Inverted buckling joint
An undercut and joint technology, which is applied in the direction of drilling equipment, earthwork drilling, drill pipe, etc., can solve problems such as inability to undercut normally, easy to cause downhole accidents, thick end face of undercut joints, etc.
Pending Publication Date: 2018-01-19
BEIJING TALENT NEW ENERGY TECH DEV CO LTD
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Problems solved by technology
[0003] At present, there is no uniform technical standard for the undercut joints used in geothermal wells. Most of the undercut joints are processed by the on-site personnel. The end face of the undercut joint is too thick, resulting in obvious steps at the joint. As a result, the drill bit is stuck on the step, and it is impossible to drill and wash the well; and the buckle type of the undercut joint is not the general standard of the API industry, which makes it difficult to back out, which is likely to cause downhole accidents and cannot be backed out normally. As a result, the geothermal well cannot be put into production, which seriously affects the well completion quality of the geothermal well
Method used
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[0021] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.
[0022] In the description of the present invention, it should be noted that unless otherwise specified, the meaning of "plurality" is two or more; the terms "upper", "lower", "left", "right", "inner ", "outside", "front end", "rear end", "head", "tail", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and Simplified descriptions, rather than indicating or implying that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and thus should not be construe...
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The invention provides an inverted buckling joint. The inverted buckling joint comprises a first joint body and a second joint body. A first end of the first joint body is provided with a positive buckling thread matched with an intermediate casing. A second end of the first joint body and a first end of the second joint body are provided with negative buckling threads which are matched with eachother. A second end of the second joint body is provided with a positive buckling thread matched with a drilling rod. The inverted buckling joint is composed of the first joint body and the second joint body, and the first end of the first joint body is in positive buckling connection with the intermediate casing; the second end of the first joint body is in negative buckling connection with the first end of the second joint body; the second end of the second joint body is in positive buckling connection with the drilling rod in a matched mode; and the inverted buckling joint is simple in structure and easy to machine, convenient and safe to buckle invertedly, and the situation that a geothermal well cannot be put into production due to the fact that the quality of well completion of the geothermal well is influenced by failure of inverted buckling is avoided.
Description
technical field [0001] The invention relates to the technical field of geothermal well completion, in particular to an undercut joint. Background technique [0002] At present, with the increasing development of geothermal resources, the completion of geothermal wells directly affects the effective development and utilization of geothermal resources, and more and more attention is paid to the completion of geothermal wells. an indispensable part of the. [0003] At present, there is no unified technical standard for the undercut joints used in geothermal wells. Most of the undercut joints are processed by the on-site personnel. The end face of the undercut joint is too thick, resulting in obvious steps at the joint. As a result, the drill bit is stuck on the step, and it is impossible to drill and clean the well; and the buckle type of the undercut joint is not the general standard of the API industry, which makes it difficult to back out, which is likely to cause downhole ...
Claims
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Login to View More IPC IPC(8): E21B17/08E21B17/042
Inventor 叶宏宇张海林
Owner BEIJING TALENT NEW ENERGY TECH DEV CO LTD