Abstract: A well has a vertical casing with a window, and a lateral wellbore which communicates with the window, and which may have a casing or liner. A window assembly aligned with the window has respective passageways for first and second tubing strings, and has a concave surface for deflecting the first tubing string out into the lateral wellbore. The passageway for the second tubing string has a portion which is inclined at a very small angle with respect to a vertical centerline of the vertical casing. As the first tubing string is run into the vertical casing, a rotational locator is releasably coupled thereto by a soft release coupling mechanism. After the locator effects rotational orientation, the coupling mechanism is released and then permits the first tubing string to move therepast without damage. A seal assembly on the first tubing string is covered by a protective sleeve as it is inserted into the well, and exits the protective sleeve after entering the lateral wellbore.

Abstract: A well has a vertical casing with a window, and a lateral wellbore which communicates with the window, and which may have a casing or liner. A window assembly aligned with the window has respective passageways for first and second tubing strings, and has a concave surface for deflecting the first tubing string out into the lateral wellbore. The passageway for the second tubing string has a portion which is inclined at a very small angle with respect to a vertical centerline of the vertical casing. As the first tubing string is run into the vertical casing, a rotational locator is releasably coupled thereto by a soft release coupling mechanism. After the locator effects rotational orientation, the coupling mechanism is released and then permits the first tubing string to move therepast without damage. A seal assembly on the first tubing string is covered by a protective sleeve as it is inserted into the well, and exits the protective sleeve after entering the lateral wellbore.

Abstract: A self-locating reentry system is provided to allow reliable reentry from a primary wellbore into one or more secondary wellbores. The reentry system may include one or more self-locating assemblies which may be engaged with selected portions of a lateral opening disposed between the primary wellbore and a respective secondary wellbore. Each self-locating assembly and respective key or lug cooperate with each other to provide optimum location and alignment relative to the lateral opening for communication of well tools and smaller diameter tubing strings between the primary wellbore and the associated secondary wellbore. A retaining mechanism is preferably provided to maintain the locator lug or key in its first retracted position until the reentry system is at a desired downhole location relative to the selected lateral opening.

Abstract: A parallel flow tube assembly for producing or treating formations in a well bore wherein the formations are isolated by upper and lower spaced packers. The parallel flow tube assembly includes a coupling member having parallel bores therein. A seal sleeve extends downwardly therefrom for sealingly engaging the interior of the upper packer. A tube extends downwardly through and in sealing engagement with the lower packer and said coupling member is connected to a primary tubing string that is in fluid communication with the formation below the lower packer and a secondary tubing string that is connected in communication with the formation located between the packers.

Abstract: An apparatus for chemical treatment of a fluid pumped from a well through a production tubing includes a tubing anchor with slips adapted to be set hydraulically and mechanically against the casing in the well without rotating the production tubing. A branch line from a chemical injection line communicates with a setting pressure chamber in the anchor which, when pressurized, is used to initially set the slips. Thereafter, a straight pull on the tubing mechanically completes setting of the slips and a plug blocking the injection line is removed enabling the delivery of a treatment chemical to the well fluid upstream of a pump utilized in removing the fluid in the well.

Abstract: A well perforating and completion apparatus includes a packer connectable to the lower end of a tubing string, a vent assembly connected below the packer for communication between the tubing string and the annulus, a well perforating gun assembly having a hydraulically actuatable detonator and a hydraulic actuating fluid flow path between the detonator and the earth surface. A releasable coupling is provided between the packer and the vent assembly to permit disconnecting and dropping of the vent assembly and perforating gun assembly from the tubing string after the perforation has been accomplished to leave an open ended tubing string in the well. The well perforation and completion method of this invention includes assemblying the tool string on the tubing string then running it into the well and positioned with the perforating gun and the packer at the desired location.