초록 ▼

A tool having a tube string made of inner and outer coaxial tubes, and a dewatering natural gas-assisted pump at the bottom of the tube string. The pump includes a nozzle, an eductor, and a diffuser. The nozzle has a central inlet and a number of primary angled gas outlets, each opening to a gas sup

A tool having a tube string made of inner and outer coaxial tubes, and a dewatering natural gas-assisted pump at the bottom of the tube string. The pump includes a nozzle, an eductor, and a diffuser. The nozzle has a central inlet and a number of primary angled gas outlets, each opening to a gas supply space between outer and inner pipes, and to the interior of the inner tube. These angled outlets allow the gas to accelerate, contributing to a venturi effect in the tool. A fluids/debris/etc. mixture moves from the nozzle ring to the inwardly inclined eductor, which causes the mixture to converge. Then, the mixture diverges along the outwardly inclined diffuser to the inner pipe in which the mixture moves to the surface. At the convergence/divergence area, the venturi effect is enhanced. That is, a number of secondary outlets, formed in the diffuser, introduces additional gas from the gas supply space to the interior of the inner tube.

대표청구항 ▼

1. A tool for dewatering a well, comprising:a first elongated, hollow tube having a first end, a second end, and a longitudinal axis, a second elongated hollow tube having a first end and a second end, being coaxial with and internal of the first tube, and including an interior in which fluid moves,

1. A tool for dewatering a well, comprising:a first elongated, hollow tube having a first end, a second end, and a longitudinal axis, a second elongated hollow tube having a first end and a second end, being coaxial with and internal of the first tube, and including an interior in which fluid moves, a space formed between the first and second tubes through which gas moves in a first direction from the second end to the first end, a pump having a first end, a second end and a middle portion, and including a nozzle at the first end, an eductor at the middle portion and a diffuser at the second end, said pump being arranged at the first ends of the first and second tubes, said pump also including a central inlet for allowing fluid external of the tool to move into the central inlet and into the interior of the second tube along a second, opposite direction, said nozzle including a plurality of primary outlets extending from the space to the interior of the second tube for introducing gas moving in the space in the first direction into the fluid moving in the second direction, said eductor including a converging portion, said diffuser including a diverging portion, and a plurality of secondary outlets, located in the pump downstream of the plurality of primary,outlets, and extending from the space to the interior of the second tube, said plurality of secondary outlets introducing gas moving in the first direction into the fluid moving in the second direction in the interior of the second tube.