EP0907822B1 - Method for expanding a steel tubing and well with such as tubing - Google Patents
Method for expanding a steel tubing and well with such as tubing Download PDFInfo
- Publication number
- EP0907822B1 EP0907822B1 EP97930490A EP97930490A EP0907822B1 EP 0907822 B1 EP0907822 B1 EP 0907822B1 EP 97930490 A EP97930490 A EP 97930490A EP 97930490 A EP97930490 A EP 97930490A EP 0907822 B1 EP0907822 B1 EP 0907822B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tubing
- expansion
- expanded
- steel
- mandrel
- 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.)
- Expired - Lifetime
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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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/02—Subsoil filtering
- E21B43/10—Setting of casings, screens, liners or the like in wells
- E21B43/103—Setting of casings, screens, liners or the like in wells of expandable casings, screens, liners, or the like
- E21B43/105—Expanding tools specially adapted therefor
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D7/00—Modifying the physical properties of iron or steel by deformation
- C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
- C21D7/10—Modifying the physical properties of iron or steel by deformation by cold working of the whole cross-section, e.g. of concrete reinforcing bars
- C21D7/12—Modifying the physical properties of iron or steel by deformation by cold working of the whole cross-section, e.g. of concrete reinforcing bars by expanding tubular bodies
-
- 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
Abstract
Description
- The invention relates to expansion of tubings. More particularly the invention relates to a method of expanding a steel tubing by moving an expansion mandrel through the tubing.
- Numerous methods and devices are known for expansion of tubings.
- European patent specification
643794 -
- Many of the known expansion methods employ an initially corrugated tube and the latter prior art reference employs a slotted tube which is expanded downhole by an expansion mandrel.
- The use of corrugated or slotted pipes in the known methods serves to reduce the expansion forces that need to be exerted to the tube to create the desired expansion.
- A method in accordance with the preamble of claim 1 is known from
US patent specification No. 5,366,012 . In this known method a slotted tube is expanded by an expansion mandrel having a tapering expansion section. - It is an object of the present invention to provide a method for expanding an at least partly solid, i.e. unslotted, tubing which requires exertion of a low force to expand the tubing and which provides a tubing having a larger diameter and higher strength than the unexpanded tubing and which can be carried out with a tubing which already may have a tubular shape before expansion.
- The method according to the invention thereto comprises the step of moving an expansion mandrel of which the tapering expansion section has a tapering ceramic outer surface through an at least partly solid tubing which is made of a formable steel grade which is subject to strain hardening without incurring any necking and ductile fracturing as a result of the expansion process.
- As a result of strain hardening the tubing becomes stronger during the expansion process since for any further increment of expansion always a higher stress is required than for the preceding expansion.
- It has been found that the use of a formable steel grade for the tubing in combination with a ceramic tapering outer surface of the expansion mandrel has a synergetic effect since the resulting expanded tubing will have an adequately increased strength while the expansion forces remain low. The low yield strength and high ductility of the tubing before expansion enables, if the tubing is to be used in an underground borehole, the use of a tubing which is reeled from a reeling drum into the borehole.
- It is observed that in the art of metallurgy the terms strain-hardening and work-hardening are synonyms and are both used to denote an increase of strength caused by plastic deformation.
- The term formable steel grade as used in this specification means that the tubing is able to maintain its structural integrity while being plastically deformed into various shapes.
- Ways of determining forming characteristics of a steel are set out in the Metals Handbook, 9th edition, volume 14, Forming and Forging, issued by ASM International, Metals Park, Ohio (USA).
- The term necking refers to a geometrical effect leading to non-uniform plastic deformations at some location by occurrence of a local constriction. From the point of necking on, the continual work hardening in the necked region no longer compensates for the continual reduction of the smallest cross-section in the neck, and therefore, the load carrying capacity of the steel decreases. With continuing loading, practically all further plastic deformation is restricted to the region of the neck, so that a highly non-uniform deformation occurs to develop in the necked region until fracture occurs.
- The term ductile fracturing means that a failure occurs if plastic deformation of a component that exhibits ductile behaviour is carried to the extreme so that the component separates locally into two pieces. Nucleation, growth and coalescence of internal voids propagate to failure, leaving a dull fibrous rupture surface. A detailed description of the terms necking and ductile fracturing is given in the handbook "Failure of Materials in Mechanical Design" by J.A. Collins second edition, issued by John Wiley and Sons, New York (USA) in 1993.
- Preferably the tubing is made of a high-strength steel grade with formability and having a yield strength-tensile strength ratio which is lower than 0.8 and a yield strength of at least 275 MPa. When used in this specification, the term high-strength steel denotes a steel with a yield strength of at least 275 MPa.
- It is also preferred that the tubing is made of a formable steel grade having a yield stress/tensile stress ratio which is between 0.6 and 0.7.
- Dual phase (DP) high-strength, low-alloy (HSLA) steels lack a definite yield point which eliminates Luders band formation during the tubular expansion process which ensures good surface finish of the expanded tubular.
- Suitable HSLA dual phase (DP) steels for use in the method according to the invention are grades DP55 and DP60 developed by Sollac having a tensile strength of at least 550 MPa and grades SAFH 540 D and SAFH 590 D developed by Nippon Steel Corporation having a tensile strength of at least 540 MPa.
- It is observed that
US patent specification No. 4,938,266 discloses a method for producing dual phase steels. - Other suitable steels are the following formable high-strength steel grades
- an ASTM A106 high-strength low alloy (HSLA) seamless pipe;
- an ASTM A312 austenitic stainless steel pipe, grade TP 304 L;
- an ASTM A312 austenitic stainless steel pipe, grade TP 316 L; and
- a high-retained austenite high-strength hot-rolled steel (low-alloy TRIP steel) such as grades SAFH 590 E, SAFH 690 E and SAFH 780 E developed by Nippon Steel Corporation.
- The above-mentioned DP and other suitable steels each have a strain hardening exponent n of at least 0.16 which allows an expansion of the tubing such that the external diameter of the expanded tubing is at least 20% larger than the external diameter of the unexpanded tubing.
- Detailed explanations of the terms strain hardening, work hardening and the strain hardening exponent n are given in
chapters 3 and 17 of the handbook "Metal Forming-Mechanics and Metallurgy", 2nd edition, issued by Prentice Hall, New Jersey (USA), 1993. - Suitably, the expansion mandrel contains an expansion section that has a conical ceramic outer surface. It is observed that
US patent specification No. 3,901,063 discloses a plug having a conical ceramic outer surface for use in tube-drawing operations. If the expansion mandrel is pumped through the tubing then the mandrel preferably comprises a sealing section which is located at such a distance from the tapering expansion section that when the expansion mandrel is moved through the tubing by means of exerting a hydraulic pressure behind the mandrel the sealing section engages a plastically expanded part of the tubing. This will generally be achieved if said distance is at least three times the wall thickness of the expanded tubing. - The use of a ceramic conical surface reduces friction forces during the expansion process and by having a sealing section which engages the expanded tube it is avoided that hydraulic forces would result in an excessive expansion of the tubing.
- In such case it is preferred that the expansion mandrel contains a vent line for venting to the surface any fluids that are present in the borehole and tubing ahead of the expansion mandrel.
- Alternatively the tubing is expanded such that the outer diameter of the expanded tubing is slightly smaller than the internal diameter of the borehole or of any casing that is present in the borehole and any fluids that are present in the borehole and tubing ahead of the expansion mandrel are vented to surface via the annular space that remains open around the tubing after the expansion process.
- A well is provided with a tubing which is expanded using the method according to the invention. In such case the tubing may serve as production tubing through which hydrocarbon fluid is transported to the surface and a reelable service and/or kill line passes through at least a substantial part of the length of the tubing, through which line fluid can be pumped towards the bottom of the borehole while hydrocarbon fluid is produced via the surrounding production tubing. The use of such an expanded production tubing allows the use of almost the full wellbore for the transport of hydrocarbon fluids so that a relatively slim borehole may be utilized to attain the desired production rate.
- Alternatively the tubing may be expanded against the inner surface of a casing which is present in the borehole. In such case the tubing may either be used as a production tubing and/or as a protective cladding for protecting the well casing against corrosive well fluids and damage from tools that may be lowered into the well during maintenance and workover operations.
- These and other objects, features and advantages of the method and well system according to the present invention will be apparent from the accompanying claims, abstract and the following detailed description with reference to the accompanying drawing, in which
Fig. 1 is schematic longitudinal sectional view of an underground borehole in which a tubing is expanded in accordance with the method according to the invention. - Now referring to
Fig. 1 , there is shown a borehole traversing an underground formation 1 and acasing 2 that is fixed within the borehole by means of an annular body ofcement 3. - A
production tubing 4 which is made of a dual phase, high-strength low-alloy (HSLA) steel or other formable high-strength steel is suspended within thecasing 2. - An
expansion mandrel 5 is moved in longitudinal direction through thetubing 4 thereby expanding thetubing 4 such that the outer diameter of the expanded tubing is slightly smaller than or is about equal to the internal diameter of thecasing 2. - The
expansion mandrel 5 is equipped with a series ofceramic surfaces 6 which restrict frictional forces between the pig andtubing 4 during the expansion process. In the example shown the semi top angle A of the conical ceramic surface that actually expands the tubing is about 25°. It has been found that zirconium oxide is a suitable ceramic material which can be formed as a smooth conical ring. Experiments and simulations have shown that if the semi cone top angle A is between 20° and 30° the pipe deforms such that it obtains an S-shape and touches the tapering part of theceramic surface 6 essentially at the outer tip or rim of said conical part and optionally also about halfway the conical part. - The experiments also showed that it is beneficial that the expanding
tubing 4 obtains an S-shape since this reduces the length of the contact surface between the tapering part of theceramic surface 6 and thetubing 4 and thereby also reduces the amount of friction between theexpansion mandrel 5 and thetubing 4. - Experiments have also shown that if said semi top angle A is smaller than 15° this results in relatively high frictional forces between the tube and pig, whereas is said top angle is larger than 30° this will involve redundant plastic work due to plastic bending of the
tubing 4 which also leads to higher heat dissipation and to disruptions of the forward movement of thepig 5 through thetubing 4. Hence said semi top angle A is preferably selected between 15° and 30° and should always be between 5° and 45°. - Experiments have also shown that the tapering part of the
expansion mandrel 5 should have a non-metallic outer surface to avoid galling of the tubing during the expansion process. The use of a ceramic surface for the tapering part of the expansion mandrel furthermore caused the average roughness of the inner surface of thetubing 4 to decrease as a result of the expansion process. The experiments have also shown that theexpansion mandrel 5 provided with a ceramic taperingsurface 6 could expand atubing 4 made of a formable steel such that the outer tubing diameter D2 after expansion was at least 20% larger than the outer diameter D1 of the unexpanded tubing and that suitable formable steels are dual phase (DP) high-strength low alloy (HSLA) steels known as DP55 and DP60; ASTM A106 HSLA seamless pipe, ASTM A312 austenitic stainless steel pipes, grades TP 304 L and TP 316 L and a high-retained austenite high-strength hot rolled steel, known as TRIP steel manufactured by the Nippon Steel Corporation. - The
mandrel 5 is provided with a pair ofsealing rings 7 which are located at such a distance from the conicalceramic surface 6 that therings 7 face the plastically expanded section of thetubing 4. The sealing rings serve to avoid that fluid at high hydraulic pressure would be present between the conicalceramic surface 6 of themandrel 5 and the expandingtubing 4 which might lead to an irregularly large expansion of thetubing 4. - The
expansion mandrel 5 is provided with a central vent passage which is in communication with acoiled vent line 8 through which fluid may be vented to the surface. After completion of the expansion process thepig 5 may be pulled up to surface by the vent line and a coiled kill and/or service line (not shown) may be lowered into the expandedtubing 4 to facilitate injection of kill and/or treatment fluids towards the hydrocarbon fluid inflow zone which is normally be done via the annulus between the production tubing and the well casing. However, if thetubing 4 is expanded to a smaller diameter then the residual annular space between thecasing 2 and expandedtubing 4 can be used for venting of fluids during the expansion process and for injection of fluids during the production process, in which case there is no need for using avent line 8 and kill and/or service lines. - In conventional wells it is often necessary to use a production tubing having an outer diameter which is less than 50% of the inner diameter of the well casing to enable a smooth insertion of the tubing even if the well is deviated and the casing has an irregular inner surface. Therefore it is apparent that the in-situ tubing expansion method according to the present invention enhances an efficient use of the wellbore.
- It will be understood that instead of moving the expansion mandrel through the tubing by means of hydraulic pressure, the mandrel can also be pulled through the tubing by means of a cable or pushed through the tubing by means of pipe string or rod.
- The method according to the invention can also be used to expand tubings that are used outside a wellbore, for example to expand oilfield tubulars at surface facilities or to expand a tubing inside an existing tubing which has been damaged or corroded.
- The invention will now be further described on the basis of the following comparative experiments.
- An expansion mandrel having a conical ceramic surface (semi top angle A of cone = 20°) was moved through a conventional oil field tubular, known as casing grade L80 13% Cr, which is a widely used casing type, having an initial outer diameter of 101.6 mm (4"), an initial wall thickness of 5.75 mm, a burst pressure of 850 bar and a strain hardening exponent n = 0.075. The expansion mandrel was designed such that the outer diameter of the expanded tubular would be 127 mm, so that the increase in diameter would be 20%. The tubular burst during the expansion process. Analysis showed that the ductility limit of the material had been exceeded so that ductile fracturing occurred.
- An experiment was carried out with a coiled tubing of the type QT-800 which is increasingly used as a production tubing in oil or gas wells. The tubing had an initial outer diameter of 60.3 mm, a wall thickness of 5.15 mm, a burst pressure of 800 bar and a strain hardening exponent n = 0.14. An expansion mandrel was moved through the tubing which mandrel comprised a conical ceramic surface such that the semi top angle A of a cone enveloping the conical surface was 5° and which was designed such that the outer diameter of the expanded tubing would be 73 mm (increase of about 21%). This tubing burst during the expansion process. Analysis revealed that due to high friction forces the expansion pressure had exceeded the burst pressure of the pipe during the expansion process.
- An experiment was carried out with a seemless pipe made of a formable steel grade known as ASTM A 106 Grade B. The pipe had an initial outer diameter of 101.6 mm (4"), an initial wall thickness of 5.75 mm and a strain hardening exponent n = 0.175.
- An expansion mandrel was pumped through the pipe, which mandrel comprised a ceramic conical surface such that the semi top angle A of a cone enveloping the conical surface was 20° and such that the outer diameter of the expanded pipe was 127 mm (5") and the outer diameter increased by 21%.
- The pipe was expanded successfully and the hydraulic pressure exerted to the mandrel to move the mandrel through the pipe was between 275 and 300 bar. The burst pressure of the expanded pipe was between 520 and 530 bar.
Claims (15)
- A method of expanding a steel tubing (4) which is made of a formable steel grade, the method comprising the step of moving an expansion mandrel (5) having a tapering expansion section (6) through the tubing (4) thereby plastically expanding the tubing, characterized in that an at least partly solid tubing (4) is expanded which is made of a formable steel grade which is subject to strain hardening without incurring any necking and ductile fracturing as a result of the expansion process and that the tapering expansion section (6) of the expansion mandrel (5) has a tapering ceramic outer surface.
- The method of claim 1, wherein the tubing (4) is made of a formable steel grade having a yield strength-tensile strength ratio which is lower than 0.8 and a yield strength of at least 275 MPa.
- The method of claim 1 or 2, wherein the tubing (4) is made of a steel having a yield strength-tensile strength ratio which is between 0.6 and 0.7.
- The method of claim 1, 2 or 3, wherein the tubing (4) is made of a dual phase (DP) high-strength low alloy (HSLA) steel.
- The method of claim 4, wherein the tubing (4) is made of Sollac grade DP55 or DP60 having a tensile strength of at least 550 MPa or Nippon grade SAFH 540 D or SAFH 590 D.
- The method of claim 1, 2 or 3 wherein the tubing (4) is made of a formable high-strength steel grade which is selected from the following group of steel grades:- an ASTM A106 high-strength low alloy (HSLA) seamless pipe;- an ASTM A312 austenitic stainless steel pipe, grade TP 304 L;- an ASTM A312 austenitic stainless steel pipe, grade TP 316 L; and- a high-retained austenite high-strength hot rolled steel which is known as TRIP steel.
- The method of any preceding claim, wherein the tubing is expanded such that the external diameter of the expanded tubing is at least 20% larger than the external diameter of the unexpanded tubing (4) and wherein the strain hardening exponent n of the formable steel of the tubing (4) is at least 0.16.
- The method of any preceding claim, wherein the expansion mandrel (5) comprises a tapering expansion section (6) which has a smooth ceramic outer surface which is oriented at an acute angle A which is between 5° and 45° with respect to a longitudinal axis of the mandrel (5) and which induces the tubing (4) to expand without inducing any galling of the tubing and such that the average roughness of the inner surface of the tubing (4) decreases as a result of the expansion process.
- The method of claim 8, wherein the ceramic outer surface of the tapering expansion section (6) is made of zirconium oxide and is oriented at an acute angle A which is between 15° and 30° with respect to a longitudinal axis of the mandrel (5).
- The method of any preceding claim, wherein the tubing (4) is expanded by pumping the expansion mandrel (5) through the tubing (4).
- The method of claim 7 and 10, wherein the expansion mandrel (5) comprises a sealing section (7) which is located at such a distance from the expansion section (6) that when the expansion mandrel (5) is pumped through the tubing (4) the sealing section (7) engages a plastically expanded part of the tubing.
- The method of claim 10 or 11, wherein the tubing (4) is expanded inside an underground borehole and the expansion mandrel (5) contains a vent line (8) for venting any fluids that are present in the tubing (4) ahead of the expansion mandrel (5) to the surface.
- The method of claim 10 or 11, wherein the tubing (4) is expanded inside an underground borehole such that the outer diameter (D2) of the expanded tubing (4) is slightly smaller than the internal diameter of the borehole or of any casing (2) that is present in the borehole and any fluids that are present in the borehole and tubing (4) ahead of the expansion mandrel are vented to surface via the annular space that remains open around the tubing (4) after the expansion process.
- The method of any preceding claim, wherein the tubing (4) is lowered into an underground borehole after reeling the tubing from a reeling drum.
- A well provided with a tubing (4) which is expanded using the method of any preceding claim, wherein the tubing (4) serves as a production tubing through which hydrocarbon fluid is transported to the surface and a reelable service and/or kill line passes through at least a substantial part of the length of the interior of the tubing (4), through which line fluid can be pumped towards the bottom of the borehole while hydrocarbon fluid is produced via the surrounding production tubing (4).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP97930490A EP0907822B1 (en) | 1996-07-01 | 1997-06-30 | Method for expanding a steel tubing and well with such as tubing |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP96201809 | 1996-07-01 | ||
EP96201809 | 1996-07-01 | ||
PCT/EP1997/003489 WO1998000626A1 (en) | 1996-07-01 | 1997-06-30 | Method for expanding a steel tubing and well with such a tubing |
EP97930490A EP0907822B1 (en) | 1996-07-01 | 1997-06-30 | Method for expanding a steel tubing and well with such as tubing |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0907822A1 EP0907822A1 (en) | 1999-04-14 |
EP0907822B1 true EP0907822B1 (en) | 2008-12-17 |
Family
ID=8224125
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97930490A Expired - Lifetime EP0907822B1 (en) | 1996-07-01 | 1997-06-30 | Method for expanding a steel tubing and well with such as tubing |
Country Status (14)
Country | Link |
---|---|
EP (1) | EP0907822B1 (en) |
JP (1) | JP4289686B2 (en) |
AU (1) | AU723337B2 (en) |
BR (1) | BR9710016A (en) |
CA (1) | CA2260191C (en) |
DE (1) | DE69739166D1 (en) |
DK (1) | DK0907822T3 (en) |
EA (1) | EA000543B1 (en) |
ID (1) | ID17661A (en) |
MY (1) | MY116920A (en) |
NO (1) | NO317755B1 (en) |
NZ (1) | NZ333945A (en) |
OA (1) | OA10949A (en) |
WO (1) | WO1998000626A1 (en) |
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-
1997
- 1997-06-27 MY MYPI9702927 patent/MY116920A/en unknown
- 1997-06-30 JP JP50385298A patent/JP4289686B2/en not_active Expired - Lifetime
- 1997-06-30 DE DE69739166T patent/DE69739166D1/en not_active Expired - Lifetime
- 1997-06-30 DK DK97930490T patent/DK0907822T3/en active
- 1997-06-30 EA EA199900072A patent/EA000543B1/en not_active IP Right Cessation
- 1997-06-30 EP EP97930490A patent/EP0907822B1/en not_active Expired - Lifetime
- 1997-06-30 NZ NZ333945A patent/NZ333945A/en not_active IP Right Cessation
- 1997-06-30 WO PCT/EP1997/003489 patent/WO1998000626A1/en active Application Filing
- 1997-06-30 ID IDP972266A patent/ID17661A/en unknown
- 1997-06-30 CA CA002260191A patent/CA2260191C/en not_active Expired - Lifetime
- 1997-06-30 BR BR9710016A patent/BR9710016A/en not_active IP Right Cessation
- 1997-06-30 AU AU34420/97A patent/AU723337B2/en not_active Expired
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1998
- 1998-12-29 NO NO19986171A patent/NO317755B1/en not_active IP Right Cessation
- 1998-12-31 OA OA9800252A patent/OA10949A/en unknown
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MY116920A (en) | 2004-04-30 |
ID17661A (en) | 1998-01-15 |
CA2260191A1 (en) | 1998-01-08 |
NO317755B1 (en) | 2004-12-13 |
DE69739166D1 (en) | 2009-01-29 |
EA000543B1 (en) | 1999-10-28 |
AU723337B2 (en) | 2000-08-24 |
BR9710016A (en) | 1999-08-10 |
OA10949A (en) | 2003-02-27 |
EA199900072A1 (en) | 1999-06-24 |
JP2001508144A (en) | 2001-06-19 |
NO986171L (en) | 1999-02-22 |
CA2260191C (en) | 2007-11-27 |
EP0907822A1 (en) | 1999-04-14 |
DK0907822T3 (en) | 2009-03-02 |
NO986171D0 (en) | 1998-12-29 |
AU3442097A (en) | 1998-01-21 |
WO1998000626A1 (en) | 1998-01-08 |
JP4289686B2 (en) | 2009-07-01 |
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