Fireflooding inner sealing tool
An internal sealing and tool technology, applied in the directions of sealing/packing, production fluid, wellbore/well components, etc., can solve the problem of loose sealing of fire drive packers, and achieve the effect of avoiding loose sealing
Active Publication Date: 2020-08-07
PETROCHINA CO LTD
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Problems solved by technology
[0004] The purpose of the present invention is to provide a fire drive internal sealing tool to overcome the problems of poor sealing of fire drive packers in the prior art, and the fire drive internal seal tool can be used as a packer in the development process of heavy oil fire drive , through the inward expansion of the sealing structure, the annulus between the fire flooding double-layer pipe strings is sealed to meet the needs of fire flooding layered injection
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[0041] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described with reference to the accompanying drawings.
[0042] The specific implementations of the present invention described here are only for the purpose of explaining the present invention, and should not be construed as limiting the present invention in any way. Under the teaching of the present invention, the skilled person can conceive any possible modification based on the present invention, and these should be regarded as belonging to the scope of the present invention. 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 also be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or interv...
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The invention discloses a fireflooding inner sealing tool. The tool comprises an outer pipe part, and an inserting type inner pipe part is arranged in the outer pipe part in slidable inserting, sealedand fixed modes; and a sealing structure which can expand inwards in the radial direction to abut against the outer wall of the inserting type inner pipe part in a sealing mode is arranged at the lower portion of the inner side of the outer pipe part in a sleeved mode. According to the fireflooding inner sealing tool, the tool can be used as a packer in a heavy oil fireflooding development process, and a tubular column annulus of a fireflooding double-layer tubular column is sealed through inward expansion of the sealing structure, so that the fireflooding layered injection requirement is met.
Description
technical field [0001] The invention relates to the technical field of petroleum exploitation, in particular to a fire-flooding internal sealing tool in the process of heavy oil fire-flooding exploitation. Background technique [0002] In the process of heavy oil fire flooding, the sealing tool plays a vital role, and its performance directly affects the recovery factor. At present, the main problem of fire drive packers is that the seal is not tight. Most packers use a single-stage piston method, the setting force is not enough, and the seal between the packer and the casing is not tight, resulting in the packer’s isolation effect. It is not ideal, and cannot effectively solve the problem of fire flooding layered injection under different injection pressure systems (mainly packers, insert seals and other supporting tools, long-term sealing and performance stability problems under alternating conditions of high and normal temperatures). [0003] Therefore, relying on many y...
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IPC IPC(8): E21B33/12E21B43/243
CPCE21B43/243E21B33/1208
Inventor 许佳赛田野陈鹏董亮胡燕朱晓亮苏畅伍宇博张成宇
Owner PETROCHINA CO LTD