1. Field of the Invention
This invention relates generally to feed cable systems for drilling machines.
2. Description of the Related Art
There are many different types of drilling machines for drilling through a formation. Some of these drilling machines are mobile and others are stationary. Some examples of mobile and stationary drilling machines are disclosed in U.S. Pat. Nos. 3,245,180, 3,692,123, 3,708,024, 3,778,940, 3,815,690, 3,833,072, 3,905,168, 3,968,845, 3,992,831, 4,020,909, 4,170,340, 4,478,291, 4,595,065, 5,988,299, 6,672,410, 6,675,915, 7,325,634, 7,347,285 and 7,413,036, as well as U.S. Patent Application No. 2003056989 and International Application No. PCT/NO96/00310. Some drilling machines, such as the one disclosed in U.S. Pat. No. 4,295,758, are designed to float and are useful for ocean drilling. The contents of these cited U.S. Patents are incorporated by reference as though fully set forth herein.
A typical mobile drilling machine includes a vehicle and tower, wherein the tower carries a rotary head and drill string. The rotary head is coupled with the tower using a feed cable system, wherein the feed cable system allows the rotary head to move between raised and lowered positions. In operation, the drill string is driven into the formation by the rotary head. In this way, the drilling machine drills through the formation. More information about drilling machines, and how they operate, can be found in the above-identified references.
The feed cable system typically includes two pull up cables which couple the rotary head to the top of the tower. The two pull up cables are separately coupled to the tower, as disclosed in U.S. Pat. No. 7,413,036 and U.S. Patent Application No. 20030056993, so that the tension in the pull up cables can be different. It is desirable, however, to have the tension in the two pull up cables to be the same so that the rotary head is held level. When the tension in the two pull up cables are different, the rotary head tilts so that it is not held level.
The present invention provides a drilling machine with a feed cable system. The novel features of the invention are set forth with particularity in the appended claims. The invention will be best understood from the following description when read in conjunction with the accompanying drawings.
a and 2b are side views of a tower crown of the tower of
c and 2d are side views of a tower base of the tower of
e is a perspective view of a tower base of the tower of
a and 3b are is side views of a slack take up device coupled with an equalizer bar, wherein the slack take up device and equalizer bar are included with the feed cable system of
c and 3d are side views of the tower crown of the tower of
a and 4b are perspective and side views, respectively, of one embodiment of an equalizer bar, in accordance with the invention, included with the feed cable system of
a and 5b are perspective and side views, respectively, of another embodiment of an equalizer bar, in accordance with the invention, included with the feed cable system of
a and 6b are side views of the equalizer bar of
a is a perspective view of the tower of
b is a side view of the tension adjusting devices of
c is a close-up perspective view of the tension adjusting devices of
d is a perspective view of the tension adjusting devices of
In this embodiment, drilling machine 100 includes a platform 108 which carries a power pack 101 and operator's cab 103. Power pack 101 typically includes many different components, such as a prime mover. Operator's cab 103 includes controls for controlling the operation of drilling machine 100.
In this embodiment, drilling machine 100 includes a tower 102 which is carried by a table 119, wherein table 119 is coupled to platform 108. Tower 102 includes a tower base 102a and tower crown 102b, wherein tower base 102a is positioned proximate to table 119 and tower crown 102b is positioned away from table 119. Tower 102 is rotatably mounted to platform 108 so that it is repeatably moveable between raised and lowered positions.
In this embodiment, tower 102 carries a feed cable system 130 and rotary head 106. Feed cable system 130 will be discussed in more detail below. Rotary head 106 is operatively coupled with a drill string 107. Drill string 107 generally includes one or more drill pipes connected together in a well-known manner. The drill pipes of drill string 107 are capable of being attached to an earth bit (not shown), such as a tri-cone rotary earth bit. Rotary head 107 is moved between the raised and lowered positions to raise and lower, respectively, drill string 107 through table 119 and tower 102. Rotary head 107 is moved between the raised and lowered positions to raise and lower, respectively, the earth bit through a formation. Further, rotary head 106 is used to rotate drill string 108 so that the earth bit is rotated through the formation. It should be noted that the operation of rotary head 106 and feed cable system 130 is typically controlled by the operator in operator's cab 103.
a and 2b are side views of tower crown 102b with rotary head 106 in raised and lowered positions, respectively, wherein rotary head 106 is carried by feed cable system 130.
In this embodiment, feed cable system 130 includes pull up feed cable system 131 and pull down feed cable system 133. It should be noted that
Feed cable system 130 includes a slack take up device 110 coupled to tower 102. Slack take up device 110 can be coupled to tower 102 in many different ways. In this embodiment, slack take up device 110 is coupled to chord 104a. Chord 104a is positioned away from table 119, so that slack take up device 110 is coupled to tower 102 away from table 119.
Slack take up device 110 operates as an actuator and is repeatably moveable between extended and retracted conditions. Slack take up device 110 can be embodied in many different ways. In this embodiment, slack take up device 110 includes a cylinder 111 and piston 112, wherein cylinder 111 is coupled with chord 104a and piston 112 is coupled with equalizer bar 120. In the extended condition, piston 112 is moved away from cylinder 111 and, in the retracted condition, piston 112 is moved towards cylinder 111. More information regarding slack take up device 110 is provided below.
In this embodiment, feed cable system 130 includes an equalizer bar 120 coupled with slack take up device 110. Hence, feed cable system 130 includes a slack take up device which couples an equalizer bar to a tower. In particular, feed cable system 30 includes a slack take up device which couples an equalizer bar to a chord of a tower crown.
In this embodiment, equalizer bar 120 is coupled with pull up cables 132a and 132b. In this way, feed cable system 130 includes a slack take up device which couples first and second pull up cables and to a tower crown through an equalizer bar. Pull up cable 132a extends between equalizer bar 120 and a pulley 133c, which is positioned below equalizer bar 120. Pull up cable 132a extends between pulley 133c and a pulley 133a, wherein pulley 133a is positioned above pulley 133c. Pull up cable 133a extends between pulley 133a and rotary head 106, wherein rotary head 106 is positioned below pulley 133a.
Pull up cable 132b extends between equalizer bar 120 and a pulley 133d, which is positioned below equalizer bar 120. Pull up cable 132b extends between pulley 133d and a pulley 133b, wherein pulley 133b is positioned above pulley 133d. Pull up cable 132a extends between pulley 133b and rotary head 106, wherein rotary head 106 is positioned below pulley 133b. It should be noted that, in this embodiment, pull up cables 132a and 132b, as well as pulleys 133a, 133b, 133c and 133d are included with pull up feed cable system 131. Further, in this embodiment, slack take up device 110 and equalizer bar 120 are also included with pull up feed cable system 131.
In this embodiment, feed cable system 130 includes pull down cables 134a and 134b with ends (not shown) coupled with table 119. Pull down cable 134a extends between table 119 and a pulley 135a, wherein pulley 135a is positioned above table 119. Pull down cable 134a extends between pulley 135a and a pulley 135c, wherein pulley 135c is positioned below pulley 135a. Pull down cable 134a extends between pulley 135c and rotary head 106, wherein rotary head 106 is positioned above pulley 135c.
Pull down cable 134b extends between table 119 and a pulley 135b, wherein pulley 135b is positioned above table 119. Pull down cable 134b extends between pulley 135b and a pulley 135d, wherein pulley 135d is positioned below pulley 135b. Pull down cable 134b extends between pulley 135d and rotary head 106, wherein rotary head 106 is positioned above pulley 135d. It should be noted that, in this embodiment, pull down cables 134a and 134b, as well as pulleys 135a, 135b, 135c and 135d are included with pull down feed cable system 133.
The operation of equalizer bar 120 and slack take up device 110 is discussed in more detail with reference to
As mentioned above, slack take up device 110 is repeatably moveable between extended and retracted conditions. Slack take up device 110 operates as an actuator and is repeatably moveable between extended and retracted conditions. In this embodiment, slack take up device 110 includes cylinder 111 and piston 112. In the extended condition of
As mentioned above, chord 104a is positioned away from table 119. Hence, in the extended condition, equalizer bar 120 moves towards table 119 (
In operation, equalizer bar 120 drives the tension of pull up cables 132a and 132b to equal each other. For example, a reference line 125 extends through slack take up device 110 and reference lines 126 and 127 extend through equalizer bar 120 along pull up cables 132a and 132b, respectively. Hence, slack take up device 110 experiences an upwardly directed force F1 and pull up cables 132a and 132b experience upwardly directed forces opposed to F2 and F3, respectively. It should be noted that force F1 is equal to the sum of forces F2 and F3. Force F1 is applied to slack take up device 110 because slack take up device 110 is coupled with tower crown, as discussed in more detail above. Forces F2 and F3 are applied to pull up cables 132a and 132b, respectively, because pull up cables 132a and 132b are coupled with rotary head 106. Further, forces F2 and F3 are applied to equalizer bar 120 because pull up cables 132a and 132b are coupled with equalizer bar 120. In this way, the tension (i.e. forces F2 and F3) of pull up cables 132a and 132b is applied to slack take up device 110 through equalizer bar 120. Hence, equalizer bar 120 is coupled to rotary head 106 through a pulley system which includes pulleys 133a, 133b, 133c and 133d.
It is desirable to have reference line 125 positioned between reference lines 126 and 127. In particular, it is desirable to have reference line positioned halfway between reference lines 126 and 127. In this way, forces F2 and F3 are driven to equal each other, and equalizer bar 120 is driven to remain level. It is desirable to have equalizer bar 120 remain level in response to pull up cables 132a and 132b raising and lowering rotary head 106. It should be noted that equalizer bar 120 will tilt in response to forces F2 and F3 being unequal to each other. In this way, feed cable system 130 includes an equalizer bar which drives the tension of first and second pull up cables to equal each other in response to first and second pull up cables raising and lowering a rotary head.
Hence, equalizer bar 120 drives the difference in the tension of pull up cables 132a and 132b to zero. Further, equalizer bar 120 drives the difference in the tension (i.e. the difference between forces F2 and F3) of pull up cables 132a and 132b to zero in response to rotary head 106 moving along tower 102. Equalizer bar 120 drives the tension of pull up cables 132a and 132b to equal each other (i.e. forces F2 and F3 are drive to equal each other).
In operation, equalizer bar 120 increases and decreases the tension of pull up cable 132a in response to the tension of pull up cable 132b increasing and decreasing, respectively. Also, equalizer bar 120 increases and decreases the tension of pull up cable 132b in response to the tension of pull up cable 132a increasing and decreasing, respectively.
In operation, equalizer bar 120 drives the tension of pull up cables 132a and 132b to equal each other in response to pull up cables 132a and 132b raising and lowering rotary head 106. Further, equalizer bar 120 drives the difference in the tension of pull up cables 132a and 132b to zero. Equalizer bar 120 drives the difference in the tension of pull up cables 132a and 132b to zero in response to rotary head 106 moving along tower 102.
Rotary head 106 can be moved along tower 102 in many different ways, such as that disclosed in U.S. Patent Application No. 20030056993, wherein pulleys 133c and 135a are coupled together with a pulley support member that is moveable along tower 102. Further, pulleys 133d and 135b are coupled together with another pulley support member that is moveable along tower 102. The pulley support members can be moved along tower 102 in many different ways, such as by connecting them to a hydraulic cylinder 116 of
a and 4b are perspective and side views, respectively, of one embodiment of an equalizer bar, denoted as equalizer bar 120a. In this embodiment, equalizer bar 120a includes an equalizer bar body 121 with openings 124a and 124b extending downwardly therethrough. Further, equalizer bar body 121 includes an opening 123 extending therethrough in a direction perpendicular to openings 124a and 124b. In this embodiment, openings 124a and 124b extend along reference lines 126 and 127, respectively, of
a and 5b are perspective and side views, respectively, of one embodiment of an equalizer bar, denoted as equalizer bar 120b. In this embodiment, equalizer bar 120b includes equalizer bar body 121 with openings 124a and 124b extending downwardly therethrough. Further, equalizer bar body 121 includes an equalizer bar neck 122 extending upwardly from equalizer bar body 121. Opening 123 extends through equalizer bar neck 122 in a direction perpendicular to openings 124a and 124b. In this embodiment, openings 124a and 124b extend along reference lines 126 and 127, respectively, of
a and 6b are side views of equalizer bar 120b coupled with slack take up device 110 and pull up cables 132a and 132b. Equalizer bar 120b can be coupled with pull up cables 132a and 132b in many different ways. In this embodiment, pull up cables 132a and 132b extend upwardly though openings 124a and 124b (
Pull up cables 132a and 132b and pull down cables 134a and 134b can be coupled with rotary head 106 in many different ways. In this embodiment, pull up cables 132a and 132b are coupled with rotary head 106 with u-joints 113b and 113c, respectively. Further, pull down cables 134a and 134b are coupled with rotary head 106 with u-joints 113d and 113e.
Slack take up device 110 can be coupled with equalizer bar 120 in many different ways. In this embodiment, slack take up device 110 includes a u-joint 113a coupled with piston 112, wherein u-joint 113a is coupled to equalizer bar 120 by a pin which extends through opening 123 and u-joint 113a. The pin restricts the ability of u-joint 113a to move away from equalizer bar body 121.
a and 7b are perspective and side views, respectively, of a portion of tower 102 proximate to tower base 102a and table 119. In this embodiment, drilling machine 100 includes a tension adjusting device for adjusting the tension of a pull down cable.
In this particular embodiment, drilling machine 100 includes tension adjusting devices 115 and 116, wherein tension adjusting device 115 is operatively coupled with pull down cable 134b and tension adjusting device 116 is operatively coupled with pull down cable 134a, as shown in
Tension adjusting devices 115 and 116 can be embodied in many different ways. In this embodiment, tension adjusting device 115 includes a threaded rod 115a which is received through an opening of an outer threaded sleeve 115b, wherein threaded rod 115a is coupled with pull down cable 134b and outer threaded sleeve 115b is coupled with table 119. It should be noted that outer threaded sleeve 115b can be coupled directly to table 119, or it can be coupled indirectly to table 119 through another structure. For example, in this embodiment, outer threaded sleeve 115b is coupled with tower 102 through brackets 117a and 117b, and tower 102 is coupled with table 119. In general, however, the movement of outer threaded sleeve 115b upwardly from table 119 is restricted. Hence, the movement of outer threaded sleeve 115b upwardly from table 119 in response to an upwardly directed force applied to outer threaded sleeve 115b is restricted. The upwardly extending fore can be applied to outer threaded sleeve 115b in many different ways, such as by the force applied to pull down cable 134b in response to the weight or rotary head 106. This force is applied to outer threaded sleeve 115b because pull down cable 134b is coupled with outer threaded sleeve 115b through threaded rod 115a.
In this embodiment, tension adjusting device 116 includes a threaded rod 116a which is received through an opening of an outer threaded sleeve 116b, wherein threaded rod 116a is coupled with pull down cable 134a and outer threaded sleeve 116b is coupled with table 119. It should be noted that outer threaded sleeve 116b can be coupled directly to table 119, or it can be coupled indirectly to table 119 through another structure. For example, in this embodiment, outer threaded sleeve 116b is coupled with tower 102 through brackets 118a and 118b, and tower 102 is coupled with table 119. In general, however, the movement of outer threaded sleeve 116b upwardly from table 119 is restricted. Hence, the movement of outer threaded sleeve 116b upwardly from table 119 in response to an upwardly directed force applied to outer threaded sleeve 116b is restricted. The upwardly extending fore can be applied to outer threaded sleeve 116b in many different ways, such as by the force applied to pull down cable 134a in response to the weight or rotary head 106. This force is applied to outer threaded sleeve 116b because pull down cable 134a is coupled with outer threaded sleeve 116b through threaded rod 116a.
In operation, the tension of pull down cable 134b is adjusted in response to rotating threaded rod 115a relative to outer threaded sleeve 115b. Threaded rod 115a can be rotated relative to outer threaded sleeve 115b in many different ways. In this embodiment, tension adjusting device 115 includes an adjustment collar 115c which allows threaded rod 115a to be moved relative to outer threaded sleeve 115b in a controlled manner. Adjustment collar 115c can be embodied in many different ways. In this embodiment, adjustment collar 115c is embodied as a threaded nut which is threadingly engaged with threaded rod 115a. Adjustment collar 115c is rotated about threaded rod 115a to move threaded rod 115a relative to threaded sleeve 115b.
In one particular situation, the tension of pull down cable 134b is increased in response to rotating threaded rod 115a in a direction relative to outer threaded sleeve 115b, and the tension of pull down cable 134b is decreased in response to rotating threaded rod 115a in an opposed direction relative to outer threaded sleeve 115b. The direction and opposed direction are typically clockwise and counter clockwise, respectively. However, in some situations, the direction and opposed direction are counter clockwise and clockwise, respectively. It should be noted that threaded rod 115a moves towards table 119 in response to rotating threaded rod 115a in the direction. Further, threaded rod 115a moves away from table 119 in response to rotating threaded rod 115a in the opposed direction.
In operation, the tension of pull down cable 134a is adjusted in response to rotating threaded rod 116a relative to outer threaded sleeve 116b. Threaded rod 116a can be rotated relative to outer threaded sleeve 116b in many different ways. In this embodiment, tension adjusting device 116 includes an adjustment collar 116c which allows threaded rod 116 to be moved relative to outer threaded sleeve 116 in a controlled manner. Adjustment collar 116c can be embodied in many different ways. In this embodiment, adjustment collar 116c is embodied as a threaded nut which is threadingly engaged with threaded rod 116a. Adjustment collar 116c is rotated about threaded rod 116a to move threaded rod 116a relative to threaded sleeve 116b.
In one particular situation, the tension of pull down cable 134a is increased in response to rotating threaded rod 116a in a direction relative to outer threaded sleeve 116b, and the tension of pull down cable 134a is decreased in response to rotating threaded rod 116a in an opposed direction relative to outer threaded sleeve 116b. The direction and opposed direction are typically clockwise and counter clockwise, respectively. However, in some situations, the direction and opposed direction are counter clockwise and clockwise, respectively. It should be noted that threaded rod 116a moves towards table 119 in response to rotating threaded rod 116a in the direction. Further, threaded rod 116a moves away from table 119 in response to rotating threaded rod 116a in the opposed direction.
One advantage of tension adjusting devices 115 and 116 is that devices 115 and 116 are capable of controlling the tension of the pull down cables with a greater accuracy. Tension adjusting devices 115 is capable of controlling the tension of the pull down cables with a greater accuracy because of the threads of threaded rod 115a and outer threaded sleeve 115b. Tension adjusting devices 116 is capable of controlling the tension of the pull down cables with a greater accuracy because of the threads of threaded rod 116a and outer threaded sleeve 116b. In general, as the number of threads of the threaded rod and outer threaded sleeve increases, the tension of the pull down cables can be controlled with greater accuracy. Further, as the number of threads of the threaded rod and outer threaded sleeve decreases, the tension of the pull down cables can be controlled with less accuracy. Hence, the number of threads of the threaded rods and threaded sleeves are chosen to provide a desired control of the tension of the pull down cables.
The embodiments of the invention described herein are exemplary and numerous modifications, variations and rearrangements can be readily envisioned to achieve substantially equivalent results, all of which are intended to be embraced within the spirit and scope of the invention.
This application claims priority to U.S. Provisional Application No. 61/098,783, filed on Sep. 21, 2008 by the same inventors, the contents of which are incorporated by reference as though fully set forth herein.
Filing Document | Filing Date | Country | Kind | 371c Date |
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PCT/US2009/057736 | 9/21/2009 | WO | 00 | 5/17/2011 |
Publishing Document | Publishing Date | Country | Kind |
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WO2010/033947 | 3/25/2010 | WO | A |
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PCT/US2009/057736 International Search Report and Written Opinion dated Apr. 6, 2011. |
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