A device and method for separating layers of a thermal recovery well

Abstract

The invention discloses a separation device and method for thermal recovery well layered sections. The separation device includes a central pipe, the upper end of the central pipe is connected to an upper joint, and the lower end of the central pipe is connected to a lower joint; the outer wall of the central pipe is tightly sleeved with a high-temperature-resistant seal The material inner sealing cylinder is covered with a high temperature resistant sealing material outer sealing cylinder outside the high temperature resistant sealing material inner sealing cylinder. An annular space is formed between the outer sealing cylinders of high-temperature sealing material, and the oval metal sealing ring is located in the above annulus as a whole; the oval metal sealing ring has a closed inner cavity, and the central tube has a radial hole with a Install a steam inlet check valve into the hole. In the present invention, the steel outer diameter of the metal sealing ring is relatively small, has a multi-channel sealing structure, and does not require special smoothness and special length requirements on the sealing surface.

Description

technical field [0001] The invention relates to an isolation device for petroleum engineering, in particular to an isolation device and method for thermal recovery well layered sections. Background technique [0002] In the process of oilfield development, it is usually necessary to use one string to achieve multiple times of sealing and unsealing. The packer is the most commonly used tool for sealing and unsealing. Generally, the packer can be divided into self-sealing type, compression type, wedging type, expansion type, combined type, etc. according to the sealing principle. : Lifting column type, rotating column type, self-sealing type, thermal expansion type, etc. As described in patent 104120996A. [0003] For the thermal recovery of heavy oil, the high temperature steam injection packer is mainly used to separate the steam injection in the layered section of the heavy oil well. When heavy oil wells are used for oil recovery operations, it is necessary to inject ste...

AI Technical Summary

Problems solved by technology

[0005] At present, in oil development, whether extrusion or self-expanding sealing materials are used for sealing, the extruded steel body of the packer is relatively thick. Taking the 7in well completion casing as an example, its inner diameter is 159mm, while the steel body of the sealing packer The outer diameter reaches 150mm, and it is easy to encounter obstacles during the process of lowering and lifting, and cannot achieve effective sealing

At the same time, due to the price of sealing materials and the layout of the sealing structure, the sealing section is short, and the inner wall of the casing is required to be clean, and there must be no couplings

Therefore, the sealing parts are often not perfect, and steam leakage is prone to occur during the steam injection process, resulting in poor separation effect of the downhole steam injection string and affecting the steam injection effect of thermal recovery

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