Novel countersunk screw connector for coiled tubing and use method
A countersunk screw and connector technology, which is applied in drilling pipes, casings, earthwork drilling, etc., can solve the problems of poor friction effect, low bearing capacity of screw connectors, and limited application range, and achieve the purpose of enhancing the connection strength Effect
Active Publication Date: 2017-10-24
山东石油化工学院
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Problems solved by technology
As the hardness of the coiled tubing material is increasing, it is becoming more and more difficult to achieve plastic deformation in the coiled tubing through the process screw to reach the pit, resulting in the effect of increasing the friction effect by simply relying on the countersunk screw compression to become worse and worse, resulting in the load of the screw connector. The ability is not high, and the scope of use is getting less and less
The tensile and torsion resistance of the current general-purpose screw top-tight connectors cannot meet the needs of coiled tubing drilling construction
Method used
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[0020] The preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.
[0021] combine Figure 1-2 , to further describe the present invention:
[0022] The present invention mentions a new type of countersunk screw connector for coiled tubing, which includes a process screw, a countersunk screw, and a countersunk screw connection body 3. The countersunk hole is drilled and milled on the countersunk screw connection body 3 through the process screw, and the countersunk screw is installed in the countersunk hole. It is characterized in that: the process screw drills and mills 1 to 6 rows of countersunk holes on the connecting body 3 of countersunk screws, and installs countersunk screws in the countersunk holes. The middle part is a cyl...
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The invention relates to a novel countersunk screw connector for coiled tubing and a use method. According to the technical scheme of the novel countersunk screw connector for the coiled tubing, a countersunk screw is mounted in a counter bored hole, a technology screw is a shear force technology screw, the middle of the shear force technology screw is a cylinder, the lower portion of the cylinder is pointed teeth, the section of each pointed tooth is composed of a convex taper-surface and a concave taper-surface, and the countersunk screw is a shear force countersunk screw; and each convex taper-surface and the corresponding concave taper-surface intersect to constitute a cutting edge, scrap discharging grooves extend to the convex taper-surfaces and the concave taper-surfaces, and each scrap discharging groove and the corresponding convex taper-surface and the concave taper-surface form a cutting edge. The novel countersunk screw connector for the coiled tubing and the use method have the beneficial effects that the structure of the technology screw is improved, the countersunk screw whose section is in the same shape as the section of the technology screw is mounted, so that compaction friction is changed into shear effect, and thus the connection strength of the coiled tubing and the countersunk screw connector is enhanced; and, moreover, the shear force countersunk screw and a friction force countersunk screw can be used together, so that the connector and the coiled tubing achieve both the shear effect and friction effect.
Description
technical field [0001] The invention relates to the technical field of connecting a coiled tubing and a downhole tool, in particular to a novel countersunk screw connector for a coiled tubing and a use method thereof. Background technique [0002] Coiled tubing technology is the main operation carrying tool in the field of international oil drilling and production in recent years. It needs to be connected with downhole tools. Whether it is used for drilling or downhole operations, it must be connected with a special connector to carry out the next construction operation. Therefore, the coiled tubing connector is a necessary link in the popularization and application of coiled tubing technology. At present, there are many types of connector structures commonly used in China, which are mainly divided into: press-type connectors, slip-type connectors and screw-type connectors, and combinations of the three types. Among them, the screw top-tight connector mainly uses process sc...
Claims
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IPC IPC(8): E21B17/08
CPCE21B17/08Y02P70/10
Inventor 岳吉祥周扬理王国栋何冬青马立安刘文宁
Owner 山东石油化工学院