Centralizer with guide groove

Abstract

The present invention relates to the technical field of centralizers, and in particular to a centralizer with a guide groove; the centralizer comprises a centralizer body, a first centralizer assembly, a second centralizer assembly and a controller; the centralizer body is provided with a plurality of centralizer blocks and guide grooves at intervals along its circumference, a guide groove is provided between two adjacent centralizer blocks, a first centralizer assembly and two second centralizer assemblies are provided on each centralizer block, and a pressure sensor is provided in the second centralizer assembly; a flow sensor is embedded in the guide groove; 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 centralizer assembly works; when the flow value detected by the flow sensor is greater than the flow threshold, the second centralizer assembly works; when the second centralizer assembly works, the controller controls the movement of the second centralizer assembly according to the flow value detected by the flow sensor and the pressure value detected by the pressure sensor; the present invention is suitable for adjustment and support of different well diameters, and improves support stability.

Description

Technical Field

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

[0002] A centralizer, also known as a stabilizer, is a tool that stabilizes downhole drilling tools and prevents deviation, and is used to stabilize the drilling direction. The centralizer is mainly used to straighten the casing, ensure the smooth operation of the slender drill pipe, and make the drill bit axis as close as possible to the centerline of the borehole. Existing centralizers are mostly divided into two types. One is a rigid centralizer, which has good supporting force but cannot change the diameter and has a smaller range of application. The other is an elastic centralizer. Although this type of centralizer can change the size of the diameter, it has poor supporting force and is prone to deviation.

[0003] Chinese patent CN105781443A discloses a variable diameter centralizer comprising: a central tube; a plurality of centralizing bars uniformly distributed circumferentially along the outer side of the central tube, the centralizing bars comprising an axial sliding section, an upper connecting section, a wellbore contact section, and a lower connecting section hingedly connected from top to bottom, the lower connecting section being hinged to the central tube; a radial elastic distance adjustment device connected between the wellbore contact section and the outer side of the central tube; and an elastic limiter sleeved on the central tube and contacting the outer sides of each axial sliding section. However, this centralizer is only applicable where the wellbore diameter is consistent, resulting in low adaptability. Furthermore, wellbore fluid typically passes through the outer wall of the centralizer, and this centralizer does not consider the impact of wellbore fluid on its supporting force.

[0004] Therefore, there is an urgent need to provide a centralizer with a guide groove, which is suitable for adjustment and support of different well diameters and improves support stability compared to the existing technology. Summary of the Invention

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

[0006] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] The centralizer with a guide groove comprises a centralizer body, a first centralizer assembly, a second centralizer assembly and a controller, the centralizer body being sleeved on the outer wall of the casing, the centralizer body being provided with a plurality of centralizer blocks and guide grooves at intervals along its circumference, the guide groove being provided between two adjacent centralizer blocks, each centralizer block being provided with one first centralizer assembly and two second centralizer assemblies, the second centralizer assembly comprising an electric push rod, a first rotating rod, a second rotating rod and a support block, the side wall of the centralizer block being provided with a second groove, the electric push rod being connected to the inner side wall of the second groove, the output end of the electric push rod being rotatably connected to one end of the first rotating rod, the other end of the first rotating rod being rotatably connected to the inner wall of the support block, one end of the second rotating rod being rotatably connected to the inner wall of the support block, the other end of the second rotating rod being rotatably connected to the inner side wall of the second groove connected to the electric push rod, and a pressure sensor being provided on the outer wall of the support block; a flow sensor being embedded in the guide groove, and the pressure sensor and the flow sensor being electrically connected to the controller;

[0008] A flow threshold is set. 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 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.

[0009] Furthermore, the flow values detected by all flow sensors at each moment are averaged to obtain the real-time flow value at that moment. Two second righting assemblies are distributed above and below the outer wall of the righting block. All the second righting assemblies arranged above the righting body are set as one group, and all the 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:

[0010] (1) When satisfied and P is 0, or, and When , the controller controls the electric push rods in the same group to accelerate according to the first acceleration;

[0011] (2) When both 、 When , the controller controls the electric push rods in the same group to perform deceleration motion according to the second acceleration;

[0012] (3) When satisfied When the controller controls the electric push rods in the same group to stop moving;

[0013] In the above formula, Indicates the real-time flow value, P indicates 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.

[0014] Furthermore, the first acceleration and the second acceleration satisfy the following relationship:

[0015] ;

[0016] In the above formula, represents the first acceleration, Represents the second acceleration.

[0017] Furthermore, the flow rate threshold is set according to the well fluid flow rate values of the wells drilled in the area where the centralizer is installed in previous years, and is specifically calculated by the following formula:

[0018] ;

[0019] In the above formula, Indicates the flow threshold, Indicates the maximum value of the well fluid flow rate of wells drilled in previous years. Indicates the minimum value of the well fluid flow rate of wells drilled in previous years. Indicates the maximum average flow rate, Indicates the minimum average flow rate, Indicates the maximum flow rate that the support plate can withstand.

[0020] Furthermore, 、 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 , take the average flow value of the N / K clusters and calculate it as , N represents the number of years of wellbore fluid flow values obtained for the drilled wells, and K is set to be greater than N.

[0021] Furthermore, the centralizer also includes a crushing assembly, and a plurality of the crushing assemblies are arranged at intervals along the circumference of the lower end surface of the centralizing block. Each of the crushing assemblies includes a motor and a drill bit. The motors are embedded in the lower end surface of the centralizing block, and the output end of the motor is fixedly connected to the drill bit. The motor is electrically connected to the controller.

[0022] Furthermore, when the second straightening assembly located below is in an inoperative state, when one or more pressure sensors installed thereon detect a pressure value, the motor is started and the drill bit is electrically driven to crush the well wall at the lower end of the straightening body.

[0023] Furthermore, each straightening block is provided with a connecting groove, and both ends of the connecting groove are respectively connected to the guide groove adjacent to the straightening block where it is located. 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.

[0024] Furthermore, the specific method of the controller controlling the opening of the solenoid valve according to the flow value detected by the flow sensor is:

[0025] (1) When When , the controller controls the opening of all solenoid valves to 100%;

[0026] (2) When When the controller controls the opening of all solenoid valves to %;

[0027] (3) When When the controller controls the opening of all solenoid valves to %;

[0028] In the above formula, n represents the total number of flow sensors installed. It represents the maximum value of the flow difference obtained by subtracting any two of the total flow values. It represents the average value of the flow difference obtained by subtracting any two of the total flow values. It represents the total number of flow differences obtained by subtracting any two of the total flow values.

[0029] 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, 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.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] (1) The present invention provides a first straightening assembly and a second straightening assembly, and the first straightening assembly or the second straightening 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 is small, the first straightening assembly is used. The first straightening assembly can well support the casing, and can avoid the waste of using the second straightening assembly at a small flow, thereby increasing the service life of the second straightening assembly; when the real-time flow value is greater than the flow threshold, that is, when the flow is large, the second straightening assembly is used. When the flow value is large, the supporting force of the first straightening assembly is insufficient, and the casing cannot be well supported. At this time, the second straightening assembly is used to ensure that the second straightening assembly is dynamically adjusted under large and complex flow conditions to ensure the supporting force for the casing; two groups of second straightening assemblies are provided, which can be applicable when different positions of the straightening body correspond to different well diameters, and can be adjusted and supported under different well diameter conditions, further improving the supporting stability of the straightening device of the present invention.

[0032] (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 diverted 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, further ensuring the stability of the second righting assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0034] Figure 2 It is a front view cross-sectional view showing the internal structure of the straightening block of the present invention.

[0035] Figure 3 It is a cross-sectional view of the present invention from a top view angle.

[0036] Description of reference numerals:

[0037] 1. Righting body; 11. Righting block; 12. Guide groove; 13. First groove; 14. Second groove; 15. Slide groove; 16. Connecting groove; 17. Solenoid valve; 2. First righting assembly; 21. Spring; 22. Support plate; 23. Slider; 3. Second righting assembly; 31. Electric push rod; 32. First rotating rod; 33. Second rotating rod; 34. Support block; 35. Pressure sensor; 4. Flow sensor; 5. Motor; 6. Drill bit; 7. Casing. DETAILED DESCRIPTION

[0038] 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 ordinary technicians in this field without making creative work are within the scope of protection of the present invention. It should be noted that the orientation or position relationship indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", etc. is based on the orientation or position relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description. It does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0039] like Figure 1 As shown, the present invention provides a centralizer with a guide groove, comprising 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 guide grooves 12 at intervals along the circumferential direction. A guide groove 12 is provided between two adjacent centralizing blocks 11, and the width of the guide 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 provided 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. The first centralizing component 2 and the second centralizing component 3 both play a supporting role. The crushing component is provided at the lower end of the centralizing body 1, and the crushing component is used to crush 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.

[0040] like Figure 1 、 Figure 2 As shown, each straightening block 11 is provided with a first straightening component 2 and two second straightening components 3, and each straightening block 11 is provided with a first groove 13 and a second groove 14. The first groove 13 and the second groove 14 provided on each straightening block 11 are arranged at intervals, and the first straightening component 2 is arranged at the position corresponding to the first groove 13, and the second straightening component 3 is arranged inside the second groove 14. Two second straightening components 3 are arranged inside each second groove 14, and the two second straightening components 3 are arranged along the axial direction of the straightening body 1. The two second straightening components 3 provided in the same second groove 14 are arranged opposite to each other; a slide groove 15 is also provided on the straightening block 11, and the slide groove 15 is arranged above the first groove 13.

[0041] The first straightening assembly 2 includes a spring 21, a support plate 22 and a slider 23. One end of the spring 21 is fixedly connected to the 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 plate 22. The support plate 22 is elastic and arc-shaped. The upper end of the inner wall of the support plate 22 is fixedly connected to the slider 23, and the slider 23 is slidably connected to the inside of the slide groove 15. The slider 23 can only move axially along the straightening block 11 relative to the slide groove 15. The slider 23 cannot move circumferentially along the straightening block 11 relative to the slide groove 15. The lower end of the support plate 22 is fixedly connected to the outer wall of the straightening block 11; when the liquid flow in the well is less than or equal to the flow threshold, the second straightening assembly 3 does not work, and only supports the casing 7 through the spring 21 and the support plate 22.

[0042] The second straightening assembly 3 includes an electric push rod 31, a first rotating rod 32, a second rotating rod 33 and a support block 34. The 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. The 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 inner wall of the support block 34 is also rotatably connected to the second rotating rod 33. The 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 alternately, 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-shaped support block 34 is arranged towards the well wall, and the concave surface of the arc-shaped support block 34 is arranged towards the first groove 13. A pressure sensor 35 is embedded in the most protruding position of the convex surface of the support block 34, and the sensing area of the pressure sensor 35 is flush with the most protruding position of the convex surface of the support block 34. When the liquid flow rate in the well exceeds the flow threshold, the controller controls the movement of the electric push rod 31 based on the well flow rate and the pressure value detected by the pressure sensor 35, thereby controlling the second centralizing assembly 3 to dynamically support and maintain the stability of the casing 7. When the second centralizing assembly 3 is not in operation, the inner wall of the support block 34 is arranged in contact with the outer wall of the centralizing block 11. The thickness of the support block 34 is the same as that of the support sheet 22. This prevents the support block 34 from contacting the wellbore wall and causing wear when the support sheet 22 is in operation.

[0043] like Figure 3As shown, each straightening block 11 is provided with an arc-shaped connecting groove 16, and the connecting grooves 16 provided in different straightening blocks 11 are located in a horizontal plane. Both ends of the connecting groove 16 are connected with the guide groove 12 adjacent to the straightening block 11, and each connecting groove 16 is provided with a solenoid valve 17, which is used to control the opening of the connecting groove 16 in which it is located; a flow sensor 4 is embedded in the inner wall of each connecting groove 16, and the flow sensors 4 provided in different connecting grooves 16 are all on the same horizontal plane, and the setting position of the flow sensor 4 is located above the connecting groove 16; the controller controls the opening of the solenoid valve 17 according to the flow value detected by the flow sensor 4.

[0044] The controller is electrically connected to all electric push rods 31, all solenoid valves 17, all pressure sensors 35, and all flow sensors 4. The upper second centralizing assemblies 3 within the first groove 13 are grouped together, while the lower second centralizing assemblies 3 are grouped together. Each group of second centralizing assemblies 3 can operate independently to accommodate different well diameters.

[0045] The flow rate threshold is set based on the well fluid flow rate values of wells drilled in previous years in the area where the centralizer is installed, and is calculated using the following formula:

[0046] ;

[0047] ;

[0048] In the above formula, Indicates the flow threshold, Indicates the maximum value of the well fluid flow rate of wells drilled in previous years. Indicates the minimum value of the well fluid flow rate of wells drilled in previous years. Indicates the maximum average flow rate, Indicates the minimum average flow rate, Indicates the maximum flow rate that the support piece 22 can withstand, represents the density of the well fluid, represents the elastic coefficient of the support sheet 22, Indicates the maximum deformation of the support piece 22.

[0049] 、 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 , take the average flow value of the N / K clusters and calculate it as , N represents the number of years of well fluid flow obtained in the drilled well. When the value of N / K is a decimal, the integer part is retained for cluster extraction, and K is set to be greater than N.

[0050] The flow values detected by all flow sensors 4 at each moment are averaged 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:

[0051] (1) When satisfied and P is 0, or, and When , the controller controls the electric push rods 31 in the same group to perform accelerated motion according to the first acceleration.

[0052] (2) When both 、 When the second acceleration is reached, the controller controls the electric push rods 31 in the same group to perform deceleration motion according to the second acceleration.

[0053] (3) When satisfied When the controller controls the electric push rods 31 in the same group to stop moving.

[0054] The first acceleration and the second acceleration satisfy the following relationship:

[0055] ;

[0056] In the above formula, represents the first acceleration, represents the second acceleration, represents the real-time flow rate 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, Indicates the first flow setting value, Indicates the maximum pressure value that the second rotating rod 33 can withstand along its length direction.

[0057] The first flow setting value is calculated according to the following formula:

[0058] .

[0059] The specific method for the controller to adjust the opening of the solenoid valve 17 according to the flow value detected by the flow sensor 4 is:

[0060] (1) When When , the controller controls the opening of all electromagnetic valves 17 to 100%.

[0061] (2) When When the controller controls the opening of all electromagnetic valves 17 to %.

[0062] (3) When When the controller controls the opening of all electromagnetic valves 17 to %.

[0063] In the above formula, n represents the total number of flow sensors 4 installed, It represents the maximum value of the flow difference obtained by subtracting any two of the total flow values. It represents the average value of the flow difference obtained by subtracting any two of the total flow values. It represents the total number of flow differences obtained by subtracting any two of the total flow values.

[0064] like Figure 2 As shown, the crushing components are arranged at intervals along the circumference of the straightening body 1, and each crushing component is arranged at the lower end surface of the straightening body 1. Each crushing component includes a motor 5 and a drill bit 6. The motor 5 is embedded in the lower end surface of the straightening body 1, and 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 surface of the straightening body 1, and the motor 5 is also electrically connected to the controller; when the second straightening component 3 located below is in a non-working state, when one or more pressure values are detected in the pressure sensors 35 installed thereon, the motor 5 is started, and the drill bit 6 is electrically driven to crush the well wall at the lower end of the straightening body 1.

[0065] The present invention is provided with a first righting component 2 and a second righting component 3, and the first righting component 2 or the second righting component 3 is applicable according 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 is small, the first righting component 2 is used. The first righting component 2 can well support the casing 7, and at the same time, it can avoid the waste of using the second righting component 3 when the flow is small, thereby increasing the service life of the second righting component 3; when the real-time flow value is greater than the flow threshold, that is, when the flow is large, the second righting component 3 is used. When the flow value is large, the supporting force of the first righting component 2 is insufficient, and the casing 7 cannot be well supported. At this time, the second righting component 3 is used to ensure that the second righting component 3 is dynamically adjusted under large and complex flow conditions to ensure the supporting force for the casing 7.

[0066] The present invention provides two sets of second centralizing components 3, which can be used when different positions of the centralizing body 1 correspond to different well diameters. They can be adjusted and supported under different well diameter conditions, further improving the support stability of the centralizer of the present invention.

[0067] The present invention also adjusts the opening of the solenoid valve 17 according to different situations through the controller. When the flow value in a certain guide groove 12 is too large, the liquid in the large-flow guide groove 12 can be conducted to other guide grooves 12 to ensure that the flow values in all directions of the righting body 1 are relatively even, thereby preventing the righting body 1 from tilting under the action of large-flow well fluid. At the same time, it can also ensure that the external force borne by the second righting component 3 in all directions is even, further ensuring the stability of the second righting component 3.

[0068] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Simple modifications or equivalent substitutions of the technical solution of the present invention by ordinary technicians in this field do not deviate 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 cam is connected to the control stand by an outer wall of the control stand, and the control stand has a plurality of control blocks and a guide groove at intervals along its circumference, and the guide groove is provided between two adjacent control blocks, and each of the control blocks is provided with one of the first and two second control blocks, and the second control block comprises an electric push rod, a first rotating rod, a second rotating rod and a support block, a side wall of the control block is provided with a second groove, 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, and the other end of the second rotating rod is rotatably connected to the inner side wall of the electric push rod connected to the second groove, 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; Setting a flow threshold, 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 operates; 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; The flow values detected by all flow sensors at each moment are averaged to obtain the real-time flow value at that moment. The two second righting assemblies are distributed above and below the outer wall of the righting block. All the second righting assemblies arranged above the righting body are set as one group, and all the 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 accelerate 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, Indicates the real-time flow value, P indicates 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.

2. The centralizer with guide groove according to claim 1, 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.

3. The centralizer with guide groove according to claim 1, characterized in that: The flow rate threshold is set based on the well fluid flow rate values of wells drilled in previous years in the area where the centralizer is installed, and is specifically calculated using the following formula: ； In the above formula, Indicates the flow threshold, Indicates the maximum value of the well fluid flow rate of wells drilled in previous years. Indicates the minimum value of the well fluid flow rate of wells drilled in previous years. Indicates the maximum average flow rate, Indicates the minimum average flow rate, Indicates the maximum flow rate that the support plate can withstand.

4. The centralizer with guide groove according to claim 3, 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 , take the average flow value of the N / K clusters and calculate it as , N represents the number of years of wellbore fluid flow values obtained for the drilled wells, and K is set to be greater than N.

5. The centralizer with guide groove according to claim 2, characterized in that: The centralizer 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 centralizing block. Each crushing assembly includes a motor and a drill bit. The motors are 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.

6. The centralizer with guide groove according to claim 5, characterized in that: When the second straightening assembly located below is in an inoperative 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.

7. 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.

8. The centralizer with guide groove according to claim 7, 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 installed. It represents the maximum value of the flow difference obtained by subtracting any two of the total flow values. It represents the average value of the flow difference obtained by subtracting any two of the total flow values. It represents the total number of flow differences obtained by subtracting any two of the total flow values.

9. The centralizer with guide groove according to claim 1, characterized in that: The first righting assembly includes a spring, a support plate and a slider. The righting 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 righting block, and the support plate is elastic.

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