Oil pipe falling protector

Abstract

An oil pipe hole is formed in the center of the bottom of an oil cylinder outer shell, a taper sleeve is fixedly arranged in the oil cylinder outer shell, a sealing cavity is formed between the taper sleeve and the side wall of the oil cylinder outer shell, a piston sleeve is arranged in the sealing cavity, and the sealing cavity is divided into an upper pressure cavity and a lower pressure cavity through the piston sleeve. An upper fluid connector and a lower fluid connector are arranged on the side wall, opposite to the upper pressure cavity and the lower pressure cavity, of the oil cylinder outer shell respectively, a conical anti-falling frame is sleeved with the taper sleeve, the upper end of the piston sleeve abuts against the bottom face of the upper edge of the anti-falling frame, and anti-falling pin rollers which are evenly distributed are arranged on the anti-falling frame in the circumferential direction. The device is simple in structure and convenient to operate, automatic control can be achieved, linkage with the workover rig is facilitated, the working efficiency is improved, and the possibility of manual operation errors is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to oil well workover equipment technical field, and specifically relates to a tubing fall arrestor. BACKGROUND

[0002] In the process of well repairing, the oil pipe needs to be taken out from the well, and the oil pipe is easy to fall into the well bottom after breaking off in the process of lifting the oil pipe. Since the oil pipe is connected with various downhole tools, the high-speed falling of the oil pipe into the well bottom can cause damage to the oil pipe and downhole tools, and can also cause damage to the wellbore of the oil-water well, resulting in the abandonment of the oil well and causing significant economic losses.

[0003] In order to prevent the oil pipe from falling into the well bottom after breaking off, some devices exist on the market to prevent the oil pipe from falling into the well bottom after breaking off, such as a fall-preventing release hand. The fall-preventing release hand is arranged 10-20 m below the production pipe column, so that the oil pipe only falls 10-20 m after breaking off and stops falling, which can reduce tool damage and reduce fishing difficulty. Although this method can prevent the broken pipe column from falling into the well bottom, it is necessary to drill the fall-preventing release hand into the well in advance, and a separate pipe column for drilling the fall-preventing release hand needs to be lowered. After drilling the fall-preventing release hand, the pipe column for drilling the fall-preventing release hand is lifted out, and then the production pipe column is lowered for production. When the next operation needs to change the layer or change the tool lowering depth, the fall-preventing release hand pipe column needs to be lowered again to fish out the fall-preventing release hand, and then the fall-preventing release hand of the required depth needs to be drilled again. Therefore, the fall-preventing release hand operation has many procedures and long construction time, which affects the well repairing efficiency. SUMMARY

[0004] The utility model wants to overcome the technical problems of prior art, and provides a tubing fall arrestor which is reasonable in design, high in construction efficiency and simple in structure.

[0005] The technical scheme adopted to solve the above technical problems is as follows: a tubing fall arrestor, an oil pipe hole is arranged at the bottom center of an oil cylinder shell, a taper sleeve is fixedly arranged in the oil cylinder shell, a sealed cavity is formed between the taper sleeve and the side wall of the oil cylinder shell, a piston sleeve is arranged in the sealed cavity, the piston sleeve divides the sealed cavity into an upper pressure cavity and a lower pressure cavity, an upper fluid connector and a lower fluid connector are arranged on the side wall of the oil cylinder shell corresponding to the upper pressure cavity and the lower pressure cavity, a tapered fall-preventing frame is sleeved in the taper sleeve, the upper end of the piston sleeve abuts against the bottom surface of the upper edge of the fall-preventing frame, and fall-preventing rollers are evenly distributed on the fall-preventing frame in the circumferential direction.

[0006] As a preferred technical scheme, four arc-shaped clamping blocks are arranged on the upper end surface of the taper sleeve in the circumferential direction, the upper edge of the fall-preventing frame is composed of four radially connected blocks, and the connected blocks are clamped in the gap between the adjacent two arc-shaped clamping blocks.

[0007] As a preferred technical scheme, the oil cylinder outer shell is provided with an oil cylinder outer sleeve on the oil cylinder seat, and the top of the oil cylinder outer sleeve is provided with an annular cover plate.

[0008] As a preferred technical scheme, the conical frame body is processed with uniformly distributed roller mounting grooves with axis downwardly inclined, the roller mounting grooves are provided with positioning grooves at both ends of the roller grooves, the roller grooves are through grooves, and one end of the positioning grooves close to the center is closed and the other end is open.

[0009] The utility model discloses the beneficial effects are as follows:

[0010] The utility model discloses the beneficial effects are as follows:

[0011] The utility model discloses the beneficial effects are as follows: BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is the structural schematic diagram of the utility model.

[0013] Figure 2 It is Figure 1 The structural schematic diagram of the conical frame body.

[0014] Figure 3 It is Figure 2 The top view of

[0015] Figure 4 It is Figure 2 The A-A section view of

[0016] Among them: oil cylinder seat 1-1, oil cylinder outer sleeve 1-2, annular cover plate 1-3, conical sleeve 2, piston sleeve 3, conical frame body 4, positioning groove 4-1, roller groove 4-2, radial connecting block 4-3, upper fluid connector 5, upper pressure chamber 6, roller 7, lower fluid connector 8, lower pressure chamber 9, oil pipe 10. DETAILED DESCRIPTION

[0017] The utility model will be further explained in detail in combination with the drawings and examples, but the utility model is not limited to the following implementation.

[0018] In Figure 1 , 2In the oil pipe anti-falling device, the bottom center of the oil cylinder shell is processed with an oil pipe hole, the oil cylinder shell is fixed and installed with a taper sleeve 2 inside by a threaded fastener, a sealed cavity is formed between the taper sleeve 2 and the side wall of the oil cylinder shell, a piston sleeve 3 is installed in the sealed cavity, the piston sleeve 3 divides the sealed cavity into an upper pressure cavity 6 and a lower pressure cavity 9, the side wall of the oil cylinder shell corresponding to the upper pressure cavity 6 and the lower pressure cavity 9 is respectively provided with an upper fluid connector 5 and a lower fluid connector 8, a taper anti-falling frame is sleeved in the taper sleeve 2, four evenly distributed arc-shaped clamping blocks are circumferentially arranged on the upper end surface of the taper sleeve 2, the upper edge of the anti-falling frame is formed by four evenly distributed radial connecting blocks 4-3, the radial connecting blocks 4-3 are clamped in the gap between adjacent two arc-shaped clamping blocks, and the upper end of the piston sleeve 3 abuts against the bottom surface of the upper edge of the anti-falling frame. The upper fluid connector 5 and the lower fluid connector 8 are connected with a fluid pressure source, when fluid enters the upper pressure cavity 6 from the upper fluid connector 5, the piston sleeve 3 moves downwards, so that the anti-falling frame moves downwards, and when fluid enters the lower pressure cavity 9 from the lower fluid connector 8, the piston sleeve 3 moves upwards, so that the anti-falling frame moves upwards.

[0019] The anti-falling frame comprises a taper frame body 4 and a roller 7, the taper frame body 4 is processed with roller mounting grooves which are inclined downward along the axis and are evenly distributed, the roller mounting grooves are provided with positioning grooves 4-1 at two ends of a roller groove 4-2, the roller groove 4-2 is a through groove, one end of the positioning groove 4-1 close to the center is closed, and the other end is open, and the roller 7 is matched and installed in the roller mounting groove 4-2. In the process of moving downwards, the roller 7 is extruded by the taper sleeve 2, and the roller 7 is locked to the oil pipe by gathering to the center of the anti-falling frame, in the process of moving upwards, the roller 7 moves away from the center of the anti-falling frame, so that the oil pipe is loosened.

[0020] The oil cylinder shell comprises an oil cylinder seat 1-1, an oil cylinder outer sleeve 1-2 and an annular cover plate 1-3, the oil cylinder seat 1-1 is provided with the oil cylinder outer sleeve 1-2, the top of the oil cylinder outer sleeve 1-2 is provided with the annular cover plate 1-3, the bottom of the taper sleeve 2 is fixed on the oil cylinder seat 1-1, and the upper end is fixed on the annular cover plate 1-3.

[0021] In use, the oil pipe anti-falling device is installed on the well mouth, the oil pipe 10 passes through the oil pipe anti-falling device, the upper fluid connector 5 and the lower fluid connector 8 are connected with the fluid pressure source, and the oil pipe 10 is locked or loosened under the driving of the fluid pressure source, so that automatic control can be realized, and linkage with a workover rig is facilitated.

Claims

1. A tubing anti-fall device, characterized by: An oil pipe hole is provided at the center of the bottom of the oil cylinder outer shell, and a tapered sleeve is fixedly provided in the oil cylinder outer shell, and a sealed chamber is formed between the tapered sleeve and the side wall of the oil cylinder outer shell, and a piston sleeve is provided in the sealed chamber, which divides the sealed chamber into an upper pressure chamber and a lower pressure chamber. An upper fluid joint and a lower fluid joint are respectively provided on the side walls of the oil cylinder outer shell opposite to the upper pressure chamber and the lower pressure chamber, and a conical anti-drop frame is installed in the tapered sleeve, and the upper end of the piston sleeve rests on the bottom surface of the upper edge of the anti-drop frame. Anti-drop rollers are evenly distributed on the upper circumference of the anti-drop frame.

2. The oil pipe anti-fall device according to claim 1, characterized in that: Four evenly distributed arc-shaped blocks are circumferentially arranged on the upper end surface of the cone sleeve, and the upper edge of the anti-fall frame is composed of four evenly distributed radial connecting blocks, which are stuck in the gap between two adjacent arc-shaped blocks.

3. The oil pipe anti-fall device according to claim 1, characterized in that: The oil cylinder outer shell is a cylinder seat on which an oil cylinder jacket is arranged, and an annular cover plate is arranged on the top of the oil cylinder jacket.

4. The oil pipe anti-fall device according to claim 1, characterized in that: The anti-fall frame is as follows: a conical frame body is processed with evenly distributed roller mounting grooves with downwardly inclined axes, the roller mounting grooves are provided with positioning grooves at both ends of the roller grooves, the roller grooves are through grooves, and the positioning grooves are closed at one end close to the center and open at the other end.

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