CN216381308U - Blanking plug - Google Patents

Abstract

The utility model relates to the field of oilfield workover tools, in particular to a blanking plug. The device comprises a sealing mechanism, a pressure bearing mechanism and a positioning mechanism which are connected in sequence. The positioning mechanism comprises a positioning mandrel, a connecting shaft and a clamping jaw shaft which are sequentially connected, and a push cylinder is sleeved outside the clamping jaw shaft; the outer surface of the positioning mandrel is provided with a symmetrical dovetail inclined plane and a positioning anchor tooth, the upper end of the push cylinder is connected with the positioning anchor tooth in a propping manner, the lower end of the push cylinder is connected with a positioning sleeve, the positioning sleeve is hung and connected with two clamping jaws when closed, and a large spring for providing upward axial force for the positioning anchor tooth is arranged in the push cylinder; the jack catch shaft and the connecting shaft are internally provided with a jack rod and a small spring for providing downward axial force, and the jack rod acts on the jack catch. When the blanking plug moves downwards to the suspended part of the oil pipe, the two clamping jaws of the positioning mechanism automatically expand to the outside of the oil pipe under the action of the spring, and the positioning sleeve of the positioning mechanism drives the push cylinder to push the positioning anchor tooth to move upwards along the inclined plane of the positioning mandrel to clamp the oil pipe, so that the blanking plug does not move downwards, the automatic positioning of the blanking plug is realized, and the plugging operation is completed.

Description

Blanking plug

Technical Field

The utility model relates to the field of oilfield workover tools, in particular to a plug which is used for plugging an open oil pipe.

Background

In the prior art, a blanking plug is generally used for plugging a normal tubular column, the blanking plug is lowered to a preset position in a hydraulic or mechanical mode, a dovetail inclined-plane slip is used for preventing upward movement, and a rubber plug is used for sealing. This type of plug is not available for open, overhead tubing because it cannot be bottom positioned.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide the open type self-positioning oil pipe plugging device which is improved in structure, safe, reliable and convenient to use, aiming at the defects.

The technical solution of the utility model is as follows: the blanking plug comprises a sealing mechanism and a pressure-bearing mechanism which are connected in sequence, and is characterized by also comprising a positioning mechanism connected with the pressure-bearing mechanism; the positioning mechanism comprises a positioning mandrel, a connecting shaft and a clamping jaw shaft which are sequentially connected, and a push cylinder is sleeved outside the clamping jaw shaft; the outer surface of the positioning mandrel is provided with symmetrical dovetail inclined planes and positioning anchor teeth matched with the dovetail inclined planes, the upper end of the push cylinder is connected with the positioning anchor teeth in a butting mode, the lower end of the push cylinder is connected with a positioning sleeve, the positioning sleeve is connected with two clamping jaws in a hanging mode when the push cylinder is closed, and a large spring for providing upward axial force for the positioning anchor teeth is arranged in the push cylinder; the jack catch shaft and the connecting shaft are internally provided with a jack rod and a small spring for providing downward axial force, and the jack rod acts on the jack catch.

The claw is fixed by a lock pin and a nut.

The utility model has the advantages that: the positioning mechanism is added, when the blanking plug moves downwards to the suspended part of the oil pipe, two clamping claws of the positioning mechanism automatically expand to the outside of the oil pipe under the action of the spring, and a positioning sleeve of the positioning mechanism drives the push cylinder to push the positioning anchor tooth to move upwards along the inclined plane of the positioning mandrel to clamp the oil pipe, so that the blanking plug does not move downwards, the automatic positioning of the blanking plug is realized, and the plugging operation of the blanking plug is completed.

Embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

Drawings

FIG. 1 is a schematic diagram of the present invention.

Fig. 2 is a schematic view of an enlarged upper section of fig. 1.

FIG. 3 is an enlarged schematic view of the lower part of FIG. 1.

Figure 4 is a schematic view of the positioning mandrel configuration.

Fig. 5 is a schematic left view of fig. 4.

Figure 6 is a diagrammatic view of a positioning anchor configuration.

Fig. 7 is a schematic diagram of the right side view of fig. 6.

Fig. 8 is a schematic view of the jaw shaft structure.

Fig. 9 is a schematic view of the pusher structure.

Figure 10 is a schematic view of a positioning sleeve configuration.

Figure 11 is a diagrammatic view of the jaw configuration.

Fig. 12 is a schematic view of fig. 11 taken along the line a-a.

Detailed Description

Referring to fig. 1-12, the main part names are as follows: 1. the nut, 2, a cylindrical rubber sleeve press ring, 3, a cylindrical rubber sleeve, 4, a sealing sleeve, 5, a spacer ring, 6, a tower-shaped rubber sleeve, 7, a sealing shaft, 8, a tower-shaped rubber sleeve press ring, 9, a pressure-bearing mandrel, 10, a pressure-bearing anchor tooth, 11, a baffle ring, 12, a positioning mandrel, 13, a positioning anchor tooth, 14, an anchor tooth pull rod, 15, a connecting shaft, 16, a large spring, 17, a small spring, 18, a jaw shaft, 19, a push cylinder, 20, a push rod, 21, a positioning sleeve, 22, a rotating shaft, 23, a jaw, 24, a lock shaft and 25.

The blanking plug is added with a self-positioning mechanism on the basis of a common blanking plug.

Referring to fig. 1-12, the blanking plug is composed of a sealing mechanism, a pressure-bearing mechanism, and a positioning mechanism. The positioning mechanism comprises a positioning mandrel 12, a connecting shaft 15 and a jaw shaft 18 which are sequentially connected, and a push cylinder 19 is sleeved outside the jaw shaft 18; the outer surface of the positioning mandrel 12 is provided with symmetrical dovetail inclined planes and positioning anchor teeth 13 matched with the dovetail inclined planes, the upper end of a push cylinder 19 is connected with the positioning anchor teeth 13 in a propping manner, the lower end of the push cylinder 19 is connected with a positioning sleeve 21, the positioning sleeve 21 is connected with two clamping jaws 23 when closed in a hanging manner, and a large spring 16 for providing upward axial force for the positioning anchor teeth 13 is arranged in the push cylinder 19; inside the jaw shaft 18 and the connecting shaft 15 there is a jack 20 and a small spring 17 providing a downward axial force, the jack 20 acting on the jaw 23. The jaws 23 are secured by a locking pin 24 and a nut 25.

Referring to fig. 2, the sealing mechanism: the sealing device comprises a sealing shaft 7, wherein threads are arranged on the upper part and the lower part of the sealing shaft 7, and a nut 1, a cylindrical rubber cylinder pressing ring 2, a cylindrical rubber cylinder 3, a tower-shaped rubber cylinder 6 and a tower-shaped rubber cylinder pressing ring 8 are sequentially sleeved on the sealing shaft 7. The sealing and blocking effect of the blanking plug is realized by adjusting and locking the nut 1. The lower end of the sealing shaft 7 is connected with a bearing mandrel 9 in the bearing mechanism.

Referring to fig. 2, the pressure mechanism: the plug consists of a pressure bearing mandrel 9 and pressure bearing anchor teeth 10 on the pressure bearing mandrel, and the outer teeth of the pressure bearing anchor teeth 10 bite the inner wall of an oil pipe by utilizing an inclined plane dovetail structure to bear the upward force of the plug.

Referring to fig. 3-12, the positioning mechanism: is connected with a bearing mandrel 9 in a bearing mechanism by a positioning mandrel 12. The positioning mechanism comprises a positioning mandrel 12, a positioning anchor tooth 13, a connecting shaft 15, a large spring 16, a small spring 17, a jaw shaft 18, a push cylinder 19, a push rod 20, a positioning sleeve 21, a jaw 23 and the like. An inclined dovetail structure is adopted between the positioning mandrel 12 and the positioning anchor teeth 13, and the outer teeth of the positioning anchor teeth 13 can bite the inner wall of the oil pipe. One end of the anchor tooth pull rod 14 is connected with the positioning anchor tooth 13, the other end of the anchor tooth pull rod is hung in a T-shaped groove on the upper end surface of a push cylinder 19, the push cylinder 19 is sleeved on the connecting shaft 15 and limited by a large spring 16 and a jaw shaft 18, and the push cylinder always bears the upward force provided by the large spring 16. The lower end of the push cylinder 19 is connected with a positioning sleeve 21, and the positioning sleeve 21 is used for hanging two clamping jaws 23 when closed. The small spring 17 and the jack rod 20 are limited in the connecting shaft 15 by the jack rod shaft 18, and the small spring 17 always gives a downward force to the jack rod 20 to act on the jack rod 23. The jaw 23 is a two-piece structure fixed to the lower end of the jaw shaft 18 by the rotating shaft 22 and can rotate around the jaw shaft 18 in the radial direction. The jaws 23 are open in the free state under the action of the small spring 17 and ram 20, and are closed and suspended in the locating sleeve 21 before transport and downhole and are secured by a locking pin 24 and nut 25.

Referring to fig. 1-12, in operation of the plug, the jaws 23 are moved into the well and the nut 25 is removed, and after the pin 24 is removed, the plug is moved into the well by water injection and pressurization. Injecting water and pressurizing, wherein the pressure is slightly greater than the internal pressure of the oil pipe to push the oil pipe into the oil pipe, the claw 23 descends to the suspended part of the oil pipe and gradually expands to the outer diameter of the oil pipe until the claw is separated from the positioning sleeve 21, the positioning sleeve 21 drives the push cylinder 19 to push the positioning anchor teeth 13 to move upwards along the inclined plane of the positioning mandrel 12 to clamp the inner wall of the oil pipe, so that the blanking plug does not descend, and automatic positioning is realized.

When the blanking plug is automatically positioned, the pressure of the oil pipe is released, the pressure-bearing anchor teeth 10 clamp the inner wall of the oil pipe, the blanking plug cannot go upwards, and the blanking plug seals liquid at the lower part of the oil pipe by using a sealing mechanism consisting of the cylindrical rubber cylinder 3, the tower-shaped rubber cylinder 6 and the like to finish the plugging operation.

The foregoing description is only exemplary of the utility model and is not intended to limit the spirit of the utility model.

Claims (2)

1. The blanking plug comprises a sealing mechanism and a pressure-bearing mechanism which are connected in sequence, and is characterized by also comprising a positioning mechanism connected with the pressure-bearing mechanism; the positioning mechanism comprises a positioning mandrel (12), a connecting shaft (15) and a jaw shaft (18) which are sequentially connected, wherein a push cylinder (19) is sleeved outside the jaw shaft (18); the outer surface of the positioning mandrel (12) is provided with symmetrical dovetail inclined surfaces and positioning anchor teeth (13) matched with the dovetail inclined surfaces, the upper end of a push cylinder (19) is connected with the positioning anchor teeth (13) in a jacking way, the lower end of the push cylinder (19) is connected with a positioning sleeve (21), the positioning sleeve (21) is articulated with two clamping jaws (23) when closed, and a large spring (16) for providing upward axial force for the positioning anchor teeth (13) is arranged in the push cylinder (19); the jaw shaft (18) and the connecting shaft (15) are internally provided with a mandril (20) and a small spring (17) for providing downward axial force, and the mandril (20) acts on the jaw (23).

2. The blanking plug of claim 1, wherein the jaw (23) is secured by a locking pin (24) and a nut (25).

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