Drilling rig masts and methods of assembly and erecting masts

• US 8,549,815 B2
• Filed: 02/29/2008
• Issued: 10/08/2013
• Est. Priority Date: 02/29/2008
• Status: Active Grant

• Current Assignee: National Oilwell Varco LP (NOV, Inc.)
• Original Assignee: National Oilwell Varco LP (NOV, Inc.)
• Inventors: Donnally, Robert Benjamin, Ren, Chunqiao, McCurdy, Stuart Arthur Lyall, Yu, Yan, Liu, Xi Lin, Sheng, Hui Chun
• Primary Examiner(s): A, Phi
• Application Number:
  US12/074,258
• Publication Number:
  US 20090218144A1
• Time in Patent Office: 2,048 Days
• Field of Search: 521/231, 521/11, 521/17, 521/18, 521/20, 527/451.7, 527/451.8, 173/28, 173/1, 173/24, 173/85, 173/161, 173/184
• US Class Current: 52/745.17
• CPC Class Codes: E21B 15/00 Supports for the drilling machine, e.g. derricks or masts
• CPC Class Codes: E21B 7/02 Drilling rigs characterised by means for land transport with their own drive, e.g. skid mounting or wheel mounting

Abstract

Methods for connection parts of a mast of a drilling rig without using a crane or other lifting machine are disclosed. In certain aspects, these methods include moving parts of a mast to be assembled with trucks and positioning the parts with the trucks to facilitate their connection. This Abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure and is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims, 37 C.F.R. 1.72(b).

Claims

1. A method for connecting two parts of a mast of a drilling rig, the method comprising:

positioning a substructure at a location, said substructure having an open area therein that is defined by a space between a first side of said substructure and a second side of said substructure, said open area being adapted to at least partially receive a bottom mast section of said mast;

positioning said bottom mast section at least partially in said open area, the bottom mast section having a bottom connection apparatus,

moving a second mast section adjacent the bottom mast section, the second mast section having a second connection apparatus, and

moving the bottom mast section so that the bottom connection apparatus contacts the second connection apparatus and engages the second connection apparatus to attach the bottom mast section to the second mast section.

2. The method of claim 1, wherein moving said second mast section comprises releasably coupling said second mast section to a vehicle and wherein the method further comprises:

releasing the second mast section from the vehicle, and

moving the vehicle away from the second mast section.

3. The method of claim 2 further comprising raising the mast comprising the bottom mast section that is attached to the second mast section.

4. The method of claim 1 wherein said substructure comprises a raising apparatus, the method further comprising raising the substructure with the raising apparatus to move the bottom mast section with respect to the second mast section to facilitate engagement of the bottom connection apparatus with the second connection apparatus.

5. The method of claim 1 further comprising locking together the bottom connection apparatus and the second connection apparatus.

6. The method of claim 1 wherein:

the bottom mast section comprises a jaw member connected to the bottom mast section, the jaw member having a throat and a slot,

the second connection apparatus comprises an insertion member with a bar,

the insertion member being sized and located such that an end of the insertion member is adapted to be positioned in the throat of the jaw member and the bar is sized and located for positioning within the slot,

the method further comprising;

moving the bottom mast section to move the end of the insertion member into the throat and to move the bar into the slot.

7. The method of claim 1 wherein:

the bottom mast section comprises a jaw member with two spaced-apart plates, each with a flared portion and a throat defined between the flared portions, and wherein the second mast section has an insertion member with an end that is adapted to be positioned in said throat,

the method further comprising;

moving an end of the insertion member into the throat.

8. The method of claim 1 wherein:

the bottom mast section comprises two legs, each with a jaw member connected thereto, each jaw member comprising a throat and a slot,

the second mast section comprises a plurality of second connection apparatus, each second connection apparatus comprising an insertion member and a bar,

each of the insertion members being sized and located such that an end of the insertion members is adapted to be positioned in the throat of a corresponding jaw member and the bar is sized and located for positioning within the slot of the corresponding jaw member,

the method further comprising;

moving the bottom mast section to move the ends of the insertion members into the throats and to move the bars into the slots.

9. The method of claim 1 wherein, prior to moving said bottom section, positioning said bottom mast section and said second mast section such that they slope downwardly toward each other.

10. The method of claim 1 wherein:

the bottom mast section has a third connection member connected thereto and spaced-apart from the bottom connection apparatus,

the second mast section has a fourth connection member connected thereto and spaced apart from said second connection apparatus,

the method further comprising;

securing the fourth connection member to the third connection member.

11. The method of claim 10 wherein the third connection member has two spaced-apart plates, each with an outwardly flared portion, and includes a throat between the outwardly flared portions of the two spaced-apart plates for facilitating entry of part of the fourth connection apparatus between the two spaced-apart plates.

12. The method of claim 1 wherein:

the bottom mast section has two legs, each with a third connection member connected thereto and spaced-apart from said bottom connection apparatus,

the second mast section has two legs, each with a fourth connection member connected thereto,

the method further comprising;

securing the fourth connection members to the third connection members.

13. The method of claim 12 wherein the third connection members each have two spaced-apart plates, each with an outwardly flared portion, and include a throat between the outwardly flared portions of the two spaced-apart plates for facilitating entry of the fourth connection apparatuses between the two spaced-apart plates.

14. The method of claim 1, wherein said open area is further adapted to at least partially receive a vehicle that is adapted to position said bottom mast section at least partially in said open area, and wherein positioning said bottom mast section at least partially in said open area comprises:

releasably coupling said bottom mast section to said vehicle;

positioning said vehicle at least partially in said open area between said first and second sides of said substructure;

releasing said bottom mast section from said vehicle; and

moving said vehicle away from said bottom mast section.

15. The method of claim 2, wherein said open area is further adapted to at least partially receive said vehicle, the method further comprising positioning said vehicle at least partially in said open area prior to releasing said second mast section.

16. The method of claim 14, further comprising pivotably connecting said bottom mast section to a plurality of mast shoes on said substructure.

17. The method of claim 16, further comprising pivotably connecting a mast raising apparatus to said bottom mast section and said substructure, and using said mast raising apparatus to raise at least said bottom mast section.