Slurry circulating system

Abstract

The utility model relates to the technical field of devices for treating drilling fluid outside a borehole, in particular to a slurry circulating system. The slurry circulating system comprises a diversion trench, a slurry stirring pool and a slurry pump, the diversion trench is communicated with a storage pool and the slurry stirring pool, the diversion trench comprises a diversion trench front area and a diversion trench rear area, a slurry filtering device is arranged between the diversion trench front area and the diversion trench rear area, and a slurry settling pool is arranged between the diversion trench front area and the slurry filtering device; the mud filtering device is a filter screen, the lower portion of the filter screen is a sediment blocking part, the upper portion of the filter screen is a mud filtering part, and the mesh number of the mud filtering part is smaller than that of the sediment blocking part. The slurry circulating system can filter slurry entering the slurry stirring pool, reduces blockage of the slurry gun, ensures that the slurry is fully stirred and mixed, improves the uniformity of the slurry, shortens the circulating maintenance time, and improves the overall production efficiency.

Description

TECHNICAL FIELD

[0001] The utility model relates to the device technical field of wellbore external treatment drilling fluid, especially relates to a mud circulating system. BACKGROUND

[0002] The mud is widely used in gas well rescue operation because of the characteristics of adjustable density and specific gravity, excellent rheological property and strong wall forming property. In the process of gas well rescue, the mud used can be adjusted according to the need to adapt to different formation pressure, so as to effectively control the pressure in the wellbore and prevent the further influx of formation fluid (such as natural gas). The rheological properties of the mud include viscosity, dynamic shear force, static shear force and thixotropy, etc. These properties enable the mud to effectively carry cuttings and protect the well wall in the wellbore. The solid particles in the mud can deposit on the well wall to form a layer of dense mud cake, which has excellent sealing performance and can effectively prevent the filtrate in the mud from further invading the formation.

[0003] In the specific production process, the mud is usually stored in a storage pool, but the storage pool has no stirring device. With long-term storage, the mud in the storage pool will form suspended matter and sediment, which is not conducive to use. Therefore, it is necessary to maintain the mud in the storage pool to reduce the formation of suspended matter and sediment, so that the key performance indicators of the mud such as density, viscosity and shear force can be kept within a suitable range, so as to meet the operation requirements, improve the utilization rate of mud, prevent environmental pollution, ensure operation safety and prolong the service life of equipment.

[0004] The mud circulating maintenance process of the prior art is shown in Figure 1 Generally, the mud flows out of the storage pool, enters the stirring pool provided with a stirring device through the flow guide groove, is maintained once, and then returns to the stirring pool for circulating maintenance again under the control of the slurry pump and related valves. After the circulating maintenance is completed, the mud returns to the storage pool or is loaded for use. Through multiple cycles, the performance indicators of the mud can be kept within a suitable range. In the circulating maintenance process, there are dead angle areas in the stirring pool. The traditional stirring method is difficult to reach these areas, so a slurry pump and a mud gun are set to assist the stirring device in the stirring pool. The high-pressure injection of the mud gun can ensure that the mud in these areas is fully stirred and mixed, which helps to prevent the formation of sediment in these areas and maintain the overall uniformity of the mud.

[0005] However, the sediment will enter the mud gun with the slurry pump. Since the mud gun has a small aperture, it is easy to block the gun head. In order to clean the blocked mud gun, a large amount of manpower, material resources and time are consumed, which affects the efficiency of mud circulating maintenance. UTILITY MODEL CONTENTS

[0006] The utility model discloses a mud circulating system can solve the problem that the mud gun head is blocked by too much sediment in the mixing pool and affects the maintenance efficiency of mud circulation.

[0007] In order to solve the above problem, the mud circulating system of the utility model adopts the following technical scheme:

[0008] A mud circulating system comprises a flow guide groove, a mud mixing pool and a slurry pump, the flow guide groove is connected with the mud mixing pool and a storage pool, the flow guide groove comprises a front area and a rear area, a mud filter is arranged between the front area and the rear area, and a mud settling pool is arranged between the front area and the mud filter.

[0009] Further, a mud filter mounting groove is arranged between the rear area and the mud settling pool to mount and fix the mud filter.

[0010] Further, the sediment blocking part and the mud filter part are integrated.

[0011] Further, a frame is arranged around the filter screen to support the filter screen and meet the structural strength required for filtering mud.

[0012] Further, a handle is arranged on the frame to facilitate dismounting and cleaning the filter screen.

[0013] Further, the width of the sediment blocking part accounts for 20% to 40% of the width of the filter screen.

[0014] Further, the width of the sediment blocking part accounts for 25% to 35% of the width of the filter screen.

[0015] Further, the bottom surface of the flow guide groove is a bottom surface with an inclination angle.

[0016] Further, the inclination angle of the bottom surface of the flow guide groove ranges from 10° to 20°.

[0017] Further, a plurality of stirring devices are arranged in the mud mixing pool and evenly distributed in the mud mixing pool.

[0018] Beneficial effects: the mud circulating system of the utility model is improved invention creation. Through the scheme, the big particle impurities in the mud are settled by setting the settling pond; the mud filter device is set for filtering the mud into the mixing pool, removing the impurities or particles therein, and ensuring the mud quality into the mixing pool; the mud filter device with the upper sparse and lower dense structure improves the flow rate of the mud while ensuring the filtering effect. The mud circulating system of the utility model can filter the mud into the mud mixing pool, reduce the mud gun plugging, ensure the mud to be fully stirred and mixed, which not only improves the uniformity of the mud, but also shortens the circulation maintenance time, thereby improving the overall production efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is mud production area process flow chart;

[0020] Figure 2 It is structure schematic view of one embodiment of the mud circulating system of the utility model;

[0021] Figure 3 It is Figure 2 Structure schematic view of mud filter device.

[0022] In the figure: 1, flow guide groove; 2, mud mixing pool; 3, mud settling pond; 4, mud filter device; 5, mud filter device installation groove; 6, mud gun; 11, front area of flow guide groove; 12, rear area of flow guide groove; 40, filter screen; 41, sediment blocking part; 42, mud filtering part; 43, frame; 44, handle. DETAILED DESCRIPTION

[0023] The features and performances of the utility model are further described in detail in combination with embodiments.

[0024] The mud circulating system of the utility model improves the mud quality into the mud mixing pool by setting the mud filter device in the flow guide groove, reduces the mud gun frequency, and thereby improves the mud circulation maintenance efficiency.

[0025] As a basic scheme, the mud circulating system of the utility model is as follows Figure 2As shown, the mud circulating system mainly comprises a flow guide groove 1, a mud stirring pool 2, a slurry pump, the flow guide groove 1 is connected with the storage pool and the mud stirring pool 2, so that the mud can flow smoothly from the storage pool to the mud stirring pool 2, the flow guide groove 1 is divided into a flow guide groove front area 11 and a flow guide groove rear area 12, the flow guide groove front area 11 is connected with the mud settling pool 3, the flow guide groove rear area 12 is connected with the mud stirring pool 2, the flow guide groove front area 11 is used for preliminarily guiding the mud flow, and the flow guide groove rear area 12 is closer to the mud stirring pool 2 and is ready to receive the filtered mud. In this way, the mud is preliminarily filtered before entering the stirring pool 2, most of the impurities are removed, and then the mud is further treated in the mud stirring pool 2. This segmented treatment method helps to improve the filtering effect of the mud and ensures that the quality of the mud entering the mud stirring pool 2 is higher. By adjusting the size, shape of the flow guide groove front area 11 and the flow guide groove rear area 12 and the type and parameters of the mud filtering device, the flow rate of the mud can be flexibly controlled, which helps to adapt to different types of mud and realize more refined mud treatment. The mud filtering device 4 is arranged between the flow guide groove front area 11 and the flow guide groove rear area 12, which comprises a sediment blocking part 41 and a mud filtering part 42 and can effectively filter the impurities in the mud. The mud filtering device 4 is arranged in the flow guide groove 1 to filter the mud entering the stirring pool 2, remove the impurities or particles in the mud and ensure the quality of the mud entering the mud stirring pool 2. The mud in the mud stirring pool 2 is stirred and mixed under the action of the stirring device in the stirring pool 2. The mud settling pool 3 is arranged between the flow guide groove front area 11 and the mud filtering device 4, and the system forms a multi-stage treatment process by adding the mud settling pool 3 between the flow guide groove front area 11 and the mud filtering device 4. The mud first enters the settling pool 3 for preliminary settling, the large particle impurities are precipitated, then the mud enters the mud filtering device 4 for further refined filtering, and finally the mud enters the mud stirring pool 2. The arrangement of the mud settling pool 3 effectively reduces the burden of the mud filtering device 4, so that it can be more focused on removing small particles and impurities. This helps to improve the filtering efficiency, prolong the service life of the mud filtering device 4 and reduce the maintenance cost. According to the characteristics and treatment requirements of the mud, the design of the mud settling pool 3 can be further optimized. For example, more efficient settling techniques, increased settling area or adjustment of the geometric shape of the mud settling pool 3 can be used to improve the settling efficiency and removal effect. The mud filtering device 4 is a filter screen 40. The filter screen 40 as the mud filtering device 4 has a relatively simple structure, is usually made of metal or synthetic material, is easy to install, disassemble and clean. This reduces the maintenance difficulty and cost of the system. The filter screen 40 can effectively intercept the solid particles and impurities in the mud, especially for the impurities with larger particle size, the filtering effect is particularly significant, which helps to maintain the purity of the mud and improve the efficiency of the subsequent process. At the same time, due to its easy replacement and maintenance, the system can maintain a high cost performance in the long-term operation process. Figure 3As shown, the sediment blocking portion 41 is arranged at the lower part of the filter screen 40, and the slurry filtering portion 42 is arranged at the upper part of the filter screen 40. By arranging the sediment blocking portion 41 and the slurry filtering portion 42 on the filter screen 40, the function of layered filtration is achieved. The upper part of the slurry with less impurities passes through the slurry filtering portion 42, and the lower part of the slurry with more impurities passes through the sediment blocking portion 41, removing fine particles, thereby improving the filtering efficiency while ensuring the filtering effect. Through the double action of the slurry settling tank 3 and the slurry filtering device 4, the impurities in the slurry can be effectively removed, and the purity and quality of the slurry can be improved. The zoned flow guide design and the collaborative operation of multiple components make the flow of the slurry in the system more orderly and efficient, reducing the time and energy consumption of the slurry circulation. The slurry circulating system of the utility model sets the slurry filtering device 4 to improve the quality of the slurry and reduce the frequency of the slurry gun 6 being blocked, thereby improving the efficiency of the slurry circulation maintenance.

[0026] As a preferred embodiment, the sediment blocking portion 41 and the slurry filtering portion 42 are of an integrated structure. The integrated structure design makes the sediment blocking portion 41 and the slurry filtering portion 42 more compact in space, reducing the space occupied by the system, and facilitating the efficient deployment of the slurry circulating system in limited space. Since the sediment blocking portion 41 and the slurry filtering portion 42 are integrated into one, the flow path of the slurry when passing through the slurry filtering device 4 is smoother, reducing the flow resistance and thereby improving the filtering efficiency. The integrated structure design simplifies the installation process, as the operator only needs to install one integral component. At the same time, it is more convenient to maintain, as it can be disassembled as a whole for inspection and cleaning. The integrated structure design reduces the connection points between components, thereby reducing the risk of failure of the slurry filtering device 4 due to loose or damaged connections, and enhancing the overall stability of the system. Although the integrated structure design may have a slight increase in initial manufacturing cost, as it reduces the cost of installing, maintaining and replacing components, in the long run, this design may be more cost-effective.

[0027] As a preferred embodiment, the sediment blocking portion 41 and the slurry filtering portion 42 are of an integrated structure. The integrated structure design makes the sediment blocking portion 41 and the slurry filtering portion 42 more compact in space, reducing the space occupied by the system, and facilitating the efficient deployment of the slurry circulating system in limited space. Since the sediment blocking portion 41 and the slurry filtering portion 42 are integrated into one, the flow path of the slurry when passing through the slurry filtering device 4 is smoother, reducing the flow resistance and thereby improving the filtering efficiency. The integrated structure design simplifies the installation process, as the operator only needs to install one integral component. At the same time, it is more convenient to maintain, as it can be disassembled as a whole for inspection and cleaning. The integrated structure design reduces the connection points between components, thereby reducing the risk of failure of the slurry filtering device 4 due to loose or damaged connections, and enhancing the overall stability of the system. Although the integrated structure design may have a slight increase in initial manufacturing cost, as it reduces the cost of installing, maintaining and replacing components, in the long run, this design may be more cost-effective.

[0028] As a preferred embodiment, the filter screen 40 is provided with a frame 43 around its periphery to support the filter screen 40 and meet the structural strength required for filtering the slurry. The addition of the frame 43 significantly enhances the overall structural strength of the filter screen 40, enabling it to withstand the pressure load generated during the filtration of the slurry, ensuring the stability and durability of the filter screen 40. The design of the frame 43 allows the filter screen 40 to be more conveniently installed in the slurry filtration device mounting slot 5, and the frame 43 can serve as a reference for installation and fixation, simplifying the installation process and improving the installation accuracy. The frame 43 not only provides structural support, but also helps maintain the shape and positional stability of the filter screen 40. This helps ensure that the slurry can be evenly distributed when passing through the filter screen 40, thereby improving filtration efficiency and stability. The addition of the frame 43 makes it easier to maintain and replace the filter screen 40, and the operator can easily disassemble and install the filter screen 40 through the frame 43, reducing maintenance costs and time.

[0029] As a preferred embodiment, the frame 43 is provided with a handle 44 for disassembly and cleaning of the filter screen 40. The addition of the handle 44 allows the operator to more conveniently disassemble the filter screen 40, and by holding the handle 44, the operator can easily lift or place the filter screen 40 in the slurry filtration device mounting slot 5, simplifying the disassembly process and improving work efficiency. The handle 44 not only facilitates disassembly, but also helps the operator more conveniently clean the filter screen 40. When the filter screen 40 needs to be cleaned or replaced, the operator can easily remove it through the handle 44 for cleaning or maintenance. When designing the connection between the frame 43 and the handle 44, attention should be paid to the connection strength, and welding, bolt connection or buckle can be used to ensure the firm connection of the handle 44 and the frame 43, preventing them from falling off or being damaged during disassembly or cleaning.

[0030] As a preferred embodiment, the width of the sediment blocking portion 41 accounts for 20% to 40% of the width of the filter screen 40. Large particles tend to settle in the 20% to 40% range at the bottom of the filter screen 40, and the sediment blocking portion 41 can effectively intercept most of the large particles, while ensuring sufficient filtration area to maintain the flow rate of the slurry. An appropriate amount of sediment blocking portion 41 helps maintain the stability of the slurry circulation system, preventing large particles from clogging the pipeline or damaging other system components, ensuring smooth flow of the slurry and normal operation of the system.

[0031] As a preferred embodiment, the width of the sediment blocking portion 41 accounts for 25% to 35% of the width of the filter screen 40. The optimal ratio is 30%, which further balances the relationship between filtration efficiency and flow rate. Although the optimal ratio is 30%, the width range of 25% to 35% provides sufficient flexibility to adapt to the filtration needs under different working conditions. The operator can adjust the width of the sediment blocking portion 41 according to the actual situation to achieve the best filtration effect. The design of the sediment blocking portion 41 enables it to trap impurities more quickly, reducing the accumulation of impurities on the filter screen 40, thereby extending the cleaning cycle of the filter screen 40. At the same time, the sediment blocking portion 41 also helps to improve the filtration precision and ensure the cleanliness of the slurry.

[0032] The flow guide groove 1 is mainly used to guide the flow direction of the slurry, ensuring that the slurry can flow along the predetermined path, thereby effectively transferring from the storage pool to the mixing pool 2. To achieve this function, as a preferred embodiment, the bottom surface of the flow guide groove 1 is designed to have a certain inclination angle. The inclined bottom surface helps the slurry to flow naturally under gravity, reducing the accumulation or stagnation of the slurry in the flow guide groove 1, and helps to improve the working efficiency of the slurry circulation system. The inclined design also reduces the chance of solid particles (such as drill cuttings) in the slurry depositing in the flow guide groove 1, thereby reducing the risk of blockage. By reasonably designing the inclination angle of the flow guide groove 1, the flow rate and flow of the slurry can be more effectively controlled, thereby optimizing the slurry treatment process.

[0033] As a preferred embodiment, the inclination angle of the bottom surface of the flow guide groove 1 ranges from 10° to 20°. The optimal value is 15°, which can provide sufficient gravity component to facilitate the smooth flow of the slurry along the flow guide groove 1. This angle is neither too steep, causing the slurry flow rate to be too fast and possibly causing erosion and wear; nor too gentle, avoiding the risk of slurry accumulation or stagnation. Therefore, 15° is a relatively balanced choice that can ensure the efficiency of slurry flow while reducing the maintenance requirements of the system. The inclination angle of 15° also helps to reduce the deposition of solid particles (such as drill cuttings) in the slurry in the flow guide groove 1. As the slurry flows, these particles are more likely to be carried away, thereby reducing the risk of blockage. This is crucial for maintaining the smooth operation of the slurry circulation system, as blockage not only affects the supply of slurry, but also can cause system failure and increased downtime.

[0034] As a preferred embodiment, a plurality of stirring devices are arranged in the mud mixing tank 2, and the stirring devices are uniformly distributed in the mud mixing tank 2. The stirring devices work together to ensure that the mud is fully mixed and homogenized in the mud mixing tank 2. The plurality of stirring devices are uniformly distributed in the mud mixing tank 2 to ensure that each part of the mud is subjected to uniform stirring. The uniform distribution of the plurality of stirring devices can significantly improve the stirring efficiency of the mud and shorten the stirring time. The rotation speed and stirring intensity of the stirring devices can be adjusted according to the properties of the mud and the processing requirements to achieve the best stirring effect.

[0035] The specific implementation process of the embodiment is as follows: when in use, the mud in the mud storage tank enters the mud settling tank 3 through the front region 11 of the flow guide groove. The mud tank settles and separates the impurities in the mud, removes the impurities in the mud, and improves the quality of the mud. The mud passes through the mud filtering device 4 after passing through the mud settling tank 3, further removing impurities in the mud. After being filtered by the mud filtering device 4, the mud enters the mud mixing tank 2 through the rear region 12 of the flow guide groove. The mud is further stirred in the mud mixing tank 2 by the stirring device to further improve the quality and flow performance of the mud. After the above operation is completed, the mud can be loaded into a vehicle, thereby completing the mud circulation filtration.

[0036] The above is only a preferred embodiment of the present application and does not limit the present application. The patent protection scope of the present application is subject to the claims, and any equivalent structural changes made in accordance with the content of the specification and drawings should also be included in the protection scope of the present application.

Claims

1. A mud circulating system comprising a flow guide tank, a mud mixing tank, and a slurry pump, the flow guide tank communicating a storage tank with the mud mixing tank, characterized by, The guide groove comprises a guide groove front area and a guide groove rear area, a mud filtering device is arranged between the guide groove front area and the guide groove rear area, and a mud settling tank is arranged between the guide groove front area and the mud filtering device; the mud filtering device is a filter screen, the lower part of the filter screen is a sediment blocking part, the upper part of the filter screen is a mud filtering part, and the mesh number of the mud filtering part is smaller than that of the sediment blocking part.

2. The mud circulation system of claim 1, wherein, A mud filtering device mounting groove is arranged between the guide groove rear area and the mud settling tank to mount and fix the mud filtering device.

3. Mud circulation system according to claim 1 or 2, characterized in that The sediment blocking part and the mud filtering part are of an integrated structure.

4. The mud circulation system of claim 3, wherein, A frame is arranged around the filter screen to support the filter screen and meet the structural strength required for filtering mud.

5. The mud circulation system of claim 4, wherein, A handle is arranged on the frame to facilitate disassembly and cleaning of the filter screen.

6. Mud circulation system according to claim 4 or 5, characterized in that The width of the sediment blocking part accounts for 20-40% of the width of the filter screen.

7. The mud circulation system of claim 6, wherein, The width of the sediment blocking part accounts for 25-35% of the width of the filter screen.

8. The mud circulation system of claim 1, wherein, The bottom surface of the guide groove is a bottom surface with an inclination angle.

9. The mud circulation system of claim 8, wherein, The inclination angle of the bottom surface of the guide groove ranges from 10° to 20°.

10. The mud circulation system of claim 1, wherein, A plurality of stirring devices are arranged in the mud stirring tank and are uniformly distributed in the mud stirring tank.

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