A guide sub for a rotary guide drilling tool

Abstract

The present invention belongs to the technical field of oil extraction, and specifically is a guide pup joint of a rotary guide drilling tool, comprising a drill rod, a rotary guide drilling tool body, a drill bit, a measurement and control module and a guide pup joint; the drill rod is connected to the rotary guide drilling tool body, a steering motor is installed in the rotary guide pup joint, the steering motor rotor is connected to a turntable, the other end of the turntable is connected to the guide pup joint core shaft by a ball hinge, the guide pup joint housing is connected to the rotary guide drilling tool body housing, the other end of the guide pup joint core shaft is connected to the drill bit, the structure is reasonable, the movement of the drive shaft and the rotary guide control motor can be coupled, the structure is simple, and the promotion value is extremely high.

Description

Technical Field

[0001] The invention relates to the technical field of oil production, in particular to a guide short section of a rotary guide drilling tool. Background Art

[0002] In the directional drilling operation of the oil production process, in order to control the drilling direction of the drill bit, according to the wellbore trajectory design plan, it is necessary to carry out directional drilling operations such as increasing inclination, decreasing inclination, and twisting azimuth during construction. Usually, MWD and drilling motor are used to complete directional drilling operations. During the directional drilling operation, the entire drill bit cannot rotate, and the transmission mechanism and the well wall are mostly static friction, which causes the drill bit to often be depressurized, seriously affecting the drilling speed and increasing the drilling cost. In more serious cases, it will cause the drill to get stuck, the entire drill bit cannot be removed, the wellbore is scrapped, and the economic loss is serious.

[0003] In this context, the rotary steerable drilling system came into being. It mainly includes a drilling rig installed on the oil well and a rotary steerable drilling tool installed below for drilling. The drilling rig is connected to the drill shaft on the rotary steerable drilling tool through a flexible drive shaft, thereby transmitting torque to the drill shaft, and the drill shaft drives the drill bit to drill. The rotary steerable tool controls the movement direction of the drill bit during the drilling process.

[0004] Technicians in the field of rotary steerable drilling have designed a variety of mechanical structures and control schemes to enable the drill bit to achieve the required motion trajectory. Among them, there are three typical methods, namely push-type rotary steerable tools, pointing rotary steerable tools, and composite rotary steerable tools. The present invention provides a mechanical structure of a guide short section under the constant speed reverse control mode of a pointing rotary steerable drilling tool motor, which can couple the movement of the drive shaft and the rotary steerable control motor to solve the problems raised in the above background technology. Summary of the invention

[0005] The purpose of this section is to summarize some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0006] Therefore, the purpose of the present invention is to provide a guide short section of a rotary guide drilling tool, which can couple the movement of a drive shaft and a rotary guide control motor, has a simple structure and has a very high promotion value.

[0007] To solve the above technical problems, according to one aspect of the present invention, the present invention provides the following technical solutions:

[0008] A guide sub for a rotary guide drilling tool, comprising a drill rod, a rotary guide drilling tool body, a drill bit, a measurement and control module and a guide sub;

[0009] The drill rod is connected to the rotary steering drill body, a steering motor is installed in the rotary steering short section, the steering motor rotor is connected to the turntable, the other end of the turntable is connected to the guide short section mandrel by a ball hinge, the guide short section housing is connected to the rotary steering drill body housing, and the other end of the guide short section mandrel is connected to the drill bit;

[0010] The measurement and control module includes a rotation speed sensor for detecting the rotation speed of the rotary steerable drilling tool body and a controller for controlling the rotation speed of the steering motor, and the rotation speed sensor is electrically connected to the controller;

[0011] Among them, there is a fixing bolt hole inside the guide short section shell to fix the steering motor inside; the guide short section shell is circumferentially arranged with a plurality of grooves for installing guide rails, and there is a slider on the guide rail, the slider is connected to the connecting plate by a hinge, and the connecting plate is connected to the guide short section core shaft by a hinge.

[0012] As a preferred solution of the guide pup joint of the rotary guide drilling tool described in the present invention, the hinge between the connecting plate and the core shaft of the guide pup joint has sufficient movement space.

[0013] As a preferred solution of the guide pup joint of the rotary guide drilling tool described in the present invention, the guide pup joint outer sleeve, steering motor stator, steering motor rotor, turntable, guide pup joint core shaft, slider, guide rail and connecting plate are made of high-strength alloy steel.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The rotary guide drilling tool guide sub of the present invention has reasonable design, simple structure and extremely high promotion value.

[0016] 2. When the rotary steerable drill tool rotates and drills, the drill rod rotates clockwise, the rotary steerable drill tool body detects its own speed through the speed sensor, and the control module controls the steering motor to rotate counterclockwise at a speed lower than the drill rod. At this time, the guide short section of the present invention transmits this composite motion to the drill bit, and at this time there is an angle between the center line of the drill bit and the center line of the rotary steerable drill tool, and the drill bit rotates clockwise around its own central axis (rotation), and at the same time rotates clockwise around the central axis of the rotary steerable drill tool (revolution), thereby completing rotary drilling.

[0017] 3. When the rotary steerable drill tool is guiding drilling, the drill rod rotates clockwise, the rotary steerable drill tool body detects its own speed through the speed sensor, and the control module controls the steering motor to rotate counterclockwise at the same speed. At this time, the guide short section of the present invention transmits this composite operation to the drill bit. At this time, there is an angle between the center line of the drill bit and the center line of the rotary steerable drill tool. The drill bit rotates clockwise (rotates) around its own central axis, and the central axis of the drill bit is fixed relative to the ground, thereby completing the guided drilling.

[0018] 4. Through the use of the rotary steerable drilling tool guide short section in the well, the drilling pressure and torque of the drill collar or drill pipe can be transmitted to the drill bit regardless of the rotary drilling state or the directional drilling state, which speeds up the rotation speed, reduces the drilling cost and reduces the rate of drill sticking. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the present invention will be described in detail below in combination with the accompanying drawings and detailed embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0020] Figure 1 It is a schematic diagram of the installation structure described in an implementation example of the present invention.

[0021] Figure 2 It is a schematic diagram of the structure of a universal device described in an implementation example of the present invention.

[0022] Figure 3 Schematic diagram of the assembly of the universal device slider and the connecting plate in an embodiment of the present invention

[0023] Figure 4 This is a schematic diagram of the movement described in an implementation example of the present invention.

[0024] In the figure; 1-drill rod; 2-rotating guide drilling tool body; 3-drill bit; 4-measurement and control module; 5-guide short section; 51-guide short section outer sleeve; 52-stator of steering motor; 53-rotor of steering motor; 54-turntable; 55-guide short section mandrel; 56-slider; 57-guide rail; 58-connecting plate. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0026] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0027] Secondly, the present invention is described in detail with reference to schematic diagrams. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0028] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0029] The present invention provides the following technical solution: a guide sub for a rotary guide drilling tool, comprising a drill rod 1, a rotary guide drilling tool body 2, a drill bit 3, a measurement and control module 4 and a guide sub 5;

[0030] The drill rod 1 is connected to the rotary steering drill body 2, the rotary steering short section 5 is equipped with a steering motor 52, the steering motor rotor 53 is connected to the turntable 54, the other end of the turntable 54 is connected to the guide short section mandrel 55 by a ball hinge, the guide short section housing 51 is connected to the housing of the rotary steering drill body 2, and the other end of the guide short section mandrel 55 is connected to the drill bit 3;

[0031] The measurement and control module 4 includes a rotation speed sensor for detecting the rotation speed of the rotary guide drilling tool body 2 and a controller for controlling the rotation speed of the steering motor 53, and the rotation speed sensor is electrically connected to the controller;

[0032] Among them, there is a fixing bolt hole inside the guide short section housing 51 to fix the steering motor 52 inside; the guide short section housing 51 is circumferentially provided with a plurality of grooves for mounting guide rails 57, and there is a slider 56 on the guide rail 57, the slider 56 is connected to the connecting plate 58 by a hinge, and the connecting plate 58 is connected to the guide short section core shaft 55 by a hinge.

[0033] Specifically, the hinge between the connecting plate 58 and the guide short section mandrel 55 has sufficient movement space.

[0034] Specifically, the guide short section outer sleeve 51, the steering motor stator 52, the steering motor rotor 53, the turntable 54, the guide short section core shaft 55, the slider 56, the guide rail 57 and the connecting plate 58 are made of high-strength alloy steel.

[0035] Working principle: The motion state of the drill tool when observed from the ground. O1 is the rotation axis of the drill collar, and O2 is the rotation axis of the drill bit. ω1 represents the rotation angular velocity of the drill collar, ω3 represents the rotation angular velocity of the drill bit, and ω2 represents the angular velocity of the drill bit rotation axis O2 orbiting around O1.

[0036] When the rotary steerable drill tool rotates and drills, the drill rod 1 rotates clockwise, driving the rotary steerable drill tool body 2 to rotate, the guide short section 5, and the drill bit 3 to rotate along with the rotary steerable drill tool body 2. The rotary steerable drill tool body 2 detects its own speed ω1 through the speed sensor, and the control module 4 controls the steering motor to rotate counterclockwise at a speed lower than the drill rod 1 (ω motor < ω1). At this time, the drill bit 3 is in a state of compound motion, that is, the drill bit 3 rotates clockwise around its own central axis (ω1=ω3), and at the same time rotates clockwise around the central axis of the rotary steerable drill tool 2 (0<ω2=ω1-ω motor).

[0037] When the rotary steerable drilling tool is guiding drilling, the drill rod 1 rotates clockwise, driving the rotary steerable drilling tool body 2 to rotate, and the guide short section 5 and the drill bit 3 rotate together with the rotary steerable drilling tool body 2. The rotary steerable drilling tool body 2 detects its own speed ω1 through the speed sensor, and the control module 4 controls the steering motor 5 to rotate counterclockwise at a speed equal to the speed of the drill rod 1 (ω motor = ω1). At this time, the drill bit 3 is in a state of motion, that is, the drill bit 3 rotates clockwise around its own central axis (ω1 = ω3), and is relatively stationary with the central axis of the drilling tool (ω2 = 0).

[0038] By using the rotary steering drill bit guide sub in the well, the self-rotation torque of the drill bit 3 is provided by the drill pipe 1. The drilling direction of the drill bit 3 is controlled by the steering motor. This method speeds up the drilling speed, reduces the drilling cost, and reduces the rate of drill bit sticking.

[0039] Although the present invention has been described above with reference to the embodiments, various modifications may be made thereto and parts thereof may be replaced by equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the various features in the embodiments disclosed in the present invention may be used in combination with each other in any manner, and the fact that these combinations are not exhaustively described in this specification is only for the sake of omitting space and saving resources. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A guide sub for a rotary guide drilling tool, characterized in that: It comprises a drill rod (1), a rotary guide drilling tool body (2), a drill bit (3), a measurement and control module (4) and a guide short section (5); The drill rod (1) is connected to a rotary guide drilling tool body (2); a steering motor stator (52) and a steering motor rotor (53) are installed in the steering short section (5); the steering motor rotor (53) is connected to a turntable (54); the other end of the turntable (54) is connected to a steering short section mandrel (55) by a ball hinge; the steering short section housing (51) is connected to the housing of the rotary guide drilling tool body (2); the other end of the steering short section mandrel (55) is connected to a drill bit (3); The measuring and controlling module (4) comprises a speed sensor for detecting the speed of the rotary steering drilling tool body (2) and a controller for controlling the rotation speed of the steering motor rotor (53), and the speed sensor is electrically connected to the controller; wherein the guide short section housing (51) has a fixing bolt hole inside, and the steering motor stator (52) is fixed inside; the guide short section housing (51) is circumferentially provided with a plurality of grooves for mounting guide rails (57), the guide rails (57) are provided with sliders (56), the sliders (56) are connected to the connecting plate (58) by a hinge, the connecting plate (58) is connected to the guide short section mandrel (55) by a hinge, the hinge between the connecting plate (58) and the guide short section mandrel (55) has sufficient movement space, and the guide short section housing (51), the steering motor stator (52), the steering motor rotor (53), the turntable (54), the guide short section mandrel (55), the sliders (56), the guide rails (57) and the connecting plate (58) are made of high-strength alloy steel.

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