Blowout preventer for breakage and falling of oil well polish rod

Abstract

The utility model belongs to the technical field of oil well protection devices, and discloses an oil well polish rod breakage blowout preventer. The sleeve is mainly technically characterized by comprising a sleeve body which is provided with an upper sleeve and a lower sleeve oppositely, a polish rod channel is formed among the upper sleeve, the lower sleeve and the sleeve body, a front end cover is arranged in front of the sleeve body, a rear end cover is arranged behind the sleeve body, and a horizontal moving block is arranged in the sleeve body. A blocking groove is formed in the upper portion of the horizontal moving block, a vertical jacking spring is arranged in the blocking groove, a blocking plug is arranged at the upper end of the vertical jacking spring, a transverse jacking spring is arranged between the rear end cover and the horizontal moving block, a pulley groove is formed in front of the horizontal moving block, and a pulley is arranged in the pulley groove. When the polish rod moves up and down, the pulley rotates, the friction force between the polish rod and the pulley is reduced, the service life of the blowout preventer for the broken and disengaged polish rod of the oil well is prolonged, only the pulley needs to be replaced after the pulley is abraded, and the material cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of oil well protection devices, in particular to an oil well polished rod breakage and blowout prevention device. Background Art

[0002] During the operation of the oil well, the polished rod may break during the up and down movement. When the polished rod breaks, the oil in the oil well will come out of the wellbore. In order to prevent the oil from coming out of the wellbore after the polished rod breaks, a polished rod breakage and blowout prevention device is arranged above the oil well sealing device. The currently used oil well polished rod breakage and blowout prevention device includes a sleeve body with an upper casing and a lower casing arranged relatively to each other, the upper casing and the lower casing are internally connected, a front end cover is arranged in front of the sleeve body, a rear end cover is arranged behind the sleeve body, a horizontal moving block is arranged in the sleeve body, a blocking groove is arranged above the horizontal moving block, a vertical top spring is arranged in the blocking groove, a sealing plug is arranged at the upper end of the vertical top spring, and a transverse top spring is arranged between the rear end cover and the horizontal moving block. When the polished rod breaks or comes out, the transverse top spring pushes the horizontal moving block forward, and when the sealing plug is aligned with the upper casing, the vertical top spring pushes up, and the sealing plug is always on the upper casing to achieve blocking. The above-mentioned oil well polished rod breakage and blowout prevention device has the following defects: first, because the polished rod reciprocates up and down in the sleeve body, the transverse top spring presses the side of the horizontal moving block against the side of the polished rod. In the process of the polished rod moving up and down, the horizontal moving block and the polished rod rub against each other, and the horizontal moving block wears along. It is necessary to replace the horizontal moving block frequently, which reduces the oil production efficiency, and the whole horizontal moving block needs to be replaced, which increases the oil production cost; second, during use, when the horizontal moving block and the sleeve body move laterally, the horizontal moving block cannot be blocked immediately due to the large resistance between the horizontal moving block and the sleeve body, resulting in an oil leakage accident. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide an oil well polished rod breakage and blowout prevention device which has the advantages of long service life, high oil production efficiency, good plugging effect and safe use.

[0004] In order to solve the above problems, the technical solution adopted by the utility model oil well polished rod breakage and blowout prevention device is:

[0005] It includes a sleeve body with an upper sleeve and a lower sleeve arranged relatively to each other, a light rod channel is formed between the upper sleeve, the lower sleeve and the sleeve body, a front end cover is arranged in front of the sleeve body, a rear end cover is arranged behind the sleeve body, a horizontal moving block is arranged in the sleeve body, a blocking groove is arranged above the horizontal moving block, a vertical top spring is arranged in the blocking groove, a sealing block is arranged at the upper end of the vertical top spring, a transverse top spring is arranged between the rear end cover and the horizontal moving block, a pulley groove is arranged in front of the horizontal moving block, and a pulley is arranged in the pulley groove.

[0006] Its additional technical features are:

[0007] The horizontal moving block comprises a moving block head and a moving block body, a limiting collar is arranged near the rear of the moving block body, the transverse top spring is sleeved on the moving block body between the moving block head and the limiting collar, the rear of the limiting collar presses against the front end of the rear end cover, and the rear end cover is provided with a moving block body cavity;

[0008] The sealing plug comprises a cylindrical plug body and a conical plug head;

[0009] A ball groove is arranged on the top of the plug head, and a ball is arranged in the ball groove.

[0010] Compared with the prior art, the oil well polished rod breakage and blowout prevention device provided by the utility model has the following advantages: first, since it includes a sleeve body comprising an upper casing and a lower casing relatively arranged, a polished rod channel is formed between the upper casing, the lower casing and the sleeve body, a front end cover is arranged in front of the sleeve body, a rear end cover is arranged behind the sleeve body, a horizontal moving block is arranged in the sleeve body, a blocking groove is arranged above the horizontal moving block, a vertical top spring is arranged in the blocking groove, a sealing plug is arranged at the upper end of the vertical top spring, a transverse top spring is arranged between the rear end cover and the horizontal moving block, a pulley groove is arranged in front of the horizontal moving block, and a pulley is arranged in the pulley groove. During the up and down movement of the polished rod, the pulley rotates, thereby reducing the friction between the polished rod and the pulley, improving the oil well polished rod breakage and blowout prevention device. The service life of the oil well bare rod breakage and blowout prevention device is prolonged. When the pulley is worn, only the pulley needs to be replaced, and the material cost is reduced. Secondly, since the horizontal moving block includes a moving block head and a moving block body, a limiting collar is arranged near the rear of the moving block, and the transverse top spring is sleeved on the moving block body between the moving block head and the limiting collar, and the rear of the limiting collar is pressed against the front end of the rear end cover, and the rear end cover is provided with a moving block body cavity, so that the horizontal moving block moves quickly and has a good sealing effect. Thirdly, since the sealing plug includes a cylindrical plug body and a conical plug head, even if the position of the sealing plug deviates, effective sealing can be achieved and the sealing effect is good. Fourthly, since a ball groove is arranged on the top of the plug head and a ball is arranged in the ball groove, the lateral movement resistance of the horizontal moving block is small. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of the oil well polished rod breakage and blowout prevention device of the utility model;

[0012] Figure 2 It is a structural schematic diagram of the oil well polished rod break-off blowout prevention device after the oil well polished rod is broken off;

[0013] Figure 3It is a structural schematic diagram of a polished rod break-off blowout prevention device for an oil well with a polished rod;

[0014] Figure 4 Schematic diagram of the structure of the sealing plug. DETAILED DESCRIPTION

[0015] The structure and use principle of the oil well polished rod breakage and blowout prevention device of the utility model are further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0016] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the structural schematic diagram of the oil well polished rod breakage and blowout prevention device of the utility model, the oil well polished rod breakage and blowout prevention device of the utility model comprises a sleeve body 3 with an upper casing 1 and a lower casing 2 arranged relatively, a polished rod channel 4 is formed between the upper casing 1, the lower casing 2 and the sleeve body 3, a front end cover 5 is arranged in front of the sleeve body 3, and a rear end cover 6 is arranged behind the sleeve body 3. A horizontal moving block 7 is arranged in the sleeve body 3, a blocking groove 71 is arranged above the horizontal moving block 7, a vertical top spring 8 is arranged in the blocking groove 71, a sealing plug 9 is arranged at the upper end of the vertical top spring 8, and a transverse top spring 10 is arranged between the rear end cover 6 and the horizontal moving block 7. A pulley groove 72 is arranged in front of the horizontal moving block 7, and a pulley 73 is arranged in the pulley groove 72. During the upward and downward movement of the polished rod 11, the pulley 73 rotates, which reduces the friction between the polished rod and the pulley, thereby increasing the service life of the oil well polished rod breakage blowout prevention device. When the pulley is worn, only the pulley needs to be replaced, thereby reducing the material cost.

[0017] The horizontal moving block 7 includes a moving block head 74 and a moving block body 75. A limiting collar 76 is arranged near the rear of the moving block body 75. The transverse top spring 10 is sleeved on the moving block body 75 between the moving block head 74 and the limiting collar 76. The rear of the limiting collar 76 is pressed against the front end of the rear end cover 6. The rear end cover 6 is provided with a moving block body cavity 61. In this way, the horizontal moving block moves quickly and has a good blocking effect.

[0018] The sealing plug 9 comprises a cylindrical plug body 91 and a conical plug head 92. Even if the position of the sealing plug deviates, effective sealing can be achieved, and the sealing effect is good.

[0019] A ball groove 93 is arranged on the top of the plug head 92, and a ball 94 is arranged in the ball groove 93, so that the horizontal moving block has a small resistance to lateral movement.

[0020] The protection scope of the present utility model is not limited to the above-mentioned embodiments. As long as the structure is the same or similar to the oil well polished rod breakage prevention device of the present utility model, it falls within the protection scope of the present utility model.

Claims

1. An oil well polished rod breakage prevention device, comprising a sleeve body with an upper casing and a lower casing arranged relatively to each other, a polished rod channel formed between the upper casing, the lower casing and the sleeve body, a front end cover arranged in front of the sleeve body, a rear end cover arranged behind the sleeve body, a horizontal moving block arranged in the sleeve body, a blocking groove arranged above the horizontal moving block, a vertical top spring arranged in the blocking groove, a sealing plug arranged at the upper end of the vertical top spring, and a transverse top spring arranged between the rear end cover and the horizontal moving block, characterized in that: A pulley groove is arranged in front of the horizontal moving block, a pulley is arranged in the pulley groove, the horizontal moving block includes a moving block head and a moving block body, a limiting collar is arranged near the rear of the moving block body, the transverse top spring is sleeved on the moving block body between the moving block head and the limiting collar, the rear of the limiting collar is pressed against the front end of the rear end cover, and the rear end cover is provided with a moving block body cavity.

2. The oil well polished rod breakage prevention device according to claim 1, characterized in that: The sealing plug comprises a cylindrical plug body and a conical plug head.

3. The oil well polished rod breakage prevention device according to claim 2, characterized in that: A ball groove is arranged on the top of the plug head, and a ball is arranged in the ball groove.

Images