2016亚洲OTC 获奖技术 – 威德福Renaissance系统

Safety valve-related problems can result in decreased or shut-in production, which can require expensive workover operations to pull and sometimes replace the tubing.

Renaissance™ systems can restore production in wells with damaged safety valves that have caused shut-in production. Renaissance systems can also increase production in wells experiencing production-suppressing issues―varying from liquid loading in gas wells to wax inhibition and retrofitting gas lift in compromised oil wells―without sacrificing surface or subsurface safety-valve functionality.

Renaissance systems encompass a series of complementary technologies that enhance production rates and increase total recoverable reserves in brownfield assets.

Renaissance safety valve systems optimize performance via a custom solution for each well. Moreover, each valve offers the benefits of simplicity, reliability, safety, cost reduction, and overall extended reservoir recovery.

Minimize risk, reduce costs, and increase production.

Renaissance subsurface safety valves (SSVs) build on the industry-leading Weatherford Optimax SSV by integrating propriety ways of retrofitting systems to deliver treatment fluids downhole without compromising well integrity or safety-valve functionality. Renaissance SSVs are installed as an intervention installation, which is faster and more economical than completing a conventional workover.

Built on our industry-leading safety-valve technology, Renaissance systems integrate propriety methods to inject fluids downhole to enhance production or to retrofit a new SSV control line where the original has failed.

Case study：Restores Oil Production to Original Rate in 3 Wells While Saving $20 Million In Remediation Costs

Objectives

• Restore oil production to the original rate—without using a rig or workover unit—in three wells that could not be produced because the surface-controlled subsurface safety valves (SCSSVs) were leaking.

• Eliminate the requirement to produce the wells through a subsurface-controlled ambient safety valve.

• Avoid adding spool, modifying the current wellhead configuration and flowline height, or significantly restricting flow during the workover.

Approach

• Weatherford recommended using the Renaissance WDCL (Weatherford damaged control line) system to install a new SCSSV in each well. The team deployed the rigless system using slickline and capillary units.

• Weatherford used the REN-GATE™ wellhead-penetration conversion kit to retrofit the wells without removing the wellhead or modifying the current configuration. Using the REN-GATE kit also eliminated the need to add spool.

• The team installed the Weatherford Optimax™ SCSSV using two methods. In Well 1, they used the eclipse-retrievable (ER) packer assembly that included the SCSSV as a hanging device. In Wells 2 and 3, they used a lock mandrel that included the SCSSV as a hanging device.

• By applying hydraulic pressure on the control line from the platform control panel down through the REN-GATE kit, the team held the SCSSV flapper open in each well and avoided flow restrictions.

• Once the newly installed SCSSVs passed field tests, the platform regained control over the wells and they resumed production.

Value to Client

• By using the Renaissance WDCL system to install new SCSSVs, the operator restored oil production to original rates in each well.

• The operator saved US $20 million, along with significant rig time, by avoiding the use of a rig or workover unit.

LOCATION
Malaysia

WELL TYPE
Offshore, deviated, oil

SETTING DEPTHS
Well 1: 1,148 ft (350 m)
Well 2: 479 ft (146 m)
Well 3: 468 ft (143 m)

PRODUCTION RATES
Well 1: 200 B/D (31.8 m3)
Well 2: 400 B/D (63.6 m3)
Well 3: 800 B/D (127.2 m3/d)