Hanging packer for horizontal well multistage fracturing

Abstract

The invention discloses a hanging packer for horizontal well multistage fracturing. The hanging packer comprises an upper connector, a central pipe and a lower connector which are sequentially connected from top to bottom; a setting mechanism, a hanging mechanism and a sealing mechanism are installed outside the central pipe in a sleeving mode; the sealing mechanism comprises a packer element; the hanging mechanism comprise an upper slip and a lower slip installed on the central pipe in a sleeving mode, and the thread angle direction of the upper slip and the thread angle direction of the lower slip is different; the setting mechanism is located under the lower slip and comprises a lock ring, a lock ring sleeve and a piston, the lock ring, the lock ring sleeve, the central pipe and the lower connector form a piston cavity, the piston is installed in the piston cavity, the lock ring and the lock ring sleeve are located over the piston, a pressure transmitting hole communicated with the piston cavity is formed in the central pipe, and the pressure transmitting hole is located under the piston. The hanging packer is high in work sealing pressure, large in hanging load, reliable in setting and hanging and low in operation risk.

Description

technical field [0001] The invention belongs to the technical field of oil and natural gas well completion, and in particular relates to a bearing column weight and sealing casing annulus, which is often used to isolate the casing annulus and the top of an oil layer section, cooperate with other fracturing tools to complete layer isolation, implement Hanging packer for multi-stage fracturing operations in horizontal wells. Background technique [0002] In the multi-stage fracturing operation of horizontal wells, the hanging packer is required to be able to bear the load of the entire lower fracturing string and the axial load under the later fracturing operation conditions after setting, and at the same time isolate the casing annulus and the top of the oil layer section, Cooperate with other fracturing tools to complete layer isolation. [0003] The main technical defects of the currently known hanging packers are as follows: 1) The hanger and the packer are two-body and s...

AI Technical Summary

Problems solved by technology

[0003] The main technical defects of the currently known hanging packers are as follows: 1) The hanger and the packer are two-body and separated, the mechanism is complicated and the pressure is low, and the slips adopt a one-way structure, which cannot meet the requirements of fracturing. Two-way bearing construction requirements during the process

2) There is only a suspension mechanism, and it is one-way pressure bearing, with low bearing capacity, and does not have the ability to seal off the annular space of the oil sleeve, and cannot meet the two-way pressure bearing and isolation requirements of the pipe string in fracturing construction

3) Suspension packers with two-way pressure bearing and isolation capabilities generally have poor isolation capacity, short life, and low suspension capacity. At the same time, it is difficult to pass through the obstruction point after encountering obstruction midway, and cannot provide a large lifting and lowering capacity. , and does not have the ability to provide high torque

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