EP1811126A1 - Conical downhole reamer - Google Patents
Conical downhole reamer Download PDFInfo
- Publication number
- EP1811126A1 EP1811126A1 EP06001057A EP06001057A EP1811126A1 EP 1811126 A1 EP1811126 A1 EP 1811126A1 EP 06001057 A EP06001057 A EP 06001057A EP 06001057 A EP06001057 A EP 06001057A EP 1811126 A1 EP1811126 A1 EP 1811126A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- stabilizer
- reamer
- drill string
- hole
- drilling
- 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- Withdrawn
Links
- 239000003381 stabilizer Substances 0.000 claims abstract description 28
- 238000005553 drilling Methods 0.000 claims abstract description 19
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 14
- 239000003129 oil well Substances 0.000 claims abstract description 4
- 238000005755 formation reaction Methods 0.000 claims description 13
- 230000008901 benefit Effects 0.000 claims description 4
- 230000003993 interaction Effects 0.000 claims description 2
- 230000008961 swelling Effects 0.000 claims description 2
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 claims 3
- 230000020169 heat generation Effects 0.000 claims 1
- 239000000463 material Substances 0.000 claims 1
- 230000000087 stabilizing effect Effects 0.000 abstract description 5
- 239000012530 fluid Substances 0.000 abstract description 3
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
Images
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
- E21B17/10—Wear protectors; Centralising devices, e.g. stabilisers
-
- 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
- E21B10/00—Drill bits
- E21B10/26—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
Definitions
- the present invention relates to a Stabilizer with Front Reamer to be used to stabilize a drilling String during operation.
- the Stabilizer with Front Reamer of the present invention is directed to an arrangement that will stabilize the drilling string and at the same time to gauge the drilled hole to size.
- the flexibility of this invention allows for increasing or decreasing the front hole gauging capacity according to need.
- Stabilizer with front reaming is to provide two main functions:
- the first function provided by the described device is to act as a reamer.
- Reamer part is to cut formations to enlarge the bore hole to the desired size, which may be the original size of the bit in the case the drill bit wears to be under-gauged.
- reamers are employed to cut formations because the bit does not always drill a true circular bore hole and because of slight lateral shifting inherent in the drilling operation; that shifting leaves ledges and other distortions along the bore.
- Another need for a reamer is due to the interaction of drilling mud with the earth formation; which leads to formation swelling and hence diameter reduction.
- the second function of this device is to keep the drill stem in the centre of the hole, which means the device acts as a stabilizer.
- Stabilizers are positioned above the drill bit to ensure that the drill bit - stabilizer assembly drill a straight hole of the desired diameter. Maintaining the drill stem centered has many benefits. The primary benefit is to minimize unintentional hole-angle directional drilling.
- a stabilizer thereby extends the life of the drill bit by confining the drill string movement into the original hole size.
- the present invention provides the public with an alternative to existing reamers.
- a reamer for use in association with a stabilizing element to the drill stem and a drill bit in drilling a hole in a rock formation said stabilizer with front reaming (1) having:-
- the reamer By arranging hard reaming carbide inserts (8) along the length of the conical body, the reamer is thus is use, brought to bear against the drilled hole-wall at circumferentially spaced positions. The surface of the reamer rubs against the hole-wall thereby ensuring to ream hole back to gauge.
- said wear surfaces are all studded with a plurality of hardwearing studs, for example carbide surface studs.
- the stabilizer with front reaming of the present invention may be embodied as either a near bit stabilizer reamer in which the reamer part is adjacent the drill bit in use, or alternatively as a string Stabilizer reamer in which the reaming part is spaced along the drilling string from the drill bit.
- said spaced apart, axially extending spiral flutes cut into said outer surface are cut at a low angle relative to thereby minimize the extent of helical movement in fluid moving along the flutes.
- the spaced apart axially and spirally extending spiral flutes cut into said outer surface are milled out, and the distance between adjacent axially spaced wear surfaces are arranged such that, around the circumference of the reamer, a wear surface engages the surrounding hole wall at some point.
Abstract
- Outside of said body, it has a lower tapered part that holds hard reaming carbide buttons to ream the hole back to size. Above the tapered part is a straight stabilizing part which constrains and holds the drill string steady during the drilling operation.
Description
- The present invention relates to a Stabilizer with Front Reamer to be used to stabilize a drilling String during operation. The Stabilizer with Front Reamer of the present invention is directed to an arrangement that will stabilize the drilling string and at the same time to gauge the drilled hole to size. The flexibility of this invention allows for increasing or decreasing the front hole gauging capacity according to need.
- Both reamers and stabilizers have traditionally been employed in oil well drilling operations for the petroleum industry. Stabilizer with front reaming is to provide two main functions:
- The first function provided by the described device is to act as a reamer. Reamer part is to cut formations to enlarge the bore hole to the desired size, which may be the original size of the bit in the case the drill bit wears to be under-gauged. However, even for new bits, reamers are employed to cut formations because the bit does not always drill a true circular bore hole and because of slight lateral shifting inherent in the drilling operation; that shifting leaves ledges and other distortions along the bore. Another need for a reamer is due to the interaction of drilling mud with the earth formation; which leads to formation swelling and hence diameter reduction.
- The second function of this device is to keep the drill stem in the centre of the hole, which means the device acts as a stabilizer. Stabilizers are positioned above the drill bit to ensure that the drill bit - stabilizer assembly drill a straight hole of the desired diameter. Maintaining the drill stem centered has many benefits. The primary benefit is to minimize unintentional hole-angle directional drilling.
- A stabilizer thereby extends the life of the drill bit by confining the drill string movement into the original hole size.
- The present invention provides the public with an alternative to existing reamers.
- Therefore according to a first aspect of the present invention there is provided a reamer for use in association with a stabilizing element to the drill stem and a drill bit in drilling a hole in a rock formation, said stabilizer with front reaming (1) having:-
- a body having a through going bore (2) for passage of drilling fluids there through; said body having a conical lower part (3) adapted from connection to a drill string and a generally reamer part of diameter gradually smaller than said upper part, and
- said stabilizer part including plurality of wear surfaces (4),(5) located on an outer surface thereof that bear against a surrounding drill hole surface and a plurality of spaced apart, axially extending spiral flutes (6) cut into said outer surface; wherein said wear surfaces include two or more stabilizing bands (4),(5) axially spaced along the stabilizer part.
- The adoption of two or more bearing points, represented by the wear surfaces provides for stability in the position of the reamer and thereby the drill assembly. Preferably, stabilizing bands axially spaced along the stabilizer part are separated by a region of reduced diameter (7).
- By arranging hard reaming carbide inserts (8) along the length of the conical body, the reamer is thus is use, brought to bear against the drilled hole-wall at circumferentially spaced positions. The surface of the reamer rubs against the hole-wall thereby ensuring to ream hole back to gauge.
- Preferably, said wear surfaces are all studded with a plurality of hardwearing studs, for example carbide surface studs.
- The stabilizer with front reaming of the present invention may be embodied as either a near bit stabilizer reamer in which the reamer part is adjacent the drill bit in use, or alternatively as a string Stabilizer reamer in which the reaming part is spaced along the drilling string from the drill bit.
- Preferably, said spaced apart, axially extending spiral flutes cut into said outer surface are cut at a low angle relative to thereby minimize the extent of helical movement in fluid moving along the flutes.
- In a particularly preferred embodiment of the present invention the spaced apart axially and spirally extending spiral flutes cut into said outer surface are milled out, and the distance between adjacent axially spaced wear surfaces are arranged such that, around the circumference of the reamer, a wear surface engages the surrounding hole wall at some point.
- The above and other objects, features, and advantages of the present invention will be apparent from the following accompanying drawings. In the drawings:
- Figure (1) shows the outer profile of the tool. It shows a conical reaming part and two stabilizing bands.
- Figure (2) shows the tool after milling of the spiral flutes and insertion of wear inserts.
- Figure (3) shows a three dimensional representation of the final assembled device.
Claims (10)
- Stabilizers and Reamers are traditionally used in oil well drilling. These two tools are common in oil field drilling operations. The current invention relates to a new tool that can perform as a stabilizer for the drill string, and has a leading reamer that reams a wide range of diameters up to nominal bit size. The front Reamer is designed on a conical body.
- A stabilizer is used in oil well drilling. Said stabilizer includes an outer surface symmetrical to the axis of rotation; said outer surface is generally parallel to said axis of rotation; said surface also includes a plurality of hard carbide inserts or other hard material to slow down wear on the stabilizer outer surface due to continuous rotation of the drill string and the contact with the well walls.
- A stabilizer-Reamer body as in claims 1 and 2 wherein there are right hand spiral grooves, each having an angular width and they have a depth of several millimeters depending on the necessary mud flow required.
- Reamers are to cut formations to enlarge the bore hole to hole nominal size, which in most cases the original bit size, as in some cases the drill bit wears down to be under nominal size. However, even for new bits, reamers are employed to cut formations because the bit does not always drill a true circular bore hole because of slight lateral shifting inherent in the drilling operation; that shifting leaves ledges and other distortions along the bore. Another need for reamers is due to the interaction of drilling mud with the earth formation; which leads to formation swelling and hence hole diameter reduction.
- For the current invention, the reamer part is designed on a conical body as in claim 1 has the advantages of gradual engagement with the earth formation at any required rate - depending on the angle of the conical part - to ream the drilled hole, and open hole back to nominal size.
- Opening the drilled hole back to nominal diameter as in claim 3 eliminates and/or reduces the interference between the stabilizer part and the hole formations. This results in reduction of the required torque to rotate the drill string, and consequently reduces forces, and heat generation due to friction with the well walls.
- A Reamer conical section at the bottom of the stabilizer section wherein the surface converges at an angle generally varies according to required reaming capacity.
- A Reamer as in the above claim wherein hard dome tungsten carbide inserts are arranged circumferentially on the conical part around said axis of rotation.
- A Reamer conical part is to ensure gradual Reamer-Formation engagement and removal of excess or swollen formation.
- A reaming stabilizer for use in boreholes including;- a body having respective recesses helically cut around an axis of rotation- said Stabilizer having an outer surface symmetrical to the axis of rotation, said outer surface having a plurality of tungsten carbide inserts flush with the surface.- Said body has a conical part below the said stabilizer that has a polarity of arrangement of Tungsten carbide Domes protruding from the surface to gradually ream the drilled hole.A Stabilizer with front reaming capacity substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings is a new concept for reaming stabilizers.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP06001057A EP1811126A1 (en) | 2006-01-18 | 2006-01-18 | Conical downhole reamer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP06001057A EP1811126A1 (en) | 2006-01-18 | 2006-01-18 | Conical downhole reamer |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1811126A1 true EP1811126A1 (en) | 2007-07-25 |
Family
ID=36390214
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06001057A Withdrawn EP1811126A1 (en) | 2006-01-18 | 2006-01-18 | Conical downhole reamer |
Country Status (1)
Country | Link |
---|---|
EP (1) | EP1811126A1 (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2468781A (en) * | 2009-03-20 | 2010-09-22 | Turbopower Drilling Sal | Downhole drilling assembly |
US8162081B2 (en) | 2008-08-28 | 2012-04-24 | Varel International Ind., L.P. | Force balanced asymmetric drilling reamer and methods for force balancing |
GB2485857A (en) * | 2010-11-29 | 2012-05-30 | Arrival Oil Tools Inc | A down-hole reaming apparatus |
CN103306614A (en) * | 2013-06-27 | 2013-09-18 | 中国海洋石油总公司 | Open type spiral wing mud drum-preventing centralizer for well drilling |
CN110470507A (en) * | 2019-09-28 | 2019-11-19 | 缙云多图智能科技有限公司 | A kind of soil collection automatic counterboring device |
CN116641695A (en) * | 2023-07-26 | 2023-08-25 | 金石钻探(唐山)股份有限公司 | Self-adaptive drilling tool and drilling process |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2217592A (en) * | 1938-08-01 | 1940-10-08 | Lgs Devices Corp | Well reamer |
US3237705A (en) * | 1963-11-13 | 1966-03-01 | Williams Joseph W | Reamer for enlarging and straightening bore holes |
US3285678A (en) * | 1964-01-13 | 1966-11-15 | Drilco Oil Tool Inc | Drill collar stabilizer |
US4385669A (en) * | 1981-08-21 | 1983-05-31 | Paul Knutsen | Integral blade cylindrical gauge stabilizer reamer |
GB2133062A (en) * | 1982-12-03 | 1984-07-18 | Groom International Limited | Drilling tools |
US4610316A (en) * | 1984-11-23 | 1986-09-09 | Lor, Inc. | Free flow stabilizer |
GB2333542A (en) * | 1998-01-24 | 1999-07-28 | Downhole Products Plc | Tubing shoe with reaming members |
WO2004029402A1 (en) * | 2002-09-30 | 2004-04-08 | Transco Manufacturing Australia Pty Ltd | Combined reamer and drill bit stabiliser |
-
2006
- 2006-01-18 EP EP06001057A patent/EP1811126A1/en not_active Withdrawn
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2217592A (en) * | 1938-08-01 | 1940-10-08 | Lgs Devices Corp | Well reamer |
US3237705A (en) * | 1963-11-13 | 1966-03-01 | Williams Joseph W | Reamer for enlarging and straightening bore holes |
US3285678A (en) * | 1964-01-13 | 1966-11-15 | Drilco Oil Tool Inc | Drill collar stabilizer |
US4385669A (en) * | 1981-08-21 | 1983-05-31 | Paul Knutsen | Integral blade cylindrical gauge stabilizer reamer |
GB2133062A (en) * | 1982-12-03 | 1984-07-18 | Groom International Limited | Drilling tools |
US4610316A (en) * | 1984-11-23 | 1986-09-09 | Lor, Inc. | Free flow stabilizer |
GB2333542A (en) * | 1998-01-24 | 1999-07-28 | Downhole Products Plc | Tubing shoe with reaming members |
WO2004029402A1 (en) * | 2002-09-30 | 2004-04-08 | Transco Manufacturing Australia Pty Ltd | Combined reamer and drill bit stabiliser |
Non-Patent Citations (1)
Title |
---|
SMITH SERVICES: "Double Diamond Combo Tool", 2002, XP002382805, Retrieved from the Internet <URL:http://www.siismithservices.com/files/Stabilizer_-_Double_Diamond®_Combo_Tool_Product_Bulletin.pdf> [retrieved on 20050529] * |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8162081B2 (en) | 2008-08-28 | 2012-04-24 | Varel International Ind., L.P. | Force balanced asymmetric drilling reamer and methods for force balancing |
US9249630B2 (en) | 2009-03-20 | 2016-02-02 | Halliburton Energy Services, Inc. | Downhole drilling assembly |
GB2468781B (en) * | 2009-03-20 | 2011-12-28 | Halliburton Energy Serv Inc | Downhole drilling assembly |
GB2468781A (en) * | 2009-03-20 | 2010-09-22 | Turbopower Drilling Sal | Downhole drilling assembly |
US10119336B2 (en) | 2009-03-20 | 2018-11-06 | Halliburton Energy Services, Inc. | Downhole drilling assembly |
US9714543B2 (en) | 2009-03-20 | 2017-07-25 | Halliburton Energy Services, Inc. | Downhole drilling assembly |
GB2485857A (en) * | 2010-11-29 | 2012-05-30 | Arrival Oil Tools Inc | A down-hole reaming apparatus |
US9151118B2 (en) | 2010-11-29 | 2015-10-06 | Arrival Oil Tools, Inc. | Reamer |
GB2485857B (en) * | 2010-11-29 | 2013-02-20 | Arrival Oil Tools Inc | Reamer |
CN103306614B (en) * | 2013-06-27 | 2016-02-17 | 中国海洋石油总公司 | The anti-mud drum centralizer of the drilling well open type spiral wing |
CN103306614A (en) * | 2013-06-27 | 2013-09-18 | 中国海洋石油总公司 | Open type spiral wing mud drum-preventing centralizer for well drilling |
CN110470507A (en) * | 2019-09-28 | 2019-11-19 | 缙云多图智能科技有限公司 | A kind of soil collection automatic counterboring device |
CN116641695A (en) * | 2023-07-26 | 2023-08-25 | 金石钻探(唐山)股份有限公司 | Self-adaptive drilling tool and drilling process |
CN116641695B (en) * | 2023-07-26 | 2023-10-03 | 金石钻探(唐山)股份有限公司 | Self-adaptive drilling tool and drilling process |
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Legal Events
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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AK | Designated contracting states |
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AX | Request for extension of the european patent |
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17P | Request for examination filed |
Effective date: 20080104 |
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17Q | First examination report despatched |
Effective date: 20080229 |
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AKX | Designation fees paid |
Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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18D | Application deemed to be withdrawn |
Effective date: 20080711 |