Oil-layer setting packing method and special self-pressurization controller

Abstract

The invention discloses an oil-layer setting packing method and a special self-pressurization controller. The method includes the steps that a setting pipe column is put into the underground preset position, and then the self-pressurization controller is started to complete setting of packers; the setting pipe column comprises a pipe column body, the self-pressurization controller and the packers, wherein the self-pressurization controller and the packers are sequentially connected on the pipe column body from top to bottom, and the self-pressurization controller and the packers are also connected through control pipes; the self-pressurization controller is composed of a starting assembly, a pressurizing assembly and a pressure transmission joint, wherein the starting assembly, the pressurizing assembly and the pressure transmission joint are sequentially connected from top to bottom, and a high pressure area is formed between the pressurizing assembly and the pressure transmission joint; the pressurizing assembly adjusts increasing and reducing of the pressure in the high pressure area, and the pressure transmission joint is connected with a liquid control pipe through a quick joint; after the pressurizing assembly is started by the starting assembly, the pressure in the high pressure are is increased to the required set pressure through the pressurizing assembly, the pressure transmission joint is connected with the liquid control pipe through the quick joint, high pressure is transferred to the packers to allow differential pressure is generated inside and outside the packers to achieve setting.

Description

technical field [0001] The invention relates to oil well packer sealing oil layer technology, in particular to a method for setting and sealing oil layer and a special self-pressurization controller. Background technique [0002] At present, the use of packers to isolate oil layers is widely used in vertical wells, deviated wells, and horizontal wells for layered reconstruction, oil testing, oil production, testing, water search, and water plugging. There are six main methods of setting packers. Among them, the hydraulically driven method of setting packers has the advantages of convenient operation, high reliability, and no restriction of well type, and its application scale is gradually expanding. [0003] At present, the domestic and foreign methods that can be retrieved use hydraulically driven setting packers to isolate the oil layer. The setting pressure difference required for packer setting is mainly generated by two forms, one depends on the supporting tools in the ...

AI Technical Summary

Problems solved by technology

The third method is that the packer is connected to the wellhead equipment through a capillary for pressure setting. In this method, the entire string needs to be run with a capillary, and the capillary is even several kilometers long. The cost is high, the running is difficult, and the risk is high. And only suitable for vertically inclined wells

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