CN102865038B - A kind of offset guide mechanism of dynamic guiding type rotary steering drilling tool - Google Patents

Abstract

A kind of offset guide mechanism of dynamic guiding type rotary steering drilling tool, including rotating urceolus, stabilized platform, biasing mechanism, upper and lower support plate, auger spindle, drill bit, conducting slip ring and connecting bearing, this device, by keeping relative position and the relative position of biasing mechanism with stabilized platform main body that stabilized platform is the most static, adjust inside and outside eccentric hoop, can realize structure bent angle, particularly hole angle and azimuthal accurate control in drilling process.Present configuration is reasonable in design compact, the offset guide mechanism design method of a kind of effective dynamically guiding type rotary steering drilling tool of can yet be regarded as.

Description

A kind of offset guide mechanism of dynamic guiding type rotary steering drilling tool

Technical field

The present invention relates to a kind of dynamic guiding type rotary steering drilling tool including but not limited to petroleum gas field, the offset guide mechanism of the most described drilling tool.

Background technology

Down-hole rotary steering drilling tool system is divided into pushing type and directional type according to its guidance mode, quiescent biasing formula and dynamic bias formula can be divided into again according to the working method of biasing mechanism, in terms of applicable cases, the deflecting ability of directional type rotary steerable drilling system does not relies on the contact with the borehole wall, it is more applicable for big hole diameter or out-of-round oversized hole, soft formation, the unsettled sidetracking of bore hole of dead-soft bottom and interlayer etc., make to creep into dog-leg severity and lateral drilling deflecting ability greatly improves, contribute to controlling well the optimum position at oil reservoir, improve wellbore quality, ensure downhole safety.And wherein dynamically directional type rotary steerable drilling system is fully rotating due to its BHA especially, get out well smooth, regular, and rate of penetration can be effectively improved, increase moment of torsion, regulation the pressure of the drill, give full play to bit performance, welcome by oilfield drilling companies many in world wide.

It can be said that dynamically guiding type rotary steering drilling tool system is the acme of world today's drilling technology development, represent the developing direction of high-precision directional drill well technology.Technically, dynamic directional type rotary steerable drilling system is one and integrates mechanical, electrical, the closed loop automatic control system of liquid, and its deflecting ability does not relies on the contact with the borehole wall, and all parts are fully rotating as technical characteristics with down-hole.

World-renowned petroleum technology service company BakerHughes, Schlumberger, Halliburton etc. have been developed over respective rotary steering drilling tool system.The units such as domestic Xi'an Petroleum University, Shengli Oil Field drilling well institute, CNOOC Research Center, China University of Geosciences, Southwest Petrol University, Liaohe Oil Field providence petroleum equipment company have also carried out rotary steerable drilling technical research, achieve certain achievement in research successively.Generally, rotary steering closed loop drilling technology is still in the fast-developing stage, and international competition is the fiercest.Chinese patent notification number CN101586440A, publication date on November 25th, 2009, (this patent application is also utility model patent mandate to entitled a kind of guiding type rotary steering drilling tool of innovation and creation, Authorization Notice No.: CN201450731U, authorized announcement date on May 12nd, 2010), this application case discloses a kind of mechanics of surface characteristic being independent of stratum, simple in construction, and can accurate and effective control well track guiding type rotary steering drilling tool system, it it is quiescent biasing guiding type rotary steering drilling tool system in this system nature, it is disadvantageous in that when the most described drilling tool works, urceolus does not rotates, its action torque is less；The guiding of the most described drilling tool is realized by mandrel bending, and this guiding mandrel is subjected to the alternate stress of high intensity, is susceptible to fatigue damage.

nullU.S. Patent number 6,109,372，March 15 1999 applying date，Grant date on August 29th, 2000，The rotary steering drilling tool system (RotarySteerableWellDrillingSystemUtilizingHydraulicServo-loop) that the entitled employing Hydraulic Servo-Loop of innovation and creation controls，This case discloses a kind of based on dynamic directional type rotary steerable tool，Its urceolus directly drives biasing mechanism and then drives bit，Uninterruptedly moved by two groups of X-Y direction hydraulic drive piston the relative position of biasing mechanism and urceolus when controlling work，To reach the purpose pointed to，Its feature is to need the most known urceolus rotary speed accurately，And the run location of the two groups of hydraulic drive piston in servo antrol X-Y direction，The simultaneous of hydraulic drive piston displacement and urceolus rotating speed controls itself high load capacity work in addition，The difficulty being accurately directed to control can be increased undoubtedly.

U.S. Patent number 6, 092, 610, February 5 1998 applying date, grant date on July 25th, 2000, the rotary steering drilling tool System and method for (ActivelyControlledRotarySteerableSystemandMethodforDrill ingWells) that the entitled active of innovation and creation controls, this case discloses a kind of dynamically guiding type rotary steering drilling tool system, its urceolus drives auger spindle and then drives bit, produce bigger rotation torque, this case proposes a kind of directional type guiding mechanism based on eccentric shaft simultaneously, its structure bent angle can change between design maximum angle at 0 °, by ensureing that eccentric shaft geography is static, can constant structure bent angle value.Its feature is, when being not required to adjust structure bent angle and azimuth need to be adjusted, first eccentric shaft geography resting state is destroyed, when eccentric shaft turns arrives required orientation, make its constant speed traceback urceolus rotating speed again, this case fails clearly to illustrate eccentric hoop type of drive in detail simultaneously, it is impossible to learn eccentric stiffener details.

Summary of the invention

For the problems referred to above, it is an object of the invention to provide the offset guide mechanism design method of a kind of dynamic guiding type rotary steering drilling tool based on double eccentric hoop motion principles, structure bent angle, particularly hole angle and azimuthal accurate control in drilling process can be realized.Present configuration is reasonable in design compact, the offset guide mechanism design method of a kind of effective dynamically guiding type rotary steering drilling tool of can yet be regarded as.

The present invention is achieved through the following technical solutions above-mentioned purpose:

Dynamically guiding type rotary steering drilling tool offset guide mechanism, it is the important component part of dynamic guiding type rotary steering drilling tool, including rotating urceolus, stabilized platform, guide offset mechanism, upper and lower support plate, auger spindle, drill bit, conducting slip ring and connecting bearing.

Rotating urceolus is the hollow ring body that a wall thickness is thicker, both drilling rod and MTR or one drive, for applying bigger the pressure of the drill and moment of torsion to drilling tool.

Stabilized platform is placed in rotation outer barrel, including hollow cylindrical body, connect bearing, servomotor and supporting shaft coupling, stabilized platform agent structure develops from the Rotary-table that diameter is up-small and down-big, upper end is stretched out longer, connected fixing by being arranged on the lower supporting plate rotating urceolus with the bearing being embedded, lower end is the hollow circular cylinder that wall thickness is relatively thin, connect and closely cooperate with rotation outer tube inner wall outside bearing, inner side stable connection main platform body, servomotor is arranged on the upper backup pad rotating urceolus, shaft coupling is used for connecting servomotor and stabilized platform main body, according to rotating urceolus rotation situation, driven by servomotor stabilized platform main body constant speed phase despining, keep the most static under making it in working order.

Guide offset mechanism is positioned at stabilized platform body interior, rotate freely with relative by connecting bearing realization location, it includes interior eccentric hoop and outer eccentric hoop and supporting driving servomotor thereof and shaft coupling, interior eccentric hoop is placed among outer eccentric hoop, its close contacting fit realizes by connecting bearing with the relative connection status rotated freely, eccentric ducted body central axis in two eccentric hoops is angled with eccentric hoop body central axis, and this angle determines the maximum possible structure bent angle value that guide offset mechanism can guide.

When dynamically the conducting slip ring in guiding type rotary steering drilling tool can not be worked by each parts, rotation status is affected and power supply and control signal is caused on servomotor.

Present configuration is compact, reasonable in design, easy to adjust, the rotary drilling mode dynamically pointed to by it, the drilling process of horizontal well, extended reach well, high angle hole and Multilateral Wells etc. effectively can be guided, and moment of torsion, regulation the pressure of the drill can be increased, improve rate of penetration, give full play to bit performance, and then improve drilling efficiency.

Accompanying drawing explanation

Below in conjunction with the accompanying drawings the specific embodiment of the present invention is described in further detail.

Fig. 1 embodiment of the present invention generalized section；

Inside and outside eccentric hoop position view during Fig. 2 embodiment of the present invention structure bent angle maximum；

Inside and outside eccentric hoop position view when Fig. 3 embodiment of the present invention structure bent angle is zero；

Fig. 4 embodiment of the present invention structure bent angle calculates schematic diagram with interior eccentric hoop relative to the anglec of rotation mathematical relationship of outer eccentric hoop；

1-drill bit, 2-auger spindle, 3-rotates urceolus, the outer eccentric hoop of 4-, 5-stabilized platform connects bearing, the outer eccentric hoop of 6-connects bearing, the outer eccentric hoop conducting slip ring of 7-, 8-stabilized platform main body, 9-stabilized platform conducting slip ring, 10-lower supporting plate, 11-stabilized platform servomotor, 12-upper end conducting slip ring, 13-upper backup pad, 14-stabilized platform servomotor shaft coupling, the embedded bearing of 15-lower supporting plate, the outer eccentric hoop servomotor of 16-, the outer eccentric hoop servomotor shaft coupling of 17-, eccentric hoop servomotor in 18-, eccentric hoop servomotor shaft coupling in 19-, eccentric hoop in 20-, in 21-, eccentric hoop connects bearing, 22-auger spindle connects bearing, 23-seal bellows；

Eccentric hoop central axis, outer (interior) eccentric hoop lower surface of D-, the outer eccentric hoop central axis A of E-and the hollow hole axis B of eccentric hoop in the outer intersection point of (interior) eccentric hoop lower surface D, G-and the intersection point of eccentric hoop central axis C and interior eccentric hoop central axis C in the outer intersection point of (interior) eccentric hoop lower surface D, F-in the hollow hole axis of eccentric hoop, C-in A-outer eccentric hoop central axis, B-, the hollow hole axis B of the outer eccentric hoop central axis A of O-and interior eccentric hoop and interior intersection point common for eccentric hoop central axis C.

α-structure bent angle, β-interior eccentric hoop relative to the anglec of rotation of outer eccentric hoop is, θ-outer eccentric hoop central axis A and the angle of interior eccentric hoop central axis C, the angle of hollow hole axis B and interior eccentric hoop central axis C of φ-interior eccentric hoop.

Detailed description of the invention

Below with reference to accompanying drawing, the preferred embodiments of the present invention are described in detail；Should be appreciated that preferred embodiment is only for the explanation present invention rather than in order to limit the scope of the invention.

Embodiments provide the dynamic guiding type rotary steering drilling tool in a kind of down-hole for but not limited to natural petroleum gas field, in particular, provide a kind of based on stabilized platform with the offset guide mechanism of inside and outside pair of eccentric hoop.The guidance mode of this instrument is directional type, and the working method of guide offset mechanism is dynamic bias formula.Rotating urceolus in the embodiment of the present invention to be connected with drill string or drill pipe system, drill bit is connected with auger spindle；Inside and outside double eccentric hoop biasing mechanism is placed in stabilized platform body interior, motor drive and make it equal in magnitude with the rotation urceolus speed of rotation, in opposite direction, keeps geographical resting state；In drilling process, rotate urceolus and rotate all the time, and moment of torsion and the pressure of the drill are passed to drill bit efficiently；By eccentric hoop in adjusting with the relatively rotation place of outer eccentric hoop, auger spindle centrage and urceolus centrage formed structure bent angle can be realized from 0 ° to arranging change max architecture bent angle value；By adjusting the biasing mechanism relatively rotation place with stabilized platform main body, any control azimuth in the range of auger spindle centrage can be made to point to 360 °, the four corners of the world.

Fig. 1 is embodiment of the present invention generalized section.This dynamic guiding type rotary steering drilling tool offset guide mechanism, including rotating urceolus 3, stabilized platform, biasing mechanism, upper backup pad 13, lower supporting plate 10, auger spindle 2, drill bit 1, conducting slip ring and connecting bearing.

Specifically, it is internal that stabilized platform is placed in rotation urceolus 3, including hollow cylindrical stabilized platform main body 8, stabilized platform connects bearing 5, stabilized platform servomotor 11 and supporting stabilized platform servomotor shaft coupling 14, stabilized platform main body 8 upper end is connected fixing by the lower supporting plate 10 and the embedded bearing of lower supporting plate 15 being arranged on rotation urceolus 3, lower end connects bearing 5 by stabilized platform and closely cooperates with rotating urceolus 3 inwall, stabilized platform servomotor 11 is arranged on upper backup pad 13 lower surface rotating urceolus 3, upper backup pad 13 is rotating on urceolus 3 with lower supporting plate 10 by interior hexagonal screw threads for fastening, and move the most together；Stabilized platform servomotor shaft coupling 14 is for stable connection platform servomotor 11 and stabilized platform main body 8, and stabilized platform servomotor 11 drives stabilized platform main body 8 relative to rotating urceolus 3 constant speed phase despining so that it is lower holding is the most static in working order.

nullIt is internal that biasing mechanism is positioned at stabilized platform main body 8，Connect bearing 6 realization location by outer eccentric hoop to rotate freely with relative，It includes interior eccentric hoop 20 and outer eccentric hoop 4 and supporting outer eccentric hoop servomotor 16 thereof、Outer eccentric hoop servomotor shaft coupling 17、Interior eccentric hoop servomotor 18、Interior eccentric hoop servomotor shaft coupling 19 and interior eccentric hoop connect bearing 21，Outer eccentric hoop servomotor 16 is used for rotating the outer eccentric hoop 4 of driving，The two realizes connecting by outer eccentric hoop servomotor shaft coupling 17，Interior eccentric hoop servomotor 18 is used for rotating eccentric hoop 20 in driving，The two realizes connecting by interior eccentric hoop servomotor shaft coupling 19，Interior eccentric hoop 20 is together with interior eccentric hoop servomotor 18、It is internal that interior eccentric hoop servomotor shaft coupling 19 is placed in outer eccentric hoop 4，Its close contacting fit connects bearing 21 with the relative connection status rotated freely by interior eccentric hoop and realizes.In interior eccentric hoop 20, vacancy is embedded with auger spindle and connects bearing 22, and inner ring is placed in end connector on auger spindle 2, and described auger spindle connects bearing 22 and is used for guiding auger spindle 2 structure bent angle and azimuth, and realizes the independently rotated of auger spindle 2 and interior eccentric hoop 20.

Fig. 2, Fig. 3 describe the guide offset mechanism guiding principle of the embodiment of the present invention.Outer eccentric hoop 4 central axis A is parallel with former well track axis, and auger spindle 3 upper end is positioned in the hollow hole of eccentric hoop 20, and this axially bored line B with A forms an angle, i.e. structure bent angle α.When inside and outside eccentric hoop has relative circular movement, structure bent angle α is by consecutive variations between 0 ° and the max architecture bent angle value that designed；If when inside and outside eccentric hoop rotates together when keeping geo-stationary, this structure bent angle may point to arbitrary orientation.

It needs to be noted, outer eccentric hoop 4 hollow hole central axis and central axis A not only have a design offset distance at lower surface, and there is an angle, interior eccentric hoop hollow hole central axis B and interior eccentric hoop central axis C design offset distance value as lower surface has, and this two central axis has same design angle value, 2 times of values of this design angle value are max architecture bent angle value.

Inside and outside eccentric hoop position view when Fig. 2 further describes embodiment of the present invention structure bent angle maximum.nullIn figure，Outer eccentric hoop central axis A meets at an E with outer (interior) eccentric hoop lower surface D、The hollow hole axis B of interior eccentric hoop meets at a G with outer (interior) eccentric hoop lower surface D、Interior eccentric hoop central axis C meets at a F with outer (interior) eccentric hoop lower surface D，Outer eccentric hoop central axis A intersects at an O jointly with the hollow hole axis B and interior eccentric hoop central axis C of interior eccentric hoop，Outer eccentric hoop central axis A、In the hollow hole axis B and interior eccentric hoop central axis C of interior eccentric hoop is generally aligned in the same plane，Intersection point E is the longest with intersection point G distance EG，Double design offset E F of outer eccentric hoop 4 hollow hole central axis and central axis A D lower surface, (interior) eccentric hoop lower surface outside，Namely double the design offset distance FG of interior eccentric hoop hollow hole central axis B and interior eccentric hoop central axis C D lower surface, (interior) eccentric hoop lower surface outside；Structure bent angle α is outer eccentric hoop central axis A and the included angle sum of the hollow hole axis B and interior eccentric hoop central axis C of the angle theta of interior eccentric hoop central axis C and interior eccentric hoop, owing to this two angle is to set clocking requirement identical, therefore structure bent angle α doubles θ or φ.

Fig. 3 further describes inside and outside eccentric hoop position view when embodiment of the present invention structure bent angle is zero.Now, interior eccentric hoop 20 relative to the angular displacement of outer eccentric hoop 4 than in Fig. 3 180 ° clockwise or counterclockwise.In figure, outer eccentric hoop central axis A overlaps with the hollow hole axis B of interior eccentric hoop, E or G is given with outer (interior) eccentric hoop lower surface D, interior eccentric hoop central axis C meets at a F with outer (interior) eccentric hoop lower surface D, outer eccentric hoop central axis A intersects at an O jointly with the hollow hole axis B and interior eccentric hoop central axis C of interior eccentric hoop, in outer eccentric hoop central axis A, the hollow hole axis B of interior eccentric hoop and interior eccentric hoop central axis C are generally aligned in the same plane, intersection point E is the shortest with intersection point G distance EG is zero；Structure bent angle α is also zero.

Fig. 4 further describes embodiment of the present invention structure bent angle from the general extent and calculates schematic diagram with interior eccentric hoop relative to the anglec of rotation mathematical relationship of outer eccentric hoop；nullFigure China and foreign countries eccentric hoop central axis A meets at an E with outer (interior) eccentric hoop lower surface D、The hollow hole axis B of interior eccentric hoop meets at a G with outer (interior) eccentric hoop lower surface D、Interior eccentric hoop central axis C meets at a F with outer (interior) eccentric hoop lower surface D，Outer eccentric hoop central axis A intersects at an O jointly with the hollow hole axis B and interior eccentric hoop central axis C of interior eccentric hoop，Outer eccentric hoop 4 hollow hole central axis and design offset E F of central axis A D lower surface, (interior) eccentric hoop lower surface outside，Interior eccentric hoop hollow hole central axis B and the design offset distance FG of interior eccentric hoop central axis C D lower surface, (interior) eccentric hoop lower surface outside，The angle theta of outer eccentric hoop central axis A and the interior eccentric hoop central axis C included angle equal to the hollow hole axis B and interior eccentric hoop central axis C of interior eccentric hoop，In addition have，Structure bent angle α、Interior eccentric hoop is β relative to the anglec of rotation of outer eccentric hoop.

Further, have,

$\mathrm{\α}=2arcsin\left(sin\right(\frac{\mathrm{\β}}{2}\left)\sin \mathrm{\θ}\right)=2arcsin\left(sin\right(\frac{\mathrm{\β}}{2}\left)sin\mathrm{\φ}\right)---\left(1\right)$

The embodiment of the present invention also includes three guide links for connecting each servo motor power supply and control signal wire, has the outer eccentric hoop conducting slip ring 7 for connecting interior eccentric hoop servomotor 18 power supply and control signal wire being arranged on outer eccentric hoop 4 upper end specifically；Be arranged on stabilized platform main body 8 upper end for connecting outer eccentric hoop servomotor 16 and interior eccentric hoop servomotor 18 power supply and the stabilized platform conducting slip ring 9 of control signal wire；Be arranged on upper backup pad 13 lower surface for stable connection platform servomotor 11, outer eccentric hoop servomotor 16 and interior eccentric hoop servomotor 18 power supply and the upper end conducting slip ring 12 of control signal wire.

In the embodiment of the present invention, each driving all uses hollow shaft type servomotor, hollow gap is left in the certain limit of this embodiment central axis, inside has mud to run passage, make mud run to eject from drill bit 1 to drill bit 1 inside, then return to ground by the annular space between rotation urceolus 3 and the borehole wall.Particularly, sealing as very important auger spindle 2 can realize with seal bellows 23 with the mud rotating outer barrel, similarly, seal bellows can also realize auger spindle 2 and be connected the good mud sealing effectiveness of bearing 22 with interior eccentric hoop 20 and auger spindle.

The embodiment of the present invention also provides for that a kind of well track for this dynamic guiding type rotary steering drilling tool offset guide mechanism is servo-actuated and stable control method.Hole angle to be controlled and azimuth information is calculated by computing unit according to preset well track parameter, and combine inside and outside eccentric hoop biasing mechanism operation principle, draw desired structure bent angle value, so in adjusting eccentric hoop 20 relative to the outer relative position of eccentric hoop 4 and biasing mechanism relative to the relatively rotation place of stabilized platform main body 8.For realizing above-mentioned control, using two close cycles Based on Double Fuzzy-PID Controller, wherein closed loop I mainly realizes stabilized platform main body 8 and follows the reverse constant speed control rotating urceolus 3, it is achieved its geography is static, and this is extremely important to being accurately directed to control；Rotation urceolus 3 actual speed measurement result is constantly adjusted to servo follow-up tracing variable, can be selected for the sensor of the different principle such as electric capacity, photoelectricity, Hall, perception rotates urceolus 3 and the positive and negative drilling speed difference of stabilized platform main body 8, utilizes fuzzy controller a to realize its accurate dynamic servo-actuated reverse constant speed and follows the tracks of；Three axis accelerometer, magnetometer etc. is used can conveniently to calculate real well oblique angle and azimuth in closed loop II；In utilizing fuzzy controller b to realize, eccentric hoop 20 controls with the accurate of the relative position of stabilized platform main body 8 with the outer relative position of eccentric hoop 4 and biasing mechanism, rotates urceolus rotation speed change and can be compensated by hole angle to be controlled and azimuthal impact by the fine setting increment unit after being positioned at closed loop I.

The technical method of the embodiment of the present invention and scheme of machine design, can be on the premise of not affecting drillng operation, surge well oblique angle and azimuth determination data, when keeping the resting state over the ground of stabilized platform, realize hole angle and azimuthal accurate control by adjusting inside and outside eccentric hoop relative to position relative to position and biasing mechanism and stabilized platform main body.

Above example only in order to the technical scheme of the embodiment of the present invention to be described, is not intended to limit；Although the embodiment of the present invention being described in detail with reference to previous embodiment, it will be understood by those within the art that: the technical scheme described in foregoing embodiments still can be modified by it, or wherein portion of techniques feature is carried out equivalent；And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of the embodiment of the present invention each embodiment technical scheme.

Claims (8)

1. null1. the offset guide mechanism of a dynamic guiding type rotary steering drilling tool，Including rotating urceolus、Stabilized platform、Biasing mechanism、Upper backup pad、Lower supporting plate、Auger spindle、Drill bit、Conducting slip ring and connection bearing，It is characterized in that，Rotate urceolus and directly apply the pressure of the drill and moment of torsion to drill bit，Rotate urceolus and drive auger spindle、Drill bit rotates jointly，Biasing mechanism is positioned at stabilized platform body interior，Connect bearing realization location by outer eccentric hoop to rotate freely with relative，By adjusting the biasing mechanism relatively rotation place with stabilized platform main body，Auger spindle centrage any control azimuth in the range of 0～360 ° can be made，Stabilized platform is placed in rotation outer barrel，Including hollow cylindrical stabilized platform main body、Stabilized platform connects bearing、Stabilized platform servomotor、Stabilized platform servomotor shaft coupling，Stabilized platform main body upper end is connected fixing by the lower supporting plate and the embedded bearing of lower supporting plate being arranged on rotation urceolus，Lower end connects bearing by stabilized platform and closely cooperates with rotating outer tube inner wall，Stabilized platform servomotor is arranged on the upper backup pad rotating urceolus，Upper backup pad is being rotated on urceolus by interior hexagonal screw threads for fastening with lower supporting plate，And move the most together，Stabilized platform servomotor shaft coupling is for stable connection platform servomotor and stabilized platform main body，Stabilized platform driven by servomotor stabilized platform main body is relative to rotating urceolus constant speed phase despining，Keep the most static under making it in working order.
2. The offset guide mechanism of a kind of dynamic guiding type rotary steering drilling tool the most as claimed in claim 1, it is characterised in that: biasing mechanism includes that interior eccentric hoop and outer eccentric hoop and supporting outer eccentric hoop servomotor, outer eccentric hoop servomotor shaft coupling, interior eccentric hoop servomotor, interior eccentric hoop servomotor shaft coupling and interior eccentric hoop connect bearing.
3. nullThe offset guide mechanism of a kind of dynamic guiding type rotary steering drilling tool the most as claimed in claim 2，It is characterized in that: outer eccentric hoop servomotor is used for rotating the outer eccentric hoop of driving，The two realizes connecting by outer eccentric hoop servomotor shaft coupling，Interior eccentric hoop servomotor is used for rotating eccentric hoop in driving，The two realizes connecting by interior eccentric hoop servomotor shaft coupling，Interior eccentric hoop is together with interior eccentric hoop servomotor、Interior eccentric hoop servomotor shaft coupling is placed in inside outer eccentric hoop，Its close contacting fit connects bearing with the relative connection status rotated freely by interior eccentric hoop and realizes，It is arranged on the outer eccentric hoop conducting slip ring of outer eccentric hoop upper end for connecting interior eccentric hoop servo motor power supply and control signal wire，It is arranged on the upper end conducting slip ring of upper backup pad upper end for stable connection platform servomotor、Outer eccentric hoop servomotor and interior eccentric hoop servo motor power supply and control signal wire.
4. The offset guide mechanism of a kind of dynamic guiding type rotary steering drilling tool the most as claimed in claim 3, it is characterised in that: outer eccentric hoop servomotor and interior eccentric hoop servomotor are hollow shaft type motor.
5. The offset guide mechanism of a kind of dynamic guiding type rotary steering drilling tool the most as claimed in claim 2 or claim 3, it is characterised in that: outer eccentric hoop hollow hole central axis and its body central axis have a design offset distance in lower surface, and there is an angle；Interior eccentric hoop hollow hole central axis and its body central axis design offset distance value as lower surface has, and this two central axis has an equal amount of design angle value.
6. The offset guide mechanism of a kind of dynamic guiding type rotary steering drilling tool the most as claimed in claim 2, it is characterised in that: the max architecture bent angle of described biasing mechanism is 2 times of outer eccentric hoop hollow hole central axis and its body central axis designs angle value.
7. The offset guide mechanism of a kind of dynamic guiding type rotary steering drilling tool the most as claimed in claim 3, it is characterised in that: when inside and outside eccentric hoop has relative circular movement, structure bent angle is by consecutive variations between 0 ° and the max architecture bent angle value that designed.
8. The offset guide mechanism of a kind of dynamic guiding type rotary steering drilling tool the most as claimed in claim 3, it is characterized in that: auger spindle seals can realize with seal bellows with the mud rotating outer barrel, auger spindle seals can realize with seal bellows with the mud of interior eccentric hoop；This biasing mechanism can direct external drill bit, it is achieved rotary steerable drilling function.