There are proposed a method for selective processing of a productive formation and a device for implementation thereof coupled with a tubing. The device is lowered to the formation’s lowest interval and fixed therein. Working fluid is supplied into the device’s hydraulic fracturing port, the interval is isolated with sealing elements, and hydraulic fracturing is executed. An annular gap is flushed with flush fluid, the lower packer is activated and debris is washed out of the gap through a hydraulic fracturing port. The device is turned to the transport position. The tubing is moved shifting the device’s hollow rod and flushing holes are opened. Flush fluid is then fed into the tubing, the sealing elements are activated and debris is washed out of the gap’s lower area pushing the mixture along the device’s inner cavity into the well. Then the device is moved to the next interval for further processing.

A downhole tool includes a housing defining an axial bore. The downhole tool also includes a piston positioned at least partially within the housing. The piston is configured to actuate from a first piston position into a second piston position at least partially in response to a pressure differential. The downhole tool also includes a locking mechanism positioned at least partially within the housing. The locking mechanism is configured to actuate from a first locking mechanism position into a second locking mechanism position at least partially in response to the pressure differential while the piston is in the second piston position. The downhole tool also includes a disk positioned at least partially within the housing. The disk prevents fluid flow through the axial bore. The disk is configured to break at least partially in response to the pressure differential while the locking mechanism is in the second locking mechanism position.

A downhole tool includes a housing defining an axial bore. The downhole tool also includes a piston positioned at least partially within the housing. The piston is configured to actuate from a first piston position into a second piston position at least partially in response to a pressure differential. The downhole tool also includes a locking mechanism positioned at least partially within the housing. The locking mechanism is configured to actuate from a first locking mechanism position into a second locking mechanism position at least partially in response to the pressure differential while the piston is in the second piston position. The downhole tool also includes a disk positioned at least partially within the housing. The disk prevents fluid flow through the axial bore. The disk is configured to break at least partially in response to the pressure differential while the locking mechanism is in the second locking mechanism position.

Systems of the present disclosure relate to metal-to-metal seals for oilfield tubulars. A pin for a metal-to-metal seal, comprises a pin nose and a support structure. A gap extends between the pin nose and the support structure.

A well tool device for transporting a heat generating mixture into a well pipe includes an upper connection section, a main housing section, and a sealing device. The main housing section includes a compartment for the heat generating mixture. The sealing device is provided below the main housing section. The sealing device includes a lower supporting element including a lower wedging surface; an upper wedging surface faced towards the lower wedging surface; and a sealing ring provided between the lower wedging surface and the upper wedging surface. The sealing element includes a plurality of thimble-shaped elements inserted into each other to form a torus. Relative axial movement between the lower wedging surface and the upper wedging surface in a direction towards each other provides radial expansion of the sealing element.

An open tip downhole expansion tool including a frustoconical member having a base at a diametrically smaller portion of the frustoconical member and a tip at a diametrically larger portion of the frustoconical member, the member having a radially outer zone and a radially inner zone and having an axial length extending from the base to the tip; an outer void in a material of the member along a length of the radially outer zone; and an inner void in a material of the member along a length of the radially inner zone, the outer and inner voids being located at different positions along the axial length of the frustoconical member, the outer and inner voids each causing the frustoconical member to present a first resistance to deformation when the voids are open and a higher resistance to deformation of the frustoconical member when the voids are collapsed.

A drill assembly has a stinger with downward oriented cups including an upper cup and a lower cup. The cups create a loss zone therebetween in a downhole environment. The downhole environment can be a shaft of a well. The loss zone can be filled with cement to plug the shaft. The downward oriented cups isolate the loss zone from the shaft and minimize the hydrostatic pressure above the upper cup.

A drill assembly has a stinger with downward oriented cups including an upper cup and a lower cup. The cups create a loss zone therebetween in a downhole environment. The downhole environment can be a shaft of a well. The loss zone can be filled with cement to plug the shaft. The downward oriented cups isolate the loss zone from the shaft and minimize the hydrostatic pressure above the upper cup.

The proposed technology relates to treatment of intervals of a productive formation, using a proposed device that is lowered into a wellbore to the depth of an interval, working fluid is admitted to the device's inner cavity below a lower through packer, supplied to a tubing string, through packers are activated, the wellbore annulus is isolated, the well casing is perforated, and the packers are deactivated. The device is lowered to a position between the packers, and is fixed by an anchor. Access of working fluid below the lower packer is cut off, and a hydraulic fracturing fluid is supplied, hermetically isolating the space between the packers. The device is then transferred to the next interval. The device includes the tubing sting, collar finder, upper through packer, hydraulic fracturing port, lower through packer, anchor and perforator. The technology prevents premature activation of the perforator, vibrations and damage to the packers.

A drill assembly has a stinger with downward oriented cups including an upper cup and a lower cup. The cups create a loss zone therebetween in a downhole environment. The downhole environment can be a shaft of a well. The loss zone can be filled with cement to plug the shaft. The downward oriented cups isolate the loss zone from the shaft and minimize the hydrostatic pressure above the upper cup.