Slurry collection and cooling water circulation system

Abstract

The invention relates to a slurry collection and cooling water circulation system which comprises a liquid storage tank arranged on an expansion joint and used for collecting slurry and storing cooling water, and a floater liquid level sensing assembly is arranged in the liquid storage tank and connected with a moon pool pneumatic control assembly in a moon pool platform area. The floater liquid level sensing assembly is used for switching when the liquid level in the liquid storage tank reaches a set liquid level so as to enable the moon pool pneumatic control assembly to obtain an electric signal, and the moon pool pneumatic control assembly is used for submitting the electric signal to a moon pool central operation console in a moon pool platform area; the moon pool central operation console is used for controlling sewage in the liquid storage tank to be recycled to a moon pool sewage tank in the moon pool platform area according to the electric signal, and is also used for controlling clear water in the moon pool sewage tank to be injected into the liquid storage tank. Sewage in the liquid storage tank can be recycled to the moon pool sewage tank, so that the problem of marine environment pollution caused by overflow slurry is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of marine engineering, and in particular relates to a mud collection and cooling water circulation system. Background Art

[0002] In the jacking force riser system, the expansion joint realizes the motion compensation between the mobile drilling platform and the riser by the relative reciprocating motion of the expansion joint inner tube and the expansion joint outer tube. An expansion joint sealing packing is also arranged between the expansion joint outer tube and the expansion joint inner tube. Under normal working conditions, the expansion joint sealing packing is driven by external hydraulic pressure to deform, hold the expansion joint inner tube tightly, and realize sealing.

[0003] On the one hand, the expansion joint sealing packing is usually unable to completely scrape off the mud on the outer wall of the expansion joint inner tube, and a small amount of mud is attached to the outer wall of the expansion joint inner tube, which will form sewage mud with the cooling lubricating water. On the other hand, when the expansion joint sealing packing has more wear or eccentric wear than expected, the liquid in the wellbore will seep out from the sealing gap of the expansion joint sealing packing; if the expansion joint sealing packing is worn too much, or the internal pressure rises sharply but the driving pressure is not adjusted in time, the internal mud will seep out from the sealing gap of the expansion joint sealing packing.

[0004] Whether it is a small amount of mud on the outer wall of the inner tube of the expansion joint or a large amount of mud seeping out due to seal failure or pressure change, it will cause damage to the marine environment. Summary of the invention

[0005] In order to solve all or part of the above problems, the present invention aims to provide a mud collection and cooling water circulation system. The mud collection and cooling water circulation system of the present invention avoids direct discharge of overflow mud into the sea, thereby reducing pollution to the marine environment.

[0006] According to one aspect of the present invention, a mud collection and cooling water circulation system is provided, comprising a liquid storage tank arranged on a telescopic joint for collecting mud and storing cooling water, a float liquid level sensing assembly is arranged in the liquid storage tank, the float liquid level sensing assembly is connected to the moon pool air control assembly in the moon pool platform area, the float liquid level sensing assembly is used to switch when the liquid level in the liquid storage tank reaches a set liquid level so that the moon pool air control assembly obtains an electrical signal, the moon pool air control assembly is used to submit the electrical signal to the moon pool central operation console in the moon pool platform area; the moon pool central operation console is used to control the sewage in the liquid storage tank to be recovered to the moon pool sewage tank in the moon pool platform area according to the electrical signal, and the moon pool central operation console is also used to control the clean water in the moon pool sewage tank to be injected into the liquid storage tank.

[0007] Furthermore, the float liquid level sensing assembly includes an outer shell body arranged in the liquid storage tank and having an opening at the lower end, a float core is arranged in the outer shell body, a lever-type air valve is fixed in the outer shell body above the float core, the float core is arranged to be able to float under the action of the liquid in the liquid storage tank, the lever-type air valve is arranged to be in a normally open state, and when the liquid level in the liquid storage tank reaches a set liquid level, the float core can act on the lever-type air valve to switch the lever-type air valve to a closed state; the moon pool air control assembly is used to obtain the electrical signal after the lever-type air valve is switched to a closed state.

[0008] Furthermore, an open bottom support is provided at the lower end of the outer shell, and the float core is provided on the open bottom support; a top panel is provided at the upper end of the float core, and the float core cooperates with the lever-type air valve through the top panel; a fixed valve bracket is fixedly connected to the outer shell above the float core, and the lever-type air valve is fixedly connected to the fixed valve bracket; a liquid level indicator rod is provided on the top panel, and the liquid level indicator rod is used to indicate the liquid level of the liquid in the liquid storage tank; a limit liquid level visual mark is provided on the liquid level indicator rod, and when the liquid level in the liquid storage tank reaches the set liquid level, the liquid level is located at the limit liquid level visual mark.

[0009] Furthermore, the moon pool air control assembly includes an air pressure control relay, one end of the lever type air valve is connected to the air valve air inlet path, the other end of the lever type air valve is connected to the air valve air return path, the air pressure control relay is arranged on the air valve air return path, the air valve air inlet path is connected to the air source, the air pressure control relay can obtain the electrical signal after the lever type air valve is switched to a closed state, and after the air pressure control relay obtains the electrical signal, the electrical signal is submitted to the moon pool central operation console through an electronic control bus.

[0010] Furthermore, the moon pool gas control assembly also includes an air intake valve, a dryer and a gas processor. The air intake path of the air valve is connected to the air source through a platform air supply pipe. The air intake valve, the dryer and the gas processor are all arranged on the platform air supply pipe.

[0011] Furthermore, the air valve inlet circuit is connected to the air inlet end of the two-position two-way electromagnetic reversing valve, the air outlet end of the two-position two-way electromagnetic reversing valve is connected to the control end of the pneumatic sewage pump through the pneumatic pump power air circuit, the two-position two-way electromagnetic reversing valve is set to be in a normally open state, and the moon pool central operation console is used to control the two-position two-way electromagnetic reversing valve to switch to a closed state after receiving the electrical signal; the moon pool central operation console is also used to control the closing time of the two-position two-way electromagnetic reversing valve to switch to the closed state; a sewage recovery port is provided on the liquid storage tank, and an overflow mud return inlet is provided on the moon pool sewage tank, the sewage recovery port is connected to the overflow mud return inlet through a sewage recovery liquid circuit, and the pneumatic sewage pump is arranged on the sewage recovery liquid circuit.

[0012] Furthermore, a cooling water inlet is provided on the liquid storage tank, and a clean water inlet is provided on the moon pool sewage tank, the cooling water inlet is connected with the clean water inlet through a clean water injection liquid path, a clean water injection air control valve is provided on the clean water injection liquid path, the clean water injection air control valve is set to a cut-off state, and the clean water injection air control valve is connected to the valve air inlet path through a two-position four-way electromagnetic reversing valve, and the two-position four-way electromagnetic reversing valve is controlled by the moon pool central operation console; the moon pool sewage tank is arranged above the liquid storage tank, so that after the clean water injection air control valve is switched to the on state, the liquid in the moon pool sewage tank can flow into the liquid storage tank under the action of gravitational potential energy.

[0013] Furthermore, the clean water injection air-controlled valve has two control ports, wherein one of the control ports of the clean water injection air-controlled valve is connected to one of the working ports of the two-position four-way solenoid reversing valve through a first control air circuit, and the other control port of the clean water injection air-controlled valve is connected to the other working port of the two-position four-way solenoid reversing valve through a second control air circuit, and the air inlet of the two-position four-way solenoid reversing valve is connected to the air inlet circuit of the air valve.

[0014] Furthermore, the clean water injection port is arranged in the middle of the moon pool sewage tank, the moon pool sewage tank is connected with a clean water injection pipe and a sewage pipe, the sewage pipe is arranged at the bottom of the moon pool sewage tank, the clean water injection pipe is provided with a water valve, and the sewage pipe is provided with a sewage valve; a pressure gauge is provided on the sewage recovery liquid circuit.

[0015] Furthermore, a control knob for a two-position, two-way electromagnetic reversing valve and a control knob for a two-position, four-way electromagnetic reversing valve are provided on the moon pool central operation console; an electronic liquid level gauge is provided in the moon pool sewage tank, and the electronic liquid level gauge is connected to the moon pool central operation console, and the electronic liquid level gauge is used to be triggered after the liquid level in the moon pool sewage tank reaches a set liquid level, so as to send an alarm signal to the moon pool central operation console.

[0016] It can be seen from the above technical solution that the mud collection and cooling water circulation system provided by the present invention has the following beneficial effects:

[0017] When the mud between the expansion joint inner tube and the expansion joint sealing packing cannot be completely scraped off, or there is a sealing failure at the expansion joint sealing packing, the liquid storage barrel can collect the overflow mud in the first place, thereby avoiding the overflow mud from being directly discharged into the sea and reducing the pollution to the marine environment;

[0018] The sewage in the control tank can be recycled to the moon pool sewage tank, which also avoids the problem of marine environment pollution caused by overflow mud; the clean water in the moon pool sewage tank can also be injected into the storage tank, thereby playing the role of cleaning, cooling and lubricating the expansion joint sealing packing;

[0019] The present invention uses a lever-type gas valve to feedback the liquid level signal, and there is no electrical component on the expansion joint body, thereby improving the reliability of signal transmission in the expansion joint area with complex working conditions, and also avoiding the safety risks caused by electrical components in areas with high explosion-proof requirements;

[0020] The volume of the moon pool sewage tank of the present invention is larger than that of the liquid storage tank. When a large amount of sludge overflows, the moon pool sewage tank has sufficient volume for collecting the overflow sludge, thereby greatly improving the sludge collection capacity and further reducing the risk of pollution.

[0021] The two-position two-way solenoid reversing valve and the two-position four-way solenoid reversing valve of the present invention are both manual and electric dual-mode control elements, and the platform operator can manually control the relevant controller when he deems it necessary;

[0022] Under the condition that the moon pool sewage tank is not connected to an external water source, the arrangement of the present invention can realize the recycling of lubrication and cooling water, thereby ensuring that the sealing packing of the expansion joint is always in a cooling and lubricating state, avoiding the waste of water resources caused by the constant opening of cooling water, and avoiding the pollution caused by the mixing of cooling water with dirty mud into the marine environment;

[0023] The arrangement of the present invention enables the cooling water and overflow mud recovery to form a set of self-circulating and self-balancing closed system, which can perform the self-purification work of the packing coolant without human intervention for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A system schematic diagram of a mud collection and cooling water circulation system according to an embodiment of the present invention;

[0025] Figure 2 It is a cross-sectional view of the expansion joint area;

[0026] Figure 3Schematic diagram of a float liquid level sensing assembly according to an embodiment of the present invention;

[0027] Figure 4 It is a schematic diagram of the moon pool air control assembly and the moon pool sewage tank;

[0028] Figure 5 This is a schematic diagram of the central operating console of the moon pool;

[0029] The accompanying drawings are marked as follows: 1. Central operating console of moon pool; 2. Gas control assembly of moon pool; 3. Circulation system assembly of moon pool; 4. Temporary mud storage barrel assembly; 5. U-shaped suspended pipeline area; 6. Drain pipe; 7. Clean water injection pipe; 8. Platform air supply pipe; 9. First control air circuit; 10. Second control air circuit; 11. Power air circuit of pneumatic pump; 12. Air inlet circuit of air valve; 13. Air return circuit of air valve; 14. Sewage recovery liquid circuit; 15. Clean water injection liquid circuit; 16. Electric control bus; 101. Status indicator light; 102. Light group test button; 103. Control knob; 104. Operating console; 201. Air inlet valve; 202. Dryer; 203. Gas processor; 204. Two-position four-way solenoid reversing valve; 205. Two-position two-way solenoid reversing valve; 206. Air pressure control relay; 30 1. Pressure gauge; 302. Pneumatic sewage pump; 303. Overflow mud return inlet; 304. Platform clean water inlet; 305. Water valve; 306. Electronic liquid level gauge; 307. Moon pool sewage tank; 308. Drain valve; 309. Clean water injection port; 310. Clean water injection gas control valve; 401. Telescopic joint outer cylinder; 402. Telescopic joint sealing packing; 403. Telescopic joint inner cylinder; 404. Liquid storage tank; 405. Mud cooling water mixture; 406. Float liquid level sensing assembly; 407. Sewage recovery port; 408. Cooling water injection port; 4061. Outer shell; 4062. Fixed valve bracket; 4063. Lever air valve; 4064. Liquid level indicator rod; 4065. Extreme liquid level visual mark; 4066. Top panel; 4067. Float core; 4068. Open bottom support. DETAILED DESCRIPTION

[0030] In order to better understand the purpose, structure and function of the present invention, the following is a further detailed description of a mud collection and cooling water circulation system of the present invention in conjunction with the accompanying drawings.

[0031] like Figure 1As shown, it shows a mud collection and cooling water circulation system of an embodiment of the present invention, which mainly includes a moon pool central operation console 1, a moon pool air control assembly 2 and a moon pool circulation system assembly 3 placed in the moon pool platform area; a mud temporary storage barrel assembly 4 integrated in the telescopic joint and a UU-shaped suspended pipeline area 5 connecting the two devices, wherein the platform air source is connected to the moon pool air control assembly 2, the platform water source is connected to the moon pool circulation system assembly 3, and the overflow mud is connected to the platform mud system by the sewage pipe 6; the mud temporary storage barrel assembly 4 mainly includes a liquid storage tank 404 for collecting mud and storing cooling water.

[0032] Specifically, the mud collection and cooling water circulation system includes a liquid storage tank 404 arranged on the telescopic joint for collecting mud and storing cooling water, a float liquid level sensing assembly 406 is arranged in the liquid storage tank 404, the float liquid level sensing assembly 406 is connected to the moon pool air control assembly 2 in the moon pool platform area, the float liquid level sensing assembly 406 is used to switch when the liquid level in the liquid storage tank 404 reaches the set liquid level so that the moon pool air control assembly 2 obtains an electrical signal, and the moon pool air control assembly 2 is used to submit the electrical signal to the moon pool central operation console 1 in the moon pool platform area; the moon pool central operation console 1 is used to control the sewage in the liquid storage tank 404 to be recovered to the moon pool sewage tank 307 in the moon pool platform area according to the electrical signal, and the moon pool central operation console 1 is also used to control the clean water in the moon pool sewage tank 307 to be injected into the liquid storage tank 404.

[0033] Specifically, the liquid storage barrel is integrated into the expansion joint body. When the internal pressure seal between the expansion joint inner tube 403 and the expansion joint sealing packing 402 achieved by relying on the contact pressure of the flexible body surface cannot completely scrape off the mud on the outer wall of the expansion joint inner tube 403, or there is a sealing failure at the expansion joint sealing packing 402, the liquid storage barrel can collect the overflow mud in the first time, thereby avoiding the overflow mud from being directly discharged into the sea and reducing the pollution to the marine environment.

[0034] As more and more mud is collected in the liquid storage barrel, the liquid level of the mud cooling water mixture 405 in the liquid storage barrel gradually increases. When the liquid level of the mud cooling water mixture 405 in the liquid storage tank 404 reaches the set liquid level, the float liquid level sensing assembly 406 in the liquid storage barrel is switched, and the float liquid level sensing assembly 406 switches the moon pool gas control assembly 2 to obtain an electrical signal. Therefore, this embodiment realizes the switching of the liquid level signal into an electrical signal through the float liquid level sensing assembly 406 and the moon pool gas control assembly 2.

[0035] After the moon pool air control assembly 2 receives the electrical signal, it submits the electrical signal to the moon pool central operation console 1; the moon pool central operation console 1 controls the sewage in the liquid storage tank 404 to be recovered to the moon pool sewage tank 307 according to the electrical signal, and the moon pool central operation console 1 is also used to control the clean water in the moon pool sewage tank 307 to be injected into the liquid storage tank 404.

[0036] During specific implementation, the moon pool central operation console 1, the moon pool air control assembly 2 and the moon pool circulation system assembly 3 are all arranged in the moon pool platform area, and the moon pool circulation system assembly 3 includes the aforementioned moon pool sewage tank 307.

[0037] By switching the liquid level signal into an electrical signal, the moon pool central operation console 1 can make corresponding control strategies in a timely manner, that is, control the sewage in the liquid storage tank 404 to be recovered to the moon pool sewage tank 307, which also avoids the problem of marine environment pollution caused by overflow mud; in addition, the moon pool central operation console 1 is also used to control the clean water in the moon pool sewage tank 307 to be injected into the liquid storage tank 404, thereby playing a role in cleaning, cooling and lubricating the expansion joint sealing packing 402.

[0038] Among them, Figure 2-Figure 3 As shown, the float liquid level sensing assembly 406 includes an outer shell 4061 which is arranged in the liquid storage tank 404 and has an opening at the lower end. A floating core 4067 is arranged in the outer shell 4061. A lever-type air valve 4063 is fixed in the outer shell 4061 above the floating core 4067. The floating core 4067 is arranged to float under the action of the mud cooling water mixture 405 in the liquid storage tank 404. The lever-type air valve 4063 is arranged to be in a normally open state, and when the liquid level in the liquid storage tank 404 reaches the set liquid level, the floating core 4067 can act on the lever-type air valve 4063 to switch the lever-type air valve 4063 to a closed state; the moon pool air control assembly 2 is used to obtain an electrical signal after the lever-type air valve 4063 is switched to a closed state.

[0039] Specifically, the float liquid level sensing assembly 406 includes a float core 4067 and a lever-type air valve 4063, wherein the float core 4067 can float up under the buoyancy of the mud cooling water mixture 405 in the liquid storage tank 404. When the liquid level of the mud cooling water mixture 405 in the liquid storage tank 404 reaches a set height, the float core 4067 cannot continue to float up due to the obstruction of the lever-type air valve 4063 fixed in the outer shell 4061. When the liquid level of the mud cooling water mixture 405 in the liquid storage tank 404 continues to rise, the force between the float core 4067 and the lever-type air valve 4063 gradually increases. Finally, when the liquid level of the mud cooling water mixture 405 in the liquid storage tank 404 reaches the set liquid level, the lever-type air valve 4063 switches to a closed state.

[0040] The float liquid level sensing assembly 406 of this embodiment feeds back the liquid level signal through the lever-type air valve 4063, and there is no electrical component on the expansion joint body, thereby improving the reliability of signal transmission in the expansion joint area with complex working conditions, and also avoiding the safety risks brought by electrical components in the area with high explosion-proof requirements. At the same time, the setting of the lever-type air valve 4063 achieves the purpose of liquid level position monitoring, so that the moon pool central operation console 1 can control the overflow mud recovery.

[0041] Among them, Figure 3 As shown, an open bottom support 4068 is provided at the lower end of the outer shell 4061 , and the floating core 4067 is provided on the open bottom support 4068 .

[0042] like Figure 3 As shown, a top panel 4066 is provided at the upper end of the floating core 4067, and the floating core 4067 cooperates with the lever-type air valve 4063 through the top panel 4066. The provision of the top panel 4066 protects the floating core 4067, and avoids the wear of the floating core 4067 caused by the long-term interaction between the floating core 4067 and the lever-type air valve 4063. The outer shell 4061 and the top panel 4066 are both made of stainless steel.

[0043] like Figure 3 As shown, a fixed valve bracket 4062 is fixedly connected inside the outer shell 4061 above the floating core 4067 , and the lever-type air valve 4063 is fixedly connected to the fixed valve bracket 4062 .

[0044] like Figure 3 As shown, a liquid level indicator rod 4064 is provided on the top panel 4066 , and the liquid level indicator rod 4064 is used to indicate the liquid level in the liquid storage tank 404 .

[0045] like Figure 3 As shown, a limit liquid level visual mark 4065 is provided on the liquid level indicator rod 4064. The limit liquid level visual mark 4065 is provided to indicate the limit liquid level in the liquid storage tank 404. When the liquid level in the liquid storage tank 404 reaches the set liquid level, the liquid level is located at the limit liquid level visual mark 4065.

[0046] Among them, Figure 1 , Figure 4 As shown, the moon pool air control assembly 2 includes an air pressure control relay 206, one end of the lever type air valve 4063 is connected to the air valve air inlet path 12, the other end of the lever type air valve 4063 is connected to the air valve air return path 13, the air pressure control relay 206 is arranged on the air valve air return path 13, the air valve air inlet path 12 is connected to the air source, the air pressure control relay 206 can obtain an electrical signal after the lever type air valve 4063 is switched to a closed state, and after the air pressure control relay 206 obtains the electrical signal, the electrical signal is submitted to the moon pool central operation console 1 through the electronic control bus 16.

[0047] Specifically, one end of the lever-type air valve 4063 is connected to the air source through the air valve inlet path 12, and the other end of the lever-type air valve 4063 is connected to the air valve return path 13. The air pressure control relay 206 is arranged on the air valve return path 13. Therefore, after the lever-type air valve 4063 is switched to a closed state, the gas in the air source acts on the air pressure control relay 206 through the air valve inlet path 12 and the air valve return path 13. The air pressure control relay 206 is activated by the high-pressure air in the air source to obtain a corresponding electrical signal. The electrical signal is submitted to the moon pool central operation console 1 through the electronic control bus 16, and the moon pool central operation console 1 makes a corresponding control strategy accordingly.

[0048] Among them, Figure 1 , Figure 4 As shown, the moon pool air control assembly 2 also includes an air intake valve 201, a dryer 202 and a gas processor 203. The air valve air intake path 12 is connected to the air source through the platform air supply pipe 8. The air intake valve 201, the dryer 202 and the gas processor 203 are all arranged on the platform air supply pipe 8.

[0049] Specifically, the dryer 202 is used to dry the gas to prevent the moist gas from causing the metal components on the gas path to rust. The gas processor 203 is used to filter the gas.

[0050] Among them, Figure 1 , Figure 4 As shown, the air valve air inlet circuit 12 is connected to the air inlet end of the two-position two-way electromagnetic reversing valve 205, and the air outlet end of the two-position two-way electromagnetic reversing valve 205 is connected to the control end of the pneumatic sewage pump 302 through the pneumatic pump power air circuit 11, and the two-position two-way electromagnetic reversing valve 205 is set to be in a normally open state. The moon pool central operation console 1 is used to control the two-position two-way electromagnetic reversing valve 205 to switch to a closed state after receiving an electrical signal; a sewage recovery port 407 is provided on the liquid storage tank 404, and an overflow mud return inlet 303 is provided on the moon pool sewage tank 307. The sewage recovery port 407 is connected to the overflow mud return inlet 303 through the sewage recovery liquid circuit 14, and the pneumatic sewage pump 302 is arranged on the sewage recovery liquid circuit 14, and a pressure gauge 301 is provided on the sewage recovery liquid circuit 14.

[0051] As can be seen from the above, the liquid in the liquid storage tank 404 can enter the moon pool sewage tank 307 under the control of the moon pool central operation console 1. This process also requires the participation of the gas in the air source. Specifically: after the moon pool central operation console 1 receives the electrical signal corresponding to the liquid level information when the liquid in the liquid storage tank 404 is at the set liquid level, the moon pool central operation console 1 controls the two-position two-way electromagnetic reversing valve 205 to switch from the normally open state to the closed state. After the two-position two-way electromagnetic reversing valve 205 is switched to the closed state, the pneumatic sewage pump 302 is connected to the air source through the two-position two-way electromagnetic reversing valve 205. Therefore, the gas in the air source can act on the pneumatic sewage pump 302 to turn on the pneumatic sewage pump 302. When the pneumatic sewage pump 302 is turned on, the liquid in the liquid storage tank 404 is pumped into the moon pool sewage tank 307.

[0052] The moon pool central operation console 1 can also set the closing time of the two-position two-way electromagnetic reversing valve 205 after it is switched to the closed state as needed, so as to control the amount of sewage pumped into the moon pool sewage tank 307 by the pneumatic sewage pump 302.

[0053] In this embodiment, the volume of the moon pool sewage tank 307 is larger than the volume of the liquid storage tank 404. In this embodiment, the liquid storage tank 404 is connected to the moon pool sewage tank 307 through the sewage recovery liquid path 14. When a large amount of mud overflows, the moon pool sewage tank 307 has sufficient volume for collecting the overflow mud, thereby greatly improving the sludge collection capacity and further reducing the risk of pollution.

[0054] Among them, Figure 1 , Figure 2 and Figure 4 As shown, a cooling water injection port 408 is provided on the liquid storage tank 404, and a clean water injection port 309 is provided on the moon pool sewage tank 307. The cooling water injection port 408 is connected with the clean water injection port 309 through a clean water injection liquid path 15. A clean water injection air control valve 310 is provided on the clean water injection liquid path 15. The clean water injection air control valve 310 is set to a cut-off state, and the clean water injection air control valve 310 is connected to the valve air inlet path 12 through a two-position four-way electromagnetic reversing valve 204. The two-position four-way electromagnetic reversing valve 204 is controlled by the moon pool central operation console 1; the moon pool sewage tank 307 is arranged above the liquid storage tank 404, so that after the clean water injection air control valve 310 is switched to the conducting state, the liquid in the moon pool sewage tank 307 can flow into the liquid storage tank 404 under the action of gravitational potential energy.

[0055] Specifically, the liquid storage tank 404 and the moon pool sewage tank 307 are connected via the clean water injection liquid path 15, and the clean water injection air control valve 310 on the clean water injection liquid path 15 is set to a cut-off state under normal conditions, so that the liquid in the moon pool sewage tank 307 cannot flow into the liquid storage tank 404. The state of the clean water injection air control valve 310 can be switched from the cut-off state to the conducting state, and the state switching of the clean water injection air control valve 310 is realized by the two-position four-way electromagnetic reversing valve 204, and the two-position four-way electromagnetic reversing valve 204 is controlled by the moon pool central operation console 1. That is, under normal circumstances, the two-position four-way electromagnetic reversing valve 204 is in a state that makes the clean water injection air control valve 310 in a cut-off state. When the two-position four-way electromagnetic reversing valve 204 is controlled to be switched through the moon pool central operation console 1, the clean water injection air control valve 310 is switched to a conducting state. Since the moon pool sewage tank 307 is arranged above the liquid storage tank 404, after the clean water injection air control valve 310 is switched to the conducting state, the liquid in the moon pool sewage tank 307 can flow into the liquid storage tank 404 under the action of gravitational potential energy.

[0056] In this embodiment, the moon pool sewage tank 307 collects the liquid in the liquid storage tank 404 on the one hand, and on the other hand, provides cooling and lubricating water for the expansion joint sealing packing 402 through sedimentation purification. Therefore, under the condition that the moon pool sewage tank 307 is not connected to an external water source, the arrangement of this embodiment can realize the recycling of lubricating and cooling water, thereby ensuring that the expansion joint sealing packing 402 is always in a cooling and lubricating state, avoiding the waste of water resources caused by the constant opening of cooling water, and at the same time avoiding the pollution caused by the cooling water mixed with dirty mud entering the marine environment.

[0057] During specific implementation, the air valve air inlet path 12 , the air valve air return path 13 , the sewage recovery liquid path 14 and the clean water injection liquid path 15 are all arranged in the UU-shaped suspended pipeline area 5 .

[0058] Among them, Figure 4 As shown, the clean water injection air control valve 310 has two control ports, wherein one of the control ports of the clean water injection air control valve 310 is connected to one of the working ports of the two-position four-way solenoid reversing valve 204 through the first control air circuit 9, and the other control port of the clean water injection air control valve 310 is connected to the other working port of the two-position four-way solenoid reversing valve 204 through the second control air circuit 10, and the air inlet of the two-position four-way solenoid reversing valve 204 is connected to the air valve air inlet circuit 12.

[0059] Among them, Figure 4As shown, the clean water injection port 309 is arranged in the middle of the moon pool sewage tank 307; a platform clean water inlet 304 is arranged on the top of the moon pool sewage tank 307, and the platform clean water inlet 304 is connected to the platform water source through a clean water injection pipe 7, and a water valve 305 is arranged on the clean water injection pipe 7; the bottom of the moon pool sewage tank 307 is connected to a sewage pipe 6, and a sewage valve 308 is arranged on the sewage pipe 6.

[0060] Specifically, the moon pool sewage tank 307 has a larger capacity than the liquid storage tank 404, and is placed on the moon pool platform; the moon pool sewage tank 307 performs preliminary pretreatment of the liquid in it through sedimentation purification. The top of the moon pool sewage tank 307 is provided with a platform clean water inlet 304 and an overflow mud return inlet 303, and a sewage outlet is reserved at the bottom of the moon pool sewage tank 307, which is connected to a sewage valve 308, and a clean water injection port 309 is provided in the middle of the moon pool sewage tank 307.

[0061] Among them, the positioning of the clean water injection port 309 and the sewage pipe 6 realizes the reuse of the precipitated and purified liquid in the moon pool sewage tank 307, that is, the precipitated and purified liquid is injected into the liquid storage tank 404 through the clean water injection port 309, so that the precipitated and purified liquid can be used to cool and lubricate the expansion joint sealing packing 402; on the other hand, it is convenient for the mud accumulated at the bottom of the moon pool sewage tank 307 to be discharged through the sewage pipe 6.

[0062] The float liquid level sensing assembly 406 of this embodiment converts the liquid level signal when the liquid level in the liquid storage tank 404 reaches the set liquid level into a signal from disconnection to connection in the air circuit, and then finally converts it into an electrical signal through the air pressure control relay 206 and transmits it to the moon pool central operation console 1.

[0063] When the liquid level in the liquid storage tank 404 is higher than the set liquid level, the moon pool central operation console 1 receives an electrical signal and controls the two-position two-way electromagnetic reversing valve 205 to switch to a closed state. After the two-position two-way electromagnetic reversing valve 205 is switched to a closed state, the gas source gas passes through the two-position two-way electromagnetic reversing valve 205 to open the pneumatic sewage pump 302, and the pneumatic sewage pump 302 draws the liquid in the liquid storage tank 404 back to the moon pool sewage tank 307 installed on the moon pool platform. The opening time of the two-position two-way electromagnetic reversing valve 205 is controlled by the moon pool central operation console 1, and the pneumatic sewage pump 302 runs according to the designed flow rate for the opening time of the two-position two-way electromagnetic reversing valve 205 and then closes.

[0064] A clean water injection gas-controlled valve 310 is provided on the clean water injection liquid circuit 15. The clean water injection gas-controlled valve 310 is controlled by a two-position four-way electromagnetic reversing valve 204. The two-position four-way electromagnetic reversing valve 204 is controlled by the moon pool central operation console 1. Under normal circumstances, the clean water injection gas-controlled valve 310 is in a cut-off state, and the two-position four-way electromagnetic reversing valve 204 is in one of the working positions. When the two-position four-way electromagnetic reversing valve 204 is controlled by the moon pool central operation console 1 to switch to another working position, the clean water injection gas-controlled valve 310 switches to a conducting state. At this time, the upper cooling water after precipitation and purification in the moon pool sewage tank 307 is injected into the liquid storage tank 404 by means of the gravitational potential energy generated by the liquid level height difference. The cooling water injected into the liquid storage tank 404 can clean, cool and lubricate the expansion joint sealing packing 402.

[0065] The arrangement of this embodiment enables the cooling water and overflow mud recovery to form a self-circulating, self-balancing closed system, which can perform the self-purification work of the packing coolant for a long time without human intervention.

[0066] Among them, Figure 5 As shown, a control knob 103 for a two-position, two-way solenoid reversing valve 205 and a control knob 103 for a two-position, four-way solenoid reversing valve 204 are provided on the moon pool central operating console 1; the setting of the control knob 103 here is used to facilitate manual control of the two-position, two-way solenoid reversing valve 205 and the two-position, four-way solenoid reversing valve 204.

[0067] An electronic level meter 306 is provided in the moon pool sewage tank 307, and the electronic level meter 306 is connected to the moon pool central operation console 1. The electronic level meter 306 is used to be triggered after the liquid level in the moon pool sewage tank 307 reaches the set liquid level, so as to send an alarm signal to the moon pool central operation console 1. When the electronic level meter 306 detects that the liquid level value of the electronic level meter 306 exceeds the alarm threshold, the electronic level meter 306 sends an alarm signal to the moon pool central operation console 1, and the moon pool central operation console 1 sends the alarm signal to the platform driller.

[0068] Among them, the operation console 104 on the moon pool central operation console 1 is provided with a status indicator light 101 and a light group test button 102, wherein the status indicator light 101 is used to indicate the current system working status, and the light group test button 102 is used to test whether the status indicator light 101 is working normally.

[0069] Among them, the input information of the moon pool central operation console 1 mainly includes the opening signal of the air pressure control relay 206; the control objects of the moon pool central operation console 1 include the two-position two-way electromagnetic reversing valve 205 and the two-position four-way electromagnetic reversing valve 204; the output information of the moon pool central operation console 1 includes the switching frequency of the two-position four-way electromagnetic reversing valve 204, the real-time capacity of the moon pool sewage tank 307 and the alarm threshold of the electronic liquid level meter 306 determined by calculating relevant parameters.

[0070] The two-position two-way solenoid reversing valve 205 and the two-position four-way solenoid reversing valve 204 of this embodiment are both manual and electric dual-mode control elements, and the platform operator can manually control the relevant controllers when he deems it necessary.

[0071] The liquid storage tank 404 of this embodiment is an accessory designed to realize the temporary storage function of mud. It can be inserted before the telescopic joint inner tube 403 is installed, and can also be designed as a two-half type to achieve low-pressure sealing through a sealing strip; the liquid storage tank 404 is located above the telescopic joint outer tube 401.

[0072] For the aforementioned mud collection and cooling water circulation system, the embodiment of the present invention further provides three control modes: cooling water circulation mode, liquid storage tank alarm mode and manual control mode, which are specifically described as follows:

[0073] 1. Cooling water circulation mode:

[0074] The initial water level of the sewage tank of the moon pool is set to 2 / 3 of the capacity of the tank. A low water level lower than the set liquid level is reserved in the liquid storage tank. Without considering the leakage at the sealing packing of the expansion joint, the total water volume of the two water storage devices is constant. The position change of the two-position four-way solenoid reversing valve is controlled by the central operation console of the moon pool, so that the clean water injection air control valve is switched to the conducting state. The gravitational potential energy generated by the liquid level height difference is used to inject the cooling water in the sewage tank of the moon pool into the liquid storage tank. The position change time interval and the duration of each position change of the two-position four-way solenoid reversing valve are set by the central operation console of the moon pool, and the duration of each position change of the two-position four-way solenoid reversing valve must be sufficient to enable the liquid level in the liquid storage tank to reach the set liquid level. The liquid level in the liquid storage tank rises after each position change of the two-position four-way solenoid reversing valve. When the liquid level in the liquid storage tank reaches When the set liquid level is reached, the lever-type air valve in the float liquid level sensing assembly switches to a closed state, and the high-pressure air provided by the air source pushes open the air pressure control relay. After receiving the electrical signal, the moon pool central operation console controls the two-position two-way solenoid reversing valve to switch to a closed state. After the two-position two-way solenoid reversing valve switches to a closed state, the pneumatic sewage pump starts to pump the liquid in the storage tank to the moon pool sewage tank. The timing of the two-position two-way solenoid reversing valve switching to a closed state is controlled by the liquid level in the storage tank, and the duration of each switch of the two-position two-way solenoid reversing valve to a closed state is set by the moon pool central operation console.

[0075] For the cooling water circulation mode, when there is no mud leakage at the expansion joint sealing packing, the water intake and pumping reach a dynamic balance, and the liquid in the storage tank can be circulated, which plays the role of using the surface clean water after sedimentation and purification in the moon pool sewage tank to replace the mud cooling water mixture in the storage tank and using the surface clean water after sedimentation and purification in the moon pool sewage tank to cool the expansion joint sealing packing.

[0076] When mud leakage occurs at the sealing packing of the expansion joint, the total water volume of the two water storage devices increases, and the liquid level in the storage tank is kept floating within a certain range through the linkage of the float liquid level sensing assembly and the pneumatic sewage pump. As the liquid in the storage tank is pumped in, the liquid level in the moon pool sewage tank gradually rises to the alarm threshold of the electronic level gauge, and the electronic level gauge sends an alarm signal to the moon pool central operation console, which sends the alarm signal to the platform driller.

[0077] 2. Liquid storage tank alarm mode:

[0078] The two-position four-way electromagnetic reversing valve is controlled to switch to the normal working position through the central operation console of the moon pool, so that the clean water injection air control valve is in the cut-off state, and the role of sewage replacement and cooling achieved by injecting water through the sewage tank of the moon pool is not considered. At this time, the rise of the liquid level in the reservoir can only come from the leakage of the expansion joint sealing packing. When the liquid level of the mud cooling water mixture rises to the set liquid level, the lever-type air valve in the float liquid level sensing assembly switches to the closed state, and the high-pressure air provided by the air source causes the air pressure control relay to receive an electrical signal. In this mode, the signal received by the air pressure control relay is directly used as the driller alarm signal. At the same time, after receiving the electrical signal, the central operation console of the moon pool controls the two-position two-way electromagnetic reversing valve to switch to the closed state. After the two-position two-way electromagnetic reversing valve switches to the closed state, the pneumatic sewage pump starts to pump the liquid in the reservoir to the sewage tank of the moon pool to prevent the liquid level from further rising and causing sewage overflow.

[0079] 3. Manual control mode:

[0080] A control knob (103) is provided on the central operating console of the moon pool. When the platform operator deems it necessary, the control knob (103) can be manually controlled to switch between the two-position four-way electromagnetic reversing valve and the two-position two-way electromagnetic reversing valve, so as to perform water inlet and water outlet operations for the liquid storage tank.

[0081] The embodiment of the present invention designs a set of monitoring logic and control system for mud leakage status at the expansion joint sealing packing position. When the electronic liquid level gauge sends an alarm signal to the moon pool central operation console in the cooling water circulation mode, or when the air pressure control relay receives an electrical signal in the alarm mode, it means that long-term and large-flow mud leakage has occurred at the mud sealing packing position. The system is provided with an in-situ sound and light alarm and an alarm function transmitted to the driller's workroom.

[0082] The setting of the three modes in this embodiment allows the operator to select a working mode that is more suitable for the working needs of the platform according to demand.

[0083] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by those skilled in the art to which the present invention belongs.

[0084] In addition, the terms "one", "two", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present invention, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0085] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0086] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A mud collection and cooling water circulation system, characterized in that: It includes a liquid storage tank arranged on the telescopic joint for collecting mud and storing cooling water, a float liquid level sensing assembly is arranged in the liquid storage tank, the float liquid level sensing assembly is connected to the moon pool air control assembly in the moon pool platform area, the float liquid level sensing assembly is used to switch when the liquid level in the liquid storage tank reaches the set liquid level so that the moon pool air control assembly obtains an electrical signal, the moon pool air control assembly is used to submit the electrical signal to the moon pool central operation console in the moon pool platform area; the moon pool central operation console is used to control the sewage in the liquid storage tank to be recovered to the moon pool sewage tank in the moon pool platform area according to the electrical signal, and the moon pool central operation console is also used to control the clean water in the moon pool sewage tank to be injected into the liquid storage tank.

2. The mud collection and cooling water circulation system according to claim 1, characterized in that: The float liquid level sensing assembly includes an outer shell body which is arranged in the liquid storage tank and has an opening at the lower end, a float core is arranged in the outer shell body, a lever-type air valve is fixed in the outer shell body above the float core, the float core is arranged to float under the action of the liquid in the liquid storage tank, the lever-type air valve is arranged to be in a normally open state, and when the liquid level in the liquid storage tank reaches a set liquid level, the float core can act on the lever-type air valve to switch the lever-type air valve to a closed state; the moon pool air control assembly is used to obtain the electrical signal after the lever-type air valve is switched to a closed state.

3. The mud collection and cooling water circulation system according to claim 2, characterized in that: An open bottom support is provided at the lower end of the outer shell, and the floating core is provided on the open bottom support; a top panel is provided at the upper end of the floating core, and the floating core cooperates with the lever-type air valve through the top panel; a fixed valve bracket is fixedly connected to the outer shell above the floating core, and the lever-type air valve is fixedly connected to the fixed valve bracket; a liquid level indicator rod is provided on the top panel, and the liquid level indicator rod is used to indicate the liquid level of the liquid in the liquid storage tank; a limit liquid level visual mark is provided on the liquid level indicator rod, and when the liquid level in the liquid storage tank reaches the set liquid level, the liquid level is located at the limit liquid level visual mark.

4. The mud collection and cooling water circulation system according to claim 2, characterized in that: The moon pool air control assembly includes an air pressure control relay, one end of the lever type air valve is connected to the air valve air inlet path, the other end of the lever type air valve is connected to the air valve air return path, the air pressure control relay is arranged on the air valve air return path, the air valve air inlet path is connected to the air source, the air pressure control relay can obtain the electrical signal after the lever type air valve is switched to a closed state, and after the air pressure control relay obtains the electrical signal, the electrical signal is submitted to the moon pool central operation console through the electronic control bus.

5. The mud collection and cooling water circulation system according to claim 4, characterized in that: The moon pool gas control assembly also includes an air intake valve, a dryer and a gas processor. The air intake path of the air valve is connected to the air source through a platform air supply pipe. The air intake valve, the dryer and the gas processor are all arranged on the platform air supply pipe.

6. The mud collection and cooling water circulation system according to claim 4, characterized in that: The air valve inlet circuit is connected to the air inlet end of the two-position two-way electromagnetic reversing valve, and the air outlet end of the two-position two-way electromagnetic reversing valve is connected to the control end of the pneumatic sewage pump through the pneumatic pump power air circuit. The two-position two-way electromagnetic reversing valve is set to be in a normally open state, and the moon pool central operation console is used to control the two-position two-way electromagnetic reversing valve to switch to a closed state after receiving the electrical signal; the moon pool central operation console is also used to control the closing time of the two-position two-way electromagnetic reversing valve to switch to the closed state; a sewage recovery port is provided on the liquid storage tank, and an overflow mud return inlet is provided on the moon pool sewage tank. The sewage recovery port is connected to the overflow mud return inlet through a sewage recovery liquid circuit, and the pneumatic sewage pump is arranged on the sewage recovery liquid circuit.

7. The mud collection and cooling water circulation system according to claim 6, characterized in that: A cooling water inlet is provided on the liquid storage tank, and a clean water inlet is provided on the moon pool sewage tank. The cooling water inlet is connected to the clean water inlet through a clean water injection liquid path. A clean water injection air control valve is provided on the clean water injection liquid path. The clean water injection air control valve is set to a cut-off state, and the clean water injection air control valve is connected to the valve air inlet path through a two-position four-way electromagnetic reversing valve. The two-position four-way electromagnetic reversing valve is controlled by the moon pool central operation console; the moon pool sewage tank is arranged above the liquid storage tank, so that after the clean water injection air control valve is switched to the on state, the liquid in the moon pool sewage tank can flow into the liquid storage tank under the action of gravitational potential energy.

8. The mud collection and cooling water circulation system according to claim 7, characterized in that: The clean water injection air-controlled valve has two control ports, one of which is connected to one of the working ports of the two-position four-way solenoid reversing valve through a first control air circuit, and the other control port of the clean water injection air-controlled valve is connected to the other working port of the two-position four-way solenoid reversing valve through a second control air circuit, and the air inlet of the two-position four-way solenoid reversing valve is connected to the air inlet circuit of the air valve.

9. The sludge collection and cooling water circulation system according to claim 7, characterized in that: The clean water injection port is arranged in the middle of the moon pool sewage tank, the moon pool sewage tank is connected with a clean water injection pipe and a sewage pipe, the sewage pipe is arranged at the bottom of the moon pool sewage tank, the clean water injection pipe is provided with a water valve, and the sewage pipe is provided with a sewage valve; a pressure gauge is provided on the sewage recovery liquid circuit.

10. The mud collection and cooling water circulation system according to claim 7, characterized in that: The moon pool central operation console is provided with a control knob for a two-position two-way electromagnetic reversing valve and a control knob for a two-position four-way electromagnetic reversing valve; an electronic liquid level meter is provided in the moon pool sewage tank, and the electronic liquid level meter is connected to the moon pool central operation console, and the electronic liquid level meter is used to be triggered when the liquid level in the moon pool sewage tank reaches the set liquid level, so as to send an alarm signal to the moon pool central operation console.

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