Semi-sealing well sealing device for oil well fracturing

Abstract

The invention relates to the technical field of petroleum exploitation, and discloses a semi-sealing well sealing device for oil well fracturing. The device comprises a shell, wherein a driving rolling pin is fixedly arranged on the left side of the shell, a driven rolling pin is fixedly arranged on the right side of the shell, rolling bearings are arranged on the extensions of the driving rollingpin and of the driven rolling pin, the driving rolling pin and the driven rolling pin are arranged on the shell through the rolling bearings, the tops of the driving rolling pin and of the driven rolling pin mesh with a driving disc, and protruded textures are arranged on the bottom of the driving disc. According to the semi-sealing well sealing device for oil well fracturing, through cooperativeuse of the driving rolling pin and the driving disc, the driving disc can be driven to rotate when the driving rolling pin is rotated; due to the fact that the driving disc can drive arc-shaped sealing cores at the top of the driving disc to move in the opposite directions through clamping teeth, opening or closing effect is achieved; and in the process, linkage between the two arc-shaped sealingcores can be realized only by rotating one driving rolling pin, and compared with a mode that two screw rods are operated simultaneously, no skill is needed, and the device is more convenient and practical.

Description

technical field [0001] The invention relates to the technical field of oil exploitation, in particular to a semi-sealing and sealing device for oil well fracturing. Background technique [0002] In the field of oil exploitation, fracturing is usually used to increase oil production, and at the wellhead of the oil well, a well sealer is required to seal and isolate the environment inside the well from the outside environment, so as to prevent waste caused by accidental spillage of oil. [0003] see Figure 1-2 , the existing semi-sealed sealer structure includes a shell 1, four threaded holes 2 are symmetrically arranged on the front of the shell 1, and a movable chamber 3 is provided on the top of the shell 1, and a half-sealed core assembly is slidably installed inside the movable chamber 3. 4, both sides of the shell 1 are provided with bearing sleeves 5, both ends of the bearing sleeve 5 are provided with screw rods 6, and the middle part of the semi-sealed core assembly ...

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Problems solved by technology

[0004] The problems existing in the existing semi-sealed well sealer include: 1. In the cold winter, the internal rainwater of the well sealer freezes, and it is necessary to use high-temperature steam to heat the screw mandrel 6 before turning it, otherwise it is easy to cause the screw mandrel to be pulled off, so the working efficiency Low; 2. The operation of the screw rod 6 is cumbersome, and the two screw rods 6 need to be rotated at the same time, and the number of rotations is 9.5. If the rotation is not synchronized, the oil well will not be well sealed, and the well fluid may overflow; 3. Due to the half-sealed core The sub-assembly 4 is located inside the movable chamber 3. If the screw rod 6 is not rotated in place, it is easy to cause the drilling tool to scratch the semi-seal core assembly 4, which will affect the sealing.

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