CN85103611B - Sleeve-type drilling-direction changer - Google Patents

Abstract

The present invention relates to a multifunctional tool for effectively changing and controlling the azimuth angle and the deviation angle of a well bore of a well drilled directionally by a rotary disk. The relative swinging of a core shaft and a sleeve barrel provided with an upper tile and a lower tile is utilized to generate transverse force in a position adjacent to a drill bit to effectively control and change the azimuth angle and the deviation angle of a well bore. A dedicated sealing system is designed, so that tool failures caused by rock fragment impact, blockage, mud balling, etc. are avoided. The upper and the lower tiles can be replaced, so that the direction changing capability is enhanced, and the present invention has the combined functions of direction increase and decrease, deviation increase and decrease, etc. and the performance of improving efficiency and preventing deviation when a pendulum drill is used for drilling a well.

Description

Sleeve-type drilling-direction changer

The present invention relates to the oil rotating disk and bores the directed drilling field, is used for effectively control or changes the azimuth of well and the Multifucntional instrument of hole angle.

Along with oil, natural gas exploration, the needs of exploitation, especially sea and waters, the special requirement of the underground oil and gas exploration exploitation of zone, marsh and some accident well treatment technology etc., directed-drilling technique is growing, and the key problem in technology of directed drilling success or failure just is effective control and the change to the azimuth of the well of constantly creeping into and hole angle.

Through long-term practice, people have had the way of many successes for the control of hole deviation.For azimuthal effective control, up to the present, even in the world can be few in number for the technology of commercial Application, the specialist tools that can apply is not only seldom but also exist the various shortcomings that are difficult to overcome.

As " eccentric wedge ", deflecting or variable-azimuth amplitude are very little, need repeatedly hyposphene repeatedly, and directed repeatedly, the heavy operation of reaming could satisfy certain designing requirement, and this just seems for large-scale directed drilling engineering and has been not suitable for very much.

As " camber line whipstock ", if the borehole wall is irregular, instability or well oversize big (these just in the drilling engineering general phenomenon), drill bit will take place and can not creep into along the well bus in this, and track is spiral helicine abnormal results, not only this can not realize the technical requirements of orientation or variable-azimuth, but also can influence the carrying out of drilling well subsequent handling and the normal use of well.

And for example, also there is employing " flange joint formula diverter " to solve the engineering problem of directed drilling abroad, but this instrument, not only conditions down-hole is required high (smooth as the borehole wall, lithology is moderate, hole diameter is stable and suitable etc.), but also must be used with attached parts that help such as " taking over (stub boring quickly) ", " transit joint (reducing joint) ", " characteristic bearings ".This instrument itself is made up of " laying particular stress on pipe ", " flange joint up and down " again, and " the going up lower flange " of playing the variable-azimuth effect is subjected to the GRAVITY CONTROL and the influence of " laying particular stress on pipe " again, add " characteristic bearing " wearing and tearing and inefficacy easily again, so the success rate of this kind instrument is extremely insecure.It also is very uncertain that the technology of its variable-azimuth is renderd a service, and when hole angle was big, the effect of instrument was just more obvious.Hole angle hour, or the down-hole situation is when pausing complexity, and the instrument effect does not just guarantee.This has in fact just cut down the engineering significance of this instrument greatly.

Boring in the directed drilling variable-azimuth special tool field at rotating disk, is " Rebel Tool vane type variable-azimuth device " with the maximally related prior art of the present invention.This instrument not only is claimed as " the unique commercial instrument that is used to prevent or correct azimuth deviation " by " u.s. oilfield equipment complex sample " (this specialty has one of publication of prestige most), and is the instrument of many external confessed comparative maturities of expert.(see United States Patent Office 3092188 Patented June 4,1963, INTERPAS, P.O.BOX101, The Netherlands) critical piece of forming this instrument has: 1. have the body of tool of special-shaped groove cave, raceway groove, 2. two blades (blade, calvus) up and down; 3. power transmission shaft; 4. two secondary split bearings; 5. two secondary safe thrust bearings; 6. two pairs are held outboard bearings etc.The instrument total length does not wait from 10 Foot to 16 Foot by the different size of its diameter from 6 inch to 12 inch.Because this instrument theory structure exists serious deficiency, thereby instrument itself is with regard to the more intrinsic significant deficiency that is difficult to overcome.Since this instrument appearance that Here it is, use not basic reason place widely so far, conclude its shortcoming, following four aspects of outstanding behaviours:

1. transmission stiffness is poor.This is by the project organization of this instrument institute extremely.Be fixed on the power transmission shaft on the bearing, an active blade (blade) is adorned along the drilling tool rotary veer in the upper end, and the contrary drilling tool rotary veer in lower end adorns one by moving vane (lower blade), and it is the core that produces the direction of displacement effect that the Trinity is assisted moving mutually.And the internal diameter of tool housing and wall thickness have determined the power transmission shaft that is arranged in housing can not do greatlyyer, but the technical purpose of instrument requires to increase as much as possible the distance between the blade up and down again, this just must make main, passive interlobate transmission, is finished by slender axles.(as R＜`; ; 6-01`〉this instrument of type, the power transmission shaft diameter is 40 millimeters, the length of the installation site countershaft of blade is that 1560 millimeters-slenderness ratio is about 0.0256 up and down; R＜`; ; 12-01`〉this instrument of type, the diameter of power transmission shaft is 50 millimeters, the length of the installation site countershaft of blade is 3000 millimeters up and down, slenderness ratio is about 0.0167).Such slender axles can not have the transmission effect of the power (or merit) of high rigidity, and instrument is in the state turned round in when work, and when hole angle was big, the moment of torsion of power transmission shaft was also just bigger, and therefore the torsional deformation of the axle that produces also just increases thereupon.Undoubtedly, the synthesis result of these phenomenons-transmission stiffness difference just causes the practical effect of transmission mechanism to be lower than the ideal designs level out and away.Particularly requiring to finish simultaneously under the working condition of increasing hole angle and variable-azimuth, this kind instrument is just fully powerless.

2. sealing is poor.This instrument is without any seal member or guard block.Main drive disk assembly-power transmission shaft, up and down on blade, the body of tool with the special-shaped depression of blade combo etc., all expose, be immersed in the work mud, be subjected to the impact of drilling cuttings at any time, may be stagnated and mud drum by jam, sand at any time.If landwaste silt particle jam is (this point is inevitable in fact creeping into) between the depression of blade and body of tool, blade can't regular event, can't draw in by design and swing.Instrument has just become unnecessary " cylinder " that does not play any break-in effect.In order to address this problem, also the someone has carried out some locality improvement, as boring a little hydrophthalmia at place, body of tool blade cave, from then on mud is outwards ejected, and plays the effect that flushing is trapped in foreign matter between depression.But this can only wash out some and pile up silt particle or part mud drum, and can't resolve the stuck issue of landwaste at all.In addition,, drilling mud pressure is reduced because of shunting loss,, and influence the operate as normal and the application life of drill bit again not only bad for fractured rock owing to bored this two sand washing hydrophthalmias on the body of tool.More significant be when mud when the sand washing hydrophthalmia outwards sprays, blade will be subjected to an outside impulse force, reduce the inside gathering power of blade, this has just more influenced the usefulness of this instrument.

3. effective Area of bearing of upper and lower blade (active and passive blade) is less than normal, and instrument efficient is low.The structure of instrument is limit, blade can not be done too greatly, this just causes the blade and the borehole wall is that a strip contacts, the action of tool process, blade only takes place in a small range of angles, touches and hits the borehole wall, and the useful effect cycle of break-in power is very short, both be not take place fully under the utmost point ideal situation of the abominable phenomenon of front indication, the ability of the variable-azimuth of instrument also is limited.(find out according to the interrelated data of being announced, on average whenever creeping into 30 meters variable-azimuth angles only has about 1.5 °, a minimum practical result has only 0.5 °) simultaneously, just because effective Area of bearing of blade is little, also limited its range of application, when brill reached comparatively soft stratum, this instrument had not just prove effective.

4. the instrument materials being fabricated requires height, and manufacturing procedure is many, the manufacturing cost height of instrument.Only body of tool just needs: 1. elder generation processes eccentric slurry channel on a round steel post; 2. reprocess the special shape depression of ccontaining upper and lower blade; 3. reprocess the elongated slot of ccontaining elongated power transmission shaft; 4. reprocess four multiple machining processes such as fixing groove of ccontaining two groups of bearing supports.Moreover, the elongated power transmission shaft of the strong impact force of anti-strong moment of torsion and pulsating, exigent process technology level and frock level, exigent material level.

In order to solve above-mentioned all shortcomings, the present invention adopts the relative swing principle of sleeve and axle in mechanism, make sleeve produce lateral force at nearly drill bit place, promotes drill bit and produces the effect that increases the orientation or subtract the orientation.On mechanical foundation, though with prior art in state-of-the-art blade type diverter (blade type diverter) similar part is arranged, on structural principle and design philosophy, then have an outstanding characteristic and significantly progressive.

Structural concept of the present invention and operating principle are shown in accompanying drawing 1, accompanying drawing 2, accompanying drawing 3 and accompanying drawing 4.

Figure 1 shows that general assembly elevation of the present invention;

Figure 2 shows that general assembly sectional view of the present invention;

Figure 3 shows that the sectional view that increases azimuth mechanism of the present invention along Figure 1A-A line;

Figure 4 shows that the sectional view that subtracts azimuth mechanism of the present invention along Figure 1A-A line;

Fig. 5 A is the sectional drawing along the B-B line of Fig. 1 of the present invention;

Fig. 5 B is the stereogram of tile of the present invention;

Fig. 6 A is the sectional drawing along the C-C line of Fig. 1 of the present invention;

Fig. 6 B is the stereogram of the special-shaped little axle of the present invention.

The present invention-socket type diverter main parts size shown in Figure 1:

1. axle: be a hollow cylinder, its endoporus is a slurry channel, and the upper end connects with drilling assembly is conventional, and the lower end connects with the drill bit routine;

2. sleeve: be the tubular thin walled shell, keep certain radial clearance between its inwall and the axle;

3. special-shaped little axle: have upper and lower two.Two little axles are positioned at on the line of uniting as one, and it constitutes the revolute pair that sleeve is swung around axle with the bearing support that is fixed on the axle respectively;

4. bearing support: on axle, constitute above-mentioned revolute pair with axle with screw;

5. screw: can be standard component, be used for fixing little axle and bearing support;

6. end cover: upper and lower each one, by screw on axle;

7. go up tile (blade): make or horminess fastening gold bar block is inlayed on the surface by the material of steel or wear-resisting high-strength degree, with screw on sleeve;

8. descend tile (lower blade): make or horminess fastening gold bar block is inlayed on the surface by the material of steel or wear-resisting high-strength degree, with screw on sleeve;

From Fig. 1,2,3,4, can find out, sleeve 2. and axle 1. between, it is secondary to constitute a swing, promptly 2. sleeve is axle with axis 3-3,1. the phase center roller produces a kind of swing.Diverter is whole by " n " direction shown in Figure 1, rotates with drilling tool.When diverter is worked in inclined borehole, because the deadweight of drilling tool, 7. last tile forwards to and contacts with the following borehole wall and when telescoping, sleeve 2. promptly and axle swing between 1., sleeve that 7. tile locate and the gap between the axle are reduced, and sleeve and the gap between the axle that 8. tile is located increase, and the lateral movement of following tile will force drill bit to produce laterally offset, creep into well track thereby change, reach the purpose of break-in.

Figure 3 shows that and increase azimuth mechanism along A-A line sectional view among Fig. 1.So therefrom the present invention has variable-azimuth angle function as can be seen, so the design principle that controllability is arranged is renderd a service in its break-in.As shown in FIG., last tile 7., down tile 8., little axle 3., sleeve 2. with axle 1. by the assembly relation of design." angle is " θ ", and then corresponding " angle " with little axis 3-3 of last tile is " φ " promptly to descend tile and little axis 3-3.(size of two angles is according to determining by mode of occupation) is if certain is instantaneous, 7. last tile forwards the position of touching mutually with the following borehole wall to, 8. following tile touches mutually with the borehole wall in the left side owing to the increase of respective clearance and produces under the reaction force F, has 7. located generation effect on the reaction force F at last tile simultaneously.Be under the power F and make drill bit increase the main source of orientation action effect.Otherwise, as the relative position of upper and lower tile as shown in Figure 4 the time, be under the power F and make drill bit subtract the main source of orientation action effect.

Since sleeve 2. and axle must keep suitable gap between 1., diverter could operate as normal, so prevent that solid foreign materials from invading this gap has been exactly one of very outstanding technical essential.In order to solve this important sealing problem, the present invention has adopted at the sleeve upper/lower terminal end cover scheme 6. has been installed.The end cap that is about to design is screwed on axle, and the annular gap and the external world between axle and the sleeve are separated.In this tool work process, when 2. sleeve with axle 1. relative the swing takes place, relative slip also takes place between this end cover and the sleeve end face.This designs cleverly, and structurally, 6. end cover has not only played sealing function, but also has played the effect of bearing the axial force that is 2. produced by sleeve simultaneously.

Another outstanding progress of the present invention be tile 7., 8. and sleeve be dismountable assembly relation between 2., be to have adopted conventional screw mode to connect.This dismountable connecting mode, not only allow 7., 8. new tile was changed in heavy wear afterwards at tile, and more valuable be that the relative position that can allow upper and lower tile changes into and subtracts azimuth mechanism by increasing azimuth mechanism on same sleeve, otherwise also can change into and increase azimuth mechanism by subtracting azimuth mechanism.And the tile of existing technology is non-removable, and increasing the orientation device and subtracting the orientation device is two independent single-minded mechanisms.

Another the outstanding progressive little axle of control position and instrument manufacturing technology parameters such as angle theta, φ 3. that find expression in of the present invention can make same instrument have multi-functional technique effect.Fig. 3, little shaft centre line position shown in Figure 4 on the angular bisector of upper and lower tile angle, like this since lever arm of force equate, F down and last two power of F also be akin at numerical value.As the relative position of little shaft centre line is done certain adjustment, then F down and the variation that numerically will take place to concern by a certain percentage on the F.If particularly design θ smallerly, so, under the condition on the same numerical value F, just can produce under the F of bigger numerical, thereby produce bigger break-in power.

In Fig. 3 and structure shown in Figure 4, last tile 7. and the angle of following tile between 8. be 90 °, effect as temporary negligible friction, can find out that the side borehole wall acts on down under the tile counter-force F 8. by stressed in qualitative, can only change the azimuth, the following borehole wall acts on the effect that increasing hole angle then can take place on the tile counter-force F 7..In addition, because diverter is installed on the lower end of pendulum assembly, so when 7. last tile left down the borehole wall, the pendulum force of whole drilling tool then the drop angle effect can take place.Like this, the drop angle effect of increasing hole angle on the F and pendulum assembly is cancelled each other, and the result can make and thisly may keep hole angle constant by the engineering requirement when being combined in break-in, or hole angle is constantly increased and constantly reduces.

If make tile up and down 7., the angle between 8. is not 90 °, has the component of an increasing hole angle or drop angle under the counter-force F that then descends tile 8. to go up yet.In fact, when this angle during less than 90 °, the component of an increasing hole angle can take place down in F, makes diverter in the double action that has increasing hole angle and variable-azimuth in varying degrees.

If make tile up and down 7., the angle between 8. is during greater than 90 °, 8. counter-force F is next that a drop angle component takes place for following tile, makes diverter in the double action that has drop angle and variable-azimuth in varying degrees.Under opposite extreme situations, this angle can be designed to 180 °, then this instrument no longer has the effect of variable-azimuth, and only has drop angle and anti-tiltedly effect.During this special structure can be used for beating directly, but and called after " anti-oblique device ".

Create at the structural center of comprehensive the invention described above is to use sleeve as tile ground Force transmission parts up and down, its main purpose is: provide a kind of employing the sleeve of tile up and down and the relative swing of axle are housed, make nearly bit head produce corresponding lateral force, thus the strong instrument of power transmission rigidity of the multiple function of the azimuth of control and change well and hole angle.

For this reason, architectural feature of the present invention is:

1. on structure design, the tile design of wearing and tearing is easily become dismountable parts, and on the appropriate location of sleeve pre-drilled screw hole, this not only can change after tile wearing and tearing to a certain degree, and the relative position of tile up and down can be changed, this instrument is had concurrently increase the orientation and subtract the two kinds of different break-in functions in orientation;

2. structurally can change the angle of little shaft centre line and tile, make up and down tile has the different arm of forces when stressed, dwindle as the angle that will descend tile and little shaft centre line, then can make down tile produce bigger break-in power, make the break-in effect tool controllability of instrument.

3. changing the angle between two tiles up and down on the structure design, make this instrument have the double effects that changes azimuth and hole angle simultaneously.During specific design, as make angle, can obtain the double effects of increasing hole angle and break-in less than 90 °; As make angle greater than 90 °, can obtain the double effects of drop angle and break-in;

4. the angle between the tile just in time equals 180 ° making up and down on the structure design, and this instrument then becomes a kind of " anti-oblique device " that has certain additional drop angle power on the pendulum assembly basis, and this instrument can improve the rate of penetration of beating straight well;

5. on structure design, the upper-lower seal end cap is installed, make between axle and the sleeve the gap normally creep into and the process that makes a trip in isolated with the external world, thereby the instrument that can guarantee in use is in normal operating conditions always, avoided instrument owing to foreign matter is invaded the consequence that the gap is unfavorable for the break-in performance.

In addition, the present invention is in improvement and the modification made by certain technical requirements on the existing architecture basics on some machined parameters.The present invention is multi-functional tandem product,

In a word, the present invention compares with state-of-the-art " Bebel Tool blade (blade) formula diverter " in the prior art, except that possessing original all strong points, also has peculiar following 6 outstanding advantage itself:

1. this instrument is a transmission body of making upper and lower tile (blade, calvus) of the extremely strong sleeve of rigidity, improve the transmission efficiency of power (merit) significantly, solved the medium-term and long-term low and low root problem of application value of the efficient that produces owing to power transmission rigidity difference that exists of prior art;

2. this instrument has designed " sealing " system that is made up of parts such as upper and lower end covers, has effectively prevented the harmful impact and the phenomenons such as jam and mud drum of foreign matter such as silt particle, landwaste in the drilling process, has guaranteed the performance and the effectiveness of instrument.

3. the upper and lower tile of this instrument can be made different size according to different technical requirementss, has not only improved the break-in ability of instrument, and has enlarged the scope of application of instrument.And upper and lower tile is removably interconvertible, has not only prolonged the application life of tool body, and makes instrument have multifunctionality, and this is an outstanding development.

The convenient processing and manufacture of this instrument, easily row, cost are low.1. only need two rectangular grooves of processing on ready-made drill collar as the tool body axle, just finished substantially with ccontaining next group bearing support of going up.For another example the main transmission body sleeve of this instrument 2., material is the suitable ready-made ordinary casing of preferred dimension directly, processing also only needs to get final product boring certain screw hole by design with conventional method on the relevant position on the sleeve pipe.

5. this instrument also can have good break-in action effect in little low hole deviation corner well section about to 5 °, and " Bebel Tool diverter " both had been that a tangent condition has all been idealized when hole angle is below 10 °, can not use.

6. this instrument utilizes rotating disk to bore to carry out variable-azimuth, and this itself has the significant deficiency of curvature violent change point with regard to the wellbore trace that has overcome underground power drilling (as turbine brill, screw drill etc.).Again because this instrument does not need any ancillary service, with whole drilling assembly run-in synchronism, whenever rotate a circle once with regard to effective action, so be continuous, asymptotic to make drill bit finish variable-azimuth to creep into, so the directional well well track that is got out is the smoothed curve shape, avoid or reduce the appearance of " dog-leg district " (the abominable situation of change is turned in the sudden change that takes place in the drilling process).Outstanding superiority such as this just makes this instrument have drilled well bore quality height, and drilling efficiency height, drilling cost are low.

In view of the present invention has above-mentioned major advantage, but and the product seriation, existing processing and implementation scheme of only lifting wherein a kind of this instrument critical piece that is applicable to 95/8 o'clock drill bit is as follows:

Axle 1.-to select the API drill collar of 6 ready-made inch for use be that materials processing forms.

I, its length are as the criterion 2. rationally to cooperate with sleeve, to run well.(embodiment sleeve like this 2. length is 3000 millimeters, and axle 1. length is 4000 millimeters)

II, it up and down is processed into according to a conventional method with drill collar that is suitable for and drill bit and connects screw thread in two ends.

III, (2. can 1. do swing and be as the criterion) to be processed into suitable platform-like, and process two groups in order to fixed bearing block screw hole 4. around axle to guarantee sleeve in the relevant position, two ends of axis body.

IV, in the relevant position, two ends of axis body (above, lower seal end cap 6. design size is a certificate, is as the criterion to guarantee end cover effective work 6.) be processed into fixing seal end cap uniform screw 6., this embodiment is 3.

Sleeve 2.-select ready-made 7 for use _5/8The API sleeve pipe of inch is that materials processing forms.

I, on same design axis, two ends process respectively and can be screwed little axle one group of (3 pairs 6) screw 3. up and down.

II, process respectively at the sleeve body two ends group energy be screwed up and down tile 7., screw 8., so that 7. 8. assembling screw is corresponding with upper and lower tile, and can adjusts the tile installation site by design and be as the criterion.Because of 5. the selected screw of the present invention is standard body when processing this group screw, highly necessary standardization.2. and work between the 1. sealing of annular gap of axle after having determined the position of tile according to technical requirements and being screwed, all the other standby screws can install corresponding screw to guarantee that sleeve.

The upper and lower end face of III, sleeve body is cut flat with conventional machine-tooled method, to guarantee and end cover plane contact 6..

3. go up tile 7.-select for use the A35 steel to make.Shown in (not adopting the surface to inlay the carbide alloy design)-accompanying drawing 5.

I, Design of length are 360 millimeters, and the arc cornerite is not less than 90 °.With sleeve 2. be the concentric arc body, inside radius R ₁With 2. outer radius etc. of sleeve, outer radius R ₂Be R ₁Add 30 millimeters.Lead angle is done by the requirement of machine routine techniques in each edge.

2. one group of II, processing are uniform fixes in the corresponding screw-present embodiment of screw faciation that this tile uses and has processed 12 pairs altogether in the upper end with sleeve, and 24 screws are on tile.

III, this tile being installed on sleeve the time, also adopted one group of corresponding " a slice two holes " the locking pad of formula in two above-mentioned holes.

4. descend tile 8.-select for use the A35 steel to make.Shown in (not adopting performance to inlay the carbide alloy design)-accompanying drawing 5.

I, Design of length are 360 millimeters, and the arc cornerite is not more than 30 °.With the inside radius of the 2. concentric arc body of sleeve, outer radius respectively with last tile R 7. ₁R ₂Identical.Lead angle has been done by the requirement of machine routine techniques in each edge.

2. one group of II, processing are uniform fixes in the corresponding screw-present embodiment of screw faciation that this tile uses and has processed 8 pairs of 16 screws altogether on tile in the lower end with sleeve.

III, this tile being installed when 2. sleeve is gone up, also adopted and one group of corresponding " a slice two holes " the locking pad of formula in two above-mentioned holes.

5. upper and lower end cover 6.-be actually the thin body of an annular.Select common iron A3 machine requirement manufacturing routinely for use.

1. the internal diameter of I, end cap matches with axle, the external diameter of end cap must greater than sleeve 2. internal diameter and when sleeve swung to maximum displacement, end cap still sealed and is as the criterion.Be 152 millimeters in the end cap internal diameter R in the present embodiment, end cap external diameter R is 215 millimeters outward.

II, end cap are drilled with 3 uniform screws corresponding with axle radially, in order to use screw with end cap be fixed on axle 1. on.

6. special-shaped little axle 3.-select 45 steel manufacturings for use.(seeing accompanying drawing 6).

I, this little axle are to be used for stop sleeve 2. 1. to do to swing around shape with respect to axle.One end be fixed on the axle bed that holds that 1. axle go up and 1. constitute revolute pair.30 millimeters of in the present embodiment little shaft diameters.

The other end of II, little axle be special-shaped end, is processed into the 2. curved surface that coincide of inwall of one side and sleeve, and one side is the plane, and its height is swung around the work of axle and is as the criterion not influence sleeve.In the present embodiment, its height is 30 millimeters.The total length of little axle is not limit, and is as the criterion to guarantee enough working strengths.Its length is in the present embodiment: circular shaft end length is 40 millimeters (note: bearing support 4. with it must be corresponding).Special-shaped end length is 150 millimeters.Between circular shaft end and the special-shaped end 10 millimeters processing changeover portion is arranged, need in order in the machining process.Special-shaped end is wide 70 millimeters, and with three pairs 6 in sleeve auger shell hole, relevant position place 2. (this hole count only limits in the present embodiment,, can design at random in this instrument is made in other specification) be used for little axle 3. overall fixed sleeve 2. on.

Above critical piece and necessary component-assembled are become the test of going into the well of the integral body of this instrument as shown in Figure 1, can obtain tangible break-in effect.As in the experiment of certain No. 755 well in oil field district, selecting well depth to creep into 1031 meters from 890 meters is a test well section, creep into 141 meters altogether, hole angle from 9 ° change to 16 ° 10 ', the azimuth changes to 227 ° from 235 °, on average whenever creep into 30 meters, the hole angle variable quantity just be 1 ° 35 ' and the azimuthal variation amount just be 1 ° 40 '.And take a sample test wherein 890 meters to 930 these sections, then whenever creep into 30 meters just have the hole angle variable quantity be 1 ° 10 ', the azimuthal variation amount is the outstanding effect up to 3 ° 30 unexpectedly, these technical characteristics, all be all prior art can not be than U.S..

Here supplemental instruction is a bit again: so-called sealing problem among the present invention, it is not all impervious isolation completely of air in the universal, and be meant the situation that still has fluid to a certain degree to pass, the bigger foreign matters such as landwaste of particle fully by " sealing " the sleeve of this instrument 2. outside, guaranteed that instrument can not take place because of the phenomenon that the impact that is subjected to foreign matter and jam do not play the break-in effect.

Claims (7)

1, a kind of body of tool that comprises, transmission mechanism is the break-in instrument that carries out directed drilling with hitting the tile that touches borehole wall generation break-in power, the invention is characterized in: have two ends respectively with drilling assembly, the conventional axle (1) that connects of drill bit, inwall and axle (1) keep the drive socket (2) of radial clearance, the a pair of bearing support (4) that is fixed on the axle (1), a pair of and bearing support (4) constitute swing secondary stop sleeve (2) and make sleeve (2) that (3) are a pair of is loaded on respectively on the sleeve (2) around special-shaped little of axle (1) swing, following two ends external surface and being distributed in, on the little down axle coaxial line both sides, following tile (7), (8), a pair of being loaded on the sleeve (2), following two ends and be fixed on end cover (6) on the axle (1).

2, according to the break-in instrument of claim 1 directed drilling, it is characterized in that, on lower seal end cap (6) and the sleeve (2), two annular end faces become plane contact down, and the outer rim radius of end cap is greater than the internal diameter of sleeve (2) and the maximum displacement sum in sleeve (2) course of normal operation.

3, according to the break-in instrument of claim 1 directed drilling, it is characterized in that around the two ends of the sleeve (2) of the transmission of axle (1) swing be drilled with can be by technical requirements fixing on, following tile (7), a group screw of (8).

4, according to the break-in instrument of claim 1 directed drilling, it is characterized in that by wear-resisting, the tile (7) that high-intensity material is made, (8) (or harder bar block is inlayed on the surface) be drilled with one group with sleeve (2) the two ends screw group fixing threaded hole of the corresponding use of certain part wherein;

5,, it is characterized in that the angle of upper and lower tile (7), (8) is mounted to less than 90 ° according to the break-in instrument of claim 1,4 directed drillings;

6,, it is characterized in that the angle of upper and lower tile (7), (8) is mounted to greater than 90 ° according to the break-in instrument of claim 1,4 directed drillings;

7, according to the break-in instrument of claim 1,4 directed drillings, it is characterized in that: the angle of tile (7), (8) is mounted to 180 °.

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