CN110029936A - A kind of injection pressure formula bilayer drill string deviation control with drilling straight well drilling tool - Google Patents
A kind of injection pressure formula bilayer drill string deviation control with drilling straight well drilling tool Download PDFInfo
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- CN110029936A CN110029936A CN201910326135.XA CN201910326135A CN110029936A CN 110029936 A CN110029936 A CN 110029936A CN 201910326135 A CN201910326135 A CN 201910326135A CN 110029936 A CN110029936 A CN 110029936A
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- drill string
- assembly
- power transmission
- transmission cylinder
- piston
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B12/00—Accessories for drilling tools
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
- E21B17/07—Telescoping joints for varying drill string lengths; Shock absorbers
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B7/10—Correction of deflected boreholes
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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 present invention relates to a kind of injection pressure formula bilayer drill string deviation control with drilling straight well drilling tools, for beating straight well (or straight well section) in drilling engineering.Its structure specifically includes that power sub assembly, the double-deck drill string assembly, lower contact assembly and drill bit composition, the offer of power sub assembly make drill string inside the double-deck drill string be pressurized, the power of external drill string tension；The double-deck drill string assembly includes internal drill string and external drill string, is pressurized under the action of power sub assembly and lower contact assembly in internal drill string, external drill string tension state；Lower contact assembly connected double-layer drill string assembly and drill bit.External drill string is in tension state before not bearing bit pressure in the present invention, when bearing bit pressure, pulling force a part suffered by the double-deck drill string assembly is to offset bit pressure to the double-deck drill string assembly pressure applied, the double-deck drill string assembly is still within internal drill string and is pressurized, external drill string tension state, make drill string is unlikely to be bent, to realize deviation control with drilling straight well purpose.The present invention does not reduce bit pressure, and structure is relatively easy.
Description
Technical field
The invention belongs to a kind of oil and gas drilling tool fields, and in particular to a kind of injection pressure formula bilayer drill string is anti-oblique
Make straight drilling tool.
Background technique
With the continuous development of the exploration and development of oil and gas resource, such as stratigraphic structure that drilling well is encountered
The problems such as (such as high steeply inclined geological structure), formation hardness unevenness, drilling tool type and structure and drill assembly, cause in drilling well
In the process, institute's drilling straight-hole (or diameter segment) well track cannot achieve the desired purpose (completely vertical or full well hole deviation is 0 °).
In this way, " deviation control with drilling straight well " technology can reduce drilling cost to a certain extent, the wasting of resources is avoided.
Drilling cost caused by greatly to reduce because of hole deviation, anti-oblique and well straightening technology is an eternal research class
Topic.Traditional vertical drilling tool (such as packed hole assembly and pendulum assembly) is mainly using drilling tool lateral force as anti-oblique or drop angle
Power resources, to sacrifice bit pressure and drilling speed as cost, thus there are significant limitations.In addition, eccentric drilling device, off-axis drilling tool,
The vertical drilling tools such as flexible drill string, anti-pendulum assembly and steering drilling tool improve power auger though hole deviation can be controlled preferably
Speed, but not only structure is more complicated and still without enough abilities for resisting formation deflecting force for suchlike drill assembly.
The working principle of the existing vertical drilling tool of comprehensive analysis or be by sacrifice bit pressure and drilling speed it is anti-oblique to realize
Purpose or structure of downhole assembly are relatively complicated or because there are a large amount of electronic components, cannot bear high temperature and structure
It is relative complex, poor reliability.For relevant issues existing for existing vertical drilling tool, research and development structure is simple, does not sacrifice bit pressure
With drilling speed, comparatively reliable deviation control with drilling straight well drilling tool for pushing the development of drilling applications of far-reaching significance.
Summary of the invention
Present invention seek to address that sacrifice bit pressure and drilling speed, poor reliability, height cannot be born in existing vertical drilling tool
Temperature and complex structure and other problems, for oil/gas drilling field provide a kind of structure it is relatively easy, not to sacrifice bit pressure and drilling speed, can
The deviation control with drilling straight well drilling tool relatively high by property.
In order to achieve the above objectives, the technical solution adopted by the present invention is that: a kind of injection pressure formula bilayer drill string deviation control with drilling straight well drilling well
Tool, including power sub assembly, the double-deck drill string assembly, lower contact assembly and drill bit.Wherein power sub assembly includes above connecing
Head, center tap, position-limiting drum, central tube, ontology, piston ring, piston I, spring I, power transmission cylinder I, disc spring gasket ring, disc spring group, thrust
Bearing, power transmission cylinder II, piston II, spring II, spring strut；The double-deck drill string assembly includes sealing drum, internal drill string, external drill string；
Lower contact assembly includes joint body, spring strut.It is characterized by: the double-deck drill string deviation control with drilling straight well drilling tool is from top to bottom
Power pipe nipple assembly, the double-deck drill string assembly, lower contact assembly and drill bit are sequentially connected.
The invention has the advantages that: before injection pressure formula bilayer drill string deviation control with drilling straight well drilling tool bears bit pressure,
Under the power effect that power sub assembly provides, extruding is generated to the inside drill string in the double-deck drill string assembly, so that internal drill string
In pressured state；The internal external portion's drill string of drill string imposes counteractive pulling force, so that external drill string is in tension state.Injection pressure
When formula bilayer drill string deviation control with drilling straight well drilling tool bears bit pressure, external drill string is in preparatory suffered pulling force one in the double-deck drill string assembly
Divide to offset suffered bit pressure, so that external drill string is still within tension state when bearing bit pressure, to realize deviation control with drilling straight well
Drillng operation.The configuration of the present invention is simple, reliability are relatively high, do not sacrifice bit pressure and drilling speed, save drilling cost.
Further, in the power sub assembly, thrust bearing is equipped between lower part disc spring gasket ring and power transmission cylinder II.
Beneficial effect using above-mentioned further technical solution is: in precession power sub assembly center tap and position-limiting drum
When lower part power transmission cylinder II be able to maintain it is static.
Further, in the power sub assembly, piston I is set to I miner diameter end of power transmission cylinder and can float, in power transmission cylinder I
Sealing ring is set in the seal groove of bigger diameter end and piston I, power transmission cylinder I and piston I are set to body interior, in power transmission cylinder I
Seal chamber I is formed in miner diameter end outer wall and the annular space of inner body wall, and spring I is set in seal chamber.
Beneficial effect using above-mentioned further technical solution is: being formed between power transmission cylinder I, piston I and ontology close
Envelope chamber I is the hydraulic cavities for injecting high-voltage oil liquid, since I top of piston is resisted by center tap and can not be moved up, and then hydraulic
Under effect, so that power transmission cylinder I generates downward displacement, and then the disc spring gasket ring of its underpart generates extruding, so that disc spring group
Receiving is pressed down against power and increases its elastic potential energy, and spring I resets piston I after pressure release.
Further, in the power sub assembly, when by oil filler point to I fluid injection pressure oil of seal chamber, at oil filler point
Check valve is set.
Beneficial effect using above-mentioned further technical solution is: when by oil filler point to I fluid injection pressure oil of seal chamber,
Check valve is arranged at oil filler point can guarantee that the process of fluid injection pressure oil is gone on smoothly.
Further, in the power sub assembly, piston II is arranged in II miner diameter end of power transmission cylinder, and can float, in piston
Sealing ring is equipped in II seal groove, in piston II with upper bit, I bigger diameter end of power transmission cylinder with lower portion, central tube and ontology
Seal chamber II is formed in region between inner wall, and spring II is equipped between piston II and spring strut.
Beneficial effect using above-mentioned further technical solution is: by oil filler point to seal chamber I inject hydraulic oil it
Before, oil liquid is injected into seal chamber II, lubricating action is risen to disc spring group and thrust bearing.Passing through oil filler point to seal chamber I
When injecting hydraulic oil, power transmission cylinder I is moved down, and then disc spring gasket ring, disc spring group, power transmission cylinder II is pushed to move down, and is butted up against
Inside drill string in the double-deck drill string assembly of power sub assembly lower end generates extruding.Due to I bigger diameter end present position of power transmission cylinder
Ontology internal diameter is bigger than II present position ontology internal diameter of piston, therefore power transmission cylinder I and power transmission cylinder II move down identical displacement, can make
II reduced space of seal chamber, but injecting oil liquid medium in seal chamber II are obtained, and then piston is made to II hydrodynamic force of piston
II compressed spring II generates floating, and upper surface is separated with II bigger diameter end lower stage terrace of power transmission cylinder, supplements seal chamber II because of ontology
The volume that internal diameter is different and reduces.To guarantee by oil filler point to seal chamber I inject hydraulic oil when, power transmission cylinder I and its under
Disc spring gasket ring, disc spring group and the power transmission cylinder II in portion can be moved down smoothly, and generate extruding to the inside drill string of the double-deck drill string assembly.
Further, in the power sub assembly, pipe outer wall and II bigger diameter end inner wall of power transmission cylinder at center, setting screw thread connect
It connects, and is provided with seal groove in II bigger diameter end inner wall of power transmission cylinder and central tube contact position and is equipped with sealing ring in slot.
Beneficial effect using above-mentioned further technical solution is: setting is threadedly coupled central tube lower part outer wall and power transmission
II bigger diameter end inner wall of cylinder is affixed, enable central tube and power transmission cylinder II synchronize move down, the leakproofness of guarantee seal chamber II.
Further, in the power sub assembly, by oil filler point to seal chamber I inject hydraulic oil make power transmission cylinder I,
Disc spring gasket ring, disc spring group, power transmission cylinder II generate to bottom offset and generate expected squeeze to the inside drill string of the double-deck drill string of lower part
It after pressure, is connected through a screw thread and position-limiting drum is screwed in into center tap, and resist power transmission cylinder miner diameter end upper surface.Top connection is connected again
In center tap upper end, and its lower end is made to resist position-limiting drum upper end.Then the hydraulic oil inside seal chamber I is laid down again.
Beneficial effect using above-mentioned further technical solution is: in the case where seal chamber I injects hydraulic oil, the next cylinder
Corresponding position can easily be screwed in.In the process, screw thread is not under compression power, guarantees that screw thread force-bearing situation is preferable.
Further, in the power sub assembly, position-limiting drum upper end is set there are four uniform double wedge.
Beneficial effect using above-mentioned further technical solution is: position-limiting drum upper end double wedge facilitates the smooth precession of position-limiting drum,
One section of tool of auxiliary precession is equipped with the double wedge that can be engaged with position-limiting drum upper end double wedge.
Further, in the double-deck drill string assembly, internal drill string is equipped with several protrusions being bonded with external drill string inner wall
Part.
Beneficial effect using above-mentioned further technical solution is: convex portion is bonded with external drill string inner wall, in inside
While drill string receiving is pressed down against, play a part of righting to internal drill string, avoids when internal drill string bears to squeeze
Unstability bending occurs.
Further, in the double-deck drill string assembly, seal chamber III is formed between inner part drilling column outer wall and external drill string inner wall
And filled with lubricating oil, it is equipped with sealing drum in external drill string upper end, sealing drum inner wall is equipped with seal groove and is arranged in slot O-shaped
Sealing ring is equipped with seal groove in external drill string lower end inner wall and O-ring seal is arranged in slot.
Beneficial effect using above-mentioned further technical solution is: the lubricating oil in seal chamber III can guarantee inner part drilling
Column can be smooth without hindrance when being generated relative to external drill string to bottom offset by power sub assembly extruding force, and to inner part drilling
Column plays certain protective effect.
Further, in the power sub assembly, the double-deck drill string assembly and lower contact assembly, II miner diameter end end of power transmission cylinder
Face, internal drill string both sides of the face and thrust cylinder upper surface are provided with the waveform double wedge of uniform identical size.
Beneficial effect using above-mentioned further technical solution is: the uniform double wedge of waveform increases the stress surface of end face
Product, and make end face stress distribution uniform.
Further, in the lower contact assembly, thrust cylinder is set to inside joint body, inside lower end and joint body
Step face contact.
Beneficial effect using above-mentioned further technical solution is: thrust cylinder lower end is supported by the step surface inside joint body
Firmly, upper surface is contacted with internal drill string lower end surface, internal drill string be squeezed power generate to bottom offset when, internal drill string is supported
Firmly, so that internal drill string is in extruded state.
Detailed description of the invention
A kind of injection pressure formula bilayer drill string deviation control with drilling straight well drilling tool structure chart of the position Fig. 1 present invention.
Fig. 2 is power sub assembly structure chart of the present invention.
Fig. 3 is the double-deck drill string assembly structure chart of the present invention.
Fig. 4 is lower contact assembly structure chart of the present invention.
Fig. 5 is thrust washer schematic three dimensional views in thrust bearing of the present invention.
Fig. 6 is position-limiting drum schematic three dimensional views.
In figure: 01. power sub assembly: 01-1 top connection；01-2. center tap；01-3. position-limiting drum；01-4. central tube；
01-5. ontology；01-6. piston ring；01-7. piston I；01-8. spring I；01-9. plug cock；01-10. power transmission cylinder I；01-11. dish
Spring gasket ring；01-12. disc spring group；01-13. thrust bearing；01-14. power transmission cylinder II；01-15. piston II；01-16. spring II；
01-17. spring strut.The 02. double-deck drill string assembly: 02-1 sealing drum；02-2.O type circle I；Drill string inside 02-3.；It is bored outside 02-4.
Column；02-5.O type circle II.03. lower contact assembly: 03-1. joint body；03-2. thrust cylinder.04. drill bit.
Specific embodiment
The invention will be further described with embodiment with reference to the accompanying drawing.
As shown in Figure 1, a kind of injection pressure formula bilayer drill string deviation control with drilling straight well drilling tool of the present invention, dynamic pipe nipple 01, bilayer
Drill string assembly 02, lower contact assembly 03 and drill bit 04 form.
As shown in Fig. 2, injection pressure formula bilayer drill string deviation control with drilling straight well drilling tool power sub assembly, by top connection 01-1, in
Connector 01-2, position-limiting drum 01-3, central tube 01-4, ontology 01-5, piston ring 01-6, I 01-7 of piston, I 01-8 of spring, power transmission cylinder
I 01-9, disc spring gasket ring 01-10, plug cock 01-11, disc spring group 01-12, thrust bearing 01-13, II 01-14 of power transmission cylinder, piston II
01-15, II 01-16 of spring, spring strut 01-17 composition.The spring strut 01-17 is set to the stepped hole of the lower part ontology 01-5
Place, then II 01-16 of spring is installed to inside spring strut 01-17.II 01-15 of piston is set to II 01- of power transmission cylinder
14 miner diameter ends, the lower end the central tube 01-4 are connected through a screw thread with II 01-14 bigger diameter end inner wall of power transmission cylinder, and in power transmission cylinder II
Bigger diameter end inner wall is equipped with seal groove and O-ring seal is housed.Again by central tube 01-4, II 01-14 of power transmission cylinder, II 01- of piston
The entirety of 15 compositions is packed into inside ontology 01-5 by II miner diameter end of power transmission cylinder mode directed downwardly.The thrust bearing 01-13 setting
It is packed into inside ontology 01-5 downward in II upper end 01-14 of power transmission cylinder, then by lower part disc spring gasket ring 01-11 big end, and makes lower end surface
With the upper end thrust bearing 01-13 face contact.The disc spring group 01-12 is set to the annular between central tube 01-4 and ontology 01-5
Space interior.Top disc spring gasket ring 01-11 small end is set to the upper end disc spring group 01-12, and its lower end surface and disc spring group 01- downward
12 upper end face contacts.I 01-7 of piston is set to I 01-10 miner diameter end of power transmission cylinder, in I 01-7 of piston and I 01-10 of power transmission cylinder
I 01-8 of spring is set between step surface, and I 01-8 of spring is made to be inserted in I 01-10 miner diameter end of power transmission cylinder.Again by I 01-10 of power transmission cylinder,
The entirety of I 01-8 of spring, I 01-7 of piston composition is packed into inside ontology 01-5 in such a way that I 01-10 bigger diameter end of power transmission cylinder is directed downwardly.
The center tap 01-2 is connected through a screw thread installation and the upper end ontology 01-5, the lower end surface center tap 01-2 and I upper end 01-7 of piston
Face contact, and resist I 01-7 of piston.In completion is into seal chamber I after injection pressure, the position-limiting drum 01-3 is selected with specific purpose tool
Enter inside center tap 01-2, and makes its lower end surface and I upper end 01-10 face contact of power transmission cylinder, and resist I 01-10 of power transmission cylinder.By institute
Top connection 01-1 is stated to be connected through a screw thread loaded on the upper end center tap 01-2, lower end surface and the upper end position-limiting drum 01-4 face contact, and
Resist position-limiting drum 01-3.
As shown in figure 3, the double-deck drill string deviation control with drilling straight well drilling tool bilayer drill string assembly 02, by sealing drum 02-1, O-ring I
02-2, internal drill string 02-3, outside drill string 02-4 and II 02-5 of O-ring composition.The internal drill string 02-3 is installed on external brill
Inside column 02-4 and sealing drum 02-1, internal drill string 02-3 is equipped with several diameters protrusion equal with external drill string 02-4 internal diameter
It is bonded with external drill string 02-4, in order to avoid the internal drill string 02-3 buckle in compression bending under bit pressure effect.The sealing drum 02-1 is logical
It crosses external screw thread to screw with external drill string 02-4 upper internal threaded, and the step surface of its lower end surface and the outside top drill string 02-4 connects
Touching, sealing drum 02-1 lower inner wall is provided with seal groove, and is equipped with I 02-2 of O-ring.External drill string 02-5 lower inner wall is provided with close
Seal slot is simultaneously equipped with II 02-5 of O-ring, and II 02-5 of O-ring is bonded with internal drill string 02-3 outer wall to reach sealing effect.
As shown in figure 4, the double-deck drill string deviation control with drilling straight well drilling tool lower contact assembly 03, by joint body 03-1, thrust cylinder
03-2 composition.Thrust cylinder 03-2 is installed on inside joint body 03-1, and lower end surface connects with the step surface in joint body 03-1
Touching.
As shown in figure 5, the upper and lower end face of the thrust washer in thrust bearing 01-13 is all provided with equally distributed slot, each
Axial cylindrical hole is all drilled in slot, in order to which the hydraulic oil injected by oil filler point can smoothly flow through corresponding region, to thrust shaft
It holds rolling element and carries out good lubrication.
As shown in fig. 6, the upper end position-limiting drum 01-3 double wedge facilitates the smooth precession of position-limiting drum.
In the description of the present invention, it is to be understood that, term " inside ", " top ", " lower part ", " bigger diameter end ", " path
The orientation or positional relationship of the instructions such as end " is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of describing this hair
Bright and simplified description, rather than the device or element of indication or suggestion meaning must have a particular orientation, with specific orientation
Construction and operation, therefore be not considered as limiting the invention.
In the present invention unless specifically defined or limited otherwise, term " installation ", " contact ", " fitting ", " connection ",
Terms such as " resisting " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be with
It is to be connected directly, the connection inside two elements or the phase of two elements can also be can be indirectly connected through an intermediary
Interaction relationship.For the ordinary skill in the art, above-mentioned term can be understood in the present invention as the case may be
In concrete meaning.
In the present invention unless specifically defined or limited otherwise, fisrt feature second feature "upper" or "lower"
It may include that the first and second features directly contact, also may include that the first and second features are not direct contacts but pass through it
Between other characterisation contact.Moreover, fisrt feature includes the first spy above the second feature " above ", " above " and " above "
Sign is right above second feature and oblique upper, or is merely representative of first feature horizontal height higher than second feature.Fisrt feature exists
Second feature " under ", " lower section " and " following " include that fisrt feature is directly below and diagonally below the second feature, or is merely representative of
First feature horizontal height is less than second feature.
A kind of injection pressure formula bilayer drill string deviation control with drilling straight well spudder of the present invention is described in detail above, it is used herein
A specific example illustrates the principle and implementation of the invention.The above embodiments are only used to help understand
Core of the invention thought；At the same time, for those skilled in the art, according to the thought of the present invention, in specific embodiment party
There will be changes in formula and application range, in conclusion the contents of this specification are not to be construed as limiting the invention.
Claims (4)
1. a kind of injection pressure formula bilayer drill string deviation control with drilling straight well drilling tool, including power sub assembly, the double-deck drill string assembly, lower contact
Assembly and drill bit；Wherein power sub assembly include top connection, center tap, position-limiting drum, central tube, ontology, piston ring, piston I,
Spring I, power transmission cylinder I, disc spring gasket ring, plug cock, disc spring group, thrust bearing, power transmission cylinder II, piston II, spring II, spring strut；It is double
Layer drill string assembly includes sealing drum, internal drill string, external drill string；Lower contact assembly includes joint body, thrust cylinder；Its feature exists
In: the double-deck drill string deviation control with drilling straight well drilling tool is power sub assembly, the double-deck drill string assembly, lower contact assembly and brill from top to bottom
Head is sequentially connected.
2. a kind of injection pressure formula bilayer drill string deviation control with drilling straight well drilling tool according to claim 1, it is characterised in that: the power sub
Top connection is connected with quiet connector by screw thread in assembly；Quiet connector lower end is connect with ontology upper end；Position-limiting drum passes through external screw thread
It is screwed with quiet connector internal screw thread；Piston ring is set in quiet connector lower end inner wall groove；I top half of power transmission cylinder is placed on quiet connector
Inside, bigger diameter end are bonded with inner body wall；Piston I is set in the annular space that ontology and I miner diameter end of power transmission cylinder are formed；Piston
I, the space between I step surface of ontology and power transmission cylinder forms seal chamber I；Spring I is set under piston lower surface and power transmission cylinder I
Between portion's step surface；It is provided with oil filler point on ontology, is equipped with plug cock at oil filler point；Disc spring gasket ring is respectively placed in disc spring group both ends；Dish
Spring is set between two disc spring gasket rings；Thrust bearing is set between lower part disc spring gasket ring and power transmission cylinder II；Piston II is arranged
In the annular space that ontology and II miner diameter end of power transmission cylinder are formed；I big end lower end surface of power transmission cylinder, II upper surface of piston and ontology
Seal chamber II is formed between inner wall；Spring II is set between piston II and spring strut；Spring strut is set to II lower end of spring, this
Internal portion；II bigger diameter end of power transmission cylinder upward, is integrally placed in ontology, and upper surface is contacted with thrust washer under thrust bearing, and small
Diameter end cap enters piston II, spring II, inside spring strut；Central tube is placed on position-limiting drum, power transmission cylinder I, disc spring gasket ring, disc spring group, stops
Inside thrust bearing and power transmission cylinder II, and lower end is equipped with one section of external screw thread and screws with II bigger diameter end internal screw thread of power transmission cylinder.
3. a kind of injection pressure formula bilayer drill string deviation control with drilling straight well drilling tool according to claim 1, it is characterised in that: the bilayer
Internal drill string is set to inside external drill string in drill string assembly；Internal drill string upper end is equipped with a sealing drum, and sealing drum passes through outer spiral shell
Line is screwed with external drill string upper end internal screw thread, inside be provided with seal groove, be equipped with O-ring in slot, guarantee leakproofness；It bores outside
Column lower end is provided with seal groove, is equipped with O-ring in slot.
4. a kind of injection pressure formula bilayer drill string deviation control with drilling straight well drilling tool according to claim 1, it is characterised in that: connect under described
Head assembly center tap body interior is equipped with stepped hole；Thrust cylinder is set to inside joint body, inside lower end surface and joint body
The step face contact of stepped hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910326135.XA CN110029936B (en) | 2019-04-23 | 2019-04-23 | Injection-type double-layer drill string anti-deviation straight drilling tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910326135.XA CN110029936B (en) | 2019-04-23 | 2019-04-23 | Injection-type double-layer drill string anti-deviation straight drilling tool |
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| Publication Number | Publication Date |
|---|---|
| CN110029936A true CN110029936A (en) | 2019-07-19 |
| CN110029936B CN110029936B (en) | 2020-06-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910326135.XA Active CN110029936B (en) | 2019-04-23 | 2019-04-23 | Injection-type double-layer drill string anti-deviation straight drilling tool |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112065280A (en) * | 2020-09-29 | 2020-12-11 | 山西风雷钻具有限公司 | Vertical drilling tool |
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| CN110029936B (en) | 2020-06-30 |
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