EP1957850A1 - Ensemble a raccord pour masse-tiges ou tiges lourdes de forage - Google Patents
Ensemble a raccord pour masse-tiges ou tiges lourdes de forageInfo
- Publication number
- EP1957850A1 EP1957850A1 EP06841839A EP06841839A EP1957850A1 EP 1957850 A1 EP1957850 A1 EP 1957850A1 EP 06841839 A EP06841839 A EP 06841839A EP 06841839 A EP06841839 A EP 06841839A EP 1957850 A1 EP1957850 A1 EP 1957850A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- conical
- male
- assembly
- elements
- free end
- 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.)
- Granted
Links
- 238000005452 bending Methods 0.000 claims abstract description 9
- 230000000295 complement effect Effects 0.000 claims abstract description 8
- 238000005553 drilling Methods 0.000 description 25
- 230000006835 compression Effects 0.000 description 6
- 238000007906 compression Methods 0.000 description 6
- 238000005520 cutting process Methods 0.000 description 5
- 239000012530 fluid Substances 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 238000009826 distribution Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
- E21B17/042—Threaded
Definitions
- the present invention relates to fittings for tubular or cylindrical elements and more particularly to fittings intended to form a column of elements for drilling wells, in particular oil wells. More specifically, it relates to a connector assembly for drill rods and / or heavy drill rods.
- a drill string consists, generally, respectively from top to bottom, of four types of elements:
- drill rods in English: drill pipes
- drill rods in English: drill collars
- the drill rods are, by unit, the lightest of these three types of rods. They are generally an assembly by welding of a tube and two fittings (tool attached in English). The drill rods serve as a link between the tool and the surface, they are generally in tensile stress and serve to transmit the torque and the drilling fluid to the tool.
- the heavy rods have a much larger section than the drill rods and can be in one piece; they are often stressed in flexion and have external bulges on the body (wear pads in English) in order to reduce contact and therefore wear on the walls of the well. They are useful as transition elements between drill rods and drill rods. They considerably reduce the vibrations generated by the cutting of the rock by the tool.
- the drill sticks have very thick walls (of the order of several inches or several tens of millimeters); they are often machined in a spiral on their external part in order to leave a passage for the drilling fluid between the external surface of the rod mass and the wall of the well, this in order to reduce bonding by differential pressure. They can also receive external machining to facilitate their maneuver or their implementation ("slip and elevator recess" in English). They contribute by their weight to exert a cutting force on the drilling tool and to tension the drilling rods.
- the aim of the present invention is to connect the lower elements of such a drill string.
- the gravity acting, in particular, on the heavy rods and mass rods makes it possible to use them in compression in order to apply a force of penetration to the cutting elements of the drilling tool at the lower end of the drilling column.
- the quantity of heavy rods and mass rods used in a given column depends on the load that one wishes to apply to the drilling end.
- the elements of the drill string are rotated to give a cutting movement to the drilling tool located at its lower end.
- the elements of the drill string and in particular the drill rods and the heavy rods are therefore both stressed in compression and in torsion.
- the rods constituting the drill string are provided with connections at each of their ends making it possible to assemble them to each other, in order to obtain a desired configuration.
- this type of connection is made using complementary threaded surfaces arranged at the ends of the elements to be assembled, on male and female portions respectively, usually using seals enclosed by two suitable surfaces of said two portions.
- these are conical threads with a large pitch (several millimeters) in order to facilitate rapid assembly (a fraction of a turn necessary for tightening).
- API American Petroleum Institute
- a connector as defined by this standard is composed of a male element comprising a shoulder and an at least partially threaded conical portion extending from this shoulder to the free end of this element and of a complementary female element having a first internal conical surface threaded with the same conicity as the conical surface of the built-up element, but shorter than this, and extended by another smooth internal conical surface with a smaller conicity than said first conical surface.
- a problem encountered in this technical field and in particular with this type of fittings results from the fact that the elements of the drill string, in particular the drill rods and the heavy rods, have radial dimensions several times less than their longitudinal dimensions (typically, for a heavy rod: 900cm in length for a diameter of 25cm).
- the diameter of the boreholes in which the heavy rods and the drill rods are used is much greater than their own diameter. In general, the diameter of such a borehole is 17 Vz inches (about 44.5 cm).
- these columns of drilling elements are naturally stressed to deform in buckling in the drilled hole.
- This buckling results locally in bending forces, in particular at the level of the connections between the elements constituting the column.
- these connections constitute geometric discontinuities, (in particular due to the reductions in section) relative to the rest of the column; they are therefore, in the event of buckling of the latter, the place of stress concentrations, that consequently significant risks of rupture at this level.
- the torsional forces combined with repeated bending forces at the connections typically lead to fatigue failure problems caused mainly by stress concentrations on the female element, in particular on the circle forming the boundary between said two conical interior surfaces. It has been found, in practice, that ruptures caused by fatigue phenomena take place along this circle, portions of which are sometimes stressed in compression, sometimes in tension according to the random angular orientation of the buckling of the column.
- the present invention aims to overcome these drawbacks and relates to a connection assembly for drilling elements, which best meets the API Specification 7 standard but which makes it possible to withstand high internal stresses, resulting from torsional, compression and buckling forces. of the drill string, and thus avoid the rupture of elements of the fitting, in particular by fatigue phenomenon. More particularly, it aims to reduce the maximum value of the local stresses observed at the connection.
- a male connector element having substantially a shape of revolution about a longitudinal axis and which comprises in its longitudinal direction respectively:
- a substantially cylindrical female connector element complementary to said male connector element, and which comprises:
- a radial portion forming a bearing face for said shoulder of the first element and, longitudinally, coaxially and respectively, from this portion, an at least partially threaded conical inner surface complementary to the at least partially threaded conical surface of the male element,
- said two connecting elements being intended to be assembled into one another by screwing on several turns of the threads, characterized in that the male connecting element comprises, in addition, between said second portion and its free end, a third portion of conical surface less than that of the second conical surface portion, and dimensioned with respect to said cylindrical inner surface so that there is a clearance thanks to which, during a stress in bending of the assembly, these two surfaces respectively come into abutment.
- the present invention makes it possible to reduce the stresses observed at the level of the connections, resulting in particular from the buckling of the elements, and thus to increase the resistance to rupture by fatigue at the level of the connections.
- the female element takes up the standard dimensions defined by the API Specification 7 standard and the male element is the only element of the connector assembly to be modified while being compatible with standard female elements according to this standard.
- the invention further provides a male connector element for heavy rods or drill rod drills intended to cooperate with a female element and having substantially a shape of revolution around a longitudinal axis and which comprises in its longitudinal direction respectively:
- the male connector element further comprises, between said second portion and its free end, a third portion of conical surface less than that of the second portion of conical surface.
- the tubular elements described by this document are not actual drilling equipment. They are used almost statically during the exploitation of a drilled hole, and are not subjected to torsional and compression forces that are encountered in drilling equipment. These elements are only subjected to tensile forces exerted by their own weight. The role of the connections between these elements is limited to ensuring the seal between said elements and the external environment. The mechanical stresses which apply to these casing elements are therefore completely different from those of the present invention.
- the main problem is to guide the thread when assembling two elements so as not to damage it during screwing.
- connections between drill pipes, object of the present invention generally do not pose a screwing problem, and do not require guide elements.
- the present invention aims to reduce, at the connections between drilling elements, the concentration of stresses generated by the buckling resulting from the compression / twisting forces acting on the column.
- the male element has a groove disposed between said second portion and said third portion, such that, when said two elements are assembled, and when said shoulder is in abutment against the radial bearing face, the geometric limit between said conical inner surface and said cylindrical inner surface is included in the space formed by said groove;
- the third surface portion of the male element forming a bearing is substantially cylindrical
- the third portion has a longitudinal dimension at most equal to 2/3 of the longitudinal dimension of the second portion
- the third portion has a longitudinal dimension between 10% and 50% of its diameter
- the groove has a radius of curvature between ⁇ A and 3 inches, or approximately between 12 millimeters and 76 millimeters depending on the diameter of the fittings.
- the present invention proposes to distribute the stresses on either side of the limit between the two surfaces, without stressing this critical area directly by mechanical contact.
- the invention proposes to distribute the forces resulting from this bending over a higher contact surface between the two elements constituting the connector, and therefore to reduce the value of the maximum stresses observed. (the constraint being by definition a force per unit of surface).
- Figure 1 is a longitudinal sectional view of a conventional female element in itself, in accordance with the API standard.
- FIG. 2 is a view in longitudinal section of a built-up element according to the invention
- Figure 3 is a longitudinal sectional view of the two aforementioned elements in the assembled state according to the invention.
- a connector assembly 100 is composed of a maie element 300 and a female element 200 assembled. These two elements are respectively visible in isolation in FIGS. 2 and 1.
- the male connector element 300 has a shape of revolution and comprises in its longitudinal direction a first substantially cylindrical portion 302 shaped at one of its shoulder ends 301, and intended, at its opposite end, to cooperate with a column element of drilling (not shown), a conical portion 310 provided with a thread 311, a groove 320 being provided between said substantially cylindrical portion 302 shaped as a shoulder 301 and the conical portion 310, and a substantially cylindrical portion 330 forming the end of the element 300, and connected to the conical portion 310 by a groove 340.
- This groove advantageously has a radius of curvature between ⁇ A and 3 inches depending on the diameters of the fittings, that is to say between approximately 12 millimeters and 76 millimeters.
- connection element 300 is pierced at the end intended to cooperate with a column element of a substantially cylindrical bore 350 terminated by a conical portion 360 widening to open at the opposite end of the connection element 300 .
- the female connector element 200 also opens out and has a substantially cylindrical external shape, and, at its end opposite the end intended to cooperate with a drill string element (not shown), a radial face 201 forming face d support for cooperating with said shoulder 301, and, in the longitudinal direction, coaxially respectively, a portion of conical inner surface 210 partially provided with a thread 211 complementary to the conical surface 310 provided with the thread 311, a substantially cylindrical interior surface portion 220 intended to cooperate with the cylindrical portion 330 in free adjustment and preferably just sliding, a conical interior surface portion 230 of the same conicity as the portion 210 , an inner surface portion 240 of substantially higher taper than the portion 210, and a cylindrical surface portion 250 opening at the end intended to cooperate with a drill string element (not shown).
- the groove 340 is located between the conical surface 210 and the cylindrical surface 220, substantially opposite the circle 260 forming the boundary between these two surfaces.
- grooves 320 and 340 can be used for engaging and disengaging a cutting tool used for machining the thread 311 of the part 310 that they frame.
- the thread 311 can, however, be produced by any other method.
- the two grooves can also serve as relaxation grooves for pressurized fluids in order to contribute to the tightness of the assembly.
- these two grooves can receive seals (not shown), for example O-rings, in order to improve the tightness of the connector.
- a groove (not shown) can be machined in the bearing 330 in order to accommodate a seal sealing, for example an O-ring, always with a view to improving the sealing of the assembly, in particular during an erupting drilling, for example.
- a seal sealing for example an O-ring
- the bearing 330 can be not cylindrical but slightly conical (with a taper less than that of the threaded portions), at least partially, at its free end, to facilitate linear contact with bearing 220 in the event of bending of the assembly , and ensure better distribution
- the elements advantageously have the following dimensions, given by way of example (for an NC50 type connection according to the API standard):
- maximum internal diameter of the portion 210 approximately 153 millimeters
- total length of the conical portion 210 approximately 114 millimeters; threaded length of the conical portion 210: about 98 millimeters; length of the cylindrical portion 220: approximately 51 millimeters; - internal diameter of the cylindrical portion 220: approximately 134 millimeters;
- maximum outside diameter of the conical portion 310 approximately 154 millimeters
- minimum throat diameter 340 approximately 128 millimeters
- maximum width of the groove 340 approximately 20 millimeters
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
- Bulkheads Adapted To Foundation Construction (AREA)
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0512356A FR2894279B1 (fr) | 2005-12-06 | 2005-12-06 | Ensemble a raccord pour masse-tiges ou tiges lourdes de forage |
PCT/FR2006/002629 WO2007065986A1 (fr) | 2005-12-06 | 2006-12-01 | Ensemble a raccord pour masse-tiges ou tiges lourdes de forage |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1957850A1 true EP1957850A1 (fr) | 2008-08-20 |
EP1957850B1 EP1957850B1 (fr) | 2009-04-29 |
Family
ID=36952400
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06841839A Not-in-force EP1957850B1 (fr) | 2005-12-06 | 2006-12-01 | Ensemble a raccord pour masse-tiges ou tiges lourdes de forage |
Country Status (7)
Country | Link |
---|---|
US (1) | US20080289879A1 (fr) |
EP (1) | EP1957850B1 (fr) |
AT (1) | ATE430280T1 (fr) |
DE (1) | DE602006006594D1 (fr) |
DK (1) | DK1957850T3 (fr) |
FR (1) | FR2894279B1 (fr) |
WO (1) | WO2007065986A1 (fr) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102009052335A1 (de) * | 2009-08-28 | 2011-03-03 | Tracto-Technik Gmbh & Co. Kg | Steckkupplung für ein Bohrgestänge und Bohrgestänge |
CA3238483A1 (fr) * | 2022-01-31 | 2023-08-03 | Tomas Jansson | Element de forage |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5064224A (en) * | 1989-03-08 | 1991-11-12 | Baroid Technology, Inc. | Oil field tubular connection |
US5908212A (en) * | 1997-05-02 | 1999-06-01 | Grant Prideco, Inc. | Ultra high torque double shoulder tool joint |
CN1934386A (zh) * | 2004-03-31 | 2007-03-21 | Nkk钢管株式会社 | 双肩部工具接头 |
-
2005
- 2005-12-06 FR FR0512356A patent/FR2894279B1/fr not_active Expired - Fee Related
-
2006
- 2006-12-01 DE DE602006006594T patent/DE602006006594D1/de not_active Expired - Fee Related
- 2006-12-01 DK DK06841839T patent/DK1957850T3/da active
- 2006-12-01 AT AT06841839T patent/ATE430280T1/de not_active IP Right Cessation
- 2006-12-01 EP EP06841839A patent/EP1957850B1/fr not_active Not-in-force
- 2006-12-01 US US12/096,518 patent/US20080289879A1/en not_active Abandoned
- 2006-12-01 WO PCT/FR2006/002629 patent/WO2007065986A1/fr active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2007065986A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP1957850B1 (fr) | 2009-04-29 |
FR2894279B1 (fr) | 2010-08-27 |
WO2007065986A1 (fr) | 2007-06-14 |
US20080289879A1 (en) | 2008-11-27 |
FR2894279A1 (fr) | 2007-06-08 |
DK1957850T3 (da) | 2009-08-24 |
ATE430280T1 (de) | 2009-05-15 |
DE602006006594D1 (de) | 2009-06-10 |
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