Bit pressure auxiliary stabilizing propeller applied to fixed operation of extended reach well

Abstract

The invention relates to the technical field of drilling pressure of extended reach wells, in particular to a drilling pressure auxiliary stabilizing propeller applied to fixed operation of extended reach wells. A plurality of groups of auxiliary guide assemblies, abutting position limiting assemblies and protective plates are arranged on the outer side of the outer protective cylinder in an annular array mode with the circle center of the outer protective cylinder as the center; compared with the prior art, all-directional stability of the drilling tool is achieved through cooperation of all the assemblies, the main abutting plate and the auxiliary abutting plate are matched with the hydraulic push rod, the drilling tool can adapt to + / -5% borehole diameter change, the tripping frequency is reduced, supporting and moving are adjusted through the hydraulic push rod and a motor according to the hardness of a stratum, and the drilling pressure transmission efficiency is improved; the limiting guide wheel is driven by the hydraulic push rod, so that resistance can be reduced, the self-adaption to the borehole curvature is realized, and the stress concentration condition is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of drilling pressure for extended reach wells, and in particular to a drilling pressure-assisted stable thruster used for fixed operations in extended reach wells. Background Art

[0002] With the continuous deepening of oil and gas resource exploration and development, extended reach wells have become the core technology for the development of offshore and complex terrain oil and gas fields because of their advantages of covering a larger reservoir area with a single wellbore and reducing the construction of ground facilities. However, during the drilling process, extended reach wells face key problems such as difficulty in controlling the wellbore trajectory, low drilling pressure transmission efficiency, and insufficient stability of the drilling tool system.

[0003] Especially during the horizontal extension process, the friction resistance between the drill string and the well wall increases significantly, resulting in the inability to fully transmit the effective drilling pressure to the drill bit, seriously restricting the mechanical drilling speed and wellbore extension capabilities. In addition, although conventional stabilizers can suppress drill string vibration to a certain extent, they are prone to tool failure due to local stress concentration in complex formations, and lack dynamic adjustment capabilities, making it difficult to adapt to real-time changes in the wellbore trajectory.

[0004] Traditional hydraulic stabilizers mostly use a fixed guide wing structure with a limited adjustment range and cannot achieve multi-dimensional dynamic compensation. Especially in the high curvature section of the large displacement well, the drill bit is prone to "snake-like" bending, resulting in problems such as wellbore diameter expansion and drill bit wear, which seriously affects the drilling efficiency and completion quality. In addition, the existing stabilizer devices generally lack the intelligent distribution function of drilling pressure, making it difficult to maintain a constant drill bit load in soft and hard alternating formations, exacerbating the risk of fatigue damage to the drill bit.

[0005] In view of the above technical defects, a solution is now proposed. Summary of the invention

[0006] The purpose of the present invention is to provide a drilling pressure-assisted stable thruster for use in large-reach well fixed operations, so as to solve the problems mentioned in the above background technology.

[0007] To achieve the above-mentioned object, the present invention provides the following technical solution: a drilling pressure auxiliary stable thruster applied to fixed operation of extended displacement wells, comprising a bearing tube, an outer casing is fixedly mounted on the outer side of the bearing tube, and a plurality of auxiliary guide components, stop and limit displacement components and guard plates are arranged in a circular array on the outer side of the outer casing with its own circle center as the center; The auxiliary guide assembly includes two supporting frames connected to each other by reinforcing ribs, both side walls of the supporting frames are rotatably connected to multiple groups of rotating rods, a bracket rotatably connected to the end of the rotating rod is provided on the outer side of the supporting frame, and one end of the bracket is movably connected to a limited guide wheel through a bearing.

[0008] Furthermore, the auxiliary guide assembly also includes a hydraulic push rod rotatably mounted on the outside of the support frame, and one end of the hydraulic push rod away from the support frame is rotatably connected to the midpoint of the bottom of the bracket.

[0009] Furthermore, the positioning and limiting displacement assembly includes a sleeve frame fixed on both sides of the side walls of the guard plate, the interior of the sleeve frame is slidably connected with a sleeve plate, the inner wall of the sleeve frame is fixedly installed with a hydraulic push rod 2, and the output end of the hydraulic push rod 2 is fixedly connected to one end of the sleeve plate located inside the sleeve frame.

[0010] Furthermore, three points on the side wall of the sleeve plate are movably connected to transmission rods through bearings, one end of the three transmission rods are movably connected to the vertex position of the same triangular plate through bearings, and the side wall of the triangular plate is fixedly connected to a main stop plate.

[0011] Furthermore, both ends of the main stop plate are rotatably connected to auxiliary stop plates, the side wall of the main stop plate is rotatably connected to two hydraulic push rods three, and the output end of the hydraulic push rod three is rotatably connected to the side wall of the auxiliary stop plate.

[0012] Furthermore, a motor for driving one of the transmission rods to rotate is fixedly installed inside the sleeve plate, and a connecting block is fixedly connected between two corresponding rotating rods.

[0013] Furthermore, the side walls of the main abutment plate and the auxiliary abutment plate are both provided with mounting grooves, and a buffer plate is installed in the mounting grooves. The inner wall of the mounting groove and the buffer plate are fixedly connected by a compression spring group.

[0014] Furthermore, an organic casing is fixedly installed at the bottom of the bearing tube, a multi-cone drill bit is installed at the bottom of the organic casing, and the guard plate is fixedly connected to the outside of the outer casing.

[0015] The method for operating a drilling pressure-assisted stabilized thruster applied to a fixed operation of an extended reach well comprises the following steps: The thruster is connected to the drill collar assembly and lowered to the bottom of the well. The hydraulic push rod 1 extends the bracket to make the limit guide wheel touch the well wall lightly, start the multi-cone drill bit, and adjust the stroke of the hydraulic push rod 2 in real time to make the sleeve plate reciprocate slowly, thereby driving the main stop plate to periodically fit the well wall. When the well diameter becomes larger, that is, the contact pressure of the main stop plate decreases, hydraulic push rod three immediately drives the auxiliary stop plate to expand 15° to increase the supporting area. At the same time, hydraulic push rod one shortens its stroke to reduce the pressure of the limiting guide wheel on the well wall, thus avoiding the collapse of the well wall in the shale section.

[0016] Compared with the prior art, the present invention has the following beneficial effects: When the present invention is in use, the auxiliary guiding assembly and the stop and limit shift assembly cooperate to achieve all-round stability of the drilling tool in the axial, radial and circumferential directions. The main stop plate and the auxiliary stop plate cooperate with each other in the hydraulic push rod secondary structure to enable it to adaptively fit the diameter of the well wall, so that it can still maintain effective support when the well diameter changes by ±5%, avoiding frequent lifting and lowering of the drill to replace the stabilizer.

[0017] When drilling in hard formations, the present invention uses hydraulic push rod one to increase the thrust, causing the limiting guide wheel to apply a reverse supporting force to the well wall, thereby transmitting more drilling pressure to the drill bit; when drilling in soft formations, hydraulic push rod three contracts the secondary stop plate to reduce the supporting area to prevent the drill tool from sinking, and the motor drives the transmission rod to realize the periodic movement of the main stop plate, thereby effectively reducing the static friction between the drill string and the well wall and improving the drilling pressure transmission efficiency.

[0018] The hydraulic push rod drives the bracket to expand and contract radially in real time, driving the limit guide wheel to contact the well wall. The limit guide wheel adopts a highly wear-resistant tungsten carbide coating, which generates rolling friction when contacting the well wall, reducing sliding resistance. At the same time, the rotating rod is connected to the bearing frame through a ball hinge, allowing the bracket to adapt to changes in the wellbore curvature within the range of ±15°, ensuring that the guide wheel always maintains uniform contact pressure with the well wall to avoid local stress concentration. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to facilitate understanding by those skilled in the art, the present invention is further described below in conjunction with the accompanying drawings; Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the structure of the limiting guide wheel in the present invention; Figure 3 It is a schematic diagram of the main stop plate structure in the present invention; Figure 4 It is a schematic diagram of the bracket structure in the present invention; Figure 5 It is a schematic diagram of the transmission rod structure in the present invention; Figure 6 It is a schematic diagram of the structure of the triangle plate in the present invention; Figure 7 It is a schematic diagram of the structure of the bearing tube in the present invention.

[0020] Figure numerals: 1. bearing tube; 2. machine cover shell; 3. multi-tooth drill bit; 4. outer casing; 501. bearing frame; 502. rotating rod; 503. bracket; 504. limiting guide wheel; 505. hydraulic push rod one; 601. sleeve frame; 602. sleeve plate; 603. transmission rod; 604. triangle plate; 605. main stop plate; 606. auxiliary stop plate; 607. hydraulic push rod three. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Embodiment 1: Figure 1 - Figure 7 As shown, a drilling pressure-assisted stable thruster used for fixed operation in extended-reach wells comprises a bearing tube 1, a housing 2 is fixedly installed at the bottom of the bearing tube 1, a multi-cone drill bit 3 is installed at the bottom of the housing 2, a guard plate is fixedly connected to the outside of an outer casing 4, an outer casing 4 is sleeved and fixedly installed on the outside of the bearing tube 1, and multiple groups of auxiliary guide components, stop-shift components and guard plates are arranged in a circular array on the outside of the outer casing 4 with its own circle center as the center; The auxiliary guide assembly includes two supporting frames 501 connected to each other by reinforcing ribs, and both side walls of the supporting frames 501 are rotatably connected to multiple groups of rotating rods 502. A bracket 503 rotatably connected to the end of the rotating rod 502 is arranged on the outer side of the supporting frame 501, and one end of the bracket 503 is movably connected to a limiting guide wheel 504 through a bearing. The auxiliary guide assembly also includes a hydraulic push rod 505 rotatably installed on the outer side of the supporting frame 501, and one end of the hydraulic push rod 505 away from the supporting frame 501 is rotatably connected to the bottom midpoint of the bracket 503. The auxiliary guide assembly is composed of the supporting frame 501, the rotating rod 502, the bracket 503, the limiting guide wheel 504 and the hydraulic push rod 505.

[0023] When the multi-tooth drill bit 3 is drilling underground, the hydraulic push rod 505 will drive the bracket 503 to telescopically move in real time, further driving the limiting guide wheel 504 to contact the well wall. The limiting guide wheel 504 adopts a highly wear-resistant tungsten carbide coating, which generates rolling friction when contacting the well wall, reducing sliding resistance. At the same time, the rotating rod 502 is rotatably connected to the support frame 501, and allows the bracket 503 to adapt to changes in the wellbore curvature within the range of ±15°, ensuring that the limiting guide wheel 504 always maintains uniform contact pressure with the well wall to avoid local stress concentration.

[0024] Embodiment 2: The position limiting component includes a sleeve frame 601 fixed on both sides of the side wall of the guard plate, the sleeve frame 601 is slidably connected to the sleeve plate 602, the inner wall of the sleeve frame 601 is fixedly installed with a hydraulic push rod 2, the output end of the hydraulic push rod 2 is fixedly connected to one end of the sleeve plate 602 located inside the sleeve frame 601, and the three points on the side wall of the sleeve plate 602 are movably connected to the transmission rod 603 through bearings. The specific installation position of the transmission rod 603 on the side wall of the sleeve plate 602 is as follows: Figure 5As shown, one end of the three transmission rods 603 is movably connected to the vertex position of the same triangular plate 604 through a bearing.

[0025] The side wall of the triangle plate 604 is fixedly connected with the main stop plate 605, and both ends of the main stop plate 605 are rotatably connected with the auxiliary stop plate 606. The side wall of the main stop plate 605 is rotatably connected with two hydraulic push rods 3 607, and the output end of the hydraulic push rod 3 607 is rotatably connected to the side wall of the auxiliary stop plate 606. In summary, the stop and limit displacement assembly includes a sleeve frame 601, a sleeve plate 602, a transmission rod 603, a triangle plate 604, a main stop plate 605, an auxiliary stop plate 606 and a hydraulic push rod 3 607.

[0026] A motor for driving one of the transmission rods 603 to rotate is fixedly installed inside the sleeve plate 602, and a connecting block is fixedly connected between the two corresponding rotating rods 502. The side walls of the main stop plate 605 and the auxiliary stop plate 606 are both provided with mounting grooves, and a buffer plate is installed in the mounting groove. The inner wall of the mounting groove and the buffer plate are fixedly connected by a compression spring group.

[0027] During the specific setting, the hydraulic push rod 2 drives the sleeve plate 602 to slide in the sleeve frame 601, and the motor drives one of the transmission rods 603, thereby converting the axial movement of the transmission rod 603 into the planar movement of the triangular plate 604, that is, the triangular plate 604 drives the main stop plate 605 to flexibly fit the well wall under the action of the hydraulic push rod 2, and the triangular plate 604 drives the main stop plate 605 to expand along the wellbore direction, and the auxiliary stop plate 606 is finely adjusted in angle through the hydraulic push rod 3 607 to form a "petal-type" support structure. The surfaces of the main stop plate 605 and the auxiliary stop plate 606 are inlaid with elastic buffer plates, and the internal compression spring group can absorb the impact load caused by the sudden change of the formation and reduce the vibration amplitude of the drilling tool. When the wellbore shrinks or expands, the main stop plate 605 cooperates with the auxiliary stop plate 606, the hydraulic push rod 2, and the structure of the sleeve plate 602 to automatically adjust the expansion diameter to maintain the centering degree of the drilling tool ≥85%.

[0028] It needs to be explained here that a multi-tooth drill bit 3 is integrated at the bottom of the supporting tube 1, and a pressure sensor is provided inside the drill bit for real-time monitoring of the axial load and circumferential torque of the drill bit. When the present invention is drilling in a hard formation, the hydraulic push rod 1 505 increases the thrust, so that the limiting guide wheel 504 applies a reverse support force to the well wall, and transmits more drilling pressure to the drill bit; in soft formations, the hydraulic push rod 3 607 contracts the auxiliary stop plate 606, reducing the support area to avoid sinking of the drill tool, and the motor drives the transmission rod 603 to realize the periodic movement of the main stop plate 605, thereby effectively reducing the static friction between the drill string and the well wall, and improving the drilling pressure transmission efficiency.

[0029] In combination with Embodiment 1 and Embodiment 2, the working principle of the present invention is as follows: The thruster is connected to the drill collar assembly and lowered to the bottom of the well. The hydraulic push rod 1 505 extends the bracket 503, so that the limiting guide wheel 504 touches the well wall lightly, the multi-cone drill bit 3 is started, and the stroke of the hydraulic push rod 2 is adjusted in real time, so that the sleeve plate 602 performs a slow reciprocating motion, thereby driving the main stop plate 605 to periodically fit the well wall. When the well diameter becomes larger, that is, the contact pressure of the main stop plate 605 decreases, the hydraulic push rod three 607 immediately drives the auxiliary stop plate 606 to expand 15° to increase the supporting area. At the same time, the hydraulic push rod one 505 shortens the stroke, reducing the pressure of the limiting guide wheel 504 on the well wall, avoiding the collapse of the shale section well wall.

[0030] The above contents are merely examples and explanations of the structure of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

[0031] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0032] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A weight-on-bit assisted stabilization thruster for use in extended reach well stationary operations, comprising a bearing tube (1), characterized in that: An outer casing (4) is sleeved and fixedly mounted on the outer side of the bearing tube (1), and a plurality of groups of auxiliary guide components, stop and limit displacement components and guard plates are arranged in a circular array on the outer side of the outer casing (4) with its own circle center as the center; The auxiliary guide assembly comprises two supporting frames (501) connected to each other via reinforcing ribs, both side walls of the supporting frames (501) are rotatably connected to a plurality of rotating rods (502), a bracket (503) rotatably connected to the ends of the rotating rods (502) is provided on the outer side of the supporting frames (501), and one end of the bracket (503) is movably connected to a limited guide wheel (504) via a bearing.

2. The drilling pressure-assisted stable thruster for extended reach well fixed operation according to claim 1, characterized in that: The auxiliary guide assembly also includes a hydraulic push rod 1 (505) rotatably mounted on the outside of the carrier (501), and one end of the hydraulic push rod 1 (505) away from the carrier (501) is rotatably connected to the midpoint of the bottom of the bracket (503).

3. The WOB assisted stabilized thruster for extended reach well fixed operation according to claim 1, characterized in that: The positioning and limiting displacement assembly comprises a sleeve frame (601) fixed on both sides of the side walls of the guard plate, the sleeve frame (601) is slidably connected to a sleeve plate (602) inside, a hydraulic push rod 2 is fixedly installed on the inner wall of the sleeve frame (601), and the output end of the hydraulic push rod 2 is fixedly connected to one end of the sleeve plate (602) located inside the sleeve frame (601).

4. The WOB assisted stabilized thruster for extended reach well fixed operation according to claim 3, characterized in that: The three points on the side wall of the sleeve plate (602) are movably connected to the transmission rods (603) via bearings, and one end of the three transmission rods (603) is movably connected to the apex of the same triangular plate (604) via bearings. The side wall of the triangular plate (604) is fixedly connected to the main stop plate (605).

5. The drilling pressure-assisted stable thruster for extended reach well fixing operation according to claim 4 is characterized in that: Both ends of the main stop plate (605) are rotatably connected to the auxiliary stop plate (606), the side wall of the main stop plate (605) is rotatably connected to two hydraulic push rods three (607), and the output end of the hydraulic push rod three (607) is rotatably connected to the side wall of the auxiliary stop plate (606).

6. The WOB assisted stabilized thruster for extended reach well fixed operation according to claim 3, characterized in that: A motor for driving one of the transmission rods (603) to rotate is fixedly installed inside the sleeve plate (602), and a connecting block is fixedly connected between two corresponding rotating rods (502).

7. The WOB assisted stabilized thruster for extended reach well fixed operation according to claim 5, characterized in that: The side walls of the main stop plate (605) and the auxiliary stop plate (606) are both provided with mounting grooves, and buffer plates are installed in the mounting grooves. The inner wall of the mounting groove and the buffer plate are fixedly connected via a compression spring assembly.

8. The WOB assisted stabilized thruster for extended reach well fixed operation according to claim 1, characterized in that: An organic casing (2) is fixedly mounted on the bottom of the bearing tube (1), a multi-cone drill bit (3) is mounted on the bottom of the organic casing (2), and the guard plate is fixedly connected to the outside of the outer casing (4).

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