Dual hoist system

A multiple lift hoist system of for a drilling vessel comprising:

• a. a mast having a top side and a base connected to a drilling vessel, wherein the mast is has a hollow construction for supporting a first hoisting device and a second hoisting device at the top side;
• b. the first hoisting device located in a first firing line that manipulates a first drill string in a longitudinal direction of the mast;
• c. the second hoisting device located in a second firing line that manipulates a second drill string in the longitudinal direction of the mast;
• d. a plurality of cables and a plurality of winches disposed in the hollow construction to manipulate the position of the first hoisting devices and the second hoisting devices relative to the mast so the first firing lines and the second firing lines are accessible from the outside of the mast;
• and
• e. a first setback and a second setback are disposed besides the mast and a first piperacker and a second piperacker are disposed beside the mast.

A multiple lift hoist system for a drilling vessel comprising:

• a. a mast having a top side and a base connected to a drilling vessel, wherein the mast is has a hollow construction for supporting a first hoisting devices and a second hoisting device at the top side;
• wherein the mast accommodates a retraction system to retract equipment from the firing line into the inside of the mast;
• b. the first hoisting device located in a first firing line that manipulates a first drill string in a longitudinal direction of the mast;
• c. the second hoisting device located in second firing line that manipulates a second drill string in the longitudinal direction of the mast;
• and
• d. a plurality of cables and a plurality of winches disposed in the hollow construction to manipulate the position of the first hoisting devices and the second hoisting devices relative to the mast so the first firing lines and the second firing lines are accessible from the outside of the mast.

A multiple lift hoist system for a drilling vessel comprising:

• a. a mast having a out side and a base connected to a drilling vessel, wherein the mast is has a hollow construction for supporting a first hoisting device and a second hoisting device at the side;
• b. the first hoisting device located in a first firing line that manipulates a first drill string in a longitudinal direction of the mast;
• c. the second hoisting device located in a second firing line that manipulates a second drill string in the longitudinal direction of the mast;
• d. a plurality of cables and a plurality of winches disposed in the hollow construction to manipulate the position of the first hoisting devices and the second hoisting devices relative to the mast so the first firing lines and the second firing lines are accessible from the outside of the mast;
• and
• e. a storage area in the mast is located at the upper side of the mast for accommodating equipment that is placed in the firing line during normal operation of the drilling vessel.

A multiple lift hoist system for use on land comprising:

• a. a mast having a top side and a base connected to land, wherein the mast has a hollow construction for supporting a first hoisting device and a second hoisting device at the top side;
• b. the first hoisting device located in a first firing line that manipulates a first drill string in a longitudinal direction of the mast;
• c. the second hoisting device located in a second firing line that manipulates a second drill string in the longitudinal direction of the mast;
• and
• d. a plurality of cables and a plurality of winches disposed in the hollow construction to manipulate the position of the first hoisting devices and the second hoisting devices relative to the mast so the first firing lines and the second firing lines are accessible from the outside of the mast.

A multiple lift hoist system for use on land comprising

• a. a mast having a top side and a base connected to land, wherein the mast has a hollow construction for supporting a first hoisting device and a second hoisting device at the top side;
• b. the first hoisting device located in a first firing line that manipulates a first drill string in a longitudinal direction of the mast;
• c. the second hoisting device located in a second firing line that manipulates a second drill string in the longitudinal direction of the mast;
• d. a plurality of cables and a plurality of winches disposed in the hollow construction to manipulate the position of the first hoisting devices and the second hoisting devices relative to the mast so the first firing lines and the second firing lines are accessible from the outside of the mast;
• and
• e. a first setback and a second setback are disposed besides the mast and a first piperacker and a second piperacker are disposed beside the mast.

A multiple lift hoist system for use on land comprising:

• a. a mast having a top side and a base connected to land, wherein the mast has a hollow construction for supporting a first hoisting device and a second hoisting device at the top side;
• wherein the mast accommodates a retraction system to retract equipment from the firing line into the inside of the mast;
• b. the first hoisting device located in a first firing line that manipulates a first drill string in a longitudinal direction of the mast;
• c. the second hoisting device located in a second firing line that manipulates a second drill string in the longitudinal direction of the mast;
• d. a plurality of cables and a plurality of winches disposed in the hollow construction to manipulate the position of the first hoisting devices and the second hoisting devices relative to the mast so the first firing lines and the second firing lines are accessible from the outside of the mast.