Downhole swivel apparatus and method
First Claim
1. A method of removing fluid from a well bore and riser, the method comprising the following steps:
- (a) attaching a swivel to a drill string, the swivel including a mandrel and a sleeve, the sleeve being rotatably connected to the mandrel;
(b) inserting the swivel into the riser, the riser being fluidly connected to the well bore, the riser and well bore being fluidly connected to a blowout preventer, the blow-out preventer being located at a first level, the riser and well bore being at least partially filled with a first fluid, the first fluid being at a level in the riser which is above the first level;
(c) detachably connecting the blowout preventer to the sleeve thereby separating the first fluid into an upper section of the first fluid, located above the first level, and a lower section of the first fluid, located below the first level;
(d) displacing a portion of the lower section of the first fluid;
(e) displacing a portion of the upper section of the first fluid; and
(f) wherein in step “
a”
the sleeve includes at least one catch, the catch tending to restrict longitudinal movement of the sleeve relative to the blow out preventer.
1 Assignment
0 Petitions
Accused Products
Abstract
What is provided is a method and apparatus which can be detachably connected to an annular blowout preventer thereby separating the drilling fluid or mud into upper and lower sections and allowing the fluid to be displaced in two stages, such as while the drill string is being rotated and/or reciprocated. In one embodiment the sleeve can be rotatably and sealably connected to a mandrel. The swivel can be incorporated into a drill or well string and enabling string sections both above and below the sleeve to be rotated in relation to the sleeve. In one embodiment the drill or well string does not move in a longitudinal direction relative to the swivel. In one embodiment, the drill or well string does move longitudinally relative to the sleeve of the swivel.
138 Citations
65 Claims
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1. A method of removing fluid from a well bore and riser, the method comprising the following steps:
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(a) attaching a swivel to a drill string, the swivel including a mandrel and a sleeve, the sleeve being rotatably connected to the mandrel; (b) inserting the swivel into the riser, the riser being fluidly connected to the well bore, the riser and well bore being fluidly connected to a blowout preventer, the blow-out preventer being located at a first level, the riser and well bore being at least partially filled with a first fluid, the first fluid being at a level in the riser which is above the first level; (c) detachably connecting the blowout preventer to the sleeve thereby separating the first fluid into an upper section of the first fluid, located above the first level, and a lower section of the first fluid, located below the first level; (d) displacing a portion of the lower section of the first fluid; (e) displacing a portion of the upper section of the first fluid; and (f) wherein in step “
a”
the sleeve includes at least one catch, the catch tending to restrict longitudinal movement of the sleeve relative to the blow out preventer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39)
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40. A swivel comprising:
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(a) a mandrel having upper and lower end sections and connected to and rotatable with upper and lower drill or work string sections, the mandrel including a longitudinal passage forming a continuation of a passage in the drill or work string sections; (b) a sleeve having a longitudinal sleeve passage, the sleeve being rotatably connected to the mandrel by a pair of longitudinally spaced bearings; (c) a seal between upper and lower end portions of the mandrel and sleeve, the seal preventing leakage of fluid between the mandrel and sleeve, wherein the sleeve includes at least one catch, the catch tending to restrict longitudinal movement of the sleeve relative to a blow out preventer when the swivel detachably connected to the blowout preventer. - View Dependent Claims (41, 42, 43, 44, 45)
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46. A swivel insertable into a drill or work string comprising:
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(a) a mandrel having upper and lower end sections and connected to and rotatable with upper and lower drill or work string sections, the mandrel including a longitudinal passage forming a continuation of a passage in the drill or work string sections; (b) a sleeve having a longitudinal sleeve passage, the sleeve being rotatably connected to the mandrel by a pair of longitudinally spaced bearings; (c) a pair of spaced apart packing units between upper and lower end portions of the mandrel and sleeve, the packing units preventing leakage of fluid between the mandrel and sleeve, the packing units each comprising a rope seal; and (d) the sleeve restricting fluid flow between its interior and exterior sections. - View Dependent Claims (47, 48, 49, 50, 51, 52, 53, 54, 55, 56)
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57. A swivel insertable into a drill or work string comprising:
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(a) a mandrel having upper and lower end sections and connected to and rotatable with upper and lower drill or work string sections, the mandrel including a longitudinal passage forming a continuation of a passage in the drill or work string sections; (b) a sleeve having a longitudinal sleeve passage, the sleeve being rotatably connected to the mandrel by a pair of longitudinally spaced bearings; (c) a pair of spaced apart packing units between upper and lower end portions of the mandrel and sleeve, the packing units preventing leakage of fluid between the mandrel and sleeve, the packing units each comprising a plurality of rope seals; (d) the sleeve comprising an inlet port positioned between the spaced bearings; and (e) a coated section located in the vicinity of at least one of the packing units. - View Dependent Claims (58)
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59. A swivel comprising:
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(a) a mandrel having upper and lower end sections and connected to and rotatable with upper and lower drill or work string sections, the mandrel including a longitudinal passage forming a continuation of a passage in the drill or work string sections; (b) a sleeve having a longitudinal sleeve passage, the sleeve being rotatably connected to the mandrel by a pair of longitudinally spaced bearings; (c) a seal between upper and lower end portions of the mandrel and sleeve, the seal preventing leakage of fluid between the mandrel and sleeve, and (d) the sleeve being reciprocable between the upper and lower end sections of the mandrel. - View Dependent Claims (60, 61, 62, 63, 64, 65)
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Specification