Three-phase separation system for drilling fluid
By designing a three-phase separation system for drilling fluid, including cyclones, flocculant agents and filter plates, the problem of excessive water content in the solid phase is solved, and high-precision three-phase separation and environmental protection are achieved.
Patent Information
- Application Number
- CN202421831592.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-31
- Publication Date
- 2025-06-10
- Estimated Expiration
- 2034-07-31
AI Technical Summary
In the three-phase separation process of drilling fluid, the solid phase water content is too high, and high-precision separation cannot be achieved, resulting in environmental pollution problems.
A three-phase separation system for drilling fluid is designed, including a sludge separation tank, a sludge-water coagulation tank and a solid-liquid separation tank. The oil phase and the mud-water phase were separated by a cyclone, and flocculation agent was added for coagulation. The filter plate and solid phase tube were used to further reduce the water content of the solid phase.
It effectively reduces the water content of the solid phase, improves the accuracy of three-phase separation, reduces environmental pollution, and achieves efficient treatment of drilling fluid.
Smart Images
Figure CN222961283U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of drilling fluid treatment, in particular to a three-phase separation system for drilling fluid. Background Art
[0002] During the drilling process, the drilling fluid is used to circulate and flush the borehole and the drill string. During the drilling process, with the continuous deterioration of the drilling mud circulation, a large amount of waste drilling fluid will be generated. The waste drilling fluid contains a multi-phase steady-state colloid suspension system of clay, weighting materials, sewage, dirty oil, drill cuttings, and heavy metals, which is very harmful to the environment. If it is not treated and discharged arbitrarily, it will cause serious pollution to the surrounding soil, vegetation, surface water, and groundwater.
[0003] At present, a hydrocyclone is used to realize the three-phase separation of waste drilling fluid, but the water content of the separated solid phase is too high to achieve high-precision separation. Summary of the Utility Model
[0004] The purpose of the utility model is to provide a three-phase separation system for drilling fluid, and the technical problem to be solved is to reduce the water content of the solid phase.
[0005] The utility model is realized by the following technical solutions:
[0006] A three-phase separation system for drilling fluid includes an oil-sludge separation tank, a mud-water coagulation tank, and a solid-liquid separation tank;
[0007] The above-mentioned oil-sludge separation tank includes a first tank body. A first partition board and a hydrocyclone are arranged in the first tank body. The first partition board is used to separate the chamber of the first tank body to form an oil chamber and a mud-water chamber. The hydrocyclone includes a raw liquid inlet, a bottom flow port for discharging the mud-water phase, and an overflow port for discharging the oil phase. The bottom flow port of the hydrocyclone extends into the mud-water chamber, and the overflow port of the hydrocyclone extends into the oil chamber. An oil-phase discharge port is arranged on the oil chamber, and this oil-phase discharge port is used to discharge the oil phase;
[0008] The above-mentioned mud-water coagulation tank includes a second tank body. The second tank body is communicated with the mud-water chamber through a mud pipe. A reagent addition port is arranged on the second tank body, and this reagent addition port is used to add flocculation reagents;
[0009] The above-mentioned solid-liquid separation tank includes a third tank body. A filter plate is arranged in the third tank body. The filter plate is used to separate the chamber of the third tank body to form a turbid liquid chamber and a solid chamber. The solid chamber is located below the turbid liquid chamber. A turbid liquid discharge port is arranged on the turbid liquid chamber, and this turbid liquid discharge port is used to discharge the turbid liquid phase;
[0010] The above-mentioned solid chamber is communicated with the second tank body through a coagulated liquid pipe. A solid-phase discharge port is arranged at the bottom of the solid chamber, and a solid-phase pipe is connected to the solid-phase discharge port;
[0011] The above-mentioned solid-phase pipe includes an outer straight pipe and an inner bent pipe, and the inner bent pipe is sleeved inside the outer straight pipe; the inner bent pipe is provided with filter holes for the turbid liquid to pass through; the inner bent pipe is used to discharge the solid phase;
[0012] A water storage tank is provided at the end of the outer straight pipe, and the water storage tank is provided with a return port, and the return port is communicated with the mud-water coagulation tank through a return pipe.
[0013] The hydrocyclone in the above-mentioned oil sludge separation tank separates the oil phase and the mud-water phase in the drilling fluid through rotation. Due to the lower density, the oil phase enters the oil cavity through the overflow port of the hydrocyclone, while the mud-water phase with a higher density enters the mud-water cavity through the underflow port, removing the oil content; the mud-water coagulation tank adds flocculating agents through the chemical agent addition port and mixes with the mud and water in the mud-water cavity. The flocculating agents prompt the suspended particles and colloids in the mud and water to quickly aggregate into larger particles, facilitating subsequent solid-liquid separation; reducing the dispersion degree of the solid phase in the mud and water and reducing the water content between the solid phase particles; the filter plate in the solid-liquid separation tank separates the turbid liquid cavity and the solid cavity. The chambers in the solid-liquid separation tank are always full. When the coagulated liquid in the solid cavity passes through the filter plate, large-particle solid particles are intercepted in the solid cavity, while the turbid liquid containing small-particle solid particles is discharged from the turbid liquid discharge port, removing the large-particle solid particles in the coagulated liquid; the solid-phase pipe adopts a special design of an outer straight pipe and an inner bent pipe. The inner bent pipe is provided with filter holes. During the falling process of the solid phase, the turbid liquid carried by the solid phase passes through the filter holes and is collected in the water storage tank of the outer straight pipe, enters the circulation through the return pipe, and the solid phase is discharged through the inner bent pipe, further reducing the water content of the solid phase.
[0014] Further, a flow valve is provided on the return pipe.
[0015] The turbid liquid enters the mud-water coagulation tank through the return pipe, further aggregating and settling the small-particle solid particles, thereby reducing the water content of the solid phase. The adjustment of the flow valve enables the system to maintain balance dynamically, adjusts the return flow according to the actual conditions of the mud-water coagulation tank and the water storage tank, and ensures the quality and efficiency of the solid-phase discharge.
[0016] Further, the inner bent pipe is composed of several bent pipe units;
[0017] The bent pipe unit includes a first straight pipe, a second straight pipe, a third straight pipe, a first connecting pipe and a second connecting pipe. The first straight pipe and the second straight pipe are connected through the first connecting pipe, and the included angle between the first straight pipe and the second straight pipe is greater than 90 degrees;
[0018] The second straight pipe and the third straight pipe are connected through the second connecting pipe, and the included angle between the second straight pipe and the third straight pipe is greater than 90 degrees;
[0019] The above-mentioned first straight pipe extends upward from the second straight pipe; the above-mentioned third straight pipe extends downward from the second straight pipe.
[0020] The included angles between the above-mentioned first straight pipe and the second straight pipe, and between the second straight pipe and the third straight pipe are both greater than 90 degrees, which helps to slow down the speed of the solid phase during the flow process, increase its contact time with the inner layer of the bent pipe wall, and thus is beneficial to the further removal of moisture on the surface of the solid phase particles; the first straight pipe extends upward from the second straight pipe, while the third straight pipe extends downward from the second straight pipe, so that after the solid phase enters from the first straight pipe, it successively passes through the first connecting pipe, the second straight pipe, the second connecting pipe and the third straight pipe in a falling trend, filters out part of the turbid liquid through the filter holes, and gradually reduces the water content of the solid phase; the design of the multi-section bent pipe unit and the large-angle connection extends the dehydration path of the solid phase in the inner layer of the bent pipe, increases the contact time and opportunity between the solid phase and the pipe wall, and is beneficial to the removal of moisture on the surface of the solid phase.
[0021] Further, filter holes are provided on the convex surface of the above-mentioned first connecting pipe.
[0022] Further, filter holes are provided on the concave surface of the above-mentioned second connecting pipe.
[0023] Since the convex surface of the above-mentioned first connecting pipe is more easily affected by fluid impact and eddy currents, setting filter holes here can more effectively capture and discharge the turbid liquid attached to the surface of the solid phase. These turbid liquids are thrown to the convex surface under the action of the eddy current and flow out through the filter holes, thus realizing the further dehydration of the solid phase; although the concave surface of the second connecting pipe is less affected by fluid impact compared to the convex surface, when the solid phase turns through the second connecting pipe, the concave surface may become a concentrated area where the solid phase particles contact the pipe wall. Setting filter holes here can ensure that when the solid phase contacts the pipe wall, the turbid liquid attached to its surface can be smoothly discharged; the filter holes on the first connecting pipe and the second connecting pipe work together to form a dual dehydration mechanism. When the solid phase passes through the inner layer of the bent pipe, it is first subjected to the dehydration effect of the filter holes on the convex surface of the first connecting pipe, and then is subjected to the dehydration effect of the filter holes on the concave surface of the second connecting pipe during the turning process. The continuous dehydration process can more thoroughly remove the moisture on the surface of the solid phase.
[0024] Further, the above-mentioned filter plate includes at least two, and a fiber medium is provided between the two filter plates.
[0025] Adopting a multi-layer filter plate structure, the coagulated liquid moves from the solid cavity to the turbid liquid cavity. The filter plate close to the solid cavity is used to intercept large-particle-size solid particles, the fiber medium is used to intercept medium-particle-size solid particles, and the filter plate close to the turbid liquid cavity is used to allow the filtered turbid liquid to pass through quickly and enter the turbid liquid cavity; the quality of solid-liquid separation is improved by means of hierarchical filtration.
[0026] Further, the above-mentioned mud-water coagulation tank further includes a stirring assembly;
[0027] The above-mentioned stirring assembly includes stirring blades, a stirring shaft, and a driving motor. The stirring shaft is connected to the rotating shaft of the driving motor, and the driving motor is used to drive the stirring shaft to rotate;
[0028] The above-mentioned stirring blades are arranged on the stirring shaft, and when the stirring shaft rotates, it drives the stirring blades to rotate.
[0029] When the above-mentioned driving motor starts, its rotating shaft drives the stirring shaft to rotate. As the stirring shaft rotates, the stirring blades installed on the stirring shaft will also rotate accordingly. The rotation of the stirring blades will generate strong shear force and eddy current, making the solid particles and liquid in the muddy water fully mixed. The evenly mixed muddy water mixture and flocculant are more conducive to the occurrence of the coagulation reaction, thereby improving the coagulation effect and product quality.
[0030] Furthermore, the system also includes a turbid liquid purification tank;
[0031] The above-mentioned turbid liquid purification tank includes a fourth tank body. A purification component is arranged in the fourth tank body, and this purification component is used to filter particulate matter and separate the chamber of the fourth tank body to form a liquid inlet chamber and a liquid outlet chamber;
[0032] The above-mentioned liquid inlet chamber is communicated with the turbid liquid chamber through a turbid liquid pipe;
[0033] The above-mentioned liquid outlet chamber is provided with a liquid outlet, and this liquid outlet is used to discharge the purified liquid.
[0034] The turbid liquid flows from the turbid liquid chamber into the liquid inlet chamber of the turbid liquid purification tank through the turbid liquid pipe. In the liquid inlet chamber, the turbid liquid passes through the filtering action of the purification component, and the particulate matter therein is intercepted on the filtering medium, while the purified liquid passes through the filtering medium and enters the liquid outlet chamber. The purified liquid accumulates in the liquid outlet chamber and is discharged from the system through the liquid outlet. By filtering out the particulate matter in the turbid liquid through the purification component, the pollutant content in the emissions is reduced, which helps to protect the environment.
[0035] Furthermore, the above-mentioned purification component includes a first sand core layer, a multi-media mixing layer, and a second sand core layer arranged in sequence.
[0036] Compared with the prior art, the present utility model has the following advantages and beneficial effects:
[0037] The hydrocyclone in the above sludge separation tank separates the oil phase and the muddy water phase in the drilling fluid through rotation. Due to the relatively small density, the oil phase enters the oil chamber through the overflow port of the hydrocyclone, while the muddy water phase with a larger density enters the muddy water chamber through the underflow port, removing the oil content. The muddy water coagulation tank adds flocculating agents through the reagent addition port and mixes with the muddy water in the muddy water chamber. The flocculating agents prompt the suspended particles and colloids in the muddy water to quickly aggregate into larger particles, facilitating subsequent solid-liquid separation; reducing the dispersion degree of the solid phase in the muddy water and decreasing the water content between solid phase particles. The filter plate in the solid-liquid separation tank separates the turbid liquid chamber and the solid chamber. The chambers in this solid-liquid separation tank are always full. When the coagulated liquid in the solid chamber passes through the filter plate, large-particle-size solid particles are intercepted in the solid chamber, while the turbid liquid containing small-particle-size solid particles is discharged from the turbid liquid discharge port, removing the large-particle-size solid particles in the coagulated liquid. The solid phase pipe adopts a special design of an outer straight pipe and an inner bent pipe. There are filter holes at the bending part of the inner bent pipe. During the falling process of the solid phase, the turbid liquid carried by the solid phase passes through the filter holes and is collected in the water storage tank of the outer straight pipe, and then enters the circulation through the return pipe. The solid phase is discharged through the inner bent pipe, further reducing the water content of the solid phase. Brief Description of the Drawings
[0038] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings. In the drawings:
[0039] Figure 1 is a schematic diagram of the overall structure;
[0040] Figure 2 is Figure 1 a partial enlarged view of A in
[0041] Figure 3 is a schematic diagram of the structure of the bent pipe unit.
[0042] Reference numerals in the drawings and the corresponding names of components:
[0043] 10. First tank body; 11. Oil chamber; 12. Mud and water chamber; 13. Hydrocyclone; 14. Stock solution inlet; 15. Underflow port; 16. Overflow port; 17. First partition plate; 18. Oil phase discharge port; 20. Second tank body; 21. Reagent addition port; 22. Driving motor; 23. Stirring paddle; 24. Stirring shaft; 30. Third tank body; 31. Filter plate; 32. Fiber medium; 33. Turbid liquid chamber; 34. Solid chamber; 35. Turbid liquid discharge port; 36. Solid phase discharge port; 371. Outer straight pipe; 372. Inner bent pipe; 373. Filter hole; 374. Water storage tank; 375. Return port; 376. First straight pipe; 377. First connecting pipe; 378. Second straight pipe; 379. Second connecting pipe; 380. Third straight pipe; 38. Flow valve; 40. Fourth tank body; 41. Liquid inlet chamber; 42. Liquid outlet chamber; 43. Liquid inlet; 44. Liquid outlet; 45. First sand core layer; 46. Second sand core layer; 47. Multi-media mixing layer; 48. Purification component; 51. Mud and water pipe; 52. Coagulated liquid pipe; 53. Return pipe; 54. Turbid liquid pipe. Detailed implementation mode
[0044] In order to make the purpose, technical solution and advantages of the present utility model clearer and more understandable, the present utility model will be further described in detail below in combination with embodiments and drawings. The illustrative implementation modes and descriptions of the present utility model are only used to explain the present utility model and shall not be used as a limitation to the present utility model.
[0045] Embodiment 1
[0046] Combined with Figure 1 and Figure 2 , Embodiment 1 of the present invention provides a three-phase separation system for drilling fluid, including an oil and mud separation tank, a mud and water coagulation tank and a solid and liquid separation tank;
[0047] The above-mentioned oil and mud separation tank includes a first tank body 10. A first partition plate 17 and a hydrocyclone 13 are arranged in the first tank body 10. The first partition plate 17 is used to separate the chamber of the first tank body 10 to form an oil chamber 11 and a mud and water chamber 12; The hydrocyclone 13 includes a stock solution inlet 14, an underflow port 15 for discharging the mud and water phase, and an overflow port 16 for discharging the oil phase. The underflow port 15 of the hydrocyclone 13 extends into the mud and water chamber 12, and the overflow port 16 of the hydrocyclone 13 extends into the oil chamber 11; An oil phase discharge port 18 is arranged on the oil chamber 11, and the oil phase discharge port 18 is used to discharge the oil phase;
[0048] The above-mentioned mud and water coagulation tank includes a second tank body 20. The second tank body 20 is communicated with the mud and water chamber 12 through a mud and water pipe 51; A reagent addition port 21 is arranged on the second tank body 20, and the reagent addition port 21 is used to add flocculation reagents;
[0049] The above-mentioned solid-liquid separation tank includes a third tank body 30. A filter plate 31 is arranged inside the third tank body 30. The filter plate 31 is used to separate the chamber of the third tank body 30 to form a turbid liquid chamber 33 and a solid chamber 34. The solid chamber 34 is located below the turbid liquid chamber 33. A turbid liquid discharge port 35 is arranged on the turbid liquid chamber 33, and the turbid liquid discharge port 35 is used to discharge the turbid liquid phase.
[0050] The solid chamber 34 is communicated with the second tank body 20 through a coagulating liquid pipe 52. A solid phase discharge port 36 is arranged at the bottom of the solid chamber 34, and the solid phase discharge port 36 is connected with a solid phase pipe.
[0051] The solid phase pipe includes an outer straight pipe 371 and an inner bent pipe 372. The inner bent pipe 372 is sleeved inside the outer straight pipe. The inner bent pipe 372 is provided with filter holes 373, and the filter holes 373 are used for the turbid liquid to pass through. The end of the inner bent pipe 372 extends out of the outer straight pipe 371, and the inner bent pipe 372 is used to discharge the solid phase.
[0052] A water storage tank 374 is arranged at the end of the outer straight pipe 371. The water storage tank 374 is provided with a reflux port 375, and the reflux port 375 is communicated with the mud-water coagulation tank through a reflux pipe 53.
[0053] The hydrocyclone 13 in the above-mentioned oil sludge separation tank separates the oil phase and the mud-water phase in the drilling fluid through rotation. Since the oil phase has a smaller density, it enters the oil chamber 11 through the overflow port 16 of the hydrocyclone 13, while the mud-water phase with a larger density enters the mud-water chamber 12 through the underflow port 15, removing the oil content. The mud-water coagulation tank adds a flocculating agent through the chemical agent addition port 21 and mixes it with the mud-water in the mud-water chamber 12. The flocculating agent promotes the suspension particles and colloids in the mud-water to quickly aggregate into larger particles, facilitating subsequent solid-liquid separation; reducing the dispersion degree of the solid phase in the mud-water and reducing the water content between the solid phase particles; the filter plate 31 in the solid-liquid separation tank separates the turbid liquid chamber 33 and the solid chamber 34, and the chambers in the solid-liquid separation tank are always full. When the coagulating liquid in the solid chamber 34 passes through the filter plate 31, large-particle-size solid particles are intercepted in the solid chamber 34, while the turbid liquid containing small-particle-size solid particles is discharged from the turbid liquid discharge port 35, removing the large-particle-size solid particles in the coagulating liquid; the solid phase pipe adopts a special design of an outer straight pipe 371 and an inner bent pipe 372. The inner bent pipe 372 is provided with filter holes 373. During the falling process of the solid phase, the turbid liquid carried by the solid phase passes through the filter holes 373 and is collected in the water storage tank 374 of the outer straight pipe 371 and enters the circulation through the reflux pipe 53, while the solid phase is discharged through the inner bent pipe 372, further reducing the water content of the solid phase.
[0054] In a specific embodiment, a flow valve 38 is arranged on the reflux pipe 53.
[0055] The turbid liquid enters the mud - water coagulation tank through the reflux pipe 53, further aggregating and settling small - particle - size solid particles, thereby reducing the water content of the solid phase. The adjustment of the flow valve 38 enables the system to maintain balance dynamically, adjusting the reflux amount according to the actual conditions of the mud - water coagulation tank and the water storage tank 374 to ensure the quality and efficiency of the solid - phase discharge.
[0056] Embodiment 2
[0057] Based on Embodiment 1, combined with Figure 3 , the above - mentioned inner - layer elbow 372 is composed of several elbow units;
[0058] The above - mentioned elbow unit includes a first straight pipe 376, a second straight pipe 378, a third straight pipe 380, a first connecting pipe 377, and a second connecting pipe 379. The first straight pipe 376 and the second straight pipe 378 are connected through the first connecting pipe 377, and the included angle between the first straight pipe 376 and the second straight pipe 378 is greater than 90 degrees;
[0059] The second straight pipe 378 and the third straight pipe 380 are connected through the second connecting pipe 379, and the included angle between the second straight pipe 378 and the third straight pipe 380 is greater than 90 degrees;
[0060] The first straight pipe 376 extends above the second straight pipe 378; the third straight pipe 380 extends below the second straight pipe 378.
[0061] The included angles between the first straight pipe 376 and the second straight pipe 378, and between the second straight pipe 378 and the third straight pipe 380 are both greater than 90 degrees, which helps to slow down the speed of the solid phase during the flow process, increases its contact time with the wall of the inner - layer elbow 372, and thus is conducive to the further removal of moisture on the surface of the solid - phase particles; the first straight pipe 376 extends above the second straight pipe 378, while the third straight pipe 380 extends below the second straight pipe 378, so that after the solid phase enters from the first straight pipe 376, it successively passes through the first connecting pipe 377, the second straight pipe 378, the second connecting pipe 379, and the third straight pipe 380 in a falling trend, filtering out part of the turbid liquid through the filter holes 373 and gradually reducing the water content of the solid phase; the design of multiple - section elbow units and large - angle connections extends the dehydration path of the solid phase in the inner - layer elbow 372, increases the contact time and opportunity between the solid phase and the pipe wall, and is conducive to the removal of moisture on the surface of the solid phase.
[0062] In a specific embodiment, filter holes 373 are provided on the convex outer surface of the first connecting pipe 377.
[0063] In a specific embodiment, filter holes 373 are provided on the concave inner surface of the second connecting pipe 379.
[0064] Since the convex surface of the first connecting pipe 377 is more vulnerable to fluid impact and eddy currents, setting the filter holes 373 here can more effectively capture and discharge the turbid liquid attached to the solid phase surface. This turbid liquid is thrown towards the convex surface under the action of the eddy current and flows out through the filter holes 373, thereby achieving further dehydration of the solid phase. Although the concave surface of the second connecting pipe 379 is less affected by fluid impact compared to the convex surface, when the solid phase turns through the second connecting pipe 379, the concave surface may become a concentrated area where the solid phase particles contact the pipe wall. Setting the filter holes 373 here can ensure that when the solid phase contacts the pipe wall, the turbid liquid attached to its surface can be smoothly discharged. The filter holes 373 on the first connecting pipe 377 and the second connecting pipe 379 work together to form a dual dehydration mechanism. When the solid phase passes through the inner layer elbow 372, it is first dehydrated by the filter holes 373 on the convex surface of the first connecting pipe 377, and then dehydrated by the filter holes 373 on the concave surface of the second connecting pipe 379 during the turning process. The continuous dehydration process can more thoroughly remove the moisture on the solid phase surface.
[0065] Embodiment 3
[0066] Based on any of the above embodiments, the above filter plate 31 includes at least two, and a fiber medium 32 is arranged between the two filter plates 31; the fiber medium 32 has a large specific surface area and porosity, and can adsorb and intercept more solid particles and suspended matters. Setting it between the two filter plates 31 can further enhance the interception ability of the filtration system.
[0067] Adopting a multi-layer filter plate 31 structure, the coagulated liquid moves from the solid chamber 34 to the turbid liquid chamber 33. The filter plate 31 close to the solid chamber 34 is used to intercept large-particle-size solid particles, the fiber medium 32 is used to intercept medium-particle-size solid particles, and the filter plate 31 close to the turbid liquid chamber 33 is used to enable the filtered turbid liquid to quickly pass through and enter the turbid liquid chamber 33; the quality of solid-liquid separation is improved by means of hierarchical filtration.
[0068] Embodiment 4
[0069] Based on any of the above embodiments, to improve the coagulation effect, the above mud-water coagulation tank further includes a stirring assembly, combined with Figure 1 ;
[0070] The above stirring assembly includes a stirring paddle 23, a stirring shaft 24 and a driving motor 22 (a stepping motor can be used). The above stirring shaft 24 is connected to the rotating shaft of the driving motor 22, and the above driving motor 22 is used to drive the stirring shaft 24 to rotate;
[0071] The above stirring paddle 23 is arranged on the stirring shaft 24, and when the stirring shaft 24 rotates, it drives the stirring paddle 23 to rotate.
[0072] When the above-mentioned drive motor 22 is started, its rotating shaft drives the stirring shaft 24 to rotate. As the stirring shaft 24 rotates, the stirring blades 23 installed on the stirring shaft 24 will also rotate accordingly. The rotation of the stirring blades 23 will generate strong shear force and eddy current, enabling the solid particles and liquid in the muddy water to be fully mixed. The evenly mixed muddy water mixture and flocculating agent are more conducive to the occurrence of the coagulation reaction, thereby improving the coagulation effect and product quality.
[0073] Example 5
[0074] On the basis of any of the above embodiments, in order to further reduce the content of particulate matter in the turbid liquid and improve the separation accuracy of solid and liquid; the system further includes a turbid liquid purification tank, combined with Figure 1 ;
[0075] The above-mentioned turbid liquid purification tank includes a fourth tank body 40, and a purification component 48 is arranged in the fourth tank body 40. The purification component 48 is used for filtering particulate matter and separating the chamber of the fourth tank body 40 to form a liquid inlet chamber 41 and a liquid outlet chamber 42;
[0076] A liquid inlet 43 is arranged on the above-mentioned liquid inlet chamber 41, and the liquid inlet 43 is communicated with the turbid liquid chamber 33 through a turbid liquid pipe 54;
[0077] A liquid outlet 44 is arranged on the above-mentioned liquid outlet chamber 42, and the liquid outlet 44 is used for discharging the purified liquid.
[0078] The turbid liquid flows from the turbid liquid chamber 33 into the liquid inlet chamber 41 of the turbid liquid purification tank through the turbid liquid pipe 54. In the liquid inlet chamber 41, the turbid liquid passes through the filtering action of the purification component 48, and the particulate matter therein is intercepted on the filtering medium, while the purified liquid passes through the filtering medium and enters the liquid outlet chamber 42. The purified liquid accumulates in the liquid outlet chamber 42 and is discharged from the system through the liquid outlet 44. By filtering out the particulate matter in the turbid liquid through the purification component 48, the pollutant content in the emissions is reduced, which helps to protect the environment.
[0079] In a specific embodiment, the above-mentioned purification component 48 includes a first sand core layer 45, a multi-media mixing layer 47, and a second sand core layer 46 arranged in sequence.
[0080] The above-mentioned first sand core layer 45 is mainly composed of fine sand, which preliminarily intercepts and removes large particle impurities in the turbid liquid; the multi-media mixing layer 47 is located behind the first sand core layer 45. The multi-media mixing layer 47 is usually composed of a mixture of various filtering media with different particle sizes and different materials, such as quartz sand, activated carbon, anthracite, etc.; the mixed use of various media can form a more complex filtering structure, effectively removing pollutants such as fine particles, organic matter, and heavy metal ions in the turbid liquid, and further improving the purification effect; the second sand core layer 46 uses fine sand again to further remove possible remaining fine particles and impurities, ensuring the clarity and quality of the purified liquid.
[0081] The specific embodiments described above further elaborate on the purpose, technical solution, and beneficial effects of the present utility model. It should be understood that the above description is only for the specific embodiments of the present utility model and is not used to limit the protection scope of the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.
Claims
1. A three-phase separation system for drilling fluid, characterized in that: Including oil-sludge separation tank, mud-water coagulation tank and solid-liquid separation tank; The oil-sludge separation tank comprises a first tank body (10), wherein a first partition plate (17) and a cyclone (13) are arranged in the first tank body (10), wherein the first partition plate (17) is used to separate the chamber of the first tank body (10) to form an oil chamber (11) and a mud-water chamber (12); the cyclone (13) comprises a raw liquid inlet (14), a bottom flow port (15) for discharging a mud-water phase, and an overflow port (16) for discharging an oil phase, wherein the bottom flow port (15) of the cyclone (13) extends to the mud-water chamber (12), and the overflow port (16) of the cyclone (13) extends to the oil chamber (11); and an oil phase discharge port (18) is arranged on the oil chamber (11), wherein the oil phase discharge port (18) is used to discharge the oil phase; The mud-water coagulation tank comprises a second tank body (20), the second tank body (20) being connected to the mud-water chamber (12) via a mud-water pipe (51); the second tank body (20) is provided with a reagent adding port (21), and the reagent adding port (21) is used to add a flocculating agent; The solid-liquid separation tank comprises a third tank body (30), wherein a filter plate (31) is arranged in the third tank body (30), wherein the filter plate (31) is used to separate the chamber of the third tank body (30) to form a turbid liquid chamber (33) and a solid chamber (34), wherein the solid chamber (34) is located below the turbid liquid chamber (33); and a turbid liquid discharge port (35) is arranged on the turbid liquid chamber (33), wherein the turbid liquid discharge port (35) is used to discharge the turbid liquid phase; The solid chamber (34) is connected to the second tank body (20) via a coagulant pipe (52); a solid phase discharge port (36) is provided at the bottom of the solid chamber (34), and the solid phase discharge port (36) is connected to a solid phase pipe; The solid phase tube comprises an outer straight tube (371) and an inner curved tube (372), wherein the inner curved tube (372) is sleeved inside the outer straight tube; the inner curved tube (372) is provided with a filter hole (373), and the filter hole (373) is used for turbid liquid to pass through; the inner curved tube (372) is used for discharging the solid phase; A water storage tank (374) is provided at the end of the outer straight tube (371), and the water storage tank (374) is provided with a return port (375), and the return port (375) is connected to the mud water coagulation tank through a return pipe (53).
2. A three-phase separation system for drilling fluid according to claim 1, characterized in that: The reflux pipe (53) is provided with a flow valve (38).
3. A three-phase separation system for drilling fluid according to claim 1, characterized in that: The inner layer curved pipe (372) is composed of a plurality of curved pipe units; The curved pipe unit comprises a first straight pipe (376), a second straight pipe (378), a third straight pipe (380), a first connecting pipe (377) and a second connecting pipe (379); the first straight pipe (376) and the second straight pipe (378) are connected via the first connecting pipe (377); and an angle between the first straight pipe (376) and the second straight pipe (378) is greater than 90 degrees; The second straight pipe (378) and the third straight pipe (380) are connected via a second connecting pipe (379), and an included angle between the second straight pipe (378) and the third straight pipe (380) is greater than 90 degrees; The first straight tube (376) extends upward from the second straight tube (378); and the third straight tube (380) extends downward from the second straight tube (378).
4. A three-phase separation system for drilling fluid according to claim 3, characterized in that: The outer convex surface of the first connecting pipe (377) is provided with a filter hole (373).
5. A three-phase separation system for drilling fluid according to claim 4, characterized in that: The inner concave surface of the second connecting pipe (379) is provided with a filter hole (373).
6. A three-phase separation system for drilling fluid according to claim 1, characterized in that: The filter plates (31) include at least two, and a fiber medium (32) is arranged between the two filter plates (31).
7. A three-phase separation system for drilling fluid according to claim 1, characterized in that: The mud-water coagulation tank also includes a stirring component; The stirring assembly comprises a stirring blade (23), a stirring shaft (24) and a driving motor (22); the stirring shaft (24) is connected to a rotating shaft of the driving motor (22); and the driving motor (22) is used to drive the stirring shaft (24) to rotate; The stirring blade (23) is arranged on a stirring shaft (24), and when the stirring shaft (24) rotates, the stirring blade (23) is driven to rotate.
8. A three-phase separation system for drilling fluid according to claim 1, characterized in that: The system also includes a turbid liquid purification tank; The turbid liquid purification tank comprises a fourth tank body (40), wherein a purification assembly (48) is arranged in the fourth tank body (40), and the purification assembly (48) is used to filter particles and separate the chamber of the fourth tank body (40) to form a liquid inlet chamber (41) and a liquid outlet chamber (42); The liquid inlet cavity (41) is connected to the turbid liquid cavity (33) via a turbid liquid tube (54); The liquid outlet cavity (42) is provided with a liquid outlet (44), and the liquid outlet (44) is used to discharge the purified liquid.
9. A three-phase separation system for drilling fluid according to claim 8, characterized in that: The purification component (48) comprises a first sand core layer (45), a multi-medium mixing layer (47) and a second sand core layer (46) which are arranged in sequence.