摘要:
A system includes a string that comprising a passageway and a plurality of tools. The system further includes an untethered object that is adapted to be deployed in the passageway such that the object travels downhole via the passageway and controllably expand its size as the object travels downhole to selectively cause one of the tools to capture the object.
摘要:
A system for use in a wellbore having a plurality of well zones includes a tubing disposed in the wellbore; and a plurality of valves connected to the tubing, wherein each of the plurality of valves comprises at least one port for communication between the tubing and one of the plurality of well zones, wherein each of the plurality of valves further comprises a sleeve moveable by an actuating device between an open position, wherein the at least one port is open, and a closed position, wherein the at least one port is closed, wherein the actuating device comprises a head part and a tail part, the head part having a disk-like or partial spherical structure having a diameter slightly smaller than an internal diameter of the tubing and the tail part having at least one fin arranged substantially perpendicular to the disk-like or partial spherical structure.
摘要:
A technique is provided to facilitate perforation operations in a well. A well treatment operation is combined with a perforating operation to increase the efficiency of well preparation. A dart assembly has a dart for moving a well treatment fluid downhole and a perforating gun coupled to the dart. As the dart moves the well treatment fluid to a desired region of the well, the perforating gun is simultaneously moved to a desired location for perforation of the well.
摘要:
A technique is provided for moving a downhole equipment assembly into engagement or out of engagement with a lower completion positioned in a wellbore. An upper communication line extends past the downhole equipment assembly, and a lower communication line is located with the lower completion. During engagement, the downhole equipment assembly is connected with the lower completion and the communication lines are coupled via a wet mate system.
摘要:
Methods and tools are described to reduce sanding including the steps of fracturing the cement sheath in a localized zone around the casing and having the fractured zone act as sand filter between the formation and openings in the casing, with the openings being best pre-formed but temporarily blocked so as to allow a conventional primary cementing of the casing. The fracturing step can also be used for remedial operation to reopen blocked formation or screens.
摘要:
A perforating gun includes a base strip having an angular cross section, the base strip being a single unitary structure and essentially comprising at least two longitudinally disposed surfaces, a first surface and a second surface, a first plurality of capsule charges being connected to the first surface and a second plurality of capsule charges being connected to the second surface and interleaved with the first plurality of capsule charges, thereby phasing the capsule charges in the perforating gun. Since the gun utilizes capsule charges, good penetration into the formation is achieved. Due to the cross sectional configuration of the base strip, the phased capsule charges, when mounted on the strip, will easily fit within a tubing string previously used by non-phased capsule charge perforating guns. Since the base strip is a single, unitary structure, it is rugged enough to avoid shattering upon impact with an obstruction in a borehole, yet, due to its chemical and mechanical properties, will shatter in response to detonation of the capsule charges.
摘要:
An explosive pellet for characterizing a fracture in a subterranean formation is provided. The pellet can include a casing having a detonation material and an explosive material disposed within the casing. The pellet can also include a nonexplosive material moveably disposed within the casing. Movement of the nonexplosive material can generate a predetermined amount of energy in the form of friction-generated heat sufficient to detonate the explosive material.
摘要:
A technique provides for stimulating or otherwise treating multiple intervals/zones of a well by controlling flow of treatment fluid via a plurality of flow control devices. The flow control devices are provided with internal profiles and flow through passages. Hydraulic darts are designed for selective engagement with the internal profiles of specific flow control devices, and each hydraulic dart may be moved downhole for engagement with and activation of a specific flow control device.
摘要:
Systems and methods for fracturing multiple zones in a wellbore are provided. Cement can be pumped through a work string into a first annulus formed between a liner and a wall of the wellbore. One or more first contact valves in the liner can be opened with the work string. Fluid can flow through the work string and the one or more first contact valves to fracture a first zone. One or more second contact valves in the liner can be opened with the work string. Fluid can flow through the work string and the one or more second contact valves to fracture a second zone.
摘要:
A technique facilitates actuation of a downhole tool in a well string. The downhole tool may be actuated hydraulically via the controlled flow of a hydraulic fluid under pressure to the downhole tool through a port. Flow of the pressurized fluid through the port is controlled by a barrier member which may be opened by a plunger working in cooperation with the barrier member. Movement of the plunger is controlled by selectively increasing the pressure acting on the plunger through, for example, actuation of an expansion device or other suitable device.