PORTABLE DRILLING RIG APPARATUS AND ASSEMBLY METHOD
A portable drilling rig apparatus includes a rig floor having a pedestal structure thereon, the pedestal structure comprising a lower pivot point and a lower attachment point and wherein the pedestal structure is configured to be rotated to a vertical position about the lower pivot point. The drilling rig further includes a mast structure having a mast pivot point at a lower end of the mast structure wherein the mast pivot point is configured to be pinned to an upper pivot point of the pedestal structure.
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1. Field of the Disclosure
Embodiments disclosed herein relate generally to drilling rigs. In particular, embodiments disclosed herein relate to portable drilling rig apparatuses and related methods of assembly.
2. Background Art
A drilling rig is used to drill a wellbore in a formation. Drilling rigs may be large structures that house equipment used to drill water wells, oil wells, or natural gas extraction wells. Drilling rigs sample sub-surface mineral deposits, test rock, soil and groundwater physical properties, and may also be used to install sub-surface fabrications, such as underground utilities, instrumentation, tunnels or wells. Drilling rigs may be mobile equipment mounted on trucks, tracks, or trailers, or more permanent land or marine-based structures (such as oil platforms). The term “rig,” therefore, generally refers to a complex of equipment that is used to penetrate the surface of the earth's crust.
Referring to
The drilling rig 30 further includes a rotary table 20 mounted in a rig floor 21, which is used to rotate the drillstring 25 along with a kelly drive 19. Kelly drive 19, attached at an upper end to the swivel 18 and at a lower end to the drillstring 25, is inserted through the rotary table 20 to rotate the drillstring 25 (drillstring rotation shown by arrow “R”). Kelly drive 19 may be square, hexagonal, or any other polygonal-shaped tubing and is able to move freely vertically while the rotary table 20 rotates it. Alternatively, drilling rig 30 may include a top drive (not shown) in place of kelly drive 19 and rotary table 20. Additionally, blowout preventers (“BOPs”) may be located below the rig floor 21 and installed atop a wellhead 27 to prevent fluids and gases from escaping from the wellbore. An annular BOP 23 and one or more ram BOPs 24 are shown and are commonly understood in the art.
During drilling operations, drilling fluid may be circulated through the system to carry cuttings away from the bottom of the wellbore as drilling progresses. Drilling fluid may be stored in mud tanks 1 before being drawn through suction line 3 by mud pumps 4. Drilling fluid (drilling fluid route is indicated by arrows “F”) is then pumped from mud pumps 4 through a hose 6, up a stand pipe 8, through a flexible hose 9, and down into the wellbore. Drilling fluid returning from the wellbore is routed through a flow line 28 to shakers 2, which are used to separate drill cuttings from the drilling fluid before it is pumped back down the wellbore.
Drilling rigs may add considerable cost to the overall costs of extracting oil or natural gas from underground reservoirs. This may be due to large equipment needed to erect certain drilling rigs or the difficulty of erecting certain drilling rigs in remote locations where it may be more costly to transport the drilling rig. Also, certain oil and natural gas wells may have a relatively limited well life, i.e., the well has only a limited amount of gas or oil capable of being extracted. Because of the reduced production, to maintain profitable margins from drilling and producing such a well, a less expensive drilling rig would be desirable. Thus, there exists a need for an economical drilling rig capable of being transported to remote and difficult to reach locations.
SUMMARY OF THE DISCLOSUREIn one aspect, embodiments disclosed herein relate to a portable drilling rig apparatus including a rig floor having a pedestal structure thereon, the pedestal structure comprising a lower pivot point and a lower attachment point and wherein the pedestal structure is configured to be rotated to a vertical position about the lower pivot point. The drilling rig further includes a mast structure having a mast pivot point at a lower end of the mast structure wherein the mast pivot point is configured to be pinned to an upper pivot point of the pedestal structure.
In other aspects, embodiments disclosed herein relate to a method to assemble a portable drilling rig, the method including providing a pedestal structure on a rig floor, the pedestal structure comprising a lower pivot point, a lower attachment point, and an upper pivot point. The method further includes aligning a mast structure and the pedestal structure, pinning a mast pivot point located at a lower end of the mast structure to the upper pivot point of the pedestal structure, and pivoting the pedestal structure from a substantially horizontal position to a vertical position. Further, the method includes moving the mast structure in a horizontal direction toward a center of the rig floor, securing the lower attachment point of the pedestal structure to a corresponding attachment point on the rig floor, erecting the mast structure from a substantially horizontal position to a vertical position about a pivot point between the mast structure and the pedestal structure, and securing the mast structure in a vertical position.
In other aspects, embodiments disclosed herein relate to a method to assemble a portable drilling rig, the method including attaching a mast structure to a pedestal structure on a rig floor and pivoting the pedestal structure from a horizontal position to a vertical position about a lower pivot point and securing the pedestal structure to the rig floor.
In other aspects, embodiments disclosed herein relate to an apparatus to restrict axial movement between an inner mast section and an outer mast section, the apparatus including a latch mechanism pivotably connected to the inner mast section wherein the latch mechanism is configured to move between a collapsed position and an extended position. The apparatus further includes a first cutout formed in an outer surface of the inner mast section wherein the latch mechanism sits flush with the outer surface of the inner mast section when the latch mechanism is in the collapsed position, and a second cutout formed in an inner surface of the outer mast section, wherein the latch mechanism is configured to be extended radially and engage the second cutout in the inner surface of the outer mast section.
Other aspects and advantages of the invention will be apparent from the following description and the appended claims.
In one aspect, embodiments disclosed herein relate to portable drilling rig apparatuses and related methods of assembling the portable drilling rig.
Referring to
Drilling rig 100 may further include a pedestal structure 130 that may be mounted on rig floor 122 and configured to link mast structure 110 and rig floor 122, as well as aid with assembly of the drilling rig 100. Pedestal structure 130 may include an upper attachment point 132 configured to be pinned to a mast pivot point 112 during assembly. Pedestal structure 130 may also include a lower pivot point 134, which is pinned to rig floor 122, about which pedestal structure 130 may pivot and a lower attachment point 136 where pedestal structure is pinned to rig floor 112 after being positioned in a vertical position, as explained later. Initially, as shown in
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As such, when mast sections are extended (e.g., as shown in
Advantageously, embodiments of the present disclosure for a highly mobile and economical drilling rig capable of reaching remote well locations. The unique pedestal structure eliminates a need for large cranes or other lifting equipment typically required to erect a mast structure, making the drilling rig easily portable to various locations. Additionally, because less equipment is required for assembly, initial assembly costs for setting up the drilling rig may be reduced, which in turn may increase profit margins from smaller or limited production wells.
While the present disclosure has been described with respect to a limited number of embodiments, those skilled in the art, having benefit of this disclosure, will appreciate that other embodiments may be devised which do not depart from the scope of the disclosure as described herein. Accordingly, the scope of the disclosure should be limited only by the attached claims.
Claims
1. A portable drilling rig apparatus comprising:
- a rig floor having a pedestal structure thereon;
- the pedestal structure comprising a lower pivot point and a lower attachment point;
- wherein the pedestal structure is configured to be rotated to a vertical position about the lower pivot point;
- a mast structure having a mast pivot point at a lower end of the mast structure;
- wherein the mast pivot point is configured to be pinned to an upper pivot point of the pedestal structure.
2. The apparatus of claim 1, further comprising at least one hydraulic cylinder configured to pivot the mast structure about the mast pivot point to erect the mast structure.
3. The apparatus of claim 2, wherein at least one end of the at least one hydraulic cylinder is configured to be removably attachable at multiple locations on the rig floor.
4. The apparatus of claim 1, wherein the rig floor is hydraulically actuated to be elevated to a specified height.
5. The apparatus of claim 1, the mast structure further comprising at least one mast leg configured to secure the mast structure in a vertical position.
6. The apparatus of claim 1, wherein the mast structure further comprises telescoping mast sections.
7. The apparatus of claim 6, further comprising a latch configured to restrict movement between an inner mast section and an outer mast section of the mast structure.
8. The apparatus of claim 6, wherein the telescoping mast sections are hydraulically extended.
9. A method to assemble a portable drilling rig, the method comprising:
- providing a pedestal structure on a rig floor;
- the pedestal structure comprising a lower pivot point, a lower attachment point, and an upper pivot point;
- aligning a mast structure and the pedestal structure;
- pinning a mast pivot point located at a lower end of the mast structure to the upper pivot point of the pedestal structure;
- pivoting the pedestal structure from a substantially horizontal position to a vertical position;
- moving the mast structure in a horizontal direction toward a center of the rig floor;
- securing the lower attachment point of the pedestal structure to a corresponding attachment point on the rig floor;
- erecting the mast structure from a substantially horizontal position to a vertical position about a pivot point between the mast structure and the pedestal structure;
- securing the mast structure in a vertical position.
10. The method of claim 9, further comprising elevating the rig floor to a specified height.
11. The method of claim 9, further comprising extending a mast leg from the mast structure to the rig floor to secure the mast structure in a vertical position.
12. The method of claim 9, wherein erecting the mast structure comprises extending at least one hydraulic cylinder attached to the mast structure and the rig floor.
13. The method of claim 12, further comprising extending multiple telescoping mast sections of the mast structure to a final height.
14. The method of claim 13, further comprising latching the multiple telescoping mast sections to prevent relative movement.
15. A method to assemble a portable drilling rig, the method comprising:
- attaching a mast structure to a pedestal structure on a rig floor; and
- pivoting the pedestal structure from a horizontal position to a vertical position about a lower pivot point and securing the pedestal structure to the rig floor.
16. The method of claim 15, further comprising erecting the mast structure to a vertical position about a pivot point of the pedestal structure.
17. An apparatus to restrict axial movement between an inner mast section and an outer mast section, the apparatus comprising:
- a latch mechanism pivotably connected to the inner mast section;
- wherein the latch mechanism is configured to move between a collapsed position and an extended position;
- a first cutout formed in an outer surface of the inner mast section;
- wherein the latch mechanism sits flush with the outer surface of the inner mast section when the latch mechanism is in the collapsed position;
- a second cutout formed in an inner surface of the outer mast section;
- wherein the latch mechanism is configured to be extended radially and engage the second cutout in the inner surface of the outer mast section.
18. The apparatus of claim 17, further comprising a spring configured to bias the latch mechanism into the extended position.
19. The apparatus of claim 17, further comprising a cable to move the latch between the collapsed position and the extended position.
20. The apparatus of claim 17, wherein the latch mechanism is configured to provide a path for load forces from the inner mast section to be transmitted to the outer mast section.
Type: Application
Filed: Sep 28, 2009
Publication Date: Mar 31, 2011
Applicant: INTERNATIONAL DRILLING EQUIPMENT COMPANY, LLC (Spring, TX)
Inventor: Philip Wasterval (Edwards, CO)
Application Number: 12/568,489
International Classification: E21B 7/02 (20060101); E21B 15/00 (20060101); F16B 1/00 (20060101); E04H 12/34 (20060101);