The objective of this paper is to show how Well Access Technology is changing from field and project specific equipment packages to be subsea tree-vendor and field independent multipurpose systems developed during early 2000 for open water and landing string systems. Fifteen years of experience from performing Riserless Light Well Intervention (RLWI) on more than 350 different subsea wells has provided the knowledge to develop today's state of the art multifunctional subsea service technology. The experiences and synergies of RLWI operations have enabled continuous development of the technology to meet tomorrow's requirement in subsea services.

This Paper will give insight into the challenges experienced by going from standard methods with hydraulic power supplied from the surface through heavy and expensive, large diameter umbilicals, to stack integrated ecofriendly closed loop subsea electrohydraulic control system. Demonstration will be provided on how experience has enabled interfaces and communications both electrical and hydraulic, with various manufactures' subsea trees, through the use of modular and flexible solutions with services customized for desired operational needs for the short and long term throughout the life of field. Add-on control unit module enabling control of cross vendor systems will also be presented.

Technology, operational experience and standardization have evolved over the years and have resulted in a set of robust system building blocks, which enable multi-functionality. The most recent systems are able to perform a large number of operations on a multi-field basis. From early 2000's, combined Workover Control Systems (WOCS) have been developed. These enable operation between open water systems and landing string systems, as well as for control of multi-fields and multi-vendor systems.

The scope of RLWI service is currently being expanded. An optimization of the second generation RLWI system suitable for deepwater application in the USA GOM will be described featuring the latest generation of fiber optics, electrical and electro hydraulic technology.

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