Blowout preventer for well drilling and workover in oil field

Abstract

The utility model relates to the technical field of workover treatment, in particular to a blowout preventer for well drilling and workover in an oil field. The blowout preventer for well drilling and workover in the oil field comprises an inserting cylinder, an arc-shaped rubber seat with an arc opening contracting upwards is fixedly embedded in a cylinder opening in the bottom of the inserting cylinder, and a cylinder opening in the top of the inserting cylinder is of a conical cavity structure with a conical head facing upwards and is fixedly provided with blowout prevention tanks communicating with each other; and an oil blocking component is arranged in the inserting cylinder. According to the blowout preventer for well drilling and workover in the oil field, when well blowout occurs, high-pressure liquid pushes the semicircular sealing ball to slide upwards, the semicircular sealing ball is attached to the arc-shaped rubber base with the arc opening contracting upwards, and therefore primary sealing is formed, the oil spraying amount can be greatly reduced, meanwhile, the middle connecting rod drives the conical piston to slide upwards, and the oil spraying amount is reduced. And the conical cavity is sealed by the conical piston, so that secondary sealing is realized, oil liquid is further prevented from being sprayed out, and the condition of oil liquid leakage during well spraying is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of well repair operations, in particular to a blowout preventer for oil field well drilling and repair. Background Art

[0002] Well repair operation refers to an operation of oil drilling and subsequent oil well maintenance, which is the maintenance and care measures taken to ensure the smooth use of the oil well. The first category is complex salvage. The so-called complex salvage refers to the situation of fallen objects in the oil and gas wells that is very complicated due to various reasons. The second category is repairing the oil well casing. The casing is a necessary condition to ensure the normal production of oil and gas wells, and casing damage often occurs in oil wells due to various reasons. Therefore, repairing the oil well casing is one of the main tasks of the overhaul operation team. The third category is drilling inside the casing, that is, using a small drill pipe with a drill bit, it is lowered into the casing of the old well, and a window is drilled at the predetermined position. The small drill bit drills out from the "window" to drill a small wellbore, and then the small casing is lowered and cemented.

[0003] During the drilling and repair process of an oil field, the flowing formation fluid will cause the wellhead pressure to rise, and natural gas or crude oil leakage will often occur, and even well kicks and blowouts will occur, which will bring serious safety hazards to the well repair production. Therefore, a blowout preventer is needed to prevent oil from spraying out and polluting the environment. However, when the existing blowout preventer is installed on the oil well, the sealing performance is poor when a blowout occurs, and a small amount of oil will still leak, causing pollution around the oil well. At the same time, when the blowout preventer is docked with the oil well, the sealing at the docking point is not good, which can easily lead to the hidden danger of oil leakage at that location.

[0004] Therefore, it is necessary to provide a new blowout preventer for oilfield drilling and workover to solve the above-mentioned technical problems. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a blowout preventer for oil field drilling and workover.

[0006] The utility model provides a blowout preventer for oilfield drilling and repairing, comprising an inserting tube, a bottom tube opening of the inserting tube is fixedly fitted with an arc-shaped rubber seat with an arc opening contracting upward, and a tube opening at the top of the inserting tube is a conical cavity structure with a cone head upward and a blowout preventer tank connected to each other is fixedly installed;

[0007] An oil-blocking component is provided in the insertion tube, and the oil-blocking component includes a middle link rod, one end of the middle link rod extends out of the bottom tube opening of the insertion tube and is fixedly installed with a semicircular sealing ball with the spherical surface facing upward, and the other end of the middle link rod passes through the conical cavity and extends into the spray-proof tank, and a blocking disc is fixedly installed at the extended end of the middle link rod, and a spring is provided on the blocking disc;

[0008] The waist of the inserting tube is fixedly installed with a connecting flange for connecting to the oil well and an extension component for sealing the gap between the inserting tube and the inner wall of the oil well.

[0009] Preferably, one end of the spring is fixedly mounted on the upper surface of the baffle plate, and the other end of the spring is fixedly connected to the inner top wall of the spray-proof can.

[0010] Preferably, a tapered piston is fixedly sleeved on the middle link, and the tapered piston is adapted to the tapered cavity.

[0011] Preferably, the extended connection component includes a pull ring, which is sleeved on the insertion tube and located below the connecting flange, and an annular corrugated elastic airbag is provided on the pull ring, and a plurality of annularly distributed and vertically arranged through holes are provided on the annular corrugated elastic airbag, and a plurality of annularly distributed traction rods are fixedly mounted on the pull ring, and the traction rods pass through the through holes provided in the annular corrugated elastic airbag and the sliding through holes provided in the connecting flange, the top of the traction rod extends to above the connecting flange and a central connecting ring is fixedly mounted thereon, and a hydraulic cylinder is fixedly mounted on the spray preventer, and the output end of the hydraulic cylinder is fixedly connected to the central connecting ring.

[0012] Preferably, the lower bag surface of the annular corrugated elastic airbag is fixedly connected to the upper ring surface of the pull ring, and the upper bag surface of the annular corrugated elastic airbag is fixedly connected to the lower surface of the connecting flange.

[0013] Preferably, a plurality of annularly distributed oil-conducting flow chambers are provided in the insertion tube, and a nozzle is fixedly installed at the liquid inlet above the oil-conducting flow chamber, and the nozzle is arranged to be inclined downward toward the axis direction of the insertion tube.

[0014] Compared with the related art, the blowout preventer for oilfield drilling and workover provided by the utility model has the following beneficial effects:

[0015] 1. When a blowout occurs, the high-pressure liquid pushes the semicircular sealing ball to slide upward, and the semicircular sealing ball fits with the arc-shaped rubber seat, thereby forming a primary seal, which can greatly reduce the amount of oil sprayed. At the same time, the middle link drives the conical piston to slide upward, so that the conical piston seals the conical cavity, thereby achieving a secondary seal, further reducing the oil spray, and avoiding the oil leakage during blowout;

[0016] 2. The utility model compresses the annular corrugated elastic airbag and expands it laterally by opening the hydraulic cylinder. The expanded annular corrugated elastic airbag can quickly fill the gap between the insertion tube and the oil well and achieve effective sealing, thereby avoiding the hidden dangers of oil leakage and eruption from the gap connecting the insertion tube and the oil well. Since the expanded annular corrugated elastic airbag is an elastic structure, when the blowout preventer vibrates, it will not cause the problem of sealing failure at the connection between the insertion tube and the oil well. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A structural schematic diagram of a preferred embodiment of a blowout preventer for oil field drilling and workover provided by the utility model;

[0018] Figure 2 for Figure 1 The structural schematic diagram of the insertion tube shown;

[0019] Figure 3 for Figure 1 The structural schematic diagram of the oil-blocking component shown;

[0020] Figure 4 for Figure 1 The structural schematic diagram of the extended connection component is shown.

[0021] Numbers in the figure: 1. Insertion cylinder; 1a. Conical cavity; 1b. Oil guide cavity; 11. Arc rubber seat; 12. Spray-proof can; 13. Connecting flange; 13a. Sliding through hole; 2. Oil-blocking component; 21. Center link rod; 22. Semicircular sealing ball; 23. Blocking disc; 24. Spring; 25. Conical piston; 3. Nozzle; 4. Extension component; 41. Pull ring; 42. Annular corrugated elastic airbag; 43. Traction rod; 44. Center link ring; 45. Hydraulic cylinder. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0023] The specific implementation of the present utility model is described in detail below in conjunction with specific embodiments.

[0024] See also Figures 1 to 4 The embodiment of the utility model provides a blowout preventer for oilfield drilling and workover, and the blowout preventer for oilfield drilling and workover comprises an insertion tube 1, an oil blocking component 2 and an extension component 4.

[0025] In the embodiments of the present invention, please refer to Figures 1 to 4 The bottom opening of the insertion tube 1 is fixedly fitted with an arc-shaped rubber seat 11 with an arc opening that shrinks upward, and the top opening of the insertion tube 1 is a conical cavity 1a structure with a cone head upward and is fixedly installed with a spray-proof can 12 that is interconnected;

[0026] The waist of the insertion tube 1 is fixedly installed with a connecting flange 13 for connecting to the oil well and an extension component 4 for sealing the gap between the insertion tube 1 and the inner wall of the oil well, and the extension component 4 includes a pull ring 41, which is sleeved on the insertion tube 1 and located below the connecting flange 13, and an annular corrugated elastic airbag 42 is provided on the pull ring 41. Specifically, the lower bag surface of the annular corrugated elastic airbag 42 is fixedly connected to the upper ring surface of the pull ring 41, and the upper bag surface of the annular corrugated elastic airbag 42 is fixedly connected to the lower surface of the connecting flange 13. The annular corrugated elastic airbag 42 is fixedly connected, and a plurality of annularly distributed and vertically arranged through holes are arranged on the annular corrugated elastic airbag 42. A plurality of annularly distributed traction rods 43 are fixedly installed on the pull ring 41, and the traction rods 43 pass through the through holes arranged on the annular corrugated elastic airbag 42 and the sliding through holes 13a opened in the connecting flange 13. The top of the traction rod 43 extends to the top of the connecting flange 13 and is fixedly provided with a central link ring 44. A hydraulic cylinder 45 is fixedly installed on the spray-proof tank 12, and the output end of the hydraulic cylinder 45 is fixedly connected to the central link ring 44.

[0027] It should be noted that: when installing the blowout preventer, the insertion tube 1 is inserted into the oil well and the connecting flange 13 is placed on the flange of the oil well, and then fixed with bolts. After completion, the hydraulic cylinder 45 is turned on to drive the output end of the hydraulic cylinder 45 to drive the middle link ring 44 to slide up along the insertion tube 1. Since the middle link ring 44 is connected to the pull ring 41 through the traction rod 43, the pull ring 41 slides up along the insertion tube 1. Since the top of the annular corrugated elastic airbag 42 is abutted by the connecting flange 13, the annular The bottom of the corrugated elastic airbag 42 compresses the pull ring 41, so that the annular corrugated elastic airbag 42 can expand horizontally, and the expanded annular corrugated elastic airbag 42 can quickly fill the gap between the insertion tube 1 and the oil well and achieve effective sealing, avoiding the hidden dangers of oil leakage and eruption from the gap connecting the insertion tube 1 and the oil well. Since the expanded annular corrugated elastic airbag 42 is an elastic structure, when the blowout preventer vibrates, it will not cause the problem of sealing failure at the connection between the insertion tube 1 and the oil well.

[0028] In the embodiments of the present invention, please refer to Figures 1 to 4 An oil-blocking component 2 is provided in the insertion tube 1, and the oil-blocking component 2 includes a middle link rod 21, one end of the middle link rod 21 extends out of the bottom tube mouth of the insertion tube 1 and is fixedly installed with a semicircular sealing ball 22 with the spherical surface facing upward, and the other end of the middle link rod 21 passes through the conical cavity 1a and extends into the spray-proof can 12, a blocking disk 23 is fixedly installed at the extended end of the middle link rod 21, and a spring 24 is provided on the blocking disk 23, and one end of the spring 24 is fixedly installed on the upper surface of the blocking disk 23, and the other end of the spring 24 is fixedly connected to the inner top wall of the spray-proof can 12, and a conical piston 25 is fixedly sleeved on the middle link rod 21, and the conical piston 25 is adapted to the conical cavity 1a.

[0029] It should be noted that: when a blowout occurs, the high-pressure liquid pushes the semicircular sealing ball 22 to slide upward, and the semicircular sealing ball 22 fits with the arc-shaped rubber seat 11 whose arc mouth shrinks upward, thereby forming a primary seal, which can greatly reduce the amount of oil sprayed out. At the same time, the middle link rod 21 drives the conical piston 25 to slide upward, so that the conical piston 25 seals the conical cavity 1a, thereby achieving a secondary seal, further reducing the oil spraying, and avoiding the oil leakage during the blowout. When the middle link rod 21 slides upward, the blocking plate 23 compresses the spring 24. When the blowout phenomenon ends, the semicircular sealing ball 22 and the conical piston 25 are driven to reset under the elastic force of the spring 24.

[0030] Among them, a plurality of annularly distributed oil guide flow chambers 1b are opened in the insertion tube 1, and a nozzle 3 is fixedly installed at the liquid inlet above the oil guide flow chamber 1b, and the nozzle 3 is arranged downwardly inclined toward the axial direction of the insertion tube 1. When the oil enters the insertion tube 1, part of the oil enters the oil guide flow chamber 1b and is sprayed downward by the nozzle 3, thereby forming a convection impact with the oil entering from the bottom of the insertion tube 1, which greatly reduces the impact force of the oil spraying.

[0031] The working principle of the blowout preventer for oil field drilling and repairing provided by the utility model is as follows:

[0032] When installing the blowout preventer, the insertion tube 1 is inserted into the oil well and the connecting flange 13 is placed on the flange of the oil well, and then fixed with bolts. After completion, the hydraulic cylinder 45 is turned on to drive the output end of the hydraulic cylinder 45 to drive the middle link ring 44 to slide up along the insertion tube 1. Since the middle link ring 44 is connected to the pull ring 41 through the traction rod 43, the pull ring 41 slides up along the insertion tube 1. Since the top of the annular corrugated elastic airbag 42 is abutted by the connecting flange 13, the annular corrugated elastic airbag 42 is The bottom of the elastic airbag 42 compresses the pull ring 41, so that the annular corrugated elastic airbag 42 can expand horizontally, and the expanded annular corrugated elastic airbag 42 can quickly fill the gap between the insertion tube 1 and the oil well and achieve effective sealing, avoiding the hidden danger of oil leakage and eruption from the gap between the insertion tube 1 and the oil well. Since the expanded annular corrugated elastic airbag 42 is an elastic structure, when the blowout preventer vibrates, it will not cause the sealing failure problem at the connection between the insertion tube 1 and the oil well.

[0033] When a blowout occurs, the high-pressure liquid pushes the semicircular sealing ball 22 to slide upward, and the semicircular sealing ball 22 fits with the arc-shaped rubber seat 11 with the arc mouth shrinking upward, thereby forming a primary seal, which can greatly reduce the amount of oil sprayed out. At the same time, the middle link 21 drives the conical piston 25 to slide upward, so that the conical piston 25 seals the conical cavity 1a, thereby achieving secondary sealing, further reducing the oil spraying and avoiding the oil leakage during blowout. After the oil enters the insertion tube 1, part of the oil enters the oil guide cavity 1b and is sprayed downward by the nozzle 3, thereby forming a convection impact with the oil entering the bottom of the insertion tube 1, greatly reducing the impact force of the oil spraying, and when the middle link 21 slides upward, the blocking plate 23 compresses the spring 24. When the blowout phenomenon ends, under the elastic force of the spring 24, the semicircular sealing ball 22 and the conical piston 25 are driven to reset.

[0034] The circuits and controls involved in the present invention are all prior art and will not be described in detail here.

[0035] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A blowout preventer for oilfield drilling and workover, characterized in that: It comprises an insertion tube (1), wherein the bottom tube opening of the insertion tube (1) is fixedly engaged with an arc-shaped rubber seat (11) whose arc opening contracts upward, and the top tube opening of the insertion tube (1) is a conical cavity (1a) structure with a cone head upward and is fixedly mounted with a spray-proof can (12) that are interconnected; An oil-blocking component (2) is provided in the insertion tube (1), and the oil-blocking component (2) comprises a middle link rod (21), one end of the middle link rod (21) extends out of the bottom tube opening of the insertion tube (1) and is fixedly mounted with a semicircular sealing ball (22) with the spherical surface facing upward, and the other end of the middle link rod (21) passes through the conical cavity (1a) and extends into the spray-proof can (12), a blocking disc (23) is fixedly mounted on the extended end of the middle link rod (21), and a spring (24) is arranged on the blocking disc (23); A connecting flange (13) for connecting to an oil well and an extension component (4) for sealing a gap between the inserting tube (1) and the inner wall of the oil well are fixedly mounted on the waist of the inserting tube (1).

2. The blowout preventer for oilfield drilling and workover according to claim 1, characterized in that: One end of the spring (24) is fixedly mounted on the upper surface of the blocking disk (23), and the other end of the spring (24) is fixedly connected to the inner top wall of the spray-proof can (12).

3. The blowout preventer for oilfield drilling and workover according to claim 2, characterized in that: A conical piston (25) is fixedly sleeved on the middle link rod (21), and the conical piston (25) is adapted to the conical cavity (1a).

4. The blowout preventer for oilfield drilling and workover according to claim 1, characterized in that: The extension component (4) comprises a pull ring (41), the pull ring (41) is sleeved on the insertion tube (1) and is located below the connecting flange (13), the pull ring (41) is provided with an annular corrugated elastic airbag (42), and the annular corrugated elastic airbag (42) is provided with a plurality of annularly distributed and vertically arranged through holes, a plurality of annularly distributed traction rods (43) are fixedly mounted on the pull ring (41), and the traction rods (43) pass through the through holes provided in the annular corrugated elastic airbag (42) and the sliding through holes (13a) opened in the connecting flange (13), the top of the traction rod (43) extends to the top of the connecting flange (13) and is fixedly provided with a middle connecting ring (44), the spray-proof tank (12) is fixedly provided with a hydraulic cylinder (45), and the output end of the hydraulic cylinder (45) is fixedly connected to the middle connecting ring (44).

5. The blowout preventer for oilfield drilling and workover according to claim 4, characterized in that: The lower bag surface of the annular corrugated elastic airbag (42) is fixedly connected to the upper ring surface of the pull ring (41), and the upper bag surface of the annular corrugated elastic airbag (42) is fixedly connected to the lower surface of the connecting flange (13).

6. The blowout preventer for oilfield drilling and workover according to claim 1, characterized in that: The insertion tube (1) is provided with a plurality of annularly distributed oil guide flow chambers (1b), and a nozzle (3) is fixedly installed at a liquid opening above the oil guide flow chamber (1b), and the nozzle (3) is arranged downwardly inclined in the direction of the axis of the insertion tube (1).

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