Window assembly for multiple wellbore completions

A window assembly for communicating well tools between a first wellbore and a second wellbore which intersects the first wellbore at a first angle at a downhole location in a multilateral well completion, the window assembly comprising:

• a housing having a first end and a second end with a longitudinal bore extending therethrough;
• mechanical connections formed at the first end and the second end of the housing to secure the window assembly within a tubing string at the downhole location in the first wellbore adjacent to the second wellbore;
• the housing having an exterior surface and an interior surface;
• an elongated slot formed in and extending through the exterior surface and the interior surface of the housing;
• the slot having a length and a width selected to allow communication of well tools between the longitudinal bore and the second wellbore;
• the slot having a first end and a second end with a pair of sides extending generally parallel with each other between the first end and the second end;
• each side of the slot having multiple surfaces formed as an integral part thereof;
• the first end of the slot defined in part by a first radius formed in the exterior surface of the housing and a second radius formed on the interior surface of the housing with the first radius longitudinally offset from the second radius to form a well tool re-entry surface extending at a second angle relative to the longitudinal bore of the housing;
• each side of the slot having a first surface disposed immediately adjacent to the first end with the first surfaces of the slot extending generally parallel with each other and with the longitudinal bore;
• each side of the slot having a second surface formed immediately adjacent to the respective first surface and extending at a third angle relative to the respective first surface and the longitudinal bore whereby the second surface cooperates with the first surface to direct well tools form the second wellbore into the longitudinal bore of the housing through the first end of the slot;
• and
• each side of the slot having a third surface disposed immediately adjacent to the respective second surface with the third surface extending toward the second end of the slot at a fourth angle corresponding approximately with the first angle at which the second wellbore intersects the first wellbore.

A window assembly for communicating well tools between a first wellbore and a second wellbore which intersects the first wellbore at a first angle at a downhole location, the window assembly comprising:

• a housing having a first end and a second end with a longitudinal bore extending therethrough;
• mechanical connections formed at the first end and the second end of the housing to secure the window assembly within a tubing string at the downhole location in the first wellbore adjacent to the second wellbore;
• the housing having an exterior surface and an interior surface with an elongated slot formed in and extending through the exterior surface and the interior surface of the housing;
• the slot having a length and a width selected to allow communication of well tools between the longitudinal bore and the second wellbore;
• the slot having a first end and a second end with a pair of sides extending generally parallel with each other between the first end and the second end;
• each side of the slot having multiple surfaces formed as an integral part thereof;
• the first end of the slot defined in part by a first radius formed in the exterior surface of the housing and a second radius formed on the interior surface of the housing with the first radius longitudinally offset from the second radius to form a well tool re-entry surface extending at a second angle relative to the longitudinal bore of the housing;
• each side of the slot having a first surface disposed immediately adjacent to the first end with the first surfaces of the slot extending generally parallel with each other and with the longitudinal bore;
• and
• each side of the slot having a second surface formed immediately adjacent to the respective first surface and extending at a third angle relative to the respective first surface and the longitudinal bore whereby the second surface cooperates with the first surface to direct well tools from the second wellbore into the longitudinal bore of the housing through the first end of the slot.