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US 6,926,103 B1Granted
Splittable block on a derrick
AssigneeItrec B.V.
InventorsJoop Roodenburg, Anne Klaas De Groot
Life of this patent
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Abstract
The invention is a hoist system for a derrick with a derrick inside, a derrick outside, and a derrick top side; a splittable block connected to the derrick top side; a hoisting cable guided through the splittable block; a moveable trolley with a trolley top side and a trolley bottom side, wherein the trolley is connected to the splittable block and wherein the moveable trolley is removably secured on the derrick; and a hoist winch adapted to pull the hoisting cable over the derrick top side and through the splittable block to move the moveable trolley relative to the derrick.
Claims57
A hoist system comprising
- a. a derrick comprising
- i. a derrick inside;
- ii. a derrick outside;
- and
- iii. a derrick top side;
- b. a splittable block connected to the derrick top side;
- wherein the splittable block comprises a plurality of moveable loose pulleys secured to either the movable trolley or the derrick and a plurality of fixed pulleys secured to the derrick;
- c. a hoisting cable guided through the splittable block;
- d. a moveable trolley comprising a trolley top side and a trolley bottom side, wherein the trolley is connected to the splittable block and wherein the moveable trolley is removably secured on the derrick;
- and
- e. a hoist winch adapted to pull the hoisting cable over the derrick top side and through the splittable block to move the moveable trolley relative to the derrick.
8 more elements
A hoist system for use in casing drilling comprising:
- a. a derrick comprising
- i. a derrick inside;
- ii. a derrick outside;
- iii. a derrick top side;
- and
- iv. a derrick top side opening;
- b. a splittable block connected to the derrick top side, having a splittable block opening aligned with the derrick topside opening;
- c. a trolley comprising a trolley top side and a trolley bottom side, wherein the trolley is connected to the splittable block having a trolley opening disposed in the trolley from the trolley top side through to the trolley bottom side and aligned with the splittable block opening;
- d. the hoist cable winch adapted to pull the hoist cable over the derrick top side and through the splittable block to move the trolley relative to the derrick and lift a load;
- e. a wire winch adapted to pull the wireline over the derrick top side and through the openings for lifting casing drilling equipment;
- f. a hoist cable passing through the splittable block and connected on one end to a hoist cable winch;
- and
- g. a wireline passing through the derrick opening, the splittable block opening, and the trolley opening and connected on a first end to a wire winch.
10 more elements
A method for quickly modifying a hoist system from heavy load lifting to light load lifting comprising the steps:
- a. using a hoist system comprising
- i. a derrick comprising
- 1. a derrick inside;
- 2. a derrick outside;
- and
- 3. a derrick top side;
- ii. a splittable block connected to the derrick top side;
- iii. a hoisting cable guided through the splittable block;
- iv. a moveable trolley comprising a trolley top side and a trolley bottom side, wherein the trolley is connected to the splittable block by the hoisting cable and wherein the moveable trolley is removably secured on the derrick;
- and
- v. a hoist winch adapted to pull the hoisting cable over the derrick top side and through the splittable block to move the moveable trolley relative to the derrick.
- b. disconnecting the heavy load from the trolley;
- c. hoisting the trolley to a first position on the derrick to a disengaging position;
- d. disengaging a portion of loose pulleys from the moveable trolley;
- e. moving the moveable trolley to its working position;
- f. picking up a lighter load;
- and
- g. resuming the hoist system operation.
15 more elements
A method for quickly modifying a hoist system from light load lifting to heavy load lifting comprising the steps:
- a. using a hoist system comprising
- i. a derrick comprising
- 1. a derrick inside;
- 2. a derrick outside;
- and
- 3. a derrick top side;
- ii. a splittable block connected to the derrick top side;
- iii. a hoisting cable guided through the splittable block;
- iv. a moveable trolley comprising a trolley top side and a trolley bottom side, wherein the trolley is connected to the splittable block by means of the hoisting cable and wherein the moveable trolley is removably secured on the derrick;
- and
- v. a hoist winch adapted to pull the hoisting cable over the derrick top side and through the splittable block to move the moveable trolley relative to the derrick;
- b. disconnecting the light load from the trolley;
- c. hoisting the moveable trolley to a first position on the derrick;
- d. engaging a portion of loose pulleys with the moveable trolley;
- e. picking up a heavier load;
- and
- f. resuming the hoist system operation.
14 more elements
A method for casing drilling operations using a hoist system comprising the steps:
- a. using a hoist system comprising
- i. a derrick comprising
- 1. a derrick inside;
- 2. a derrick outside;
- 3. a derrick top side;
- and
- 4. a derrick top side opening;
- ii. a splittable block connected to the derrick top side, having a splittable block opening aligned with the derrick topside opening;
- iii. a trolley comprising a trolley top side and a trolley bottom side, wherein the trolley top side is connected to the splittable block having a trolley opening disposed in the trolley from the trolley top side through to the trolley bottom side and aligned with the splittable block opening;
- iv. the hoist cable winch adapted to pull the hoist cable over the derrick top side and through the splittable block to move the trolley relative to the derrick and lift a load;
- v. a wire winch adapted to pull the wireline over the derrick top side and through the openings for lifting casing drilling equipment;
- vi. a hoist cable passing through the splittable block and connected on one end to a hoist cable winch;
- and
- vii. a wireline passing through the derrick opening, the splittable block opening, and the trolley opening and connected on a first end to a wire winch;
- b. connecting the drilling casing to the casing drilling equipment mounted on the trolley;
- c. drilling a subsea well with the casing drilling equipment with connected drilling casing having a drill bit;
- d. engaging retrieval tools to the wireline;
- e. lowering the retrieval tools through the drilling casing connected to the trolley;
- f. locking the retrieval tools to the drill bit using a lock;
- g. disconnecting the drill bit from the drilling casing and hoist the drill bit with the wire and wire winch;
- and
- h. resuming the hoist system and drilling operations.
19 more elements
Dependencies are inferred from the claim text.