CN103556945A - High build-up rate well track control method - Google Patents
High build-up rate well track control method Download PDFInfo
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- CN103556945A CN103556945A CN201310510905.9A CN201310510905A CN103556945A CN 103556945 A CN103556945 A CN 103556945A CN 201310510905 A CN201310510905 A CN 201310510905A CN 103556945 A CN103556945 A CN 103556945A
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Abstract
The invention relates to a high build-up rate well track control method, and belongs to the technical field of well track control methods. The high build-up rate well track control method includes an offset mechanism control method, an offset mechanism is designed by means of combined movement of eccentric rings, power derives from a drill rod, rotational movement of the drill rod is transferred to a speed reducer through an electromagnetic clutch by a coupler, the inner eccentric ring and the outer eccentric ring are respectively driven to rotate after speed is reduced by the speed reducer, so that a spindle is bent to different degrees, a dip angle inconsistent with a well axis is provided for a drill bit, the dip angle of the drill bit is controlled in a stepless manner, and a well track can be controlled. A bias drill bit is not used for guiding, the axis of the drill bit is effectively guided and controlled by controlling bending characteristics of a drill column, and a build-up rate is determined by a tool and cannot be affected by drilling formation lithology. The high build-up rate well track control method can be applied to track control for various wells such as a straight well, a directional well, an ultra-deep well, an extended reach well, an ultra-thin oil layer horizontal well, a long-distance horizontal well and a multi-branch well.
Description
Technical field
The present invention relates to a kind of high build-up rate well track control method, belong to track control method technical field.
Background technology
High build-up rate well track control method, be in order to adapt to complex structural well drillng operation the need for and invent a new and high technology, be the research emphasis and developing direction of the high build angle rate drilling well of modern society.High build-up rate well track control method, it is for carrying out steerable drilling under conditions of drill string full rotation, it is not to be oriented to by offset bit, but bias transmission main shaft by a set of bias unit not between rotary sleeve and transmission main shaft, so as to provide an inclination angle inconsistent with borehole axis for drill bit, guide effect is produced.Use high build-up rate well track control method, can be when carrying out drillng operation, need not frequently make a trip can just realize three dimensional hole trajectory control, and there is rate of penetration height, good well cleaning effect, hole trajectory control precision and flexibility are high, the number of times that makes a trip is few, hole quality is high, safe, the need for being suitable for the special well development situations such as China's complex reservoir middle-deep well, ultradeep well, ultra-thin oil reservoir horizontal well and unconventionaloil pool well.
The control Technology for Borehole Trajectory applied now, using the AutoTrak RCLS of Baker HughesInteq companies, the PowerDrive SRD and Halliburton Sperry-sun companies of Schlumberger Anadrill companies Geo-Pilot is representative and has been developed that commercially produced product.AutoTrak RCLS systems are mainly the hydraulic coupling size by controlling not 3 circumferentially uniform support ribs of rotary sleeve（3 support ribs are supported in the borehole wall with different hydraulic couplings respectively）So as to control size and Orientation with joint efforts, well track is controlled by such mode, is realized and is controlled by the bi-directional communication system (ground monitoring computer, solution code system and drilling fluid pulse signal generation apparatus) and LWD (well logging) of ground and underground.But this control mode brought displacement working method, static overcoat, poor miniaturization capability, complex structure the shortcomings of all influence the development of this system.PowerDrive systems are also similar with AutoTrak RCLS by the way of, realized and controlled by bidirectional information communication system under MWD measurement-while-drilling systems, surface well and ground-based computer monitoring system.But same to cause vibrations with impacting to drilling tool and the borehole wall because its rib block caused stretches frequently, the element such as hydraulic cylinder and distributing valve uses mud as working media, and component abrasion is severe, and extension tool life is an outstanding problem.
The content of the invention
It is an object of the invention to, offer is a kind of can be applied to the guide digging of the TRAJECTORY CONTROLs of various wells such as straight well, directional well, ultradeep well, extended reach well, ultra-thin oil reservoir horizontal well, long range horizontal well, multi-branched well and various bad grounds, when needing to change drilling direction in drilling process, corresponding control instruction is sent to bias unit, transmission main shaft is set to bend, main-shaft axis offsets original direction, completes direction controlling, and drill bit is crept into along new drilling direction；It is that existing high build-up rate well track control method tool life can be overcome short, the not enough high build-up rate well track control method such as production cost height.
The present invention is to realize above-mentioned purpose by the following technical solutions：
A kind of high build-up rate well track control method, including a rotary steerable tool and the control method to the rotary steerable tool, it is characterised in that：The rotary steerable tool includes eccentric stiffener and the deceleration device, electromagnetic clutch, sensor and the controller that are connected with eccentric stiffener, described eccentric stiffener is made up of eccentric hoop inner ring and eccentric hoop outer shroud, eccentric hoop inner ring is nested in inside eccentric hoop outer shroud endoporus, main shaft is nested in the endoporus of eccentric hoop inner ring, makes the deflecting of rotary steerable tool realization any direction in spatial dimension by eccentric hoop inner ring and rotating against for eccentric hoop outer shroud；
The described control method to rotary steerable tool comprises the following steps：
（1）, tool face azimuth and eccentric hoop position angle control
Dead-center position：Instrument outer shroud in assembling is upward compared with webbing, and compared with webbing downwards, the resultant displacement of synthesis is zero to inner ring, and main shaft is in non-eccentric state, and eccentric hoop inner ring and eccentric hoop outer shroud are in original state, and eccentric hoop outer shroud is 0 °, and eccentric hoop inner ring is 180 °；The position angle ralation method of eccentric hoop inner ring and eccentric hoop outer shroud is incorporated into software, you can monitoring in real time and control are carried out to eccentric stiffener position angle；
（2）, center displacement calculating
1）The guiding synthesis of eccentric motion
Well center where using eccentric hoop at section is as the origin of coordinates, and well flash radial direction direction is x-axis positive direction, turns clockwise 90 ° for y-axis positive direction along x-axis positive direction, sets up coordinate system；In drilling process, the anglec of rotation of the inside and outside eccentric hoop of sensor constantly detection after eccentric hoop inner ring and the synthesis of eccentric hoop outer shroud displacement vector compared with setting value, needs adjustment if there is deviation；
When inner and outer ring is individually rotated, main shaft can be drawn in Y and the center displacement curve of Z-direction, when inner and outer ring is rotated simultaneously, so that inner and outer ring phase difference is 180 ° as an example, main shaft Y and the displacement curve of Z-direction as formed by being rotated inner and outer ring respectively can be drawn, is spindle eccentricity displacement resultant vector by two Curves compilations；
2）The decomposition of eccentric motion resultant displacement
In drilling process, center displacement vector is determined according to required build angle rate, then it is broken down into the displacement of eccentric hoop inner ring and eccentric hoop outer shroud, finally it is decomposed into the anglec of rotation of eccentric hoop inner ring and eccentric hoop outer shroud, when the displacement vector of eccentric hoop inner ring and the formation of eccentric hoop outer shroud keeps constant, then instrument is crept into forward according to certain build angle rate；
3）Movement locus optimizes
Using overcoat center A as origin, rectangular coordinate system X-Y is set up, show that outer shroud endoporus central motion equation of locus is： 
；The setting alignment of shafts needs to go to C points, connects 2 points of A, C, does straight line AC perpendicular bisector, hands over outer shroud endoporus centrode circle in 2 points of B and D, then when outer shroud endoporus center goes to B and D 2, then by rotating inner ring, the alignment of shafts can be made to reach C points；
（3）, high build angle rate borehole trace control tool testing and control project
Ground monitoring system calculates analysis mode center, the lower leaflet member of instruction by data acquisition transmission unit, ground and constituted；Underground measurement and control unit detects that pipe nipple, information transfer pipe nipple, MWD controllers and High Temperature Lithium Cell group are constituted by sensor, control pipe nipple, tool-face；Eccentric hoop outer corner measurement refers to the measurement of eccentric hoop inner ring and the eccentric hoop outer shroud anglec of rotation, and the tool face azimuth set according to ground monitoring system and displacement modulus value, decomposition computation go out the relative rotation angle of eccentric hoop inner ring and eccentric hoop outer shroud；The value deposit control unit for the expection eccentric hoop corner for being passed ground monitoring system down by control pipe nipple, by the adhesive for controlling electromagnetic clutch, realizing the relative rotation of eccentric hoop makes main shaft bending carry out deflecting, when there is deviation in the angle and predetermined value that detect, using deviation as control parameter, control electromagnetic clutch realizes control eccentric hoop corner；Tool-face detection pipe nipple is made up of triaxial accelerometer module, detects that pipe nipple detects the spatial attitude of instrument by tool-face, is detected that pipe nipple measures the angle of actual direction and target direction by tool-face, is easy to compensating approach, reduces error；
Tool-face instruction and angle of bend instruction are sent in downhole controller through downgoing communication device by ground monitoring system, the eccentric hoop inner ring measured and eccentric hoop outer shroud position sensor signal are transferred in controller and carry out computing simultaneously, operation result is transferred in ground monitoring device by communicating terminal together with the MWD hole deviations measured and azimuth information and monitored.
Present invention beneficial effect compared with prior art is：
The high build-up rate well track control method is to detect eccentric hoop angle by controller unit and when predetermined value has deviation, pass through real time control algorithms, the adhesive of electromagnetic clutch is controlled, realizes the rotation of interior, eccentric hoop outer shroud to bend main shaft, reaches the purpose of deflecting.It is not to be oriented to by offset bit, but realize that the effective of drill axis leads control by control drill stem buckling feature, build angle rate is determined in itself by instrument, do not influenceed by drilling formation lithology, effect is obvious in soft formation and heterogeneity stratum, the guide digging of the TRAJECTORY CONTROLs of various wells such as straight well, directional well, ultradeep well, extended reach well, ultra-thin oil reservoir horizontal well, long range horizontal well, multi-branched well and various bad grounds can be applied to, is fully able to meet the requirement of the severe development situation of current oil reservoir.
Brief description of the drawings
Fig. 1 is the structural representation for the eccentric stiffener that high build-up rate well track control method is used；
Fig. 2 is the observing and controlling block diagram of high build-up rate well track control method；
Fig. 3 is oriented to the block diagram of control algolithm for the well track based on resolution of vectors；
Fig. 4 is the structural representation of high build angle rate borehole trace control tool；
Fig. 5 is the schematic diagram that spindle eccentricity displacement is formed；
Fig. 6 is the schematic diagram of the drilling rod bias α angular displacements of former borehole axis and new borehole axis；
The central motion track schematic diagram of Fig. 7 eccentric hoops inner ring and eccentric hoop outer shroud；
Fig. 8 is the block diagram of high build angle rate borehole trace control tool TT＆C system.
In figure：1, eccentric hoop inner ring, 2, eccentric hoop outer shroud, 3, housing, 4, main shaft, 5, upper sealing, 6, battery short section, 7, electromagnetic clutch, 8, deceleration device, 9 eccentric stiffeners, 10, dynamic sealing, 11, sensor, 12, standpipe, 13, controller, 14, drilling rod, 15, centralizer, 16, mwd system, 17, high build angle rate borehole trace control tool, 18, drill bit, 19, former borehole axis, 20, well, 21, overcoat, 22, new borehole axis, 23, cantilever bearings, 24, ball bearing, 25, spindle center movement locus, 26, outer shroud central motion track, 27, maximum eccentricity, 28, derrick.
Embodiment
The high build-up rate well track control method includes a rotary steerable tool and the control method to the rotary steerable tool, the rotary steerable tool includes eccentric stiffener 9 and the deceleration device 8, electromagnetic clutch 7, sensor 11 and the controller 13 that are connected with eccentric stiffener 9, described eccentric stiffener 9 is made up of eccentric hoop inner ring 1 and eccentric hoop outer shroud 2, eccentric hoop inner ring 1 is nested in inside the endoporus of eccentric hoop outer shroud 2, and main shaft 4 is nested in inside the endoporus of eccentric hoop inner ring 1.The guiding deflecting of the high build angle rate hole trajectory control relies primarily on the eccentric hoop inner ring 1 of eccentric stiffener 9 and the aggregate motion of eccentric hoop outer shroud 2 to realize that three dimensions is crept at any angle, and the signal of the center displacement of main shaft 4 formation is as shown in Figure 5.Eccentric stiffener 9 is the core of the bias unit in high build angle rate borehole trace control tool, the deflecting of instrument realization any direction in spatial dimension can be made by the eccentric hoop inner ring 1 and rotating against for eccentric hoop outer shroud 2 of eccentric stiffener 9, its operation principle is as shown in Figure 1.Needle bearing in eccentric hoop is standard component, and therefore, the length of eccentric hoop depends primarily on the selection of needle bearing.
Center of the outer wall center of circle of eccentric hoop outer shroud 2 all the time with the overcoat 21 of high build angle rate borehole trace control tool is concentric, and the endoporus center of eccentric hoop outer shroud 2 is exactly its pivot, its endoporus center and one e of outer wall circle center error distance；Meanwhile, the outer wall center of circle of eccentric hoop inner ring 1 is concentric with the endoporus center of eccentric hoop outer shroud 2, and the endoporus center of eccentric hoop inner ring 1 is exactly its pivot, its endoporus center and the outer wall center of circle also one e of deviation distance.
When eccentric hoop inner ring 1 is remained stationary as, and eccentric hoop outer shroud 2 is when individually rotating, and main shaft 4 then rotates using the center of instrument overcoat 21 as the center of circle, by radius of e, then the biasing range of drill bit is the anchor ring in a space；When eccentric hoop outer shroud 2 is remained stationary as, and eccentric hoop inner ring 1 is when individually rotating, and main shaft 4 then rotates using the outer wall center of eccentric hoop inner ring 1 as the center of circle, by radius of e, and the biasing range of drill bit is then the anchor ring in another space.And when eccentric hoop inner ring 1 and eccentric hoop outer shroud 2 rotate together, the outer wall center of circle of eccentric hoop inner ring 1 is constantly changing position, so as to realize that drill bit can carry out stepless deflection deflecting in a spatial dimension.
The high build-up rate well track control method is described in detail below by embodiment
1st, tool face azimuth and eccentric hoop position angle control principle
The Vector modulation of the position angle and tool-face angle of eccentric hoop inner ring 1 and eccentric hoop outer shroud 2 is as shown in fig. 7, wherein：
For tool face azimuth,
For outer shroud position angle,
For endocyclic position angle,
With
Respectively outer shroud, the vector value of inner ring,For
With
The resultant displacement vector synthesized according to parallelogram principle, high build angle rate borehole trace control tool produces bias mainly due to the generation of resultant displacement, and it controls the eccentric direction of tool spindle 4 and the size of offset.
Dead-center position：Instrument eccentric hoop outer shroud 2 in assembling is upward compared with webbing, and eccentric hoop inner ring 1 is downward compared with webbing, now
With
Size is identical, in the opposite direction, and the resultant displacement of synthesis is 0, and main shaft is in non-eccentric state.By above researching and analysing and can obtain to what guide eccentric displacement vector was decomposed：
Wherein
For the position angle of eccentric hoop outer shroud 2,
For the position angle of eccentric hoop inner ring 1,For resultant displacement vector, for the eccentric throw of this tool design parameter, i.e. inner and outer ring
, obtained so as to simplification：
The eccentric hoop of eccentric hoop inner ring 1 is in original state A（Non- eccentric state-vector
With
Size is identical, in the opposite direction）When, eccentric hoop outer shroud 2 is 0 °, and eccentric hoop inner ring 1 is 180 °；In state B location, the angle of eccentric hoop outer shroud 2 calculated by formula (4-2) is
, the angle of eccentric hoop inner ring 1 is
.When going to state B by state A, then eccentric hoop outer shroud 2 control rotate angle be（-0°）, eccentric hoop inner ring 1 control rotate angle be（
- 180 °, if negative value, add 360 °）.Inside and outside eccentric hoop position angle ralation method is incorporated into software, you can monitoring in real time and control are carried out to the position angle of eccentric hoop inner ring 1 and eccentric hoop outer shroud 2.
2nd, the calculating of center displacement
（1）The guiding synthesis of eccentric motion
Well center where using eccentric hoop at section is as the origin of coordinates, and well flash radial direction direction (in terms of from well head to shaft bottom) is x-axis positive direction, is turned clockwise 90 ° along x-axis positive direction（Right-hand rule）For y-axis positive direction, coordinate system is set up.If by top of well center O points, the webbing of eccentric hoop outer shroud 2 be end formed displacement vector be
.By top of central point of hole in eccentric hoop outer shroud 2, the webbing of eccentric hoop inner ring 1 be end formed displacement vector be
, eccentric hoop inner ring 1 and eccentric hoop outer shroud is 2-in-1 is into displacement vector
.When
Overlapped with x-axis and direction and x-axis it is positive it is consistent,
During with x-axis coincidence and direction positive opposite with x-axis, main-shaft axis is coaxial with instrument, and now instrument is that, without bias state, it is original state to take inside and outside ring status now.If
、
、
It is respectively with the positive angle of x-axis
,
,
（Clockwise for just), if eccentric hoop inner ring 1 and eccentric hoop outer shroud 2 are rotated clockwise, the anglec of rotation of eccentric hoop outer shroud 2 is
, the anglec of rotation of eccentric hoop inner ring 1 be 180 °+
, and eccentric hoop inner ring 1 and the resultant vector of eccentric hoop outer shroud 2 are：
（2-1）
Resolution of vectors to x-axis and y-axis are had：
Turning to vector form is：
Calculate：
In drilling process, sensor 11 can constantly detect the anglec of rotation of eccentric hoop inner ring 1 and eccentric hoop outer shroud 2, and after eccentric hoop inner ring 1 and the synthesis of the displacement vector of eccentric hoop outer shroud 2 compared with setting value, adjustment is needed if there is deviation.
When eccentric hoop inner ring 1 and eccentric hoop outer shroud 2 are individually rotated, main shaft can be drawn in Y and the center displacement curve of Z-direction, when eccentric hoop inner ring 1 and eccentric hoop outer shroud 2 are rotated, so that eccentric hoop inner ring 1 and the phase of eccentric hoop outer shroud 2 difference are 180 ° as an example, main shaft 4 Y and the displacement curve of Z-direction as formed by being rotated eccentric hoop inner ring 1 and eccentric hoop outer shroud 2 respectively can be drawn, is the center displacement resultant vector of main shaft 4 by two Curves compilations.
（2）The decomposition of eccentric motion resultant displacement
High build angle rate borehole trace control tool is in drilling well, and center displacement is to influence a key factor of build angle rate.In drilling process, center displacement vector is determined according to required build angle rate, then it is broken down into the displacement of eccentric hoop inner ring 1 and eccentric hoop outer shroud 2, finally it is decomposed into the anglec of rotation of eccentric hoop inner ring 1 and eccentric hoop outer shroud 2, when the displacement vector of eccentric hoop inner ring 1 and the formation of eccentric hoop outer shroud 2 keeps constant, it is possible to allow high build angle rate borehole trace control tool 17 to be crept into forward according to certain build angle rate.
When given eccentric hoop displacement resultant vector
Afterwards, its modulus value and angle is all determined therewith, and eccentric hoop displacement resultant vector
Given needs determined according to build angle rate with high build angle rate borehole trace control tool 17.Using the well center at the place section of lower end ball bearing 24 as the origin of coordinates, well flash radial direction direction (in terms of from well head to shaft bottom) is x-axis positive direction, is turned clockwise 90 ° along x-axis positive direction（Right-hand rule）For y-axis positive direction, coordinate system is set up.Eccentric hoop displacement resultant vector can be calculated by the axis of drill bit 18 and the angle of the high axis of build angle rate borehole trace control tool 17
Modulus value, and the angle of drill axis and the high axis of build angle rate borehole trace control tool 17
It can be calculated and obtained by given build angle rate, then
With
Relational expression be：
Wherein：For the distance of upper bearing (metal) to eccentric hoop, mm；
For the distance of lower bearing to eccentric hoop, mm；
For the distance between two bearings,
, mm；
For the angle of drill axis and tool axis,
For eccentric hoop displacement resultant vector
Modulus value, mm.
Therefore calculated by given build angle rate
, by（3-5）Formula can calculate eccentric hoop displacement resultant vectorModulus value.
And eccentric hoop displacement resultant vector
Direction can be determined by the tool face azimuth of given high build angle rate borehole trace control tool 17, ensure that an initial line for eccentric hoop displacement resultant vector is consistent with an initial line for the tool face azimuth of high build angle rate borehole trace control tool 17, when the overcoat 21 of high build angle rate borehole trace control tool 17 does not rotate, the tool-face direction of given high build angle rate borehole trace control tool 17 is eccentric hoop displacement resultant vector
Direction, when the overcoat 21 of high build angle rate borehole trace control tool 17 rotates, then eccentric hoop displacement resultant vector
Direction need the angle that is rotated according to the tool-face direction of high build angle rate borehole trace control tool 17 with overcoat 21 to determine.
Therefore, it is that can determine that eccentric hoop displacement resultant vector by given build angle rate and tool face azimuth
Modulus value and direction.Pass through（2-2）Formula and（2-3）Formula can be seen that,
With
Under known case, 2 unknown numbers are determined by 2 equations, solving equations can be obtained
With
There are two groups of solutions, i.e.,：
Given eccentric hoop displacement resultant vector, there are two groups of solutions in the angle for calculating correspondence eccentric hoop inner ring 1 and the rotation of eccentric hoop outer shroud 2, guarantee to reach target point within the most short time, then need to accept or reject this two groups of solutions, this is accomplished by depending on the initial position according to target point and eccentric hoop inner ring 1 and eccentric hoop outer shroud 2, therefore also needs to optimize the movement locus of eccentric hoop inner ring 1 and eccentric hoop outer shroud 2.
（3）Movement locus optimizing research
The endoporus central motion track of eccentric hoop outer shroud 2 is that, using A points as the center of circle, using e as the circle of radius, eccentric hoop inner ring 1 and the central motion track of eccentric hoop outer shroud 2 are as shown in Figure 7.Center A using the overcoat 21 of high build angle rate borehole trace control tool 17 sets up rectangular coordinate system X-Y as origin, show that the endoporus central motion equation of locus of eccentric hoop outer shroud 2 is：.Assuming that the center of main shaft 4 needs to go to C points, connect 2 points of A, C, do straight line AC perpendicular bisector, the endoporus centrode circle of eccentric hoop outer shroud 2 is handed in 2 points of B and D, that is, when the endoporus center of eccentric hoop outer shroud 2 goes to B and D 2, then by rotating eccentric hoop inner ring 1, the center of main shaft 4 can be made to reach C points, namely there are two kinds of solutions.
Herein by taking B points as an example, then the central motion track of main shaft 4 is, using B points as the center of circle, using e as the circle of radius, to connect A and B, draw straight line AB：, drawn with reference to outer shroud endoporus central motion equation of locus：
, two solutions have been obtained, choice of the two solutions can be accepted or rejected according to the rolling target point C of main shaft 4 coordinate, the two points and distances of C points are asked respectively, if apart from for e, the point is the center of circle justified of movement locus of main shaft 4.
Take herein
, i.e. B points position is drawn by the endoporus central motion equation of locus of eccentric hoop outer shroud 2：, so that the coordinate for obtaining B points is：, then the central motion equation of locus of main shaft 4 be：
If the endoporus center initial point of eccentric hoop outer shroud 2 is（
）, the point is connected with origin of coordinates A, if the straight slope is
.If the center initial point of main shaft 4 is（）, the point is connected with origin of coordinates A, if the straight slope is
.The target location coordinate value of main shaft 4 is combined（2-7）Formula can draw 2 k values, be set to
,（
It is also a kind of solution）.
If the forward direction of drilling rod 14 is positive direction, for eccentric hoop outer shroud 2, it can obtain respectivelyWith
Between angle：
Wherein arctanx span between 0 ~ 180 °, if
It is worth just, then to rotate according to positive direction
Angle；If
It is negative to be worth, then is rotated according to positive direction
Angle.Compare
,
Between size, if being all on the occasion of the less angle of value；If being all negative value, take absolute value larger angle；If one positive one is negative, value is positive angle.
For eccentric hoop inner ring 1, if straight line AC slope is
, then
With
Angle be：
Wherein arctanx span between 0 ~ 180 °, ifIt is worth just, then to rotate according to positive direction
Angle；If
It is negative to be worth, then is rotated according to positive directionAngle.
3rd, high build angle rate borehole trace control tool control program
High build angle rate borehole trace control tool testing and control project is as shown in fig. 7, ground monitoring system mainly calculates analysis mode center by data acquisition transmission unit, ground, instructs lower leaflet member to constitute.Underground measurement and control unit is main to detect that pipe nipple, information transfer pipe nipple, MWD controllers and High Temperature Lithium Cell group etc. are constituted by eccentric angular measurement and control pipe nipple, tool-face.Wherein eccentric hoop outer corner measurement refers to the measurement of the anglec of rotation of eccentric hoop inner ring 1, the tool face azimuth set according to ground monitoring system and displacement modulus value, decomposition computation goes out the relative rotation angle of eccentric hoop inner ring 1 and eccentric hoop outer shroud 2, realize to be accurately controlled and be dependent firstly on accurate measurement, be i.e. the Detection ＆ Controling of eccentric hoop corner are closely bound up；Control pipe nipple part is the pith for completing DH eccentric center ring corner closed-loop control, the value deposit control unit for the expection eccentric hoop corner that control pipe nipple passes down ground monitoring system, by the adhesive for controlling electromagnetic clutch 8, the relative rotation of eccentric hoop is realized to bend main shaft 4, reach the purpose of deflecting, when the angle and predetermined value that detect have deviation, using deviation as control parameter, control electromagnetic clutch 8 controls the purpose of eccentric hoop corner to realize；The tool-face detection pipe nipple of high build angle rate borehole trace control tool 17 is made up of triaxial accelerometer module, mainly detect the spatial attitude of high build angle rate borehole trace control tool 17, in drilling process, the overcoat 21 of high build angle rate borehole trace control tool 17 can be produced unavoidably to be rotated to cause the deviation on direction, detect that pipe nipple measures the angle of actual direction and target direction by the tool-face of high build angle rate borehole trace control tool 17, beneficial to compensating approach, reduce error, realize the accurate drilling of high build angle rate borehole trace control tool 17.
The tool-face instruction and angle of bend instruction of high build angle rate borehole trace control tool 17 are sent in downhole controller 13 by engineer by ground monitoring system through downgoing communication device, the eccentric hoop inner ring 1 measured and the position sensor signal of eccentric hoop outer shroud 2 are transferred in controller 13 and carry out computing simultaneously, and operation result is transferred to monitoring in ground monitoring device by communicating terminal together with hole deviation and azimuth information that MWD controllers are measured.If to change well track again, the tool-face instruction for changing the angle of bend of transmission main shaft 4 and high build angle rate borehole trace control tool 17 is sent by ground, it is sent in biasing mechanism and is performed via communicating terminal by controller 13, so both-way communication passage is set up on ground and underground, realizes intelligent steering.
The above is presently preferred embodiments of the present invention, the example above illustrates that the substance not to the present invention makees any formal limitation, any simple modification or deformation that person of an ordinary skill in the technical field has been made after this specification has been read according to the technical spirit of the present invention to above embodiment, and the Equivalent embodiments of equivalent variations are changed or are modified to possibly also with the technology contents of the disclosure above, in the range of still falling within technical solution of the present invention, without departing from the spirit and scope of the invention.
Claims (1)
1. a kind of high build-up rate well track control method, it includes a rotary steerable tool and the control method to the rotary steerable tool, it is characterised in that：The rotary steerable tool includes eccentric stiffener（9）And and eccentric stiffener（9）The deceleration device being connected（8）, electromagnetic clutch（7）, sensor（11）And controller（13）, described eccentric stiffener（9）By eccentric hoop inner ring（1）With eccentric hoop outer shroud（2）Composition, eccentric hoop inner ring（1）It is nested in eccentric hoop outer shroud（2）Inside endoporus, main shaft（4）It is nested in eccentric hoop inner ring（1）Endoporus inside, pass through eccentric hoop inner ring（1）With eccentric hoop outer shroud（2）Rotate against make rotary steerable tool realize in spatial dimension any direction deflecting；
The described control method to rotary steerable tool comprises the following steps：
（1）, tool face azimuth and eccentric hoop position angle control
Dead-center position：Instrument outer shroud in assembling（2）Compared with webbing upwards, inner ring（1）Compared with webbing downwards, the resultant displacement of synthesis is zero, and main shaft is in non-eccentric state, eccentric hoop inner ring（1）With eccentric hoop outer shroud（2）In original state, eccentric hoop outer shroud（2）For 0 °, eccentric hoop inner ring（1）For 180 °；By eccentric hoop inner ring（1）With eccentric hoop outer shroud（2）Position angle ralation method be incorporated into software, you can to eccentric stiffener（9）Position angle carries out monitoring in real time and control；
（2）, center displacement calculating
1）The guiding synthesis of eccentric motion
Well center where using eccentric hoop at section is as the origin of coordinates, and well flash radial direction direction is x-axis positive direction, turns clockwise 90 ° for y-axis positive direction along x-axis positive direction, sets up coordinate system；In drilling process, the anglec of rotation of the inside and outside eccentric hoop of sensor constantly detection, by eccentric hoop inner ring（1）With eccentric hoop outer shroud（2）After displacement vector synthesis compared with setting value, adjustment is needed if there is deviation；
When inner and outer ring is individually rotated, main shaft can be drawn in Y and the center displacement curve of Z-direction, when inner and outer ring is rotated simultaneously, so that inner and outer ring phase difference is 180 ° as an example, main shaft Y and the displacement curve of Z-direction as formed by being rotated inner and outer ring respectively can be drawn, is spindle eccentricity displacement resultant vector by two Curves compilations；
2）The decomposition of eccentric motion resultant displacement
In drilling process, center displacement vector is determined according to required build angle rate, eccentric hoop inner ring is then broken down into（1）With eccentric hoop outer shroud（2）Displacement, be finally decomposed into eccentric hoop inner ring（1）With eccentric hoop outer shroud（2）The anglec of rotation, when eccentric hoop inner ring（1）With eccentric hoop outer shroud（2）When the displacement vector of formation keeps constant, then instrument is crept into forward according to certain build angle rate；
3）Movement locus optimizes
Using overcoat center A as origin, rectangular coordinate system X-Y is set up, show that outer shroud endoporus central motion equation of locus is： 
；Set main shaft（4）Center needs to go to C points, connects 2 points of A, C, does straight line AC perpendicular bisector, hands over eccentric hoop outer shroud（2）Endoporus centrode circle is in 2 points of B and D, then when eccentric hoop outer shroud（2）When endoporus center goes to B and D 2, then by rotating eccentric hoop inner ring（1）, main shaft can be made（4）Center reaches C points；
（3）, high build angle rate borehole trace control tool testing and control project
Ground monitoring system calculates analysis mode center, the lower leaflet member of instruction by data acquisition transmission unit, ground and constituted；Underground measurement and control unit detects that pipe nipple, information transfer pipe nipple, MWD controllers and High Temperature Lithium Cell group are constituted by sensor, control pipe nipple, tool-face；Eccentric hoop outer corner measurement refers to eccentric hoop inner ring（1）With eccentric hoop outer shroud（2）The measurement of the anglec of rotation, the tool face azimuth set according to ground monitoring system and displacement modulus value, decomposition computation go out eccentric hoop inner ring（1）With eccentric hoop outer shroud（2）Relative rotation angle；The value deposit control unit for the expection eccentric hoop corner for being passed ground monitoring system down by control pipe nipple, by controlling electromagnetic clutch（7）Adhesive, realizing the relative rotation of eccentric hoop makes main shaft（4）Bending carries out deflecting, when the angle and predetermined value that detect have deviation, using deviation as control parameter, controls electromagnetic clutch（7）Realize control eccentric hoop corner；Tool-face detection pipe nipple is made up of triaxial accelerometer module, detects that pipe nipple detects the spatial attitude of instrument by tool-face, is detected that pipe nipple measures the angle of actual direction and target direction by tool-face, is easy to compensating approach, reduces error；
Tool-face instruction and angle of bend instruction are sent in downhole controller through downgoing communication device by ground monitoring system, while by the eccentric hoop inner ring measured（1）With eccentric hoop outer shroud（2）Position sensor signal, which is transferred in controller, carries out computing, and operation result is transferred in ground monitoring device by communicating terminal together with the MWD hole deviations measured and azimuth information and monitored.
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