A device for preventing the splashing of drilling fluid

Abstract

The application discloses a device for preventing drilling fluid from splashing, which comprises a main body and a locking assembly. An accommodating cavity for accommodating a tubing coupling is arranged in the main body. The main body can be opened and closed along the radial direction of the tubing coupling. One end of the tubing coupling is connected with a lower oil pipe. An opening is arranged at one end of the accommodating cavity. The opening is used for accommodating the lower oil pipe and clamping the lower oil pipe on the tubing coupling. A sealing plate is arranged at the other end of the accommodating cavity. A sealing element is arranged on the surface of the sealing plate which is in contact with the tubing coupling. The sealing plate is pressed against the other end of the tubing coupling through a pressing assembly. The locking assembly is used for locking and fixing the device for preventing drilling fluid from splashing on the tubing coupling. The device for preventing drilling fluid from splashing is used for accommodating the tubing coupling in the accommodating cavity and sealing, and the locking assembly is used for locking and fixing, so that the traditional sealing mode of screwing a plug into the inside of the tubing coupling is changed into the sealing mode of covering and sealing from the outside of the tubing coupling. The operation is more convenient, and the sealing is more rapid and efficient.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of oil drilling technology, and particularly relates to a device for preventing drilling fluid from splashing. BACKGROUND

[0002] In the oil drilling industry, during oil field minor repair operations, tubing is often lifted, and problems such as well kick, blowout and tubing top-off are prone to occur. In particular, when the tubing is unbuckled, some drilling fluid is splashed out from the top of the tubing, which is prone to cause safety accidents and environmental problems.

[0003] At present, a common solution is to quickly screw a plug on the coupling at the top of the tubing to prevent liquid from splashing out. However, this method can cause a large amount of drilling fluid in the tubing to be unable to flow back, and the worker also needs to unscrew the plug one turn at a time, which is not only troublesome and inefficient, but also has low reliability. At the same time, since the plug has no handle, when the overflow amount is large, installation is extremely inconvenient, and the small screw contact surface between the plug and the tubing coupling is prone to shaking and difficult to align during tightening, which also brings many inconveniences to the workers. SUMMARY

[0004] In view of the deficiencies of the prior art, the present application aims to provide a device for preventing drilling fluid from splashing, which is reliable in plugging, simple in operation and high in working efficiency.

[0005] To achieve the above-mentioned application purposes, the technical means adopted by the present application is as follows: a device for preventing drilling fluid from splashing, comprising a main body and a locking assembly, an accommodating cavity for accommodating a tubing coupling is arranged inside the main body, the main body is openable and closable along the radial direction of the tubing coupling, one end of the tubing coupling is connected to a tubing, one end of the accommodating cavity is provided with an opening, the opening is used for accommodating the tubing and clamping on the tubing coupling, the other end of the accommodating cavity is provided with a sealing plate, the surface of the sealing plate in contact with the tubing coupling is provided with a sealing element, the sealing plate is pressed and abuts against the other end of the tubing coupling through a pressing assembly, and the locking assembly is used for locking and fixing the device for preventing drilling fluid from splashing on the tubing coupling.

[0006] Preferably, the pressing assembly is an elastic element arranged between the sealing plate and the inner wall of the accommodating cavity.

[0007] Preferably, the inner wall of the accommodating cavity is provided with a sliding rail along the axial direction of the tubing coupling, and the side wall of the sealing plate is provided with a sliding block matched with the sliding rail.

[0008] Preferably, the pressing assembly is a pressing bolt arranged on the main body along the axial direction of the tubing coupling, one end of the pressing bolt extends into the accommodating cavity and is located between the sealing plate and the main body, and the other end of the pressing bolt extends out of the main body.

[0009] Preferably, the locking assembly comprises a bolt-nut assembly and a matching part arranged on the main body, the matching part is matched with the bolt-nut assembly to realize locking and fixing.

[0010] Preferably, a through hole is arranged on the main body, a pressing column is arranged on the sealing plate and passes through the through hole, and the pressing assembly presses the pressing column.

[0011] Preferably, the pressing assembly comprises a pressing plate and a fixing part, the fixing part fixes the pressing plate on the main body, and the pressing plate presses the pressing column.

[0012] Preferably, an air hole is arranged in the sealing plate, the air hole is communicated with the oil pipe joint and external air, and a one-way valve is arranged in the air hole.

[0013] Preferably, a valve hole is arranged on the main body, and the one-way valve is exposed in the valve hole.

[0014] Preferably, a hinge is arranged on the main body to realize opening and closing. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a three-dimensional schematic view of the device for preventing well drilling fluid from splashing 01 of the embodiment one of the present application when not matched;

[0016] Figure 2 is a three-dimensional schematic view of the device for preventing well drilling fluid from splashing 01 of the embodiment one of the present application when matched and locked;

[0017] Figure 3 is a three-dimensional schematic view of the device for preventing well drilling fluid from splashing 01 accommodating the oil pipe joint 02 of the embodiment one of the present application;

[0018] Figure 4 is a sectional view schematic diagram of the device for preventing well drilling fluid from splashing 01 of the embodiment one of the present application when matched and locked;

[0019] Figure 5 is a three-dimensional exploded schematic view of part of the device for preventing well drilling fluid from splashing 01 of the embodiment one of the present application;

[0020] Figure 6 is Figure 4 is an enlarged schematic view of A in the middle;

[0021] Figure 7 is a schematic view of the device for preventing well drilling fluid from splashing 01 of the embodiment one of the present application when not matched and locked;

[0022] Figure 8This is a cross-sectional schematic diagram of the device 21 for preventing drilling fluid splashing according to Embodiment 2 of the present invention when it is engaged and locked.

[0023] Figure 9 This is a three-dimensional schematic diagram of the device 21 for preventing drilling fluid splashing according to Embodiment 2 of the present invention when it is engaged and locked.

[0024] Figure 10 yes Figure 8 Enlarged view of point B in the middle;

[0025] Figure 11 This is a cross-sectional schematic diagram of the device 31 for preventing drilling fluid splashing according to Embodiment 3 of the present invention when it is engaged and locked.

[0026] Figure 12 This is a cross-sectional schematic diagram of the device 41 for preventing drilling fluid splashing in Embodiment 4 of the present invention when it is engaged and locked. Detailed Implementation

[0027] As requested, specific embodiments of the invention are disclosed herein. However, it should be understood that the embodiments disclosed herein are merely typical examples of the invention, which may be embodied in various forms. Therefore, the specific details disclosed herein are not to be considered limiting, but merely serve as the basis for the claims and as a representative basis for teaching those skilled in the art to apply the invention differently in practice in any appropriate manner, including employing the various features disclosed herein in combination with features that may not be explicitly disclosed herein.

[0028] Example 1:

[0029] like Figures 1-4 As shown, the drilling fluid splash prevention device 01 of Embodiment 1 of this application includes a main body 10 and a locking assembly 20. The main body 10 has a receiving cavity 100 for accommodating the tubing coupling 02. The main body 10 can be opened and closed along the radial direction of the tubing coupling 02. One end of the tubing coupling 02 is connected to the lower tubing 03. One end of the receiving cavity 100 has an opening 101 for accommodating the lower tubing 03 and securing it to the tubing coupling 02. The other end of the receiving cavity 100 blocks the other end of the tubing coupling 02. The locking assembly 20 is used to lock and fix the drilling fluid splash prevention device 01 to the tubing coupling 02.

[0030] The device 01 for preventing drilling fluid splashing of this application houses and seals the tubing coupling 02 within the housing cavity 100, while simultaneously locking it in place with a locking assembly 20. This changes the traditional method of sealing by screwing a plug into the tubing coupling to a method of sealing by wrapping the tubing coupling 02 from the outside, making the operation more convenient and the sealing faster and more efficient.

[0031] Specifically, in the embodiment, the main body 10 is in a cylindrical shape as a whole, and the accommodating cavity 100 is a cylindrical cavity matching the shape of the oil pipe coupling 02. When plugging, the height of the cavity part in the accommodating cavity 100 is equal to the height of the oil pipe coupling 02, so that the oil pipe coupling 02 can be reliably plugged, and the drilling fluid can be effectively prevented from being thrown out. The aperture of the opening 101 is greater than or equal to the outer diameter of the lower oil pipe 03 to facilitate accommodating the oil pipe coupling 02. The main body 10 is provided with a step plate 102 at the opening 101 for abutting on the lower end surface of the oil pipe coupling 02 when plugging, so as to be clamped on the oil pipe coupling 02.

[0032] The main body 10 includes two split bodies 11 and 12 that can be opened and closed. The split bodies 11 and 12 are closed to form the accommodating cavity 100 inside and are locked by the locking assembly 20. Specifically, the split bodies 11 and 12 are in a semicylindrical shape cut along the axial direction of the oil pipe coupling 02. The sizes of the split bodies 11 and 12 can be equal or not equal, as long as the oil pipe coupling 02 can be accommodated in the accommodating cavity 100. The split bodies 11 and 12 are opened and closed through the hinge 13. That is, the hinge 13 is installed at the position where the split bodies 11 and 12 are connected. The number of the hinge 13 can be one or more, which can stably connect the split bodies 11 and 12. The split bodies 11 and 12 are both provided with the step plate 102. When the split bodies 11 and 12 are closed, the step plates 102 on the split bodies 11 and 12 are also closed. The cavity between the two step plates 102 is the opening 101.

[0033] The other end of the accommodating cavity 100 is provided with the sealing plate 103 for tightly plugging the other end of the oil pipe coupling 02. The sealing plate 103 is a rubber plate, which can be made of materials such as silicone rubber, fluororubber, etc. The sealing plate 103 has a certain elasticity and can withstand a certain pressure when plugging to tightly and reliably plug. The diameter of the accommodating cavity 100 is equal to the diameter of the sealing plate 103 and greater than the caliber of the oil pipe coupling 02, so that the end of the oil pipe coupling 02 can be completely plugged. In other embodiments, the sealing plate 103 can also be a plate body made of other materials that can achieve the sealing performance of plugging, such as polyurethane elastomer, etc. Alternatively, the sealing plate 103 can be made of hard materials such as metal materials, wood, etc., and an elastic sealing element is arranged on the surface of the side of the sealing plate 103 in contact with the oil pipe coupling 02 to achieve the function of reliably plugging. The elastic sealing element can be a sealing ring arranged between the sealing plate 103 and the oil pipe coupling 02 or a rubber sheet that can cover the caliber of the oil pipe coupling 02. In other embodiments, the sealing plate 103 can not be additionally arranged, but the end of the main body 10 directly plugs.

[0034] The main body 10 is provided with the pressing assembly 110, which presses the sealing plate 103 to abut on the other end of the oil pipe coupling 02. Specifically, in combination with the sealing plate 103, the pressing assembly 110 is arranged on the main body 10 and is used to press the sealing plate 103 to abut on the other end of the oil pipe coupling 02. Figure 5The main body 10 is provided with a through hole 104, the sealing plate 103 is provided with a pressing column 105, the pressing column 105 passes through the through hole 104, and the pressing assembly 110 presses the sealing plate 103 by pressing the pressing column 105. The pressing column 105 can be a cylindrical column, a prismatic column, a special-shaped column or various forms of columns, and the through hole 104 can be a circular hole, a prismatic hole, a special-shaped hole or various forms of holes, as long as the pressing column 105 can pass through the through hole 104 and can move up and down in the through hole 104, which is not limited here.

[0035] The pressing spring 106 is arranged on the outer periphery of the pressing column 105, and the end of the pressing column 105 is provided with a nut 1051 so that the pressing spring 106 is sleeved on the pressing column 105 and cannot fall off, that is, the pressing spring 106 is arranged between the sealing plate 103 and the nut 1051. The pressing assembly 110 includes a bracket 111 and a pressing rod 112 arranged on the bracket 111, the bracket 111 is sleeved on the outer periphery of the pressing column 105, and the pressing rod 112 presses the pressing column 105. Specifically, the bracket 111 is a frame structure, which is arranged on the outer side of the main body 10 and has a gap so that the pressing column 105 can be arranged in the gap. In this embodiment, the bracket 111 is in the form of a cylindrical shell, and the part connected with the main body 10 is hollowed out to form the above-mentioned gap. In other embodiments, the bracket 111 can also have other solid or hollow structures, as long as the pressing rod 112 can be arranged thereon to press the pressing column 105, which is not limited here.

[0036] Continuing to refer to Figures 1-4 The pressing rod 112 includes a rod body 113 and a cam 114 arranged at one end of the rod body 113, and the cam 114 is rotatably connected with the bracket 111 through a rotating shaft structure, so that the pressing and loosening between the cam 114 and the pressing column 105 can be realized. Specifically, the rod body 113 is used for gripping and pressing operation, the cam 114 is used for abutting against the pressing column 105 to realize pressing, and the position design between the cam 114 and the pressing column 105 can make the cam 114 close to the pressing column 105 and gradually press the pressing column 105 to reach the dead point position of the cam 114 when the rod body 113 is gripped and pressed, so that the sealing plate 103 can be firmly and reliably pressed and abutted against the other end of the pipe joint 02. In this way, even if the oil pipe 03 has high pressure, the device 01 for preventing drilling fluid from splashing cannot be opened, and the pressing spring 106 is in a pressed state at this time. When the rod body 113 is gripped and pulled up, the cam 114 can move away from the pressing column 105, and at this time, the pressing spring 106 gradually loosens and drives the pressing column 105 to move upward, so that the sealing plate 103 gradually moves away from the pipe joint 02, thereby releasing the pressing and abutting state between the sealing plate 103 and the pipe joint 02, facilitating the backflow of the drilling fluid in the oil pipe 03, and the operation is convenient, safe and reliable.

[0037] In this embodiment, the rotating shaft structure adopts a bolt and nut assembly. Specifically, the cam 114 is provided with a cam through hole (not shown), the bracket 111 is provided with a first through hole 1111 and a second through hole 1112 at the same height position at a preset position, the bolt 115 passes through the first through hole 1111, the cam through hole and the second through hole 1112 in sequence, and is fastened with the nut 116 so that the bolt 115 is fixed on the bracket 111. The diameter of the cam through hole is slightly larger than the diameter of the bolt 115, so that the cam 114 can rotate around the bolt 115. In other embodiments, the bolt 115 can be clamped in the cam through hole, the diameters of the first through hole 1111 and the second through hole 1112 are slightly larger than the diameter of the bolt 115, and the rotation of the cam 114 can also be achieved; or other common rotating shaft structures can also be used, which will not be described here.

[0038] Referring to Figures 1-3 , the locking assembly 20 includes a connecting rod bolt 210 arranged in linkage with the sealing plate 103 and a matching part 220 arranged on the main body 10. The connecting rod bolt 210 includes a connecting rod part 211, a bolt part 212, a first base 213 and a second base 214. In order to facilitate the arrangement of the first base 213, a gap 14 is formed on the main body 10 when the split body 11 and the split body 12 are closed, the sealing plate 103 is located in the accommodation cavity 100, and the first base 213 extends from the gap 14 to the outside of the main body 10.

[0039] In combination Figure 5 , the connecting rod part 211 is arranged in parallel with the bolt part 212, the connecting rod part 211 is a long column, and the bolt part 212 includes a first bolt 2121 and a second bolt 2122. The first base 213 is arranged integrally with the sealing plate 103 and extends from the side wall of the sealing plate 103 to the outside of the main body 10. The first base 213 is arranged along the axial direction of the main body 10 to form a first connecting rod hole 2131 and a first bolt hole 2132. The second base 214 is arranged along the axial direction of the main body 10 to form a second connecting rod hole 2141 and a second bolt hole 2142. The first connecting rod hole 2131 and the second connecting rod hole 2141 are located on the same axis for inserting and fixing the connecting rod part 211, and the first bolt hole 2132 and the second bolt hole 2142 are located on the same axis for inserting and fixing the bolt part 212.

[0040] Specifically, the first pin 2121 is inserted into and fixed in the first pin hole 2132, and the first pin 2121 extends out of the first pin hole 2132 by a portion to form the first extension 21211. The second pin 2122 is inserted into and fixed in the second pin hole 2142, and the second pin 2122 extends out of the second pin hole 2142 by a portion to form the second extension 21221. Since the link portion 211 and the pin portion 212 are both fixed in the first base 213 and the second base 214, when the closure plate 103 is pressed against the tubing coupling 02 by the pressing assembly 110, the link pin 210 can be linked to move up and down with the closure plate 103 reciprocating up and down.

[0041] The fitting portion 220 includes a fitting plate 221 and a fixing plate 222. The fitting plate 221 has two groups, both of which are arranged on the body 10. The two groups are identical in structure, one group of the fitting plate 221 is located below the first base 213, and the other group of the fitting plate 221 is located below the second base 214. The fixing plate 222 also has two, which are matched with the two groups of the fitting plate 221 to realize the locking function with the first pin 2121 and the second pin 2122.

[0042] Taking the group of the fitting plate 221 located below the first base 213 as an example for description. Specifically, in combination with Figure 5 and Figure 7 , the group of the fitting plate 221 has two plate bodies 2211 arranged in parallel, and the two plate bodies 2211 are spaced apart by a certain distance to allow the fixing plate 222 to be inserted therebetween. Each plate body 2211 is provided with a first fitting hole 2212 and a second fitting hole 2213. The first fitting hole 2212 is coaxial with the first link hole 2131 to allow the link portion 211 to be inserted thereinto, and the diameter of the link portion 211 is smaller than that of the first fitting hole 2212 so that the link portion 211 can reciprocate in the first fitting hole 2212. The second fitting hole 2213 is coaxial with the first pin hole 2132 to allow the first pin 2121 to be inserted thereinto, and the diameter of the first pin 2121 is smaller than that of the second fitting hole 2213 so that the first pin 2121 can reciprocate in the second fitting hole 2213. The fixing plate 222 is provided with a fixing hole 2221, and when the split body 11 and the split body 12 are closed, the fixing plate 222 is inserted between the two plate bodies 2211, and at this time, the fixing hole 2221 is coaxial with the second fitting hole 2213 to facilitate the insertion and locking of the first pin 2121. The structure and fitting mode of the other group of the fitting plate 221 and the other fixing plate 222 are also the same, and will not be described here.

[0043] When assembling the device 01 for preventing drilling fluid splashing, the connecting rod 211 is sequentially passed through the first connecting rod hole 2131 on the first base 213, the first mating holes 2212 on the two plates 2211 of a set of mating plates 221, the second connecting rod hole 2141 on the second base 214, and the first mating holes 2212 on the two plates 2211 of another set of mating plates 221. The connecting rod 211 is fixed in the first connecting rod hole 2131 and the second connecting rod hole 2141 and can reciprocate in the first mating hole 2212. The first pin 2121 is fixed in the first pin hole 2132, and when not locked, the first extension 21211 is inserted into the side near the first base 213 (i.e., Figure 5 The first extension 21211 is inserted into the second mating hole 2213 of the plate 2211 (located at the top center) when locking. When locking, the first extension 21211 moves downward and inserts into the fixing hole 2221 of the fixing plate 222 to achieve locking. Similarly, the second pin 2122 is fixed in the second pin hole 2142. When not locked, the second extension 21221 is inserted into the second mating hole 2213 of the plate 2211 of another set of mating plates 221 near the second base 214. When locking, the second extension 21221 moves downward and inserts into the fixing hole 2221 of another fixing plate 222 to achieve locking. Because the connecting rod pin 210 is linked to the sealing plate 103, after the split parts 11 and 12 are engaged, only one press of the operating rod 113 is needed to tighten the sealing plate 103, which can completely block the tubing coupling 02 and simultaneously lock and fix the drilling fluid splash prevention device 01 onto the tubing coupling 02. A single simple action is all it takes to conveniently and reliably prevent drilling fluid from spraying out. When drilling fluid backflow is required, grasping and pulling up the operating rod 113 releases the sealing plate 103, which simultaneously drives the connecting rod pin 210, causing the first pin 2121 and the second pin 2122 to retract from the fixing hole 2221 into the second mating hole 2213, thus releasing the locking state. The sealing plate 103 and the tubing coupling 02 can then be separated, as can the split parts 11 and 12. The operation is very convenient and efficient.

[0044] See Figure 4 and Figure 6The air hole 107 is provided in the sealing plate 103 and is connected with the oil pipe coupling 02 and the external air. The air hole 107 is provided with an air valve. In the embodiment, the air valve is a valve bead 108 provided in the air hole 107. The valve bead 108 can roll in the air hole 107 to realize the connection and closure of the oil pipe coupling 02 and the external air. Specifically, the air hole 107 is a zigzag hole and has a valve bead channel 1071 in which the valve bead 108 can roll and communicate with the external air, and a communication channel 1073 which is connected with the inside of the oil pipe coupling 02 and the valve bead channel 1071. The diameter of the valve bead channel 1071 is larger than that of the valve bead 108, and a tapered surface 1072 is provided at one end of the valve bead channel 1071 which communicates with the external air. The small diameter end of the tapered surface 1072 is slightly smaller than the diameter of the valve bead 108, and the diameter of the communication channel 1073 is smaller than that of the valve bead 108, so that the valve bead 108 is limited in the valve bead channel 1071. In other embodiments, the air hole 107 can also be an arc hole or other forms, as long as the valve bead 108 can roll in it to realize the connection and closure of the oil pipe coupling 02 and the external air.

[0045] When the oil pipe coupling 02 and the external air are closed, the valve bead 108 is sealed and clamped on the tapered surface 1072. Specifically, when the oil pipe 03 is lowered, the inside of the oil pipe 03 has a pressure which is transmitted to the valve bead channel 1071 through the communication channel 1073 of the air hole 107, so that the valve bead 108 is abutted to the small diameter end of the tapered surface 1072, and the valve bead 108 closely fits the small diameter end to ensure that the drilling fluid can be reliably blocked to prevent external spouting. When the oil pipe 03 is unbuckled, the pressure in the inside of the oil pipe 03 no longer exists. Under the action of the pressure of the external air, the valve bead 108 moves to the inside of the valve bead channel 1071 to move away from the small diameter end of the tapered surface 1072, so that the external air enters the air hole 107, that is, the inside of the oil pipe 03 is connected with the external atmospheric pressure, thereby facilitating the backflow of the drilling fluid to the wellhead, safe and environmentally friendly, and high reliability.

[0046] A vent groove 109 is arranged at the joint of the valve ball channel 1071 and the communication channel 1073, which is a groove connecting the valve ball channel 1071 and the communication channel 1073. The cross-sectional diameter of the communication channel 1073 at the position of the vent groove 109 is larger than the diameter of the valve ball 108. During the backflow of the drilling fluid, even if the valve ball 108 happens to block the joint of the valve ball channel 1071 and the communication channel 1073, the external gas can still enter the communication channel 1073 through the vent groove 109, which can reliably ensure the communication with the external atmosphere, so that the working process of the backflow of the drilling fluid to the wellhead is smooth and efficient. In other embodiments, the vent groove 109 can not be arranged, and the communication channel 1073 can be arranged as a special-shaped hole such as a sawtooth-shaped hole, which has a part smaller than the diameter of the valve ball 108 to limit the valve ball 108 to be located in the valve ball channel 1071, and also has a part larger than the diameter of the valve ball 108 to enable the external air to enter the communication channel 1073.

[0047] In combination Figures 1-7 The working process of the device for preventing drilling fluid from splashing 01 is described. During the tubing running operation, after the tubing coupling 02 is connected with the tubing 03, the device for preventing drilling fluid from splashing 01 is installed on the tubing coupling 02, so that the tubing coupling 02 is located in the accommodation cavity 100. Figure 7 The state when it is not locked is shown in FIG. 6, at this time, only the tubing coupling 02 is accommodated in the accommodation cavity 100, and the sealing plate 103 is away from the upper end of the tubing coupling 02. The two parts 11 and 12 are closed, so that each fixed plate 222 is inserted into the gap between the two plate bodies 2211, the pressing lever 113 is gripped, so that the cam 114 presses the pressure column 105 and reaches the dead point position of the cam 114, at this time, the sealing plate 103 gradually approaches the upper port of the tubing coupling 02 under the action of pressure and is reliably pressed tightly, and the compression spring 106 is in a compressed state, at the same time, the sealing plate 103 drives the connecting rod bolt 210, so that the first extension 21211 of the first bolt 2121 is inserted into the fixed hole 2221 of the fixed plate 222, and the second extension 21221 of the second bolt 2122 is also inserted into the fixed hole 2221 of the other fixed plate 222, thereby locking and fixing the device for preventing drilling fluid from splashing 01 on the tubing coupling 02. Figure 4 The state when it is locked is shown in FIG. 7, at this time, the lower end surface of the sealing plate 103 is tightly pressed against the upper port of the tubing coupling 02. Therefore, only one simple pressing action can achieve the reliable buckling of the device for preventing drilling fluid from splashing 01 and the tight pressing of the sealing plate 103 against the tubing coupling 02, which is convenient to operate and has high working efficiency.

[0048] When the device 01 needs to be disassembled, only need to grasp the pull rod 113 to remove the dead point position of the cam 114, so that the cam 114 gradually moves away from the pressure column 105, under the elastic action of the compression spring 106, the sealing plate 103 moves away from the upper end of the tubing coupling 02, and the first and second pins 2121 and 2122 are driven out of the corresponding fixed holes 2221, so that the sealing plate 103 and the device 01 are simultaneously released from the clamping state of the tubing coupling 02 and the device 01, and the device 01 can be removed.

[0049] In order to facilitate lifting during operation, a lifting device is arranged on the main body 10. In this embodiment, the lifting device is a ball head lifting rod 15 which can rotate 360 degrees. The ball head lifting rod 15 is arranged at the top of the support 111, and the support 111 is provided with a support hole 1113. The ball head part of the ball head lifting rod 15 is clamped in the support hole 1113, and the other end of the ball head lifting rod 15 is provided with a chain hole for connecting with a chain for lifting. In other embodiments, the lifting device can also be a chain, a rope or other common lifting tools arranged directly on the main body 10.

[0050] Embodiment two:

[0051] Referring to Figures 8-9 The device 21 for preventing drilling fluid from splashing in the second embodiment of the application is basically similar to the device 01 for preventing drilling fluid from splashing in the first embodiment in terms of the main structure, except that the structures of the compression assembly and the locking assembly are different. In this embodiment, no compression rod, compression column, connecting rod pin and other components are arranged.

[0052] Specifically, the device 21 for preventing drilling fluid from splashing includes a main body 22 and a locking assembly 23. The main body 22 is internally provided with a containing cavity 200 for containing a tubing coupling 021. The main body 22 is openable and closable along the radial direction of the tubing coupling 021. One end of the tubing coupling 021 is connected to a lower pipe 031. One end of the containing cavity 200 is provided with an opening for containing the lower pipe 031 and clamping on the tubing coupling 021. The other end of the containing cavity 200 is provided with a sealing plate 203. The surface of the sealing plate 203 in contact with the tubing coupling 021 is provided with a sealing element 201. The sealing plate 203 is pressed against the other end of the tubing coupling 021 by the compression assembly. The locking assembly 23 is used to lock and fix the device 21 for preventing drilling fluid from splashing on the tubing coupling 021.

[0053] The compression assembly is an elastic member arranged between the sealing plate 203 and the inner wall of the accommodating cavity 200, and there is at least one elastic member. Specifically, in the embodiment, the compression assembly is two springs 202 arranged between the sealing plate 203 and the inner wall of the accommodating cavity 200. The two springs 202 are symmetrically distributed along the radial direction of the tubing coupling 021, so as to ensure that the pressure is evenly distributed when the springs 202 are compressed, and to ensure that the sealing plate 203 reliably seals the tubing coupling 021. Both of the two springs 202 are fixedly connected with the sealing plate 203 and the inner wall of the accommodating cavity 200, and are compressed in the axial direction of the tubing coupling 021 during sealing.

[0054] In other embodiments, the spring 202 can be fixed only on the upper surface of the sealing plate 203, or only in the accommodating cavity 200, or not fixed at all, but placed directly between the sealing plate 203 and the inner wall of the accommodating cavity 200. In this case, when the device 21 for preventing drilling fluid from splashing is installed on the outer side of the tubing coupling 021, the spring 202 needs to be placed between the sealing plate 203 and the inner wall of the accommodating cavity 200 in the axial direction of the tubing coupling 021 to ensure that it can be stressed in this direction. The elastic member can also be arranged in other structures, such as the sealing plate 203 being made of a material with a certain elasticity, such as silicone rubber, fluororubber, etc., and having a thickness greater than the gap width between the tubing coupling 021 and the inner wall of the accommodating cavity 200. In this way, when the device 21 for preventing drilling fluid from splashing is installed on the outer side of the tubing coupling 021, the sealing plate 203 will naturally be pressed by the pressure applied by the inner wall of the accommodating cavity 200, so as to be pressed against the other end of the tubing coupling 021 to achieve sealing. The sealing plate 203 itself plays the role of the compression assembly when it is stressed.

[0055] In combination with Figure 8 and Figure 10 , the inner wall of the accommodating cavity 200 is provided with a sliding rail 204 in the axial direction of the tubing coupling 021, and the side wall of the sealing plate 203 is provided with a sliding block 205 cooperating with the sliding rail 204. In this way, the sealing plate 203 can travel in a defined path when it moves up and down, avoiding twisting and shaking of the sealing plate 203 under external force, which can damage the performance of the spring 202, thereby prolonging the service life. The sliding rail 204 is at least one straight groove opened in the inner wall of the accommodating cavity 200, and the sliding block 205 is a protrusion arranged on the side wall of the sealing plate and cooperating with the straight groove. Specifically, in the embodiment, the sliding rail 204 is provided with two straight grooves, which are symmetrically distributed along the radial direction of the accommodating cavity 200, and the number of sliding blocks 205 is equal to the number of sliding rails 204, so as to ensure that the sealing plate 203 is stressed evenly when it moves up and down, avoiding uneven stress affecting the stability of movement. In other embodiments, the sliding rail 204 can be three or more, and can be uniformly or non-uniformly distributed along the circumference of the accommodating cavity 200, and the number of sliding blocks 205 can be equal to or less than the number of sliding rails 204, as long as the sealing plate 203 can move up and down smoothly.

[0056] Referring to Figure 9 , the locking assembly 23 comprises a bolt 231 and a matching part 232 arranged on the main body 22, the matching part 232 is butted with the main body 22 along the radial direction of the tubing coupling 021, the matching part 232 has the same structure as the matching part 220 in the first embodiment, and will not be described here again. The bolt 231 replaces the latch part inserted into the corresponding hole of the matching part 232 to achieve locking and fixing.

[0057] In other embodiments, the locking assembly 23 can also comprise a nut, which is combined with the bolt 231 to form a bolt-nut assembly cooperating with the matching part 232 to achieve locking and fixing.

[0058] Referring to Figure 8 and Figure 9 , in this embodiment, the top end of the main body 22 is provided with a connecting hole 233, and the ball head lifting rod 234 is directly arranged in the connecting hole 233 to facilitate lifting.

[0059] Embodiment three:

[0060] Referring to Figure 11 , the device 31 for preventing splashing of drilling fluid in the third embodiment of the application is basically similar in main structure to the device 21 for preventing splashing of drilling fluid in the second embodiment, and the difference lies in the structure of the pressing assembly.

[0061] Specifically, in this embodiment, the pressing assembly is a pressing bolt 302 arranged on the main body 32 along the axial direction of the tubing coupling 022, one end of the pressing bolt 302 extends into the accommodating cavity 300 and is located between the sealing plate 303 and the main body 32, and the other end of the pressing bolt 302 extends out of the main body 32. Two threaded holes are arranged on the main body 32 and are symmetrically distributed along the radial direction of the accommodating cavity 300, and the pressing bolt 302 is screwed into the threaded holes. The pressing bolt 302 has a certain length, when the tubing coupling 022 is placed in the accommodating cavity 300, the sealing plate 303 is in contact with the other end of the tubing coupling 022, and then the pressing bolt 302 is screwed to enable one end of the pressing bolt 302 to abut against the upper end of the sealing plate 303 and press the sealing plate 303 against the other end of the tubing coupling 022. In other embodiments, the threaded holes can be three or more, which can be uniformly or non-uniformly distributed along the circumference of the accommodating cavity 300, and the number of the pressing bolts 302 can be equal to or less than the number of the threaded holes, which can ensure reliable pressing of the sealing plate 303.

[0062] The air hole 304 is arranged in the sealing plate 303 and is communicated with the oil pipe coupling 022 and the external air, and a one-way valve 305 is arranged in the air hole 304. The valve hole 306 is arranged on the main body 32, and the one-way valve 305 is exposed in the valve hole 306. When the oil pipe 032 is lowered, the one-way valve 305 is closed, and the internal pressure of the oil pipe 032 is transmitted into the one-way valve 305 through the air hole 304, and since the one-way valve 305 is closed, it can be ensured that the drilling fluid can be reliably blocked to prevent external spouting. When the oil pipe 032 is unbuckled, the internal pressure of the oil pipe 032 no longer exists, and at this time, the one-way valve 305 needs to be opened, so that the external air can enter the air hole 304, that is, the internal part of the oil pipe 032 is connected with the external atmospheric pressure, so that the drilling fluid can be conveniently returned to the wellhead, which is safe, environmentally friendly and high in reliability. The valve hole 306 is arranged so as to conveniently close and open the one-way valve 305.

[0063] Embodiment four:

[0064] Referring to Figure 12 The device 41 for preventing spouting of drilling fluid in the embodiment four of the present application is basically similar to the device 01 for preventing spouting of drilling fluid in the embodiment one in the main structure, and the difference lies in the structure of the pressing assembly.

[0065] The through hole is arranged on the main body 42, the pressing column 405 is arranged on the sealing plate 403 and passes through the through hole, and the pressing assembly presses the pressing column 405. The pressing assembly comprises the pressing plate 401 and the fixing piece, the fixing piece fixes the pressing plate 401 on the main body 42, and the pressing plate 401 presses the pressing column 405. Specifically, two threaded holes are arranged on the main body 42 and are symmetrically distributed along the radial direction of the accommodating cavity 400, two light holes corresponding to the threaded holes are arranged on the pressing plate 401, and the fixing piece is two bolts 402. When the oil pipe coupling 023 is arranged in the accommodating cavity 400 and the sealing plate 403 is in contact with the other end of the oil pipe coupling 023, the bolts 402 are screwed into the threaded holes on the main body 42 through the light holes on the pressing plate 401, and the bolts 402 are screwed so that one end of the bolt 402 can abut against the upper end of the sealing plate 403 and press the sealing plate 403 on the other end of the oil pipe coupling 023. In other embodiments, the threaded holes can be three or more, and can be uniformly or non-uniformly distributed along the circumference of the accommodating cavity 400, the number of the bolts 402 can be equal to or less than the number of the threaded holes, and the number of the light holes is equal to the number of the bolts 402, which can ensure that the sealing plate 403 can be reliably pressed.

[0066] The technical content and technical features of the present application have been disclosed above, however, it can be understood that, under the creative idea of the present application, those skilled in the art can make various changes and improvements on the above structure and material, including the combination of the technical features disclosed or claimed herein, and obviously including other combinations of the features. The deformations and / or combinations all fall within the technical field to which the present application relates, and fall within the protection scope of the claims of the present application.

Claims

1. A device for preventing the spilling of drilling fluid, characterized by: The device comprises a main body and a locking assembly. An accommodating cavity is arranged in the main body for accommodating a tubing coupling. The main body is openable and closable along the radial direction of the tubing coupling. One end of the tubing coupling is connected to a lower pipe. An opening is arranged at one end of the accommodating cavity for accommodating the lower pipe and clamping the tubing coupling. A sealing plate is arranged at the other end of the accommodating cavity. A sealing element is arranged on the surface of the sealing plate in contact with the tubing coupling. The sealing plate is pressed against the other end of the tubing coupling by a pressing assembly to completely block the tubing coupling. The locking assembly is used to lock and fix the device for preventing drilling fluid from splashing on the tubing coupling. An air hole is arranged in the sealing plate. The air hole is connected to the tubing coupling and the outside air. A one-way valve is arranged in the air hole. When the lower pipe is pulled out, the one-way valve is closed. The pressure inside the lower pipe is transmitted to the one-way valve through the air hole to prevent the drilling fluid from splashing out. After the lower pipe is disconnected, the one-way valve is opened. The outside air enters the air hole to make the drilling fluid flow back to the wellhead. The locking assembly comprises a connecting rod bolt arranged in linkage with the sealing plate and a matching part arranged on the main body. The matching part closes the main body along the radial direction of the tubing coupling. The connecting rod bolt and the matching part are matched to realize locking and fixing. When the pressing assembly applies pressure, the sealing plate presses the tubing coupling and drives the connecting rod bolt to insert into the matching part, thereby simultaneously locking and fixing the device for preventing drilling fluid from splashing on the tubing coupling.

2. The device for preventing the spilling of drilling fluid as claimed in claim 1, wherein: The pressing assembly is an elastic element arranged between the sealing plate and the inner wall of the accommodating cavity.

3. The device for preventing the spilling of drilling fluid of claim 1, wherein: The inner wall of the accommodating cavity is provided with a sliding rail along the axial direction of the tubing coupling. The side wall of the sealing plate is provided with a sliding block matched with the sliding rail.

4. The device for preventing the spilling of drilling fluid of claim 1, wherein: The pressing assembly is a pressing bolt arranged on the main body along the axial direction of the tubing coupling. One end of the pressing bolt extends into the accommodating cavity and is located between the sealing plate and the main body. The other end of the pressing bolt extends out of the main body.

5. The device for preventing the spilling of drilling fluid of claim 1, wherein: A through hole is arranged on the main body. A pressing column is arranged on the sealing plate and passes through the through hole. The pressing assembly presses the pressing column.

6. The device for preventing the spilling of drilling fluid of claim 5, wherein: The pressing assembly comprises a pressing plate and a fixing element. The fixing element fixes the pressing plate on the main body. The pressing plate presses the pressing column.

7. The device for preventing the spilling of drilling fluid of claim 1, wherein: A valve hole is arranged on the main body. The one-way valve is exposed in the valve hole.

8. The device for preventing the spilling of drilling fluid of claim 1, wherein: A hinge is arranged on the main body to realize opening and closing.

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