EP2898172B1 - System for oil and gas exploration and production drilling - Google Patents
System for oil and gas exploration and production drilling Download PDFInfo
- Publication number
- EP2898172B1 EP2898172B1 EP13839937.3A EP13839937A EP2898172B1 EP 2898172 B1 EP2898172 B1 EP 2898172B1 EP 13839937 A EP13839937 A EP 13839937A EP 2898172 B1 EP2898172 B1 EP 2898172B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- drill
- line
- string
- power
- signal line
- 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.)
- Active
Links
- 238000005553 drilling Methods 0.000 title claims description 29
- 238000004519 manufacturing process Methods 0.000 title claims description 4
- 239000012530 fluid Substances 0.000 claims description 14
- 230000000295 complement effect Effects 0.000 claims 1
- 238000009434 installation Methods 0.000 description 13
- 238000004891 communication Methods 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010924 continuous production Methods 0.000 description 2
- 238000011010 flushing procedure Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 230000003534 oscillatory effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Images
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
- E21B17/046—Couplings; joints between rod or the like and bit or between rod and rod or the like with ribs, pins, or jaws, and complementary grooves or the like, e.g. bayonet catches
-
- 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
-
- 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
-
- 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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
- E21B33/068—Well heads; Setting-up thereof having provision for introducing objects or fluids into, or removing objects from, wells
Definitions
- a system for exploration and production drilling for oil and gas or other fluids to be recovered from bedrock including a non-rotatable drill string formed from several connectable drill-string sections, a bottom-hole assembly provided with a rotatable drill bit connected to a drill-bit drive, the drill string being provided with first and second line grooves arranged to receive, respectively, a fluid line and a power and signal line.
- Drilling oil and gas wells has become constantly more challenging with respect to both directional control and communication between downhole equipment and a surface installation.
- the demand for efficiency and profitability is increasing as well.
- drilling operations are substantially carried out with equipment in which a drill string that consists of sections of pipe connections screwed together is rotating in its entire length.
- the rotation of the drill string is transmitted to a drill bit, and drilling fluid is supplied through a centric hole in the drill string and carries cuttings away from the drill bit and out of the borehole through an annulus formed between the drill string and the borehole, possibly between the drill string and a surrounding casing or riser.
- the drill bit is rotated by a motor that sits between the drill string and the drill bit, for example by deviation drilling in horizontal well portions.
- US5092411 A discloses a drilling apparatus used for drilling shot holes, with a carriage for advancing and withdrawing the drilling rod that comprises a plurality of sections, an advance system, a pressure-operated drive system for the drilling rod, a flushing head that is arranged on the carriage, which can be moved either with or apart from the drilling rods, and a hydraulically operated in-hole hammer that is arranged on the front end of the drilling rod.
- the compressed air operated drive for the drilling rods transmits a back and forth oscillatory movement to the drilling rods.
- the drilling rods have two longitudinal channels that are open to the outside, and which serve to accommodate the hoses used for the feed and return lines for the hydraulic oil for the in-hole hammer. Flushing air is supplied through the hollow drilling rods.
- the transfer of torque to the drilling rods is effected by an interlocking shape-fit preferably through profiling of the drilling rods, or by a force fit.
- the invention has for its object to remedy or reduce at least one of the drawbacks of the prior art or at least provide a useful alternative to the prior art.
- the object is achieved through features, which are specified in the description below and in the claims that follow.
- the invention provides a system for exploration and production drilling for oil and gas or other fluids, which are to be recovered from bedrock. From a drilling rig, an assembled, non-rotating drill string is fed in a conventional manner known per se.
- the drill string is extendable and is made up of several drill-string sections and provides several, longitudinal, continuous grooves, which can accommodate fluid-, power- and signal-transferring lines extending between a surface installation and a bottom-hole assembly.
- the bottom-hole assembly includes a drill-bit drive, preferably an electric motor, which, by a stator, is non-rotatably connected to the drill string, and a rotor is connected to the drill bit in order thereby to provide rotation of the drill bit relative to the drill string.
- the lines are inserted into their recesses from respective line drums, the supplies of fluid, power or control signals, possibly a return of a borehole data signal, running through suitable swivels, slip rings, optical transmissions and so on between the static and rotating parts of a drum unit.
- drilling fluid is pumped continuously through a fluid line to the drill bit, which is rotated by means of the drill-bit drive, preferably by the supply of electrical power to an electromotor.
- connection and feeding equipment is arranged, which makes it possible for drill-string sections to be connected and fed into the borehole in an approximately continuous process.
- the lines for drilling mud, power and signal transmission are inserted into the respective grooves in the drill string in a continuous process.
- the drill string is lowered and lifted by means of a chain structure with two continuous, electrically or hydraulically operated chains.
- the chains are pressed against the drill string by hydraulic cylinders to achieve sufficient friction.
- the drill-string sections are connected by means of drill-string connections, which are locked in the connected position by means of one or more locking elements at each joint.
- the invention relates, more specifically, to a system according to claim 1.
- the drill string connection may include a locking element.
- the power and signal line may be formed of a separate power line and a separate signal line.
- the power and signal line may be formed of a separate power line and a separate signal line, the power line being partially accommodated in a groove in the signal line.
- the lines 36a, 36b are passed through sealing stuffing boxes 231, 232 in a feeder 23 into abutment in their respective line grooves 34a, 34b.
- the feeding device 22 for the drill string 3 works synchronously with the feeder 23 for the lines 36a, 36b.
- FIG 5 shows the feeding device 22 for the drill string 3 in greater detail.
- the feeding device 22 includes a stuffing box 221, which fits tightly against the drill string 3, and two feeding belts 222 bearing clampingly against the drill string 3.
- the clamping effect is provided by means of actuators, not shown, for example hydraulic cylinders, and ensures that the drill string 3 is held in a secure grip.
- FIG 8d shows an alternative exemplary embodiment of the power and signal line, it being formed of a separate power line 36ba and a separate signal line 36bb. In this embodiment, it is appropriate to provide the surface installation 1 with a further line drum (not shown) and the feeder 23 with a further stuffing box (not shown).
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
Description
- A system for exploration and production drilling for oil and gas or other fluids to be recovered from bedrock, including a non-rotatable drill string formed from several connectable drill-string sections, a bottom-hole assembly provided with a rotatable drill bit connected to a drill-bit drive, the drill string being provided with first and second line grooves arranged to receive, respectively, a fluid line and a power and signal line.
- Drilling oil and gas wells has become constantly more challenging with respect to both directional control and communication between downhole equipment and a surface installation. The demand for efficiency and profitability is increasing as well. According to the prior art in the field, drilling operations are substantially carried out with equipment in which a drill string that consists of sections of pipe connections screwed together is rotating in its entire length. The rotation of the drill string is transmitted to a drill bit, and drilling fluid is supplied through a centric hole in the drill string and carries cuttings away from the drill bit and out of the borehole through an annulus formed between the drill string and the borehole, possibly between the drill string and a surrounding casing or riser. In some situations, the drill bit is rotated by a motor that sits between the drill string and the drill bit, for example by deviation drilling in horizontal well portions.
- The rotation of drill strings up to several thousand metres long means that much power must be used for the operation. Hoisting a drill string weighing several hundred tonnes requires large and heavy hoisting machinery on the surface installation. In addition, the circulation of drilling mud must be interrupted when pipe sections are being joined together in the drill string. This gives discontinuous circulation and a risk of the drill string sticking in the borehole.
-
US5092411 A discloses a drilling apparatus used for drilling shot holes, with a carriage for advancing and withdrawing the drilling rod that comprises a plurality of sections, an advance system, a pressure-operated drive system for the drilling rod, a flushing head that is arranged on the carriage, which can be moved either with or apart from the drilling rods, and a hydraulically operated in-hole hammer that is arranged on the front end of the drilling rod. The compressed air operated drive for the drilling rods transmits a back and forth oscillatory movement to the drilling rods. The drilling rods have two longitudinal channels that are open to the outside, and which serve to accommodate the hoses used for the feed and return lines for the hydraulic oil for the in-hole hammer. Flushing air is supplied through the hollow drilling rods. The transfer of torque to the drilling rods is effected by an interlocking shape-fit preferably through profiling of the drilling rods, or by a force fit.
The invention has for its object to remedy or reduce at least one of the drawbacks of the prior art or at least provide a useful alternative to the prior art.
The object is achieved through features, which are specified in the description below and in the claims that follow.
The invention provides a system for exploration and production drilling for oil and gas or other fluids, which are to be recovered from bedrock. From a drilling rig, an assembled, non-rotating drill string is fed in a conventional manner known per se. The drill string is extendable and is made up of several drill-string sections and provides several, longitudinal, continuous grooves, which can accommodate fluid-, power- and signal-transferring lines extending between a surface installation and a bottom-hole assembly. The bottom-hole assembly includes a drill-bit drive, preferably an electric motor, which, by a stator, is non-rotatably connected to the drill string, and a rotor is connected to the drill bit in order thereby to provide rotation of the drill bit relative to the drill string.
As the drill string is paid out from the surface installation, the lines are inserted into their recesses from respective line drums, the supplies of fluid, power or control signals, possibly a return of a borehole data signal, running through suitable swivels, slip rings, optical transmissions and so on between the static and rotating parts of a drum unit.
During drilling, drilling fluid is pumped continuously through a fluid line to the drill bit, which is rotated by means of the drill-bit drive, preferably by the supply of electrical power to an electromotor. On the surface installation, connection and feeding equipment is arranged, which makes it possible for drill-string sections to be connected and fed into the borehole in an approximately continuous process. The lines for drilling mud, power and signal transmission are inserted into the respective grooves in the drill string in a continuous process. Preferably, the drill string is lowered and lifted by means of a chain structure with two continuous, electrically or hydraulically operated chains. The chains are pressed against the drill string by hydraulic cylinders to achieve sufficient friction.
The drill-string sections are connected by means of drill-string connections, which are locked in the connected position by means of one or more locking elements at each joint.
With the present invention, a drilling system that makes it possible to drill long boreholes with a non-rotating drill string with continuous communication between the drill bit and the surface installation is provided. This opens to the use of online communication for directional control and local seismology, and real-time data transmission concerning the conditions in the borehole. - The invention relates, more specifically, to a system according to
claim 1. The drill string connection may include a locking element.
The power and signal line may be formed of a separate power line and a separate signal line. The power and signal line may be formed of a separate power line and a separate signal line, the power line being partially accommodated in a groove in the signal line.
In what follows, an example of a preferred embodiment is described, which is visualized in the accompanying drawings, in which: - Figure 1
- shows in perspective a surface installation in accordance with the invention;
- Figure 2
- shows a side view of the surface installation;
- Figure 3
- shows a front view of a lower part of the surface installation, in which a feeder for lines is illustrated;
- Figure 4
- shows, on a larger scale, a section of the feeder;
- Figure 5
- shows, on a smaller scale, a longitudinal section through a feeding device for a drill string in accordance with the invention;
- Figure 6a
- shows a side view of a portion of a drill string around a drill-string joint;
- Figure 6b
- shows a
cross section 6b-6b through the drill-string joint according tofigure 6a ; - Figure 7
- shows a side view of an early stage in the connection of a drill-string section and the drill string;
- Figure 8a
- shows a side view of a drill string provided with lines;
- Figure 8b
- shows a
cross section 8b-8b through the drill string according tofigure 8a ; - Figure 8c
- shows a
cross section 8c-8c through the drill string according tofigure 8a ; - Figure 8d
- shows a
cross section 8c-8c through the drill string according tofigure 8a with an alternative embodiment of the power and signal line, the two having being separated into a power line and a signal line; and - Figure 9
- shows a longitudinal section 9-9 through the drill string according to
figure 8a . - The
lines stuffing boxes feeder 23 into abutment in theirrespective line grooves feeding device 22 for thedrill string 3 works synchronously with thefeeder 23 for thelines
Reference is now made tofigure 5 , which shows thefeeding device 22 for thedrill string 3 in greater detail. Thefeeding device 22 includes astuffing box 221, which fits tightly against thedrill string 3, and two feedingbelts 222 bearing clampingly against thedrill string 3. The clamping effect is provided by means of actuators, not shown, for example hydraulic cylinders, and ensures that thedrill string 3 is held in a secure grip. - The
stuffing boxes riser 4 cannot escape into the surroundings through thefeeding device 22 and thefeeder 23.
Figure 8d shows an alternative exemplary embodiment of the power and signal line, it being formed of a separate power line 36ba and a separate signal line 36bb. In this embodiment, it is appropriate to provide thesurface installation 1 with a further line drum (not shown) and thefeeder 23 with a further stuffing box (not shown).
Reference is now made to
Claims (4)
- A system for exploration and production drilling for oil and gas or other fluids that are to be recovered from bedrock, including a non-rotatable drill string (3) formed from several connectable drill-string sections (31, 31a, 31b), a bottom-hole assembly (37) provided with a rotatable drill bit (37a) connected to a drill-bit drive (37b), the drill string (3) being provided with first and second line grooves (34a, 34b) arranged to receive, respectively, a fluid line (36a) and a power and signal line (36b), characterised in that at their respective end portions,
the drill-string sections (31, 31a, 31b) are provided with an asymmetric drill-string connection (32) of the groove and tongue type, a groove (321) and a matching complementary tongue (322) being connectable by sliding the drill string section (31, 31a, 31b) transverse of the drill string's (3) axial direction, wherein a drilling rig (2) is provided with a line feeder (23) and stuffing boxes (231, 232) arranged for passing the fluid line (36a) and the power and signal line (36b) from the line feeder (23) into abutment in the respective line grooves (34a, 34b) of the drill string (3). - The system in accordance with claim 1, wherein the drill-string connection (32) includes a locking element (33).
- The system in accordance with claim 1, wherein the power and signal line (36b) is formed from a separate power line (36ba) and a separate signal line (36bb).
- The system in accordance with claim 1, wherein the power and signal line (36b) is formed from a separate power line (36ba) and a separate signal line (36bb), the power line (36ba) partially being accommodated in a groove (36bc) in the signal line (36bb).
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NO20121063 | 2012-09-18 | ||
NO20131157A NO342845B1 (en) | 2012-09-18 | 2013-08-30 | Exploration and production drilling system for oil and gas |
PCT/NO2013/050157 WO2014046548A1 (en) | 2012-09-18 | 2013-09-16 | System for oil and gas exploration and production drilling |
Publications (3)
Publication Number | Publication Date |
---|---|
EP2898172A1 EP2898172A1 (en) | 2015-07-29 |
EP2898172A4 EP2898172A4 (en) | 2016-06-08 |
EP2898172B1 true EP2898172B1 (en) | 2017-11-15 |
Family
ID=50341734
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP13839937.3A Active EP2898172B1 (en) | 2012-09-18 | 2013-09-16 | System for oil and gas exploration and production drilling |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2898172B1 (en) |
NO (1) | NO342845B1 (en) |
WO (1) | WO2014046548A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NO20150994A1 (en) * | 2014-10-29 | 2016-05-02 | Norhard Oil & Gas As | Apparatus for plugging a hydrocarbon well |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1331776A (en) * | 1918-07-15 | 1920-02-24 | Daniel L Lewis | Rod-coupling |
DE3842081A1 (en) * | 1988-03-15 | 1989-09-28 | Hausherr & Soehne Rudolf | DRILLING DEVICE |
US5950744A (en) * | 1997-10-14 | 1999-09-14 | Hughes; W. James | Method and apparatus for aligning drill pipe and tubing |
US20110180273A1 (en) * | 2010-01-28 | 2011-07-28 | Sunstone Technologies, Llc | Tapered Spline Connection for Drill Pipe, Casing, and Tubing |
-
2013
- 2013-08-30 NO NO20131157A patent/NO342845B1/en unknown
- 2013-09-16 EP EP13839937.3A patent/EP2898172B1/en active Active
- 2013-09-16 WO PCT/NO2013/050157 patent/WO2014046548A1/en active Application Filing
Non-Patent Citations (1)
Title |
---|
None * |
Also Published As
Publication number | Publication date |
---|---|
NO20131157A1 (en) | 2014-03-19 |
EP2898172A4 (en) | 2016-06-08 |
NO342845B1 (en) | 2018-08-20 |
EP2898172A1 (en) | 2015-07-29 |
WO2014046548A1 (en) | 2014-03-27 |
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