CN108798562B - Eccentric rotation guiding drilling tool - Google Patents
Eccentric rotation guiding drilling tool Download PDFInfo
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- CN108798562B CN108798562B CN201810665831.9A CN201810665831A CN108798562B CN 108798562 B CN108798562 B CN 108798562B CN 201810665831 A CN201810665831 A CN 201810665831A CN 108798562 B CN108798562 B CN 108798562B
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- 238000005553 drilling Methods 0.000 title claims abstract description 94
- 230000007246 mechanism Effects 0.000 claims abstract description 153
- 238000000034 method Methods 0.000 claims description 8
- 239000002002 slurry Substances 0.000 claims description 7
- 230000005611 electricity Effects 0.000 claims description 3
- 239000007921 spray Substances 0.000 claims description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 4
- 239000000463 material Substances 0.000 abstract description 3
- 239000003345 natural gas Substances 0.000 abstract description 2
- 239000003208 petroleum Substances 0.000 abstract description 2
- 230000002349 favourable effect Effects 0.000 abstract 1
- 238000004140 cleaning Methods 0.000 description 4
- 210000002105 tongue Anatomy 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
- E21B19/24—Guiding or centralising devices for drilling rods or pipes
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
Abstract
The invention relates to a drilling tool in the drilling field of petroleum, natural gas and the like, in particular to a deflection rotation guide drilling tool. Aiming at the problems: the existing rotary steering drilling tool has a complex structure, a plurality of internal cavities and is not compact. The scheme is characterized in that: the drilling machine comprises a main shaft, an inner eccentric cylinder, an outer eccentric cylinder, a locking mechanism A and a locking mechanism B, wherein the main shaft is fixedly connected with a drilling column upwards and a drill bit downwards. The inner eccentric cylinder is rotatably sleeved on the main shaft; the outer eccentric cylinder is rotatably sleeved on the inner eccentric cylinder; the locking mechanism A is arranged between the main shaft and the inner eccentric cylinder; the locking mechanism B is arranged between the inner eccentric cylinder and the outer eccentric cylinder. Has the advantages that: 1, pushing against a well wall by using two adjustable eccentric cylinders, and adjusting the direction of a drill bit to achieve the aim of guiding; 2 compact structure, interior cavity are few, are favorable to reducing the requirement to the material, improve the working life of the rotatory steering drilling tool that can incline.
Description
Technical Field
The invention relates to a drilling tool in the drilling field of petroleum, natural gas and the like, in particular to a deflection rotation guide drilling tool.
Background
In the prior art, rotary steering drilling tools mainly comprise a push type drilling tool and a directional drilling tool. The push-type rotary steering drilling tool is characterized in that three telescopic wing ribs are uniformly arranged on the periphery of the tool, and the three wing ribs can selectively push against a well wall in a set direction to cause the drill bit to deviate, so that the single-side cutting of the drill bit is increased, the control of the drilling direction of the drill bit is realized, and the purpose of steering is achieved; however, the volume, and in particular the radius, of the pilot drilling tool is limited, and the provision of three retractable ribs complicates its construction and requires a large internal cavity and high material requirements.
The directional rotary steerable drilling tool provides a steering effect by providing a non-uniform inclination angle to the drill bit with a built-in biasing mechanism. However, the tool has a complex structure, a plurality of movable parts, a large internal cavity and a not compact structure.
The rotary guiding drilling tool is simple in structure, few in inner cavity and compact in structure, and is needed.
Disclosure of Invention
The invention aims at the technical problems that: the existing rotary steering drilling tool has a complex structure, a plurality of internal cavities and is not compact.
The technical scheme adopted by the invention is as follows: the two adjustable eccentric cylinders can be used for enabling the eccentric rotary steering drilling tool to push against a side well wall in a settable mode, so that the drill bit is deflected, and the steering purpose is achieved.
The invention comprises the following technical characteristics: a biased rotary steering drilling tool comprises a main shaft, an inner eccentric cylinder, an outer eccentric cylinder, a locking mechanism A and a locking mechanism B, wherein the main shaft is fixedly connected with a drill string upwards and fixedly connected with a drill bit downwards and is a supporting body of the biased rotary steering drilling tool. The inner eccentric cylinder is rotatably sleeved on the main shaft; the outer eccentric cylinder is rotatably sleeved on the inner eccentric cylinder; the locking mechanism A is arranged between the main shaft and the inner eccentric cylinder and can lock the inner eccentric cylinder and the main shaft together; the locking mechanism B is arranged between the inner eccentric cylinder and the outer eccentric cylinder and can lock the outer eccentric cylinder and the inner eccentric cylinder together. According to the invention, the eccentric cylinder and the outer eccentric cylinder rotate relatively to drive the eccentrically-rotated steering drilling tool to protrude in a set direction to push against a well wall, so that the drill bit is deflected, thereby increasing the single-side cutting of the drill bit and realizing the deflecting in any direction.
In the present application, the term "setting" means setting and determination in advance.
Further, the minimum wall thickness of the wall of the inner eccentric cylinder is equal to that of the wall of the outer eccentric cylinder; the maximum wall thickness of the wall of the inner eccentric cylinder is equal to that of the wall of the outer eccentric cylinder; the distances from each point on the periphery of the deflectable rotary steering drilling tool to the axis of the main shaft are equal, so that the drilling is performed in a stable inclined mode. In addition, the distances from each point on the outer periphery of the eccentrically steerable drilling tool to the axis of the main shaft may be equal, but the structural strength is poor, only if the sum of the minimum wall thickness and the maximum wall thickness of the inner eccentric cylindrical wall is equal to the sum of the minimum wall thickness and the maximum wall thickness of the outer eccentric cylindrical wall.
Furthermore, the eccentric rotary steering drilling tool also comprises a circular sleeve, a locking mechanism C and a driving mechanism; the circular sleeve is rotatably sleeved on the outer eccentric cylinder; the locking mechanism C is arranged between the outer eccentric cylinder and the circular sleeve and can lock the circular sleeve and the outer eccentric cylinder together; the driving mechanism is arranged between the outer eccentric cylinder and the circular sleeve and can be controlled to drive the circular sleeve to rotate relative to the outer eccentric cylinder. In the deflecting drilling process, the deflectable rotary steering drilling tool may deviate from the set offset direction, and the deflectable rotary steering drilling tool can be maintained to always point to the set offset direction by driving the circular sleeve and the outer eccentric cylinder to rotate relatively.
Further, locking mechanism a, and/or locking mechanism B, and/or locking mechanism C may be a friction type locking mechanism; the friction type locking mechanism comprises a cavity, a thrust mechanism, a friction block and a friction surface; the thrust mechanism can move back and forth in the cavity to push the friction block connected with the thrust mechanism to extrude or separate from the friction surface, so that the locking or unlocking state is realized.
Further, the cavity of the locking mechanism A is arranged at the position of the maximum wall thickness in the inner eccentric cylinder, and the friction surface is arranged at the periphery of the corresponding position of the main shaft cylinder wall; the cavity of the locking mechanism B is arranged at the position of the maximum wall thickness in the outer eccentric cylinder, and the friction surface is arranged at the periphery of the position corresponding to the wall of the inner eccentric cylinder; the cavity of the locking mechanism C is arranged at the position of the maximum wall thickness of the cylinder wall of the outer eccentric cylinder, and the friction surface is arranged on the inner periphery of the corresponding position of the cylinder wall of the circular sleeve. The cavity is arranged at the position of the maximum wall thickness, which is beneficial to increasing the construction strength.
Further, the locking mechanism A and/or the locking mechanism B can also be a clamping type locking mechanism, and the clamping type locking mechanism comprises a cavity, a thrust mechanism, a movable clamping tongue and a clamping groove; the thrust mechanism can move back and forth in the cavity to push the movable clamping tongue connected with the thrust mechanism to be inserted into or pulled out of the clamping groove, so that the locking or unlocking state is realized.
Further, the cavity of the locking mechanism A is arranged at the position of the maximum wall thickness in the inner eccentric cylinder, and the clamping groove is arranged at the periphery of the corresponding position of the main shaft cylinder wall; the cavity of the locking mechanism B is arranged at the position of the maximum wall thickness in the outer eccentric cylinder, the clamping grooves are arranged at the periphery of the corresponding position of the cylinder wall of the inner eccentric cylinder, the number of the clamping grooves is two, and one clamping groove is arranged at the position of the maximum wall thickness of the cylinder wall of the inner eccentric cylinder and can be used for drilling in a deflecting state of a drill bit; the minimum wall thickness position of the wall of the inner eccentric cylinder is used for the drill bit to drill in a steady inclined state; the cavity is arranged at the position of the maximum wall thickness, which is beneficial to increasing the construction strength.
Further, the locking mechanism a is driven by electricity; the locking mechanism B is driven by electric power; the locking mechanism C is driven by electric power; the drive mechanism is driven using electricity.
For example, the power supply can be located on the drill string, and the main shaft, the inner eccentric cylinder, the outer eccentric cylinder and the round sleeve are provided with conductive slip rings to introduce current into the locking mechanism A, the locking mechanism B, the locking mechanism C and the driving mechanism; current can also be introduced into the locking mechanism A, the locking mechanism B, the locking mechanism C and the driving mechanism through wireless induction.
Further, the locking mechanism A is driven by slurry; the locking mechanism B is driven by mud; the locking mechanism C is driven by mud; the driving mechanism is driven by mud.
For example, a controllable opening is arranged on the main shaft, corresponding pipelines are arranged on the inner eccentric cylinder and the outer eccentric cylinder to controllably introduce slurry into the locking mechanism A, the locking mechanism B, the locking mechanism C and the driving mechanism, and a sealing device is arranged at the connecting position of the main shaft, the inner eccentric cylinder, the outer eccentric cylinder and the round sleeve and used for avoiding slurry loss.
Furthermore, a small hole is formed at the joint of the main shaft and the drill column, and the small hole can be controlled to spray out slurry; the joint of the main shaft and the drill bit is provided with a small hole which can spray out slurry in a controlled way; the cleaning device is used for cleaning the crack between the main shaft and the inner eccentric cylinder and between the main shaft and the outer eccentric cylinder, and rock debris is prevented from falling into the crack to clamp the inner eccentric cylinder and the outer eccentric cylinder.
In the present invention, necessary components, units or systems are provided where necessary according to the well-known technique in the engine field. For example, a power supply is provided on the drill string, a control system is provided on the drill string, bearings are provided where necessary, seals are provided where necessary, and inner and outer eccentric cylinder position detecting mechanisms are provided where necessary.
The invention has the following beneficial effects: 1) the two adjustable eccentric cylinders are used for adjustment, so that the deflection-rotation guiding drilling tool protrudes to push against a well wall, the direction of a drill bit is adjusted, and the guiding purpose is realized; 2) compared with the prior art that the wing ribs are used for pushing against the well wall, the circular sleeve has larger contact area with the well wall and stronger pushing force; 3) the structure is compact, the internal cavity is few, the requirement on materials is favorably reduced, and the service life of the eccentric rotary steering drilling tool is prolonged.
Drawings
FIG. 1 is a schematic diagram comparing a steady state and a deflecting state of a deflectable steerable drilling tool.
FIG. 2 is a schematic cross-sectional view of a deviated steerable drilling tool configuration in a steady-inclination state.
FIG. 3 is a schematic diagram of a deflectable rotary steerable drilling tool configuration in a whipstock configuration.
Fig. 4 is a schematic diagram of the principle of whiplash.
Fig. 5 is a sectional view of the locking mechanism a.
Fig. 6 is a sectional view of the locking mechanism B.
Fig. 7 is a schematic sectional view of the locking mechanism C.
FIG. 8 is a sectional view of the driving mechanism.
Fig. 9 is a schematic view of a friction type locking mechanism.
FIG. 10 is a schematic view of an engagement type locking mechanism.
In the figure, 1 can eccentrically rotate and guide a drilling tool, 2 drill bits, 3 drill strings, 4 well walls, 5 opposite direction well walls, 10 main shafts, 12 small holes, 20 inner eccentric cylinders, 30 outer eccentric cylinders, 40 round sleeves, 50/60 locking mechanisms, 52 comprise cavities, 54 thrust mechanisms, 56 friction blocks, 58 friction surfaces, 62 cavities, 64 thrust mechanisms, 66 movable clamping tongues, 68 clamping grooves and 70 driving mechanisms.
Detailed Description
It should be noted that, in the present invention, the technical features of the embodiments and the examples may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Preferred embodiments of the present invention will be described in further detail with reference to fig. 1 to 10.
As shown in fig. 1, a comparison of the configuration of the deflectable rotary steerable drilling tool 1 in a steady state versus a deviated state is shown; the upper left part is that the eccentric rotary steering drilling tool 1 is in a stable inclination state, and the eccentric rotary steering drilling tool 1, the drill bit 2 and the drill column 3 are on the same axis and cannot be pertinently pushed against the well wall 4; the lower right part is in a deflecting state of the deflectable rotary steering drilling tool 1, the deflectable rotary steering drilling tool 1 deviates from the axis of the drill bit 2 and the drill column 3, protrudes downwards and is set to be pushed downwards against the well wall 4, so that the unilateral cutting of the drill bit 2 on the well wall 4 is increased, the drilling direction of the drill bit 2 is controlled, and the steering purpose is achieved.
FIG. 2 is a cross-section of the steerable rotary steerable drilling tool 1 of FIG. 1 in a steady state; the minimum position of the cylinder wall of the inner eccentric cylinder 20 corresponds to the maximum position of the cylinder wall of the outer eccentric cylinder 30, the maximum position of the cylinder wall of the inner eccentric cylinder 20 corresponds to the minimum position of the cylinder wall of the outer eccentric cylinder 30, and the center of the circular sleeve 40 is superposed with the center of the main shaft 10; fig. 2 illustrates the eccentrically steerable drilling tool 1 of fig. 1 in a steady state, with the drill bit 2 and drill string 3 on the same axis as the eccentrically steerable drilling tool 1.
FIG. 3 is a cross-section of the deflectable rotary steerable drilling tool 1 through the axis of the spindle 10 in the whipstock configuration of FIG. 1; the minimum position of the cylinder wall of the inner eccentric cylinder 20 corresponds to the minimum position of the cylinder wall of the outer eccentric cylinder 30, the maximum position of the cylinder wall of the inner eccentric cylinder 20 corresponds to the maximum position of the cylinder wall of the outer eccentric cylinder 30, and the center of the circular sleeve 40 deviates from the center of the main shaft 10 and protrudes downwards; FIG. 3 illustrates the deviated steerable drilling tool 1 of FIG. 1 in a deviated configuration, pushing against the borehole wall 4 in a set direction; in fig. 3, the locking mechanism 50A is in an unlocked state for the inner eccentric cylinder 20 not rotating concomitantly when the spindle 10 is rotating drilling; the locking mechanism 50B is in a locking state, the outer eccentric cylinder 30 and the inner eccentric cylinder 20 are locked together, and the locking mechanism is used for maintaining the center of the circular sleeve 40 to deviate from the center of the main shaft 10 and keeping a set deflecting state; the locking mechanism 50C is in a locked state, and the outer eccentric cylinder 30 and the circular sleeve 40 are locked together, so that the pushing force of the biased rotary steerable drilling tool 1 is directed to the well wall 4 in a set direction.
In fig. 3, the connection between the main shaft 10 and the drill string 3 is provided with a small hole 12 for controlled ejection of mud; a small hole 12 is arranged at the joint of the main shaft 10 and the drill bit 2 and can be used for controllably spraying slurry; the cleaning device is used for cleaning the crack between the main shaft 10 and the inner eccentric cylinder 20 and the outer eccentric cylinder 30, and rock debris is prevented from falling into the crack to clamp the inner eccentric cylinder 20 and the outer eccentric cylinder 30.
As shown in fig. 4, the deviated and rotatable guiding drilling tool 1 is set to be protruded to the lower side, and pushed against the lower side well wall 4, so that the drill bit 2 is deviated to the upper side, i.e. the opposite direction well wall 5, to increase the single-side cutting of the drill bit 2 to the upper side, to realize the control of the drilling direction of the drill bit 2, and further to achieve the purpose of the upward deflecting.
As shown in fig. 5, which is a cross section a-a of fig. 3, the minimum position of the wall of the inner eccentric cylinder 20 corresponds to the minimum position of the wall of the outer eccentric cylinder 30, the maximum position of the wall of the inner eccentric cylinder 20 corresponds to the maximum position of the wall of the outer eccentric cylinder 30, and the center of the circular sleeve 40 is deviated from the center of the main shaft 10 and protrudes downward; the locking mechanism 50A is in an unlocked state for the inner eccentric cylinder 20 not to rotate concomitantly when the spindle 10 is rotated for drilling.
As shown in fig. 6, which is a section B-B of fig. 3, the minimum position of the wall of the inner eccentric cylinder 20 corresponds to the minimum position of the wall of the outer eccentric cylinder 30, the maximum position of the wall of the inner eccentric cylinder 20 corresponds to the maximum position of the wall of the outer eccentric cylinder 30, and the center of the circular sleeve 40 is deviated from the center of the main shaft 10 and protrudes downward; the locking mechanism 50B is in a locked state, and the outer eccentric cylinder 30 and the inner eccentric cylinder 20 are locked together to maintain the center of the circular sleeve 40 to be deviated from the center of the main shaft 10, thereby maintaining the set deflecting state.
As shown in fig. 7, which is a cross section C-C of fig. 3, the minimum position of the wall of the inner eccentric cylinder 20 corresponds to the minimum position of the wall of the outer eccentric cylinder 30, the maximum position of the wall of the inner eccentric cylinder 20 corresponds to the maximum position of the wall of the outer eccentric cylinder 30, and the center of the circular sleeve 40 is deviated from the center of the main shaft 10 and protrudes downward; the locking mechanism 50C is in a locked state, and the circular sleeve 40 and the outer eccentric cylinder 30 are locked together, so that the pushing force of the biased rotary steerable drilling tool 1 is directed to the well wall 4 in a set direction.
As shown in fig. 8, which is a cross-section D-D of fig. 3, the minimum position of the wall of the inner eccentric cylinder 20 corresponds to the minimum position of the wall of the outer eccentric cylinder 30, the maximum position of the wall of the inner eccentric cylinder 20 corresponds to the maximum position of the wall of the outer eccentric cylinder 30, and the center of the circular sleeve 40 is offset from the center of the main shaft 10 and protrudes downward. The driving mechanism 70 is positioned between the outer eccentric cylinder 30 and the circular sleeve 40 and can be controlled to drive the circular sleeve 40 and the outer eccentric cylinder 30 to rotate relatively; in actual drilling and deflecting, when the eccentric rotary steerable drilling tool 1 deviates from the set pushing direction, the locking mechanism 50C is temporarily unlocked, and the driving mechanism 70 drives the outer eccentric cylinder 30 and the circular sleeve 40 to rotate relatively, so that the pushing force of the eccentric rotary steerable drilling tool 1 always points to the well wall 4 in the set direction.
As shown in fig. 9, the locking mechanism 50A, the locking mechanism 50B, and the locking mechanism 50C may be a friction-type locking mechanism 50; the friction type locking mechanism 50 comprises a cavity 52, a thrust mechanism 54, a friction block 56 and a friction surface 58; the pushing mechanism 54 can move back and forth in the cavity 52 to push the friction block 56 connected with the pushing mechanism to press or separate from the friction surface 58, so as to realize a locking or unlocking state.
As shown in fig. 10, the locking mechanism 60A, the locking mechanism 60B may be an engagement type locking mechanism 60; the clamping type locking mechanism 60 comprises a cavity 62, a thrust mechanism 64, a movable clamping tongue 66 and a clamping groove 68; the pushing mechanism 64 can move back and forth in the cavity 62 to push the movable latch 66 connected with the pushing mechanism to be inserted into or pulled out of the slot 68 for realizing a locking or unlocking state.
The invention also provides a method of steering a biasable rotary steerable drilling tool 1. Including a steady angle drill guide method, including the following steps, as shown in fig. 2.
Step a1, preparation phase.
Stopping drilling, lifting the drill bit 2 half meter away from the bottom of the well, so that the locking mechanism 50A is in a locking state, and the inner eccentric cylinder 20 can rotate along with the main shaft 10; the locking mechanism 50B is in an unlocked state, and the outer eccentric cylinder 30 and the inner eccentric cylinder 20 can rotate relatively; the locking mechanism 50C is in a locked state, and the outer eccentric circle is fixed with the circular sleeve 40, and the circular sleeve 40 can be kept still because the well wall 4 contacts and rubs with the circular sleeve 40.
Step a2, the deflectable rotary steerable drilling tool 1 is adjusted so that the center of the circular sleeve 40 coincides with the center of the main shaft 10.
The main shaft 10 is rotated, the inner eccentric cylinder 20 rotates along with the main shaft 10 until the minimum position of the cylinder wall of the inner eccentric cylinder 20 corresponds to the maximum position of the cylinder wall of the outer eccentric cylinder 30, the maximum position of the cylinder wall of the inner eccentric cylinder 20 corresponds to the minimum position of the cylinder wall of the outer eccentric cylinder 30, the locking mechanism 50A is unlocked, the locking mechanism 50B is locked, the locking mechanism 50C is unlocked, and the main shaft 10 stops rotating, as shown in fig. 2. At this time, the center of the circular sleeve 40 coincides with the center of the main shaft 10, the deviated rotary steerable drilling tool 1 does not protrude in a specific direction, and then the drill bit 2 can drill stably. In addition, in steady drilling, the locking mechanism 50A can be locked, the locking mechanism 50C can be locked, and the center of the circular sleeve 40 can be kept to be overlapped with the center of the main shaft 10.
In step a2, by appropriately providing the lock mechanism 50A, the lock mechanism 50B, and the lock mechanism 50C, the drive mechanism 70 rotates the outer eccentric cylinder 30 so that the minimum position of the cylinder wall of the outer eccentric cylinder 30 corresponds to the maximum position of the cylinder wall of the inner eccentric cylinder 20, and the center of the circular sleeve 40 can be aligned with the center of the main shaft 10.
The steering method of the deflectable rotary steerable drilling tool 1 comprises a whip drilling steering method comprising the following steps, as shown in fig. 3, 4, 5, 6, 7, 8.
Step B1, preparation phase.
Stopping drilling, lifting the drill bit 2 half meter away from the bottom of the well, so that the locking mechanism 50A is in a locking state, and the inner eccentric cylinder 20 can rotate along with the main shaft 10; the locking mechanism 50B is in an unlocked state, and the outer eccentric cylinder 30 and the inner eccentric cylinder 20 can rotate relatively; the locking mechanism 50C is in a locked state, and the outer eccentric circle is fixed with the circular sleeve 40, and the circular sleeve 40 can be kept still because the well wall 4 contacts and rubs with the circular sleeve 40.
And step B2, adjusting the eccentric rotary steering drilling tool 1 to make the center of the circular sleeve 40 deviate from the center of the main shaft 10, wherein the convex direction of the eccentric rotary steering drilling tool 1 points to the well wall 4 to be pushed, namely, the eccentric rotary steering drilling tool 1 points to the well wall 4 in the set direction.
Rotating the main shaft 10, rotating the inner eccentric cylinder 20 along with the main shaft 10 until the minimum position of the cylinder wall of the inner eccentric cylinder 20 corresponds to the minimum position of the cylinder wall of the outer eccentric cylinder 30, and the maximum position of the cylinder wall of the inner eccentric cylinder 20 corresponds to the maximum position of the cylinder wall of the outer eccentric cylinder 30, at this time, the center of the circular sleeve 40 deviates from the center of the main shaft 10, the eccentrically-rotatable guiding drilling tool 1 protrudes to one side, the locking mechanism 50B is locked, the locking mechanism 50C is unlocked, the main shaft 10 continues to rotate, the inner eccentric cylinder 20 and the outer eccentric cylinder 30 rotate along with the main shaft 10 until the protruding direction of the eccentrically-rotatable guiding drilling tool 1 points to the well wall 4 in the set direction, the locking mechanism 50A is unlocked, the locking mechanism 50C is locked, at this time, the eccentrically-rotatable guiding drilling tool 1 and the well wall 4 mutually push against each other, so that the drill bit 2 deviates to the, the drilling direction of the drill bit 2 is controlled, and the purpose of guiding is achieved.
In addition, the inner eccentric cylinder 20 rotates along with the main shaft 10 until the minimum position of the cylinder wall of the inner eccentric cylinder 20 corresponds to the minimum position of the cylinder wall of the outer eccentric cylinder 30, and the maximum position of the cylinder wall of the inner eccentric cylinder 20 corresponds to the maximum position of the cylinder wall of the outer eccentric cylinder 30, so that the center of the circular sleeve 40 is farthest away from the center of the main shaft 10, and the maximum deflecting capability of the deflectable rotary steering drilling tool 1 can be achieved. The corresponding positions of the inner eccentric cylinder 20 and the outer eccentric cylinder 30 can be adjusted to obtain different deflecting capacities smaller than the maximum deflecting capacity.
In step B3, the direction of projection of the deflectable steerable drilling tool 1 is maintained in a set direction during drilling.
Continuously detecting whether the deflectable rotary steering drilling tool 1 deviates from a set direction during drilling; when the protruding direction of the deviated rotary steerable drilling tool 1 deviates from the set direction, the driving mechanism 70 is started, the locking mechanism 50C is temporarily unlocked, the driving mechanism 70 drives the outer eccentric cylinder 30 and the circular sleeve 40 to rotate relatively, so that the protruding direction of the deviated rotary steerable drilling tool 1 returns to the set direction, the locking mechanism 50C is locked, and the driving mechanism 70 is closed.
During the deflecting drilling process, the deflectable rotary steerable drilling tool 1 may deviate from the set deviation direction, and by driving the circular sleeve 40 and the outer eccentric cylinder 30 to rotate relatively, the deflectable rotary steerable drilling tool 1 can be maintained to always point to the set deviation direction.
In addition, in step B2, by appropriately arranging the locking mechanism 50A, the locking mechanism 50B, and the locking mechanism 50C, the driving mechanism 70 drives the outer eccentric cylinder 30 to rotate so that the minimum position of the cylinder wall of the outer eccentric cylinder 30 corresponds to the minimum position of the cylinder wall of the inner eccentric cylinder 20, and then rotates the combination of the inner eccentric cylinder 20 and the outer eccentric cylinder 30, the well wall 4 that can be deflected to direct the projecting direction of the drilling tool 1 to the set direction can be achieved.
While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment and the components, but on the contrary, is intended to cover various modifications, combinations of features, equivalent arrangements, and equivalent components included within the spirit and scope of the appended claims. Further, the dimensions of features of each component appearing in the figures are not limiting, where the dimensions of each component may differ from the dimensions of the components depicted in the figures. Thus, it is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.
Claims (9)
1. A deflectable rotary steerable drilling tool, comprising: the device comprises a main shaft, an inner eccentric cylinder, an outer eccentric cylinder, a round sleeve, a locking mechanism A, a locking mechanism B, a locking mechanism C and a driving mechanism; the main shaft is upwards fixedly connected with a drill column and downwards fixedly connected with a drill bit;
the method is characterized in that:
the inner eccentric cylinder is rotatably sleeved on the main shaft; the outer eccentric cylinder is rotatably sleeved on the inner eccentric cylinder; the circular sleeve is rotatably sleeved on the outer eccentric cylinder; the locking mechanism A is arranged between the main shaft and the inner eccentric cylinder and can lock the inner eccentric cylinder and the main shaft together; the locking mechanism B is arranged between the inner eccentric cylinder and the outer eccentric cylinder and can lock the outer eccentric cylinder and the inner eccentric cylinder together; the locking mechanism C is arranged between the outer eccentric cylinder and the circular sleeve and can lock the circular sleeve and the outer eccentric cylinder together; the driving mechanism is arranged between the outer eccentric cylinder and the circular sleeve and can be controlled to drive the circular sleeve to rotate relative to the outer eccentric cylinder.
2. The deflectable rotary steerable drilling tool of claim 1, wherein: the minimum wall thickness of the wall of the inner eccentric cylinder is equal to that of the wall of the outer eccentric cylinder; and the maximum wall thickness of the inner eccentric cylinder wall is equal to that of the outer eccentric cylinder wall.
3. The deflectable rotary steerable drilling tool of claim 1, wherein: the locking mechanism A, and/or the locking mechanism B, and/or the locking mechanism C are friction type locking mechanisms; the friction type locking mechanism comprises a cavity, a thrust mechanism, a friction block and a friction surface; the thrust mechanism can move back and forth in the cavity to push the friction block connected with the thrust mechanism to extrude or separate from the friction surface.
4. The deflectable rotary steerable drilling tool of claim 3, wherein: the cavity of the locking mechanism A is arranged at the position of the maximum wall thickness in the inner eccentric cylinder, and the friction surface is arranged at the periphery of the corresponding position of the main shaft cylinder wall; the cavity of the locking mechanism B is arranged at the position of the maximum wall thickness in the outer eccentric cylinder, and the friction surface is arranged at the periphery of the position corresponding to the wall of the inner eccentric cylinder; the cavity of the locking mechanism C is arranged at the position of the maximum wall thickness of the cylinder wall of the outer eccentric cylinder, and the friction surface is arranged on the inner periphery of the corresponding position of the cylinder wall of the circular sleeve.
5. The deflectable rotary steerable drilling tool of claim 1, wherein: the locking mechanism A and/or the locking mechanism B is a clamping type locking mechanism; the clamping type locking mechanism comprises a cavity, a thrust mechanism, a movable clamping tongue and a clamping groove; the thrust mechanism can move back and forth in the cavity to push the movable clamping tongue connected with the thrust mechanism to be inserted into or pulled out of the clamping groove.
6. The deflectable rotary steerable drilling tool of claim 5, wherein: the cavity of the locking mechanism A is arranged at the position of the maximum wall thickness in the inner eccentric cylinder, and the clamping groove is arranged at the periphery of the corresponding position of the main shaft cylinder wall; the cavity of the locking mechanism B is arranged at the position of the maximum wall thickness in the outer eccentric cylinder, the clamping grooves are arranged at the periphery of the corresponding position of the cylinder wall of the inner eccentric cylinder, the number of the clamping grooves is two, and one clamping groove is arranged at the position of the maximum wall thickness of the cylinder wall of the inner eccentric cylinder; and the position of the minimum wall thickness of the wall of the inner eccentric cylinder is arranged.
7. The deflectable rotary steerable drilling tool of any of claims 3, 4, 5, 6, wherein: the locking mechanism A is driven by electric power; the locking mechanism B is driven by electric power; the locking mechanism C is driven by electric power; the drive mechanism is driven using electricity.
8. The deflectable rotary steerable drilling tool of any of claims 3, 4, 5, 6, wherein: the locking mechanism A is driven by mud; the locking mechanism B is driven by mud; the locking mechanism C is driven by mud; the driving mechanism is driven by mud.
9. The deflectable rotary steerable drilling tool of any of claims 1, 2, 3, 4, 5, 6, wherein: a small hole is formed at the joint of the main shaft and the drill stem, and mud can be sprayed out in a controlled manner; the joint of the main shaft and the drill bit is provided with a small hole which can spray out slurry in a controlled way.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810665831.9A CN108798562B (en) | 2018-06-26 | 2018-06-26 | Eccentric rotation guiding drilling tool |
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| DE3015752C2 (en) * | 1980-04-24 | 1985-04-25 | Salzgitter Maschinen Und Anlagen Ag, 3320 Salzgitter | Carriage for a rock drill |
| CN201221315Y (en) * | 2008-05-27 | 2009-04-15 | 王瑞奇 | Rotary guiding device of well drilling machine |
| CN106677703B (en) * | 2016-12-23 | 2019-03-26 | 西安石油大学 | A kind of dynamic guiding type rotary steering drilling tool eccentric stiffener |
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