High-temperature-resistant and high-pressure-bearing packer special for oil drilling

Abstract

The invention provides a high-temperature-resistant and high-pressure-bearing packer special for oil drilling. The high-temperature-resistant and high-pressure-bearing packer comprises an upper connector, a pressing cap, a trapezoidal sealing ring, a central pipe, an upper plastic cylinder seat, an upper plastic cylinder, a spacer ring, a middle plastic cylinder, a bushing, a lower plastic cylinder, a bushing shear pin, a lower plastic cylinder seat, a fixing screw, an adjusting sleeve, an upper piston, an upper cylinder sleeve, a sealing ring, an O-shaped sealing ring, a lower piston, a lower cylinder sleeve and a centralizer connector. The upper end of the central pipe is connected with a backwashing valve assembly, the upper end of the backwashing valve assembly is connected with the upper connector, the backwashing valve assembly comprises a backwashing valve seat and a valve body, the valve body is sleeved with the backwashing valve seat, the bushing shear pin is connected between the valve body and the backwashing valve seat, the backwashing valve seat is provided with a backwashing well arched passageway, and the backwashing well arched passageway comprises the pressing cap, the central pipe, the bushing and the lower plastic cylinder seat. By means of the high-temperature-resistant and high-pressure-bearing packer, in the seat seal process, an annular sealing oil sleeve space is divided into an upper-layer segment and a lower-layer segment, the backwashing well arched passageway rapidly unseals the packer, and inverse well-flushing, sand washing and the like are conducted.

Description

technical field [0001] The invention relates to a downhole tool used for delamination in oil production engineering, in particular to a special packer for oil drilling with high temperature resistance and high pressure bearing. Background technique [0002] The deep volcanic rock reservoirs in most oilfields in my country are tight, with porosity (generally 3%-20%), very low permeability and strong heterogeneity. Most wells are naturally less productive and must be fractured to achieve industrial productivity. However, due to the deep burial of volcanic rock gas reservoirs (generally 3000-4500m), high geothermal gradient (generally 4-4.5°C / 100m), complex and hard lithology, and a maximum fracture pressure of more than 80MPa, the previous volcanic rock fracturing There will be many quality problems in deep well fracturing strings, such as low temperature and pressure resistance indicators of fracturing tools, low fracturing scale, and inability to implement layered reconstru...

AI Technical Summary

Problems solved by technology

It overcomes the deficiencies of the existing packers, such as lax interlayer isolation, difficulty in unsealing, and inability to realize subdivided layer fracturing technology

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