The present invention is a retrievable back pressure valve device and method of using the same that may be placed in tubing during well completion and retrieved as desired by dropping a ball down hole, which then interacts with the valve to shear the positioning points allowing for retrieval as the valve is allowed to move up the well to be removed from same.

A method of pumping fluids down a wellbore. The method first comprises providing a wellbore. The wellbore has been completed with a pumping system comprising a string of production tubing, a polished rod, and a sucker rod string extending down into the production tubing. A traveling valve is connected at a lower end of the sucker rod string. The method also includes adjusting a position of the polished rod relative to the pumping system to enable the traveling valve to tag a standing valve. The method further comprises compressing the traveling valve to cause the traveling valve to open. The method additionally includes pumping a fluid down the production tubing. The fluid is further pumped across the traveling valve and the standing valve, optionally while the standing valve remains seated.

A method of pumping fluids down a wellbore. The method first comprises providing a wellbore. The wellbore has been completed with a pumping system comprising a string of production tubing, a polished rod, and a sucker rod string extending down into the production tubing. A traveling valve is connected at a lower end of the sucker rod string. The method also includes adjusting a position of the polished rod relative to the pumping system to enable the traveling valve to tag a standing valve. The method further comprises compressing the traveling valve to cause the traveling valve to open. The method additionally includes pumping a fluid down the production tubing. The fluid is further pumped across the traveling valve and the standing valve, optionally while the standing valve remains seated.

A standing valve puller is provided. The standing valve puller is configured to latch onto an engagement pin when the engagement pin is run into the standing valve puller within a wellbore, downhole. The standing valve puller generally includes a tubular housing having an upper end and a lower end. The upper end comprises a pair of pivoting arms dimensioned to receive the engagement pin, while the lower end offers a threaded connector that connects to a standing valve. When the engagement pin is lowered through a through-opening preserved within the arms, the arms pivot to latch onto the engagement pin. When the engagement pin is lowered again, the arms pivot away from the engagement pin, providing a latch and release cycle. A method of unseating a standing valve from a seating nipple in a wellbore is also provided herein.

Systems and methods for fishing a metal object from a subterranean well include a fishing tool with housing, the housing being an elongated member having an internal bore. A first electromagnetic assembly is located within the internal bore of the housing and a second electromagnetic assembly is located at an outer diameter surface of the housing, the second electromagnetic assembly being moveable between a contracted position and an extended position where the second electromagnetic assembly extends outward from the housing. The first electromagnetic assembly is operable to generate a first magnetic force with an adjustable magnitude. The second electromagnetic assembly is operable to generate a second magnetic force with an adjustable magnitude, the first magnetic force and the second magnetic force having a same magnetic polarity.

A central shaft defines a first interior flow path. The central shaft disposed at least partially within a washover pipe. A lead tapered mill is positioned at a downhole end of the central shaft to center the downhole-type milling tool within a tubular. The lead tapered mill defines a second central flow path in line with the first interior flow path. Milling blades extend between the central shaft and the washover pipe. The milling blades are arranged to allow fluid flow around the milling blades. Each of the milling blades includes a tungsten-carbide hardened face and a soft steel body configured to support a load of the downhole-type milling tool during milling operations. A junk basket is positioned within the washover pipe uphole of the milling blades to receive and retain cuttings formed by the milling blades.

The method of providing a latch which is capable of passing a relatively short radius bend in a pipeline and then engaging a fishing neck on a service tool in a pipeline, and after the latch has engaged the service tool having the ability to pass the combination back through the relatively short radius bend in the pipeline.

The method of providing a latch which is capable of passing a relatively short radius bend in a pipeline and then engaging a fishing neck on a service tool in a pipeline, and after the latch has engaged the service tool having the ability to pass the combination back through the relatively short radius bend in the pipeline.

A reverse-circulation drilling assembly having an overshot subassembly and a head subassembly. In the event retrieval of the drilling assembly by reverse-circulation fails, the drilling assembly can be retrieved using a secondary overshot.

Disclosed combination impact tool generates optimized linear hammering and vibrational impacts. Flow of pressurized fluid through an upper section of the tool generates linear hammering impacts, and flow of pressurized fluid through a lower section of the tool generates vibrational impacts. Flow of pressurized fluid through the lower section induces an eccentric arm to rotate and cause vibrational impacts. While frequency of hammering impacts can be controlled by varying pressure of the fluid flowing through the upper section, the frequency and amplitude of vibrational impacts can be controlled by varying weight of the eccentric arm and by varying pressure of the fluid flowing through lower section.