CA2211883A1 - Apparatus for establishing branch wells from a parent well - Google Patents
Apparatus for establishing branch wells from a parent wellInfo
- Publication number
- CA2211883A1 CA2211883A1 CA 2211883 CA2211883A CA2211883A1 CA 2211883 A1 CA2211883 A1 CA 2211883A1 CA 2211883 CA2211883 CA 2211883 CA 2211883 A CA2211883 A CA 2211883A CA 2211883 A1 CA2211883 A1 CA 2211883A1
- Authority
- CA
- Canada
- Prior art keywords
- branching
- well
- outlet
- sub
- outlet members
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Apparatus Associated With Microorganisms And Enzymes (AREA)
- Earth Drilling (AREA)
Abstract
A method and apparatus for creating multiple branch wells from a parent well is disclosed.
According to a first embodiment of the invention a multiple branching sub is provided for placement at a branching node of a well. Such sub includes a branching chamber and a plurality of branching outlet members. The outlet members, during construction of the branching sub, have previously been distorted into oblong shapes so that all of the branching outlet members fit within an imaginary cylinder which is coaxial with and substantially the same radius as the branching chamber.
According to one embodiment, the distorted outlet members are characterized by an outer convex shape. In another embodiment, the distorted outlet members are characterized by an outer concave shape when in a retracted state. After deployment of the branching sub via a parent casing in the well, a forming tool is lowered to the interior of the sub. The outlet members are extended outwardly by the forming tool and simultaneously formed into substantially round tubes.
Next, each outlet member is plugged with cement, after which each branch well is drilled through a respective outlet member. If desired, each branch may be lined with casing and sealed to a branching outlet by means of a casing hanger. A manifold placed in the branching chamber controls the production of each branch well to the parent well. According to a second embodiment of the invention, a pressure resistant branching sub is provided which may be installed in series with a casing string, and the associated equipment used for the installation operation and intervention of a well. The branching sub includes a main pipe and a lateral outlet.
According to a first embodiment of the invention a multiple branching sub is provided for placement at a branching node of a well. Such sub includes a branching chamber and a plurality of branching outlet members. The outlet members, during construction of the branching sub, have previously been distorted into oblong shapes so that all of the branching outlet members fit within an imaginary cylinder which is coaxial with and substantially the same radius as the branching chamber.
According to one embodiment, the distorted outlet members are characterized by an outer convex shape. In another embodiment, the distorted outlet members are characterized by an outer concave shape when in a retracted state. After deployment of the branching sub via a parent casing in the well, a forming tool is lowered to the interior of the sub. The outlet members are extended outwardly by the forming tool and simultaneously formed into substantially round tubes.
Next, each outlet member is plugged with cement, after which each branch well is drilled through a respective outlet member. If desired, each branch may be lined with casing and sealed to a branching outlet by means of a casing hanger. A manifold placed in the branching chamber controls the production of each branch well to the parent well. According to a second embodiment of the invention, a pressure resistant branching sub is provided which may be installed in series with a casing string, and the associated equipment used for the installation operation and intervention of a well. The branching sub includes a main pipe and a lateral outlet.
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US2278196P | 1996-07-30 | 1996-07-30 | |
| US60/022,781 | 1996-07-30 | ||
| US08/798,591 US5944107A (en) | 1996-03-11 | 1997-02-11 | Method and apparatus for establishing branch wells at a node of a parent well |
| US08/798,591 | 1997-02-11 | ||
| US08/898,700 | 1997-07-24 | ||
| US08/898,700 US6056059A (en) | 1996-03-11 | 1997-07-24 | Apparatus and method for establishing branch wells from a parent well |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2211883A1 true CA2211883A1 (en) | 1998-01-30 |
| CA2211883C CA2211883C (en) | 2004-04-06 |
Family
ID=32475277
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2211883 Expired - Fee Related CA2211883C (en) | 1996-07-30 | 1997-07-29 | Apparatus for establishing branch wells from a parent well |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2211883C (en) |
-
1997
- 1997-07-29 CA CA 2211883 patent/CA2211883C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CA2211883C (en) | 2004-04-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |