Abstract

The proposed invention relates to oil and gas industry, namely to the devices for carrying out a hydraulic fracturing with following well clean-up and can be used for carrying out the well remedial work for stimulation of a hydrocarbons inflow. Provides a significant saving of time and financial costs for execution of the hydraulic fracturing work package. The borehole configuration comprises a mounting on the tubings (1) from top to bottom a ejector pump (4) with a through channel, a packer (2) and a hole (10) for pumping up the hydraulic fracturing fluid. According to the invention the configuration contains an additional packer mounted on the tubings below the first packer, with the possibility of mounting the packers above and below the intended for the hydraulic fracturing an interval of formation, where the hole for pumping up the hydraulic fracturing fluid is a window made between the packers. The variant of the configuration is proposed where it contains a straddle packer, comprising an upper and lower packer units, mounted on the tubings with the possibility of mounting the packer units above and below the intended for the hydraulic fracturing the formation interval, where the hole for pumping up the hydraulic fracturing fluid is a window made between the packer units.

IPC Classes  ?

• E21B 33/124 - Units with longitudinally-spaced plugs for isolating the intermediate space
• E21B 43/12 - Methods or apparatus for controlling the flow of the obtained fluid to or in wells
• E21B 43/267 - Methods for stimulating production by forming crevices or fractures reinforcing fractures by propping
• F04F 5/02 - Jet pumps, i.e. devices in which fluid flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being liquid

Abstract

The group of inventions relates to the art of well drilling and operation, and more particularly to the design of hydromechanical perforators for perforating producing formations. The result is enhanced perforator performance and reliability. The hydromechanical perforator comprises a housing, a working hydraulic cylinder disposed inside the housing, a working assembly situated below the working hydraulic cylinder and having at least one working tool, and also a mechanism for transmitting force from the hydraulic cylinder to the working assembly. According to the invention, the perforator is provided with an additional hydraulic cylinder and mechanism for transmitting force to the working assembly, which are situated inside the housing below the working assembly in such a way that this lower hydraulic cylinder is able to generate additional force on the working assembly in an upwards direction counter to the force generated by the hydraulic cylinder situated above the working assembly, wherein the force generated by the lower hydraulic cylinder is provided by the action of a fluid on the cylinder, said fluid arriving at the cylinder under pressure, for example via one or a plurality of hydraulic channels in the perforator housing, or via a hydraulic system provided in the perforator, or by other means. Also proposed are variants of the invention which include additional working assemblies, and variants which provide an individual supply of force to each working assembly.

IPC Classes  ?

• E21B 43/112 - Perforators with extendable perforating members, e.g. actuated by fluid means

Abstract

The proposed group of inventions relates to the field of well drilling and well operations, and in particular, to the design of devices for opening of productive formations through hydro- mechanical slot perforations. It ensures uniform simultaneous opening of the production string in at least two projections with a guaranteed formation of slots of equally high quality. The hydro- mechanical slot perforator comprises a casing that houses a piston-pusher and a cutting assembly, located below the piston-pusher, which includes extendable cutting tools and a mechanism for their extending in the form of a double-arm lever (balance beam) whose arms hold the cutting tools; as well as a deflecting wedge mounted under the balance beam, with the balance beam mounted on a mobile shaft to enable its rotation when its lower arm interacts with the deflecting wedge while the piston-pusher moves down. According to the invention, the piston-pusher is designed as a wedge-piston capable of acting on the upper arm of the double- arm lever which extends the top cutting tool out, and thus resulting in the wedge-piston and the deflecting wedge creating oppositely directed forces acting simultaneously on the upper and lower arms of the balance beam. Another version of the invention is proposed where an augmented cutting assembly contains more than two cutting tools.

IPC Classes  ?

• E21B 43/112 - Perforators with extendable perforating members, e.g. actuated by fluid means

Abstract

The group of inventions relates to the field of drilling and well operation and, in particular, to the design of devices for penetrating producing formations by hydromechanical slot perforation. The design in question provides uniform penetration of the production string in at least two projections simultaneously and ensures that the slots formed are of the same high quality. The hydromechanical slot perforator comprises a housing, a piston or plunger disposed in said housing, and a cutting unit situated below the piston, said cutting unit comprising extendable cutting instruments with an extension mechanism in the form of a beam with the cutting instruments disposed on the arms thereof, the beam being mounted in such a way that it is able to rotate about a geometric axis as the piston or plunger moves downwards, and the cutting instruments are able to produce at least two slots simultaneously in the production string. According to the invention, the perforator is equipped with an additional piston disposed in the housing below the cutting unit such that as this lower piston moves upwards, it is able to produce an additional force on the lower beam arm bearing the lower cutting instrument, the upwards movement of the lower piston being provided by the action thereon of a fluid supplied to the lower piston under pressure, for example via one or more hydraulic channels provided in the housing of the perforator, or via a hydraulic system otherwise provided in the perforator. Embodiments of the invention are proposed with different designs of the cutting instrument extension mechanism.

IPC Classes  ?

• E21B 43/112 - Perforators with extendable perforating members, e.g. actuated by fluid means

Abstract

The invention relates to drilling and well operations, in particular to the design of devices for opening of productive layers by means of slot perforation. Accelerates the formation of perforated slots, increasing reliability and security of the perforator, improving its operational performance. Cutting unit of slot-type perforator, performed in the perforator's casing, driven by the pusher, for example, piston or plunger, containing telescoping cutting tools with the mechanism of their extension in the form of holders, one of which is fixed relative to the pusher and the other - is fixed with respect to the perforator's casing, and the holders are performed with possibility of rotating together with extension of the cutting tools from perforator's casing. According to the invention, the cutting tool extension mechanism additionally comprises a balance beam, which has cutting tools mounted in the arms, assembled in the casing between the holders with the possibility of rotation at contact with them, and the geometrical axis of rotation of the beam is adapted to move relative to the longitudinal axis of the casing, such as the groove in the casing. The embodiment of the invention which includes balance beams sequentially mounted between the holders in the amount of two or more pieces. The cutting unit can be equipped with a retractable mechanism to bring telescoping parts into the transport position and fix them in position.

IPC Classes  ?

• E21B 43/112 - Perforators with extendable perforating members, e.g. actuated by fluid means

Abstract

The invention relates to drilling and well operations, in particular to the design of devices for opening of productive layers by means of hydromechanical slot perforation. Accelerates the formation of perforated slots, increasing reliability and security of the perforator, improving its operational performance. Cutting unit of slot-type perforator, performed in the perforator's body, driven by the pusher, for example, piston or plunger, containing telescoping cutting tools with the mechanism of their extension in the form of holders, one of which is fixed relative to the piston or plunger and the other - is fixed with respect to the perforator's body, and the holders are performed with possibility of interaction and movement relative to each other with extension of the cutting tools from perforator's body in opposite directions when moving the piston (plunger). According to the invention, the cutting unit is additionally equipped with optional retractable mechanism to bring parts into the transport position and to fix them in such position, including at least one guide groove made in the holder fixed relation to the casing, and at least one thrust attached to the holder fixed with respect to the piston (plunger) or directly to the piston (plunger), performed with the ability to move through the groove and thereby ensure the return of the holder with the groove in a transport position during the reverse movement of the piston (plunger), and comprising a recess made in a holder fixed with respect to the piston (plunger), in a form close to the shape of the casing's edge, with the possibility of fixation of that holder in the case in the absence of pressure applied to the piston (plunger) by means of clutching of casing's edge with holder's recess.

IPC Classes  ?

• E21B 43/112 - Perforators with extendable perforating members, e.g. actuated by fluid means