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• W2046315077 abstract "Summary In 1987, an extensive wireline program was completed on two subsea wells in the Highlander field in the central North Sea with a subsea lubricator deployed from a drilling rig that was drilling and working over adjacent wells. Working on two wells concurrently is a way to reduce the operating costs of a subsea development significantly. Introduction An extensive wireline work program had been planned for Summer 1987 on the Highlander field. This field, located in Block 14120 in the central North Sea, consists of a subsea production template tied back to the Tartan platform located 8 miles away (Fig. 1). Undertaking wireline work on subsea wells is costly because it usually requires the use of a semisubmersible drilling rig and completion riser. The completion riser is latched onto the top of the subsea tree and connects the well to a surface tree located in the rig's derrick. This setup allows the use of conventional wireline equipment and a surface lubricator to enter the well. The need to find a more cost-effective way of wirelining in subsea wells led to the development of alternative approaches. One of the alternatives is subsea wireline, which uses a subsea lubricator system. This system allows a well to be entered with a lubricator mounted directly on top of the subsea tree. The wireline passes from the subsea lubricator through the open water to a winch passes from the subsea lubricator through the open water to a winch mounted on the surface. The subsea lubricator system can be deployed from a diving support vessel (DSV), which results in cost savings because DSV's historically are significantly cheaper to operate than semisubmersible drilling rigs. But because of the depressed rig rates prevailing in 1987, a subsea lubricator deployed from a DSV for the prevailing in 1987, a subsea lubricator deployed from a DSV for the Highlander field wireline program would have been more expensive than conventional wireline equipment from a drilling rig. As a result, we developed an alternative approach for subsea wireline operations that allowed the new subsea wireline technology to be used cost-effectively. It consisted of using a semisubmersible drilling rig to work on two wells concurrently. Simultaneous operations on two wells was achieved by the use of a subsea lubricator deployed through a second moonpool cut in the deck of the rig. Thus, while one well was being worked on with a conventional drilling or completion riser, an adjacent well was being worked on with subsea wireline (Fig. 2). In Sept./Oct. 1987, the subsea lubricator system was mobilized onto the semisubmersible drilling rig Benvrackie, and an extensive wireline program was undertaken while the rig was engaged in drilling or working over adjacent wells. In addition to wireline work being undertaken from the rig, the diving team, on board the rig to support the subsea operation, were inspecting and doing maintenance work on the template. Consequently, three operations were going on at the same time, allowing the cost of the rig and support services to be spread between several jobs. Significant cost savings resulted. Highlander Field The Highlander field is situated in 420 ft of water and consists of a 12-slot subsea template tied back to the Tartan platform. The field came on stream in 1985, when existing appraisal wells were completed and connected to the platform through two 8-in. pipelines. The template was installed adjacent to these satellite wells, which were then hooked up to the template. Three production wellsWells HS12, HS13, and HS14-and one water-injection wellWell HS15-make up the satellite wells. The first well on the template, Well H1, was drilled and completed in Summer 1987 (Fig. 3)." @default.
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• W2046315077 date "1990-08-01" @default.
• W2046315077 modified "2023-09-27" @default.
• W2046315077 title "Simultaneous Wireline Operations From a Floating Rig With a Subsea Lubricator" @default.
• W2046315077 doi "https://doi.org/10.2118/18239-pa" @default.
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