A drilling fluid agitator for oil drilling
Patent Information
- Application Number
- CN202621093480.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2026-07-20
- Publication Date
- 2026-10-09
- Estimated Expiration
- 2036-07-20
AI Technical Summary
[0003]当前，石油钻井所使用的钻井液搅拌器大多采用定轴式旋转搅拌结构，其主要由防爆电机、搅拌轴及搅拌叶片组成，工作过程中，搅拌轴安装高度固定，叶片仅能在单一水平面内完成圆周搅动，此种结构扰动范围局限性极大，由于搅拌作业高度固定，致使罐内上下层流体交换能力弱，极易出现钻井液分层现象，造成上层液相药剂分散不均、下层重质固相沉积富集，严重降低钻井液整体均匀混合效果
[0013]通过上述技术方案，本申请用于石油钻井的钻井液搅拌器中，转轴自上而下设有螺纹段与立柱段，螺套滑动设置在罐体内部且与螺纹段螺纹啮合，构成丝杠螺母传动副；搅拌体套在立柱段外侧，可沿轴向（竖直方向）滑动，同时可周向锁止，保证搅拌体跟随转轴同步旋转，通过在搅拌体底部设置弹性件，利用弹性件自身弹性顶压搅拌体，使搅拌体始终贴合螺套下端面，实现螺套、搅拌体刚性贴合联动，使用时，正反转电机转动，驱动转轴带动螺套沿竖直方向移动，螺套配合弹性件使搅拌体沿立柱段平稳移动，同时，转轴转动时能够同步带动搅拌体转动。综上，本申请通过正反转电机正转与反转交替运行，并与转轴、螺套以及弹性件协同，实现搅拌体在旋转搅拌的同时能够上下往复移动，增大了纵向（高度方向）扰动范围，增强了罐体内上下流体交换能力，避免钻井液分层，进而提升钻井液整体均匀混合效果。
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Abstract
Description
Technical Field
[0001] This application relates to the field of oil drilling technology, and more specifically, to a drilling fluid agitator for oil drilling. Background Technology
[0002] Drilling fluid agitators, also known as mud agitators, are key auxiliary equipment in the drilling fluid solids control system of oil and gas drilling engineering. Their core function is to maintain the uniformity and stability of drilling fluid, thereby ensuring the safe and efficient conduct of drilling operations.
[0003] Currently, most drilling fluid agitators used in oil drilling adopt a fixed-axis rotary agitation structure, which mainly consists of an explosion-proof motor, an agitator shaft, and agitator blades. During operation, the agitator shaft is installed at a fixed height, and the blades can only complete circumferential agitation in a single horizontal plane. This structure has a very limited range of disturbance. Due to the fixed agitation height, the fluid exchange capacity between the upper and lower layers in the tank is weak, and drilling fluid stratification is very likely to occur. This results in uneven dispersion of the upper liquid phase reagents and the deposition and enrichment of the lower heavy solid phase, which seriously reduces the overall uniform mixing effect of the drilling fluid. Utility Model Content
[0004] The purpose of this application is to provide a drilling fluid agitator for oil drilling, which can expand the agitation coverage area and improve the overall uniform mixing effect of the drilling fluid.
[0005] To achieve the above objectives, this application provides a drilling fluid agitator for oil drilling, comprising a vertically arranged tank, a reversible motor, an agitation assembly, and a stroke limiting structure. The reversible motor is mounted on the top of the tank, and the agitation assembly is disposed within the tank. The agitation assembly includes a rotating shaft and an agitator body. The rotating shaft is drivenly connected to the reversible motor. The rotating shaft has a threaded section and a column section from top to bottom. A threaded sleeve is slidably disposed within the tank in the vertical direction, and the threaded sleeve engages with the threaded section. The agitator body is sleeved on the column section and can slide vertically along the column section. The agitator body is circumferentially locked to the rotating shaft and rotates synchronously with the rotating shaft. An elastic element is provided at the lower end of the rotating shaft. The elastic element axially supports the bottom side of the agitator body, and the elastic element pushes the agitator body so that the upper surface of the agitator body is in contact with the lower surface of the threaded sleeve. The stroke limiting structure is installed on the threaded section and is used to limit the movement stroke of the threaded sleeve.
[0006] In an optional embodiment, the column section is constructed as a prism structure, the stirring body is an impeller, and the inner hole of the impeller is constructed as a polygonal hole adapted to the column section.
[0007] In an optional embodiment, an annular limiting flange is provided on the outer circumferential surface of the rotating shaft, the elastic element is sleeved on the rotating shaft and located between the annular limiting flange and the stirring body, the lower end of the elastic element abuts against the annular limiting flange, and the upper end of the elastic element is supported on the bottom side of the stirring body.
[0008] In an optional embodiment, a scraping assembly is also included, the scraping assembly including a transverse support rod that is fixedly connected to the rotating shaft vertically, the transverse support rod being located below the annular limiting flange, and a plurality of scraping plates being arranged radially at intervals at the bottom of the transverse support rod.
[0009] In an optional embodiment, the number of scraping components is two, the two scraping components are arranged symmetrically with respect to the rotating axis, and the scraping plates of the two scraping components are staggered in the circumferential direction.
[0010] In an optional embodiment, the threaded sleeve includes a body and an extension extending downward from the bottom outer edge of the body. The body has a threaded hole that engages with the threaded section of the rotating shaft. The extension is constructed as a tubular structure, and the diameter of the extension is larger than the diameter of the threaded hole in the body. An annular groove is formed on the lower inner wall of the extension. An annular boss is provided on the contact surface of the stirring body near the axis. The annular groove and the annular boss are connected by a bearing to rotatably connect the stirring body and the threaded sleeve.
[0011] In an optional embodiment, a plurality of mixing rods are vertically provided on the outer side of the screw sleeve, and each of the mixing rods is staggered in both the circumferential and axial directions.
[0012] In an optional embodiment, a guide post is provided on the top of the tank, and a guide hole is provided on the threaded sleeve to cooperate with the guide post. The guide post and the guide hole are slidably connected to each other to slidably connect the threaded sleeve to the tank.
[0013] Through the above technical solution, in the drilling fluid agitator used in oil drilling, the rotating shaft has a threaded section and a column section from top to bottom. The screw sleeve is slidably disposed inside the tank and engages with the threaded section to form a screw-nut transmission pair. The agitator is sleeved on the outside of the column section and can slide axially (vertically) while being circumferentially locked to ensure that the agitator rotates synchronously with the rotating shaft. By setting an elastic element at the bottom of the agitator, the elastic element itself presses against the agitator, so that the agitator always fits against the lower end face of the screw sleeve, achieving rigid contact and linkage between the screw sleeve and the agitator. In use, the forward and reverse motor rotates, driving the rotating shaft to move the screw sleeve vertically. The screw sleeve, in conjunction with the elastic element, makes the agitator move smoothly along the column section. At the same time, the rotating shaft can synchronously drive the agitator to rotate. In summary, this application achieves the mixing body to move up and down simultaneously while rotating and mixing by alternating forward and reverse rotation of the motor, in conjunction with the rotating shaft, screw sleeve, and elastic components. This increases the longitudinal (height) disturbance range, enhances the fluid exchange capacity within the tank, prevents drilling fluid stratification, and thus improves the overall uniform mixing effect of the drilling fluid.
[0014] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the structure of a drilling fluid agitator for oil drilling provided in some embodiments of this application.
[0016] Figure 2 This is another structural schematic diagram of a drilling fluid agitator for oil drilling provided in some embodiments of this application; Figure 3 This is another structural schematic diagram of a drilling fluid agitator for oil drilling provided in some embodiments of this application; Figure 4 yes Figure 3 A magnified view of a portion of point A in the middle.
[0017] Explanation of reference numerals in the attached drawings: 10, tank body; 11, inlet; 12, outlet; 121, cover; 20, forward and reverse motor; 30, stirring assembly; 31, rotating shaft; 311, threaded section; 312, column section; 313, annular limiting flange; 32, stirring body; 321, annular boss; 33, threaded sleeve; 331, main body; 332, extension; 3321, annular groove; 333, guide column; 34, elastic element; 35, mixing rod; 36, bearing; 40, scraper assembly; 41, transverse support rod; 42, scraper plate. Detailed Implementation
[0018] The specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this application.
[0019] In this application, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the relative positions of the corresponding components in the direction of gravity when they are in use, while "inner" and "outer" refer to their relative positions to the contours of the corresponding components themselves. Furthermore, the terms "first," "second," etc., used in this application are for distinguishing one element from another and do not imply sequentiality or importance. In the following description, when referring to the accompanying drawings, unless otherwise explained, the same reference numerals in different drawings denote the same or similar elements. The above definitions are for explanation and illustration only and should not be construed as limiting this application.
[0020] In some embodiments, reference Figures 1 to 4 As shown, a drilling fluid agitator for oil drilling is provided, including a vertically arranged tank 10, a reversible motor 20, an agitation assembly 30, and a stroke limiting structure. The reversible motor 20 is installed at the top of the tank 10, and the agitation assembly 30 is disposed inside the tank 10. The agitation assembly 30 includes a rotating shaft 31 and an agitator 32. The rotating shaft 31 is connected to the reversible motor 20 for transmission. The rotating shaft 31 has a threaded section 311 and a column section 312 from top to bottom. A threaded sleeve 33 is slidably disposed vertically inside the tank 10. 3. The stirring body 32 is threadedly engaged with the threaded section 311 and is sleeved on the column section 312 and can slide vertically along the column section 312. The stirring body 32 is circumferentially locked with the rotating shaft 31 and rotates synchronously with the rotating shaft 31. The lower end of the rotating shaft 31 is provided with an elastic element 34, which is axially supported on the bottom side of the stirring body 32. The elastic element 34 pushes the stirring body 32 so that the upper surface of the stirring body 32 is in contact with the lower end of the threaded sleeve 33. The stroke limiting structure (not shown in the figure) is installed on the threaded section 311 and is used to limit the movement stroke of the threaded sleeve 33.
[0021] Through the above technical solution, in the drilling fluid agitator used in oil drilling, the rotating shaft 31 is provided with a threaded section 311 and a column section 312 from top to bottom. The screw sleeve 33 is slidably disposed inside the tank body 10 and is threadedly engaged with the threaded section 311 to form a screw-nut transmission pair. The agitator 32 is sleeved on the outside of the column section 312 and can slide along the axial (vertical direction) and can be circumferentially locked to ensure that the agitator 32 rotates synchronously with the rotating shaft 31. By setting an elastic element 34 at the bottom of the agitator 32, the elastic element 34 presses the agitator 32 with its own elasticity, so that the agitator 32 always fits against the lower end face of the screw sleeve 33, realizing the rigid fit and linkage of the screw sleeve 33 and the agitator 32. In use, the forward and reverse motor 20 rotates, driving the rotating shaft 31 to move the screw sleeve 33 in the vertical direction. The screw sleeve 33 cooperates with the elastic element 34 to make the agitator 32 move smoothly along the column section 312. At the same time, when the rotating shaft 31 rotates, it can synchronously drive the agitator 32 to rotate.
[0022] In summary, this application achieves the following by having the forward and reverse motor 20 rotate alternately in both directions, and working in conjunction with the rotating shaft 31, the screw sleeve 33, and the elastic element 34, enabling the stirring body 32 to move up and down while rotating and stirring. This increases the longitudinal (height direction) disturbance range, enhances the fluid exchange capacity within the tank 10, prevents drilling fluid stratification, and thus improves the overall uniform mixing effect of the drilling fluid.
[0023] It should be noted that the tank body 10 adopts an existing storage tank for storing drilling fluid, including an inlet 11, an outlet 12, and a cover 121 for sealing the outlet 12. The cover 121 can be disassembled and installed according to usage requirements so that the outlet 12 is in a closed or open state. The stroke limiting structure can adopt an existing conventional structure. For example, the stroke limiting structure can be set as an annular limiting boss at both ends of the threaded section 311 to limit the maximum upward stroke and the maximum downward stroke of the sleeve 33, so as to prevent the sleeve 33 from coming out of the threaded section 311 or getting stuck.
[0024] In some embodiments, such as Figure 3 As shown, a guide post 333 can be provided on the top of the tank body 10. A guide hole is provided on the threaded sleeve 33 to cooperate with the guide post 333. The guide post 333 and the guide hole are slidably connected to each other to slidably connect the threaded sleeve 33 and the tank body 10. The number of guide posts 33 can be set to one or two, which are used to guide the threaded sleeve 33 to move in the vertical direction.
[0025] In some embodiments, such as Figure 2 and Figure 3As shown, the column section 312 can be constructed as a prism structure, and the stirring body 32 is an impeller. The inner hole of the impeller is constructed as a polygonal hole that fits the column section 312. Specifically, the column section 312 can be constructed as a pentagonal prism or a hexagonal prism. Through the cooperation of the prism and the polygonal hole, circumferential limiting and locking and torque transmission are achieved. At the same time, it ensures that the stirring body 32 can slide smoothly. The structure is simple and easy to process.
[0026] In some embodiments, such as Figure 2 As shown, an annular limiting flange 313 may be provided on the outer circumferential surface of the rotating shaft 31. An elastic element 34 is sleeved on the rotating shaft 31 and located between the annular limiting flange 313 and the stirring body 32. The lower end of the elastic element 34 abuts against the annular limiting flange 313, and the upper end of the elastic element 34 is supported on the bottom side of the stirring body 32. In the above technical solution, the annular limiting flange 313 provides a fixed support base for the elastic element 34, restricting the downward movement of the elastic element 34 and achieving axial positioning of the elastic element 34. The elastic element 34 can be a compression spring or elastic rubber, capable of continuously applying an upward pushing force to the stirring body 32.
[0027] In some embodiments, such as Figure 2 and Figure 3 As shown, the drilling fluid agitator for oil drilling may also include a scraper assembly 40. The scraper assembly 40 includes a transverse support rod 41 that is vertically fixedly connected to the rotating shaft 31. The transverse support rod 41 is located below the annular limiting flange 313. Multiple scraper plates 42 are arranged radially at intervals at the bottom of the transverse support rod 41. The scraper assembly 40 can rotate synchronously with the rotating shaft 31 and is arranged close to the bottom of the tank 10. The scraper plates 42 are made of hard alloy wear-resistant plate, which has high hardness and erosion resistance. When the rotating shaft 31 drives the scraper plates 42 to make a circular rotation, the shearing and scraping action of the scraper plate 42 strips away the compacted barite and rock cuttings deposits at the bottom of the tank 10, breaks up the solid phase accumulation layer, eliminates the stirring dead zone at the bottom of the tank 10, and reduces the long-term deposition and hardening of the solid phase.
[0028] In some embodiments, such as Figure 2 and Figure 3 As shown, there can be two scraper assemblies 40. The two scraper assemblies 40 are symmetrically arranged with respect to the rotating shaft 31, and the scraper blades 42 of the two scraper assemblies 40 are staggered in the circumferential direction. The symmetrical arrangement ensures the dynamic balance of the rotating shaft 31, and the staggered scraper blades 42 can fully cover the bottom area of the tank 10, thoroughly remove the deposited solid phase, and further reduce the risk of drilling fluid stratification and bottom enrichment.
[0029] In some embodiments, such as Figures 2 to 4As shown, the screw sleeve 33 may include a body 331 and an extension 332 extending downward from the bottom outer edge of the body 331. The body 331 has a threaded hole that engages with the threaded section 311 of the rotating shaft 31. The extension 332 is constructed as a tubular structure, and the diameter of the hole in the extension 332 is larger than the diameter of the threaded hole in the body 331. An annular groove 3321 is provided on the lower inner wall of the extension 332. An annular boss 321 is provided on the mating surface of the stirring body 32 near the axis. The annular groove 3321 and the annular boss 321 are connected by a bearing 36 to rotatably connect the stirring body 32 and the screw sleeve 33. In the above technical solution, the screw sleeve 33 adopts a split structure, with the main body 331 threadedly engaged with the threaded section 311 of the rotating shaft 31, enabling the screw sleeve 33 to move up and down; the mixing body 32 and the screw sleeve 33 are rotatably connected by the bearing 36, ensuring that the mixing body 32 can rotate relative to the screw sleeve 33, ensuring that the combined motion of the rotation of the mixing body 32 and the sliding of the screw sleeve 33 does not interfere with each other, and ensuring the stability of the transmission.
[0030] In some embodiments, such as Figure 2 and Figure 3 As shown, multiple mixing rods 35 are vertically arranged on the outer surface of the screw sleeve 33, and each mixing rod 35 is staggered in both the circumferential and axial directions. Through the above arrangement, during the up-and-down movement of the screw sleeve 33, the mixing rods 35 are driven to reciprocate and disturb the upper part of the tank 10. Together with the rotating agitator 32 at the bottom and the scraper assembly 40 at the bottom, a three-dimensional mixing flow field of upper, middle and lower layers is formed. Compared with the traditional single-layer mixing method, the uniformity of drilling fluid mixing is improved in all aspects.
[0031] Please refer to Figures 1 to 4 When the drilling fluid agitator of this application is used in oil drilling, the forward and reverse motor 20 is started to drive the rotating shaft 31 to rotate at a constant speed. Since the screw sleeve 33 is axially limited and cannot rotate, the threaded section 311 of the rotating shaft 31 and the screw sleeve 33 form a screw nut transmission pair, which converts the rotational motion into the vertical linear motion of the screw sleeve 33. The elastic element 34 continuously pushes the agitator 32 to fit against the lower end face of the screw sleeve 33, and the agitator 32 and the screw sleeve 33 are rotatably connected through the bearing 36, so that the agitator 32 slides up and down synchronously with the screw sleeve 33. At the same time, the column section 312 cooperates with the inner hole of the agitator 32, driving the agitator 32 to rotate continuously, and finally realizing the composite motion of the rotation and axial reciprocating movement of the agitator 32. During the rotation of the shaft 31, the scraper assembly 40 rotates synchronously with the shaft 31, and the scraper plate 42 continuously scrapes the solid phase deposited at the bottom of the tank 10; the mixing rod 35 on the outside of the screw sleeve 33 moves up and down with the screw sleeve 33, disturbing the drilling fluid in the upper part of the tank 10. The forward and reverse motor 20 switches between forward and reverse directions to enable the stirring body 32 to reciprocate and lift, expanding the longitudinal (axial or height) stirring range and forming a three-dimensional stirring flow field throughout the entire area. This avoids drilling fluid stratification and solid phase deposition, and significantly improves the stirring and mixing effect.
[0032] The preferred embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this application, various simple modifications can be made to the technical solution of this application, and these simple modifications all fall within the protection scope of this application.
[0033] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, this application will not describe the various possible combinations separately.
[0034] Furthermore, various different implementations of this application can be combined in any way, as long as they do not violate the spirit of this application, they should also be regarded as the content disclosed in this application.
Claims
1. A drilling fluid agitator for oil drilling, characterized in that, It includes a vertically arranged tank (10), a forward and reverse motor (20), a stirring assembly (30), and a stroke limiting structure; The forward and reverse motor (20) is installed at the top of the tank (10), and the stirring assembly (30) is disposed inside the tank (10); The stirring assembly (30) includes a rotating shaft (31) and a stirring body (32). The rotating shaft (31) is connected to the forward and reverse rotating motor (20) for transmission. The rotating shaft (31) has a threaded section (311) and a column section (312) from top to bottom. A threaded sleeve (33) is slidably arranged in the vertical direction inside the tank (10). The threaded sleeve (33) is threadedly engaged with the threaded section (311). The stirring body (32) is sleeved on the column section (311). 2) It can slide vertically along the column section (312), the stirring body (32) is circumferentially locked with the rotating shaft (31) and rotates synchronously with the rotating shaft (31); the lower end of the rotating shaft (31) is provided with an elastic element (34), the elastic element (34) is axially supported on the bottom side of the stirring body (32), and the elastic element (34) pushes the stirring body (32) so that the upper surface of the stirring body (32) is in contact with the lower end of the screw sleeve (33); The travel limit structure is installed on the threaded section (311) and is used to limit the travel of the threaded sleeve (33).
2. The drilling fluid agitator for oil drilling according to claim 1, characterized in that, The column section (312) is constructed as a prism structure, the stirring body (32) is an impeller, and the inner hole of the impeller is constructed as a polygonal hole adapted to the column section (312).
3. The drilling fluid agitator for oil drilling according to claim 1, characterized in that, The outer circumferential surface of the rotating shaft (31) is provided with an annular limiting flange (313). The elastic element (34) is sleeved on the rotating shaft (31) and located between the annular limiting flange (313) and the stirring body (32). The lower end of the elastic element (34) abuts against the annular limiting flange (313), and the upper end of the elastic element (34) is supported on the bottom side of the stirring body (32).
4. The drilling fluid agitator for oil drilling according to claim 3, characterized in that, It also includes a scraper assembly (40), which includes a transverse support rod (41) that is vertically fixed to the rotating shaft (31). The transverse support rod (41) is located below the annular limiting flange (313), and a plurality of scraper plates (42) are arranged radially at intervals at the bottom of the transverse support rod (41).
5. The drilling fluid agitator for oil drilling according to claim 4, characterized in that, The number of scraper components (40) is two, the two scraper components (40) are arranged symmetrically with respect to the rotating shaft (31), and the scraper plates (42) of the two scraper components (40) are staggered in the circumferential direction.
6. The drilling fluid agitator for oil drilling according to claim 1, characterized in that, The threaded sleeve (33) includes a body (331) and an extension (332) extending downward from the bottom outer edge of the body (331), the body (331) having a threaded hole that engages with the threaded section (311) of the shaft (31). The extension (332) is constructed as a tubular structure, and the diameter of the extension (332) is larger than the diameter of the threaded hole of the body (331). The inner wall of the lower end of the extension (332) is provided with an annular groove (3321). The mating surface of the stirring body (32) is provided with an annular boss (321) near the axis. The annular groove (3321) and the annular boss (321) are connected by a bearing (36) to rotatably connect the stirring body (32) and the threaded sleeve (33).
7. The drilling fluid agitator for oil drilling according to claim 6, characterized in that, Multiple mixing rods (35) are vertically arranged on the outer side of the screw sleeve (33), and each mixing rod (35) is staggered in both the circumferential and axial directions.
8. The drilling fluid agitator for oil drilling according to claim 1, characterized in that, The top of the tank (10) is provided with a guide post (333), and a guide hole is opened on the threaded sleeve (33) to cooperate with the guide post (333). The guide post (333) and the guide hole are slidably connected to each other so as to slidably connect the threaded sleeve (33) and the tank (10).