An extended gas lift method for permanent completion strings

Abstract

The invention discloses an extended gas lift method of a permanent-type well completion tubular column, and belongs to the field of drainage and gas production. The method comprises the following steps that wiper trip and perforation are conducted on a producing oil tube, and an upper perforation point and a lower perforation point are formed at the position, located at the two ends of a permanent-type packer, of a tube body of the producing oil tube; an extending gas lift tubular column is tripped into the producing oil tube by using a coiled oil tube and comprises a releasing tool, an upperpacker, a gas lift oil tube, a lower packer and a ball seat which are connected sequentially from top to bottom, so that the upper perforation point and the lower perforation point are located betweenthe upper packer and the lower packer; a steel ball setting ball seat is thrown into the coiled oil tube, pressing is conducted so that the upper packer and the lower packer are simultaneously set into the producing oil tube, and pressing is continuously conducted to press the ball seat into the well bottom; the releasing tool and the coiled oil tube are disconnected, and the coiled oil tube is removed out; and gas is injected into a producing casing, the injected gas sequentially passes through an oil sleeve annulus above the permanent-type packer, the upper perforation point, an annulus ofthe gas lift oil tube and the producing oil tube, the lower perforation point and an oil sleeve annulus below the permanent-type packer, and accumulated liquid at the well bottom is lifted to the ground.

Description

technical field [0001] The invention relates to the technical field of drainage and gas recovery, in particular to an extended gas lift method for a permanent completion pipe string. Background technique [0002] In the process of oil and gas development, gas wells are usually used to extract the oil and gas in the underground production layer. However, when the gas well is developed to the middle and later stages, the formation near the wellbore and bottom of the gas well has too much liquid accumulation or serious water production. Carry out water drainage and gas recovery, so that the gas well can resume normal production. It can be seen that it is very necessary to provide a drainage and gas recovery process. [0003] The drainage gas recovery technology provided by the prior art is divided into mechanical technology and physical chemical technology, and the mechanical technology includes pipe string drainage gas recovery technology, gas lift drainage gas recovery techn...

AI Technical Summary

Problems solved by technology

Under the premise of no workover, the drainage and gas recovery technology provided by the existing technology cannot realize the drainage and gas recovery of this type of "three high" gas wells

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