Subsea well intervention systems and methods

A riserless well intervention system comprising:

• a) a lower riser package (LRP) comprising a tree connector, a connector and seal stab adapter (CSSA), and a lower riser package body (LRP body),
• wherein the tree connector comprises an upper flange having a gasket profile for mating to a lower end of the CSSA,
• wherein the CSSA comprises at least one seal stab assembly on its lower end for fluidly connecting to a subsea tree,
• wherein the LRP body comprises one or more LRP sealing elements capable of sealing upon command, and an integral annulus with at least one annulus isolation valve,
• and wherein the LRP body comprises an upper hub profile compatible with a quick disconnect connector and lower flange profile that fluidly mates with the CSSA;
• b) an emergency disconnect package (EDP) removably connected to the LRP, wherein the EDP comprises a body (EDP body) having a quick disconnect connector on its lower end, one or more EDP sealing elements capable of sealing upon command, and at least one annulus isolation valve;
• c) an adapter removably connected to the EDP comprising a lower flange connection and an upper profile for connecting to a subsea lubricator;
• d) a collapse-resistant flexible hose fluidly connecting the LRP to the subsea tree;
• and
• e) the subsea lubricator fluidly connected to the EDP by an adapter.

A marine riser well intervention tie-back system comprising:

• a) a lower riser package (LRP) comprised of a tree connector, a connector and seal stab adapter (CSSA), and a lower riser package body (LRP body),
• wherein the tree connector comprises an upper flange having a gasket profile for mating to a lower end of the CSSA,
• wherein the CSSA comprises at least one seal stab assembly on its lower end for fluidly connecting to a subsea tree,
• wherein the LRP body comprises one or more LRP sealing elements capable of sealing upon command, and an integral annulus with at least one annulus isolation valve, and
• wherein the LRP body comprises an upper hub profile compatible with a quick disconnect connector and lower flange profile that fluidly mates with the CSSA;
• b) an emergency disconnect package (EDP) removably connected to the LRP, wherein the EDP comprises a body (EDP body) having a quick disconnect connector on its lower end, one or more EDP sealing elements capable of sealing upon command, and at least one annulus isolation valve;
• c) an open water completion workover riser system (CWOR), comprised of a riser, a surface tension system, and a surface tree, wherein the riser removably connects the surface tree to the body of the EDP;
• and
• d) a collapse-resistant flexible hose fluidly connecting the LRP to the subsea tree.

A method of well intervention, comprising:

• a) deploying an emergency disconnect package (EDP)/lower riser package (LRP) stack subsea on a subsea tree connected to a well, the EDP/LRP stack being on an end of a marine riser;
• i) wherein the LRP comprises a tree connector, a connector and seal stab adapter (CSSA), and a lower riser package body (LRP body),
• wherein the tree connector comprises an upper flange having a gasket profile for mating to a lower end of the CSSA,
• wherein the CSSA comprises at least one seal stab assembly on its lower end for fluidly connecting to a subsea tree,
• wherein the LRP body is comprised of one or more LRP sealing elements capable of sealing upon command, and an integral annulus with at least one annulus isolation valve,
• wherein the LRP body comprises an upper hub profile compatible with a quick disconnect connector and lower flange profile that fluidly mates with the CSSA;
• ii) wherein the EDP removably connects to the LRP, wherein the EDP comprises a body (EDP body) having a quick disconnect connector on its lower end, one or more EDP sealing elements capable of sealing upon command, and at least one annulus isolation valve, and wherein the EDP body has an internal tie-back profile;
• b) deploying an pressure containing tubulars with an internal tie-back tool (ITBT) attached thereto through the marine riser;
• c) connecting the pressure containing tubulars to a surface flow tree;
• d) landing the ITBT in the body of the EDP and locking the ITBT to the EDP body;
• and
• e) performing a well intervention operation using the EDP/LRP, ITBT, and pressure containing tubulars.

A method of riserless well intervention comprising:

• a) deploying an emergency disconnect package (EDP)/lower riser package (LRP) stack subsea on a subsea tree connected to a well;
• i) wherein the LRP comprises a tree connector, a connector and seal stab adapter (CSSA), and a lower riser package body (LRP body),
• wherein the tree connector comprises an upper flange having a gasket profile for mating to a lower end of the CSSA,
• wherein the CSSA comprises at least one seal stab assembly on its lower end for fluidly connecting to a subsea tree,
• wherein the LRP body comprises one or more LRP sealing elements capable of sealing upon command, and an integral annulus with at least one annulus isolation valve, and
• wherein the LRP body comprises an upper hub profile compatible with a quick disconnect connector and lower flange profile that fluidly mates with the CSSA;
• ii) wherein the EDP removably connects to the LRP, wherein the EDP comprises a body (EDP body) having a quick disconnect connector on its lower end, one or more EDP sealing elements capable of sealing upon command, and at least one annulus isolation valve, and wherein the EDP body has an internal tie-back profile;
• iii) wherein the EDP has an adapter removably attached to the EDP body, and a lubricator removably attached to the adapter;
• and
• b) performing a well intervention operation using the EDP/LRP and lubricator.

A method of well intervention, comprising:

• a) deploying an emergency disconnect package (EDP)/lower riser package (LRP) stack subsea on a subsea tree connected to a well, wherein the EDP/LRP stack is a sub-system of an open water completion workover riser system (CWOR), wherein the CWOR system comprises a tapered stress joint, one or more riser joints, a surface tension joint, surface termination joints, a surface tree and surface tension system, and wherein the CWOR system fluidly connects the surface tree to a body of the EDP (EDP body);
• i) wherein the LRP is comprised of a tree connector, a connector and seal stab adapter (CSSA), and a LRP body,
• wherein the tree connector comprises an upper flange having a gasket profile for mating to a lower end of the CSSA,
• wherein the CSSA comprises at least one seal stab assembly on its lower end for fluidly connecting to the subsea tree,
• wherein the LRP body comprises one or more LRP sealing elements capable of sealing upon command, and an integral annulus with at least one annulus isolation valve, and
• wherein the LRP body comprising an upper hub profile compatible with a quick disconnect connector and lower flange profile that fluidly mates with the CSSA;
• ii) wherein the EDP removably connects to the LRP, and wherein the EDP comprising a body (EDP body) having a quick disconnect connector on its lower end, one or more EDP sealing elements capable of sealing upon command, and at least one annulus isolation valve, the EDP body having an internal tie-back profile;
• and
• b) performing a well intervention operation using the EDP/LRP stack and CWOR system.