Design method of six-spud-in wellbore structure

Abstract

The invention provides a design method of a six-spud-in wellbore structure, and belongs to the field of engineering boring of resources such as petroleum and natural gas. The design method includes the steps of (1), at the surface level, drilling a depth of 30-50 m by a drill bit with the diameter phi ranging from 604 mm to 614 mm, setting a casing with the diameter phi ranging from 503 mm to 513 mm after removing the drill bit, , and pouring cement paste for well cementation; (2), at the first spud in, drilling a depth of 300 m by a drill bit with the diameter phi ranging from 474 mm to 484 mm, setting a casing with the diameter ranging from 401 mm to 411 mm after removing the drill bit,, and pouring cement paste for well cementation; (3), at the second spud in, drilling a depth about 2000 m by a drill bit with the diameter phi ranging from 337 mm to 347 mm, setting a casing with the diameter phi ranging from 293 mm to 303 mm after removing the drill bit, and then pouring cement paste to realize well cementation.

Description

technical field [0001] The invention belongs to the field of engineering drilling of resources such as oil and natural gas, and in particular relates to a method for designing a hexagonal well body structure. Background technique [0002] Domestic and foreign research on key drilling technologies such as wellbore structure design, drilling speed increase technology, cementing quality, and pressure-bearing plugging are not perfect, and the levels of conventional technologies at home and abroad are similar and generally at the same level status. There are still unsolved problems in improving formation stability and pressure bearing capacity and small gap high-density anti-gas channeling cementing technology. [0003] There are many casings in foreign countries, and the casings used in deep and ultra-deep wells are complete in series and have a wide range of applications. They belong to the conventional series of well casing structures. [0004] The domestic deep well structu...

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Problems solved by technology

[0013] The purpose of the present invention is to solve the problems existing in the above-mentioned prior art, and provide a design method of a six-fold well structure, which cannot be implemented when drilling complex formations during the drilling process for conventional well structure and current drilling technology. The problem of drilling purpose is to solve the problem of safe drilling of different pressure systems in the same open hole section, to solve the contradiction of wanting to add a layer of casing but there is no room for the wellbore structure, to solve the problem that it is difficult to achieve geological goals when drilling in complex formations, and to meet the requirements Exploration and Development Requirements

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