CN103556945B - High build-up rate well track control method - Google Patents
High build-up rate well track control method Download PDFInfo
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- CN103556945B CN103556945B CN201310510905.9A CN201310510905A CN103556945B CN 103556945 B CN103556945 B CN 103556945B CN 201310510905 A CN201310510905 A CN 201310510905A CN 103556945 B CN103556945 B CN 103556945B
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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, being the needs in order to adapt to complex structural well drillng operation and a new and high technology of inventing, is research emphasis and the developing direction of modern society's height build angle rate drilling well.High build-up rate well track control method, for carrying out steerable drilling under the condition of drill string full rotation, not lead by biased drill bit, but by a set of bias unit between non rotating overcoat and transmission main shaft, transmission main shaft is biased, thus provide an inclination angle inconsistent with borehole axis for drill bit, produce guide effect.Use high build-up rate well track control method, can when carrying out drillng operation, do not need frequently to make a trip and just can realize three dimensional hole trajectory control, and have that rate of penetration is high, well cleaning effect is good, hole trajectory control precision and flexibility is high, the number of times that makes a trip is few, hole quality is high, safety advantages of higher, be suitable for the needs of the special well development situations such as China's complex reservoir middle-deep well, ultradeep well, ultra-thin oil-reservoir water horizontal well and unconventionaloil pool well.
The control Technology for Borehole Trajectory of present application, develops commercially produced product with the Geo-Pilot of the PowerDrive SRD of the AutoTrak RCLS of Baker HughesInteq company, Schlumberger Anadrill company and Halliburton Sperry-sun company for representative.AutoTrak RCLS system is mainly by controlling the hydraulic coupling size (3 support ribs and are supported in the borehole wall with different hydraulic coupling respectively) of 3 uniform support ribs of non rotating overcoat circumference, thus control size and Orientation with joint efforts, control well track by such mode, realized controlling by the bi-directional communication system (ground monitoring computer, decode system and drilling fluid pulse signal generation apparatus) of ground and down-hole and LWD (well logging during).But the shortcomings such as displacement working method, static overcoat, miniaturization capability that this control mode is brought are poor, complex structure all affect the development of this system.The mode that PowerDrive system adopts is also similar with AutoTrak RCLS, is realized controlling by bidirectional information communication system under MWD measurement-while-drilling system, surface well and ground-based computer monitoring system.But equally because its rib block caused is flexible frequent, cause shock and impact to drilling tool and the borehole wall, the element such as hydraulic cylinder and distributing valve adopts mud as working media, and component abrasion severity, extending tool life is an outstanding problem.
Summary of the invention
The object of the invention is to, there is provided a kind of and can be applied to straight well, directional well, ultradeep well, extended reach well, ultra-thin oil-reservoir water horizontal well, long distance horizontal well, multi-branched well etc. the TRAJECTORY CONTROL of various well and the guide digging of various bad ground, when needing to change drilling direction in drilling process, corresponding control instruction is sent to bias unit, transmission main shaft is bent, main-shaft axis skew original direction, complete direction controlling, drill bit creeps into along new drilling direction; That to overcome existing high build-up rate well track control method short for tool life, the high build-up rate well track control method of the high deficiency of cost of production.
The present invention realizes above-mentioned purpose by the following technical solutions:
A kind of high build-up rate well track control method, comprise a rotary steerable tool and the control method to this rotary steerable tool, it is characterized in that: the deceleration device that described rotary steerable tool comprises eccentric stiffener and is connected with eccentric stiffener, electromagnetic clutch, sensor and controller, 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, rotary steerable tool is made to realize the deflecting of any direction in spatial dimension by eccentric hoop inner ring and the relative rotation of eccentric hoop outer shroud,
Described comprises the following steps the control method of rotary steerable tool:
(1), tool face azimuth and eccentric hoop position angle control
Dead-center position: instrument when assembling outer shroud comparatively webbing upwards, inner ring comparatively webbing is downward, and the resultant displacement of synthesis is zero, and main shaft is in non-eccentric state, and eccentric hoop inner ring and eccentric hoop outer shroud are when 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 enrolled software, Real-Time Monitoring and control can be carried out to eccentric stiffener position angle;
(2), the calculating of center displacement
1) the guiding synthesis of eccentric motion
Using the well center of eccentric hoop place section as the origin of coordinates, the radial direction of well flash is x-axis positive direction, turns clockwise 90 ° for y-axis positive direction, set up coordinate system along x-axis positive direction; In drilling process, sensor constantly detects the anglec of rotation of inside and outside eccentric hoop, after eccentric hoop inner ring is synthesized with eccentric hoop outer shroud displacement vector compared with setting value, if there is deviation, needs adjustment;
When inner and outer ring rotates separately, the center displacement curve of main shaft in Y and Z-direction can be drawn, when inner and outer ring rotates simultaneously, it is 180 ° for inner and outer ring phase, main shaft can be drawn to be rotated by inner and outer ring respectively and the displacement curve of the Y formed and Z-direction, two Curves compilations are spindle eccentricity displacement resultant vector;
2) decomposition of eccentric motion resultant displacement
In drilling process, according to required build angle rate determination center displacement vector, then the displacement of eccentric hoop inner ring and eccentric hoop outer shroud is decomposed into, finally be decomposed into the anglec of rotation of eccentric hoop inner ring and eccentric hoop outer shroud, when the displacement vector that eccentric hoop inner ring and eccentric hoop outer shroud are formed remains unchanged, then instrument creeps into forward according to certain build angle rate;
3) movement locus optimization
With overcoat center A for initial point, set up rectangular coordinate system X-Y, show that outer shroud endoporus central motion equation of locus is:
; The setting alignment of shafts needs to forward C point to, connects A, C 2 point, does the perpendicular bisector of straight line AC, hands over outer shroud endoporus centrode circle in B and D two point, 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 point;
(3), the testing and control project of high build angle rate borehole trace control tool
Ground monitoring system is made up of leaflet unit under data acquisition transmission unit, ground computational analysis Simulation Center, instruction; Down-hole measurement and control unit is detected pipe nipple, information transmission pipe nipple, MWD controller and High Temperature Lithium Cell group formed 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 according to tool face azimuth and the displacement modulus value of the setting of ground monitoring system, decomposition computation goes out the relative rotation angle of eccentric hoop inner ring and eccentric hoop outer shroud; By controlling the value of the expection eccentric hoop corner that ground monitoring system passes down by pipe nipple stored in control unit, by controlling the adhesive of electromagnetic clutch, realize relatively rotating of eccentric hoop and make that main shaft is bending carries out deflecting, when there is deviation in the angle detected and predetermined value, using deviation as controling parameters, control electromagnetic clutch and realize controlling eccentric hoop corner; Tool-face detects pipe nipple and is made up of triaxial accelerometer module, is detected the spatial attitude of pipe nipple testing tool by tool-face, detects the angle that pipe nipple measures actual direction and target direction, is convenient to compensating approach, reduce error by tool-face;
By ground monitoring system, tool-face instruction and angle of bend instruction are sent in downhole controller through downgoing communication device, the eccentric hoop inner ring recorded and eccentric hoop outer shroud position sensor signal are transferred in controller simultaneously and carry out computing, operation result to be transferred in ground monitoring device with the hole deviation that MWD measures by communicating terminal together with azimuth information and to monitor.
The present invention's beneficial effect is compared with prior art:
This high build-up rate well track control method is when detecting that eccentric hoop angle and predetermined value exist deviation by controller unit, pass through real time control algorithms, control the adhesive of electromagnetic clutch, realize rotation that is interior, eccentric hoop outer shroud and main shaft is bent, reach the object of deflecting.Not lead by biased drill bit, but effectively lead control by what control that drill stem buckling feature realizes drill axis, build angle rate is determined by instrument itself, not by the impact of formation drilling lithology, successful in soft formation and heterogeneity stratum, straight well, directional well, ultradeep well, extended reach well, ultra-thin oil-reservoir water horizontal well, long distance horizontal well, multi-branched well etc. the TRAJECTORY CONTROL of various well and the guide digging of various bad ground can be applied to, the requirement of the severe development situation of current oil reservoir can be met completely.
Accompanying drawing explanation
Fig. 1 is the structural representation of the eccentric stiffener that high build-up rate well track control method uses;
Fig. 2 is the observing and controlling block diagram of high build-up rate well track control method;
Fig. 3 is the block diagram of the well track guiding control algolithm 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 eccentric α angular displacement of drilling rod of former borehole axis and new borehole axis;
The central motion track schematic diagram of Fig. 7 eccentric hoop 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, movable 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.
Detailed description of the invention
This high build-up rate well track control method comprises a rotary steerable tool and the control method to this rotary steerable tool, deceleration device 8, electromagnetic clutch 7, sensor 11 and controller 13 that described rotary steerable tool comprises eccentric stiffener 9 and is 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 eccentric hoop outer shroud 2 endoporus, and main shaft 4 is nested in inside the endoporus of eccentric hoop inner ring 1.The guiding deflecting of this high build angle rate hole trajectory control mainly relies on the eccentric hoop inner ring 1 of eccentric stiffener 9 and the aggregate motion of eccentric hoop outer shroud 2 to creep at any angle to realize three dimensions, and the signal that main shaft 4 center displacement is formed as shown in Figure 5.Eccentric stiffener 9 is cores of the bias unit in high build angle rate borehole trace control tool, instrument can be made to realize the deflecting of any direction in spatial dimension by the eccentric hoop inner ring 1 of eccentric stiffener 9 and the relative rotation of eccentric hoop outer shroud 2, its operating principle as shown in Figure 1.Needle bearing in eccentric hoop is standard component, and therefore, the length of eccentric hoop depends primarily on choosing of needle bearing.
The outer wall center of circle of eccentric hoop outer shroud 2 is concentric with the center of the overcoat 21 of high build angle rate borehole trace control tool all the time, and the endoporus center of eccentric hoop outer shroud 2 is exactly its center of rotation, the distance of its endoporus center and an outer wall circle center error e; 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 center of rotation, the distance of its an endoporus center and the outer wall center of circle also deviation e.
When eccentric hoop inner ring 1 keeps motionless, and when eccentric hoop outer shroud 2 rotates separately, 4, main shaft is the center of circle with the center of instrument overcoat 21, is that radius rotates with e, then the biasing range of drill bit is the anchor ring in a space; When eccentric hoop outer shroud 2 keeps motionless, and when eccentric hoop inner ring 1 rotates separately, 4, main shaft is the center of circle with the outer wall center of eccentric hoop inner ring 1, is that radius rotates with e, and the biasing range of drill bit is then the anchor ring in another space.And when eccentric hoop inner ring 1 rotates together with eccentric hoop outer shroud 2, the outer wall center of circle of eccentric hoop inner ring 1 is constantly changing position, thus realize drill bit and can carry out stepless deflection deflecting in a spatial dimension.
This high build-up rate well track control method is described in detail below by embodiment
1, tool face azimuth and eccentric hoop position angle control principle
The position angle of eccentric hoop inner ring 1 and eccentric hoop outer shroud 2 and the Vector modulation of tool-face angle as shown in Figure 7, wherein:
for tool face azimuth,
for outer shroud position angle,
for endocyclic position angle,
with
be respectively the vector value of outer shroud, inner ring,
for
with
according to the resultant displacement vector of parallelogram principle synthesis, high build angle rate borehole trace control tool mainly produces eccentric due to the generation of resultant displacement, which control the eccentric direction of tool spindle 4 and the size of side-play amount.
Dead-center position: instrument when assembling eccentric hoop outer shroud 2 comparatively webbing upwards, eccentric hoop inner ring 1 comparatively webbing is downward, now
with
size is identical, and direction is contrary, and the resultant displacement of synthesis is 0, and main shaft is in non-eccentric state.Researched and analysed can be obtained by what decompose guide eccentric displacement vector above:
Wherein
for eccentric hoop outer shroud 2 position angle,
for eccentric hoop inner ring 1 position angle,
for resultant displacement vector, for this tool design parameter, i.e. the eccentric throw of inner and outer ring
, thus can simplify and obtain:
Eccentric hoop inner ring 1 eccentric hoop is at the non-eccentric state-vector of original state A(
with
size is identical, and direction is contrary) time, eccentric hoop outer shroud 2 is 0 °, and eccentric hoop inner ring 1 is 180 °; When state B position, eccentric hoop outer shroud 2 angle calculated by formula (4-2) is
, eccentric hoop inner ring 1 angle is
.When forwarding state B to 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 be negative value, add 360 °).Inside and outside eccentric hoop position angle ralation method is enrolled software, Real-Time Monitoring and control can be carried out to the position angle of eccentric hoop inner ring 1 and eccentric hoop outer shroud 2.
2, the calculating of center displacement
(1) the guiding synthesis of eccentric motion
Using the well center of eccentric hoop place section as the origin of coordinates, the radial direction (from well head to shaft bottom) of well flash is x-axis positive direction, turn clockwise 90 ° (right-hand rules) for y-axis positive direction along x-axis positive direction, set up coordinate system.If with well center O point be top, the displacement vector that formed for end of eccentric hoop outer shroud 2 webbing is
.With central point of hole in eccentric hoop outer shroud 2 be top, the displacement vector that formed for end of eccentric hoop inner ring 1 webbing is
, eccentric hoop inner ring 1 and eccentric hoop outer shroud 2-in-1 become displacement vector be
.When
overlap with x-axis and direction and x-axis forward is consistent,
overlap with x-axis and direction is contrary with x-axis forward time, main-shaft axis is coaxial with instrument, and now instrument is without bias state, and the inner and outer ring state of getting now is original state.If
,
,
be respectively with x-axis forward angle
,
,
(clockwise direction is just), if eccentric hoop inner ring 1 and eccentric hoop outer shroud 2 rotate clockwise, then eccentric hoop outer shroud 2 anglec of rotation is
, eccentric hoop inner ring 1 anglec of rotation is 180 °+
, and the resultant vector of eccentric hoop inner ring 1 and eccentric hoop outer shroud 2 is:
（2-1）
Resolution of vectors is had to x-axis and y-axis:
Turning to vector form is:
Calculate:
In drilling process, sensor 11 constantly can detect the anglec of rotation of eccentric hoop inner ring 1 and eccentric hoop outer shroud 2, after eccentric hoop inner ring 1 is synthesized with eccentric hoop outer shroud 2 displacement vector compared with setting value, if there is deviation, needs adjustment.
When eccentric hoop inner ring 1 and eccentric hoop outer shroud 2 rotate separately, the center displacement curve of main shaft in Y and Z-direction can be drawn, when eccentric hoop inner ring 1 and eccentric hoop outer shroud 2 rotate, it is 180 ° for eccentric hoop inner ring 1 and eccentric hoop outer shroud 2 phase, the displacement curve of the Y that main shaft 4 is rotated by eccentric hoop inner ring 1 and eccentric hoop outer shroud 2 and formed respectively and Z-direction can be drawn, two Curves compilations are main shaft 4 center displacement resultant vector.
(2) decomposition of eccentric motion resultant displacement
High build angle rate borehole trace control tool is when drilling well, and center displacement is the key factor affecting build angle rate.In drilling process, center displacement vector to be determined according to required build angle rate, then the displacement of eccentric hoop inner ring 1 and eccentric hoop outer shroud 2 is decomposed into, finally be decomposed into the anglec of rotation of eccentric hoop inner ring 1 and eccentric hoop outer shroud 2, when the displacement vector that eccentric hoop inner ring 1 and eccentric hoop outer shroud 2 are formed remains unchanged, high build angle rate borehole trace control tool 17 just can be allowed to creep into forward according to certain build angle rate.
When given eccentric hoop displacement resultant vector
after, its modulus value and angle are determined all thereupon, and eccentric hoop displacement resultant vector
given needs determine according to build angle rate and high build angle rate borehole trace control tool 17.Using the well center of lower end ball bearing 24 place section as the origin of coordinates, the radial direction (from well head to shaft bottom) of well flash is x-axis positive direction, turn clockwise 90 ° (right-hand rules) for y-axis positive direction along x-axis positive direction, set up coordinate system.Eccentric hoop displacement resultant vector can be calculated by the axis of drill bit 18 and the angle of high build angle rate borehole trace control tool 17 axis
modulus value, and the angle of drill axis and high build angle rate borehole trace control tool 17 axis
can be calculated by given build angle rate, then
with
relational expression be:
Wherein:
for upper bearing (metal) is to the distance of eccentric hoop, mm;
for lower bearing is to the distance of 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
, eccentric hoop displacement resultant vector can be calculated by (3-5) formula
modulus 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, guarantee that an initial line of eccentric hoop displacement resultant vector is consistent with an initial line of 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 of rotating according to tool-face direction and the overcoat 21 of high build angle rate borehole trace control tool 17 to determine.
Therefore, eccentric hoop displacement resultant vector can be determined by given build angle rate and tool face azimuth
modulus value and direction.Can be found out by (2-2) formula and (2-3) formula,
with
under known case, determine 2 unknown numbers by 2 equations, solving equations can be obtained
with
there are two groups of solutions, that is:
Given eccentric hoop displacement resultant vector, there are two groups of solutions in the angle calculating corresponding eccentric hoop inner ring 1 and eccentric hoop outer shroud 2 rotation, guarantee to reach impact point within the shortest time, then need to accept or reject these two groups of solutions, this just needs the initial position according to impact point and eccentric hoop inner ring 1 and eccentric hoop outer shroud 2 and determines, and therefore also needs to be optimized the movement locus of eccentric hoop inner ring 1 and eccentric hoop outer shroud 2.
(3) movement locus optimizing research
Eccentric hoop outer shroud 2 endoporus central motion track is with A point for the center of circle, take e as the circle of radius, and eccentric hoop inner ring 1 and eccentric hoop outer shroud 2 central motion track are as shown in Figure 7.With the center A of the overcoat 21 of high build angle rate borehole trace control tool 17 for initial point, set up rectangular coordinate system X-Y, show that eccentric hoop outer shroud 2 endoporus central motion equation of locus is:
.Suppose that main shaft 4 center needs to forward C point to, connect A, C 2 point, do the perpendicular bisector of straight line AC, hand over eccentric hoop outer shroud 2 endoporus centrode circle in B and D two point, that is, when eccentric hoop outer shroud 2 endoporus center 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 point, also namely have two kinds of solutions.
Here for B point, then the central motion track of main shaft 4 is with B point for the center of circle, take e as the circle of radius, connects A and B, draws straight line AB:
, draw in conjunction with outer shroud endoporus central motion equation of locus:
, obtain two solutions, these two choices of separating can be accepted or rejected according to the coordinate of main shaft 4 rolling target point C, ask the distance of these two points and C point respectively, if distance is e, then this point is the center of circle of the movement locus circle of main shaft 4.
Here get
, i.e. B point position, is drawn by the endoporus central motion equation of locus of eccentric hoop outer shroud 2:
, thus the coordinate obtaining B point is:
, then the central motion equation of locus of main shaft 4 is:
（2-7）
if eccentric hoop outer shroud 2 endoporus center initial point be (
), this point is connected with origin of coordinates A, if this straight slope is
.If main shaft 4 center initial point be (
), this point is connected with origin of coordinates A, if this straight slope is
.Main shaft 4 target location coordinate value is combined (2-7) formula and can draw 2 k values, be set to
, (
also be a kind of solution).
If the forward direction of drilling rod 14 is positive direction, for eccentric hoop outer shroud 2, can obtain respectively
with
between angle
:
Wherein the span of arctanx is between 0 ~ 180 °, if
value is just, then rotate according to positive direction
angle; If
value is negative, then rotate according to positive direction
angle.Relatively
,
between size, if be all on the occasion of, the angle that value is less; If be all negative value, take absolute value larger angle; If one is positive one negative, value is positive angle.
For eccentric hoop inner ring 1, if the slope of straight line AC is
, then
with
angle be:
Wherein the span of arctanx is between 0 ~ 180 °, if
value is just, then rotate according to positive direction
angle; If
value is negative, then rotate according to positive direction
angle.
3, high build angle rate borehole trace control tool control program
As shown in Figure 7, ground monitoring system is primarily of leaflet unit composition under data acquisition transmission unit, ground computational analysis Simulation Center, instruction for high build angle rate borehole trace control tool testing and control project.Down-hole measurement and control unit measures primarily of eccentric angle and controls the composition such as pipe nipple, tool-face detection pipe nipple, information transmission pipe nipple, MWD controller and High Temperature Lithium Cell group.Wherein eccentric hoop outer corner measurement refers to the measurement of the anglec of rotation of eccentric hoop inner ring 1, according to tool face azimuth and the displacement modulus value of the setting of ground monitoring system, decomposition computation goes out the relative rotation angle of eccentric hoop inner ring 1 and eccentric hoop outer shroud 2, realize accurate control and first depend on accurate measurement, namely the Detection & Controling of eccentric hoop corner are closely bound up; Control the pith that pipe nipple part is eccentric hoop corner closed-loop control under completed well, control the value of the expection eccentric hoop corner that ground monitoring system passes down by pipe nipple stored in control unit, by controlling the adhesive of electromagnetic clutch 8, realize eccentric hoop relatively rotate main shaft 4 is bent, reach the object of deflecting, when the angle detected and predetermined value exist deviation, using deviation as controling parameters, control the object that electromagnetic clutch 8 realizes controlling eccentric hoop corner; The tool-face of high build angle rate borehole trace control tool 17 detects pipe nipple and 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 produce unavoidably and rotates thus cause the deviation on direction, the angle that pipe nipple measures actual direction and target direction is detected by the tool-face of high build angle rate borehole trace control tool 17, be beneficial to compensating approach, reduce error, achieve accurately creeping into of high build angle rate borehole trace control tool 17.
The tool-face instruction of high build angle rate borehole trace control tool 17 and angle of bend instruction are sent in downhole controller 13 through downgoing communication device by ground monitoring system by engineer, the eccentric hoop inner ring 1 recorded and eccentric hoop outer shroud 2 position sensor signal are transferred in controller 13 simultaneously and carry out computing, and operation result is transferred in ground monitoring device by the hole deviation that communicating terminal and MWD controller are measured together with azimuth information monitors.If again well track will be changed, the tool-face instruction changing transmission main shaft 4 angle of bend and high build angle rate borehole trace control tool 17 is sent by ground, to be sent in biasing mechanism via communicating terminal by controller 13 and to perform, both-way communication passage is set up in such ground and down-hole, achieves intelligent steering.
The above is preferred embodiment of the present invention, above-mentioned illustrating does not do any pro forma restriction to flesh and blood of the present invention, any simple modification that person of an ordinary skill in the technical field has done above detailed description of the invention according to technical spirit of the present invention after having read this manual or distortion, and the technology contents of above-mentioned announcement may be utilized to be changed or be modified to the Equivalent embodiments of equivalent variations, all still belong in the scope of technical solution of the present invention, and do not deviate from the spirit and scope of the invention.
Claims (1)
1. a high build-up rate well track control method, it comprises a rotary steerable tool and the control method to this rotary steerable tool, it is characterized in that: the deceleration device (8) that described rotary steerable tool comprises eccentric stiffener (9) and is connected with eccentric stiffener (9), electromagnetic clutch (7), sensor (11) and controller (13), 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 eccentric hoop outer shroud (2) endoporus, main shaft (4) is nested in inside the endoporus of eccentric hoop inner ring (1), rotary steerable tool is made to realize the deflecting of any direction in spatial dimension by eccentric hoop inner ring (1) and the relative rotation of eccentric hoop outer shroud (2),
Described comprises the following steps the control method of rotary steerable tool:
(1), tool face azimuth and eccentric hoop position angle control
Dead-center position: instrument when assembling outer shroud (2) comparatively webbing is upwards, comparatively webbing is downward for inner ring (1), the resultant displacement of synthesis is zero, main shaft is in non-eccentric state, eccentric hoop inner ring (1) and eccentric hoop outer shroud (2) are when original state, eccentric hoop outer shroud (2) is 0 °, and eccentric hoop inner ring (1) is 180 °; The position angle ralation method of eccentric hoop inner ring (1) and eccentric hoop outer shroud (2) is enrolled software, Real-Time Monitoring and control can be carried out to eccentric stiffener (9) position angle;
(2), the calculating of center displacement
1) the guiding synthesis of eccentric motion
Using the well center of eccentric hoop place section as the origin of coordinates, the radial direction of well flash is x-axis positive direction, turns clockwise 90 ° for y-axis positive direction, set up coordinate system along x-axis positive direction; In drilling process, sensor constantly detects the anglec of rotation of inside and outside eccentric hoop, after eccentric hoop inner ring (1) is synthesized with eccentric hoop outer shroud (2) displacement vector compared with setting value, if there is deviation, needs adjustment;
When inner and outer ring rotates separately, the center displacement curve of main shaft in Y and Z-direction can be drawn, when inner and outer ring rotates simultaneously, when inner and outer ring phase is 180 °, main shaft can be drawn to be rotated by inner and outer ring respectively and the displacement curve of the Y formed and Z-direction, two Curves compilations are spindle eccentricity displacement resultant vector;
2) decomposition of eccentric motion resultant displacement
In drilling process, according to required build angle rate determination center displacement vector, then the displacement of eccentric hoop inner ring (1) and eccentric hoop outer shroud (2) is decomposed into, finally be decomposed into the anglec of rotation of eccentric hoop inner ring (1) and eccentric hoop outer shroud (2), when the displacement vector that eccentric hoop inner ring (1) and eccentric hoop outer shroud (2) are formed remains unchanged, then instrument creeps into forward according to certain build angle rate;
3) movement locus optimization
With overcoat center A for initial point, set up rectangular coordinate system X-Y, show that outer shroud endoporus central motion equation of locus is:
; Setting main shaft (4) center needs to forward C point to, connect A, C 2 point, do the perpendicular bisector of straight line AC, hand over eccentric hoop outer shroud (2) endoporus centrode circle in B and D two point, then when eccentric hoop outer shroud (2) endoporus center goes to B and D 2, again by rotating eccentric hoop inner ring (1), main shaft (4) center can be made to reach C point;
(3), the testing and control project of high build angle rate borehole trace control tool
Ground monitoring system is made up of leaflet unit under data acquisition transmission unit, ground computational analysis Simulation Center, instruction; Down-hole measurement and control unit is detected pipe nipple, information transmission pipe nipple, MWD controller and High Temperature Lithium Cell group formed by sensor, control pipe nipple, tool-face; Eccentric hoop outer corner measurement refers to the measurement of eccentric hoop inner ring (1) and eccentric hoop outer shroud (2) anglec of rotation, according to tool face azimuth and the displacement modulus value of the setting of ground monitoring system, decomposition computation goes out the relative rotation angle of eccentric hoop inner ring (1) and eccentric hoop outer shroud (2); By controlling the value of the expection eccentric hoop corner that ground monitoring system passes down by pipe nipple stored in control unit, by controlling the adhesive of electromagnetic clutch (7), realize relatively rotating of eccentric hoop and make that main shaft (4) is bending carries out deflecting, when there is deviation in the angle detected and predetermined value, using deviation as controling parameters, control electromagnetic clutch (7) and realize controlling eccentric hoop corner; Tool-face detects pipe nipple and is made up of triaxial accelerometer module, is detected the spatial attitude of pipe nipple testing tool by tool-face, detects the angle that pipe nipple measures actual direction and target direction, is convenient to compensating approach, reduce error by tool-face;
By ground monitoring system, tool-face instruction and angle of bend instruction are sent in downhole controller through downgoing communication device, the eccentric hoop inner ring (1) recorded and eccentric hoop outer shroud (2) position sensor signal are transferred in controller simultaneously and carry out computing, operation result to be transferred in ground monitoring device with the hole deviation that MWD measures by communicating terminal together with azimuth information and to monitor.
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