Drilling rig equipped with pairs of block and tackle systems
First Claim
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1. That improvement in a drilling rig having a tower equipped at its top with equipment support means which comprises:
- a pair of spaced apart cranks mounted on stationary support means for pivotal movement solely in respective coplanar arcs overlying a horizontal plane through the pivot axes of said cranks;
a separate block and tackle means having the crown blocks thereof journalled on a respective crank pin of said cranks; and
power means operatively connected to said cranks for pivoting the same in the same direction in unison through respective arcs overlying said horizontal plane and between first and second operating positions of said block and tackle means located on the opposite sides of a respective vertical plane through the pivot axis of a respective one of said cranks.
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Abstract
This invention relates to drilling rigs, and more particularly to novel apparatus for supporting a plurality of pairs of block and tackle systems with the tackle systems of each pair operable sequentially and alternately, the one being used to support a main drilling or tubing string while the other is being used to rack stands of tubing therefrom.
43 Citations
34 Claims
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1. That improvement in a drilling rig having a tower equipped at its top with equipment support means which comprises:
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a pair of spaced apart cranks mounted on stationary support means for pivotal movement solely in respective coplanar arcs overlying a horizontal plane through the pivot axes of said cranks; a separate block and tackle means having the crown blocks thereof journalled on a respective crank pin of said cranks; and power means operatively connected to said cranks for pivoting the same in the same direction in unison through respective arcs overlying said horizontal plane and between first and second operating positions of said block and tackle means located on the opposite sides of a respective vertical plane through the pivot axis of a respective one of said cranks. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. That improvement in a drilling rig which comprises:
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a main frame mounted non-rotatably adjacent the top of a drilling rig derrick; a pair of generally similar cranks having parallel shaft means journalled on said main frame each supporting on the crank pin thereof the crown block of a respective block and tackle system, the axes of said crank shaft means being spaced apart horizontally by approximately double the distance between the axis of the crank shaft means and the axis of the crank pin thereof; and means for rotating each of said cranks through respective arcs overlying the axes of said crank shaft means thereby to transfer a respective one of said block and tackle systems between the opposite lateral sides of the associated one of said crank shaft means. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. That improvement in a well bore drilling rig which comprises:
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a main frame fixedly secured to the top of a derrick for said well bore; a pair of spaced apart block and tackle systems suspended from said main frame for use in servicing tubing stands of a well bore and including power driven means for simultaneously bodily raising and then simultaneously lowering said block and tackle systems, including the crown blocks thereof, while shifting one thereof laterally toward a well bore and the other laterally away from a well bore whereby one of said systems is available for attachment to a main tubing string. - View Dependent Claims (27, 28, 29, 31, 32, 33, 34)
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30. In a drilling rig having a derrick and a pair of draw works for a respective pair of block and tackle systems that improvement which comprises:
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a main frame mounted adjacent the top of said derrick; a pair of cranks journalled on said main frame each supporting the crown block of a respective one of said block and tackle systems; and power means for rotating said cranks to position one of said block and tackle means over a well bore midway between the journals of said cranks while the other one thereof is displaced laterally away from said well bore.
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Specification