Production riser
First Claim
1. A marine riser for connecting from a tension moored floating structure to a submarine, mud line suspended, casing and casing hanger, comprisinga tubular riser,a flexible joint,means connecting the flexible joint to the casing near the casing hanger,means connecting the tubular riser to the flexible joint,said tubular riser extending from said flexible joint to the floating structure,means on said floating structure for tensioning said tubular riser,first means for providing lateral support for said tubular riser from said floating structure at water depths greater than fifty feet, andsecond means on the floating structure for providing lateral support for said tubular riser from said floating structure.
1 Assignment
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Accused Products
Abstract
A riser for production of oil and gas in a marine location with the riser connected to the casing supported at the mud line of a body of water and extending upward in the water to a tension moored floating structure. The riser includes a flexible joint near its connection to the casing and is supported at its upper end from the floating structure and is also supported from the floating structure at a point between 50 and 175 feet below the water level. A production string extends upwardly from the producing zone through the casing, the flexible joint and the riser to the floating structure and wellhead equipment is supported on such riser. Centralizers are provided for the production string with the centralizer immediately above the flexible joint being between 35 to 65% of the total distance between such centralizer and the centralizer positioned immediately below the flexible joint.
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Citations
12 Claims
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1. A marine riser for connecting from a tension moored floating structure to a submarine, mud line suspended, casing and casing hanger, comprising
a tubular riser, a flexible joint, means connecting the flexible joint to the casing near the casing hanger, means connecting the tubular riser to the flexible joint, said tubular riser extending from said flexible joint to the floating structure, means on said floating structure for tensioning said tubular riser, first means for providing lateral support for said tubular riser from said floating structure at water depths greater than fifty feet, and second means on the floating structure for providing lateral support for said tubular riser from said floating structure.
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11. A marine riser system connecting from a tension moored floating structure to a plurality of submarine, mud line suspended casings and casing hangers, comprising
a plurality of flexible joints connected to the casings, a plurality of tubular risers connected to said flexible joints, means on the floating structure for tensioning said tubular risers, and means releasably interconnecting said tubular risers at a position above said flexible joints and below said floating structure whereby said risers provide support for each other, connection and release of said interconnecting means being accomplished by axial manipulation of the riser to be connected or released and are held in generally parallel relationship to each other.
Specification