CN213953512U - Full-rotation directional guide tool - Google Patents
Full-rotation directional guide tool Download PDFInfo
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- CN213953512U CN213953512U CN202022782731.XU CN202022782731U CN213953512U CN 213953512 U CN213953512 U CN 213953512U CN 202022782731 U CN202022782731 U CN 202022782731U CN 213953512 U CN213953512 U CN 213953512U
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Abstract
The utility model relates to a drilling tool belongs to probing technical field, specifically relates to a directional formula of full rotation direction instrument. The method comprises the following steps: the inner cavity of the drill collar is connected with a spherical hinge through a spherical bearing, and a plurality of torque transmission cylinders are arranged between the spherical hinge and the inner wall of the drill collar; and the guide mandrel penetrates through the spherical hinge and is fixedly connected with the spherical hinge, the lower end of the guide mandrel is connected with the drill bit, and the upper end of the guide mandrel is connected with the eccentric shaft through the ball bearing set. The tool provides a new guiding tool design, which not only can meet the requirement of fine control of a well track, but also can obviously improve the guiding capability of a rotary guiding tool.
Description
Technical Field
The utility model relates to a drilling tool belongs to probing technical field, specifically relates to a directional formula of full rotation direction instrument.
Background
In the prior art, the rotary steering tool realizes the steering control of the well track under the rotation state of a drill column, overcomes the defects of overlarge friction, small rock debris deposition, small ultimate displacement and the like in sliding steering operation, and can greatly improve the well quality, the drilling efficiency and the drilling safety, so the rotary steering tool is widely applied to the steering construction operation of extended reach wells, horizontal wells and wells with three-dimensional complex structures, and is one of typical advanced drilling equipment at present. The rotary steering tool is divided into two basic types of a drill bit pushing type and a drill bit pointing type according to a steering mode, and can be divided into a driving shaft-non-rotating sleeve structure, a full-rotation structure and the like according to a power transmission structure mode. The full-rotation directional steering tool combines the advantages of directional steering and full-rotation drilling, can be more suitable for various complex stratums and operation conditions, can drill deeper and at a higher drilling speed, and has higher competitiveness in the development of marine oil and gas resources and the drilling of special process wells such as ultra-deep wells, high-difficulty directional wells, cluster wells, horizontal wells, extended reach wells, branch wells, three-dimensional complex structure wells and the like in complex oil and gas reservoirs in oil field development.
The main technical feature of the full-rotation directional steering tool in the prior art is that a fixed steering offset structure is adopted, the build-up rate of the tool is realized by a steering and steady-slope drilling mode which is changed alternately, and the tool is controlled by depending on the conduction direction parameters (tool surface and steering proportion) under a ground system. The defects are that the deflecting capability of the tool is low, the highest theoretical deflecting rate is 8 degrees/30 m, and the application range of the tool is limited to a certain extent.
Therefore, the structure of the full-rotation guiding tool in the prior art is optimized, the guiding capability of the rotation guiding tool is improved, the field application requirements are better met, and the technical problem which needs to be solved urgently at present is solved.
SUMMERY OF THE UTILITY MODEL
The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.
The utility model discloses main purpose is to solve foretell technical problem that exists among the prior art, provides a directional formula of full rotation direction instrument. The tool not only can meet the requirement of fine control of the well track, but also can obviously improve the guiding capability of the rotary guiding tool.
In order to solve the above problem, the utility model discloses a scheme is:
a full rotation directional steering tool comprising:
the inner cavity of the drill collar is connected with a spherical hinge through a spherical bearing, and a plurality of torque transmission cylinders are arranged between the spherical hinge and the inner wall of the drill collar;
the guide mandrel penetrates through the spherical hinge and is fixedly connected with the spherical hinge, the lower end of the guide mandrel is connected with the drill bit, and the upper end of the guide mandrel is connected with the eccentric shaft through the ball bearing set;
the guide mandrel rotates under the drive of the drill collar, and the eccentric shaft rotates under the drive of a motor arranged in the drill collar.
Preferably, the above-mentioned full-rotation directional guide tool includes: the center of the spherical hinge is positioned on the axis of the drill collar, and under the radial pushing of the eccentric shaft, the guide mandrel deflects by taking the center of the spherical hinge as a fulcrum, and the axis of the guide mandrel and the axis of the drill collar form a fixed deflection angle, so that the direction of a guide tool is formed;
the maximum eccentricity of the eccentric shaft is determined by different positions of the 360-degree range of the circumference, so that different directions of the guide mandrel are determined.
Preferably, in the fully-rotating directional steering tool, the outer wall of the drill collar is provided with a plurality of stabilizing strips to form a near-bit stabilizer.
Preferably, in the above-mentioned full-rotation directional guide tool, the lower end of the eccentric shaft and the upper end of the guide mandrel are of an insertion structure, and the ball bearing set is arranged between the eccentric shaft and the guide mandrel.
Preferably, in the above full-rotation directional guide tool, a multi-core connection cylinder, a motor, a rotary transformer, a speed reducer, and a speed reducer output shaft are sequentially arranged in the drill collar, and the eccentric shaft is connected to the speed reducer output shaft.
Preferably, in the above-mentioned full-rotation directional guide tool, the reducer output shaft is sleeved in an L-shaped reducer output shaft housing, and an oil storage cavity is provided between the reducer output shaft housing and the drill collar; a floating sealing plug is arranged between the reducer output shaft shell and the drill collar and is connected to one L-shaped side of the reducer output shaft shell through a compression spring; the upper end of a flexible long and thin drilling fluid isolation tube is sealed with the inner cavity of the multi-core wiring terminal body, and the lower end of the flexible long and thin drilling fluid isolation tube penetrates through the guide mandrel and then is blocked by a drilling fluid isolation tube sealing head arranged in the inner wall of the guide mandrel; lubricating oil is filled between the drilling fluid isolation pipe and the drill collar.
Preferably, in the above full-rotation directional guide tool, a through hole is formed in the drill collar between the floating sealing plug and the L-shaped side of the reducer output shaft housing.
Therefore, the utility model has the advantages that: the utility model provides a full rotatory directional steering tool not only can satisfy the needs of the meticulous control of well track, can show moreover and improve rotatory steering tool's guide ability (the build-up rate is greater than 15/30 m), realizes "one trip" drilling operation (straight well section, build inclined shaft section and horizontal well section creeps into in succession).
Drawings
The accompanying drawings, which are incorporated herein and form a part of the specification, illustrate embodiments of the present invention and, together with the description, further serve to explain the principles of the invention and to enable a person skilled in the pertinent art to make and use the disclosure.
Fig. 1 illustrates an overall structure of a high build rate full rotation directional steering tool in an embodiment of the present invention;
fig. 2 illustrates a schematic structural diagram of an extended docking and power supply assembly in an embodiment of the present invention;
fig. 3 illustrates a schematic view of a measurement and control assembly in an embodiment of the invention;
fig. 4 illustrates a schematic structural view of a guide actuating assembly in an embodiment of the present invention;
5-6 illustrate partial schematic views of a guidance actuation assembly structure in an embodiment of the present invention;
fig. 7 illustrates a cross-sectional view of a ball joint location of a guide actuator assembly structure in an embodiment of the invention;
fig. 8 illustrates a tool build rate three-point circle method in an embodiment of the present invention;
fig. 9 illustrates a schematic diagram of the effect of moving the lower stabilizer position on the tool build rate in an embodiment of the invention;
fig. 10 illustrates a schematic diagram of the influence of the position of the curved point of the moving structure on the tool build rate in an embodiment of the present invention;
FIG. 11 illustrates a schematic diagram of the effect of moving the upper stabilizer position on the tool build rate in an embodiment of the invention;
fig. 12 illustrates a schematic diagram of the effect of varying the outer diameter of the lower stabilizer on the tool build rate in an embodiment of the invention;
embodiments of the present invention will be described below with reference to the accompanying drawings.
Detailed Description
Examples
Fig. 1 is a schematic structural diagram of the guiding tool according to this embodiment. From the perspective of reducing the machining degree of difficulty, improving instrument assembly rationality, being convenient for debugging and maintenance etc, divided into 3 assemblies with the instrument, extension butt joint promptly and power supply assembly, measurement and control assembly, direction execution assembly. The expansion butt joint and power supply assembly mainly comprises a butt joint and expansion unit 1 and a power supply unit 2, the measurement and control assembly mainly comprises a measurement control unit 3, and the guide execution assembly mainly comprises a guide execution unit 4.
Wherein: the electric communication between the extension butt joint and power supply assembly and the measurement and control assembly is directly butt joint communicated with the electric communication multi-core butt joint structure 301 through the electric communication butt joint structure 204. Electrical communication between the measurement and control assembly, the steering actuation assembly is achieved through a wire connection between the electrical communication wiring window 304 and the multi-conductor wiring column 401.
As a preferred mode, the power supply and communication lines of the guide assembly are led out through a multi-core high-pressure sealing connector arranged in a plurality of sealing holes 419, pass through a plurality of wire through holes 417, and are wound in the wire embedding groove 416, and in order to prevent the rotation of the multi-core wiring column 401 from damaging the connecting cables, a rotation preventing key 418 is arranged;
as a preferred mode, in this embodiment, after the measurement and control assembly and the guidance execution assembly are mechanically connected, the cable pre-embedded in the embedded slot 416 is drawn out through the radial hole in the wiring window 304 to communicate with the cable of the measurement and control assembly. To prevent drilling fluid from entering the interior of the wiring window 304, a plurality of sealing rings 415 are provided at the end of the multiconductor wiring column 401.
As shown in fig. 2, what is the present embodiment is a docking and expansion unit 1 and a power supply unit 2.
The docking and expansion unit 1 consists of a short drill collar 101 and an expandable electrical communication docking structure 102. See fig. 2. The functions are as follows: the short drill collar 101 enables a mechanical connection between a tool or instrument located in its upper part and the power supply unit 2 located in its lower part. The electric communication butt joint structure 102 is in butt joint with an electric communication structure of a measurement unit of the engineering while drilling/geological parameters on the upper part of the tool, and if a synergistic mud motor with a power supply and signal simultaneous transmission function is arranged on the upper part of the tool, the electric communication butt joint structure 102 is in butt joint with the electric communication structure of the synergistic mud motor.
As shown in fig. 2, the power supply unit 2 is mainly composed of a turbine generator 201, a battery pack 202, a power supply control circuit 203, an electrically connected pair structure 204, and the like. The function of this is to supply power to the guidance means, in particular to the measurement and control circuitry, measurement sensors, etc. of the measurement control unit 3 and to the motor, etc. of the guidance execution unit 4.
As shown in fig. 3, is a measurement control unit 3 of the present embodiment. The measurement control unit 3 is mainly composed of an electrically-connected multi-core docking structure 301, a tool setting detection and data reading port 302, measurement and control circuitry 303, an interchangeable upper stabilizer 304, an electrically-connected wiring window 305, and the like. The system has the functions of measuring well track parameters (a well inclination angle, an azimuth angle and a tool face angle), motion state parameters (tool rotating speed, a dynamic tool face position, ground pump opening/closing, axial motion distance and the like) and working condition environment parameters (column internal/annular pressure, vibration, temperature and the like), and is responsible for underground main control, demodulation and downloading instructions, acquisition of sensor reading, data storage and communication, measurement data and control calculation, driving and guiding control and the like.
As shown in fig. 4 to 7, the guiding performing unit 4 of the present embodiment is shown. The guiding execution unit 4 mainly comprises a multi-core connection cylinder 401, a motor 402, a rotary transformer 403, a reducer 404, a reducer output shaft 405, a guiding offset mechanism (an eccentric shaft 406 and a plurality of groups of supporting bearings), a guiding mandrel mechanism (a spherical bearing group 407, a guiding mandrel 408, a spherical bearing 409, a spherical hinge 410 and a spherical bearing 412), a plurality of torque transmission cylinders 411, a drill collar 413 and the like, wherein the lower end of the guiding mandrel is directly connected with a drill bit. The drill collar 413 transmits rotational power to the steering spindle 408 through a plurality of torque-transmitting cylinders 411, which drives the drill bit to rotate and drill. When the guiding drilling is carried out, the guiding mandrel is controlled to point to a certain position within the 360-degree range of the well periphery and is kept unchanged, the pointing direction of the guiding mandrel is relatively static to the ground, the guiding mandrel still rotates around the axis of the guiding mandrel at the moment, and the drill bit is driven to drill according to the direction; and if the drilling direction needs to be adjusted, the guide mandrel is controlled to point to another direction, and the drill bit is driven to drill according to the other direction. When the guiding drilling is not needed, the guiding mandrel is controlled to form a steady-slope drilling mode, and if the guiding mandrel is controlled to drill along the circumference of a well at the same angle change direction and for short time duration, the drilling is equivalent to the guiding drilling with the uniform change direction and the same short time interval.
The guiding principle of the present embodiment will be described with reference to fig. 4 to 7. The guide mandrel 408 is radially pushed by the eccentric shaft 406 through the bearing 407, and deflects by taking the spherical center of the spherical hinge 410 as a fulcrum, and forms a deflection angle with the axial line of the drill collar 413, and the direction of the axial line of the guide mandrel 408 is the direction of the guide tool.
The rotary drill collar 413 drives the guide mandrel 408 to rotate through a plurality of torque transmission cylinders 411, and the motor 402 drives the eccentric shaft 406 to rotate in the same speed and opposite directions with the drill collar 413, namely the eccentric shaft 406 and the guide mandrel 408 rotate in the same speed and opposite directions, so that the deflected guide mandrel 408 forms a fixed direction which is static relative to the ground;
the position of the maximum eccentricity of the eccentric shaft 406 at the circumference of the borehole (360 degrees) determines different directions of the guiding mandrel 408, the measuring and control system 303 tracks, feeds back and adjusts the directions in real time, and the lower end of the guiding mandrel 408 is directly connected with the drill bit, so that the drill bit is kept to drill in the controlled direction.
Preferably, the present embodiment is designed with the drill collar 413 at the bottom of the tool configured with a stabilizer strip 414, such that the lower stabilizer becomes the near bit stabilizer, which abuts the bit.
In order to realize the bending point of the structure to be close to the drill bit, the universal joint structure consisting of the guide mandrel 408, the spherical hinge 410, the spherical bearing 409 and the spherical bearing 412 is designed, and the spherical center 431 of the spherical hinge is ensured to be coincident with the central point of the near-bit stabilizer 414.
After the design shown in fig. 4-7 is adopted, the guiding mandrel 408 of the present embodiment can deflect around the spherical hinge center 431 under the pushing of the eccentric shaft 406, the deflection angle formed by the axis of the drill collar 413 is the structural bending angle, the size of the bending angle is determined by the eccentric amount of the eccentric shaft, the spherical hinge universal joint structure is close to the drill bit to the maximum extent, and the maximum possible structural bending angle can be obtained. The lower end of the eccentric shaft 406 and the upper end of the guide mandrel 408 are of an insertion structure, and a ball bearing group 407 is arranged between the lower end of the eccentric shaft and the upper end of the guide mandrel 408; the eccentric shaft is driven by the output shaft 405 of the speed reducer to do fixed-shaft rotation motion, and the guide mandrel is stirred by the ball bearing to freely swing around the spherical center of the spherical hinge to form a fixed deflection angle; the ball bearing group ensures the motion relation of the eccentric shaft and the guide mandrel and does not generate motion interference. A plurality of columnar torque transmission columns 411 are uniformly distributed between the drill collar 413 and the spherical hinge 410 along the circumference, and the torque is transmitted by matching of columnar grooves of the drill collar and the spherical hinge, and the torque transmission is characterized by being stable and larger than the torque transmitted by universal joints with the same diameter and other structural forms.
As a preferable mode, in order to ensure reliable operation of each moving part and to improve the service life thereof, a positive pressure balance type lubricating oil tank is designed in the guide execution unit 4.
A lubricating oil tank: the cavity is mainly formed by the cavity between the inner wall of each drill collar of the guide execution unit 4 and the outer wall of the flexible elongated drilling fluid isolation pipe 422. The multi-core high-pressure sealing connector comprises a sealing hole 419, an O-shaped sealing ring 420 and an O-shaped sealing ring 421 to form upper end sealing, an O-shaped sealing ring 430, a drilling fluid isolating pipe sealing head 432, an O-shaped sealing ring 433 of the multi-core high-pressure sealing connector, a spherical sealing ring 434, an O-shaped sealing ring 435 and an elastic component 436 to form lower end sealing, an oil filling hole 427, a one-way valve 428 and an air outlet 429 are arranged on the wall of a drill collar, and an internal positive pressure and external pressure balance structure is arranged in the middle of an oil tank.
The external pressure balance type oil tank has the advantages that: on the outer side of the floating sealing plug 424, the hole 426 on the drill collar wall is used for communicating with the drilling fluid outside the tool, and a balanced oil tank is formed because the lower end of the oil tank is sealed and bears the pressure of the drilling fluid outside the tool. By adopting the balanced oil tank, the problems that the oil tank is easy to be sealed and lose efficacy due to oil expansion caused by continuous increase of bottom hole pressure and bottom hole temperature along with the change of well depth can not be caused.
Formation and advantage of positive pressure in the oil tank: when the oil tank is filled with oil through the oil filling hole 427 and the check valve 428, the air outlet 429 of the oil tank is blocked, oil is continuously filled into the oil tank, the lubricating oil continuously enters the oil storage cavity 423, the floating sealing plug 424 compresses the spring 425 under the action of oil pressure, and the pressure in the oil cavity is continuously increased to form a positive pressure oil tank. Based on the balance of external pressure of the oil tank, the positive pressure type oil tank is adopted, the internal pressure is higher than the external pressure, external drilling fluid can be effectively prevented from entering the oil tank, so that the sealing capability of the sealing structure of the oil tank is further improved, particularly inevitable trace leakage of lubricating fluid under the dynamic sealing condition is avoided, the positive pressure type oil tank plays a role in compensating the oil tank, and the service life of a tool is obviously prolonged.
The lower end of the flexible elongated drilling fluid isolation tube 422 can swing along with the guide mandrel, and in order to prevent premature sealing failure of the lower end and fatigue damage of the isolation tube, the sealing head 432 of the fluid isolation tube is designed into a spherical structure and a multi-channel O-shaped sealing ring structure which is suitable for the spherical structure and the swinging motion state.
In order to prevent that great detritus granule from getting into the oil tank lower extreme and probably damaging seal structure, influence sealed effect, set up sealed neck ring structure 437 in the middle of terminal surface and the direction dabber under the instrument.
The method of improving the tool whiplash ability (build rate) is analyzed below in conjunction with fig. 8-12.
There are generally 2 methods to predict tool whiplash capability: geometric analysis (three-point circle method) and mechanical analysis. The three-point rounding method is a simple estimation of the build-up rate of the tool from a geometrical relationship, assuming that the tool is completely rigid, i.e. the tool does not undergo any elastic deformation downhole. The mechanical analysis method is based on the stress and elastic deformation of the drilling tool assembly of the tool, and the lateral force and the drill inclination angle are generated due to the stress deformation of the drilling tool assembly, and the lateral force causes lateral cutting displacement, so that the well deviation and the azimuth change are generated, and the deflecting capability of the tool is predicted.
Comparing the two methods, the change trends of the two methods are basically consistent in the aspect of analyzing the influence of the key parameters on the tool build rate; the mechanical analysis method is based on stress and elastic deformation and considers the influence of various factors such as bit pressure, the outer diameter of a stabilizer, the rigidity of a drilling tool, the specific structural dimension parameter of a tool and the like, and is closer to the actual condition than a three-point circle method; the three-point circle method has the advantages that mathematical formula representation and graphic description are simpler and more visual than a mechanical analysis method, and clear analysis of key factors in the process of cutting is facilitated. Based on this, the present application describes the proposed method for increasing the build rate by using the three-point circle method.
The directional rotary steerable tool can be simplified as a stiff beam as shown in fig. 8(a) or fig. 8(b), with the build rate according to the three-point-circle method:
for fig. 8(a):
for fig. 8 (b):
in the formula: k is the tool build rate, unit degree/30 m; l is1、L2And L3The distances from the bending points of the upper stabilizer, the lower stabilizer (near bit stabilizer) and the tool structure to the bottom surface of the bit are respectively in m; γ is the structural bend angle of the tool, in units (°); dwIs the borehole diameter in mm; d1、D2And DbRespectively, the outer diameters of the upper stabilizer, the lower stabilizer and the drill bit are in mm.
According to the above formula and diagram, in 81/2in wellbore, 73/4For example, in the case of an in-tool, the method for improving the build rate of the in-tool mainly comprises:
the method comprises the following steps: having the lower stabilizer center near the structural knee point can significantly increase the tool build rate.
By way of example. Suppose L1＝4.8m、L3＝0.8m、γ＝1.2°、Dw＝216m、Db＝216m、D1＝212m、D2＝215m，L2The tool build rate trend is shown in fig. 9 when the tool build rate is increased from 0.4m to 1.2 m. In the figure: when L is2≤L3Then, the formula (1) in fig. 8(a) is adopted for calculation; when L is2>L3Then, the calculation is performed by using the formula (2) shown in fig. 8 (b). As seen from the figure: when L is2When the lower stabilizer center coincides with the structural bending point, the build rate reaches a maximum value at 0.8m, and therefore, the tool build rate can be remarkably increased by making the lower stabilizer center close to the structural bending point.
The method 2 comprises the following steps: bringing the structural knee point closer to the center of the lower stabilizer also significantly increases the tool build rate.
By way of example. Suppose L1＝4.8m、L2＝0.8m、γ＝1.2°、Dw＝216m、Db＝216m、D1＝212m、D2＝215m，L3The tool build rate trend is shown in fig. 10 when the tool build rate is increased from 0.4m to 1.2 m. In the figure: when L is3≥L2Then, the formula (1) in fig. 8(a) is adopted for calculation; when L is3<L2Then, the calculation is performed by using the formula (2) shown in fig. 8 (b). As seen from the figure: when L is3When the structural bending point coincides with the center of the lower stabilizer, the build rate reaches the maximum value, so that the approach of the structural bending point to the center of the lower stabilizer can significantly improve the build rate of the tool.
The method 3 comprises the following steps: it is recommended to arrange the lower stabilizer centrally below the structure knee.
As known from methods 1 and 2, the build rate reaches a maximum value when the lower stabilizer coincides with the structural knee point. However, due to the influence of the length of the stabilizer itself or the limitation of the structural design, it is difficult to precisely align the center of the lower stabilizer with the structural bending point in the actual situation, and therefore, it is generally considered that there is a distance between the center of the lower stabilizer and the structural bending point, and when the center of the lower stabilizer is arranged below the structural bending point according to the variation trend of the build rate of the tool in fig. 9 and 10, the influence of the distance on the build rate is small, so that it is recommended to arrange the center of the lower stabilizer below the structural bending point.
The method 4 comprises the following steps: the increase of the structural bend angle can directly improve the build rate.
As can be seen from the equations (1) and (2), the tool build rate is directly proportional to the structural bend angle, so increasing the structural bend angle can directly improve the tool build rate. But considering the structural bend angle gamma, the length L from the structural bend point to the drill bit3These 2 parameters have the effect of mutual gain. Because, to the utility model discloses a directional formula guiding tool, structure bend point position is located the drill collar center, if bent angle gamma is too big, connects the bent angle mechanism of drill bit and will receive the restriction of drill collar structure, structurally produces radial interference, has restricted bent angle gamma's increase, if move down the bent point and reduced the length L of bent point to drill bit promptly3The problem of structural interference is solved, and the distance between a bending point and a drill bit is reduced while the bend angle is increased.
The method 5 comprises the following steps: the tool build rate can be improved by appropriately shortening the distance between the upper stabilizer and the lower stabilizer.
By way of example. Suppose L2＝1.0m、L3＝1.5m、γ＝1.2°、Dw＝216m、Db＝216m、D1＝212m、D2＝215m，L1The tool build rate trend is shown in fig. 11 when the tool build rate is increased from 3.0m to 5.0 m. In this example L2≤L3The calculation is performed by using the formula (1) shown in fig. 8 (a). From the calculation results, L1The smaller the stabilizer, the better, but not the actual situation, the upper stabilizer has the function of stabilizing the whiplash, and the position of the upper stabilizer is optimized in combination with the analysis of the mechanical characteristics of the tool combination, and the distance between the two stabilizers is designed to be between 2.5m and 3.5 m.
The method 6 comprises the following steps: increasing the outer diameter of the lower stabilizer enables a small increase in the tool build rate.
As can be seen from the formulas (1) and (2), increasing the outer diameter of the lower stabilizer can increase the tool build rate, and the effect is illustrated by examples. Suppose L1＝4.0m、L2＝1.0m、L3＝1.5m、γ＝1.2°、Dw＝216m、Db＝216m、D1＝212m，D2The tool build rate trend is shown in fig. 12 when the tool build rate is increased from 210mm to 216 mm. In this example L2≤L3The calculation is performed by using the formula (1) shown in fig. 8 (a). From the calculation results, it is found that increasing the outer diameter of the lower stabilizer can increase the build rate by a small amount, from 210mm to 216mm, and the build rate can be improved by 3.5 °/30 m. However, the increase of the outer diameter of the stabilizer causes the friction to be larger, and increases the risk of getting stuck in tripping, and the outer diameter of the lower stabilizer is recommended to be designed between 212mm and 214 mm.
By combining the methods, the measure for improving the deflecting capability of the tool is as follows: the structure bend angle is increased as much as possible, the lower stabilizer and the structure bending point are close to the drill bit as much as possible, the structural design ensures that the central point of the lower stabilizer and the structure bending point are close to or coincident with each other in the axial direction as much as possible, and meanwhile, the distance between the upper stabilizer and the near drill bit stabilizer is preferably selected, and the outer diameter of the lower stabilizer is properly increased.
From the above description, it can be known that the fully-rotating directional steering tool and the method for optimizing the design of the build rate provided by the embodiment can not only meet the requirement of fine control of the well track, but also significantly improve the steering capability (the build rate is greater than 15 °/30m) of the fully-rotating directional steering tool, and realize "one-trip drilling" drilling operation (continuous drilling in a straight well section, a deflecting well section and a horizontal well section).
In this embodiment, while, for purposes of simplicity of explanation, the methodologies are shown and described as a series of acts, it is to be understood and appreciated that the methodologies are not limited by the order of acts, as some acts may, in accordance with one or more embodiments, occur in different orders and/or concurrently with other acts from that shown and described herein or not shown and described herein, as may be understood by those of ordinary skill in the art.
It is noted that references in the specification to "one embodiment," "an example embodiment," "some embodiments," etc., indicate that the embodiment described may include a particular feature, structure, or characteristic, but every embodiment may not necessarily include the particular feature, structure, or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the art to effect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.
The previous description of the disclosure is provided to enable any person skilled in the art to make or use the disclosure. Various modifications to the disclosure will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other variations without departing from the spirit or scope of the disclosure. Thus, the disclosure is not intended to be limited to the examples and designs described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. A full rotation directional steering tool, comprising:
the inner cavity of the drill collar (413) is connected with a spherical hinge (410) through spherical bearings (409, 412), and a plurality of torque transmission columns (411) are arranged between the spherical hinge (410) and the inner wall of the drill collar (413);
the guide mandrel (408) penetrates through the spherical hinge (410) and is fixedly connected with the spherical hinge, the lower end of the guide mandrel is connected with a drill bit, and the upper end of the guide mandrel is connected with the eccentric shaft (406) through a ball bearing set (407);
the eccentric shaft (406) is driven to rotate by a motor (402) arranged in the drill collar (413).
2. A full rotation directional guide tool according to claim 1, comprising:
the spherical center of the spherical hinge (410) is positioned on the axis of the drill collar (413), and under the radial pushing of the eccentric shaft (406), the guide mandrel (408) deflects by taking the spherical center as a fulcrum, so that the axis of the guide mandrel and the axis of the drill collar (413) form a fixed deflection angle to form the direction of a guide tool.
3. A full rotation directional steering tool according to claim 1, characterized in that the outer wall of the drill collar (413) is provided with several stabilizing strips (414) for forming near bit stabilizers.
4. A full rotation directional guide tool according to claim 1, characterized in that the lower end of the eccentric shaft (406) and the upper end of the guide spindle (408) are of an insertion structure, between which the ball bearing set (407) is disposed.
5. The full rotation directional guide tool according to claim 1, wherein a multi-core connection cylinder (401), a motor (402), a rotary transformer (403), a reducer (404) and a reducer output shaft (405) are sequentially arranged in the drill collar (413), and the eccentric shaft (406) is connected with the reducer output shaft (405).
6. A full rotation directional guide tool according to claim 5, characterized in that the reducer output shaft (405) is housed in an L-shaped reducer output shaft housing, and an oil reservoir (423) is provided between the reducer output shaft housing and the drill collar (413); a floating sealing plug (424) is arranged between the reducer output shaft shell and the drill collar (413), and the floating sealing plug (424) is connected to one L-shaped side of the reducer output shaft shell through a compression spring (425); the upper end of a flexible long and thin drilling fluid isolation tube (422) and the inner cavity of the multi-core wiring column body (401) are sealed, and the lower end of the flexible long and thin drilling fluid isolation tube penetrates through the guide mandrel (408) and then is blocked by a drilling fluid isolation tube sealing head (432) arranged in the inner wall of the guide mandrel (408); lubricating oil is filled between the drilling fluid isolation pipe (422) and the drill collar (413).
7. A full rotation directional guide tool according to claim 6, characterized in that the drill collar (413) is provided with a through hole (426) between a floating sealing plug (424) and the reducer output shaft housing L-shaped side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022782731.XU CN213953512U (en) | 2020-11-26 | 2020-11-26 | Full-rotation directional guide tool |
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| CN112502626A (en) * | 2020-11-26 | 2021-03-16 | 中国石油天然气集团有限公司 | Full-rotation directional type guiding tool and design method for improving build-up rate structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112502626A (en) * | 2020-11-26 | 2021-03-16 | 中国石油天然气集团有限公司 | Full-rotation directional type guiding tool and design method for improving build-up rate structure |
| CN112502626B (en) * | 2020-11-26 | 2024-06-18 | 中国石油天然气集团有限公司 | Full-rotation directional guiding tool and structural design method for improving slope |
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Effective date of registration: 20230328 Address after: 100120 Xicheng District six paw Kang in Beijing City Patentee after: CHINA NATIONAL PETROLEUM Corp. Patentee after: CNPC ENGINEERING TECHNOLOGY R & D Co.,Ltd. Patentee after: BEIJING PETROLEUM MACHINERY Co.,Ltd. Address before: 100120 Xicheng District six paw Kang in Beijing City Patentee before: CHINA NATIONAL PETROLEUM Corp. Patentee before: CNPC ENGINEERING TECHNOLOGY R & D Co.,Ltd. |