Dual-tube injection well safety production string

Abstract

The invention provides a dual-tube injection well safety production string. The dual-tube injection well safety production string comprises a ground control system, a fluid control pipeline, an annular safety valve, an annular packer, a positioning fillup valve, a pressure terminal, a string, an injection safety valve, a layered packer, an fillup valve, a plug, a bottom sand filtering pipe, an anchor, a sand control packer, a sand control screen, a sand control string, a casing string and a water injection string, wherein the upper part of the water injection string is arranged in the casing string, while the lower part is arranged in the sand control string; the sand control string is arranged in the casing string; the upper part of the sand control string is provided with a hanging packer, the middle part of the sand control string is provided with the sand control screen, a sand control packer and a sand control screen in turn, and the lower part of the sand control string is provided with an anchoring device, the bottom sand filtering pipe and the plug connected in turn; the water injection string is provided with the annular safety valve, the annular packer, the positioning fillup valve, the pressure terminal, the injection safety valve, the injection layered packer and the fillup valve in turn; and the annular safety valve is connected with a ground hydraulic control system through the fluid control pipeline. The dual-tube injection well safety production string has the characteristics of convenient and precise deployment, large drift diameter of injection and injection allocation, no risk of throwing and fishing, safe production, low shearing, environmental protection and the like, and is widely used in separate zone water injection process of oil production.

Description

1. Technical field [0001] The invention relates to an underground water injection pipe string for oil production, in particular to a safety production pipe string for a double-pipe separate injection well. 2. Background technology [0002] The separate-layer water injection string is an important process in oil production. The traditional water injection string is generally single-pipe injection, and its structure is to install and connect separate injection tools on the single-pipe water injection string. This water injection string It has always played a role in oil exploitation, but this water injection string structure has the following shortcomings or deficiencies: ① layer-by-layer injection is inaccurate, and the injection effect is poor; Not meeting the requirements; ③ For Haiyi or offshore oilfields, the safe injection production and environmental protection requirements cannot be guaranteed. 3. Contents of the invention [0003] The object of the present inventio...

AI Technical Summary

Problems solved by technology

[0002] The separate-layer water injection string is an important process in oil production. The traditional water injection string is generally single-pipe injection, and its structure is to install and connect separate injection tools on the single-pipe water injection string. This water injection string It has always played a role in oil exploitation, but this water injection string structure has the following shortcomings or deficiencies: ① layer-by-layer injection is inaccurate, and the injection effect is poor; Not meeting the requirements; ③ For Haiyi or offshore oilfields, it is impossible to guarantee their safety injection production and environmental protection requirements

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