EP2309096A1 - System zum Prüfen eines Gehäuses - Google Patents

System zum Prüfen eines Gehäuses Download PDF

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Publication number
EP2309096A1
EP2309096A1 EP09172263A EP09172263A EP2309096A1 EP 2309096 A1 EP2309096 A1 EP 2309096A1 EP 09172263 A EP09172263 A EP 09172263A EP 09172263 A EP09172263 A EP 09172263A EP 2309096 A1 EP2309096 A1 EP 2309096A1
Authority
EP
European Patent Office
Prior art keywords
casing
wellhead
detector unit
unit
transmitter unit
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.)
Withdrawn
Application number
EP09172263A
Other languages
English (en)
French (fr)
Inventor
Jørgen HALLUNDBAEK
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.)
Welltec AS
Original Assignee
Welltec 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 Welltec AS filed Critical Welltec AS
Priority to EP09172263A priority Critical patent/EP2309096A1/de
Priority to PCT/EP2010/064791 priority patent/WO2011042413A1/en
Publication of EP2309096A1 publication Critical patent/EP2309096A1/de
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • E21B47/00—Survey of boreholes or wells
    • E21B47/007—Measuring stresses in a pipe string or casing

Definitions

  • the present invention relates to a system for inspecting a casing, such as a tubing, tubular, pipe, or liner downhole.
  • the casing is connected with a wellhead arranged partly above a surface of a ground or on a seabed, which wellhead is adapted to seal off an interior part of the casing.
  • the system comprises an inspection device adapted to inspect the wellhead and/or a part of the casing.
  • the wellhead may be surrounded by a foundation and the wellhead and the foundation may unintendly be displaced in relation to each other.
  • the ground around the wellbore may not be stable enough to withstand the load of the foundation, thus causing the foundation to sink slightly into the ground or tilt slightly.
  • stress on the wellhead may affect the joint between the wellhead and the casing as well as the upper part of the casing, which may cause the casing to crack and thus become weakened.
  • Loads on the wellhead or foundation may moreover be enhanced when equipment is mounted on the wellhead or is supported on the foundation surrounding the wellhead, e.g. if a subsea well intervention module is mounted onto the wellhead in order to carry out an operation.
  • the casing itself may be displaced or bent making access through the casing difficult. The risk of this is increased if the material of the casing has been weakened as well.
  • a casing such as a tubing, tubular, pipe, or liner downhole
  • a system for inspecting a casing such as a tubing, tubular, pipe, or liner downhole, which casing is connected with a wellhead arranged partly above a surface of a ground or on a seabed and which wellhead again is adapted to seal off an interior part of the casing, the system comprising:
  • Such a system makes it possible to check for weaknesses in the material of the casing and for possible cracks or bends in the casing. Moreover, the inspection process can be carried out before placing heavy loads on or around the wellhead, and stress on the wellhead is thus avoided. The entire inspection process takes place before mounting any equipment either directly or indirectly on the wellhead, also serving to avoid inadvertent stress on the wellhead.
  • a casing all kinds of pipes, tubings, tubulars, liners, strings, etc. used downhole in relation to oil or natural gas production.
  • the detector unit may be arranged inside the wellhead or the casing and the transmitter unit may be arranged outside the wellhead or the casing, or vice versa.
  • the detector unit may be an image recording device or be connected to an image recording device in order to detect any irregularity of the wellhead or the casing.
  • the transmitter unit may be arranged subterraneanly at a distance from the casing.
  • the transmitter unit may emit radiation below ground level, making it possible to align the transmitter unit with the detector unit vertically.
  • the transmitter unit and the detector unit are placed at approximately the same vertical level, it is possible to isolate the exposed area of the casing - i.e. the upper part of the casing just below ground level - for inspection for cracks and weaknesses in the material.
  • Three or more transmitter units may be arranged around the casing with predetermined distances between them and with predetermined distances from the casing.
  • the lowering means may comprise rotation means enabling either the transmitter unit or the detector unit to be rotated within the wellhead and/or the casing.
  • the transmitter unit or detector unit itself may comprise rotation means.
  • it is the detector unit which is lowered into the casing and which is rotated.
  • the entire periphery of the casing may be inspected in a simple manner, simply by rotating either the transmitter unit or the detector unit
  • the transmitter unit and detector unit of the inspection device may comprise radiographic means.
  • inspection of the material of the casing may be performed in a simple and non-destructive manner, which again provides a simple and reliable method for testing the state of the wellhead and/or the upper part of the casing.
  • the transmitter unit may be a source of electromagnetic radiation and the detector unit may be a radiation detector.
  • the electromagnetic radiation may lie within an X-ray spectrum or a gamma ray spectrum.
  • the detector unit may be connected to signal processing and displaying equipment and signals received from the detector unit may be processed to cross-sectional radiographic images of the wellhead and/or the upper part of the casing.
  • an operator may monitor the state of the wellhead and casing in order to identify possible cracks and/or weaknesses.
  • the detector unit may be a photographic plate or a photostimulable phosphor plate.
  • the transmitter unit and detector unit of the inspection device may comprise acoustic means, thus providing alternative ways of inspecting the material of the casing in a way which is simple, non-destructive, as well as reliable.
  • the system may be adapted to operate subsea.
  • the ground around the well bore may often be unstable, and equipment resting on the seabed may thus often be displaced in relation to the wellhead and the casing.
  • a wireline may moreover be connected to the transmitter unit and/or the detector unit.
  • wireline makes it easier to control the different units.
  • cables may be used to control units from a distance and data and/or signals may be transmitted by wireline.
  • wireline may be used to raise or lower the units.
  • a storage device When using signal processing and displaying equipment, a storage device may be connected to this equipment.
  • the invention relates to a method for inspecting a casing, such as a tubing, tubular, pipe, or liner downhole, which casing is connected with a wellhead arranged partly above a surface of a ground or on a seabed and which wellhead again is adapted to seal off an interior part of the casing, the method comprising the steps of:
  • At least one hole may be provided in the subsoil around the casing and a transmitter unit may be arranged in the hole.
  • At least one transmitter unit may be inserted into the subsoil.
  • the unit placed inside the wellhead and casing may be rotated.
  • a system 1 for inspecting a casing 2 inserted in a wellbore subsea is shown.
  • the casing 2 is connected to a wellhead 3 partly arranged on the seabed 15 and surrounded by a foundation 12.
  • the system also comprises an inspection device.
  • the casing 2 often consists of steel tubing having a wall thickness and a mainly circular cross-sectional form.
  • the inspection device consists of a detector unit 7 placed within the upper part 5 of the casing 2 - which upper part of the casing, however, lies below the seabed 15 - and a number of transmitter units 6 arranged in the seabed 15 around the foundation 12 with predetermined distances between them and with predetermined distances from the casing. Both the detector unit 7 and the transmitter units 6 are connected to a vessel 16 on the surface of the sea via wirelines 17.
  • the number of both detector units 7 and transmitter units 6 may vary. Thus, in another embodiment, it is possible to have more than one detector unit 7 and only one transmitter unit 6. Also, it may be that it is a transmitter unit 6 that is placed within the upper part 5 of the casing instead of a detector unit 7. However, the solution where it is the detector unit 7 that is placed inside the upper part 5 of the casing is preferred at present.
  • the detector unit 7 and the transmitter units 6 are connected to the vessel 16 on the surface via wirelines 17; however, other forms of lowering means may be used instead.
  • FIG. 2 an inspection device 4 consisting of one detector unit 7 and three transmitter units 6 is shown.
  • the detector unit 7 is placed within the upper, subterranean part 5 of the casing and the three transmitter units 6 are arranged around the casing 2 with predetermined distances between them and with predetermined distances from the casing.
  • the casing 2 is surrounded by a foundation 12.
  • the transmitter units 6 may be sources of electromagnetic radiation and the detector unit 7 may be a radiation detector.
  • the transmitter units 6 emit radiation (indicated by the dotted lines) which is detected by the detector unit 7. This makes it possible to align the transmitter units 6 with the detector unit 7 vertically.
  • the exposed area of the casing - i.e. the upper part 5 of the casing just below ground level - is isolated, making it possible to inspect the area for cracks and weaknesses in the material.
  • the system 1, consisting of the transmitter 6 and detector units 7 of the inspection device, may use electromagnetic radiation for inspecting the casing 2 and/or the wellhead 3.
  • the electromagnetic radiation may lie within an X-ray spectrum or a gamma ray spectrum.
  • the transmitter 6 and detector units 7 of the inspection device 4 may use acoustic for inspecting the casing 2 and/or the wellhead 3.
  • a vehicle 20 comprises lowering means 8 in the form of a crane and a winch.
  • the lowering means 8 is connected to the detector unit 7, which is lowered into the casing 2 through the wellhead 3.
  • the transmitter units 6 are placed in holes below a surface of the ground 18 and transmit rays, radiation, or signals (indicated by the arrows 21) through the ground and through the wall of the casing 2 to the detector unit 7.
  • the detector unit 7 is connected to signal processing and displaying equipment (not shown).
  • the signals received from the detector unit 7 are processed to cross-sectional radiographic images of the wellhead 3 and/or the upper part 5 of the casing, which may be used to inspect the casing and/or wellhead for any irregularities that might influence the strength of the casing.
  • the signal processing and displaying equipment 25 comprises a signal processing unit 26, a storage device 27, and a displaying device 28.
  • Figs. 5 and 6 show two examples of a casing 2 with irregularities.
  • the casing has been bent.
  • the casing 2 is connected to a foundation 12, which has tilted in relation to its original position, causing the casing 2 to bend in the area 31.
  • the casing 2 is very difficult to use since no tool or equipment can be brought to operate properly inside the casing, but will be hindered by the bend. This irregularity may also be discovered using the system 1 according to the present invention.

Landscapes

  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Geophysics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)
  • Geophysics And Detection Of Objects (AREA)
EP09172263A 2009-10-05 2009-10-05 System zum Prüfen eines Gehäuses Withdrawn EP2309096A1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP09172263A EP2309096A1 (de) 2009-10-05 2009-10-05 System zum Prüfen eines Gehäuses
PCT/EP2010/064791 WO2011042413A1 (en) 2009-10-05 2010-10-05 System for inspecting a casing

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP09172263A EP2309096A1 (de) 2009-10-05 2009-10-05 System zum Prüfen eines Gehäuses

Publications (1)

Publication Number Publication Date
EP2309096A1 true EP2309096A1 (de) 2011-04-13

Family

ID=41571050

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09172263A Withdrawn EP2309096A1 (de) 2009-10-05 2009-10-05 System zum Prüfen eines Gehäuses

Country Status (2)

Country Link
EP (1) EP2309096A1 (de)
WO (1) WO2011042413A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10054713B2 (en) 2015-12-02 2018-08-21 Halliburton Energy Services, Inc. Acousto-electromagnetic measurement through use of Doppler spectrum for casing corrosion evaluation

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3221548A (en) * 1961-06-02 1965-12-07 Dresser Ind Combination logging system and method
US3489219A (en) * 1966-03-10 1970-01-13 Halliburton Co Method of locating tops of fluids in an annulus
US4701892A (en) * 1986-02-19 1987-10-20 Sonar & Wells Testing Services, Inc. Downhole casing inspection system
US5397985A (en) * 1993-02-09 1995-03-14 Mobil Oil Corporation Method for the imaging of casing morphology by twice integrating magnetic flux density signals
US20010027865A1 (en) * 2000-02-02 2001-10-11 Wester Randy J. Non-intrusive pressure measurement device for subsea well casing annuli
US20070211572A1 (en) * 2004-03-17 2007-09-13 Baker Hughes Incorporated Combined Electro-Magnetic Acoustic Transducer

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3221548A (en) * 1961-06-02 1965-12-07 Dresser Ind Combination logging system and method
US3489219A (en) * 1966-03-10 1970-01-13 Halliburton Co Method of locating tops of fluids in an annulus
US4701892A (en) * 1986-02-19 1987-10-20 Sonar & Wells Testing Services, Inc. Downhole casing inspection system
US5397985A (en) * 1993-02-09 1995-03-14 Mobil Oil Corporation Method for the imaging of casing morphology by twice integrating magnetic flux density signals
US20010027865A1 (en) * 2000-02-02 2001-10-11 Wester Randy J. Non-intrusive pressure measurement device for subsea well casing annuli
US20070211572A1 (en) * 2004-03-17 2007-09-13 Baker Hughes Incorporated Combined Electro-Magnetic Acoustic Transducer

Also Published As

Publication number Publication date
WO2011042413A1 (en) 2011-04-14

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