In accordance with the present invention, a plurality of methods are provided for solving important and serious problems posed by lateral (and especially multilateral) completion in a wellbore including methods for sealing the junction between a vertical and lateral (70) well. Methods are disclosed for improved juncture sealing including novel techniques for establishing pressure tight seals between a liner (88) in the lateral wellbore (70) and a liner (66) in the vertical wellbore. These methods generally relate to the installation of a liner (88) to a location between the vertical and lateral (70) wellbore such that the vertical wellbore is blocked. Thereafter, at least a portion of the liner (88) is removed to reopen (76) the blocked vertical wellbore.

Method and apparatus for sealing the juncture between a vertical well and one or more horizontal wells

A method for completing multi-lateral wells and maintaining selective re-entry into laterals is presented. In accordance with the present invention, a first lateral well is drilled from a primary well bore and a string of external casing packers and a packer bore receptacle are run therein. Once the orientation of the packer bore receptacle is determined, an orientation anchor of a retrievable whipstock assembly is mounted thereto. Thereafter, a second lateral well may be drilled. Once the second lateral well is drilled, the whipstock assembly may be retrieved and replaced with a scoophead diverter assembly which also includes an orientation anchor for mating with the packer bore receptacle. At this time, a string of external casing packers may be run into the second lateral well through the scoophead diverter assembly. Finally, a selective reentry tool is run into the scoophead assembly. The selective re-entry tool includes a diversion flapper for selecting either the first or second lateral well bore. Selective re-entry is desirable for the purpose of performing well intervention techniques. The re-entry tool may be actuated by a device located on a coil tubing work string which may be operated from the surface.

Method for completing multi-lateral wells and maintaining selective re-entry into laterals

In accordance with the present invention, a plurality of methods and devices are provided for solving important and serious problems posed by lateral (and especially multilateral) completion in a wellbore including methods and devices for isolating a lateral well from other lateral branches in a multilateral well so as to prevent migration of fluids and to comply with regulations regarding the separate production of different production zones. Various methods and devices are provided for fluid isolation of a lateral well from other lateral wells and for separate production from a lateral well without commingling the production fluids. These methods include the use of a side pocket mandrel, whipstocks with sealable bores and valving techniques wherein valves are located at the surface or downhole at the junction of a particular lateral.

Method and apparatus for isolating one horizontal production zone in a multilateral well

A method is presented involving the use of measurement-while-drilling (MWD) devices and tools for well completion (including multi-lateral well completion). While MWD techniques have been known for many years and in that time, have gained wide acceptance, the use of MWD has been limited only to borehole drilling, particularly directional drilling. However, it has now been discovered that MWD may be advantageously used in wellbore completions and particularly multi-lateral completions. Examples of successful applications of MWD in completions are provided with regard to lateral wellbores which may be installed at depths of 10,000 ft. or more, and which range from vertical to horizontal. Such examples include the running of a scoophead/diverter assembly and a parallel seal assembly where it is desirable to align the tools at approximately the position at which they will engage with mating equipment.

Wellbore completion using measurement-while-drilling techniques

A scoophead/diverter (510) is presented which is installed at the junction between a primary (16) wellbore and a lateral branch (72) and which allows the production tubing (298) to be oriented and anchored. This scoophead/diverter (510) further provides dual seal bores (380) tying back to the surface with either a dual packer completion or a single tubing string completion utilizing a selective re-entry tool (460). The scoophead/diverter (510) comprises a scoophead (292), a diverter sub (294), two struts (296, 297) as connecting members between the scoophead (292) and diverter sub (294) and a joint of tubing (298) communicating from the scoophead (292), through the diverter sub (294), and to the primary wellbore (16). The scoophead (292) has a large (302) and a small (300) bore. The large bore (302) is a receptacle for a tie back sleeve (350) run on top of the lateral wellbore string, and the small bore (300) is a seal bore to tie the primary wellbore back to surface. Below the scoophead (292), a joint of tubing (298) is threaded to the small bore (300).

Scoophead/diverter assembly for completing lateral wellbores

New Developments in Short-, Medium-, and Long-Radius Lateral Drilling

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New Developments in Short-, Medium-, and Long-Radius Lateral Drilling