Ultra deepwater discoveries are playing a crucial role in replacing global reserves. The world’s operating companies are now confronted with new challenges to ensure the reserves are discovered, appraised and developed safely and efficiently. Subsea landing strings are critical in delivering safe, compliant and efficient operations in all subsea applications (0-15,000ft water depth).
Deployed more than 1500 completions；more than 2000 exploration operations to date; for more than 50 clients. Expro landing string assembly(ELSA) and subsea control systems (EXPRESS) are specifically designed to minimize risk in subsea completion, intervention, exploration and appraisal operations and achieve secure well status in the event of an emergency.
Expro delivers efficient and reliable subsea solutions around the globe, from in-riser to open water and shallow and deep water applications, meeting our customers’ project specific requirements and the latest industry standards. Our systems are designed to tackle high-debris, higher-pressure and temperature in water depths deeper than ever before, maintaining technical integrity and reliability at all times.
Exploration and Appraisal
Landing string assemblies and deepwater well control systems
The basis of all Expro landing string assemblies originates with the systems developed for the exploration and appraisal (E&A) applications more than 25 years ago. Providing equipment for standard 3”, large bore up to 5”, high pressure, deepwater drill stem testing (DST) and even electrical submersible pump (ESP) exploration and appraisal activity, these systems can cover any of our clients’ needs.
DST strings are in riser systems used to allow well operations to be conducted safely during a DST from a semi-submersible rig or drill ship in water depths up to 10,000 ft. They provide the ability to rapidly shut-in the well and disconnect should conditions require it.
The subsea test tree (SSTT) provides the primary dual safety barrier to contain well pressure via two ball valves. In addition, it provides a safe disconnect facility from the well in case of emergency. These valves can be configured to cut coil tubing and wireline while maintaining sealing integrity. The ball closure logic allows a single ball to cut the coil tubing and wireline leaving full redundancy for the other ball to seal. The tree ball valves support pressure applied from above allowing the string and latch seals to be pressure tested. The latch mechanism allows the string to be unlatched and relatched as conditions require. The short overall length of the test tree enables two sets of blowout preventor (BOP) rams to be closed below the test tree and the shear rams to be closed above the tree.
A secondary disconnect system allows well isolation even in the event of total umbilical loss.
The lubricator valve is located below the rig floor providing an increased lubricator section to allow the safe deployment of either wireline or coil tubing equipment. This ball valve features bi-directional sealing to allow pressure testing from above and well pressure control from below. Inherent within the valve is a unique pump through feature enabling well kill operations to be performed.
The retainer valve is located just above the BOP shear rams and is designed, in the event of a disconnect, to isolate the landing string contents and vent trapped pressure from between the retainer valve and the SSTT to the marine riser. It is operated by the latch control line and controlled by a series of mechanical and hydraulic interlocks. As the landing string is bled, the retainer valve allows riser fluid to enter, displacing hydrocarbons from within the string. Fail-as-is or fail-close options are available depending on the operating philosophy.
Features:
■ Cutting capability
■ Independent ball closure
■ Redundancy
■ Downhole functionality
■ Small operating volumes
Benefits:
■ Guarantees well isolation
■ Ability to kill well
■ Allowing one ball to cut coiled tubing or wire and other ball to seal
■ Rapid response well isolation and unlatch
■ Secondary unlatching system
■ Option to allow permanent monitoring cable, SSSV control line or chemical injection line to pass across disconnect point of subsea test tree
Completion and intervention
Horizontal tree solutions
ELSA HD (High debris, deep water)
Elsa HD was specifically developed to operate in applications with highly aggressive erosive solids and deep water environments, offering exceptional reliability for all horizontal/vertical subsea xmas tree well completion and intervention operations. The ELSA HD comprises a full suite of valve assemblies. The lubricator valve, retainer valve and subsea test tree provides a full range of well intervention, pressure control functions and disconnection capabilities for harsh completion installation, workover or intervention operations.
ELSA DH (Direct hydraulic)
These landing string assembles are designed for direct hydraulic completion and intervention applications and interface with all mono-bore completions when used in conjunction with horizontal and conventional subsea production trees. The design incorporates control ports enabling tubing hangar running tool and other downhole functions such as subsurface safety valve (SCSSV) and chemical injection sleeves to be control monitored. In addition electric cabling can be run through the system to monitor downhole gauges or electric submersible pumps.
ELSA HP (High pressure)
The ELSA HP has been developed to service the high pressure horizontal tree completion and intervention market. With systems designed and qualified up to 15,000 psi, 250 degF and 10,000 ft water depth, this landing string assembly provides our clients the safety and reliability required to develop fields with these challenging conditions. Expro used the highly successful and field proven ELSA HD design as the basis for the development of the ELSA HP products.
ELSA LBEH (Large bore)
These landing string assembles are designed for electro hydraulic completion and intervention applications and interface with all mono-bore completions when used in conjunction with horizontal and conventional subsea production trees. The design incorporates control ports enabling tubing hangar running tool and other downhole functions such as subsurface safety valve (SCSSV) and chemical injection sleeves to be controlled monitored. In addition electric cabling can be run through the system to monitor downhole gauges or electric submersible pumps.
ELSA CLV (Cutting lubricator valves)
Cutting lubricator valves are used when coiled tubing and / or wireline cutting capability is required in addition to the more traditional requirements for Expro’s lubricator valves. This includes facilitating the introduction of through tubing tools (i.e. coiled tubing and wireline) into production strings longer than those acceptable in a customary derrick installed lubricator assembly and to provide a means of pressure testing the surface equipment and lubricator sections once the wireline tool string has been installed. ELSA CLV provides a method of isolating surface equipment from production flow and a pressure tight barrier between the well bore and BOP stack and/or marine riser.
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