Wells – Processes – Parallel string or multiple completion well
Patent
1998-04-07
2000-04-11
Bagnell, David
Wells
Processes
Parallel string or multiple completion well
166 50, 1661175, E21B 706
Patent
active
060477741
DESCRIPTION:
BRIEF SUMMARY
This invention relates to downhole oil well tools, and particularly to a multilateral tool used for reducing the time required for drilling and completing multiple wells that extend laterally from a main wellbore. More specifically, this invention relates to a method for assembling well parts to simplify completion of multiple wells extending laterally or vertically into the same or different producing formations from a common wellbore, with full pressure integrity between wells.
BACKGROUND OF THE INVENTION
Multilateral well drilling and production, where separately spaced apart wells extend laterally from a common wellbore, have become increasingly important to the oil industry in recent years, both from the standpoint of new drilling operations, and from the standpoint of reworking existing wellbores. A multilateral well completion frequently improves production to a point that offsets the increased drilling and completion costs. This increased production from multilateral wells, where the lateral wells can be inclined or even horizontal, minimizes the number of production trees required on shore, and likewise minimizes the number of offshore platforms required to maintain a desired production rate. Further, other equipment costs such as casing, tubing, wellheads, bits, muds and other drilling items are reduced. Multilateral drilling also makes petroleum reservoirs in urban areas, permafrost zones, deep offshore waters and faulted reservoirs more accessible for economic recovery. Accordingly, the preferred drilling technique of the future, especially in the oil industry, is multilateral drilling.
However, if the oil industry is to continue to grow, cost reductions are necessary especially in the drilling and completing of multilateral wells. For example, the need to reduce the size and number of offshore platforms while simultaneously developing smaller and often discontinuous reservoirs, which can readily be accomplished with multilateral completions, is an important concern for the oil industry. Accordingly, an urgent need exists for new and improved methods and tools that reduce drilling and completion time required for multilateral wells.
Accordingly, it is an object of this invention to reduce the number and cost of wells required to economically develop oil and/or gas fields.
It is a more specific object of this invention to improve techniques and tools for drilling and completing multilateral wells which can produce oil from separate formation through a single vertical wellbore.
Another object is to drill and complete multilateral wells having full pressure integrity at lateral junctions.
Still, another object is to safely complete several separate reservoirs having different formation pressures from the same well.
Another specific object is to safely complete multiple high pressure reservoirs with a multilateral well.
Yet another object of this invention is to accelerate production and cash flow by reducing drilling and completion time.
Still, another object is to achieve simultaneous production and injection in the same reservoir in a single well.
SUMMARY OF THE INVENTION
According to the present invention, the foregoing and other objects and advantages are attained by running one or more multilateral tools in a casing string, where the multilateral tool serves to speed up drilling and completion operations for multilateral wells. This multilateral tool is a preassembled combination of well casings and accessories that can be run into a wellbore at any suitable depth on a single primary casing string, and the well casings of the tool used to expand the primary casing to provide dual casing strings extending from the single primary casing string. The multilateral tool, which includes three casing sections, is attachable to the primary casing and erects casing sections arranged in the following structural order: a main casing section at the lower end, and a carrier casing section coaxially containing a lateral casing section at the upper end of the multilateral tool. The carrier casing secti
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patent: 5462120 (1995-10-01), Gondouin
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patent: 5944107 (1999-08-01), Ohmer
Bagnell David
Bogatie George E.
Phillips Petroleum Company
Walker Zakiya
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