A multi-stage centralizer for a borehole trajectory

Abstract

This invention discloses a multi-stage drilling trajectory stabilizer, comprising an outer casing and an electric cylinder. An mounting cylinder is fixedly installed on the top of the outer casing, and an auxiliary stabilizing sleeve is fixedly installed inside the mounting cylinder. Two sliding grooves are formed inside the outer casing, and sliding rods are slidably installed inside each of the two sliding grooves. An extension connecting rod is threaded to the top of each sliding rod, and a connecting sleeve is fixedly installed on the top of each sliding rod. The invention employs a dual stabilizing structure with the auxiliary and main stabilizing sleeves working in tandem, guiding and constraining the drill rod during the drilling and deep hole machining stages respectively. This fundamentally ensures a straight drilling trajectory and precise hole positioning, significantly improving drilling accuracy and hole shape quality. The main stabilizing sleeve can move downwards in real time with the drilling depth, and a connector extends into the hole for auxiliary positioning, effectively solving the problems of drill rod wobbling and deflection during deep hole machining, reducing the risk of drill rod vibration and breakage, and extending the service life of the drill rod.

Description

Technical Field

[0001] This invention relates to the field of drilling technology, specifically to a multi-stage drilling trajectory stabilizer. Background Technology

[0002] In many fields such as machining, mining, geological exploration, and oil and gas drilling, drilling is a fundamental and crucial process. The accuracy of the borehole trajectory directly determines the quality of subsequent processes, the safety of equipment operation, and the overall reliability of the project. Whether it's machining high-precision mechanical parts, constructing boreholes for underground gas extraction in coal mines, or drilling for geological exploration in complex strata, stringent requirements are placed on the straightness of the borehole trajectory and the accuracy of the borehole position. Especially in deep hole machining scenarios, when the length-to-diameter ratio of the borehole exceeds 5, the problem of borehole trajectory deviation becomes increasingly prominent, becoming a core bottleneck restricting the improvement of drilling quality.

[0003] Currently, most of the straightening devices used in drilling operations are single-structure straighteners, mainly divided into two categories: orifice-guided and drill rod-following. Among them, orifice-guided straighteners can only provide simple guidance and constraint during the initial drilling stage of the drill rod, and cannot synchronously adjust the straightening position as the drilling depth increases. When the drill rod enters the deep hole stage, due to the flexibility of the drill rod itself, it is very easy to experience radial sway and trajectory deviation under the action of cutting force, radial force, and formation resistance. Moreover, this deviation will continue to amplify with the increase of drilling depth, eventually leading to hole tilting and out-of-tolerance hole diameter. At best, it requires rework; at worst, it directly causes the workpiece or the drill hole to be scrapped, significantly increasing production costs and operation time.

[0004] While existing drill pipe follow-up stabilizers can feed synchronously with the drill pipe, most are complex in structure, inconvenient to adjust, and lack a tiered stabilizer design. They cannot provide targeted stabilizer support for the different needs of the two critical stages: the initial drill pipe entry and deep hole drilling. Furthermore, some follow-up stabilizers require manual adjustment of the stabilizer position, which is cumbersome and has low adjustment accuracy, making it difficult to meet the needs of automated drilling operations. This not only increases the labor intensity of operators but also easily leads to stabilizer failure due to untimely or inadequate adjustments, further exacerbating drill pipe deviation problems. Especially when drilling in complex formations, factors such as lithological changes and bedding development can further amplify the risk of drill pipe deviation, causing the borehole to deviate from its designed trajectory, creating blind spots or construction hazards. Summary of the Invention

[0005] The purpose of this invention is to provide a multi-stage borehole trajectory stabilizer to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a multi-stage borehole trajectory stabilizer, comprising an outer casing and an electric cylinder, wherein an mounting cylinder is fixedly installed on the top of the outer casing, an auxiliary stabilizing sleeve is fixedly installed inside the mounting cylinder, two sliding grooves are formed inside the outer casing, and sliding rods are slidably installed inside both sliding grooves, an extension connecting rod is threaded to the top of the sliding rod, a connecting sleeve is fixedly installed on the top of the sliding rod, a main stabilizing sleeve is fixedly installed inside the connecting sleeve, and a connecting assembly is fixedly installed on the outer side of the output end of the electric cylinder.

[0007] Preferably, the connecting sleeve and the main straightening sleeve are both located inside the outer cover sleeve, and the inner diameter of the main straightening sleeve is the same as that of the auxiliary straightening sleeve.

[0008] Preferably, a connector is fixedly installed at the bottom of the main straightening sleeve, and the end of the connector away from the main straightening sleeve is conical.

[0009] Preferably, the outer casing has a first discharge hole symmetrically arranged inside, and the outer casing has a second discharge hole symmetrically arranged inside.

[0010] Preferably, the top of both the sliding rod and the extension connecting rod are fixedly installed with assembly threaded heads, and the bottom of the extension connecting rod is fixedly installed with a threaded ring, which is threadedly connected to the outside of the assembly threaded head.

[0011] Preferably, the connecting assembly includes a connecting plate, a connecting seat is fixedly installed on the top of the connecting plate, connecting bent rods are fixedly installed at both ends on one side of the connecting plate, and rotating connecting caps are rotatably installed on the bottom of the connecting bent rods at the end away from the connecting plate.

[0012] Preferably, the inner contour of the rotating connecting cap is adapted to the outer contour of the assembly thread head, and the rotating connecting cap is threaded to the outside of the assembly thread head. The output end of the electric cylinder is fixedly connected to the inside of the connecting seat, and a reinforcing strip is fixedly installed on the top of the connecting rod.

[0013] Preferably, a fixing seat is fixedly installed on the top outer side of the electric cylinder, and a top plate is fixedly installed on the top of the fixing seat.

[0014] Preferably, a vertical plate is fixedly installed at the bottom of the top plate, a fixing ring is fixedly installed on the outer side of the vertical plate, and a CNC display is fixedly installed on one side of the fixing ring.

[0015] Preferably, a support base is fixedly installed at the end of the upright plate away from the top plate, and a storage battery is fixedly installed on the top of the support base.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: the auxiliary straightening sleeve can initially constrain and guide the drill rod's entry posture, effectively limiting the radial swing and deviation of the drill rod, ensuring that the drill rod enters the workpiece with a correct and straight trajectory, avoiding problems such as hole tilting and hole diameter deviation caused by drilling angle deviation. As the drilling depth gradually increases, the electric cylinder can be started simultaneously, ultimately allowing the connector at the end of the main straightening sleeve to be accurately inserted into the drilled hole. After the connector enters the hole, it can form a stable fit with the hole wall, continuously supporting and straightening the middle and rear sections of the drill rod, further constraining the shaking and swaying of the drill rod during the drilling process, so that the drill rod maintains a stable and straight drilling trajectory throughout the entire process, realizing continuous and reliable guidance from entry to deep hole processing. The system employs a dual-centering structure with a secondary centering sleeve and a primary centering sleeve working in tandem. This structure provides guidance and constraint during both the drill rod entry and deep hole machining stages, ensuring a straight drilling trajectory and precise hole positioning from the source. This significantly improves drilling accuracy and hole shape quality. The primary centering sleeve can move downwards in real time with the drilling depth, and the connector extends into the hole for auxiliary positioning. This effectively solves the problems of drill rod wobbling and deflection during deep hole machining, reduces the risk of drill rod vibration and breakage, and extends the service life of the drill rod. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the three-dimensional appearance structure of the present invention.

[0018] Figure 2 This is a three-dimensional structural schematic diagram of the present invention from another perspective.

[0019] Figure 3 This is a partial three-dimensional structural diagram of the present invention.

[0020] Figure 4 This is a partial external structural diagram of the present invention.

[0021] Figure 5 This is a schematic diagram of the three-dimensional structure of the auxiliary straightening sleeve of the present invention.

[0022] In the diagram: 1. Vertical plate; 2. Fixing ring; 3. CNC display; 4. Connecting bent rod; 5. Battery; 6. Support base; 7. Discharge hole one; 8. Outer cover; 9. Threaded ring; 10. Extension connecting rod; 11. Rotating connecting cap; 12. Reinforcing strip; 13. Connecting plate; 14. Electric cylinder; 15. Fixing seat; 16. Top plate; 17. Connecting seat; 18. Discharge hole two; 19. Mounting cylinder; 20. Plug connector; 21. Assembled threaded head; 22. Sliding rod; 23. Connecting sleeve; 24. Main straightening sleeve; 25. Auxiliary straightening sleeve; 26. Sliding groove. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] Please see Figures 1-5 This invention provides a technical solution: a multi-stage borehole trajectory stabilizer, comprising an outer casing 8 and an electric cylinder 14. An mounting cylinder 19 is fixedly installed on the top of the outer casing 8, and an auxiliary stabilizing sleeve 25 is fixedly installed inside the mounting cylinder 19. Two sliding grooves 26 are formed inside the outer casing 8, and sliding rods 22 are slidably installed inside each of the two sliding grooves 26. An extension connecting rod 10 is threadedly connected to the top of each sliding rod 22. A connecting sleeve 23 is fixedly installed on the top of each sliding rod 22, and a main stabilizing sleeve 24 is fixedly installed inside the connecting sleeve 23. A connecting assembly is fixedly installed on the outer side of the output end of the electric cylinder 14. The connecting sleeve 23 and the main stabilizing sleeve 24 are both located inside the outer casing 8. The inner diameter of the main stabilizing sleeve 24 is the same as that of the auxiliary stabilizing sleeve 25. A connector 20 is fixedly installed at the bottom of the main stabilizing sleeve 24. The end of the connector 20 away from the main straightening sleeve 24 is conical. The top of the sliding rod 22 and the extension connecting rod 10 are both fixedly installed with assembly threaded heads 21. The bottom of the extension connecting rod 10 is fixedly installed with a threaded ring 9. The threaded ring 9 is threadedly connected to the outside of the assembly threaded head 21. The connecting assembly includes a connecting plate 13. The top of the connecting plate 13 is fixedly installed with a connecting seat 17. Both ends of one side of the connecting plate 13 are fixedly installed with connecting bent rods 4. The bottom of the connecting bent rod 4 away from the connecting plate 13 is rotatably installed with a rotating connecting cap 11. The inner contour of the rotating connecting cap 11 is adapted to the outer contour of the assembly threaded head 21, and the rotating connecting cap 11 is threadedly connected to the outside of the assembly threaded head 21. The output end of the electric cylinder 14 is fixedly connected to the inside of the connecting seat 17. The top of the connecting bent rod 4 is fixedly installed with a reinforcing strip 12.

[0025] The working principle of the above technical solution is as follows: Before drilling, the outer cover 8 is placed stably and fixed in the preset drilling position to ensure that the whole device is perpendicular to the surface to be processed, so as to provide a stable foundation for subsequent drilling operations. Subsequently, the drill rod is precisely inserted into the center holes of the auxiliary straightening sleeve 25 and the main straightening sleeve 24 in sequence. The two sets of straightening sleeves form a coaxial guiding structure. During formal drilling, the auxiliary straightening sleeve 25 can initially constrain and guide the drill rod's entry posture, effectively limiting the radial swing and offset of the drill rod, ensuring that the drill rod enters the workpiece with a correct and straight trajectory, avoiding problems such as hole tilting and hole diameter exceeding tolerance due to drilling angle deviation. As the drilling depth gradually increases, the electric cylinder 14 can be activated simultaneously. The output end of the electric cylinder 14 extends and pushes the connecting plate 13 to move smoothly downwards. The connecting plate 13 transmits power to the rotating connecting cap 11 through the connecting bent rod 4, causing it to move downwards. The rotating connecting cap 11 then drives the sliding rod 22 to slide downwards along the guiding direction through the extended connecting rod 10, thereby driving the main straightening sleeve 24 to move downwards synchronously, ultimately causing the main straightening sleeve... The connector 20 at the end of 24 is precisely inserted into the drilled hole. After entering the hole, the connector 20 forms a stable fit with the hole wall, continuously supporting and straightening the middle and rear sections of the drill rod. This further constrains the shaking and swaying of the drill rod during drilling, ensuring that the drill rod maintains a stable and straight drilling trajectory throughout the entire process. This achieves continuous and reliable guidance from the initial drilling to the deep hole machining. The dual straightening structure, with the auxiliary straightening sleeve 25 and the main straightening sleeve 24 working in tandem, guides and constrains the drill rod during the initial drilling stage and the deep hole machining stage, ensuring a straight drilling trajectory and accurate hole position from the source. This significantly improves drilling accuracy and hole shape quality. The main straightening sleeve 24 can move down in real time with the drilling depth, and the connector 20 extends into the hole for auxiliary positioning, effectively solving the problem of drill rod shaking and swaying during deep hole machining, reducing the risk of drill rod vibration and breakage, and extending the service life of the drill rod.

[0026] In another implementation scheme, such as Figures 1-5 As shown, the outer casing 8 has symmetrically arranged discharge holes 1-7 inside, and the outer casing 8 has symmetrically arranged discharge holes 2-18 inside.

[0027] When the drill rod is drilling under the guidance and constraint of the auxiliary straightening sleeve 25 and the main straightening sleeve 24, the generated debris will gradually accumulate around the drill rod inside the outer casing 8 as the drill rod rotates and feeds. At this time, the discharge hole 1 7 and discharge hole 2 18 can play a guiding and discharging role. During the rotation of the drill rod, it will drive the surrounding air to form a slight airflow. The airflow can form internal and external convection through discharge hole 1 7 and discharge hole 2 18, further assisting the discharge of debris and reducing the adhesion and residue of debris inside the borehole.

[0028] In another implementation scheme, such as Figures 1-5As shown, a fixed base 15 is fixedly installed on the top outer side of the electric cylinder 14, a top plate 16 is fixedly installed on the top of the fixed base 15, a vertical plate 1 is fixedly installed on the bottom of the top plate 16, a fixed ring 2 is fixedly installed on the outer side of the vertical plate 1, a CNC display 3 is fixedly installed on one side of the fixed ring 2, a support base 6 is fixedly installed on the end of the vertical plate 1 away from the top plate 16, and a storage battery 5 is fixedly installed on the top of the support base 6.

[0029] The CNC display 3 serves as the core of operation and control. Operators can intuitively and accurately control the start and stop of the electric cylinder 14 through the buttons or touch interface on its panel. At the same time, they can also observe the operating status, extension stroke, and other parameters of the electric cylinder 14 in real time, which is convenient for flexible adjustment according to drilling depth and straightening requirements. The operation is convenient and the control precision is high. The battery 5 provides stable and continuous power support for the electric cylinder 14, which can effectively avoid the problems of complicated external power wiring and restrictions on the working environment. It ensures that the electric cylinder 14 can still start and run normally in the field or temporary working scenarios without external power, thereby ensuring that the downward adjustment function of the main straightening sleeve 24 is not affected, and realizing the continuity and reliability of the straightening operation.

[0030] Working principle: Before drilling, the outer cover 8 is placed stably and fixed at the preset drilling position to ensure that the whole device is perpendicular to the surface to be processed, providing a stable foundation for subsequent drilling operations.Subsequently, the drill rod is precisely inserted into the center holes of the auxiliary straightening sleeve 25 and the main straightening sleeve 24 in sequence. The two sets of straightening sleeves form a coaxial guiding structure. During formal drilling, the auxiliary straightening sleeve 25 can initially constrain and guide the drill rod's entry posture, effectively limiting the radial swing and offset of the drill rod, ensuring that the drill rod enters the workpiece with a correct and straight trajectory, avoiding problems such as hole tilting and hole diameter exceeding tolerance due to drilling angle deviation. As the drilling depth gradually increases, the electric cylinder 14 can be activated simultaneously. The output end of the electric cylinder 14 extends and pushes the connecting plate 13 downwards smoothly. The connecting plate 13 transmits power to the rotating connecting cap 11 through the connecting bent rod 4, causing it to move downwards accordingly. The rotating connecting cap 11 then moves downwards through the extended connecting rod... 10. The drive sliding rod 22 slides downward along the guide direction, thereby driving the main straightening sleeve 24 to move downward synchronously. This ultimately allows the connector 20 at the end of the main straightening sleeve 24 to be precisely inserted into the drilled hole. After entering the hole, the connector 20 forms a stable fit with the hole wall, continuously supporting and straightening the middle and rear sections of the drill rod. This further constrains the swaying and deviation of the drill rod during drilling, ensuring a stable and straight drilling trajectory throughout the entire process. This achieves continuous and reliable guidance from entry into the hole to deep hole machining. The dual straightening structure, with the auxiliary straightening sleeve 25 and the main straightening sleeve 24 working in tandem, provides guidance and constraint for both the entry into the hole and the deep hole machining stages, ensuring a straight drilling trajectory and precise hole positioning from the source, significantly improving… To improve drilling accuracy and hole shape quality, the main straightening sleeve 24 can move downwards in real time with the drilling depth, and the connector 20 extends into the hole for auxiliary positioning. This effectively solves the problems of drill rod wobbling and deflection during deep hole machining, reduces the risk of drill rod vibration and breakage, and extends the service life of the drill rod. When the drill rod is drilled under the guidance and constraint of the auxiliary straightening sleeve 25 and the main straightening sleeve 24, the generated debris will gradually accumulate around the drill rod inside the outer sleeve 8 as the drill rod rotates and feeds. At this time, the discharge hole 1 7 and discharge hole 2 18 can play a guiding and discharge role. During the rotation of the drill rod, it will drive the surrounding air to form a slight airflow. The airflow can form internal and external convection through discharge hole 1 7 and discharge hole 2 18, further assisting the discharge of debris and reducing the debris accumulation. The CNC display 3 serves as the core of operation control, allowing operators to intuitively and precisely control the start and stop of the electric cylinder 14 via buttons or a touch interface on its panel. Simultaneously, operators can observe the operating status and extension / retraction stroke of the electric cylinder 14 in real time, facilitating flexible adjustments based on drilling depth and straightening requirements. The operation is convenient and the control precision is high. The battery 5 provides stable and continuous power support to the electric cylinder 14, effectively avoiding the problems of cumbersome external power wiring and limitations imposed by the working environment. This ensures that the electric cylinder 14 can still start and operate normally in field or temporary work scenarios without external power, thereby ensuring that the downward adjustment function of the main straightening sleeve 24 is not affected, achieving continuity and reliability in the straightening operation.

[0031] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multi-stage drilling trajectory stabilizer, comprising an outer casing (8) and an electric cylinder (14), characterized in that: An installation cylinder (19) is fixedly installed on the top of the outer cover cylinder (8). An auxiliary straightening sleeve (25) is fixedly installed inside the installation cylinder (19). Two sliding grooves (26) are opened inside the outer cover cylinder (8). A sliding rod (22) is slidably installed inside each of the two sliding grooves (26). An extension connecting rod (10) is threaded to the top of the sliding rod (22). A connecting sleeve (23) is fixedly installed on the top of the sliding rod (22). A main straightening sleeve (24) is fixedly installed inside the connecting sleeve (23). A connecting assembly is fixedly installed on the outer side of the output end of the electric cylinder (14).

2. The multi-stage borehole trajectory stabilizer according to claim 1, characterized in that: The connecting sleeve (23) and the main straightening sleeve (24) are both located inside the outer cover sleeve (8). The inner diameter of the main straightening sleeve (24) is the same as that of the auxiliary straightening sleeve (25).

3. The multi-stage borehole trajectory stabilizer according to claim 2, characterized in that: A connector (20) is fixedly installed at the bottom of the main straightening sleeve (24), and the end of the connector (20) away from the main straightening sleeve (24) is conical.

4. A multi-stage borehole trajectory stabilizer according to claim 3, characterized in that: The outer cover (8) has a symmetrically arranged discharge hole 1 (7) inside, and the outer cover (8) has a symmetrically arranged discharge hole 2 (18) inside.

5. A multi-stage borehole trajectory stabilizer according to claim 4, characterized in that: The top of both the sliding rod (22) and the extension connecting rod (10) are fixedly installed with assembly threaded heads (21), and the bottom of the extension connecting rod (10) is fixedly installed with a threaded ring (9), which is threadedly connected to the outside of the assembly threaded head (21).

6. A multi-stage borehole trajectory stabilizer according to claim 5, characterized in that: The connecting assembly includes a connecting plate (13), a connecting seat (17) is fixedly installed on the top of the connecting plate (13), and connecting bent rods (4) are fixedly installed at both ends on one side of the connecting plate (13). Rotating connecting caps (11) are rotatably installed at the bottom of the connecting bent rods (4) away from the connecting plate (13).

7. A multi-stage borehole trajectory stabilizer according to claim 6, characterized in that: The inner contour of the rotating connecting cap (11) is compatible with the outer contour of the assembly thread head (21), and the rotating connecting cap (11) is threaded to the outside of the assembly thread head (21). The output end of the electric cylinder (14) is fixedly connected to the inside of the connecting seat (17), and a reinforcing strip (12) is fixedly installed on the top of the connecting bent rod (4).

8. A multi-stage borehole trajectory stabilizer according to claim 7, characterized in that: A fixed seat (15) is fixedly installed on the top outer side of the electric cylinder (14), and a top plate (16) is fixedly installed on the top of the fixed seat (15).

9. A multi-stage borehole trajectory stabilizer according to claim 8, characterized in that: A vertical plate (1) is fixedly installed at the bottom of the top plate (16), a fixing ring (2) is fixedly installed on the outside of the vertical plate (1), and a CNC display (3) is fixedly installed on one side of the fixing ring (2).

10. A multi-stage borehole trajectory stabilizer according to claim 9, characterized in that: A support base (6) is fixedly installed at one end of the upright plate (1) away from the top plate (16), and a storage battery (5) is fixedly installed on the top of the support base (6).

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