Reducing type oil pipe nipple

Abstract

The invention relates to the technical field of oil pipe nipples, and discloses a reducing type oil pipe nipple which comprises a support leg. A circular groove is formed above the front surface of the support leg, a movable rod extending upwards is movably sleeved with an inner cavity of the support leg, the top end of the movable rod is fixedly connected to the two sides of the bottom surface ofa first sealing pipe, the middle of the right side of the first sealing pipe is fixedly connected with an external thread head, and a hinge is arranged below the left side of the first sealing pipe.By adopting the design of a support arc plate and cooperating with the common use of two pistons at the same time, when a threaded rod is rotated, the up-down movable threaded rod can drive the pistons to synchronously move, so that the support arc plate can be supported outwards or retracted inwards, the synchronous change of the diameter value of a rubber layer is realized, and the change of theinner diameter value is realized on the basis of keeping the outer diameter unchanged, and the problem that the use limitation of a traditional device is large due to structural fixation is solved.

Description

technical field [0001] The invention relates to the technical field of oil pipe pup joints, in particular to a variable-diameter oil pipe pup joint. Background technique [0002] The tubing nipple is a short section of tubing. Compared with the tubing, it is only different in length, and the others are the same. The lengths are: 0.25m, 0.5m, 1m, 1.5m, etc. It is used to assemble the downhole string and is a very common accessory in industrial pipeline connections. The bushing nipple we often hear is a bushing that is shorter than the standard length bushing, which is what we often refer to as a short bushing. This is a tool used to adjust the position when the lower casing of the landing section is connected to the last casing. Generally, the short casing is connected with the cement head. In fact, the actual length of the tubing nipple is shorter than the standard tubing length, but except for the length, all other conditions of the tubing nipple fully meet the requireme...

AI Technical Summary

Problems solved by technology

[0003] Although the existing tubing sub-joints can meet the basic needs of use, the disadvantages are still very obvious. The main manifestations are: due to the different actual use conditions of the tubing sub-joints, the specifications that generally need to be used are also different. During pipeline operations such as construction and laying, it is often necessary to prepare tubing nipples of various specifications in order to be suitable for different usage situations. The fixed tubing nipples of this structure are not convenient to use and have certain limitations. At the same time, after the pipeline construction is completed, the pipeline is prone to loosening between the pipeline and the short joint of the oil pipe due to external problems, so there is a risk of oil leakage

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