Rapid locking mechanism for blowout preventer at wellhead of oil field

Abstract

The utility model discloses a quick locking mechanism for an oil field wellhead blowout preventer, and relates to the technical field of locking mechanisms. The rapid locking mechanism of the oil field wellhead blowout preventer comprises an oil field wellhead blowout preventer body, inner threaded pipes are arranged on the surfaces of the two sides of the oil field wellhead blowout preventer body, and the inner walls of the two inner threaded pipes are in threaded connection with threaded rods; the locking assembly comprises a fixing cylinder which is fixedly arranged on the surface of the oil field wellhead blowout preventer body and corresponds to the threaded rod, and an annular cavity is formed in a cylinder body of the fixing cylinder. According to the oil field wellhead blowout preventer, the locking assembly is arranged, after the oil field wellhead blowout preventer achieves blowout prevention by rotating the rotating rudder, the rotating column can be rotated, the arc-shaped toothed plate is driven to be close to the fluted disc and meshed with the fluted disc, effective braking and locking of the threaded rod are achieved, and then effective locking of the oil field wellhead blowout preventer body is achieved; and the stability of the blowout preventer body at the wellhead of the oil field during blowout prevention is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to locking mechanism technical field, concretely is oilfield wellhead blowout preventer quick locking mechanism. BACKGROUND

[0002] The blowout preventer is used for closing the wellhead in the operation process such as oil testing, well repairing and well completion, preventing the blowout accident, combining the full sealing and half sealing functions into one, and has the characteristics of simple structure, easy operation, high pressure resistance and the like, and is a commonly used safety sealing wellhead device for preventing blowout in oilfields.

[0003] In the prior art, the patent with the publication number CN214221139U discloses a gate blowout preventer for oilfield wellhead, which comprises a rectangular shell, an adjusting screw, a wheel disc, a blowout pipe, a first butt joint disc, a fastening screw, a second butt joint disc, a butt joint hole, a limiting groove, a gasket, an observation window, a sealing plate and a bearing. The utility model has the beneficial effects that the adjusting screw is threadedly connected with the rectangular shell, the sealing plate is slidably connected in the internal cavity of the rectangular shell through the adjusting screw, the staff can rotate the adjusting screw to quickly control the left and right movement of the sealing plate, and thus the sealing degree of the gate blowout preventer for the oilfield wellhead is controlled, the wheel disc is in the form of a disc, and a layer of anti-skid rubber is glued on the outer surface of the wheel disc to increase the friction between the palm of the staff and the wheel disc, prevent slipping, and increase the comfort when the staff holds the wheel disc.

[0004] The technical solution of the above-mentioned patent technology lacks a corresponding locking mechanism after preventing blowout by rotating the wheel disc in practice, so that locking is only realized by relying on the screw and the screw hole, and when the wheel disc is subjected to external collision or force, the sealing plate is easily moved back, thereby causing leakage. In view of this, the present application provides a quick locking mechanism for an oilfield wellhead blowout preventer. SUMMARY

[0005] In view of the deficiencies of the prior art, the utility model provides a quick locking mechanism for an oilfield wellhead blowout preventer, which solves the problem of poor stability of the blowout preventer during blowout prevention in the background art.

[0006] To achieve the above-mentioned purposes, the utility model realizes the following technical scheme: a quick locking mechanism for an oilfield wellhead blowout preventer, comprising:

[0007] An oilfield wellhead blowout preventer body is provided with an inner threaded pipe on both side surfaces, an inner wall of each of the two inner threaded pipes is threadedly connected with a threaded rod, and an end of the threaded rod is fixedly provided with a rotating rudder;

[0008] The locking assembly is used for locking and braking the threaded rod, and comprises a fixed cylinder fixed on the surface of the blowout preventer body of the oil field well head and corresponding to the threaded rod, an annular cavity is formed in the inner wall of the fixed cylinder, and a telescopic pipe is slidably arranged on the inner wall of the annular cavity, a limiting ring is fixed on the end inner wall of the annular cavity, the end inner wall of the telescopic pipe is rotatably connected with the surface of the rotating rudder through a bearing, the locking assembly further comprises a hollow ring fixed on the surface of the telescopic pipe, and a toothed disc fixed on the surface of the threaded rod and corresponding to the hollow ring, an arc-shaped toothed plate corresponding to the toothed disc is slidably arranged on the inner ring surface of the hollow ring, and a rotating column for driving the arc-shaped toothed plate to move is arranged on the outer surface of the hollow ring.

[0009] Preferably, a rectangular hole is formed in the inner wall of the hollow ring, and a rectangular telescopic column is slidably arranged on the inner wall of the rectangular hole, the end of the rectangular telescopic column extends to the inner ring surface of the hollow ring, and the outer arc surface of the arc-shaped toothed plate is fixedly connected with the end of the rectangular telescopic column.

[0010] Preferably, a threaded column extending to the outer surface of the hollow ring is rotatably arranged on the inner wall of the hollow ring, a columnar threaded groove threadedly connected with the outer surface of the threaded column is formed in the end of the rectangular telescopic column, and the rotating column is fixedly arranged on the top end of the threaded column.

[0011] Preferably, four limiting rods are circumferentially arranged on the surface of the limiting ring, a limiting block is fixedly arranged on the end outer surface of the telescopic pipe, and a through hole slidably connected with the surface of the limiting rod is formed in the surface of the limiting block.

[0012] Preferably, a telescopic air bag is fixedly arranged on the inner wall of the hollow ring, a pressing plate is fixedly arranged on the end outer surface of the rectangular telescopic column, the surface of the pressing plate is fixedly connected with the telescopic end of the telescopic air bag, and a reset spring is arranged in the telescopic air bag.

[0013] Preferably, a connecting box extending to the inside of the telescopic pipe is embedded on the outer surface of the telescopic pipe, and a locking block corresponding to the limiting ring is slidably arranged on the inner wall of the connecting box.

[0014] Preferably, an expansion air bag column is fixedly arranged on the inner bottom wall of the connecting box, the top end of the expansion air bag column is fixedly connected with the surface of the locking block, and a connecting pipe in communication with the expansion air bag column is arranged on the end of the telescopic air bag. Beneficial effects

[0015] Compared with the prior art, the oil field well head blowout preventer quick locking mechanism has the following beneficial effects:

[0016] The quick locking mechanism of the oil field wellhead blowout preventer can rotate the rotating column to drive the arc-shaped toothed plate to be close to the toothed disc and be interlocked with the toothed disc after the oil field wellhead blowout preventer is prevented from blowing out by rotating the rudder, effective braking and locking of the threaded rod are realized, and then effective locking of the oil field wellhead blowout preventer body is realized, the stability of the oil field wellhead blowout preventer body during blowout prevention is ensured, meanwhile, the locking block can be driven to move out of the connecting box and effectively limit the telescopic pipe under the action of the limiting ring, and the stability of the oil field wellhead blowout preventer body during blowout prevention is further ensured. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a three-dimensional structure schematic diagram of the utility model;

[0018] Figure 2 It is a sectional structure schematic diagram of the utility model;

[0019] Figure 3 It is a three-dimensional structure schematic diagram of the utility model Figure 2 It is an enlarged structure schematic diagram of A in the utility model;

[0020] Figure 4 It is an enlarged structure schematic diagram of B in the utility model Figure 2

[0021] In the drawing:

[0022] 100, oil field wellhead blowout preventer body; 101, inner threaded pipe; 102, threaded rod; 103, rotating rudder;

[0023] 200, locking assembly; 201, fixed cylinder; 202, annular cavity; 203, telescopic pipe; 204, hollow ring; 205, toothed disc; 206, arc-shaped toothed plate; 207, rotating column; 208, rectangular telescopic column; 209, threaded column; 2010, cylindrical threaded groove; 2011, limiting rod; 2012, limiting block; 2013, telescopic air bag; 2014, pressing plate; 2015, connecting box; 2016, locking block; 2017, expansion air bag column; 2018, connecting pipe; 2019, limiting ring; 2020, reset spring. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0025] Please refer to Figure 1 - Figure 4 ​The utility model provides a technical scheme: oilfield wellhead blowout preventer quick locking mechanism, include:

[0026] Oilfield wellhead blowout preventer body 100, both sides surface of oilfield wellhead blowout preventer body 100 all are provided with internal thread pipe 101, the inner wall of two internal thread pipes 101 all are threadedly connected with threaded rod 102, and the end of threaded rod 102 is fixed with rotating rudder 103;

[0027] Locking assembly 200 is used for locking brake to threaded rod 102, locking assembly 200 includes fixed cylinder 201 that is fixed in the surface of oilfield wellhead blowout preventer body 100 and corresponds with threaded rod 102, the cylindrical body inside of fixed cylinder 201 is opened with annular cavity 202, and the inner wall of annular cavity 202 is slidably provided with telescopic pipe 203, the end inner wall of annular cavity 202 is fixed with limit ring 2019, the end inner wall of telescopic pipe 203 is rotatably connected with the surface of rotating rudder 103 through bearing, locking assembly 200 still includes hollow ring 204 that is fixed in the surface of telescopic pipe 203, and tooth disc 205 that is fixed in the surface of threaded rod 102 and corresponds with hollow ring 204, the inner ring surface of hollow ring 204 is slidably provided with arc-shaped toothed plate 206 corresponding with tooth disc 205, and the outer surface of hollow ring 204 is provided with rotating column 207 for driving arc-shaped toothed plate 206 moves.

[0028] Referring to Figure 2 And Figure 3 The inner wall of hollow ring 204 is opened with rectangular hole, and the inner wall of rectangular hole is slidably provided with rectangular telescopic column 208, the end of rectangular telescopic column 208 extends to the inner ring surface of hollow ring 204, and the outer arc surface of arc-shaped toothed plate 206 is fixedly connected with the end of rectangular telescopic column 208.

[0029] Specifically, by setting rectangular telescopic column 208, arc-shaped toothed plate 206 can be driven to automatically approach or move away from tooth disc 205 by the movement of rectangular telescopic column 208.

[0030] Referring to Figure 2 And Figure 3 The inner wall of hollow ring 204 is rotatably provided with threaded column 209 extending to the outer surface of hollow ring 204, and the end of rectangular telescopic column 208 is provided with cylindrical thread groove 2010 threadedly connected with the outer surface of threaded column 209, and rotating column 207 is fixedly arranged at the top end of threaded column 209.

[0031] Specifically, by setting cylindrical thread groove 2010, rectangular telescopic column 208 can be automatically moved by the rotation of threaded column 209.

[0032] The utility model discloses a locking assembly 200 is set, when oilfield wellhead blowout preventer realizes the blowout prevention through the rotation of the steering oar 103, can rotate the rotating column 207, the rotation of rotating column 207 drives the threaded column 209 rotation, the threaded column 209 rotation is under the action of cylindrical thread groove 2010 drives rectangular telescopic column 208 moves to drive arc toothed plate 206 close toothed disc 205 and with toothed disc 205 interlock, realize the effective brake locking of threaded rod 102, and then realize the effective locking of oilfield wellhead blowout preventer body 100, guarantee the stability of oilfield wellhead blowout preventer body 100 blowout.

[0033] Referring to Figure 2 And Figure 4 The surface of the limiting ring 2019 is circumferentially arranged with four limiting rods 2011, and the end surface of the telescopic tube 203 is fixedly provided with a limiting block 2012, and the surface of the limiting block 2012 is provided with a through hole in sliding connection with the surface of the limiting rod 2011.

[0034] Specifically, by arranging the limiting block 2012 and the limiting rod 2011, the telescopic tube 203 can be prevented from rotating together with the steering oar 103 during rotation.

[0035] Referring to Figure 3 The inner wall of the hollow ring 204 is fixedly provided with a telescopic air bag 2013, the end surface of the rectangular telescopic column 208 is fixedly provided with a pressing plate 2014, the surface of the pressing plate 2014 is fixedly connected with the telescopic end of the telescopic air bag 2013, and the inside of the telescopic air bag 2013 is provided with a reset spring 2020.

[0036] Specifically, by arranging the pressing plate 2014 and the reset spring 2020, the telescopic air bag 2013 can be squeezed by the movement of the rectangular telescopic column 208, and the telescopic air bag 2013 can be easily reset under the action of the reset spring 2020.

[0037] Referring to Figure 3 The outer surface of the telescopic tube 203 is embedded with a connecting box 2015 extending into the inside of the telescopic tube 203, and the inner wall of the connecting box 2015 is slidingly provided with a locking block 2016 corresponding to the limiting ring 2019.

[0038] Specifically, by arranging the locking block 2016, the telescopic tube 203 can be effectively limited by the extension of the locking block 2016.

[0039] Referring to Figure 3 The inner bottom wall of the connecting box 2015 is fixedly provided with an inflatable air bag column 2017, the top end of the inflatable air bag column 2017 is fixedly connected with the surface of the locking block 2016, and the end of the telescopic air bag 2013 is provided with a connecting pipe 2018 in communication with the inflatable air bag column 2017.

[0040] Specifically, by setting the connecting pipe 2018, when the telescopic air bag 2013 is squeezed, the air flow can be delivered to the inside of the inflatable air bag column 2017 through the connecting pipe 2018.

[0041] In the process of rotating the screw rod 102 driven by the rotating rudder 103, the screw rod 102 can gradually enter the inside of the oilfield wellhead blowout preventer body 100, at this time, the telescopic pipe 203 can move in the annular cavity 202 on the fixed cylinder 201, when the locking block 2016 passes through the limiting ring 2019 and enters the inside of the annular cavity 202, and then the rotating column 207 is rotated to realize effective locking of the oilfield wellhead blowout preventer body 100, in the process of moving the rectangular telescopic column 208, the telescopic air bag 2013 can be squeezed by the pressing plate 2014, so that the gas in the telescopic air bag 2013 enters the inside of the inflatable air bag column 2017 through the connecting pipe 2018, the inflatable air bag column 2017 is inflated, so as to drive the locking block 2016 to move out of the connecting box 2015, and the telescopic pipe 203 is effectively limited under the action of the limiting ring 2019, thereby further ensuring the stability of the oilfield wellhead blowout preventer body 100 when preventing blowout.

[0042] Working principle: when the oilfield wellhead blowout preventer realizes blowout prevention by rotating the rotating rudder 103, the rotating column 207 can be rotated, the rotation of the rotating column 207 drives the rotation of the threaded column 209, the rotation of the threaded column 209 drives the movement of the rectangular telescopic column 208 under the action of the cylindrical threaded groove 2010, so as to drive the arc-shaped toothed plate 206 to approach the toothed disc 205 and mesh with each other, realize effective brake locking of the screw rod 102, and further realize effective locking of the oilfield wellhead blowout preventer body 100, thereby ensuring the stability of the oilfield wellhead blowout preventer body 100 when preventing blowout, and in the process of rotating the screw rod 102 driven by the rotating rudder 103, the screw rod 102 can gradually enter the inside of the oilfield wellhead blowout preventer body 100, at this time, the telescopic pipe 203 can move in the annular cavity 202 on the fixed cylinder 201, when the locking block 2016 passes through the limiting ring 2019 and enters the inside of the annular cavity 202, and then the rotating column 207 is rotated to realize effective locking of the oilfield wellhead blowout preventer body 100, in the process of moving the rectangular telescopic column 208, the telescopic air bag 2013 can be squeezed by the pressing plate 2014, so that the gas in the telescopic air bag 2013 enters the inside of the inflatable air bag column 2017 through the connecting pipe 2018, the inflatable air bag column 2017 is inflated, so as to drive the locking block 2016 to move out of the connecting box 2015, and the telescopic pipe 203 is effectively limited under the action of the limiting ring 2019, thereby further ensuring the stability of the oilfield wellhead blowout preventer body 100 when preventing blowout.

[0043] Also, any format not described in detail herein is considered to be conventional and well known by those skilled in the art.

Claims

1. A quick locking mechanism for blowout preventer of oilfield wellhead, characterized in that, The utility model relates to an oilfield wellhead blowout preventer body (100) is provided with the internal thread pipe (101) on both sides surface, and the inner wall of two internal thread pipes (101) is threadedly connected with the threaded rod (102), and the end of threaded rod (102) is fixedly provided with the rotating rudder (103), and the utility model relates to a locking assembly (200) for locking and braking threaded rod (102), locking assembly (200) includes the fixed cylinder (201) of being fixed on the surface of oilfield wellhead blowout preventer body (100) and corresponding with threaded rod (102), the cylindrical body inside of fixed cylinder (201) is provided with annular cavity (202), and the inner wall of annular cavity (202) is slidably provided with telescopic pipe (203), the end inner wall of annular cavity (202) is fixedly provided with the limit ring (2019), the end inner wall of telescopic pipe (203) is rotatably connected with the surface of rotating rudder (103) through bearing, locking assembly (200) still includes the hollow ring (204) of being fixed on the surface of telescopic pipe (203) and the tooth disc (205) of being fixed on the surface of threaded rod (102) and corresponding with hollow ring (204), the inner ring surface of hollow ring (204) is slidably provided with the arc-shaped toothed plate (206) corresponding with tooth disc (205), and the outer surface of hollow ring (204) is provided with the rotating column (207) for driving arc-shaped toothed plate (206) moves. The inner wall of the hollow ring (204) is provided with a rectangular hole, and the inner wall of the rectangular hole is slidably provided with a rectangular telescopic column (208), the end of the rectangular telescopic column (208) extends to the inner ring surface of the hollow ring (204), and the outer arc surface of the arc-shaped toothed plate (206) is fixedly connected with the end of the rectangular telescopic column (208). The inner wall of the hollow ring (204) is rotatably provided with a threaded column (209) extending to the outer surface of the hollow ring (204), and the end of the rectangular telescopic column (208) is provided with a cylindrical threaded groove (2010) threadedly connected with the outer surface of the threaded column (209), and the rotating column (207) is fixedly provided on the top end of the threaded column (209).

2. The quick locking mechanism of the blowout preventer of an oilfield wellhead according to claim 1, characterized in that: The surface of the limit ring (2019) is circumferentially provided with four limit rods (2011), the end outer surface of the telescopic pipe (203) is fixedly provided with a limit block (2012), and the surface of the limit block (2012) is provided with a through hole slidably connected with the surface of the limit rod (2011).

3. The quick locking mechanism of the blowout preventer of an oilfield wellhead according to claim 2, characterized in that: The inner wall of the hollow ring (204) is fixedly provided with a telescopic air bag (2013), the end outer surface of the rectangular telescopic column (208) is fixedly provided with a pressing plate (2014), the surface of the pressing plate (2014) is fixedly connected with the telescopic end of the telescopic air bag (2013), and the inside of the telescopic air bag (2013) is provided with a reset spring (2020).

4. The quick locking mechanism of the oilfield wellhead blowout preventer according to claim 1, characterized in that: The outer surface of the telescopic pipe (203) is embedded with a connecting box (2015) extending into the inside of the telescopic pipe (203), the inner wall of the connecting box (2015) is slidably provided with a locking block (2016) corresponding with the limit ring (2019).

5. The quick locking mechanism of the oilfield wellhead blowout preventer according to claim 3, characterized in that: ​ 6. The quick locking mechanism of the oilfield wellhead blowout preventer according to claim 5, characterized in that: ​ 7. The quick locking mechanism of the oilfield wellhead blowout preventer according to claim 6, characterized in that: The inner bottom wall of the connecting box (2015) is fixed with an inflation air bag column (2017), the top end of the inflation air bag column (2017) is fixedly connected with the surface of the locking block (2016), and the end of the telescopic air bag (2013) is provided with a connecting pipe (2018) in communication with the inflation air bag column (2017).

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