A system and method for completing a well with multiple zones of production is provided, including a casing having a plurality of valves integrated therein for isolating each well zone, establishing communication between each underlying formation and the interior of the casing, and delivering a treatment fluid to each of the multiple well zones. Furthermore, the present invention further discloses mechanisms for actuating one or more of the valves including, but not limited to, a dart, a drop ball, a running tool, and control line actuating system.

System for completing multiple well intervals

A tubing string assembly is disclosed for fluid treatment of a wellbore. The tubing string can be used for staged wellbore fluid treatment where a selected segment of the wellbore is treated, while other segments are sealed off. The tubing string can also be used where a ported tubing string is required to be run in in a pressure tight condition and later is needed to be in an open-port condition.

Method and apparatus for wellbore fluid treatment

A method for treating multiple intervals in a wellbore by perforating at least one interval (32, 33, or 34) then treating and isolating the perforated interval(s) (32, 33, or 34) without removing the perforating sleeve (101) from the wellbore during the treatment or isolation. The invention can be applied to hydraulic fracturing (222) with or without proppant materials as well as to chemical stimulation treatments.

Method for treating multiple wellbore intervals

Apparatus having a fiber optic tether disposed in coiled tubing for communicating information between downhole tools and sensors and surface equipment and methods of operating such equipment. Wellbore operations performed using the fiber optic enabled coiled tubing apparatus includes transmitting control signals from the surface equipment to the downhole equipment over the fiber optic tether, transmitting information gathered from at least one downhole sensor to the surface equipment over the fiber optic tether, or collecting information by measuring an optical property observed on the fiber optic tether. The downhole tools or sensors connected to the fiber optic tether may either include devices that manipulate or respond to optical signal directly or tools or sensors that operate according to conventional principles.

System and methods using fiber optics in coiled tubing

A dissolvable bridge plug configured with components for maintaining anchoring and structural integrity for high pressure applications. Embodiments of the plug are configured such that these components may substantially dissolve to allow for ease of plug removal following such applications. In one embodiment the plug may effectively provide isolation in a cased well for applications generating over about 8,000 - 10,000 psi. At the same time, by employment of a dissolve period for the noted components, such a plug may be drilled-out in less than about 30 minutes, even where, disposed in a lateral leg of the well.

Dissolvable bridge plug

The invention provides an apparatus and method for perforating and treating multiple intervals of one or more subterranean formations (86) intersected by a wellbore by deploying a bottom-hole assembly having a perforating device (134) and at least one sealing mechanism (120) within said wellbore. The perforating device (134) is used to perforate the first interval to be treated. Then the bottom-hole assembly is positioned within the wellbore such that the sealing mechanism (120), when actuated, establishes a hydraulic seal in the wellbore to positively force fluid to enter the perforations (230, 231) corresponding to the first interval to be treated. A treating fluid is then pumped down the wellbore and into the perforations (230, 231) created in the perforated interval. The sealing mechanism (120) is released, and the steps are then repeated for as many intervals as desired, without removing the bottom hole assembly from said wellbore.

Method and apparatus for stimulation of multiple formation intervals

A perforating gun assembly (10) for use in perforating multiple intervals of at least one subterranean formation intersected by a cased wellbore and in treating the multiple intervals using a diversion agent, such as ball sealers (32). In one embodiment, the apparatus of the present invention comprises a perforating assembly having a plurality ofselect-fire perforating devices (16) interconnected by connector subs, with each of the perforating devices having multiple perforating charges (34). The apparatus also includes at least one decentralizer (22), attached to at least one of the perforating devices, which is adapted to eccentrically position the perforating assembly within the cased wellbore so as to create sufficient ball sealer clearance between the perforating assembly and the inner wall of the cased wellbore to permit passage of at least one ball sealer.

Perforating gun assembly for use in multi-stage stimulation operations

The invention relates to a method for forming a welded joint (11) between abutting pieces of steel (12). The welded joint (11) is produced by first forming a strength weld (16) and then depositing additional weld metal on the toe (22) of the strength weld (16) to form a toughness weld (23, 24). The fusion interface of the toughness weld forms a minimum angle with the direction of maximum tensile load across the welded joint (11). The toughness toe (26) is separated from the heat-affected zone (27) of the strength weld (16) to effectively prevent propagation of a crack initiated at the toughness weld toe (22) into the heat-affected zone (27) of the strength weld (16). The welded joint (11) so produced is substantially resistant to failure by brittle fracture.

Welding process and welded joints

A method and apparatus associated with the production of hydrocarbons. In one embodiment, the method describes connecting multiple wells to a stimulation fluid pumping system via a pumping system manifold. The pumping system manifold is adjusted to provide a first well flow path from the stimulation fluid pumping system to a first well. Then, a first stimulation treatment is pumped into the first well. Concurrently with the pumping of the first stimulation treatment, a second well is prepared for a second stimulation treatment.

Method and apparatus associated with stimulation treatments for wells

A slip assembly apparatus (10) is adapted (i) to be deployed into a wellbore (1) via deployment means (7); (ii) to prevent axial movement of a downhole tool assembly (5) in the wellbore (1) when the slip assembly apparatus (10) is actuated and external forces are imposed on the downhole tool assembly (5); (ii) to allow fluid flow past the slip assembly apparatus (10) within the wellbore (1) when the slip assembly apparatus (10) is actuated or non-actuated; and (iii) to allow release of the slip assembly apparatus (10) by use of a release load that is less than the axial capacity of the deployment means (7).

Apparatus and methods for preventing axial movement of downhole tool assemblies

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