Method of repairing tubular members on oil and gas wells

A method of repairing an offshore oil well having a platform with an oil well that has a larger diameter drive pipe, a smaller diameter inner casing string inside the outer drive pipe having a damaged section, and a production flow line inside the inner casing string, comprising the steps of:

• a) removing a section of the outer drive pipe to provide an upper edge;
• b) installing a sleeve on the casing string that spans between upper and lower positions on the casing string and covers the damaged section, the sleeve having a longitudinal slot that enables it to be opened for installing the sleeve around the casing string;
• c) welding the sleeve to the casing string with a pair of girth welds;
• and
• d) closing the sleeve slot with a longitudinally extending connection.

A method of structurally reinforcing an oil well that has an assembly of tubular members in a marine environment, the assembly including a smaller diameter flowline inside of a larger diameter casing string that has a damaged portion, the casing string being inside an outer tubular member, comprising the steps of:

• a) providing a first annulus in between the flow casing and casing string;
• b) providing a second annulus in between the casing string and outer tubular member;
• c) removing a section of the outer tubular member to expose the damaged portion;
• d) covering the damaged portion of the casing string with a repair sleeve;
• e) attaching the sleeve to the casing string above and below the damaged portion of the casing string with upper and lower attachments, at least one of said attachments being a girth weld that attaches a bottom part of the sleeve to the casing string;
• and
• f) pumping a volume of a rout product into the second annulus.

A method of structurally reinforcing an oil well that has an assembly of tubular members in a marine environment, the assembly including a smaller diameter flowline inside of a larger diameter casing string that has a damaged portion, the casing string being inside an outer tubular member, comprising the steps of:

• a) providing a first annulus in between the flow casing and casing string;
• b) providing a second annulus in between the casing string and outer tubular member;
• c) removing a section of the outer tubular member to expose the damaged portion;
• d) covering the damaged portion of the casing string with a repair sleeve;
• e) attaching the sleeve to the casing string above and below the damaged portion of the casing string with upper and lower attachments, at least one of said attachments being a girth weld that attaches a bottom part of the sleeve to the casing string;
• and
• f) pumping a volume of a rout product into the second annulus;
• g) wherein the sleeve is metallic section of differing respective diameters.

A method of structurally reinforcing an oil well that has an assembly of tubular members in a marine environment, the assembly including a smaller diameter flowline inside of a larger diameter casing string that has a damaged portion, the casing string being inside an outer tubular member, comprising the steps of:

• a) providing a first annulus in between the flow casing and casing string;
• b) providing a second annulus in between the casing string and outer tubular member;
• c) removing a section of the outer tubular member to expose the damaged portion;
• d) covering the damaged portion of the casing string with a repair sleeve;
• e) attaching the sleeve to the casing string above and below the damaged portion of the casing string with upper and lower attachments, at least one of said attachments being a girth weld that attaches a bottom part of the sleeve to the casing string;
• and
• f) pumping a volume of a rout product into the second annulus
• g) attaching a second sleeve to the assembly;
• h) adding grout to each annulus.