GB2126675A - A steel section for a drill string - Google Patents
A steel section for a drill string Download PDFInfo
- Publication number
- GB2126675A GB2126675A GB08225787A GB8225787A GB2126675A GB 2126675 A GB2126675 A GB 2126675A GB 08225787 A GB08225787 A GB 08225787A GB 8225787 A GB8225787 A GB 8225787A GB 2126675 A GB2126675 A GB 2126675A
- Authority
- GB
- United Kingdom
- Prior art keywords
- drill steel
- steel section
- drill
- coupling
- section according
- 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- Withdrawn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
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 169
- 239000010959 steel Substances 0.000 title claims abstract description 169
- 230000008878 coupling Effects 0.000 claims abstract description 77
- 238000010168 coupling process Methods 0.000 claims abstract description 77
- 238000005859 coupling reaction Methods 0.000 claims abstract description 77
- 230000002093 peripheral effect Effects 0.000 claims description 12
- 230000005012 migration Effects 0.000 claims description 11
- 238000013508 migration Methods 0.000 claims description 11
- 230000001419 dependent effect Effects 0.000 claims 2
- 238000005553 drilling Methods 0.000 description 18
- 230000008901 benefit Effects 0.000 description 6
- 239000012530 fluid Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 229910000760 Hardened steel Inorganic materials 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 206010016256 fatigue Diseases 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000009527 percussion Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
- E21B17/042—Threaded
- E21B17/0426—Threaded with a threaded cylindrical portion, e.g. for percussion rods
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
A drill steel section 10 adapted for selective coupling end-to-end with other drill steel sections to form an elongate drill string, the drill steel section comprising: an elongate tubular portion having a coupling arrangement, preferably a thread 16, on the inside or outside, a stress relief means 22 formed on the other of the inside or outside the said stress relief means 22 extending longitudinally of the tubular portion and longitudinally coextending with at least a major portion of the said coupling arrangement 16. It is preferable for the coupling means to be internal and the stress relief means to be external. The stress relief means may be circumferential grooves or a single-start or multi-start helical groove arrangement. <IMAGE>
Description
SPECIFICATION
A steel section for a drill string
This invention relates to a steel section for a drill string.
In the earth drilling arts it is common practice to provide a drilling rig with an elongate boom or mast and a drill, such as a rotary percussion drill, which is supported on the mast for controlled movement longitudinally thereof by a powered feed means. An elongate drill string having a drilling bit secured to its forwardmost end extends longitudinally of the mast and is operably engaged by the drill motor whereby a percussive or impact drilling action, or a combined impact and rotary drilling action, may be imparted to the drill string as it is driven endwise into an earth formation.
In practice, the limit of drill motor movement along the mast is often less than the desired hole depth. Therefore, earth drilling operations are often carried out by assembling the drill string from a number of elongate drill steel sections and cooperable coupling members as drilling progresses.
Many drill steel coupling systems are shown in the prior art. By way of illustrative example, U.S.
Patent Specification No. 3,211,484 discloses an elongate drill steel having alternate external threaded and non-threaded sections wherein a threaded section is located adjacent one end of the drill steel and is intended to be secured to the cooperating end of a similarly threaded drill steel by an internally threaded coupling member as shown in Figure 1 of the patent specification.
Figure 4 of the same specification illustrates a pair of connected drill steels having internal threaded and non-threaded sections including internally threaded end sections which are engageable by a suitable externally threaded coupling member to secure two such drill steels together. U.S. Patent
Specification No. 3,424,479 discloses a drill steel having external threads, extending over substantially the entire axial length thereof. U.S.
Patent Specification No. 3,567,254 discloses a drill steel which includes alternate external threaded and non-threaded sections wherein the threaded portions located adjacent an end of the drill steel are engageable by an internally threaded coupling member to secure a pair of the drill steels together. The non-threaded portions of the drill steels include collars which cooperate with the couplings to preclude coupler migration in either direction along the threaded end portions of the connected drill steels. In the system of U.S. Patent
Specification No. 3,822,952 and in the system of the above mentioned specifications the drill steel and coupling system permits worn threads adjacent the drill steel end to be cut off for further use of the drill steel by employing a new threaded portion adjacent to the worn portion.
It is also well known in the art to provide conventional drill steels with stress relieving means for the purpose of reducing the incidence of fatigue failure or the occurrence of stress risers in the drill steel structure. For example, U.S. Patent
Specification No. 3,966,341 disclose a drill steel provided with a threaded end portion which is suitable for engagement with a coupler to couple a pair of such drill steels together end-to-end. A stress relief means is provided adjacent the threaded end section of the drill steel and as shown includes a serial plurality of axially spaced, circumferential undercut or grooves.
The present invention is intended to offer improvements over heretofore known drill steels and coupling systems such as those described hereinabove.
Accordingly, one aspect of the present invention provides a drill steel section for use in making up an elongate drill string wherein the drill steel section comprises a coupling means adjacent at least one end thereof for coupling the drill steel section end-to-end with a second drill steel section, and a formed stress relief means extending longitudinally of the drill steel section and longitudinally coextending with at least a major portion of the said coupling means,
The term "longitudinal" embraces, but is not equivalent to, the term "axial".
Preferably, the drill steel section is substantially tubular and the coupling means comprises an integrally formed means extending longitudinally on the interior periphery of the drill steel section.
Conveniently, the coupling means comprises formed threads. Advantageously, the stress relief means comprises an integrally formed means extending on the exterior periphery of the drill steel section and, suitably, the stress relief means comprises a serial plurality of longitudinally spaced circumferential grooves. Alternatively, however, the stress relief means comprises a helical groove means. Preferably, the said groove or grooves extend to a depth of at least 0.01 inches (25.4 mm) below the full diameter of the exterior peripheral surface of the drill steel section and, most preferably, the said depth is 0.01 inches (25.4 to 254 mm).
Advantageously, the longitudinal extent of the said threads is greater than the extent of thread required for fully coupling the drill steel section to another drill steel section. Preferably, the longitudinal extent of the said threads is at least twice the extent necessary for fully coupling the drill steel section to another drill steel section.
Suitably, the stress relief means has a longitudinal extent along the drill steel section greater than the longitudinal extent of the coupling means therealong. Conveniently, the coupling means comprises formed threads and the stress relief means has a longitudinal extent along the drill steel section which is greater than the longitudinal extent of the said threads therealong by substantially 1/2 the root diameter of the said threads. Suitably, the coupling means comprises a formed coupling portion adjacent at least one end of the drill steel section and a coupler member which is cooperable with the said formed coupling portion for coupling the drill steel section to another drill steel section. Preferably the drill steel section comprises a means cooperable with
another drill steel section coupled thereto to
prevent longitudinal migration of the said coupler
member.
A second aspect of the invention provides a drill steel section adapted for selective coupling endto-end with other drill steel sections to form an elongate drill string, the drill steel section comprising: an elongate substantially tubular portion located adjacent one end thereof and having an internal peripheral portion and an external peripheral portion; a coupler engaging means formed on one of the said internal and external peripheral portions and extending longitudinally of the tubular portion; and a stress relief means formed on the other of the said internal and external peripheral portions, the said stress relief means extending longitudinally of the tubular portion and longitudinally coextending with at least a major portion of the said coupler engaging means.
So that the present invention may be more readily understood and so that further features may be appreciated, various drill steels in accordance with the invention will now be described by way of example and with reference to the accompanying drawing, in which:
Figure 1 is a fragmentary longitudinal section of one such drill steel;
Figure 2 is a fragmentary longitudinal section similar to Figure 1 showing an alternative embodiment;
Figure 3 is a fragmentary side elevation, partially in longitudinal section, showing yet another embodiment of the invention;
Figure 4 is a fragmentary side elevation similar to a portion of Figure 3 showing a stress relief means of an embodiment of the present invention;
Figure 5 is a longitudinal section showing one manner of coupling a pair of drill steels of the embodiment of Figure 1;;
Figure 6 is a longitudinal section similar to
Figure 5 showing one means for coupling a pair of drill steels of the embodiments of Figures 2 or 3;
Figure 7 is a longitudinal section showing an alternative means for coupling a pair of drill steels of the embodiments of Figures 2 or 3; and
Figure 8 is a longitudinal section showing another means for coupling a pair of drill steels of the embodiments of Figures 2 or 3.
Referring to Figures 1 to 4, there is generally indicated at 10 a longitudinally extending portion of a drill steel in accordance with the present invention. The drill steel 10 is formed from any suitable material such as hardened steel and has a tubular form which provides an internal periphery 12 and an external periphery 14.
Although the description hereinbelow refers only to one end portion of the drill steel, it will be appreciated that in general the description applies to both longitudinal ends of any given drill steel of the present invention.
The inner periphery 12 has formed thereon any suitable force bearing thread such as rope thread 1 6 extending a distance L from one end 1 8 of the drill steel 10 to an undercut 20 wherein L ordinarily would be about two or three times the internal thread root diameter, or major diameter, D of the thread 1 6. The thread 1 6 may be either a single or a multiple start thread, as desired, and the length of the thread 1 6 may be the length of thread engagement by a suitable drill steel coupling member (to be described hereinbelow) or alternatively may be a multiple, XL, of such engagement length, as is shown in Figure 2.
Alternatively, the drill steel 10 may have internal threads 1 6 extending continuously from one end 1 8 to the other (Figure 3), in which case the undercut 20 is not provided.
The undercut 20 provides for convenient thread runout so that the thread length may be readily controlled during the thread forming process. If precise enough control over the threading process is exercised by such techniques as cycle control or numeral control, the thread forming process may be sufficiently precise that thread runout at the proper point can be accomplished without resorting to use of the undercut 20.
The internal threads 1 6 may be formed by a hammer swedging process in which the drill steel 10 is swedged down on a threaded mandrel (not shown). The undercut 20 may be formed to provide a shoulder of smaller diameter than the coupling whereby the coupling will be constrained against migration in the longitudinal direction, as is described below.
Also illustrated in Figures 1 to 3 is a stress relief means shown as a serial plurality of longitudinally spaced, circumferential grooves 22 formed on the exterior periphery 14 of the drill steel 10. In the case of the construction of Figures 1 and 2, the circumferential grooves 22 are preferably coextensive with the thread 16 from the axial end 1 8 of the drill steel 10 to a point 24 spaced beyond the terminus of the thread 1 6 by a distance of approximately D/2, where D is the root diameter of the thread 1 6. One purpose in having the stress relief grooves 22 extend beyond the run of the thread 1 6 is to minimize the effect of the undercut 20 as a stress riser.
As will be seen from Figure 3, in the case of a drill steel 10 having an internal thread 1 6 extending continuously from one end 1 8 to the other, the serial plurality of circumferential grooves 22 also extends continuously from one end 1 8 to the other.
In an alternative embodiment of the stress relief means of this invention, shown in Figure 4, the stress relief is provided by a helical groove means 26 extending along the exterior periphery 14 of the drill steel 10 through the desired distance as described above. The helical groove means 26 may be either a single start or a multiple start groove, as deemed desirable. For the embodiments of Figures 1 or 2 such a helical stress relief groove or grooves may taper out to the full drill steel outside diameter or may run out to a blind end. The depth of the external groove 22 or 26 at the root is preferably at least 0.01 inches (25.4 mm) to assure that it will be deeper than the expected surface damage which might ordinarily
be inflicted upon the full diameter lands 28
located between adjacent grooves 22 or between
the turns of the helical groove 26.Of course, the
stress relief grooves 22, 26 may be as deep as
0.05 or 0.1 inches (127.0 or 252.0 mm) or more
as deemed necessary or desirable, consistent with
overall drill steel strength considerations.
The stress relief grooves 22 provide a
multiplicity of longitudinally distributed stress
risers along a length of the drill steel 10, thereby to distribute stress concentrations along the drill steel. In addition, as the stress concentrations are
located in the recessed grooves 27 which are protected from physical damage by the intervening full diameter lands 28, it has been found that any damage to the exposed exterior surfaces of the intervening lands 28, such as might result from contact with the bore hole wall or from detritus impingement, will not produce serious stress risers. Of course, the helical groove 26 functions in the same way.
Figures 5 to 7 show several embodiments of couplings to secure together the drill steels 10 described above. Each coupling 30 for the drill steels 10 includes an elongate, externally threaded member 31 having an axially extending through bore 32. The exterior threads 34 of the couplings 30 are cooperable with the interior threads 1 6 of the drill steels 10 for threaded engagement therewith. In Figure 5 the coupling member 31 is slightly shorter than the distance between respective shoulders 36 in the undercuts 20 of two drill steels 10 abutted end-to-end whereby, when the drill steels 10 are screwed together onto the coupling 30, the coupling is captively retained between the shoulders 36 and is thus constrained against migration in the axial direction.In this configuration the drill steel ends 1 8 abut directly on one another whereby the impact drilling forces are conducted from one drill steel to the next through a single interface. Drilling fluid is passed through the tubular drill steels 10 and the axial bores 32 in the couplings 30 for the purpose of bit cooling and bore hole cleaning, as is well known.
In Figures 6 and 7 the drill steels 10 to be coupled are threaded throughout a distance XL or threaded continuously as described above whereby, if the joint were to loosen, a coupling 30 such as that shown in Figure 5 would be free to migrate away from the joint. Accordingly, the coupling to be used, labelled 30' in Figure 6, includes intermediate the threaded ends thereof a circumferentially extending land 38 of enlarged diameter which presents oppositely facing shoulders 40 against which the axial ends 1 8 of the respective drill steels 10 to be coupled are abutted when the joint is tightened down. The shoulders thus fixedly locate the coupler 30' axially with respect to the drill steels 10 and prevent coupler migration.This is not the most desirable arrangement as the impact drilling forces must be transmitted through two abutting interfaces at each coupling. A more preferable approach is illustrated in Figure 7 wherein a
coupling 30" includes a circumferential land 42 of
enlarged diameter formed on the coupling 30"
intermediate its threaded ends. The diameter of
land 42 is substantially smaller than the exterior diameter of the drill steels 10 and each drill steel
10 has an interior annular groove 44 formed adjacent the respective end 1 8 such that when the drill steels 10 are screwed on to the coupling 30" the ends 18 of the drill steels directly abut one another and the impact drilling forces are conducted through only a single mechanical interface from one drill steel 10 to the next.The annular grooves 44 formed in the adjacent end portions of the connected drill steels 10 form an undercut 45 which surrounds and captively retains the annular land 42 of the coupling 30" to prevent coupling migration.
In an alternative embodiment illustrated in
Figure 8 the coupling 30"' includes a circumferential conical portion 52 of enlarged diameter formed outwardly of the coupling 30"' intermediate its threaded ends. The outside diameter of the conical portion 52 is smaller than the exterior diameter of the drill steel 10, and each drill steel 10 has an interior camber 54 formed inwardly and adjacent the respective end 1 8 such that when the drill steels are screwed onto the coupling 30"' the ends 1 8 of the adjacent drill steels directly abut on one another and the impact drilling forces are conducted through only a single mechanical interface from one drill steel to the next.The interior cambers 54 formed in the adjacent end portions of the connected drill steels 10 form an undercut 55 which surrounds and captively retains the conical portion 52 of the coupling 30"' to prevent coupling migration. An advantage of the embodiment illustrated in
Figure 8 is the relative ease with which the camber 54 may be formed in the drill steel initially or when the rod has broken.
The advantages of the described drill steel and coupling system are manifold. In order to provide efficient and economical drilling operations, practitioners of the art have sought ways to assure quick and easy refurbishing of a broken or damaged end portion of a drill steel for further use thereof. It has been found that the embodiments of Figures 2 and 3 provide such a capability in that, if the threads engaged by a coupling have been damaged, the damaged thread portions may be quickly cut off and the end of the drill steel dressed to provide new threads and to permit further use of the drill steel. By locating the thread inside the tubular drill steel the potential for thread damage has been found to be minimized, most particularly due to the elimination of thread contact with the bore hole wall during drilling. An additional advantage is provided by the stress relief means being coextensive with the coupler engaging portion of the drill steel. In this context it is noteworthy that the described stress relief means may be other constructions than radial or helical grooves, and may be coextensive with other forms of coupler engaging means than threads. For example, it is believed that the disclosed stress relief means would offer the same benefits as described above with respect to threads if the coupling means were instead an unconventional coupling arrangement such as a taper fit or a bayonet lock.
Another advantage that has been noted is that the interior passage through the tubular drill steel constitutes the flow path for blow air or other fluid which is utilised for bit cooling and to clear detritus from the bottom of the bore hole. This may be a reduced flow rate compared to the flow rate available for prior, externally coupled, drill steels because the through bore in the couplings is necessarily of limited size; however, even such a reduced flow rate has been effective for the following reasons. For a given air or other fluid pressure, the available fluid flow rate is limited by the cross-sectional area of the coupling through bores, as noted.However, as the drill string described above carries its coupling members inside, the outer diameter of the drill string tends to fill the bore hole more completely than do prior drill string systems in which the outside diameter of the coupling is the limiting factor in bore hole diameter and the major part of the drill string is much smaller than the bore hole diameter.
Accordingly, in devices in accordance with the present invention, the annular space between the drill steel and the bore hole wall tends to be much smaller and more uniform than for conventional drill strings, and this provides for greater blow air or other fluid flow velocity for a given flow rate through the interior of the drill string. As greater flow velocity produces better detritus removal from the bore hole, it has been found that devices in accordance with the present invention can improve the efficiency of detritus removal for a given blow air or drilling fluid pressure.
Other advantages have included improved stiffness of the tubular drill steels as compared to conventional drill steels. The stiffer drill steel tends to bore a straighter, truer hole. In addition, the impact drilling stress waves propagate along the tubular drill steel and therefore are delivered to the outer periphery of the drilling bit. This is believed to provide a more efficient drilling action than does the delivery of stress waves centrally of the bit as occurs in smaller diameter, conventional drill steels. It may be additionally noted that as the tubular drill steel is stiffer, energy propagation along the drill steel is more efficient because the drill steel has less tendency to bend under the force of feed pressure.
Not intending to be limited to those specific embodiments described hereinabove, the inventors believe that the invention is capable of other constructions within a wide design latitude without departing from the broad spirit of the invention. For example, the specific dimensions and proportions mentioned above are capable of some variation, the specific cross sectional shape of the stress relief grooves as illustrated may be altered in various ways so long as dangerous stress risers are not produced thereby, the central lands of the couplers may instead be radially projecting lugs or other forms which do not have a continuous circumferential extent at a uniform diameter, and the like. In addition, it will be appreciated that the coextensive stress relief means and drill steel coupling threads may be utilised, in modified form, in those structures utilizing systems which do not require a separate coupler element.
In addition, it is to be appreciated that features illustrated individually in respective drawings may, where suitable, be combined with one another in a single embodiment.
Claims (31)
1. A drill steel section for use in making up an elongate drill string wherein the drill steel section comprises a coupling means adjacent at least one end thereof for coupling the drill steel section end-to-end with a second drill steel section, and a formed stress relief means extending longitudinally of the drill steel section and longitudinally coextending with at least a major portion of the said coupling means.
2. A drill steel section according to claim 1 wherein the drill steel section is substantially tubular and the coupling means comprises an integrally formed means extending longitudinally on the interior periphery of the drill steel section.
3. A drill steel section according to claim 1 or 2 wherein the coupling means comprises formed threads.
4. A drill steel section according to any one of the preceding claims wherein the stress relief means comprises an integrally formed means extending on the exterior periphery of the drill steel section.
5. A drill steel section according to claim 4 wherein the stress relief means comprises a serial plurality of longitudinally spaced circumferential grooves.
6. A drill steel section according to claim 4 wherein the stress relief means comprises a helical groove means.
7. A drill steel section according to claim 5 or 6 wherein the said groove or grooves extend to a depth of at least 0.01 inches (25.4 mm) below the full diameter of the exterior peripheral surface of the drill steel section.
8. A drill steel section according to claim 12 wherein the said groove or grooves extend to a depth in the range of 0.01 inches to 0.1 inches (25.4 mm to 254 mm) below the full diameter of the exterior peripheral surface of said drill steel section.
9. A drill steel section according to claim 3 or any claim dependent thereon wherein the longitudinal extent of the said threads is greater than the extent of thread required for fully coupling the drill steel section to another drill steel section.
10. A drill steel section according to claim 9 wherein the longitudinal extent of the said threads is at least twice the extent necessary for fully coupling the drill steel section to another drill steel section.
11. A drill steel section according to any one of the preceding claims wherein the stress relief means has a longitudinal extent along the drill steel section greater than the longitudinal extent of the coupling means therealong.
12. A drill steel section according to claim 11 wherein the coupling means comprises formed threads and the stress relief means has a longitudinal extent along the drill steel section which is greater than the longitudinal extent of the said threads therealong by substantially 1/2 the root diameter of the said threads.
13. A drill steel section according to claim 2 or any claim dependent thereon wherein the coupling means comprises a formed coupling portion adjacent at least one end of the drill steel section and a coupler member which is cooperable with the said formed coupling portion for coupling the drill steel section to another drill steel section.
14. A drill steel section according to claim 13 wherein the drill steel section comprises a means cooperable with another drill steel section coupled thereto to prevent longitudinal migration of the said coupler member.
1 5. A drill steel section according to claim 14 wherein the said means to prevent migration comprises undercut means formed within an interior peripheral portion of the drill steel section.
1 6. A drill steel section according to claim 14 wherein the said means for preventing migration comprises an enlarged diameter means formed on the said coupler means.
1 7. A drill steel section according to claim 1 6 wherein, when the coupler member is coupled to the drill steel section, the drill steel section longitudinally abuts the said enlarged diameter means.
18. A drill steel section according to claim 1 6 wherein: when the drill steel section is coupled to a second drill steel section by the coupling means, the drill steel section longitudinally abuts the said second drill steel section; and the drill steel section comprises a means adapted to captively retain the said enlarged diameter means to preclude longitudinal migration of the said coupler member.
1 9. A drill steel section adapted for selective coupling end-to-end with other drill steel sections to form an elongate drill string, the drill steel section comprising: an elongate substantially tubular portion located adjacent one end thereof and having an internal peripheral portion and an external peripheral portion; a coupler engaging means formed on one of the said internal and external peripheral portions and extending longitudinally of the tubular portion; and a stress relief means formed on the other of the said internal and external peripheral portions, the said stress relief means extending longitudinally of the tubular portion and longitudinally coextending with at least a major portion of the said coupler engaging means.
20. A drill steel section according to claim 1 9 wherein the said stress relief means and coupler engaging means each extend longitudinally of the tubular portion from the said one end.
21. A drill steel section according to claim 19 or 20 wherein the said stress relief means comprises a circumferential groove means and the said coupler engaging means comprises a thread means.
22. A drill string comprising a section according to any one of the preceding claims.
23. A drill section according to claim 1 substantially as described herein with reference to, and as shown in, Figure 1 of the accompanying drawings.
24. A drill steel section according to claim 1 substantially as described herein with reference to, and as shown in, Figure 2 of the accompanying drawings.
25. A drill steel section according to claim 1 substantially as described herein with reference to, and as shown in, Figure 3 of the accompanying drawings.
26. A drill steel section according to claim 1 substantially as described herein with reference to, and as shown in, Figure 4 of the accompanying drawings.
27. A drill string substantially as described herein with reference to, and as shown in, Figure 5 of the accompanying drawings.
28. A drill string substantially as described herein with reference to, and as shown in, Figure 6 of the accompanying drawings.
29. A drill string substantially as described herein with reference to, and as shown in, Figure 7 of the accompanying drawings.
30. A drill string substantially as described herein with reference to, and as shown in, Figure 8 of the accompanying drawings.
31. Any novel feature or combination of features disclosed herein.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08225787A GB2126675A (en) | 1982-09-09 | 1982-09-09 | A steel section for a drill string |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08225787A GB2126675A (en) | 1982-09-09 | 1982-09-09 | A steel section for a drill string |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB2126675A true GB2126675A (en) | 1984-03-28 |
Family
ID=10532812
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08225787A Withdrawn GB2126675A (en) | 1982-09-09 | 1982-09-09 | A steel section for a drill string |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2126675A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0354887A1 (en) * | 1988-07-08 | 1990-02-14 | Sandvik Aktiebolag | Method to establish a thread coupling |
| WO1997032109A1 (en) * | 1996-02-29 | 1997-09-04 | Ingersoll-Rand Company | Dual pitch connecting joint |
| CN102140892A (en) * | 2011-01-24 | 2011-08-03 | 中国水电顾问集团中南勘测设计研究院 | Elastic drill rod joint |
| CN102155171A (en) * | 2010-12-14 | 2011-08-17 | 张超 | Drill rod joint |
| WO2015187217A1 (en) * | 2014-06-05 | 2015-12-10 | Materion Corporation | Coupling for rods |
| US10844671B2 (en) | 2014-03-24 | 2020-11-24 | Materion Corporation | Low friction and high wear resistant sucker rod string |
| US11459832B2 (en) | 2014-06-05 | 2022-10-04 | Materion Corporation | Couplings for well pumping components |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1061158A (en) * | 1964-11-19 | 1967-03-08 | Paragon Plastics Ltd | An improvement in or relating to fluid tight connections |
| GB1075550A (en) * | 1964-01-02 | 1967-07-12 | Chevron Res | Pipe thread dope |
| GB1417983A (en) * | 1972-03-09 | 1975-12-17 | British Steel Corp | Joint system |
-
1982
- 1982-09-09 GB GB08225787A patent/GB2126675A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1075550A (en) * | 1964-01-02 | 1967-07-12 | Chevron Res | Pipe thread dope |
| GB1061158A (en) * | 1964-11-19 | 1967-03-08 | Paragon Plastics Ltd | An improvement in or relating to fluid tight connections |
| GB1417983A (en) * | 1972-03-09 | 1975-12-17 | British Steel Corp | Joint system |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0354887A1 (en) * | 1988-07-08 | 1990-02-14 | Sandvik Aktiebolag | Method to establish a thread coupling |
| WO1997032109A1 (en) * | 1996-02-29 | 1997-09-04 | Ingersoll-Rand Company | Dual pitch connecting joint |
| CN102155171A (en) * | 2010-12-14 | 2011-08-17 | 张超 | Drill rod joint |
| CN102140892A (en) * | 2011-01-24 | 2011-08-03 | 中国水电顾问集团中南勘测设计研究院 | Elastic drill rod joint |
| CN102140892B (en) * | 2011-01-24 | 2014-11-05 | 中国电建集团中南勘测设计研究院有限公司 | Elastic drill rod joint used for directional drilling |
| US10844671B2 (en) | 2014-03-24 | 2020-11-24 | Materion Corporation | Low friction and high wear resistant sucker rod string |
| US11352838B2 (en) | 2014-03-24 | 2022-06-07 | Materion Corporation | Low friction and high wear resistant sucker rod string |
| EP3152341A4 (en) * | 2014-06-05 | 2018-01-31 | Materion Corporation | Coupling for rods |
| RU2688416C2 (en) * | 2014-06-05 | 2019-05-22 | Материон Корпорейшн | Rod connector |
| US10435955B2 (en) | 2014-06-05 | 2019-10-08 | Materion Corporation | Coupling for rods |
| WO2015187217A1 (en) * | 2014-06-05 | 2015-12-10 | Materion Corporation | Coupling for rods |
| US11008818B2 (en) | 2014-06-05 | 2021-05-18 | Materion Corporation | Coupling for rods |
| US11459832B2 (en) | 2014-06-05 | 2022-10-04 | Materion Corporation | Couplings for well pumping components |
| US11725463B2 (en) | 2014-06-05 | 2023-08-15 | Materion Corporation | Coupling for rods |
| EP4343110A3 (en) * | 2014-06-05 | 2024-06-19 | Materion Corporation | Drilling component for rods |
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