US20050199427A1 - Drilling on gauge sub - Google Patents
Drilling on gauge sub Download PDFInfo
- Publication number
- US20050199427A1 US20050199427A1 US11/075,952 US7595205A US2005199427A1 US 20050199427 A1 US20050199427 A1 US 20050199427A1 US 7595205 A US7595205 A US 7595205A US 2005199427 A1 US2005199427 A1 US 2005199427A1
- Authority
- US
- United States
- Prior art keywords
- drilling
- cavities
- tubular housing
- gauge sub
- face
- 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.)
- Abandoned
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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
- 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
- E21B17/1057—Centralising devices with rollers or with a relatively rotating sleeve
-
- 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
- E21B17/1092—Gauge section of drill bits
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)
- Drilling And Boring (AREA)
- Earth Drilling (AREA)
Abstract
A drilling on gauge sub including a tubular housing having a first end, a second end and an exterior surface. Coupling means are positioned at both the first end and the second end of the tubular housing to couple the tubular housing to other components of a drill string. At least three cavities are provided in the exterior surface of the tubular housing. Each of the cavities having a first end and a second end. Reamer cutters are secured within each of the at least three cavities. The reamer cutters including cutters mounted on rotatably mounted rollers.
Description
- The present invention relates to a drilling on gauge sub.
- As a drill bit wears during drilling, the hole it makes becomes undergauged. When the hole is undergauged there is a danger that the drill string behind the bit will become stuck. In order to minimize the amount of undergauged hole, a sub having reamer cutters is positioned directly behind the drill bit. As the drill bit wears, the reamer cutters of the drilling on gauge sub enlarge the hole made by the drill bit to keep the hole “on gauge”. When the drill bit is replaced due to wear, the drilling on gauge sub is also replaced due to wear of the reamer cutters. A problem currently being experienced when drilling on gauge is high torque loading. This torque loading can become so severe as to result in the drill string becoming stuck in the hole.
- What is required is a drilling on gauge sub that will not create as much torque loading of the drill string.
- According to the present invention therefore provided a drilling on gauge sub which includes a tubular housing having a first end, a second end and an exterior surface. Coupling means are positioned at both the first end and the second end of the tubular housing to couple the tubular housing to other components of a drill string. At least three cavities are provided in the exterior surface of the tubular housing. Each of the cavities having a first end and a second end. Reamer cutters are secured within each of the at least three cavities. The reamer cutters including cutters mounted on rotatably mounted rollers.
- With the drilling on gauge sub, as described above, the rollers serve as a bearing surface which guides the bit on the downhole drilling motor. This greatly reduces the torque required to drilling a gauged hole with a downhole drilling motor.
- BRIEF DESCRIPTION OF THE DRAWINGS
- These and other features of the invention will become more apparent from the following description in which reference is made to the appended drawings, the drawings are for the purpose of illustration only and are not intended to in any way limit the scope of the invention to the particular embodiment or embodiments shown, wherein:
-
FIG. 1 is a side elevation view, in section, of a drilling on gauge sub constructed in accordance with the teachings of the invention; -
FIG. 2 is a side elevation view of a drill string to which the drilling on gauge sub illustrated inFIG. 1 is coupled; -
FIG. 3 is a side elevation view in section of a reamer cutter module from the drilling on gauge sub illustrated inFIG. 1 ; -
FIG. 4 is a side elevation view, in section, of the drilling on gauge sub illustrated inFIG. 1 , with the reamer cutter module removed; and -
FIG. 5 is an end view, in section, of the drilling on gauge sub illustrated inFIG. 1 . - The preferred embodiment, a drilling on gauge sub generally identified by
reference numeral 10, will now be described with reference toFIGS. 1 through 5 . - Structure and Relationship of Parts:
- Referring now to
FIG. 1 , drilling ongauge sub 10 has atubular housing 12 with afirst end 14, asecond end 16 and anexterior surface 18. At bothfirst end 14 andsecond end 16 ofhousing 12, there is coupling means 20 to coupletubular housing 12 to other components of adrill string 100.FIG. 2 showsdrill string 100 with drilling ongauge sub 10 connected in line. Referring toFIG. 5 , there are threecavities 22 inexterior surface 18 oftubular housing 12. Referring toFIG. 4 , eachcavity 22 has afirst end 24 and asecond end 25. Atfirst end 24 ofcavity 22, there is anundercut locking groove 26. At least threereamer cutter modules 28, are provided to be installed incavity 22, where, referring toFIG. 1 , eachreamer cutter module 28 has afirst end 30 and asecond end 32.First end 30 ofreamer cutter module 28 has a projectingtongue 34 adapted to engagelocking groove 26 ofcavity 22. This arrangement allowsreamer cutter module 28 to be inserted intocavity 22, withfirst end 30 secured bylocking groove 26, whilesecond end 32 ofreamer cutter module 28 is secured bydetachable fasteners 36 withinsecond end 25 ofcavity 22. This is done such that projectingtongue 34 of eachreamer cutter module 28 remains locked in engagement withlocking groove 26, and such that eachreamer cutter module 28 is field replaceable by detachingfastener 36 and withdrawing projectingtongue 34 fromlocking groove 26.Reamer cutter modules 28 includepins 29 to help keep the assembly together during installation and replacement. -
Detachable fasteners 36 arebolts 38 which engage threadedapertures 40 intubular housing 12. Adebris cover 40 may also be positioned over eachbolt 38 which is adapted to shieldbolt 38 fromdebris 42, shown inFIG. 2 . Again referring toFIG. 1 , debriscover 41 may be held in place by aspring pin 44. - Referring now to
FIG. 3 ,reamer cutter module 28 is shown to includecutters 46 rotatably mounted onrollers 48.Rollers 48 are cylindrical rollers oriented substantially parallel to thelongitudinal axis 50 oftubular housing 12.Carbide spacers 52 are positioned at eachend 54 ofcylindrical rollers 48 to serve as wear surfaces and transmit axial loads.Rollers 48 rotate onradial bearings 56, which are positioned within a lubricant filledbearing chamber 58 withseals 60 positioned at eachend 62 ofbearing chamber 58 to containlubricant 66. Alubricant supply passage 68 is in communication withbearing chamber 58 with apiston 70 positioned inlubricant supply passage 68. Piston 70 has afirst face 72 and asecond face 74.First face 72 engageslubricant 66 contained withinlubricant supply passage 68.Second face 74 is exposed to pressure from drilling fluids such that the pressure exerted uponsecond face 74 ofpiston 70 causespiston 70 to move inlubricant supply passage 68 withfirst face 72 ofpiston 70urging lubricant 66 intobearing chamber 58. - Operation:
- The use of drilling on
gauge sub 10 will now be discussed with reference to FIGS. 1 to 5. Referring now toFIG. 1 ,reamer cutter modules 28 are installed inhousing 12. Referring toFIG. 2 , drilling ongauge sub 10 is coupled by coupling means 20 intodrill string 100. During drilling, drilling ongauge sub 10 ensures that thehole 78 drilled is the proper gauge.Rollers 48 serve as a bearing surface which reduces friction while guiding the drill bit of the downhole drilling motor. Referring again toFIG. 1 , whenreamer cutter modules 28 are to be replaced, such as when they are worn, or during a regular maintenance schedule, they are removed by removingdebris cover 40 held in place byspring pin 44 and then removingbolt 38.First end 30 ofreamer cutter module 28 is then free to be removed by disengaging projectingtongue 34 fromlocking groove 26. Anotherreamer cutter module 28 may then be installed by reversing the procedure. - The drawings accompanying this application illustrate three cavities. It will be appreciated that there could be more than three cavities—with configurations of four, five, six, etc. The drawings accompanying this application illustrate one type of cutter. It will be appreciated by one skilled in the art that different cutters are used for hard formations than for soft formations. Since the tool is field serviceable, it may be desirable to switch to different types of cutters when the tool is used in different formations. Alternatively, one can have an even number of cavities (four, six, or eight) with the cutters alternating around the circumference of the tool between hard formation cutters and soft formation cutters. This alternating configuration would be suitable for both soft and hard formations.
- In this patent document, the word “comprising” is used in its non-limiting sense to mean that items following the word are included, but items not specifically mentioned are not excluded. A reference to an element by the indefinite article “a” does not exclude the possibility that more than one of the element is present, unless the context clearly requires that there be one and only one of the elements.
- It will be apparent to one skilled in the art that modifications may be made to the illustrated embodiment without departing from the spirit and scope of the invention as hereinafter defined in the Claims.
Claims (17)
1. A drilling on gauge sub, comprising:
a tubular housing having a first end, a second end and an exterior surface;
coupling means at both the first end and the second end of the tubular housing to couple the tubular housing to other components of a drill string;
at least three cavities in the exterior surface of the tubular housing, each of the cavities having a first end and a second end;
reamer cutters positioned in each of the at least three cavities, the reamer cutters including cutters mounted on rotatably mounted rollers.
2. The drilling on gauge sub as defined in claim 1 , wherein the reamer cutters are in the form of replaceable modules detachably secured in the cavities by fasteners.
3. The drilling on gauge sub as defined in claim 2 , wherein
an undercut locking groove is positioned at the first end of each of the cavities;
each reamer cutter module having a first end and a second end, the first end the each reamer cutter module having a projecting tongue adapted to engage the locking groove of one of the cavities;
detachable fasteners securing the second end of each of the reamer cutter modules within the second end of one of the cavities so that the projecting tongue of each reamer cutter module remains locked in engagement with the locking groove, each reamer cutter module being replaceable by detaching the fastener and withdrawing the projecting tongue from the locking groove.
4. The drilling on gauge sub as defined in claim 1 , wherein the rollers are cylindrical rollers oriented substantially parallel to the longitudinal axis of the tubular housing.
5. The drilling on gauge sub as defined in claim 4 , wherein carbide spacers are positioned at each end of the cylindrical rollers to serve as wear surfaces and transmit axial loads.
6. The drilling on gauge sub as defined in claim 3 , wherein the detachable fasteners are bolts which engage threaded apertures in the tubular housing.
7. The drilling on gauge sub as defined in claim 6 , wherein a debris cover is positioned over each of the bolts, the debris cover being adapted to shield the bolt from debris.
8. The drilling on gauge sub as defined in claim 7 , wherein each debris cover is held in place by spring pins.
9. The drilling on gauge sub as defined in claim 1 , wherein the rollers rotate on radial bearings.
10. The drilling on gauge sub as defined in claim 9 , wherein the radial bearings are positioned within a lubricant filled bearing chamber with seals being positioned at each end of the bearing chamber to contain lubricant.
11. The drilling on gauge sub as defined in claim 10 , wherein a lubricant supply passage communicates with the bearing chamber, a piston being positioned in the lubricant supply passage, the piston having a first face and a second face, the first face engaging lubricant contained within the lubricant supply passage, the second face being exposed to pressure from drilling fluids, such the pressure; exerted upon the second face of the piston causes the piston to move in the lubricant supply passage with the first face of the piston urging lubricant into the bearing chamber.
12. A drilling on gauge sub, comprising:
a tubular housing having a first end, a second end and an exterior surface;
a first coupling at the first end and a second coupling at the second end of the tubular housing, the first coupling and the second coupling being adapted to couple the tubular housing to other components of a drill string;
more than two cavities in the exterior surface of the tubular housing, each of the cavities having a first end and a second end, an undercut locking groove being positioned at the first end of each of the cavities;
replaceable reamer cutter modules detachably positioned in the cavities, each reamer cutter module having a first end and a second end, the first end the each reamer cutter module having a projecting tongue adapted to engage the locking groove of one of the cavities, detachable fasteners securing the second end of each of the reamer cutter modules within the second end of one of the cavities so that the projecting tongue of each reamer cutter module remains locked in engagement with the locking groove, each reamer cutter module being replaceable by detaching the fastener and withdrawing the projecting tongue from the locking groove, each reamer cutter module including rotatably mounted cylindrical rollers which rotate on radial bearings and are oriented substantially parallel to the longitudinal axis of the tubular housing, cutters projecting from and being spaced around the outer circumference of the rollers;
the radial bearings being positioned within a lubricant filled bearing chamber with seals being positioned at each end of the bearing chamber to contain lubricant; and
a lubricant supply passage communicates with the bearing chamber, a piston being positioned in the lubricant supply passage, the piston having a first face and a second face, the first face engaging lubricant contained within the lubricant supply passage, the second face being exposed to pressure from drilling fluids, such the pressure; exerted upon the second face of the piston causes the piston to move in the lubricant supply passage with the first face of the piston urging lubricant into the bearing chamber.
13. The drilling on gauge sub as defined in claim 12 , wherein carbide spacers are positioned at each end of the cylindrical rollers to serve as wear surfaces and transmit axial loads.
14. The drilling on gauge sub as defined in claim 12 , wherein the detachable fasteners are bolts which engage threaded apertures in the tubular housing.
15. The drilling on gauge sub as defined in claim 14 , wherein a debris cover is positioned over each of the bolts, the debris cover being adapted to shield the bolt from debris.
16. The drilling on gauge sub as defined in claim 15 , wherein each debris cover is held in place by spring pins.
17. A method of drilling on gauge with a downhole drilling motor assembly, comprising the steps of:
securing a drilling on gauge sub having rollers on which are secured cutters adjacent to a drill bit end of the downhole drilling motor assembly; and
using the cutters to ream the hole, while the rollers concurrently guide the movement of the drilling motor assembly and reduce friction with the hole.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA2,461,082 | 2004-03-09 | ||
CA002461082A CA2461082A1 (en) | 2004-03-09 | 2004-03-09 | Drilling on gauge sub |
Publications (1)
Publication Number | Publication Date |
---|---|
US20050199427A1 true US20050199427A1 (en) | 2005-09-15 |
Family
ID=34916938
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/075,952 Abandoned US20050199427A1 (en) | 2004-03-09 | 2005-03-09 | Drilling on gauge sub |
Country Status (2)
Country | Link |
---|---|
US (1) | US20050199427A1 (en) |
CA (1) | CA2461082A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20140014366A1 (en) * | 2011-03-30 | 2014-01-16 | Welltec A/S | Downhole driving unit having a hydraulic motor with a static cam ring |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA2510287C (en) | 2005-06-13 | 2010-01-05 | William R. Wenzel | Method of securing a rotary cutter to a body of a down hole tool and a rotary cutter assembly |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4398610A (en) * | 1978-05-08 | 1983-08-16 | Grey Bassinger | Roller reamer apparatus |
US4561508A (en) * | 1980-08-01 | 1985-12-31 | Hughes Tool Company | Roller-reamer |
US4765417A (en) * | 1986-08-04 | 1988-08-23 | Oil Patch Group Inc. | Reaming apparatus for well drilling |
US4793425A (en) * | 1985-06-26 | 1988-12-27 | White Kenneth M | Profiled body roller-reamer stabilizer |
US5381868A (en) * | 1993-10-08 | 1995-01-17 | Triumph*Lor Inc | Sealed bearing roller reamer |
US6213229B1 (en) * | 1998-10-13 | 2001-04-10 | Smith International Canada Limited | Drilling motor drill bit reaming stabilizer |
US20050252694A1 (en) * | 2002-11-07 | 2005-11-17 | Kennedy John F | Rotary roller reamer |
-
2004
- 2004-03-09 CA CA002461082A patent/CA2461082A1/en not_active Abandoned
-
2005
- 2005-03-09 US US11/075,952 patent/US20050199427A1/en not_active Abandoned
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4398610A (en) * | 1978-05-08 | 1983-08-16 | Grey Bassinger | Roller reamer apparatus |
US4561508A (en) * | 1980-08-01 | 1985-12-31 | Hughes Tool Company | Roller-reamer |
US4793425A (en) * | 1985-06-26 | 1988-12-27 | White Kenneth M | Profiled body roller-reamer stabilizer |
US4765417A (en) * | 1986-08-04 | 1988-08-23 | Oil Patch Group Inc. | Reaming apparatus for well drilling |
US5381868A (en) * | 1993-10-08 | 1995-01-17 | Triumph*Lor Inc | Sealed bearing roller reamer |
US6213229B1 (en) * | 1998-10-13 | 2001-04-10 | Smith International Canada Limited | Drilling motor drill bit reaming stabilizer |
US20050252694A1 (en) * | 2002-11-07 | 2005-11-17 | Kennedy John F | Rotary roller reamer |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20140014366A1 (en) * | 2011-03-30 | 2014-01-16 | Welltec A/S | Downhole driving unit having a hydraulic motor with a static cam ring |
US9708866B2 (en) * | 2011-03-30 | 2017-07-18 | Welltec A/S | Downhole driving unit having a hydraulic motor with a static cam ring |
Also Published As
Publication number | Publication date |
---|---|
CA2461082A1 (en) | 2005-09-09 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |