摘要:
Multilateral wells and improved multilateral well structures are made by setting a diverter (332) at a prescribed position and a prescribed orientation in a main well flow conductor (120) located within a main wellbore (110), boring through a sidewall of the main well flow conductor (120) and into a material (112) surrounding the main well flow conductor (120), the boring creating a window (324) having a particular shape in the sidewall, the orientation of the diverter (332) determining a lateral position of the window in the main well flow conductor (120), a lateral wellbore (150) thereby being formed in the material and extending from the main wellbore (110), and lining the lateral wellbore (150) with a liner (340), the liner having an interface end (342), the interface end being adapted to contact a periphery of the window (342) in the sidewall, and cementing the liner (340) in place within the lateral wellbore (150). The step of cementing creates a pressure-bearing seal between the periphery of the window and the interface end (342) of the liner (340). The method allows multiple lateral wellbores to be joined to the main wellbore and provides for connectivity among main and lateral wellbores, pressure-bearing sealing of joints to allow selective isolation of one or more wellbores or portions thereof and subsequent wellbore access for rework or other purposes.
摘要:
A tubular anchor assembly (22) coaxially and releasably securable in a subterranean well bore casing, comprising: a tubular inner mandrel (88); a tubular slip carrier (98,132) coaxially circumscribing the inner mandrel in a radially outwardly spaced relationship therewith, the slip carrier having a circumferentially spaced series of side wall slip windows (100, 102, 136, 138) therein and outwardly bounding an annular space between the inner mandrel and the slip carrier; a circumferentially spaced series of slips (40,42) carried in the annular space for radial movement through the slip windows between retracted and extended positions; and a circumferentially spaced series of arcuate, elongated spring members (108) disposed in the annular space and resiliently biasing the slips toward their retracted positions, the spring members being interdigitated with the slips and having longitudinally central portions secured to the slip carrier, with each slip being engaged by end portions of two spring members on circumferentially opposite sides thereof.
摘要:
Multilateral wells and improved multilateral well structures are made by setting a diverter (332) at a prescribed position and a prescribed orientation in a main well flow conductor (120) located within a main wellbore (110), boring through a sidewall of the main well flow conductor (120) and into a material (112) surrounding the main well flow conductor (120), the boring creating a window (324) having a particular shape in the sidewall, the orientation of the diverter (332) determining a lateral position of the window in the main well flow conductor (120), a lateral wellbore (150) thereby being formed in the material and extending from the main wellbore (110), and lining the lateral wellbore (150) with a liner (340), the liner having an interface end (342), the interface end being adapted to contact a periphery of the window (342) in the sidewall, and cementing the liner (340) in place within the lateral wellbore (150). The step of cementing creates a pressure-bearing seal between the periphery of the window and the interface end (342) of the liner (340). The method allows multiple lateral wellbores to be joined to the main wellbore and provides for connectivity among main and lateral wellbores, pressure-bearing sealing of joints to allow selective isolation of one or more wellbores or portions thereof and subsequent wellbore access for rework or other purposes.
摘要:
Multilateral wells and improved multilateral well structures are made by setting a diverter (332) at a prescribed position and a prescribed orientation in a main well flow conductor (120) located within a main wellbore (110), boring through a sidewall of the main well flow conductor (120) and into a material (112) surrounding the main well flow conductor (120), the boring creating a window (324) having a particular shape in the sidewall, the orientation of the diverter (332) determining a lateral position of the window in the main well flow conductor (120), a lateral wellbore (150) thereby being formed in the material and extending from the main wellbore (110), and lining the lateral wellbore (150) with a liner (340), the liner having an interface end (342), the interface end being adapted to contact a periphery of the window (342) in the sidewall, and cementing the liner (340) in place within the lateral wellbore (150). The step of cementing creates a pressure-bearing seal between the periphery of the window and the interface end (342) of the liner (340). The method allows multiple lateral wellbores to be joined to the main wellbore and provides for connectivity among main and lateral wellbores, pressure-bearing sealing of joints to allow selective isolation of one or more wellbores or portions thereof and subsequent wellbore access for rework or other purposes.
摘要:
A retrievable whipstock is connected to a packer below the whipstock. The whipstock comprises an upper housing (32) attached to the deflecting portion (30) and a lower housing (34) attached to the packer. Housings (32,34) are prevented from rotating with respect to each other by engagement of profiles (40,42), with profile (40) comprising circumferentially spaced recesses in upper housing (32) and profile (34) comprising upwardly extending projections formed on lower housing (34). This engagement profiles allow the whipstock to resist torque that is imparted to the whipstock when deflecting a milling tool, so that misalignment of the whipstock relative to well is prevented.
摘要:
Subterranean well bore casing milling apparatus comprising: a tubular anchor assembly (22) having a top end portion and being coaxially and releasably securable in the casing, said tubular anchor assembly including a tubular inner mandrel having an outer side surface, a tubular slip carrier coaxially circumscribing the inner mandrel in a radially outwardly spaced relationship therewith, the slip carrier having a circumferentially spaced series of side wall slip windows therein and outwardly bounding an annular space between the inner mandrel and the slip carrier, a circumferentially spaced series of slips (40, 42) disposed in the annular space, with radially outer portions ofthe slips being received in the slip windows for movement therethrough between radially retracted and radially extended positions, a biasing structure operative to resiliently bias the slips to their radially retracted positions, and a setting structure operative to force the slips from their radially retracted positions to their radially extended positions; a mill guide member (24) having a lower end portion connected to the top end portion of the tubular anchor assembly, and a tubular upper end portion (24a); and a tubular retrieval member coaxially securable to a milling pipe (30) and being coaxially latchable in the tubular member coaxially secured to the upper mill guide member end portion.