a packer
A technology of packer and sealing tube, applied in sealing/packing, wellbore/well components, earth-moving drilling, etc., can solve the problems of sealing ring failure, high temperature field requirements, thermal agent leakage and so on
Active Publication Date: 2021-02-26
江苏柯沣石化机械有限公司
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Problems solved by technology
At present, there are usually two types of steam injection packers for thermal recovery, thermal setting and hydraulic setting. Among them, the hydraulic setting packer has better steam injection effect at the initial stage, but it is prone to poor sealing in the later stage, mainly because there is no The continuous setting force maintains the continuous setting effect; while the thermal setting packer has higher requirements on the temperature field, and the phenomenon of thermal agent leakage due to the failure of the sealing ring due to high temperature often occurs
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[0024] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described The embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.
[0025] It should be noted that when an element is referred to as being “disposed on” another element, it may be directly on the other element or there may be another element in between. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or it may be present interveni...
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The invention discloses a double-level piston steam injection packer. A center pipe, a seal pipe, an outer hydraulic cylinder fixedly sleeving the center pipe, and a power unit arranged between the center pipe and the outer hydraulic cylinder in a sleeved manner are included. The power unit is connected with the outer hydraulic cylinder through a setting pin. The center pipe and the power unit areconnected through a locking unit. The locking unit and the center pipe are connected through an unsealing pin. The locking unit only allows the power unit to upwards move. A closed hydraulic cavity is formed above the part, between the seal pipe and the center pipe, of the power unit and is fully filled with expansion liquid. The power unit comprises a first piston and a second piston. A first piston cavity is further arranged below the first piston, and a second piston cavity is further arranged below the second piston. When the power unit upwards moves, the hydraulic cavity is compressed. Through the double-level piston steam injection packer, the steam injection effect can be improved.
Description
technical field [0001] The present application relates to a thermal recovery packer, in particular to a dual-stage piston steam injection packer in the field of heavy oil thermal recovery. Background technique [0002] In the heavy oil production process, the thermal recovery packer plays a vital role, and its performance directly affects the recovery factor. At present, there are usually two types of steam injection packers for thermal recovery, thermal setting and hydraulic setting. Among them, the hydraulic setting packer has better steam injection effect at the initial stage, but it is prone to poor sealing in the later stage, mainly because there is no The continuous setting force maintains the continuous setting effect; while the thermal setting packer has higher requirements on the temperature field, and it often occurs that the temperature is too high to cause the sealing ring to fail and the thermal agent leaks. [0003] In view of the above problems, a two-stage p...
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IPC IPC(8): E21B33/126
CPCE21B33/1208E21B33/126
Inventor牛文智
Owner江苏柯沣石化机械有限公司