A mud collection device for a rotary control head

Abstract

The present invention provides a mud collection device for a rotary control head. The rotary control head includes a base assembly, a rotary seal assembly, and an anti-overflow pipe. The mud collection device includes: a mud collection tank; a mud umbrella; and a diversion cover, which is installed between the lower end of the drill floor and the mud collection tank. Wherein, in the first state, the rotary seal assembly is seated in the base assembly, the mud collection tank is sleeved outside the rotary seal assembly, the mud umbrella is installed at the upper end of the rotary seal assembly, and the mud slipping from the drill floor sequentially passes through the diversion cover and the mud umbrella, and thus slides into the mud collection tank; in the second state, the anti-overflow pipe is seated in the base assembly, the mud collection tank is sleeved outside the anti-overflow pipe, the mud umbrella is installed in the middle of the outer edge of the anti-overflow pipe, a part of the mud slipping from the drill floor sequentially passes through the diversion cover and the mud umbrella, and thus slides into the mud collection tank, and another part directly descends from the lower end of the drill floor into the anti-overflow pipe and the wellbore.

Description

Technical Field

[0001] The present invention belongs to the technical field of oil drilling, and particularly relates to a mud collection device for a rotating control head. Background Art

[0002] A rotating control head is an essential device for wellbore pressure control operations such as gas drilling, underbalanced drilling, and managed pressure drilling. The function of the rotating control head is to seal the annulus between the wellbore and the pipe string (drilling tools or casing, etc.) and provide safe and effective pressure control, while guiding the fluid returned from the wellbore away from the wellhead.

[0003] The rotating control head is installed at the uppermost end of the blowout preventer group and mainly includes a rotating seal assembly and a base assembly. Among them, the rotating seal assembly includes a bearing assembly and a rubber core, etc. The base assembly includes a housing, a large bypass, and a base clamp, etc. The base clamp locks and unlocks the rotating seal assembly through a hydraulic cylinder or a locking bolt. The rotating control head can be divided into two forms: a single-rubber-core rotating control head and a double-rubber-core rotating control head according to the number of rubber cores. The lower part of the bearing assembly of the single-rubber-core rotating control head is connected to a rubber core (lower rubber core), and the upper part is connected to a driver; the lower part of the bearing assembly of the double-rubber-core rotating control head is connected to a rubber core (lower rubber core), and the upper part is connected to a coffee cup, and a second rubber core (upper rubber core) is installed inside the coffee cup. The bearing assembly includes an inner cylinder and an outer cylinder, and the inner cylinder and the outer cylinder achieve the functions of bearing and rotating seal through a bearing group and a dynamic seal group. The rotating control head may also include a power station to lubricate and cool the bearing assembly through the power station.

[0004] Currently, during the process of tripping in or out of the well or making a connection on site, the mud in the drill string or on the drill floor splashes onto the rotating control head and the blowout preventer group, and drips onto the ground or seawater, causing potential safety hazards to the equipment and environmental pollution. The mud splashes onto the rotating control head and the blowout preventer group, which will deteriorate the external working environment of the upper rotating seal of the bearing assembly of the rotating control head, resulting in earlier damage to the upper rotating seal. Once the rotating seal fails, the mud will enter the bearing assembly, causing serious damage to the bearing assembly of the rotating control head (if the rotating control head is equipped with a power station to cool and lubricate the bearing assembly, after the upper rotating seal is damaged, the mud will contaminate the cooling water or hydraulic oil, resulting in the inability to use the power station), and the wellbore pressure control technology operation cannot be carried out normally, and serious accidents may be triggered. At the same time, when personnel climb to the wellhead to operate the rotating control head, there will also be potential safety hazards such as slipping and falling due to wetness. In addition, the environmental pollution problem is a major problem that must be taken seriously and solved. Summary of the Invention

[0005] In view of the above technical problems, the present invention aims to provide a mud collection device for a rotary control head, which can effectively collect the mud slipping in the drill string or on the drill floor, effectively improve the upper sealing working environment of the bearing assembly of the rotary control head, and thus can effectively avoid the problems of equipment use safety and environmental pollution during drilling.

[0006] To this end, according to the present invention, there is provided a mud collection device for a rotary control head, the rotary control head including a base assembly, a rotary seal assembly, and an anti-overflow pipe, the mud collection device including: a mud collection tank; a mud umbrella; and a flow guide cover, the flow guide cover being installed between the lower end of the drill floor and the mud collection tank; wherein, in the first state, the rotary seal assembly is seated in the base assembly, the mud collection tank is sleeved outside the rotary seal assembly, the mud umbrella is installed at the upper end of the rotary seal assembly, and the mud slipping from the drill floor sequentially passes through the flow guide cover and the mud umbrella and thus slides into the mud collection tank; in the second state, the anti-overflow pipe is seated in the base assembly, the mud collection tank is sleeved outside the anti-overflow pipe, the mud umbrella is installed at the middle of the outer edge of the anti-overflow pipe, a part of the mud slipping from the drill floor sequentially passes through the flow guide cover and the mud umbrella and thus slides into the mud collection tank, and another part directly descends from the lower end of the drill floor to the anti-overflow pipe and the wellbore.

[0007] In one embodiment, the mud umbrella is configured as an annular mud umbrella baffle, the mud umbrella baffle including an annular baffle body and a cylindrical outer edge connected to the radial end face of the annular baffle body.

[0008] In one embodiment, the mud umbrella baffle is configured to include two butt-connected baffle parts, and connecting plates are respectively fixed to the butt surfaces of the baffle parts, and the two baffle parts are fixedly connected through the connecting plates to form the mud umbrella baffle.

[0009] In one embodiment, the mud collection tank is configured to include a mud collection tank body and a mounting bracket for mounting the mud collection tank body, the mud collection tank body being configured as an annular container with an upper opening, and the mud collection tank body is fixedly connected to the base housing of the base assembly through the mounting bracket.

[0010] In one embodiment, the mud collection tank body includes a cylindrical outer tank plate, an inner tank plate concentrically arranged inside the outer tank plate, and an annular bottom plate for connecting the outer tank plate and the inner tank plate. The height of the outer tank plate is greater than that of the inner tank plate, and the outer diameter of the mud umbrella baffle is smaller than the diameter of the outer tank plate but larger than the diameter of the inner tank plate. The annular bottom plate is fixedly connected to the mounting bracket, and the internal space of the inner tank plate is for the rotary seal assembly or the overflow pipe to pass through.

[0011] In one embodiment, a first diversion hole is provided on the annular bottom plate, and the first diversion hole is used to connect a mud diversion pipe to discharge the collected mud.

[0012] In one embodiment, a plurality of radially extending reinforcing ribs are provided between the outer tank plate and the inner tank plate, and the plurality of reinforcing ribs are evenly distributed in the circumferential direction.

[0013] In one embodiment, the mud collection tank is configured to include two mud collection half-tank bodies with the same structure. The two mud collection half-tank bodies are connected through two connection mechanisms with the same structure. The mud collection half-tank body is configured as a semi-circular ring-shaped container with an open upper part, and an installation part is provided at the bottom of the semi-circular ring-shaped container. The mud collection tank is fixedly connected to the base clamp of the base assembly through the installation part.

[0014] In one embodiment, the mud collection half-tank body is configured to include a semi-tank inner arc plate, a semi-tank outer arc plate, a semi-tank bottom plate for connecting the semi-tank inner arc plate and the semi-tank outer arc plate, and two semi-tank vertical plates, so as to form a semi-circular ring-shaped space for accommodating mud between the semi-tank inner arc plate, the semi-tank outer arc plate and the semi-tank vertical plates. The outer wall surface of the semi-tank outer arc plate is connected to the connection mechanism, so that the two mud collection half-tank bodies are connected, and a through hole for the rotary seal assembly or the overflow pipe to pass through is formed between the semi-tank inner arc plates.

[0015] In one embodiment, a second diversion hole is provided on the semi-tank bottom plate, and the second diversion hole is used to connect a mud diversion pipe to discharge the collected mud.

[0016] In one embodiment, a support member and an auxiliary block are provided inside the mud collection half-tank body. The support member is arranged at the circumferential middle position inside the mud collection half-tank body, and the auxiliary block is arranged on the inner wall of the semi-tank outer arc plate and is close to the semi-tank vertical plate.

[0017] In one embodiment, the installation part is configured to include a semi-groove support frame fixedly connected to the lower end of the semi-groove bottom plate, and a clamp connecting plate fixedly connected to the lower end of the semi-groove support frame, and the clamp connecting plate is used for fixedly connecting with the base clamp.

[0018] In one embodiment, the connecting mechanism includes a connecting outer plate and a connecting inner plate configured to be arc-shaped, and a bridging plate for connecting the connecting outer plate and the connecting inner plate. The connecting outer plate is fixedly connected to the outer wall surface of the semi-groove outer arc plate, and a clearance fit is formed between the connecting inner plate and the outer wall of the semi-groove inner arc plate.

[0019] In one embodiment, an outer plate gasket is provided between the connecting outer plate and the outer wall surface of the semi-groove outer arc plate, and an inner plate gasket is provided between the connecting inner plate and the outer wall of the semi-groove inner arc plate.

[0020] In one embodiment, the fairing is configured as an inverted conical cylinder, and the fairing is made of waterproof canvas.

[0021] Compared with the prior art, the advantages of the present application are as follows:

[0022] The mud collection device for a rotary control head according to the present invention can be applied to all working conditions of the rotary control head. It can effectively collect the mud slipping inside the drill string or on the drill floor, greatly improving the upper sealing working environment of the rotary control head bearing assembly, and effectively avoiding equipment usage safety and environmental pollution problems during drilling. The mud collection device can enable the mud slipping on the drill floor to pass through the fairing and the mud umbrella in sequence, and then slide into the mud collection tank, effectively avoiding the mud from entering the rotary seal assembly or the gap between the overflow pipe and the mud collection tank, thereby effectively improving the working environment of the rotary seal assembly, which is very beneficial to extending the service life of the sealing structure of the rotary control head. In addition, the mud collection tank is convenient to install, does not affect other operations, occupies a small space, and has a high mud collection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be described below with reference to the accompanying drawings.

[0024] Figure 1 is a main semi-sectional view of the rotary control head when the rotary seal assembly is seated in the base assembly without installing the mud collection device according to the present invention.

[0025] Figure 2 and Figure 3 are respectively the left view and the top view of the rotary control head when the rotary seal assembly is seated in the base assembly without installing the mud collection device according to the present invention.

[0026] Figure 4It is an installation schematic diagram in the case where the overflow pipe seat enters the base assembly when the rotary control head is not equipped with the mud collection device according to the present invention.

[0027] Figure 5 and Figure 6 Shows the installation structure of the first embodiment of the mud collection device according to the present invention when the rotary seal assembly is seated in the base assembly.

[0028] Figure 7 Shows the installation structure of the first embodiment of the mud collection device according to the present invention when the overflow pipe seat enters the base assembly.

[0029] Figure 8 and Figure 9 Are respectively the front view and top view of the mud collection tank in the first embodiment of the mud collection device according to the present invention.

[0030] Figure 10 Is Figure 8 The cross-sectional view along line A-A in

[0031] Figure 11 and Figure 12 Shows the installation structure of the second embodiment of the mud collection device according to the present invention when the rotary seal assembly is seated in the base assembly.

[0032] Figure 13 Shows the installation structure of the second embodiment of the mud collection device according to the present invention when the overflow pipe seat enters the base assembly.

[0033] Figure 14 and Figure 15 Are respectively the front view and top view of the mud collection tank in the second embodiment of the mud collection device according to the present invention.

[0034] Figure 16 Shows Figure 14 The three-dimensional view of the mud collection semi-tank body in the mud collection device shown.

[0035] Figures 17 to 19 Are respectively Figure 16 The front view, left view and top view of the mud collection semi-tank body shown.

[0036] Figures 20 to 22 Are respectively Figure 14 The front view, left view and top view of the connecting mechanism in the mud collection device shown.

[0037] Figure 23 Schematically shows the connection structure between the mud umbrella and the rotary seal assembly in the mud collection device according to the present invention.

[0038] Figure 24 Schematically shows the three-dimensional view of the mud umbrella.

[0039] Figure 25 is Figure 24 The front view of the mud umbrella shown in the figure.

[0040] The reference numerals in the figure are as follows:

[0041] 1 - Base assembly, 101 - Base housing, 102 - Base large bypass, 103, 104 - Base clamps, 105 - Base lifting lug, 106 - Base hydraulic cylinder, 107 - Base safety bolt, 108 - Base pin shaft, 109 - Base small bypass, 110 - Base limit block, 111 - Base limit bolt, 112 - Base pin shaft positioning plate;

[0042] 2 - Rotary seal assembly, 201 - Coffee cup gland, 202 - Coffee cup, 203 - Upper rubber core, 204 - Lubrication and cooling joint, 205 - Upper rotary seal, 206 - Bearing, 207 - Outer cylinder of bearing assembly, 208 - Inner cylinder of bearing assembly, 209 - Lower rotary seal, 210 - Lower rotary seal;

[0043] 3 - Anti - overflow pipe;

[0044] 4 - Mud collection tank (Embodiment 1), 401 - Mud collection tank body, 4011 - Outer plate of tank body, 4012 - Annular bottom plate, 4013 - Inner plate of tank body, 4014 - Reinforcing rib, 4015 - First diversion hole, 402 - Mounting bracket;

[0045] 4' - Mud collection tank (Embodiment 2), 41, 42 - Mud collection half - tank body, 4101 - Clamp connecting plate, 4102 - Clamp top screw block, 4103 - Half - tank support frame, 4104 - Half - tank bottom plate, 4105 - Second diversion hole, 4106 - Half - tank vertical plate, 4107 - Inner arc plate of half - tank, 4108 - Outer arc plate of half - tank, 4109 - Support member, 4110 - Auxiliary block, 4111 - Cut hole on outer arc plate of half - tank, 43, 44 - Connecting mechanism, 4301 - Connecting outer plate, 4302 - Outer plate gasket, 4303 - Bridging plate, 4304 - Connecting inner plate, 4305 - Inner plate gasket;

[0046] 5 - Mud umbrella, 51 - Mud umbrella baffle, 5101, 5102 - Baffle split body, 5103 - Connecting plate, 5104 - L - shaped gasket, 52 - Mud umbrella gasket, 53 - Cylindrical outer edge;

[0047] 6 - Deflector.

[0048] In this application, all the drawings are schematic drawings, only used to illustrate the principle of the present invention and not drawn to actual scale. Detailed implementation manners

[0049] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention. Therefore, the detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0050] Figure 1 is a main half-sectional view when the rotary control head is in the situation that the mud collection device according to the present invention is not installed and the rotary seal assembly 2 is seated into the base assembly 1. Figure 2 and Figure 3 are respectively the left view and top view when the rotary control head is in the situation that the mud collection device according to the present invention is not installed and the rotary seal assembly is seated into the base assembly. As Figures 1 to 3 shown, during the wellbore pressure control drilling operation, the rotary control head is installed at the uppermost end of a blowout preventer group (not shown). The rotary control head includes a rotary seal assembly 2 and a base assembly 1. The base assembly 1 includes a base housing 101, a base large bypass 102, base clamps 103, 104, a base lifting lug 105, a base hydraulic cylinder 106, a base safety bolt 107, a base pin 108, a base small bypass 109, a base limit block 110, a base limit bolt 111, a base pin positioning plate 112, etc. The rotary seal assembly 2 includes a bearing assembly 206, a rubber core, etc. Among them, the rotary seal assembly 2 of a double-rubber-core rotary control head generally includes a coffee cup gland 201, a coffee cup 202, an upper rubber core 203, a lubrication and cooling joint 204, an upper rotary seal 205, a bearing 206, an outer cylinder 207 of the bearing assembly, an inner cylinder 208 of the bearing assembly, a lower rotary seal 209, and a lower rubber core 210. The base clamps 103, 104 achieve locking and unlocking of the rotary seal assembly 2 or the overflow pipe 3 through the base hydraulic cylinder 106. These features and functions of the rotary control head are known in the art and will not be elaborated here.

[0051] Figure 4 is an installation schematic diagram when the overflow pipe 3 is seated into the base assembly 1 when the rotary control head is not installed with the mud collection device according to the present invention. The lower end of the overflow pipe 3 forms a fixed seal connection with the base housing 101.

[0052] As Figure 5As shown, the mud collection device for a rotary control head according to the present invention includes a mud collection tank 4, a mud umbrella 5, and a flow guide cover 6. The flow guide cover 6 is installed between the lower end of the drill floor and the mud collection tank 4. When the rotary seal assembly 2 is seated in the base assembly 1, the mud collection tank 4 is sleeved outside the rotary seal assembly 2, and the mud umbrella 5 is installed at the upper end of the rotary seal assembly 2. The mud slipping from the drill floor passes through the flow guide cover 6 and the mud umbrella 5 in sequence, and thus slides into the mud collection tank 4. At this time, the mud collection device is in the first working state. When the overflow pipe 3 is seated in the base assembly 1, the mud collection tank 4 is sleeved outside the overflow pipe 3, and the mud umbrella 5 is installed at the middle of the outer edge of the overflow pipe 3. A part of the mud slipping from the drill floor passes through the flow guide cover 6 and the mud umbrella 5 in sequence, and thus slides into the mud collection tank 4, and the other part directly descends from the lower end of the drill floor into the overflow pipe 3 and the wellbore. At this time, the mud collection device is in the second working state.

[0053] According to the present invention, the mud collection tank 4 can be configured as a circular collection tank structure, or can be configured as an annular tank structure formed by butting two semi-circular grooves. In the following different embodiments, the specific structure of the mud collection tank 4 will be introduced.

[0054] Embodiment 1:

[0055] In Embodiment 1, Figure 5 and Figure 6 show the installation structure of the mud collection device according to the present invention when the rotary seal assembly 2 is seated in the base assembly 1. As Figure 5 and Figure 6 shown, the mud collection tank 4 is configured as a circular collection tank structure, including a mud collection tank body 401 and a mounting bracket 402 for mounting the mud collection tank body 401. The mud collection tank body 401 is configured as an annular container with an upper opening. The mud collection tank body 401 is fixedly connected to the base housing 101 of the base assembly 1 through the mounting bracket 402.

[0056] In one embodiment, the mounting bracket 402 is installed on the fixed connecting piece of the base housing 101. The fixed connecting piece can be, for example, parts directly connected, welded or bolted to the base housing 103 such as the base housing 101, the base large bypass 102 and the base small bypass 109. Preferably, the mud collection tank 4 is installed on the base small bypass 109 of the base housing 101 through the mounting bracket 402.

[0057] Figure 8 and Figure 9 are respectively the front view and the top view of the mud collection tank 4 in Embodiment 1. As Figure 8 and Figure 9As shown, the mud collection tank body 401 includes a cylindrical outer tank plate 4011, an inner tank plate 4013 concentrically arranged inside the outer tank plate 4011, and an annular bottom plate 4012 for connecting the outer tank plate 4011 and the inner tank plate 4013. The lower end surfaces of the outer tank plate 4011 and the inner tank plate 4013 are flush, and are respectively fixedly connected to the radial edges of the upper end surface of the annular bottom plate 4012. Thus, a circular collection tank is formed. The internal space of the cylindrical inner tank plate 4013 of the mud collection tank 4 is used for the rotary seal assembly 2 or the overflow prevention pipe 3 to pass through. The height of the outer tank plate 4011 is greater than the height of the inner tank plate 4013. The outer diameter of the mud umbrella baffle 51 (see the following introduction) in the mud umbrella 5 is smaller than the diameter of the outer tank plate 4011 and larger than the diameter of the inner tank plate 4013. And the diameter of the inner tank plate 4013 is greater than the maximum outer diameter of the rotary seal assembly 2. A certain height difference is maintained between the annular bottom plate 4012 and the base clamps 103 and 104. This height difference can not only prevent the annular bottom plate 4012 from colliding with the base safety bolt 107, etc., but also allow the lubrication and cooling pipeline to be inserted and removed within this height difference range, which is very convenient and fast.

[0058] Figure 10 is Figure 8 a cross-sectional view along line A-A in. As Figure 8 and Figure 10 shown, the annular bottom plate 4012 is fixedly connected to the mounting bracket 402. The annular bottom plate 4012 is perpendicular to the mounting bracket 402, and the mounting bracket 402 is on one side of the annular bottom plate 4012. Mounting holes are provided at a position near the lower end of the mounting bracket 402 for fixedly connecting with the base small bypass 109 through a flange structure.

[0059] In this embodiment, as Figure 9 shown, a first diversion hole 4015 is provided on the annular bottom plate 4012. The first diversion hole 4015 is used to connect a mud diversion pipe (not shown) to divert the mud collected by the mud collection device.

[0060] According to the present invention, a plurality of radially extending reinforcing ribs 4014 are provided between the outer tank plate 4011 and the inner tank plate 4013. The plurality of reinforcing ribs 4014 are evenly distributed in the circumferential direction. In the Figure 9 shown embodiment, 4 circumferentially evenly distributed reinforcing ribs 1014 can be provided. In one embodiment, the reinforcing rib 4014 includes a first vertical rod, a second vertical rod extending vertically and a transverse rod extending radially. The first vertical rod is closely attached to the inner wall surface of the outer tank plate 4011, the second vertical rod is closely attached to the outer wall surface of the inner tank plate 4013, and the first vertical rod is higher than the second vertical rod. The transverse rod is connected between the first vertical rod and the second vertical rod and is at an upper position near the second vertical rod.

[0061] In one embodiment, the annular groove reinforcing rib 4014 can be welded by components such as rectangular pipes, channel steels or angle steels. The reinforcing rib 4014 can effectively reinforce, support and stabilize the annular groove outer plate 4011, the annular groove bottom plate 4012 and the annular groove inner plate 4013.

[0062] According to the present invention, as Figure 24 and Figure 25 shown, the mud umbrella 5 is configured as an annular mud umbrella baffle 51. The mud umbrella baffle 51 includes an annular baffle body and a cylindrical outer edge 53 connected to the radial end face of the annular baffle body. Thus, the cylindrical outer edge 53 is formed as a downwardly folded lip. This is more conducive to the mud entering the mud collection tank 4 and avoiding splashing. At a position of the mud umbrella baffle 51 close to the inner hole, a plurality of circumferentially evenly distributed mounting holes are provided for fasteners to pass through to mount the mud umbrella 5.

[0063] In one embodiment, the mud umbrella baffle 51 is configured as a split structure, including docking-connected baffle splits 5101 and 5102, and the baffle splits 5101 and 5102 have the same structure. Connection plates 5103 are respectively fixed to the docking surfaces of the baffle splits. The two baffle splits 5101 and 5102 are fixedly connected through the connection plates 5013 to form the annular mud umbrella baffle 51. The connection plate 5013 is configured as an L-shaped plate. The long side of the L-shaped plate extends radially along the baffle split and is welded to the baffle split 5101. The short side of the L-shaped plate is located outside the cylindrical outer edge 53 and extends vertically, and is welded to the cylindrical outer edge 53. The baffle split 5101 and the baffle split 5102 are docked through the corresponding connection plates 5013 and are tightly connected through fastening bolts to be connected as a whole. Thus, the annular mud umbrella baffle 51 is formed.

[0064] In this embodiment, an L-shaped gasket 5014 is provided between the L-shaped plates corresponding to the baffle splits 5101 and 5102. This structure of the mud umbrella 5 is not only convenient for installation but also can effectively block the mud.

[0065] According to the present invention, the fairing 6 is an inverted conical cylinder, and the fairing 6 can be made of waterproof canvas. After the canvas is unfolded, it is a sector ring structure. The upper end is connected to the lower end of the drill floor through a pull rope, and the lower end is connected to the annular bottom plate 4012 of the mud collection tank 4 through a pull rope.

[0066] When the rotary seal assembly 2 of the rotary control head is seated in the base assembly 1 (the mud collection device is in the first state), as Figure 6 shown, the mud umbrella 5 is installed at the upper end of the rotary seal assembly 2. The mud collection tank 4 is sleeved outside the rotary seal assembly 2 and is fixedly installed on the base housing 101 through the mounting bracket 402. As Figure 23As shown, a mud umbrella gasket 52 is provided between the upper end of the rotary seal assembly 2 and the mud umbrella baffle 51, and fastening screws are installed in the mounting holes of the mud umbrella baffle 51. The threaded ends of the fastening screws are installed into the mounting holes of the coffee cup gland 201 of the rotary seal assembly 2, thereby forming a fixed connection with the coffee cup gland 201 of the rotary seal assembly 2. Thus, the mud umbrella 5 is fixedly installed at the upper end position of the rotary seal assembly 2. In this working state, the mud slipping from the drill floor passes through the flow guide cover 6 and the mud umbrella 5 in sequence, and then slips into the mud collection tank 4, effectively preventing the mud from entering the gap between the rotary seal assembly 2 and the mud collection tank 4, which can effectively improve the working environment of the rotary seal assembly 2.

[0067] When the overflow pipe 3 is seated into the base assembly 1 (the mud collection device is in the second state), as Figure 7 shown, the mud umbrella 5 is installed in the middle of the outer edge of the overflow pipe 3. The mud collection tank 4 is sleeved on the outside of the overflow pipe 3 and is fixedly installed on the base housing 101 through the mounting bracket 402. In one embodiment, for example, a circular plate for cooperating with the mud umbrella 5 can be welded in the middle of the overflow pipe 3. The mud umbrella 3 is fixedly installed on the circular plate through fastening bolts. In this working state, part of the mud slipping from the drill floor passes through the flow guide cover 6 and the mud umbrella 5 in sequence and then slips into the mud collection tank 4, and the other part directly descends from the lower end of the drill floor into the overflow pipe 3 and the wellbore. Effectively preventing the mud from entering the gap between the overflow pipe 3 and the mud collection tank 4, which can effectively improve the working environment of the rotary seal assembly 2.

[0068] Embodiment 2:

[0069] In Embodiment 2, Figure 11 and Figure 12 show the installation structure of the mud collection device according to the present invention when the rotary seal assembly 2 is seated into the base assembly 1. As Figure 11 and Figure 12 shown, the mud collection tank 4' is configured to include two mud collection half-tanks 41, 42 with the same structure. As Figure 14 and Figure 15 are respectively the front view and top view of the mud collection half-tank of the mud collection device in Embodiment 2. The two mud collection half-tanks 41, 42 are connected through two connection mechanisms 43, 44 with the same structure. The mud collection half-tank is configured as a semi-circular ring-shaped container with an open upper part, and an installation part is provided at the bottom of the semi-circular ring-shaped container. The mud collection tank 4' is fixedly connected to the base clamps 103, 104 of the base assembly 1 through the installation part.

[0070] As Figures 16 to 19As shown, the mud collection semi-tank body is configured to include a semi-tank inner arc plate 4107, a semi-tank outer arc plate 4108, a semi-tank bottom plate 4104 for connecting the semi-tank inner arc plate 4107 and the semi-tank outer arc plate 4108, and two semi-tank vertical plates 4106, thereby forming a semi-circular annular space for accommodating mud between the semi-tank inner arc plate 4107, the semi-tank outer arc plate 4108, and the semi-tank vertical plate 4106. The outer wall surface of the semi-tank outer arc plate 4108 is connected to the connecting mechanism, so that the two mud collection semi-tank bodies 41 and 42 are connected, and a through hole for the rotary seal assembly 1 or the overflow pipe 3 to pass through is formed between the semi-tank inner arc plates 4107.

[0071] In this embodiment, as Figure 16 shown, a second diversion hole 4105 is provided on the semi-tank bottom plate 4104. The second diversion hole 4105 is used to connect a mud diversion pipe (not shown) to divert the mud collected by the mud collection device.

[0072] Support members 4109 and auxiliary blocks 4110 are provided inside the mud collection semi-tank body. The support members 4109 are arranged at the circumferential middle position inside the mud collection semi-tank bodies 41 and 42, and the auxiliary blocks 4110 are arranged on the inner wall of the semi-tank outer arc plate 4108 and are close to the semi-tank vertical plate 4106. Preferably, the support members 4109 are arranged to have the same structure as the reinforcing ribs 4014. The auxiliary blocks 4110 are closely attached to the inner wall of the semi-tank outer arc plate 4108 in the vertical direction and are integrally formed by welding. The height of the auxiliary blocks 4110 is set to be slightly lower than the height of the semi-tank outer arc plate 4108. The auxiliary blocks 4110 can be welded by using members such as rectangular pipes, channel steels, or angle steels. The support members 4109 and the auxiliary blocks 4110 can effectively strengthen and stabilize the semi-tank inner arc plate 4107, the semi-tank outer arc plate 4108, the semi-tank bottom plate 4104, and the semi-tank vertical plate 4106.

[0073] According to the present invention, the installation part is configured to include a semi-tank support frame 4103 fixedly connected to the lower end of the semi-tank bottom plate 4104, and a clamp connection plate 4101 fixedly connected to the lower end of the semi-tank support frame 4103. The clamp connection plate 4101 is used for fixedly connecting with the base clamps 103 and 104 in the base assembly 1. During installation, the corresponding clamp connection plates 4101 of the mud collection semi-tank bodies 41 and 42 are respectively fixed to the upper ends of the base clamps 103 and 104 by bolts, and the bolts are connected to the threaded holes for connecting the base lifting lugs 105. A clamp top screw block 4102 is welded to the outer edge of the clamp connection plate 4101 and the base clamps 103 and 104 are held by the top screws to prevent the clamp connection plate 4101 from rotating.

[0074] In this embodiment, the semi-groove support frame 4103 causes a height difference between the slurry collection semi-groove body 41 and the slurry collection semi-groove body 42 relative to the base clamp 103 and the base clamp 104. This height difference can not only prevent the slurry collection tank 4' from colliding with the base safety bolt 107, etc., but also allow the lubrication and cooling pipeline to be inserted and removed within this height difference range.

[0075] Figures 20 to 22 They are respectively the front view, left view and top view of the connecting mechanism 43 (connecting mechanism 44) in the slurry collection device. As Figures 20 to 22 shown, the connecting mechanism 43 includes a connecting outer plate 4301 and a connecting inner plate 4304 that are configured to be arc-shaped, and a bridging plate 4303 for connecting the connecting outer plate 4301 and the connecting inner plate 4304. In one embodiment, the bridging plate 4303 is a channel steel structure, and one end of the bridging plate 4303 is fixedly connected to the inner edge of the connecting outer plate 4301, and the other end is fixedly connected to the outer edge of the connecting inner plate 4304. The connecting outer plate 4301 is used to be fixedly connected to the outer wall surface of the semi-groove outer arc plate 4108, and the connecting inner plate 4304 forms a clearance fit with the outer wall of the semi-groove inner arc plate 4107.

[0076] In one embodiment, a plurality of mounting grooves extending inward in the circumferential direction are provided on both circumferential sides of the connecting outer plate 4301, and the plurality of mounting grooves are evenly spaced apart in the vertical direction. Preferably, the connecting outer plate 4301 is fixedly connected to the semi-groove outer arc plate 4108 by bolts. For example, bolt holes can be provided on the auxiliary block 4110, and corresponding through holes are provided on the semi-groove outer arc plate 4108. The connecting outer plate 4301 is fixedly connected to the semi-groove outer arc plate 4108 by passing bolts through the mounting grooves, through holes, and bolt holes in sequence. In order to ensure the connection tightness and stability between the connecting outer plate 4301 and the semi-groove outer arc plate 4108, an outer plate gasket 4302 is provided between the outer wall surfaces of the connecting outer plate 4301 and the semi-groove outer arc plate 4108.

[0077] The connecting inner plate 4304 forms a clearance fit with the semi-groove inner arc plate 4107, and an inner plate gasket 4305 is provided between the outer wall of the connecting inner plate 4304 and the semi-groove inner arc plate 4107. As Figure 20As shown, a groove is provided on the lower end surface of the bridging plate 4303. At the connection between the semi-groove outer arc plate 4108 and the semi-groove vertical plate 4106, a part of the space is cut vertically on the semi-groove outer arc plate 4108 to form the semi-groove outer arc plate cut hole 4111. During installation, the connection mechanisms 43 and 44 can be horizontally inserted into and withdrawn from the mud collection semi-groove bodies 41 and 42, and the mud collection semi-groove body 41 and the mud collection semi-groove body 42 can be adaptively installed into the groove, thereby effectively ensuring the sealing between the docking surfaces of the mud collection semi-groove body 41 and the mud collection semi-groove body 42 and effectively ensuring the mud blocking effect. During the process of the mud collection tank 4' collecting mud, a part of the mud sliding down from the upper part directly falls into the mud collection semi-grooves 41 and 42, and the other part slides onto the upper end surface of the bridging plate 4303 and then slides into the mud collection semi-grooves 41 and 42.

[0078] According to the present invention, in the second embodiment, the mud umbrella 5 and the deflector 6 are the same as those in the first embodiment.

[0079] When the rotary seal assembly 2 of the rotary control head is seated in the base assembly 1 (the mud collection device is in the first state), as Figure 12 shown, the mud umbrella 5 is installed at the upper end of the rotary seal assembly 2. The mud collection tank 4' is sleeved outside the rotary seal assembly 2 and is fixedly connected to the base clamps 103 and 104 of the base assembly 1 through the installation part. The mud umbrella 5 is fixedly installed at the upper end position of the rotary seal assembly 2, and the installation method of the mud umbrella 5 is the same as that in the first embodiment. In this working state, the mud sliding down from the drill floor passes through the deflector 6 and the mud umbrella 5 in sequence, and thus slides into the mud collection tank 4', effectively avoiding the mud from entering the gap between the rotary seal assembly 2 and the mud collection tank 4, which can effectively improve the working environment of the rotary seal assembly 2.

[0080] When the overflow prevention pipe 3 is seated in the base assembly 1 (the mud collection device is in the second state), as Figure 13 shown, the mud umbrella 5 is installed at the middle position of the outer edge of the overflow prevention pipe 3. The mud collection tank 4' is sleeved outside the overflow prevention pipe 3 and is fixedly connected to the base clamps 103 and 104 of the base assembly 1 through the installation part. In this working state, a part of the mud sliding down from the drill floor passes through the deflector 6 and the mud umbrella 5 in sequence, and thus slides into the mud collection tank 4', and the other part directly descends from the lower end of the drill floor into the overflow prevention pipe 3 and the wellbore. Effectively avoiding the mud from entering the gap between the overflow prevention pipe 3 and the mud collection tank 4', which can effectively improve the working environment of the rotary seal assembly 2.

[0081] The mud collection device for a rotary control head according to the present invention can be applied to all working conditions of the rotary control head. It can effectively collect the mud slipping inside the drill string or on the drill floor, greatly improving the upper sealing working environment of the bearing assembly of the rotary control head and effectively avoiding the problems of equipment safety in the drilling process and environmental pollution. The mud collection device enables the mud slipping on the drill floor to pass through the flow guide cover 6 and the mud umbrella 5 in sequence, and then slip into the mud collection tank 4, effectively preventing the mud from entering the rotary seal assembly 2 or the gap between the overflow pipe 3 and the mud collection tank 4, thus effectively improving the working environment of the rotary seal assembly 2, which is very beneficial to extending the service life of the sealing structure of the rotary control head. In addition, the mud collection tank 4 is convenient to install, does not affect other operations, occupies a small space, and has a high mud collection efficiency.

[0082] In the description of the present invention, it should be understood that the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more unless otherwise specifically defined.

[0083] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected with", "fixed" and other terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0084] In addition, the description with reference to terms such as "an embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0085] Finally, it should be noted that the above are only preferred embodiments of the present invention and do not constitute any limitation to the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A mud collection device for a rotary control head, characterized in that, The rotary control head includes a base assembly, a rotary seal assembly, and an anti-overflow pipe. The mud collection device includes: A mud collection trough, which is configured to include a mud collection trough body and a mounting bracket for mounting the mud collection trough body. The mud collection trough body is configured as an annular container with an upper opening, and the mud collection trough body is fixedly connected to the base housing of the base assembly through the mounting bracket; A mud umbrella, which is configured as an annular mud umbrella baffle. The mud umbrella baffle includes an annular baffle body and a cylindrical outer edge connected to the radial end face of the annular baffle body. The mud umbrella baffle is configured to include two butted baffle parts, and connecting plates are respectively fixed on the butting surfaces of the baffle parts. The two baffle parts are fixedly connected through the connecting plates to form the mud umbrella baffle; and A deflector, which is installed between the lower end of the drill floor and the mud collection trough; the deflector is configured as an inverted conical cylinder and is made of waterproof canvas; Wherein, in the first state, the rotary seal assembly is seated in the base assembly, the mud collection trough is sleeved outside the rotary seal assembly, the mud umbrella is installed at the upper end of the rotary seal assembly, and the mud slipping from the drill floor sequentially passes through the deflector and the mud umbrella and then slips into the mud collection trough; In the second state, the anti-overflow pipe is seated in the base assembly, the mud collection trough is sleeved outside the anti-overflow pipe, the mud umbrella is installed in the middle of the outer edge of the anti-overflow pipe. A part of the mud slipping from the drill floor sequentially passes through the deflector and the mud umbrella and then slips into the mud collection trough, and the other part directly descends from the lower end of the drill floor into the anti-overflow pipe and the wellbore; The mud collection trough body includes a cylindrical trough outer plate, a trough inner plate concentrically arranged inside the trough outer plate, and an annular bottom plate for connecting the trough outer plate and the trough inner plate. The height of the trough outer plate is greater than the height of the trough inner plate, and the outer diameter of the mud umbrella baffle is smaller than the diameter of the trough outer plate and larger than the diameter of the trough inner plate. The annular bottom plate is fixedly connected to the mounting bracket, and the inner space of the trough inner plate is used for the rotary seal assembly or the anti-overflow pipe to pass through.

2. The mud collection device for a rotary control head according to claim 1, characterized in that, A first diversion hole is provided on the annular bottom plate, and the first diversion hole is used to connect a mud diversion pipe to discharge the collected mud.

3. The mud collection device for a rotary control head according to claim 1, characterized in that, A plurality of radially extending reinforcing ribs are provided between the trough outer plate and the trough inner plate, and the plurality of reinforcing ribs are evenly distributed in the circumferential direction.

4. The mud collection device for a rotary control head according to claim 2 or 3, characterized in that, The mud collection trough is configured to include two identical mud collection half troughs, and the two mud collection half troughs are connected through two identical connection mechanisms. The mud collection half trough is configured as a semi-annular container with an upper opening, and an installation part is provided at the bottom of the semi-annular container. The mud collection trough is fixedly connected to the base clamp of the base assembly through the installation part.

5. The mud collection device for a rotary control head according to claim 4, characterized in that, The slurry collection semi-tank body is configured to include a semi-tank inner arc plate, a semi-tank outer arc plate, a semi-tank bottom plate for connecting the semi-tank inner arc plate and the semi-tank outer arc plate, and two semi-tank vertical plates, so as to form a semi-circular annular space for accommodating slurry between the semi-tank inner arc plate, the semi-tank outer arc plate and the semi-tank vertical plates. The outer wall surface of the semi-tank outer arc plate is connected to the connection mechanism, so that the two slurry collection semi-tank bodies are connected, and a through hole for the rotary seal assembly or the overflow prevention pipe to pass through is formed between the semi-tank inner arc plates.

6. The mud collection device for a rotary control head according to claim 5, wherein, A second diversion hole is provided on the semi-tank bottom plate, and the second diversion hole is used to connect a slurry diversion pipe to discharge the collected slurry.

7. The mud collection device for a rotary control head according to claim 6, wherein, A support member and an auxiliary block are provided inside the slurry collection semi-tank body. The support member is arranged at the circumferential middle position inside the slurry collection semi-tank body, and the auxiliary block is arranged on the inner wall of the semi-tank outer arc plate and is close to the semi-tank vertical plate.

8. The mud collection device for a rotary control head according to claim 7, characterized in that, The installation part is configured to include a semi-tank support frame fixedly connected to the lower end of the semi-tank bottom plate, and a clamp connecting plate fixedly connected to the lower end of the semi-tank support frame. The clamp connecting plate is used for fixedly connecting with the base clamp.

9. The mud collection device for a rotary control head according to claim 8, characterized in that, The connection mechanism includes a connection outer plate and a connection inner plate configured to be arc-shaped, and a bridging plate for connecting the connection outer plate and the connection inner plate. The connection outer plate is fixedly connected to the outer wall surface of the semi-tank outer arc plate, and the connection inner plate forms a clearance fit with the outer wall of the semi-tank inner arc plate.

10. The mud collection device for a rotary control head according to claim 9, characterized in that, An outer plate gasket is provided between the connection outer plate and the outer wall surface of the semi-tank outer arc plate, and an inner plate gasket is provided between the connection inner plate and the outer wall of the semi-tank inner arc plate.

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