Centralizer with diversion trench

Abstract

The invention relates to the technical field of centralizers, in particular to a centralizer with a diversion trench. Comprising a centralizing body, first centralizing assemblies, second centralizing assemblies and a controller, the centralizing body is provided with a plurality of centralizing blocks and flow guide grooves at intervals in the circumferential direction of the centralizing body, the flow guide grooves are formed between every two adjacent centralizing blocks, each centralizing block is provided with one first centralizing assembly and two second centralizing assemblies, and pressure sensors are arranged in the second centralizing assemblies; a flow sensor is embedded in the diversion trench; a flow threshold value is set, and when the flow value detected by the flow sensor is smaller than or equal to the flow threshold value, the first righting assembly works; when the flow value detected by the flow sensor is larger than a flow threshold value, the second righting assembly works; when the second righting assembly works, the controller controls the second righting assembly to move according to the flow value detected by the flow sensor and the pressure value detected by the pressure sensor. The device is suitable for adjusting and supporting under different well diameter conditions, and the supporting stability is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of centralizers, and in particular to a centralizer with a flow guiding groove. Background Art

[0002] A centralizer, also known as a stabilizer, is a tool for stabilizing downhole drill tools and preventing deviation, which is used to stabilize the drilling direction; the centralizer is mainly used for centralizing the casing to ensure the smooth operation of the slender drill pipe and make the axis of the drill bit as close as possible to the center line of the borehole; most of the existing centralizers are divided into two types. One is a rigid centralizer, which has good supporting force but cannot change the diameter and has a small applicable range; the other is an elastic centralizer, which can change the diameter but has poor supporting force and is prone to deviation.

[0003] Chinese Patent CN105781443A discloses a variable-diameter centralizer, which includes: a central pipe body; a plurality of centralizing strips circumferentially and evenly arranged on the outer side of the central pipe body. The centralizing strips include an axially sliding section, an upper connecting section, a wellbore contact section, and a lower connecting section that are sequentially hinged from top to bottom. The lower connecting section is hinged to the central pipe body; a radial elastic distance adjusting device connected between the wellbore contact section and the outer side of the central pipe; an elastic limiting device sleeved on the central pipe and in contact with the outer sides of the axially sliding sections. However, the above centralizer can only be applied at positions where the well diameter is the same up and down, and its adaptability is low; at the same time, the outer wall of the centralizer usually passes through well fluid, and the above centralizer does not consider the influence of the well fluid on its supporting force.

[0004] Therefore, there is an urgent need to provide a centralizer with a flow guiding groove, which is suitable for adjustment and support in different well diameter conditions compared with the prior art, and improves the support stability. Summary of the Invention

[0005] The present invention solves the technical problems existing in the prior art and provides a centralizer with a flow guiding groove.

[0006] To achieve the above object, the technical solution adopted by the present invention is as follows: The centralizer with a diversion groove includes a centralizing body, a first centralizing component, a second centralizing component and a controller. The centralizing body is sleeved on the outer wall of the casing. The centralizing body is provided with a plurality of centralizing blocks and diversion grooves at intervals along its circumferential direction. The diversion grooves are arranged between two adjacent centralizing blocks. Each centralizing block is provided with one first centralizing component and two second centralizing components. The second centralizing component includes an electric push rod, a first rotating rod, a second rotating rod and a support block. A second groove is provided on the side wall of the centralizing block. The electric push rod is connected to the inner side wall of the second groove. The output end of the electric push rod is rotatably connected to one end of the first rotating rod. The other end of the first rotating rod is rotatably connected to the inner wall of the support block. One end of the second rotating rod is rotatably connected to the inner wall of the support block. The other end of the second rotating rod is rotatably connected to the inner side wall of the second groove connected to the electric push rod. A pressure sensor is arranged on the outer wall of the support block; a flow sensor is embedded in the diversion groove. The pressure sensor and the flow sensor are both electrically connected to the controller; Set a flow threshold. When the flow value detected by the flow sensor is less than or equal to the flow threshold, the first centralizing component works; when the flow value detected by the flow sensor is greater than the flow threshold, the second centralizing component works; when the second centralizing component works, the controller controls the movement of the electric push rod according to the flow value detected by the flow sensor and the pressure value detected by the pressure sensor.

[0007] Further, the average value of the flow values detected by all flow sensors obtained at each moment is taken to obtain the real-time flow value at that moment. The two second centralizing components are arranged vertically and distributed on the outer wall of the centralizing block. All the second centralizing components arranged above the centralizing body are set as a group, and all the second centralizing components arranged below the centralizing body are set as another group. The controller controls the movement of the electric push rod according to the real-time flow value and the pressure value detected by the pressure sensor. The specific method is as follows: (1) When and P are both 0, or, and , the controller controls the electric push rods in the same group to accelerate at the first acceleration; (2) When both , are satisfied at the same time, the controller controls the electric push rods in the same group to decelerate at the second acceleration; (3) When is satisfied, the controller controls the electric push rods in the same group to stop moving; In the above formula, represents the real-time flow value, P represents the pressure value detected by the pressure sensor, represents the maximum value of the pressure values detected by the pressure sensor, represents the first flow rate set value, represents the maximum pressure value that the second rotating rod can withstand along its length direction, represents the flow rate threshold.

[0008] Furthermore, the first acceleration and the second acceleration satisfy the following relationship: ; In the above formula, represents the first acceleration, represents the second acceleration.

[0009] Furthermore, the flow rate threshold is set according to the well fluid flow rate values of the previously drilled wells in the area where the centralizer is installed, and is specifically calculated by the following formula: ; In the above formula, represents the flow rate threshold, represents the maximum value among the well fluid flow rate values of the previously drilled wells in previous years, represents the minimum value among the well fluid flow rate values of the previously drilled wells in previous years, represents the maximum average flow rate, represents the minimum average flow rate, represents the maximum flow rate value that the support piece can withstand.

[0010] Furthermore, 、 The specific method for obtaining is as follows: perform clustering analysis on the obtained well fluid flow rate values of the previously drilled wells in previous years to obtain K clusters, sort the K clusters from largest to smallest according to the size of the cluster centers, and take the average value of the flow rate values within the first N / K clusters as , and take the average value of the flow rate values within the last N / K clusters as , N represents the number of years of the obtained well fluid flow rate values of the drilled wells, and K is set to be greater than N.

[0011] Furthermore, the centralizer further includes a crushing component. A plurality of the crushing components are arranged at intervals along the circumferential direction of the lower end surface of the centralizing block. Each crushing component includes a motor and a drill bit. The motor is embedded in the lower end surface of the centralizing block, the output end of the motor is fixedly connected to the drill bit, and the motor is electrically connected to the controller.

[0012] Furthermore, when one or more of the pressure sensors installed on the second centralizing component located below detect pressure values in the non-working state, the motor is started, and the motor drives the drill bit to crush the well wall at the lower end of the centralizing body.

[0013] Furthermore, each straightening block is provided with a connecting groove, and both ends of the connecting groove are respectively connected with the guide grooves adjacent to the straightening block where it is located, and all the connecting grooves are located in the same horizontal plane. Each connecting groove is provided with a solenoid valve, and the solenoid valve is electrically connected to the controller. The controller controls the opening of the solenoid valve according to the flow value detected by the flow sensor.

[0014] Furthermore, the specific method for the controller to control the opening of the solenoid valve according to the flow value detected by the flow sensor is: (1) When When , the controller controls the opening of all solenoid valves to 100%; (2) When When the controller controls the opening of all solenoid valves to %; (3) When When the controller controls the opening of all solenoid valves to %; In the above formula, n represents the total number of flow sensors set. It indicates the maximum value of the flow difference obtained by subtracting any two of the total flow values. It means the average value of the flow difference obtained by subtracting any two of the total flow values. It indicates the total number of flow difference values ​​obtained by subtracting any two of the total flow values.

[0015] Furthermore, the first straightening assembly includes a spring, a support plate and a slider, the straightening block is provided with a first groove and a slide groove, one end of the spring is fixedly connected to the bottom of the first groove, the other end of the spring is fixedly connected to the inner wall of the support plate, one end of the support plate is fixedly connected to the slider, the slider is slidably connected inside the slide groove, the other end of the support plate is fixedly connected to the outer wall of the straightening block, and the support plate is elastic.

[0016] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention provides a first righting assembly and a second righting assembly. The first righting assembly or the second righting assembly is applicable to different flow values ​​in the well. When the real-time flow value is less than or equal to the flow threshold, that is, when the flow rate is small, the first righting assembly is used. The first righting assembly can well support the casing and avoid the waste of the second righting assembly when the flow rate is small, thereby increasing the service life of the second righting assembly. When the real-time flow value is greater than the flow threshold, that is, when the flow rate is large, the second righting assembly is used. When the flow rate is large, the supporting force of the first righting assembly is insufficient and the casing cannot be well supported. At this time, the second righting assembly is used to ensure that the second righting assembly is dynamically adjusted under the condition of large and complex flow rates to ensure the supporting force for the casing. Two sets of second righting assemblies are provided, which can be applicable when different positions of the righting body correspond to different well diameters, and can be adjusted and supported under different well diameter conditions, thereby further improving the supporting stability of the righting device of the present invention.

[0017] (2) The present invention also adjusts the opening of the solenoid valve according to different situations through the controller. When the flow value in a certain guide groove is too large, the liquid in the large flow guide groove can be conducted to other guide grooves to ensure that the flow values ​​in all directions of the righting body are relatively even, thereby preventing the righting body from tilting under the action of the large flow well fluid. At the same time, it can also ensure that the external force borne by the second righting assembly in all directions is even, thereby further ensuring the stability of the second righting assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 It is a front-view cross-sectional view showing the internal structure of the straightening block of the present invention.

[0020] Figure 3 It is a cross-sectional view of the present invention from a top view angle.

[0021] Description of reference numerals: 1. The straightening body; 11. The straightening block; 12. The guide groove; 13. The first groove; 14. The second groove; 15. The slide groove; 16. The connecting groove; 17. The solenoid valve; 2. The first straightening assembly; 21. The spring; 22. The support sheet; 23. The slider; 3. The second straightening assembly; 31. The electric push rod; 32. The first rotating rod; 33. The second rotating rod; 34. The support block; 35. The pressure sensor; 4. The flow sensor; 5. The motor; 6. The drill bit; 7. The casing. DETAILED DESCRIPTION

[0022] The technical solution of the present invention will be clearly described below in conjunction with the accompanying drawings. Obviously, the described embodiments are not all embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention. It should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0023] As Figure 1 shown, the present invention provides a centralizer with a flow guiding groove, which includes a centralizing body 1, a first centralizing component 2, a second centralizing component 3, a crushing component and a controller. The centralizing body 1 is a cylindrical structure, and the centralizing body 1 is sleeved on the outer wall of the casing 7. The centralizing body 1 is provided with a plurality of centralizing blocks 11 and a plurality of flow guiding grooves 12 at circumferential intervals. One flow guiding groove 12 is arranged between two adjacent centralizing blocks 11. The width of the flow guiding groove 12 is smaller than the width of the centralizing block 11. The first centralizing component 2 and the second centralizing component 3 are both arranged on the centralizing block 11. The first centralizing component 2 is used when the flow rate is less than or equal to the flow rate threshold, and the second centralizing component 3 is used when the flow rate in the well is greater than the flow rate threshold. Both the first centralizing component 2 and the second centralizing component 3 play a supporting role. The crushing component is arranged at the lower end of the centralizing body 1, and the crushing component is used for crushing the well wall at the lower end of the centralizing body 1; the controller is electrically connected to the second centralizing component 3 and the crushing component respectively.

[0024] As Figure 1 、 Figure 2 shown, each centralizing block 11 is provided with a first centralizing component 2 and two second centralizing components 3. Each centralizing block 11 is provided with a first groove 13 and a second groove 14. The first grooves 13 and the second grooves 14 arranged on each centralizing block 11 are spaced apart. The first centralizing component 2 is arranged corresponding to the position of the first groove 13, and the second centralizing component 3 is arranged inside the second groove 14. Two second centralizing components 3 are arranged inside each second groove 14. The two second centralizing components 3 are arranged along the axial direction of the centralizing body 1. The two second centralizing components 3 arranged inside the same second groove 14 are arranged oppositely; a sliding groove 15 is further arranged on the centralizing block 11, and the sliding groove 15 is arranged above the first groove 13.

[0025] The first straightening component 2 includes a spring 21, a support piece 22 and a slider 23. One end of the spring 21 is fixedly connected to the inner bottom of the first groove 13, and the other end of the spring 21 is fixedly connected to the middle of the inner wall of the support piece 22. The support piece 22 is elastic and arc-shaped. The upper end of the inner wall of the support piece 22 is fixedly connected to the slider 23. The slider 23 is slidably connected inside the chute 15. The slider 23 can only move axially relative to the chute 15 along the straightening block 11 and cannot move circumferentially relative to the chute 15 along the straightening block 11. The lower end of the support piece 22 is fixedly connected to the outer wall of the straightening block 11. When the flow rate of the well fluid is less than or equal to the flow rate threshold, the second straightening component 3 does not work, and only the spring 21 and the support piece 22 support the casing 7.

[0026] The second straightening component 3 includes an electric push rod 31, a first rotating rod 32, a second rotating rod 33 and a support block 34. One end of the electric push rod 31 away from the output end is connected to the side wall of the second groove 14. The output end of the electric push rod 31 is rotatably connected to the first rotating rod 32. One end of the first rotating rod 32 away from the electric push rod 31 is rotatably connected to the inner wall of the support block 34. The second rotating rod 33 is also rotatably connected to the inner wall of the support block 34. One end of the second rotating rod 33 away from the support block 34 is rotatably connected to the side wall of the first groove 13 connected to the electric push rod 31. The first rotating rod 32 and the second rotating rod 33 are arranged in a staggered manner, and there is no interference between the first rotating rod 32 and the second rotating rod 33. The support block 34 is arc-shaped, the convex surface of the arc of the support block 34 faces the well wall, and the concave surface of the arc of the support block 34 faces the first groove 13. A pressure sensor 35 is embedded at the most prominent position of the convex surface of the support block 34, and the sensing area of the pressure sensor 35 is flush with the most prominent position of the convex surface of the support block 34. When the flow rate of the well fluid is greater than the flow rate threshold, the controller controls the movement of the electric push rod 31 according to the well flow rate value and the pressure value detected by the pressure sensor 35, so as to control the second straightening component 3 to perform dynamic support and maintain the stability of the casing 7. When the second straightening component 3 is in the non-working state, the inner wall of the support block 34 is attached to the outer wall of the straightening block 11, and the thickness of the support block 34 is the same as the thickness of the support piece 22; this can ensure that when the support piece 22 is working, the support block 34 does not contact the well wall and is not worn.

[0027] Such as Figure 3As shown in the figure, each centralizing block 11 is internally provided with an arc-shaped communication groove 16. The communication grooves 16 provided in different centralizing blocks 11 are located in a horizontal plane. Both ends of the communication groove 16 are communicated with the adjacent diversion grooves 12 of the centralizing block 11. An electromagnetic valve 17 is provided inside each communication groove 16, and the electromagnetic valve 17 is used to control the opening degree of the communication groove 16 where it is located; a flow sensor 4 is embedded in the inner wall of each communication groove 16. The flow sensors 4 provided in different communication grooves 16 are all in a horizontal plane, and the installation position of the flow sensor 4 is above the communication groove 16; the controller controls the opening degree of the electromagnetic valve 17 according to the flow value detected by the flow sensor 4.

[0028] The controller is electrically connected to all the electric push rods 31, all the electromagnetic valves 17, all the pressure sensors 35, and all the flow sensors 4 respectively. The second centralizing assemblies 3 provided above and below in the first groove 13 are each a group, and each group of second centralizing assemblies 3 can work independently to adapt to different well diameters.

[0029] The flow threshold is set according to the well fluid flow values of the wells drilled in previous years in the area where the centralizer is installed, and is specifically calculated by the following formula: ; ; In the above formula, represents the flow threshold, represents the maximum value among the well fluid flow values of the wells drilled in previous years, represents the minimum value among the well fluid flow values of the wells drilled in previous years, represents the maximum average flow rate, represents the minimum average flow rate, represents the maximum flow value that the support piece 22 can withstand, represents the density of the well fluid, represents the elastic coefficient of the support piece 22, represents the maximum deformation amount of the support piece 22.

[0030] 、 The specific method for obtaining is as follows: perform cluster analysis on the obtained well fluid flow values of the wells drilled in previous years to obtain K clusters, sort the K clusters from largest to smallest according to the cluster centers, and take the average value of the flow values within the first N / K clusters as , take the average value of the flow values within the last N / K clusters as

[0031] The average value of the flow values detected by all the flow sensors 4 at each moment is taken to obtain the real-time flow value at that moment. The controller controls the movement of the electric push rod 31 according to the real-time flow value and the pressure value detected by the pressure sensor 35. The specific method is as follows: (1) When and P are both 0, or, and at this time, the controller controls the electric push rods 31 in the same group to accelerate at the first acceleration.

[0032] (2) When and are satisfied simultaneously, the controller controls the electric push rods 31 in the same group to decelerate at the second acceleration.

[0033] (3) When is satisfied, the controller controls all the electric push rods 31 in the same group to stop moving.

[0034] Among them, the following relationship is satisfied between the first acceleration and the second acceleration: ; In the above formula, represents the first acceleration, represents the second acceleration, represents the real-time flow value, P represents the pressure value detected by the pressure sensor 35, represents the maximum value among the pressure values detected by the pressure sensor 35, represents the first flow set value, represents the maximum pressure value that the second rotating rod 33 can withstand along its length direction.

[0035] The first flow set value is calculated according to the following formula: .

[0036] The specific method for the controller to adjust the opening degree of the solenoid valve 17 according to the flow value detected by the flow sensor 4 is as follows: (1) When , the controller controls the opening degree of all the solenoid valves 17 to be 100%.

[0037] (2) When , the controller controls the opening degree of all the solenoid valves 17 to be %.

[0038] (3) When , the controller controls the opening degree of all the solenoid valves 17 to be %.

[0039] In the above formula, n represents the total number of the flow sensors 4 set, represents the maximum value among the flow differences obtained by subtracting any two of all the flow values from each other. represents the average value of the flow differences obtained by subtracting any two of all the flow values from each other. represents the total number of the flow differences obtained by subtracting any two of all the flow values from each other.

[0040] As Figure 2 shown, the crushing components are arranged at intervals along the circumferential direction of the centralizer body 1. Each crushing component is arranged at the lower end face of the centralizer body 1. Each crushing component includes a motor 5 and a drill bit 6. The motor 5 is embedded in the lower end face of the centralizer body 1. The output end of the motor 5 is fixedly connected to the drill bit 6. The drill bit 6 extends out of the lower end face of the centralizer body 1. The motor 5 is also electrically connected to the controller. When one or more of the pressure sensors 35 installed on the lower second centralizer component 3 detect pressure values in the non-working state, the motor 5 is started, and the motor drives the drill bit 6 to crush the wellbore wall at the lower end of the centralizer body 1.

[0041] The present invention provides a first centralizer component 2 and a second centralizer component 3, and the first centralizer component 2 or the second centralizer component 3 is applicable to different flow values in the well. When the real-time flow value is less than or equal to the flow threshold, that is, in the case of small flow, the first centralizer component 2 is used. The first centralizer component 2 can well support the casing 7 and avoid waste caused by using the second centralizer component 3 in the case of small flow, and improve the service life of the second centralizer component 3. When the real-time flow value is greater than the flow threshold, that is, in the case of large flow, the second centralizer component 3 is used. When the flow value is large, the supporting force of the first centralizer component 2 is insufficient and cannot well support the casing 7. At this time, the second centralizer component 3 is used to ensure that the second centralizer component 3 is dynamically adjusted under the condition of large and complex flow to ensure the supporting force for the casing 7.

[0042] The present invention provides two groups of second centralizer components 3, which can be applicable when the centralizer body 1 corresponds to different wellbore diameters at different positions, and can be adjusted and supported in different wellbore diameter cases, further improving the supporting stability of the centralizer of the present invention.

[0043] The present invention also adjusts the opening degree of the solenoid valve 17 by the controller in different cases. When the flow value in a certain flow guiding groove 12 is too large, the liquid in the large-flow flow guiding groove 12 can be conducted to other flow guiding grooves 12 to ensure that the flow values in all directions of the centralizer body 1 are relatively average, avoid the centralizer body 1 from tilting under the action of large-flow well fluid, and at the same time ensure that the external forces borne by the second centralizer component 3 in all directions are uniform, further ensuring the stability of the second centralizer component 3.

[0044] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, rather than limiting the protection scope of the present invention. Any simple modification or equivalent replacement made by those of ordinary skill in the art to the technical solution of the present invention shall not depart from the essence and scope of the technical solution of the present invention.

Claims

1. A centralizer with a guide groove, characterized in that: The invention comprises a righting body, a first righting assembly, a second righting assembly and a controller, wherein the righting body is sleeved on the outer wall of the casing, the righting body is provided with a plurality of righting blocks and guide grooves at intervals along its circumference, the guide groove is provided between two adjacent righting blocks, each righting block is provided with one first righting assembly and two second righting assemblies, the second righting assembly comprises an electric push rod, a first rotating rod, a second rotating rod and a support block, a second groove is provided on the side wall of the righting block, the electric push rod is connected to the inner side wall of the second groove, the output end of the electric push rod is rotatably connected to one end of the first rotating rod, the other end of the first rotating rod is rotatably connected to the inner wall of the support block, one end of the second rotating rod is rotatably connected to the inner wall of the support block, the other end of the second rotating rod is rotatably connected to the inner side wall of the second groove connected to the electric push rod, and a pressure sensor is provided on the outer wall of the support block; a flow sensor is embedded in the guide groove, and the pressure sensor and the flow sensor are both electrically connected to the controller; A flow threshold is set, and when the flow value detected by the flow sensor is less than or equal to the flow threshold, the first righting component works; When the flow value detected by the flow sensor is greater than the flow threshold, the second righting component works; When the second righting assembly is working, the controller controls the movement of the electric push rod according to the flow value detected by the flow sensor and the pressure value detected by the pressure sensor.

2. The centralizer with guide groove according to claim 1, characterized in that: The flow values ​​detected by all flow sensors acquired at each moment are averaged to obtain the real-time flow value at that moment. Two second righting assemblies are distributed and arranged on the upper and lower outer walls of the righting block. All second righting assemblies arranged above the righting body are set as one group, and all second righting assemblies arranged below the righting body are set as another group. The controller controls the movement of the electric push rod according to the real-time flow value and the pressure value detected by the pressure sensor. The specific method is as follows: (1) When satisfied and P is 0, or, and When the controller controls the electric push rods in the same group to perform acceleration motion according to the first acceleration; (2) When both , When the controller controls the electric push rods in the same group to perform deceleration motion according to the second acceleration; (3) When satisfied When the controller controls the electric push rods in the same group to stop moving; In the above formula, represents the real-time flow value, P represents the pressure value detected by the pressure sensor, Indicates the maximum value of the pressure value detected by the pressure sensor. Indicates the first flow setting value, Indicates the maximum pressure value that the second rotating rod can withstand along its length direction. Indicates the traffic threshold.

3. The centralizer with guide groove according to claim 2, characterized in that: The first acceleration and the second acceleration satisfy the following relationship: ； In the above formula, represents the first acceleration, Represents the second acceleration.

4. The centralizer with guide groove according to claim 2, characterized in that: The flow rate threshold is set according to the well fluid flow rate values ​​of the wells drilled in the previous years in the area where the centralizer is installed, and is specifically calculated by the following formula: ； In the above formula, Indicates the flow threshold. It indicates the maximum value of the well fluid flow rate of the wells drilled in previous years. It indicates the minimum value of the well fluid flow rate of the wells drilled in previous years. Indicates the maximum average flow rate. Indicates the minimum average flow rate. Indicates the maximum flow value that the support plate can withstand.

5. The centralizer with guide groove according to claim 4, characterized in that: , The specific method of obtaining the data is as follows: cluster analysis is performed on the well fluid flow values ​​obtained in previous years to obtain K clusters, and the K clusters are sorted from large to small according to the size of the cluster center, and the average flow value in the first N / K clusters is taken as , the average flow value of the last N / K clusters is , N represents the number of years of the obtained wellbore fluid flow values ​​for the drilled wells, and K is set to be greater than N.

6. The centralizer with guide groove according to claim 2, characterized in that: The straightener also includes a crushing assembly. A plurality of the crushing assemblies are arranged at intervals along the circumference of the lower end surface of the straightening block. Each crushing assembly includes a motor and a drill bit. The motors are embedded in the lower end surface of the straightening block. The output end of the motor is fixedly connected to the drill bit. The motor is electrically connected to the controller.

7. The centralizer with guide groove according to claim 6, characterized in that: When the second straightening assembly located below is in a non-working state, when one or more pressure sensors installed thereon detect a pressure value, the motor is started to electrically drive the drill bit to crush the well wall at the lower end of the straightening body.

8. The centralizer with guide groove according to claim 1, characterized in that: A connecting groove is provided inside each straightening block, and both ends of the connecting groove are respectively connected to the guide grooves adjacent to the straightening block where it is located. All the connecting grooves are located in the same horizontal plane. A solenoid valve is provided in each connecting groove, and the solenoid valve is electrically connected to the controller. The controller controls the opening of the solenoid valve according to the flow value detected by the flow sensor.

9. The centralizer with guide groove according to claim 6, characterized in that: The specific method of the controller controlling the opening of the solenoid valve according to the flow value detected by the flow sensor is: (1) When When , the controller controls the opening of all solenoid valves to 100%; (2) When When the controller controls the opening of all solenoid valves to %; (3) When When the controller controls the opening of all solenoid valves to %; In the above formula, n represents the total number of flow sensors set. It indicates the maximum value of the flow difference obtained by subtracting any two of the total flow values. It means the average value of the flow difference obtained by subtracting any two of the total flow values. It indicates the total number of flow difference values ​​obtained by subtracting any two of the total flow values.

10. The centralizer with guide groove according to claim 1, characterized in that: The first straightening assembly includes a spring, a support plate and a slider. The straightening block is provided with a first groove and a slide groove. One end of the spring is fixedly connected to the bottom of the first groove, and the other end of the spring is fixedly connected to the inner wall of the support plate. One end of the support plate is fixedly connected to the slider, and the slider is slidably connected to the inside of the slide groove. The other end of the support plate is fixedly connected to the outer wall of the straightening block, and the support plate is elastic.

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