Layered oil recovery device for petroleum deformation sleeve pipe well

Abstract

The invention relates to a layered oil recovery device for a petroleum deformation sleeve pipe well. According to the layered oil recovery device, the upper end of an oil suction pump cylinder is connected with an oil pipe, the lower end of the oil suction pump cylinder is connected with a reversing opening device, a first group of double-hydraulic bidirectional anchoring packers, a first hydraulic switch, a second group of double-hydraulic bidirectional anchoring packers, a second hydraulic switch and a blind plug; a plurality of oil layers are separated from each other through a packer setting seal, a hydraulic switch is arranged in each oil layer area, and layered mining control is achieved; and oil pumping work is achieved by feeding an oil pumping pump plunger to the oil pumping pumpcylinder. The layered oil recovery device has the beneficial effects that the outer diameter of the packer is reduced, the internal diameter of the packer is increased, the setting and sealing are firm, the unsealing is convenient, the repairing operation of the deformation sleeve is avoided, the service life of the oil well is prolonged, the hydraulic switch is lowered, layered oil extraction canbe achieved, interlayer interference between two oil layers or multiple oil layers can be avoided, the recovery ratio can be better improved, and a large amount of cost is saved for exploitation of petroleum.

Description

technical field [0001] The invention relates to a deformed casing oil recovery device and a process, in particular to a layered oil recovery device for oil deformed casing wells. Background technique [0002] In the process of oil extraction, due to the influence of various conditions such as geology and technology, there are a large number of oil wells with casing deformation, also known as casing transformation wells. Some of these deformed casings can be repaired, but most of them are repaired. Later, due to the internal stress still exists in the oil well, more serious secondary deformation will still occur, and some casings have even been repaired due to damage. Therefore, for these deformed casings to achieve effective production operations, another method can be adopted, specifically: designing a new special packer suitable for deformed casings, because the existing packers suitable for layered oil production The packer generally adopts the Y441 two-way anchor packer...

AI Technical Summary

Problems solved by technology

[0002] In the process of oil extraction, due to the influence of various conditions such as geology and technology, there are a large number of oil wells with casing deformation, also known as casing transformation wells. Some of these deformed casings can be repaired, but most of them are repaired. After that, due to the internal stress still exists in the oil well, more serious secondary deformation will still occur, and some casings have even been repaired due to damage.

Therefore, for these deformed casings to achieve effective production operations, another method can be adopted, specifically: designing a new special packer suitable for deformed casings, because the existing packers suitable for layered oil production The packer generally adopts the Y441 two-way anchor packer, that is, the working method of hydraulic setting, lifting and unsealing, but the existing conventional Y441 packer has a large outer diameter, such as a 5.5-inch TBG casing. The outer diameter of the packer is 115mm, and the outer diameter of the packer in the 7-inch TBG casing is 150mm

However, in the deformed casing, such as: 5.5-inch TBG deformed casing, it can pass through the gauge with an outer diameter of 110mm and a length of 1500mm, and a 7-inch TBG deformed casing can pass through a 140mm outer diameter and 1500mm long According to the general specification, under such a degree of deformation, the corresponding conventional packers cannot be lowered into the corresponding deformed casing, and reducing the size of the packer on the basis of the original structure will only result in a smaller inner diameter, which will cause The liquid output of subsequent oil production decreases, and the distance between the slips and the inner wall of the casing is large, and the anchoring of the slips to the inner wall of the casing cannot be realized

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