A mud blowout preventer box for a workover equipment under pressure

Abstract

The present application discloses a mud blowout preventer box for pressure operation equipment, which relates to the technical field of drilling blowout prevention equipment. It includes a box body, a gland and a bottom plate. A central hole for the drill pipe to pass through is provided on the box body. A discharge port is provided on the side wall of the box body. A first sealing pressure ring is provided at the top of the box body, and a second sealing pressure ring is provided at the bottom of the box body. Both the first sealing pressure ring and the second sealing pressure ring are made of elastic materials. The gland is installed on the top of the box body and is used to squeeze the first sealing pressure ring. A first through hole for communicating with the central hole is provided on the gland. The bottom plate is installed at the bottom of the box body and is used to squeeze the second sealing pressure ring. A second through hole for communicating with the central hole is provided on the bottom plate. Fixing structures for fixing the gland and the bottom plate are respectively provided on the box body. The present application has the effect of effectively preventing the mud in the drill pipe from spraying out during the uncoupling process, and avoiding polluting the drill floor and the surrounding environment.

Description

Technical Field

[0001] The present application relates to the technical field of drilling blowout preventers, and particularly to a mud blowout preventer box for a pressure workover device.

[0002] Background Art

[0003] The pressure workover device plays an important role in oil drilling operations. However, when the pressure workover device is in use, especially during the process of tripping out a single joint and pulling out the drill string, the drill string needs to be frequently disassembled, and the mud or workover fluid remaining in the drill string is likely to spurt out, causing environmental pollution.

[0004] Currently, to solve the problem of mud spraying when the drill string is uncoupled, the commonly adopted methods include using a simple sealing cover or sleeve to close the drill string interface to prevent mud from spraying out. The advantages of these methods are simple structure and low cost, but they are prone to leakage under high-pressure environments, and the sealing performance is unstable, unable to effectively prevent a large amount of mud from spraying out, resulting in the contamination of the drill floor and surrounding tools, increasing the difficulty of subsequent cleaning work. Summary of the Invention

[0005] In view of the problems existing in the prior art, the present application provides a mud blowout preventer box for a pressure workover device.

[0006] The mud blowout preventer box for a pressure workover device provided by the present application adopts the following technical solutions:

[0007] A mud blowout preventer box for a pressure workover device includes a box body, a gland, and a bottom plate. A central hole for the drill string to pass through is provided on the box body. A discharge port is provided on the side wall of the box body. A first sealing compression ring is provided at the top end of the box body, and a second sealing compression ring is provided at the bottom end of the box body. Both the first sealing compression ring and the second sealing compression ring are made of elastic materials. The gland is installed on the top of the box body and is used to squeeze the first sealing compression ring. A first through hole for communicating with the central hole is provided on the gland. The bottom plate is installed at the bottom of the box body and is used to squeeze the second sealing compression ring. A second through hole for communicating with the central hole is provided on the bottom plate. Fixing structures for fixing the gland and the bottom plate are respectively provided on the box body.

[0008] Optionally, a first crimping groove communicating with the central hole is provided at the top end of the box body. The first sealing compression ring is arranged in the first crimping groove. A first crimping ring is fixedly provided at the bottom end of the gland, and the first crimping ring is adapted to the first crimping groove. A second crimping groove communicating with the central hole is provided at the bottom end of the box body. The second sealing compression ring is arranged in the second crimping groove. A second crimping ring is fixedly provided at the top end of the bottom plate, and the second crimping ring is adapted to the second crimping groove.

[0009] Optionally, arc convex surfaces are provided at one ends of the first crimping ring away from the gland and the second crimping ring away from the bottom plate.

[0010] Optionally, a number of cavities are provided inside the first sealing crimping ring and the second sealing crimping ring, and rubber elastic balls are filled in each cavity.

[0011] Optionally, a plurality of sliding grooves are provided on the side walls of the first crimping groove, a top block is slidably arranged in each sliding groove, and a driving structure for driving each top block to slide in the direction of approaching each other is provided on the box body.

[0012] Optionally, the driving structure includes a driving ring and a top rod. A receiving cavity communicating with each sliding groove is provided in the box body. The driving ring is slidably arranged in the receiving cavity. The inner side wall of the driving ring is inclined. Guide inclined surfaces are provided on the end faces of the top blocks away from each other, and the guide inclined surfaces on each top block are in contact with the inner side wall of the driving ring. The top rod is fixedly arranged on the driving ring and is used for abutting against the gland.

[0013] Optionally, an adjusting ring is slidably arranged in the first crimping groove. The adjusting ring is arranged between the first sealing crimping ring and the bottom wall of the first crimping groove. An elastic member for driving the adjusting ring to slide in the direction close to the first sealing crimping ring is provided in the first crimping groove.

[0014] Optionally, the elastic member includes an elastic steel ring. The elastic steel ring is arranged in a wave shape, one end of the elastic steel ring is in contact with the bottom wall of the first crimping groove, and the other end of the elastic steel ring is in contact with the adjusting ring.

[0015] Optionally, the inner side wall of the adjusting ring is inclined, and the inner diameter of the adjusting ring gradually increases in the direction away from the bottom wall of the first crimping groove.

[0016] Optionally, the fixing structure includes a threaded cylinder and a compression bolt. A plurality of threaded cylinders are provided and are respectively fixed on the side walls at the top or bottom positions of the box body. The compression bolt is adapted to the threaded cylinder. A plurality of connection holes for the compression bolt to pass through are provided on both the gland and the bottom plate.

[0017] In summary, the present application includes at least one of the following beneficial technical effects:

[0018] 1. The present application provides a mud blowout preventer box for pressure operation equipment, which can effectively prevent the mud in the drill string from spraying out during the tool joint disconnection, and avoid polluting the drill floor and the surrounding environment. Specifically, a first sealing pressure ring and a second sealing pressure ring are respectively arranged at the top end and the bottom end of the box body, and these sealing pressure rings are made of elastic materials. The first sealing pressure ring can abut against the side wall of the drill pipe under the extrusion of the gland, and effectively seal the gap between the drill pipe and the box body. The second sealing pressure ring can tightly press against the side wall of the drill string under the extrusion of the bottom plate, and effectively seal the gap between the drill string and the box body, ensuring that the mud will not leak. At the same time, a discharge port is arranged on the side wall of the box body. When the drill pipe is disassembled from the drill string, all the mud in the drill string is sprayed into the box body, and the mud in the box body is smoothly discharged to the mud storage through the discharge port, thereby effectively preventing a large amount of mud from spraying out and causing pollution to the drill floor and the surrounding tools. In addition, the design of the fixing structure enables the gland and the bottom plate to be firmly fixed on the box body, ensuring the stability and reliability of the entire device.

[0019] 2. Through the design of the first crimping groove and the second crimping groove, the present application respectively limits the positions and deformation directions of the first sealing pressure ring and the second sealing pressure ring, enabling the first sealing pressure ring and the second sealing pressure ring to better fit the drill pipe and the drill string, and enhancing the sealing effect. Further, by providing a first crimping ring adapted to the first crimping groove on the gland and a second crimping ring adapted to the second crimping groove on the bottom plate, while increasing the sealing performance between the box body, the gland and the bottom plate, the positioning is more convenient when the gland and the bottom plate are installed on the box body, improving the assembly efficiency.

[0020] 3. The present application opens a plurality of sliding grooves on the side wall of the first crimping groove, and a top block is slidably arranged in each sliding groove. When the first sealing pressure ring is extruded and abuts against the side wall of the drill pipe, the driving structure is used to drive the top blocks to approach each other, applying a certain lateral extrusion force to the first sealing pressure ring, causing the first sealing pressure ring to deform towards the middle, which can effectively enhance the sealing performance and the sealing reliability of the first sealing pressure ring, ensuring that it can still maintain a good sealing effect under high-pressure environments.

[0021] 4. The present application arranges an adjusting ring in the first crimping groove, and the adjusting ring can slide towards the direction close to the first sealing pressure ring under the action of the elastic member, and form an elastic extrusion force on the first sealing pressure ring, thereby adaptively adjusting the contact pressure between the first sealing pressure ring and the drill string, ensuring stable sealing performance under different pressure conditions, and improving the reliability and service life of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is the overall structural schematic diagram of the embodiment of the present application;

[0023] Figure 2It is a cross-sectional view of the overall structure of an embodiment of the present application;

[0024] Figure 3 is Figure 2 an enlarged view of part A in

[0025] Figure 4 It is a schematic structural diagram of an elastic steel ring used in an embodiment of the present application.

[0026] Explanation of reference numerals: 1, box body; 101, central hole; 102, discharge port; 103, threaded cylinder; 104, compression bolt; 105, handle; 106, first crimping groove; 107, first sealing compression ring; 108, second crimping groove; 109, second sealing compression ring; 110, cavity; 111, rubber elastic ball; 112, adjusting ring; 113, elastic steel ring; 114, chute; 115, top block; 116, driving ring; 117, ejector rod; 118, accommodating cavity; 119, installation groove; 120, disc cover; 2, gland; 21, first through hole; 22, first crimping ring; 3, bottom plate; 31, second through hole; 32, side plate; 321, installation hole; 33, second crimping ring. Detailed implementation manners

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the attached Figure 1 - attached Figure 4 , and the described embodiments are only possible technical implementations of the present invention, not all possible implementations. Those skilled in the art can completely combine the embodiments of the present invention to obtain other embodiments without creative labor, and these embodiments are also within the protection scope of the present invention.

[0028] The inventors of the present application found that the existing blowout preventer boxes used in drilling and workover equipment cannot meet the requirements of pressure - operated equipment, resulting in the spraying of mud when removing drill pipes, seriously polluting the drill floor and surrounding tools, and bringing great trouble to subsequent cleaning work. Therefore, the present application discloses a mud blowout preventer box for pressure - operated equipment, mainly adopting the following solutions:

[0029] An embodiment of the present application discloses a mud blowout preventer box for pressure - operated equipment. Referring to Figure 1 and Figure 2 , it includes a box body 1, a gland 2 installed on the top of the box body 1, and a bottom plate 3 installed on the bottom of the box body 1. A central hole 101 is provided on the box body 1, and the central hole 101 is used to accommodate the drill pipe, and its diameter is slightly larger than the outer diameter of the drill pipe to ensure the smooth passage of the drill pipe. A first through hole 21 for communicating with the central hole 101 is provided on the gland 2, a second through hole 31 for communicating with the central hole 101 is provided on the bottom plate 3, and a discharge port 102 is provided on the side wall of the box body 1, and the discharge port 102 is used to discharge the mud in the box body 1.

[0030] Refer to Figure 1 , fixing structures for fixing the gland 2 and the bottom plate 3 are respectively arranged on the box body 1. The fixing structures include threaded cylinders 103 and pressing bolts 104. There are multiple threaded cylinders 103 which are respectively fixed on the side walls at the top or bottom positions of the box body 1. The threaded cylinders 103 located at the top of the box body 1 are evenly distributed along the circumferential direction of the box body 1, and the threaded cylinders 103 located at the bottom of the box body 1 are evenly distributed along the circumferential direction of the box body 1. The pressing bolts 104 are adapted to the threaded cylinders 103. Multiple connection holes for the pressing bolts 104 to pass through are arranged on both the gland 2 and the bottom plate 3. The connection holes on the gland 2 correspond to the threaded cylinders 103 at the top of the box body 1 one by one, and the connection holes on the bottom plate 3 correspond to the threaded cylinders 103 at the bottom of the box body 1 one by one.

[0031] Refer to Figure 1 , handles 105 are fixedly arranged on both sides of the box body 1. It is convenient to hoist the box body 1 through the handles 105 on both sides of the box body 1. Workers can also hold the box body 1 through the handles 105 on both sides to position the box body 1, increasing the convenience of use. In addition, side plates 32 are respectively fixedly arranged on both sides of the bottom plate 3, and mounting holes 321 are formed in the side plates 32. The bottom plate 3 can be fixed on the pressure operation machine through bolts and the mounting holes 321 on both side plates 32.

[0032] Refer to Figure 2 , a first crimping groove 106 communicated with the central hole 101 is arranged at the top end of the box body 1, a first sealing pressure ring 107 is arranged in the first crimping groove 106, a second crimping groove 108 communicated with the central hole 101 is arranged at the bottom end of the box body 1, a second sealing pressure ring 109 is arranged in the second crimping groove 108. Both the first sealing pressure ring 107 and the second sealing pressure ring 109 are made of elastic materials, such as silica gel or rubber.

[0033] Refer to Figure 2 and Figure 3 , a number of cavities 110 are arranged inside both the first sealing pressure ring 107 and the second sealing pressure ring 109, and rubber elastic balls 111 are filled in each cavity 110; by arranging a number of cavities 110 inside both the first sealing pressure ring 107 and the second sealing pressure ring 109 and arranging rubber elastic balls 111 in each cavity 110, when the first sealing pressure ring 107 or the second sealing pressure ring 109 is squeezed, the rubber elastic balls 111 will be squeezed and move, so as to ensure that while the first sealing pressure ring 107 and the second sealing pressure ring 109 have better ductility, the first sealing pressure ring 107 and the second sealing pressure ring 109 still have good sealing performance and can maintain good sealing effect under different pressure conditions.

[0034] Refer to Figure 2 and Figure 3, a first crimping ring 22 is fixedly arranged at the bottom end of the gland 2. The first crimping ring 22 is adapted to the first crimping groove 106 and is used for extruding the first sealing press ring 107. A second crimping ring 33 is fixedly arranged at the top end of the bottom plate 3. The second crimping ring 33 is adapted to the second crimping groove 108 and is used for extruding the second sealing press ring 109. When the gland 2 is installed and fixed, by inserting the first crimping ring 22 into the first crimping groove 106 at the top of the box body 1, it is convenient to position the gland 2. And as the gland 2 is tightly fixed, the first sealing press ring 107 is extruded by the first crimping ring 22, causing the first sealing press ring 107 to deform and abut against the side wall of the drill pipe, effectively closing the gap between the drill pipe and the box body 1. When the bottom plate 3 is installed and fixed, the second crimping ring 33 is inserted into the second crimping groove 108 at the bottom of the box body 1 to position the bottom plate 3. And as the bottom plate 3 is installed and fixed, the second sealing press ring 109 is extruded by the second crimping ring 33, causing the second sealing press ring 109 to deform and abut tightly against the side wall of the connecting end on the drill tool, and effectively closing the gap between the drill tool and the box body 1.

[0035] Referring to Figure 2 and Figure 3 , in order to prevent the first sealing press ring 107 and the second sealing press ring 109 from being torn and damaged due to extrusion and extend the service life of the first sealing press ring 107 and the second sealing press ring 109, arc convex surfaces are provided at one end of the first crimping ring 22 away from the gland 2 and at one end of the second crimping ring 33 away from the bottom plate 3.

[0036] Referring to Figure 3 and Figure 4 , an adjusting ring 112 is slidably arranged in the first crimping groove 106. The inner side wall of the adjusting ring 112 is inclined, and the inner diameter of the adjusting ring 112 gradually increases along the direction away from the bottom wall of the first crimping groove 106. The adjusting ring 112 is arranged between the first sealing press ring 107 and the bottom wall of the first crimping groove 106. An elastic member for driving the adjusting ring 112 to slide towards the first sealing press ring 107 is arranged in the first crimping groove 106. The elastic member includes an elastic steel ring 113. In the embodiment of the present application, the elastic steel ring 113 is arranged in a wavy shape, and one end of the elastic steel ring 113 abuts against the bottom wall of the first crimping groove 106, and the other end of the elastic steel ring 113 abuts against the adjusting ring 112. In other embodiments of the application, the elastic member can also be a spring. The design of the adjusting ring 112 enables the first sealing press ring 107 to automatically adjust its position when being pressed, maintaining the best sealing state. The design of the elastic steel ring 113 increases the elasticity of the adjusting ring 112, enabling it to maintain a stable sealing effect under different pressure conditions. Further, by arranging the inner side wall of the adjusting ring 112 to be inclined, the deformation direction of the first sealing press ring 107 is guided, further improving the sealing performance of the gap between the drill pipe and the box body 1.

[0037] Referring toFigure 2 and Figure 3 , a plurality of sliding grooves 114 are formed in the side walls of the first crimping groove 106. In the embodiment of the present application, the first crimping groove 106 is provided with two, and is symmetrically arranged on both sides of the box body 1. In other embodiments of the application, any number of sliding grooves 114 can be provided, and are equidistantly distributed along the circumferential direction of the box body 1. A top block 115 is slidably arranged in each sliding groove 114, and a guiding block is fixedly arranged on the top block 115. A guiding groove for the sliding block to slide is formed in the side wall of the sliding groove 114, and an arc-shaped chamfer is arranged at the edge position of the sliding groove 114.

[0038] Referring to Figure 3 , a driving structure for driving each top block 115 to slide in the direction of approaching each other is arranged on the box body 1. The driving structure includes a driving ring 116 and a top rod 117. A receiving cavity 118 communicating with each sliding groove 114 is arranged in the box body 1. The driving ring 116 is slidably arranged in the receiving cavity 118, and the inner side wall of the driving ring 116 is inclined. The end faces of each top block 115 facing away from each other are provided with guiding inclined surfaces, and the guiding inclined surfaces on each top block 115 are in contact with the inner side wall of the driving ring 116. Specifically, in order to facilitate the installation of the driving ring 116 and the top block 115, an installation groove 119 communicating with the receiving cavity 118 and each sliding groove 114 is formed at the top end of the box body 1. A disc cover 120 is fixed in the installation groove 119 by bolts. The top rod 117 is fixedly arranged on the driving ring 116, and the length direction of the top rod 117 is vertical. The top rod 117 slidably penetrates through the disc cover 120.

[0039] When the gland 2 is installed, the gland 2 abuts against the top rod 117. As the gland 2 is installed, the driving ring 116 is moved by the top rod 117. Under the guidance of the inclined inner side wall of the driving ring 116 and the guiding inclined surfaces on each top block 115, each top block 115 is driven to approach each other, applying a certain lateral extrusion force to the first sealing pressing ring 107, so that the first sealing pressing ring 107 deforms towards the middle, thereby effectively enhancing the sealing performance and sealing reliability of the first sealing pressing ring 107, and ensuring that it can still maintain a good sealing effect under high-pressure environment.

[0040] The implementation principle of the mud blowout preventer box for a pressure operation device in an embodiment of this application is as follows: A first sealing pressure ring 107 and a second sealing pressure ring 109 are respectively arranged at the top and bottom of the box body 1, and these sealing pressure rings are made of elastic materials. When the gland 2 is installed and fixed, the first sealing pressure ring 107 is extruded by the first crimping ring 22. The first sealing pressure ring 107 can abut against the side wall of the drill pipe under the extrusion of the first crimping ring 22 and effectively seal the gap between the drill pipe and the box body 1. When the bottom plate 3 is installed and fixed, the second sealing pressure ring 109 is extruded by the second crimping ring 33. The second sealing pressure ring 109 can abut tightly against the side wall of the drill tool under the extrusion of the second crimping ring 33 and effectively seal the gap between the drill tool and the box body 1, ensuring that the mud will not leak. At the same time, a drain port 102 is provided on the side wall of the box body 1. When the drill pipe is removed from the drill tool, all the mud in the drill tool is sprayed into the box body 1, and the mud in the box body 1 is smoothly discharged to the mud storage place through the drain port 102, thereby effectively preventing a large amount of mud from spraying out and contaminating the drill floor and surrounding tools.

[0041] The above are all preferred embodiments of this application, and the protection scope of this application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A mud blowout preventer box for a pressure operation device, characterized in that: It includes a box body (1), a gland (2) and a bottom plate (3). A central hole (101) through which a drill tool can pass is provided on the box body (1). A discharge port (102) is provided on the side wall of the box body (1). A first sealing press ring (107) is provided at the top end of the box body (1), and a second sealing press ring (109) is provided at the bottom end of the box body (1). Both the first sealing press ring (107) and the second sealing press ring (109) are made of elastic materials. The gland (2) is installed on the top of the box body (1) and is used to squeeze the first sealing press ring (107). A first through hole (21) for communicating with the central hole (101) is provided on the gland (2). The bottom plate (3) is installed at the bottom of the box body (1) and is used to squeeze the second sealing press ring (109). A second through hole (31) for communicating with the central hole (101) is provided on the bottom plate (3). Fixing structures for fixing the gland (2) and the bottom plate (3) are respectively provided on the box body (1). A first crimping groove (106) communicating with the central hole (101) is provided at the top end of the box body (1). The first sealing press ring (107) is arranged in the first crimping groove (106). A first crimping ring (22) is fixedly provided at the bottom end of the gland (2). The first crimping ring (22) is adapted to the first crimping groove (106). A plurality of sliding grooves (114) are respectively provided on the side walls of the first crimping groove (106). A top block (115) is slidably arranged in each sliding groove (114). A driving structure for driving each top block (115) to slide in the direction of approaching each other is provided on the box body (1). The driving structure includes a driving ring (116) and a top rod (117). An accommodating cavity (118) communicating with each sliding groove (114) is provided in the box body (1). The driving ring (116) is slidably arranged in the accommodating cavity (118). The inner side wall of the driving ring (116) is inclined. Guide inclined surfaces are respectively provided on the end faces of each top block (115) away from each other, and the guide inclined surfaces on each top block (115) are in contact with the inner side wall of the driving ring (116). The top rod (117) is fixedly provided on the driving ring (116) and is used to abut against the gland (2).

2. The mud blowout preventer box for a pressure operation device according to claim 1, characterized in that: A second crimping groove (108) communicating with the central hole (101) is provided at the bottom end of the box body (1). The second sealing press ring (109) is arranged in the second crimping groove (108). A second crimping ring (33) is fixedly provided at the top end of the bottom plate (3). The second crimping ring (33) is adapted to the second crimping groove (108).

3. The mud blowout preventer box for pressure operation equipment according to claim 2, characterized in that: Arc convex surfaces are respectively provided at one end of the first crimping ring (22) away from the gland (2) and at one end of the second crimping ring (33) away from the bottom plate (3).

4. The mud blowout preventer box for pressure operation equipment according to claim 2, characterized in that: A number of cavities (110) are respectively provided inside the first sealing press ring (107) and the second sealing press ring (109). Rubber elastic balls (111) are filled in each cavity (110).

5. The mud blowout preventer box for a pressure operation device according to claim 1, characterized in that: An adjusting ring (112) is slidably arranged in the first crimping groove (106). The adjusting ring (112) is arranged between the first sealing pressing ring (107) and the bottom wall of the first crimping groove (106). An elastic member for driving the adjusting ring (112) to slide towards the first sealing pressing ring (107) is arranged in the first crimping groove (106).

6. The mud blowout preventer box for a workover equipment under pressure is characterized in that: The elastic member includes an elastic steel ring (113). The elastic steel ring (113) is arranged in a wavy shape. One end of the elastic steel ring (113) abuts against the bottom wall of the first crimping groove (106), and the other end of the elastic steel ring (113) abuts against the adjusting ring (112).

7. A mud blowout preventer box for a pressure operation device according to claim 5, characterized in that: The inner side wall of the adjusting ring (112) is inclined, and the inner diameter of the adjusting ring (112) gradually increases in the direction away from the bottom wall of the first crimping groove (106).

8. The mud blowout preventer box for the workover equipment under pressure according to claim 1, wherein: The fixing structure includes a threaded cylinder (103) and a pressing bolt (104). There are a plurality of threaded cylinders (103) which are respectively fixed on the side walls at the top or bottom positions of the box body (1). The pressing bolt (104) is adapted to the threaded cylinder (103). A plurality of connection holes for the pressing bolt (104) to pass through are arranged on both the pressing cover (2) and the bottom plate (3).

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