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Portable Toolkit to Expand Light Well Intervention (LWI) Vessel Capabilities2014-05-27

IP.com Disclosure Number: IPCOM000237477D
Publication Date: 2014-Jun-18
Document File: 6 page(s) / 238K

Publishing Venue

The IP.com Prior Art Database

Abstract

Light well intervention (LWI) vessels are used to perform specific tasks in the area of well work, typically including well surveillance operations, well integrity operations, and well production enhancement operations. Several new technologies are proposed for use by LWI vessels to extend the vessel’s capabilities beyond typical LWI activities, and would encompass front-end and back-end well life-cycle activities. The LWI vessel capabilities would be extended to installing well conductors, performing riserless drilling, performing top-hole well construction, and performing complete well plug & abandonments (P&As). The technologies would be included in a portable toolkit and would be designed to be used on LWI vessels to replace large MODUs in the initial stages of drilling operations in order to reduce initial well costs, as well as during late-life P&A activities.

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Abstract

Light well intervention (LWI) vessels are used to perform specific tasks in the area of well work, typically including well surveillance operations, well integrity operations, and well production enhancement operations. Several new technologies are proposed for use by LWI vessels to extend the vessel’s capabilities beyond typical LWI activities, and would encompass front-end and back-end well life-cycle activities. The LWI vessel capabilities would be extended to installing well conductors, performing riserless drilling, performing top-hole well construction, and performing complete well plug & abandonments (P&As). The technologies would be included in a portable toolkit and would be designed to be used on LWI vessels to replace large MODUs in the initial stages of drilling operations in order to reduce initial well costs, as well as during late-life P&A activities.


Background

Light well intervention (LWI) vessels are used to perform specific tasks in the area of well work.  The well work performed by this class of vessel typically includes well surveillance (collect well data, wireline logging, visual or x-ray camera runs, and caliper and other measurement tool operations), well integrity operations (inspect and repair wells, trees, and completions, well kill operations, scale squeeze, and other pumping operations), and well production enhancement (zone isolations, re-perforating, and sand removal).  One of the greatest advantages of using LWI vessels to perform the activities listed above vs. a mobile offshore drilling unit (MODU) is much lower operating costs, potentially $600k less per day.  A schematic of a typical LWI vessel is located below.

 


Novel Idea

The proposed technology is a portable tool-kit that could be deployed on a number of LWI vessels that would extend the vessel’s capabilities beyond typical LWI activities, and would encompass front-end and back-end well life-cycle activities.  The LWI vessel capabilities would be extended to installing well conductors, performing riserless drilling, performing top-hole well construction, and performing complete well plug & abandonments (P&As).  The portable toolkit would be designed to be used on LWI vessels to replace large MODUs in the initial stages of drilling operations in order to reduce initial well costs, as well as late-life P&A activities.  The sections below describe the various areas of LWI vessel work that could be enhanced by this portable toolkit.

The first proposed portable toolkit capability is to enable the LWI vessel to install the low pressure (LP) wellhead (WH) housing and conductor.  The LP wellhead housing and conductor may be jetted, driven, or installed by other alternative method.  The conductor may be handled as a pre-assembled length or as individual joints connected on the LWI vessel.  The tools required to make any connections on the deck, as well as install the conductor may also be handled by a LWI vessel.  The jetting or driving too...