Abstract: A pump assembly for recovering hydrocarbons from downhole wells. The pump assembly comprising a seating surface adapted to sealingly engage an interior surface of a first circumferential seal means situated within production tubing when said pump assembly is in a downhole operative position. A downhole ported sleeve is further provided and comprises a first port means and a second port means. The ported sleeve is adapted to move within a seal sub comprising a lower seal means and an upper seal means. The first port means is positioned between the lower seal means and the upper seal means when the pump assembly is removed from the well, thereby preventing pressurized fluids and/or gases from reaching surface. A method for sealing a well upon removal of a pump is further disclosed.

Abstract: A pump assembly for recovering hydrocarbons from downhole wells. The pump assembly comprising a seating surface adapted to sealingly engage an interior surface of a first circumferential seal means situated within production tubing when said pump assembly is in a downhole operative position. A downhole ported sleeve is further provided and comprises a first port means and a second port means. The ported sleeve is adapted to move within a seal sub comprising a lower seal means and an upper seal means. The first port means is positioned between the lower seal means and the upper seal means when the pump assembly is removed from the well, thereby preventing pressurized fluids and/or gases from reaching surface. A method for sealing a well upon removal of a pump is further disclosed.

Abstract: A wellhead hydraulic drive unit to operate various styles of downhole pumps, including a hydraulic cylinder having a piston positioned therein for reciprocation within the cylinder; hydraulic fluid supply conduits contained within the hydraulic cylinder and fluidly communicative with the piston such that hydraulic fluid flowing through the hydraulic fluid supply conduits produces reciprocation of the piston within the hydraulic cylinder, a ram within the cylinder and operably connected to the piston, the ram having a bore; and production tubing inserted through the bore of the ram for enabling well fluid to be discharged from the well, wherein the hydraulic fluid supply conduits are radially offset from a longitudinal axis of the cylinder and the ram is oppositely radially offset from the longitudinal axis of the cylinder.

Abstract: A wellhead assembly to seal and suspend an in-casing hydraulic drive unit for a downhole pump, including pressure-containing wellhead body members with a vertical bore and a production bore at its uppermost portion. A hydraulic pump hanger is retained and sealed in the vertical bore. The hydraulic pump hanger suspends and seals the hydraulic cylinder, includes a bore extending vertically therethrough, forms at least one hydraulic line to communicate with hydraulic fluid supply lines, forms a hydraulic inlet port to each hydraulic line, and provides a check valve sealed in each hydraulic inlet port. The wellhead body member(s) includes a stem port aligned with each hydraulic inlet port, with a valve actuating stem sealed in each stem port to actuate each check valve between a normally closed and open position. The wellhead body member(s) also includes hydraulic injection port(s) formed to supply hydraulic fluid to each hydraulic inlet port.

Abstract: A wellhead hydraulic drive unit to operate various styles of downhole pumps, the wellhead hydraulic drive unit comprising: an hydraulic cylinder having a piston positioned therein for reciprocation within the cylinder, hydraulic fluid supply means for producing reciprocation of the piston, a ram within the cylinder and operably connected to the piston, the ram having a bore, and production tubing inserted through the bore of the ram for enabling well fluid to be discharged from the well, wherein the hydraulic fluid supply means are radially offset within the cylinder and the ram is oppositely radially offset within the cylinder. Offsetting the hydraulic fluid supply means and the ram allows for a larger inside diameter in both the production tubing and ram, increases the sizes of downhole pumps which can be installed/removed without removal of the drive unit, and serves as an anti-rotational feature with regards to the piston and ram.

Abstract: The present invention provides a wellhead hydraulic drive unit to operate various styles of downhole pumps, which is installed as an integral part of a wellhead thereby eliminating the need for a stuffing box. The wellhead hydraulic drive unit comprises a hollow hydraulic cylinder having a piston positioned therein, a hydraulic fluid supply attached to the hydraulic cylinder for raising the piston within the hydraulic cylinder, a hollow ram slideably received within the inner wall of the hydraulic cylinder and connected to the piston for reciprocation in response to the piston; and a production tube inserted through the ram for enabling well fluid to be discharged from the well.

Abstract: The present invention provides a wellhead hydraulic drive unit to operate various styles of downhole pumps, which is installed as an integral part of a wellhead thereby eliminating the need for a stuffing box. The wellhead hydraulic drive unit comprises a hollow hydraulic cylinder having a piston positioned therein, a hydraulic fluid supply means attached to the hydraulic cylinder for producing reciprocation of the piston within the hydraulic cylinder, a hollow ram means slideably received within the inner wall of the hydraulic cylinder and connected to the piston for reciprocation in response to the piston; and a production tube means inserted through the ram means for enabling well fluid to be discharged from the well.