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Construction of a Tubular at a Downhole Location

Inactive Publication Date: 2008-07-10
SCHLUMBERGER TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0030]In a fifteenth preferred embodiment, the reserve of material comprises a plurality of short pipes and the method further comprises jointing the short pipes toge

Problems solved by technology

Since it is not possible to push large pieces of tubular in an extreme sharp curve, right-angle constructing of a cased lateral hole is difficult to achieve.
In case the lateral hole is intended to reach a relatively thin reservoir, it is difficult to control the radius curve so as to position the lateral hole in the relatively thin reservoir.
It is recognized that a combination of lateral hole construction, casing drilling and / or tubular expansion is a major challenge.

Method used

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  • Construction of a Tubular at a Downhole Location
  • Construction of a Tubular at a Downhole Location
  • Construction of a Tubular at a Downhole Location

Examples

Experimental program
Comparison scheme
Effect test

first example embodiment

OF THE INVENTION

[0065]FIG. 3 contains an illustration of a first example embodiment of the present invention. A drilling machine 301 is positioned in a main well 302 using a main cable 304. When the drilling machine 301 is at a proper depth in the main well 302, the drilling machine 301 is oriented in a proper azimuthal position.

[0066]Once the drilling machine 301 is at the proper depth with the proper azimuthal position, the drilling of the lateral hole 303 starts. If the main cable 304 is not rigid enough to keep the azimuthal position during the full operation, it may be needed to clamp the drilling machine 301 in the main well 302.

[0067]The drilling is performed using a drill bit 307 located at an end of a drill string 305a.

[0068]The drilling is performed in a direction of elongation forming a determined angle with the main well 302. In this embodiment, the direction of elongation is substantially perpendicular to a longitudinal direction of the main well 302. Hence the lateral...

second example embodiment

OF THE INVENTION

[0099]FIG. 9 illustrates a second example embodiment of the present invention. A drilling machine 901 is positioned at a determined depth in a main well 902. A lateral hole 903 is drilled using the drilling machine. The lateral hole is cased with a tubular 905 that is constructed from a reserve of material. The reserve of material has a size adapted to be stored within the drilling machine 901. The reserve of material contains at least one storage roll 906. Each storage roll 906 encloses a band of metal 914 following a spiral. The tubular is constructed by wrapping the band of metal 914. The wrapped band of metal 914 is jointed by a jointing device 915 just before leaving the drilling machine 901. The constructed tubular 905 is positioned in the drilled lateral hole 903 and is used as a drill string at an end of which a drill bit 907 drills the lateral hole 903.

[0100]Unlike the example embodiment illustrated in FIG. 3, the storage rolls 906 stay perpendicular to a lo...

third example embodiment

OF THE INVENTION

[0102]FIG. 10 illustrates a third example embodiment of the invention. A lateral hole 1003 departing from a wall of a main well 1002 at a determined depth in a direction substantially perpendicular to a longitudinal direction of the main well 1002 is drilled using a drilling machine 1001. A tubular 1005 is constructed downhole and is positioned in the lateral hole 1003. The tubular 1005 is also used during the drilling. The drilling is performed using a drill bit 1007 located at an end of the positioned tubular 1005.

[0103]The tubular 1005 is constructed by wrapping a band of metal 1014. The band of metal 1014 is stored at a surface location in a storage roll 1006. The band of metal 1014 is unwrapped from the storage roll 1006 at surface. The band of metal 1014 is brought through the main well 1002 to the determined depth following a long shaft 1013.

[0104]A jointing device 1015 located at an intersection of the main well 1002 and the lateral hole 1003 performs a joint...

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Abstract

A method for constructing a lateral hole (303) departing from a main well (302) at a determined depth, the lateral hole (303) having a direction of elongation forming a determined angle with the main well (302), comprises positioning a drilling machine (301) at the determined depth in the main well (302), drilling the lateral hole (303) departing from a wall of the main well (302), in substantially the direction of elongation forming the determined angle with the main well (302), using the drilling machine (301), constructing a tubular (305) for the lateral hole (303) at a downhole location, and positioning the constructed tubular (305) into the lateral hole (303).

Description

BACKGROUND OF INVENTION[0001]1. Field of the Invention[0002]The invention relates generally to a downhole construction process in a borehole.[0003]2. Background Art[0004]Lateral hole drilling is increasingly being used in well constructions. The lateral hole allows to access a zone of a reservoir at a lateral distance from the well, e.g. an hydrocarbon reservoir, or an aquifer. Lateral hole drilling is proven to be useful in the case of high hydrocarbon viscosity, low permeability formation, highly layered reservoir etc.[0005]FIG. 1 illustrates a schematic of a lateral hole 11 departing from a main well 12. The drilling of the lateral hole 11 is often performed with a flexible motor (not represented in FIG. 1).[0006]When drilling the main well 12, a casing 13 is installed in order to isolate geological layers (14, 15) from each other, or to isolate a geological layer 15 from a first reservoir 16 in order to prevent the content of the first reservoir 16 to leak along the well. The ca...

Claims

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Application Information

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IPC IPC(8): E21B7/08B21C37/12E21B7/06E21B7/20E21B41/00
CPCB21C37/122E21B41/0035E21B7/203E21B7/068
Inventor ORBAN, JACQUESMONTARON, BERNARD
Owner SCHLUMBERGER TECH CORP