Pressure control valve for independent hydraulic control packer

Abstract

The invention discloses a pressure control valve for an independent hydraulic control packer. The pressure control valve comprises a central pipe, an outer sleeve, an one-way valve, and a pressure relief device. The outer side of the central pipe is sleeved with the outer sleeve in a hollow manner, and a hydraulic control oil flow annular is formed between the outer sleeve and the central pipe; anoutwardly convex annular platform is arranged on the outer wall of the upper end of the central pipe, and the upper end of the outer sleeve is connected with the outer wall of the annular platform; the annular platform is provided with a separate axial upper hydraulic oil passage, the lower end of the outer sleeve is provided with a separate axial lower hydraulic oil passage, and the upper hydraulic oil passage and the lower hydraulic oil passage are communicated with the hydraulic control oil flow annular; and a lower port of the upper hydraulic oil passage is connected with the one-way valve through which the hydraulic oil can only flow downward, and the pressure relief device is arranged on the outer wall of the central pipe. According to the pressure control valve for the independenthydraulic control packer, by adopting a built-in hydraulic oil single-fluid design, flow direction control of the hydraulic oil in hydraulic control pipelines is achieved, by adopting a double-pistonlinkage design, the opening and closing of a double wall cavity of the pressure control valve and oil pipeline passages are achieved, and demands of downhole rapid pressure relief and unsealing of a marine hydraulic control packer are met.

Description

technical field [0001] The invention relates to a downhole tool for completion construction of an offshore water injection well, in particular to a pressure control valve for an independent hydraulic control packer. Background technique [0002] The Guantao Formation, the main oil reservoir in Shengli Offshore Chengdao Oilfield, has strong heterogeneity, large interlayer pressure difference, and easy sand production, which put forward higher technical requirements for the reliability of the layered water injection process. At the same time, beach oilfields are mostly developed with highly inclined directional wells, the platform is small, and the cost of operation maintenance and subsequent test acidification is high, and the long-term requirements for the layered water injection process are high. At present, the independent liquid-controlled layered water injection technology has greater applicability and long-term effect in offshore water injection wells, and has been impl...

AI Technical Summary

Problems solved by technology

In the specific case of hydraulic oil, the pressure regulation operation of the hydraulic control pipeline is carried out at the wellhead. Affected by the total length of the hydraulic control pipeline, the friction of the hydraulic oil in the narrow diameter hydraulic control pipeline is very large, especially when the pressure is released. During the process, the hydraulic oil pressure at the bottom of the well is difficult to quickly upload to the wellhead, that is, the pressure of the wellhead hydraulic control pipeline is 0 MPa, and the downhole packer is still subjected to a large setting pressure difference, resulting in the packer not being able to unseal and unable to carry out Shaft well cleaning construction

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