Compressed packer sealing cylinder for oil and gas fields

Abstract

The invention discloses a compressed packer sealing cylinder for oil and gas fields, comprising a rubber cylinder which is sheathed on an inner core of a packer when in use. An outer sleeve made of polytetrafluoroethylene is sleeved outside the rubber cylinder. When the compressed packer sealing cylinder is in use, the rubber cylinder is compressed to radially expand and deform to act on the outer sleeve so that the outer sleeve tightly clings to an outer sleeve of an oil and gas well to form axial sealing; by utilizing the characteristics of the polytetrafluoroethylene, such as high temperature resistance, higher strength in comparison with rubber, low static friction coefficient, corrosion resistance and the like, the contact strength of a sealing surface is improved and the sealing cylinder can satisfy the using requirements on the corrosive working condition that the pressure is 90-105Mpa and the temperature is 160-180DEG C; in addition, axial sealing of the inner core of the packer is formed by the inward expansion of the rubber cylinder so as to meet the operating requirement of the packer. Furthermore, the rubber cylinder is internally provided with a pressure bearing core bar; when the rubber cylinder is compressed for a certain distance, the pressure bearing core bar plays a supporting role to bear continuously increased pressure, thereby preventing the rubber cylinder from being damaged when the deformation of the rubber cylinder is increased continuously, greatly enhancing the pressure bearing capability of the sealing cylinder and prolonging the service life.

Description

technical field [0001] The invention relates to packing equipment for oil and gas fields, in particular to a component in a packer for oil and gas fields. Background technique [0002] In the field of oil and gas field development, packers are important components for downhole injection and production processes such as layered oil production, layered water injection, layered fracturing, acidizing or mechanical plugging, and compression packers are more commonly used in packers. The elastic sealing cylinder is the core component of the compression packer, which will directly affect the working quality of the packer. [0003] Existing sealing cartridges are generally rubber cartridges made of rubber (such as Figure 10 As shown), it is deformed by extrusion at both ends to form a seal to the outer casing and the inner core (shaft or tube) of the oil and gas well, but when the pressure is too high, the compression of the rubber sleeve is greater, and it is easy to damage it. I...

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Problems solved by technology

[0004] In order to improve the pressure bearing capacity of the rubber cartridge, there have been rubber cartridges with metal shoulder protection (such as Figure 11 As shown), but due to the limitation of the material itself, its pressure bearing capacity, high temperature resistance and corrosion resistance are still limited, especially when the working environment pressure reaches 70-105Mpa and the temperature reaches about 160 °C, almost all seals at home and abroad None of the packer rubber cartridges can meet the requirements of use (for example, the representative packer rubber cartridges produced by Baker Company can only work for a short time under the working conditions of 84Mpa and 160°C, and cannot work under the working conditions of 100Mpa and 160°C. work normally)

Even the requirements in the Ministry of Chemical Industry standard HG / T 2701-95 "Compression (Ys) Packer Rubber Sleeves for Oil and Gas Fields" are far from being able to meet the current requirements of deep well production in oil and gas fields.

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