cylinder interior wall, whereby the grinding face contact area on the wall surface may be better controlled.
  • the grinder tilt is accomplished by a skew mounting plate 24 between the grinder unit 12 and the slidable element 22.
  • the grinding disk may be moved into and out of contact with the interior wall surface, and thus grind the surface at the desired spots.
  • the tool carrier 3 is furnished with rollers 25 arranged at regular intervals around the tool carrier periphery.
  • the rollers are supported in socket and spring loaded, and configured for interaction with the interior wall and thus serve to support the tool carrier inside the cylinder.
  • the spring loaded rollers serve to stabilise the tool carrier against the tubular surface.
  • the rollers are preferably of a material similar to that of the wall surface. In the illustrated embodiment, two pairs of rollers are arranged on the y-shaped main body 3a, and one pair of rollers is arranged on the support 3b.
  • the support 3b is connected to the main body 3a at a junction 3c.
  • the radial dimension of the support 3b may be varied, and/or the support may be exchanged with supports having smaller or larger dimensions, in order to allow the tool carrier to fit inside a given cylinder circumference C (see figure 7).
  • the support may also comprise adjustment means (not shown), enabling a radial movement as indicated by the double arrow M in figure 7. The tool carrier 3 radial dimension may thus adjusted to suit the applicable cylinder dimension.
  • the grinder unit may be powered by external sources, via a cables (not shown), or may have built-in power sources in the form of battery packs, etc. (not shown).
  • the grinder motor 18 may be a pneumatic motor, connected to a distal pressurized air supply via an air hose (not shown).
  • the tool carrier is also advantageously equipped with a light source 26 and a camera 27 for illuminating a and inspecting the surface to be cleaned.
  • the tool may be replaced by, or augmented by, other tools such as a welding tool, gauges and measurement instruments.
  • the invention has been described with a grinder unit, it should be understood that the grinder unit may be replaced by any tool, inspection unit or measuring unit. Examples of such tools are polisher, mechanical and/or optical gauge, welding apparatus, detergent spray nozzle.

Abstract

An apparatus for treating and/or inspecting an inner surface of a cylindrical element (2) comprises a tool carrier (3) having a main body (3a) and a support body (3b) and being connected to a tool carrier manoeuvring element (7). The tool carrier is configured for supporting a tool or inspection apparatus (12), and the manoeuvring element further comprises control means (4) for operating the tool or inspection apparatus.

Description

An apparatus for treating the inner surface of a cylindrical element Field of the invention
The invention relates to devices for treating and/or inspecting inner surfaces of tubular elements, as specified in the preamble of claim 1.
Background of the invention
In the offshore petroleum industry it is well known to use tensioner systems on floating drilling rigs and other vessels, in order to maintain a pre-selected vertical tension in a marine riser extending from the rig and down to a subsea wellhead. When the vessel is heaving and rolling due to waves, currents and winds, the tensioner system will try to keep constant tension in the riser.
One type of tensioner system that is well known in the art, is termed a "direct acting tensioner" (DAT) system, having a number of hydraulic-pneumatic cylinders suspended underneath the drill floor or in a designed frame above the lower deck.
Localized deformations on the internal walls of DAT cylinders, as well as the
accumulators, are known to occur during use. The deformations may be caused by a number of factors, e.g. external mechanical impact loads (caused by e.g. collisions with other equipment) and internal wear and tear. More often than not, such deformations compromise the functionality of the DAT system (e.g. by causing leakage between piston and cylinder wall) and must hence be repaired.
A commonly known method of repairing such inner wall deformations is to dismantle the cylinder and take it to a workshop for grinding away the damaged areas on the internal wall. In the case of a floating drilling rig, the removal of a tensioner cylinder may involve shipment to an onshore facility. This implies considerable complications, as well as costs and loss of time.
The present applicant has devised and embodied this invention to overcome the shortcomings of the prior art and to obtain further advantages.
Summary of the invention
The invention is set forth and characterized in the main claim, while the dependent claims describe other characteristics of the invention.
It is thus provided an apparatus for treating and/or inspecting an inner surface of a cylindrical element, characterized by a tool carrier having a main body and a support body and being connected to a tool carrier manoeuvring element, wherein the tool carrier is configured for supporting a tool or inspection apparatus, and the manoeuvring element further comprises control means for operating the tool or inspection apparatus.
In one embodiment, the main body and support body comprises support elements for supporting the tool carrier against an inner surface of the cylindrical element. The support elements are arranged so as to define an inscribed circle inside the cylindrical element inner circumference.
In one embodiment, the tool or inspection apparatus is supported by a movable element which is configured for moving the tool or inspection apparatus between a non-engaging position with respect to the inner surface, and an operating position in which the tool or inspection apparatus is operable to treat or inspect the inner surface.
In one embodiment, the tool or inspection apparatus comprises a grinder having a motor and grinding disk configured and arranged for grinding and/or polishing selected regions of the cylindrical element inner surface.
In one embodiment, the motor axis is arranged at an angle different from with respect to the longitudinal axis of the cylindrical element.
The manoeuvring element comprises in one embodiment a telescoping rod extendable to a position outside the cylindrical element, and the control means comprise a handle bar connected to the telescoping rod free end.
The control means comprises a speed control means and control means for moving the tool or inspection apparatus between a non-engaging position and the operating position.
The main body and the support body preferably comprise an engineering
thermoplastic material, such as polyoxymethylene.
In one embodiment, the support body is adjustable and/or releasable with respect to the main body, such that the tool carrier circumference may be adjusted to suit the inner circumference of the cylindrical element.
The tool or inspection apparatus may be any one of the items of the group comprising a grinder, a polishing device, a welding apparatus, a measurement tool, an inspection tool, a gauge.
The invented apparatus is particularly suited for treating, monitoring and gauging the internal surfaces of tubular objects, including but not necessarily limited to mending structural damage, removing impurities and/or plaque, welding, grinding, inspecting, and measuring such parameters as internal diameter and eccentricity.
The invented apparatus uses the cylindrical wall as a guide for axial movement of the tool carrier.
With the invention, cylinders and accumulators may be cleaned and treated in situ, and there is no need to ship the equipment onshore for repair or refurbishment. Consequently, the invention makes it possible to save time and costs, compared to the methods and means of the prior art. Brief description of the drawings
These and other characteristics of the invention will be clear from the following description of a preferential form of embodiment, given as a non-restrictive example, with reference to the attached drawings wherein:
Figure 1 is a perspective drawing of a DAT system on a floating drilling rig;
Figure 2 is a perspective drawing of an embodiment of the apparatus according to the invention;
Figure 3 is a perspective drawing of the telescopic rod and the control handle;
Figure 4 is a perspective view of a part of the tool carrier, illustrating in particular the tool unit;
Figure 5 and figure 6 are two different perspective views of the tool carrier;
Figure 7 is an end view of the tool carrier, and illustrates the tool carrier as seen in the longitudinal direction of the telescopic rod; and
Figure 8 is a side view of the tool carrier.
Detailed description of preferential embodiments
Figure 1 illustrates a DAT system 1 comprising a number of hydraulic-pneumatic cylinders 2 suspended in a circle-symmetrical configuration. Cylinder rods 5 are connected to a tensioner ring 6, which in turn is connected to a riser 8. In figure 1, the cylinder rods are shown in a partly extended state.
An embodiment of the invented apparatus is shown in figure 2. The apparatus basically comprises a tool carrier 3, which carries a tool 12 and is connected to a control handle 4 via a telescopic rod 7. Referring also to figure 3, an inner telescoping rod 7a is connected to the tool carrier 3 via a flange 16 and associated bolts (not shown). The control handle 4 is connected to an outer telescoping rod 7b, and the inner rod 7a fits telescopingly into the (hollow) outer rod 7b, in a known manner. The control handle 4, designed to be held by a human operator, is furnished with first and second control switches 14, 15 for controlling the tool 12.
The tool carrier 3 comprises a main body 3a and a support 3b. The material in the main body and the support is preferably a light-weight, high precision material, with high stiffness, low friction and a high degree of dimensional stability, preferably an engineering thermoplastic such as polyoxymethylene (commonly referred to as POM and also known as acetal, polyacetal or polyformaldehyde).
Arranged on the forward end of the tool carrier is a tool 12, in the illustrated embodiment a grinder unit 12. Referring also to figures 4 - 8, the grinder unit 12 comprises a motor 18 and a grinding disk 19, connected to the motor via a chuck 20, in a manner which is well known in the art. The motor (which may be electrical or pneumatic) is controlled by the control switch 14.
The grinder unit 12 is connected to a bracket 21 on the housing via a slidable element 22, whereby the grinding disk 19 may be moved into contact with the cylinder interior wall, and thus grind the wall surface. The sliding movement, between an operating (grinding) position and a non-operating position, is performed by known means, e.g. by a pneumatic motor (not shown), controlled by the control switch 15. In order to ensure a controlled and accurate movement of the grinding disk in relation to the wall surface, the slidable element 22 is furnished with a micrometer screw or similar device (indicated schematically with reference number 23), whereby minute and precise adjustments may be made.
The grinding disk is tilted at an angle a with respect to the longitudinal axis z-z (see figure 8). Thus, the face of the grinding disk exhibits a shallow angle a with respect to the cylinder interior wall, whereby the grinding face contact area on the wall surface may be better controlled. The grinder tilt is accomplished by a skew mounting plate 24 between the grinder unit 12 and the slidable element 22. Thus, the grinding disk may be moved into and out of contact with the interior wall surface, and thus grind the surface at the desired spots.
The tool carrier 3 is furnished with rollers 25 arranged at regular intervals around the tool carrier periphery. The rollers are supported in socket and spring loaded, and configured for interaction with the interior wall and thus serve to support the tool carrier inside the cylinder. The spring loaded rollers serve to stabilise the tool carrier against the tubular surface. The rollers are preferably of a material similar to that of the wall surface. In the illustrated embodiment, two pairs of rollers are arranged on the y-shaped main body 3a, and one pair of rollers is arranged on the support 3b.
The support 3b is connected to the main body 3a at a junction 3c. The radial dimension of the support 3b may be varied, and/or the support may be exchanged with supports having smaller or larger dimensions, in order to allow the tool carrier to fit inside a given cylinder circumference C (see figure 7). The support may also comprise adjustment means (not shown), enabling a radial movement as indicated by the double arrow M in figure 7. The tool carrier 3 radial dimension may thus adjusted to suit the applicable cylinder dimension.
The grinder unit may be powered by external sources, via a cables (not shown), or may have built-in power sources in the form of battery packs, etc. (not shown). For example, the grinder motor 18 may be a pneumatic motor, connected to a distal pressurized air supply via an air hose (not shown). The tool carrier is also advantageously equipped with a light source 26 and a camera 27 for illuminating a and inspecting the surface to be cleaned. The tool may be replaced by, or augmented by, other tools such as a welding tool, gauges and measurement instruments. Although the invention has been described with a grinder unit, it should be understood that the grinder unit may be replaced by any tool, inspection unit or measuring unit. Examples of such tools are polisher, mechanical and/or optical gauge, welding apparatus, detergent spray nozzle.

Claims

Claims
1. An apparatus for treating and/or inspecting an inner surface of a cylindrical element (2), characterized by a tool carrier (3) having a main body (3a) and a support body (3b), the main body and support body comprises support elements in the form of rollers (25) for supporting the tool carrier (3) against the inner surface of the cylindrical element, the tool carrier (3) being connected to a tool carrier manoeuvring element (7) and is configured for supporting a tool or inspection apparatus (12), and the manoeuvring element further comprises control means (4) for operating the tool or inspection apparatus.
2. The apparatus of claim 1 , wherein the support elements are arranged so as to define an inscribed circle inside the cylindrical element inner circumference.
3. The apparatus of any one of the preceding claims, wherein the tool or inspection apparatus (12) is supported by a movable element (22) which is configured for moving the tool or inspection apparatus (12) between a non-engaging position with respect to the inner surface, and an operating position in which the tool or inspection apparatus (12) is operable to treat or inspect the inner surface.
4. The apparatus of any one of the preceding claims, wherein the tool or inspection apparatus comprises a grinder (12) having a motor (18) and grinding disk (19) configured and arranged for grinding and/or polishing selected regions of the cylindrical element inner surface.
5. The apparatus of claim 4, wherein the motor axis is arranged at an angle (a) different from 0° with respect to the longitudinal axis (z) of the cylindrical element.
6. The apparatus of any one of the preceding claims, wherein the manoeuvring element (7) comprises a telescoping rod 7a,b extendable to a position outside the cylindrical element, and the control means (4) comprise a handle bar connected to the telescoping rod free end.
7. The apparatus of any one of the preceding claims, wherein the control means (4) comprises a speed control means (14) and control means (15) for moving the tool or inspection apparatus (12) between a non-engaging position and the operating position.
8. The apparatus of any one of the preceding claims, wherein the main body (3a) and support body (3b) comprise an engineering thermoplastic material, such as polyoxymethylene (POM).
9. The apparatus of any one of the preceding claims, wherein the support body (3b) is adjustable and/or releasable with respect to the main body (3a), such that the tool carrier circumference may be adjusted to suit the inner circumference of the cylindrical element.
10. The apparatus of any one of the preceding claims, wherein the tool or inspection apparatus (12) comprises any one of the items of the group comprising a grinder, a polishing device, a welding apparatus, a measurement tool, an inspection tool, a gauge.
PCT/EP2013/050644 2012-01-18 2013-01-15 An apparatus for treating the inner surface of a cylindrical element WO2013107726A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20120059A NO341305B1 (en) 2012-01-18 2012-01-18 Apparatus for treating the inner surface of a cylindrical member
NO20120059 2012-01-18

Publications (2)

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WO2013107726A2 true WO2013107726A2 (en) 2013-07-25
WO2013107726A3 WO2013107726A3 (en) 2014-04-10

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WO (1) WO2013107726A2 (en)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2203175A (en) * 1939-04-25 1940-06-04 Sheffield F Oliver Piston expanding tool
US3713256A (en) * 1971-10-28 1973-01-30 Besenbruch Hofmann Adjustable grinding tool for brake cylinders and the like
US4051637A (en) * 1977-03-16 1977-10-04 Norikazu Takeishi Cylinder internal grinder
JPS60177262A (en) * 1984-02-24 1985-09-11 Hitachi Ltd Jet propulsion type in-tube inspecting device
GB8416380D0 (en) * 1984-06-27 1984-08-01 Ae Plc Manufacture of pistons
US5551802A (en) * 1993-02-08 1996-09-03 Sea Engineering Associates, Inc. Tension leg platform and method of installation therefor
WO1998043062A1 (en) * 1997-03-24 1998-10-01 Bj Services Company Inspection with global positioning and inertial navigation

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Publication number Publication date
NO20120059A1 (en) 2013-07-19
NO341305B1 (en) 2017-10-02
WO2013107726A3 (en) 2014-04-10

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