US3400773A - Reaming tools for wells bored in the ground - Google Patents
Reaming tools for wells bored in the ground Download PDFInfo
- Publication number
- US3400773A US3400773A US527798A US52779866A US3400773A US 3400773 A US3400773 A US 3400773A US 527798 A US527798 A US 527798A US 52779866 A US52779866 A US 52779866A US 3400773 A US3400773 A US 3400773A
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- US
- United States
- Prior art keywords
- shaft
- reaming
- assembly
- elements
- axis
- 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.)
- Expired - Lifetime
Links
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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
- 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
- E21B10/28—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with non-expansible roller cutters
- E21B10/30—Longitudinal axis roller reamers, e.g. reamer stabilisers
Definitions
- a well reaming tool has a rotatable shaft with hubs thereon for the reamers. Adjacent hubs are connected by rings mounted on the shaft. A pair of eccentric socket elements at each end of each hub connects the hub to the adjacent rings.
- the present invention relates to tools for reaming a well or hole bored in the ground which are particularly suitable for use with boring equipment using a flexible tube at the lower end of which is suspended a bottom motor driving the boring tool.
- Reaming of a well or bore in the ground may be carried out during boring between descents of the boring tool or at the end of the boring operation before insertion of the tubing.
- reaming tools usually include a body having a shaft which is coupled to the lower end of a series of rigid drill pipes utilized in rotary drilling and including a number of rollers provided with cutting elements or abrading elements, these rollers being disposed in recesses formed in the periphery of the body of the reaming tool and rotating around axes parallel to the axis of the body, or more frequently, inclined with respect to said axis.
- the axes of these rollers are mounted on slide bearings and the diameter of the rollers is generally on the order of a third of that of the body of the reaming tool.
- Coupling of a reaming tool of this type to the rotor of a bottom motor having a speed of rotation of the order of one thousand to fifteen thousand revolutions per. minute provides a rotation of the rollers of between 3,000 and 4,500 revolutions per minute which is prohibitive when the rollers are mounted on slide bearings.
- a solution of this problem is provided by a reaming tool having ribs on the body of the tool, but such a construction requires a greater force to rotate it than can be absorbed by the flexible tubing except in a very limited range of types of ground and under conditions such that the points of contact of the ribs with the wall of the bore are so spaced and so irrigated as to reduce to a minimum the force necessary for rotation.
- annular rollers are provided around the body of the reaming tool at different levels thereof and are mounted for rotation around hubs fixed to the body of the reaming tool, the association of each roller with the corresponding hub constituting a reaming element, an assembly being provided in which the hubs of the different rollers are slightly eccentric with respect to the axis of the body of the reaming tool, with the axes of at least two of the rollers being angularly displaced with respect to each other.
- the hubs are preferably distributed at equal angular intervals about the axis of the body of the reaming tool in such a way as ice to distribute regularly the points of contact of the rollers on the wall of the bore.
- rollers then roll on the wall of the bore at the speed of rotation of the reaming tool which then acts as a crankshaft.
- a suitable assembly can be obtained by connecting the hubs of the consecutive reaming elements by coupling rings in which the hubs are screwed but it is very difficult in this way to obtain a correct relative angular positioning of the axes of the hubs around the axis of the body of the reaming tool.
- Another solution is the use of a shaft for the reaming tool on which eccentric hubs are mounted and the rollers turn on these hubs on axes parallel to the shaft with the hubs being fastened to the shaft for rotation either by keying on the shaft or by utilization of a shaft having a polygonal section.
- An object of the present invention is to provide a rigid assembly of reaming elements in which the transmission of the torque to these reaming elements is provided by the assembly itself which is solidly and directly connected to the driving shaft of the bottom motor which drives the tool in rotation.
- the hubs of the reaming elements of the tool are each provided with an internal bore to receive the shaft of the tool and are connected by rings having an internal bore for the shaft.
- the rings and hubs provide a pair of couples of socket elements eccentric with respect to each other, each couple including a male socket element and a female socket element.
- the hubs and the rings when mated form an assembly having an internal bore for housing the said shaft with a slight play.
- socket elements are such that when the assembly is mounted on the shaft the pairs of couples of socket elements are eccentrio in at least two different angular positions with respect to the axis of the shaft and are inclined to the axis of the shaft thus preventing any separation of the elements of the couples by reason of the fit of the shaft in the bore of the assembly.
- This assembly is driven at one of its extremities in rotation by the head of the shaft: which head transmits the torque directly to the assembly.
- FIG. 1 is a schematic view of an embodiment of the present invention having three reaming elements inclined to and eccentric with respect to the shaft of the reaming tool, with the elements being distributed over regular angular intervals around the shaft;
- FIGS. 1a, lb and 10 show, respectively, cross-sectional views of the tool of FIG. 1 perpendicular to the axis xy of the shaft on the lines a-a, b-b and c-c, showing the location of the contacts of the rollers with the wall of the well or bore;
- FIG. 2 shows a hub of a reaming element on a more reduced scale than the scale of the parts illustrated in the remaining figures;
- FIGS. 3a, 3b, 3c and 3d show the upper terminal ring connecting the hub of the upper reaming element with the head of the shaft, respectively, in elevation; in partial cross-section on the lines aa; in section on line bb as seen from above; and as seen from below;
- FIGS. 40:, 4b, 4c and 4d are corresponding views for intermediate rings connecting consecutive reaming elements.
- FIGS. a, 5b and 50 show the lower terminal ring of the reaming assembly.
- the upper part or head 1 of the reaming tool is fastened by conical threads 2 to a piece 3 fixed to the driving shaft of a bottom motor which is located at the lower end of a flexible tube, not shown,
- the lower part of the stator of the driving bottom motor is shown at 4.
- the cylindrical shaft 5 of the reaming tool is of monoblock construction and is formed as an extension of the head 1.
- An upper mounting ring 6 having the same axis xy as shaft 5 and including an internal bore 50 (FIGS. 3a to 3d) with the same axis xy.
- a first reaming element 78 the axis of which st is different from the axis xy of the shaft, this axis being offset and inclined with respect to axis xy.
- This reaming element comprises an annular roller 8 provided with teeth and mounted on hub 7 through bearings 9, the hub having a bore for shaft 5.
- An intermediate mounting ring 10 having an axis coincident with axis xy of shaft 5 and having an internal bore 51 with the same axis xy as shaft 5.
- a second reaming element 11-12 similar to the first one and having an axis ub, off-set by 120 to the right with respect to the first reaming element, as seen from the top toward the bottom of the axis xy of shaft 5.
- a third reaming element 1415 having an axis wz, similar to the two preceding reaming elements and off-set by 120 to the right with respect to reaming element 11-12.
- the tool assembly is formed by the successive mounting of the preceding elements on each other.
- the hubs of the reaming elements all three of which are identical, have an internal bore 63 for shaft 5 as seen in FIG. 2 and include at each of their extremities two male cylindrical shoulders with one shoulder being eccentric with respect to the other, as seen at 17 and 18 and at 19 and 20 for the hub 10 of the first reaming element, received, respectively, in two female sockets in the mounting ring (FIG. 2), the cooperation of the male shoulders of the hub and of the female shoulders of the rings providing pairs of couples of socket elements.
- the cylindrical male shoulders 18 and 20 have the same axis as the hub (i.e. st for the first smoothing element) and the cylindrical shoulders 17 and 19 located at the extremity of the hub have a smaller diameter than shoulders 18 and 20 and have axes parallel to the common axis of shoulders 18 and 20 but are eccentric with respect thereto.
- the female shoulders 48 and 49 which are formed in the upper support ring 6 for receiving male shoulders 17 and 18 of hub 7 have their axes inclined and eccentric with respect to the axis xy of the ring as seen in FIGS. 3a, 3b, 3c and 3d, the angle a of inclination being, for example, on the order from 3 to 4.
- the intermediate mounting ring 10 of FIGS. 4a to 4d provides at its upper portion a female socket element having two internal shoulders 53 and 54 having axes eccentric with respect to axis xy of the ring and inclined by the same angle a to this axis as seen in FIG. 4C.
- Hub 11 of the second reaming element has similar cylindrical male shoulders 45 and 46 at one of its extremities forming a socket assembly with female shoulders 55 and 56 formed in support ring 10.
- Female shoulders 55 and 56 are angularly displaced with respect to the analogous female shoulders 53 and 54 formed in the other extremity of ring 10 by an angle of with respect to axis xy of the ring.
- Intermediate mounting ring 13 is identical to intermediate ring 10 which is described above.
- the internal bores formed in the mounting rings have a diameter which is only slightly larger than that of shaft 5.
- Intermediate rings 10 and 13 are provided with guide shoes 64 (FIG. 40) for the shaft.
- Lower mounting ring 16 has two internal shoulders 57 and 58, as seen in FIGS. 5a, to 50, adapted to receive male socket elements located at the base of hub 14 of the third reaming element.
- Internal shoulders 57 and 58 have axes which are eccentric to and are inclined at the angle a, as described above, with respect to axis xy of ring 16.
- Mating the male shoulders of the hubs of the reaming elements in the corresponding female shoulders of the support rings provides an assembly in which the elements cannot turn with respect to each other because of the double socket construction.
- This assembly provides an internal longitudinal passage in which shaft 5 is mounted with slight play.
- the assembly is solidly fixed to head 1 of the shaft which is also the head of the reaming tool, in such a way that there is no substantial transmission of the torque of the bottom motor to the hubs through the shaft 5 itself, the required mechanical resistance of the shaft being therefore lower, so that the latter can be of a diameter smaller than that of head 1.
- the head of the shaft comprises two male shoulders 59 and 60 having axes parallel to the axis of the shaft and one of which is eccentric with respect to the other. These male shoulders cooperate with female shoulders 61 and 62 formed in the upper part of the terminal ring 6 as seen in FIGS. 3b, 3c in such a way as to drive the assembly in rotation with the head of the shaft. Further, in order to avoid any separation by longitudinal displacement between the head of the shaft and the assembly, the lower part of the assembly is fastened to the lower part of the shaft by suitable securing means.
- the assembly can be fixed to the head of the shaft by any suitable means as by set screws or by keys.
- a pair of socket male elements can be used for the lower part of the head of the shaft disposed eccentric and inclined with respect to the axis of the shaft, cooperating with an upper mounting ring 6 formed of two half rings obtained by cutting the ring along a diametric plane passing through the axis of the shaft. These half rings would then be put in place laterally to make the complementary double socket elements of the head of the shaft and of the ring register with each other.
- the two half rings could then be secured to each other by conventional means such as by bolting or by covering with an exterior sleeve.
- shaft 5 terminates at its lower end in a threaded part 21 on which is mounted an intermediate axial compression member 22 and a nut 23 associated with a lock nut 24.
- the assembly described above is thus interlocked by compression between head 1 of the shaft on one hand, provided with male shoulders on which the upper ring 6 is mounted, and nut 23 on the other hand.
- a high compression can be obtained by heating the shaft 5 to a temperature in the neighborhood of 150 C. prior to the tightening of nut 23 and lock nut 24. This high temperature can be obtained by introducing a heating rod in the bore of shaft 5.
- Transmission of the torque from the driving motor driving shaft 5 to the reaming elements is thus provided by the non-rotary mounting of the elements and by a compression force sufficient for securing the transmission of normal values of this torque. Transmission of this torque to the reaming elements occurs through the assembly connected to the head 1 of shaft 5 and not through shaft 5 itself which only provides for the alignment of the reaming elements and their mounting rings and places the assembly in compression.
- Lubrication is provided by ducts formed in the head of shaft 5 as at 25 and 26 and by radial ducts at 27 and 28 in the hubs of the reaming elements and by ducts 29, 30 and 31 through the mounting rings.
- Circulation of the lubricating fluid is achieved by injecting the fluid from the surface into the flexible tubular column supporting the reaming tool.
- Fluid is introduced through an axial duct in the stator 4 of the motor and provides lubrication of the bearings by flowing in the direction of the arrows through the ducts described above.
- a safety shaft 32 provides axial cohesion of the assembly in case shaft 5 breaks or in case of loosening of the lock nuts.
- This safety shaft is mounted in an axial bore in shaft 5 and supports a lock nut 24 at its lower end.
- a cap 33 is screwed to the lower end of the safety shaft and bears on lock nut 24.
- safety shaft 32 is put under slight tension by spring 34 located in a cavity of head 1 and resting on a portion of centering ring 35 in which the safety shaft can slide. Ring 35 is mounted on a seat 36 at the lower part of said cavity.
- a mushroom element 37 bears on a nut 38 threaded on the upper extremity of the safety shaft with a cotter pin provided to prevent nut 38 from unscrewing, and stops the other end of spring 34.
- the safety shaft maintains the cohesion of the elements of the assembly when shaft 5 breaks, as the mushroom 37 abuts against its seat 36 before the elements of the assembly have undergone relative axial displacement sufficient to separate from each other.
- a guiding or piloting structure is provided at the lower end of the reaming tool such as a known tricone having a smaller diameter than that of the bore to be reamed or a cutter head may be used to center the axis any in the bore.
- This structure may comprise a body 40 secured to the lower mounting ring 16 by structure 39 in which it is screwed, structure 39 being screwed in ring 16 as by conical thread 47.
- Three conical cutters 42, 43 and 44 turn around axes which are inclined with respect to the axis of body 40 and these conical cutters do not engage the wall of the bore.
- rollers 8, 12 and 15 roll on the wall of the bore or well with the speed of rotation of the tool and their teeth work in the same manner as the teeth of a tricone.
- Each two adjacent rollers have their lines of contact with the walls of the bore or well off-set by around the axis xy as seen in FIGS. la, 1b and 1c.
- rollers can advantageously be given a curved profile in the axial plane as seen in the drawings.
- the rollers include on their peripheral surfaces cutting or abrasive elements to attack the earth.
- These surfaces may include teeth, tungsten carbide elements or a diamond coating.
- the alignment of the teeth, cutting or abrading elements can be parallel to the axis of the roller or inclined thereto.
- rollers In certain types of terrain the rollers can be smooth.
- rollers off-set at 120 it is possible, for example, to use, in place of three rollers off-set at 120, two groups of two rollers off-set at these two groups being angularly shifted with respect to each other, or four rollers off-set at 90, a plurality of these combinations; or an arrangement in spiral.
- a reaming tool for bores formed in the earth having a shaft with an upper end and a lower end, a head at the upper end of the shaft coupled to the driving shaft of a motor, a plurality of reaming elements surrounding the shaft of said tool at different levels thereon, each reaming element consisting of a hub provided.
- said tool further comprising mounting rings connecting the reaming elements and having an internal bore, pairs of sleeve couplings, said couplings being eccentric with respect to each other and connecting each hub to the adjacent one of said rings, each sleeve coupling including a male and a female element, the hubs and said mounting rings forming by inter-engagement a tool assembly having an internal bore adapted to receive the tool with a slight clearance, said pairs of couples of socket elements being so disposed that when said assembly is mounted on the shaft said pairs of couples of socket elements are eccentric in at least two dilferent angular positions with respect to the axis of said shaft and are inclined to the axis thereof so as to prevent separation of said rings and said reaming elements as a result of the fitting of the shaft in said internal bore of said assembly, and said assembly being connected at one of its ends to the head of the shaft for rotation thereby, the torque of the driving motor thus being directly transmitted from said head to
- Apparatus as described in claim 4 including a lower terminal mounting ring, the hub of the reaming element at the lower end of said assembly being connected to said lower terminal mounting ring, a pair of couples of socket element, said couples being eccentric with respect to each other and being provided for connection of said terminal mounting ring to said lower reaming element, each couple of socket elements being constituted by the cooperation of a male element and a female element having axes inclined with respect to the axis of the shaft, said stop means being screwed on the lower end of the shaft.
- Apparatus as described in claim 5, including an upper terminal mounting ring, the hub of the reaming element located at the upper end of said assembly being engaged with said upper terminal mounting ring, a pair of couples of eccentric socket elements connecting said upper terminal ring and the upper reaming element, each couple comprising a male element and a female element having axes inclined and eccentric with respect to the axis of the shaft said upper terminal mounting ring being fitted to said shoulder means of the shaft, a pair of couples of socket elements being provided for fitting said shoulder and said upper terminal ring, said couples being eccentric with respect to each other and each couple comprising a male and a female element having axes eccentric with respect to the axis of the shaft.
- Apparatus as described in claim 6, including an internal axial conduit for the shaft, a cavity in said head communicating with the upper end of said axial conduit, a safety device, a shaft for said safety device mounted in said axial conduit, a mushroom shaped element provided at the upper end of said shaft and located in said cavity, an annular seat for said mushroom shaped element at the bottom of said cavity, spring means associated with said mushroom shaped element, and maintaining said shaft in an upper position above said seat, said mushroom shaped element, by engaging said seat in a lower position, partially blocking said internal conduit means, in the head of the shaft, a thread on the lower end of said safety shaft and a cap screwed on said thread, said cap bearing against said stop means at the lower end of the shaft.
- Apparatus for reaming bores formed in the ground comprising a shaft, a head at the upper end of said shaft,
- each of said reaming elements comprising a hub, a roller surrounding said hub for rotation thereon, each of said hubs comprising at each end a pair of socket elements, said elements being eccentric with respect to each other, mounting rings connecting said hubs, internal bores in said rings receiving said shaft, each of said rings at each end thereof having a pair of socket elements complementary to said pair of socket elements of the adjacent one of said hubs, at least one of said last named socket elements having its axis eccentric with respect to the axis of said internal bores of said rings, the pairs of said socket elements at the two extremities of a given one of said rings being angularly off-set with respect to the axis of said internal bores of said rings, said reaming elements and said rings comprising an assembly having an internal passage for said shaft, an upper terminal mounting ring between an extremity of said assembly and said head of said shaft, a lower
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- 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)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR6404A FR1468681A (fr) | 1965-02-19 | 1965-02-19 | Outil d'alésage des puits forés dans le sol |
Publications (1)
Publication Number | Publication Date |
---|---|
US3400773A true US3400773A (en) | 1968-09-10 |
Family
ID=8571481
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US527798A Expired - Lifetime US3400773A (en) | 1965-02-19 | 1966-02-16 | Reaming tools for wells bored in the ground |
Country Status (5)
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3659663A (en) * | 1970-12-28 | 1972-05-02 | Dresser Ind | Borehole reamer-stabilizer with improved fluid circulation |
US3753470A (en) * | 1970-11-27 | 1973-08-21 | Sandvik Ab | Eccentric drill tool |
US3799279A (en) * | 1972-09-25 | 1974-03-26 | R Farris | Optionally stabilized drilling tool |
US4071285A (en) * | 1976-09-07 | 1978-01-31 | Smith International, Inc. | Stabilizer |
US4071101A (en) * | 1976-03-08 | 1978-01-31 | Walker-Neer Mfg. Co., Inc. | Stabilizer for single or dual tube drilling |
US4080010A (en) * | 1976-09-07 | 1978-03-21 | Smith International, Inc. | Tandem roller stabilizer for earth boring apparatus |
US4082373A (en) * | 1976-09-07 | 1978-04-04 | Smith International, Inc. | Tandem roller stabilizer for earth boring apparatus |
US4102552A (en) * | 1976-09-07 | 1978-07-25 | Smith International, Inc. | Tandem eccentric roller stabilizer for earth boring apparatus |
US4683956A (en) * | 1984-10-15 | 1987-08-04 | Russell Larry R | Method and apparatus for operating multiple tools in a well |
US20130112484A1 (en) * | 2011-11-04 | 2013-05-09 | Shilin Chen | Eccentric sleeve for directional drilling systems |
US20150129309A1 (en) * | 2013-03-15 | 2015-05-14 | Charles Abernethy Anderson | Downhole Stabilizer |
WO2019211588A1 (en) * | 2018-04-30 | 2019-11-07 | Engineering Innovation & Design Limited | Wellbore reamer |
US11408230B2 (en) * | 2017-10-10 | 2022-08-09 | Extreme Technologies, Llc | Wellbore reaming systems and devices |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US790330A (en) * | 1904-06-10 | 1905-05-23 | Davis Calyx Drill Company | Core-drill. |
US2589534A (en) * | 1947-07-28 | 1952-03-18 | Ralph Q Buttolph | Drill guiding assembly |
US2696367A (en) * | 1949-05-13 | 1954-12-07 | A 1 Bit & Tool Company | Apparatus for stabilizing well drills |
US3042125A (en) * | 1957-06-10 | 1962-07-03 | Duncan Dan Mclean | Full hole deflection tool |
US3318397A (en) * | 1964-10-06 | 1967-05-09 | Chevron Res | Apparatus for use in well drilling |
-
1965
- 1965-02-19 FR FR6404A patent/FR1468681A/fr not_active Expired
-
1966
- 1966-02-16 US US527798A patent/US3400773A/en not_active Expired - Lifetime
- 1966-02-17 DE DEJ30086A patent/DE1239642B/de active Pending
- 1966-02-18 NL NL6602119A patent/NL6602119A/xx unknown
- 1966-02-21 AT AT159166A patent/AT258830B/de active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US790330A (en) * | 1904-06-10 | 1905-05-23 | Davis Calyx Drill Company | Core-drill. |
US2589534A (en) * | 1947-07-28 | 1952-03-18 | Ralph Q Buttolph | Drill guiding assembly |
US2696367A (en) * | 1949-05-13 | 1954-12-07 | A 1 Bit & Tool Company | Apparatus for stabilizing well drills |
US3042125A (en) * | 1957-06-10 | 1962-07-03 | Duncan Dan Mclean | Full hole deflection tool |
US3318397A (en) * | 1964-10-06 | 1967-05-09 | Chevron Res | Apparatus for use in well drilling |
Cited By (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3753470A (en) * | 1970-11-27 | 1973-08-21 | Sandvik Ab | Eccentric drill tool |
US3659663A (en) * | 1970-12-28 | 1972-05-02 | Dresser Ind | Borehole reamer-stabilizer with improved fluid circulation |
US3799279A (en) * | 1972-09-25 | 1974-03-26 | R Farris | Optionally stabilized drilling tool |
US4071101A (en) * | 1976-03-08 | 1978-01-31 | Walker-Neer Mfg. Co., Inc. | Stabilizer for single or dual tube drilling |
US4071285A (en) * | 1976-09-07 | 1978-01-31 | Smith International, Inc. | Stabilizer |
US4080010A (en) * | 1976-09-07 | 1978-03-21 | Smith International, Inc. | Tandem roller stabilizer for earth boring apparatus |
US4082373A (en) * | 1976-09-07 | 1978-04-04 | Smith International, Inc. | Tandem roller stabilizer for earth boring apparatus |
US4102552A (en) * | 1976-09-07 | 1978-07-25 | Smith International, Inc. | Tandem eccentric roller stabilizer for earth boring apparatus |
US4683956A (en) * | 1984-10-15 | 1987-08-04 | Russell Larry R | Method and apparatus for operating multiple tools in a well |
US20130112484A1 (en) * | 2011-11-04 | 2013-05-09 | Shilin Chen | Eccentric sleeve for directional drilling systems |
US20150129309A1 (en) * | 2013-03-15 | 2015-05-14 | Charles Abernethy Anderson | Downhole Stabilizer |
EP2971446A4 (en) * | 2013-03-15 | 2016-10-19 | Charles Abernethy Anderson | HOLE STABILIZER |
US9670742B2 (en) * | 2013-03-15 | 2017-06-06 | Charles Abernethy Anderson | Downhole stabilizer |
US11408230B2 (en) * | 2017-10-10 | 2022-08-09 | Extreme Technologies, Llc | Wellbore reaming systems and devices |
WO2019211588A1 (en) * | 2018-04-30 | 2019-11-07 | Engineering Innovation & Design Limited | Wellbore reamer |
US11788360B2 (en) | 2018-04-30 | 2023-10-17 | Engineering Innovation & Design Limited | Wellbore reamer |
Also Published As
Publication number | Publication date |
---|---|
FR1468681A (fr) | 1967-02-10 |
DE1239642B (de) | 1967-05-03 |
NL6602119A (US07321065-20080122-C00160.png) | 1966-08-22 |
AT258830B (de) | 1967-12-11 |
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