CN110029936B - Injection-type double-layer drill string anti-deviation straight drilling tool - Google Patents
Injection-type double-layer drill string anti-deviation straight drilling tool Download PDFInfo
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- CN110029936B CN110029936B CN201910326135.XA CN201910326135A CN110029936B CN 110029936 B CN110029936 B CN 110029936B CN 201910326135 A CN201910326135 A CN 201910326135A CN 110029936 B CN110029936 B CN 110029936B
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- 238000005553 drilling Methods 0.000 title claims abstract description 53
- 210000002445 nipple Anatomy 0.000 claims abstract description 21
- 230000005540 biological transmission Effects 0.000 claims description 52
- 238000007789 sealing Methods 0.000 claims description 48
- 210000001503 joint Anatomy 0.000 claims description 14
- 238000002347 injection Methods 0.000 claims description 13
- 239000007924 injection Substances 0.000 claims description 13
- 239000010410 layer Substances 0.000 abstract description 32
- 238000007906 compression Methods 0.000 abstract description 4
- 230000006835 compression Effects 0.000 abstract description 2
- 239000002355 dual-layer Substances 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 17
- 230000009286 beneficial effect Effects 0.000 description 12
- 238000001125 extrusion Methods 0.000 description 9
- 239000010720 hydraulic oil Substances 0.000 description 8
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 6
- 235000017491 Bambusa tulda Nutrition 0.000 description 6
- 241001330002 Bambuseae Species 0.000 description 6
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 6
- 239000011425 bamboo Substances 0.000 description 6
- 238000006073 displacement reaction Methods 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000005755 formation reaction Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000010687 lubricating oil Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 238000005381 potential energy Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000002699 waste material Substances 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
- E21B12/00—Accessories for drilling tools
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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
- 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 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
-
- 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
- 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 invention relates to an injection-type double-layer drill string anti-deviation straight drilling tool which is used for drilling a straight well (or a straight well section) in drilling engineering. The structure mainly comprises: the power nipple assembly provides power for enabling the drill string inside the double-layer drill string to be pressed and the drill string outside the double-layer drill string to be pulled; the double-layer drill string assembly comprises an inner drill string and an outer drill string, the inner drill string is pressed under the action of the power nipple assembly and the lower joint assembly, and the outer drill string is in a tension state; the lower joint assembly connects the dual layer drill string assembly and the drill bit. The outer drill stem is in a tension state before the outer drill stem is not subjected to the bit pressure, when the outer drill stem is subjected to the bit pressure, one part of tension borne by the double-layer drill stem assembly is used for offsetting the pressure applied by the bit pressure to the double-layer drill stem assembly, the double-layer drill stem assembly is still in a compression state of the inner drill stem, and the outer drill stem is in a tension state, so that the drill stem is not bent, and the anti-deviation straightening purpose is realized. The invention does not reduce the bit pressure and has relatively simple structure.
Description
Technical Field
The invention belongs to the field of petroleum and natural gas drilling tools, and particularly relates to an injection type double-layer drill string anti-deviation straight drilling tool.
Background
With the continued development of the exploration and development of oil and gas resources, problems encountered during drilling, such as formation (e.g., highly deviated geological formations), formation hardness non-uniformity, drill tool type and configuration, and drill tool assembly, result in the inability of the drilled straight (or diametric) well trajectory to achieve the desired purpose (a perfectly vertical or full well deviation of 0 °) during drilling. Therefore, the technology of 'preventing inclined drilling straight' can reduce the drilling cost to a certain extent and avoid resource waste.
In order to reduce the drilling cost caused by well deviation to a greater extent, the technology of deviation prevention and correction is a constant research subject. Conventional vertical drilling tools (e.g., full hole drilling assemblies and pendulum drilling tools) are limited in that the lateral force of the drilling tool is used as a power source for preventing or reducing inclination at the expense of weight on bit and drilling speed. In addition, although vertical drilling tools such as eccentric drilling tools, off-axis drilling tools, flexible drilling tools, reverse pendulum drilling tools, and directional drilling tools can better control well deviation and improve the mechanical drilling rate, such drilling tool assemblies are complex in structure and still have insufficient capability of resisting the formation deviation force.
The working principle of the existing vertical drilling tool is comprehensively analyzed, either the anti-inclination purpose is realized by sacrificing bit pressure and drilling speed, or the drilling tool combination structure is relatively complex, or the drilling tool combination structure cannot bear high temperature due to the existence of a large number of electronic elements, and is relatively complex in structure and poor in reliability. Aiming at the related problems of the existing vertical drilling tool, the research and development of the relatively reliable anti-deviation straight drilling tool with simple structure and without sacrificing bit pressure and drilling speed has far-reaching significance in promoting the development of the drilling field.
Disclosure of Invention
The invention aims to solve the problems that the traditional vertical drilling tool has poor reliability, cannot bear high temperature, has a complex structure and the like due to the sacrifice of the weight and the drilling speed, and provides an anti-deviation straight drilling tool which has a relatively simple structure, does not sacrifice the weight and the drilling speed and has relatively high reliability for the field of oil and gas drilling.
In order to achieve the purpose, the invention adopts the technical scheme that: an injection-type double-layer drill string anti-deviation straight drilling tool comprises a power nipple assembly, a double-layer drill string assembly, a lower connector assembly and a drill bit. The power nipple assembly comprises an upper joint, a middle joint, a limiting cylinder, a central pipe, a body, a piston ring, a piston I, a spring I, a force transmission cylinder I, a disc spring backing ring, a disc spring group, a thrust bearing, a force transmission cylinder II, a piston II, a spring II and a spring cylinder; the double-layer drill string assembly comprises a sealing cylinder, an inner drill string and an outer drill string; the lower joint assembly comprises a joint body and a spring barrel. The method is characterized in that: the double-layer drill string anti-deviation straight drilling tool is formed by sequentially connecting a power nipple assembly, a double-layer drill string assembly, a lower connector assembly and a drill bit from top to bottom.
The invention has the beneficial effects that: before the injection-compression type double-layer drill string anti-deviation straight drilling tool bears the bit pressure, the power provided by the power nipple assembly extrudes an inner drill string in the double-layer drill string assembly, so that the inner drill string is in a compression state; the inner drill string exerts a counteracting pulling force on the outer drill string, so that the outer drill string is in tension. When the injection-compression type double-layer drill string anti-deviation straightening drilling tool bears the bit pressure, part of the pre-stressed pulling force of the outer drill string in the double-layer drill string assembly is used for offsetting the bit pressure, so that the outer drill string is still in a pulled state when bearing the bit pressure, and the anti-deviation straightening drilling operation is realized. The invention has simple structure, relatively high reliability, no sacrifice of bit pressure and bit rate and drilling cost saving.
Furthermore, in the power nipple assembly, a thrust bearing is arranged between the lower disc spring backing ring and the force transmission barrel II.
The beneficial effect of adopting the further technical scheme is that: and the force transmission barrel II at the lower part can keep static when the joint in the power nipple assembly is screwed in and when the limiting barrel is screwed in.
Further, in the power nipple joint assembly, piston I sets up in I path end of biography power section of thick bamboo and can float, sets up the sealing washer in I big footpath end of biography power section of thick bamboo and the sealing washer groove of piston I, will pass power section of thick bamboo I and set up inside the body with piston I, forms sealed chamber I in the annular space of I path end outer wall of biography power section of thick bamboo and body inner wall, sets up spring I in sealed chamber.
The beneficial effect of adopting the further technical scheme is that: a sealed chamber I that forms between biography power section of thick bamboo I, piston I and the body is for the hydraulic pressure chamber of pouring into high-pressure fluid into, because I upper portion of piston is supported by the middle-head and can't shift up, and then under hydraulic pressure's effect for biography power section of thick bamboo I produces decurrent displacement, and then the dish spring backing ring of its lower part produces the extrusion, and then makes the dish spring group bear down extrusion force and increase its elastic potential energy, and spring I makes piston I reset after the pressure release.
Furthermore, in the power nipple assembly, when the sealing cavity I is filled with hydraulic oil through the oil injection hole, a check valve is arranged at the oil injection hole.
The beneficial effect of adopting the further technical scheme is that: when the oil injection hole is used for injecting the liquid and the pressure oil into the sealing cavity I, the check valve is arranged at the oil injection hole, so that the process of injecting the liquid and the pressure oil can be smoothly carried out.
Further, in the power nipple assembly, a piston II is arranged at the small-diameter end of the force transmission cylinder II and can float, a sealing ring is arranged in a sealing ring groove of the piston II, a sealing cavity II is formed in the area between the part above the piston II, the part below the large-diameter end of the force transmission cylinder I and the central pipe and the inner wall of the body, and a spring II is arranged between the piston II and the spring cylinder.
The beneficial effect of adopting the further technical scheme is that: before hydraulic oil is injected into the sealing cavity I through the oil injection hole, oil is injected into the sealing cavity II, and the disc spring group and the thrust bearing are lubricated. When hydraulic oil is injected into the sealing cavity I through the oil injection hole, the force transmission barrel I moves downwards, the disc spring backing ring, the disc spring group and the force transmission barrel II are further pushed to move downwards, and the inner drill column in the double-layer drill column assembly at the lower end of the power nipple assembly is butted to generate extrusion. Because the inner diameter of the body at the position of the large-diameter end of the force transmission cylinder I is larger than that of the body at the position of the piston II, the force transmission cylinder I and the force transmission cylinder II move downwards for the same displacement, so that the space of the sealing cavity II is reduced, but the sealing cavity II is filled with an oil medium, so that hydraulic pressure is generated on the piston II to enable the piston II to compress the spring II to float, the upper end surface is separated from the step surface at the lower part of the large-diameter end of the force transmission cylinder II, and the volume of the sealing cavity II reduced due to different inner diameters of the body is. Therefore, when hydraulic oil is injected into the sealing cavity I through the oil injection hole, the force transmission cylinder I and the disc spring backing ring, the disc spring group and the force transmission cylinder II on the lower portion of the force transmission cylinder I can move downwards smoothly, and the internal drill column of the double-layer drill column assembly is extruded.
Furthermore, in the power nipple assembly, the outer wall of the central pipe is in threaded connection with the inner wall of the large-diameter end of the force transmission cylinder II, a sealing ring groove is formed in the contact position of the inner wall of the large-diameter end of the force transmission cylinder II and the central pipe, and a sealing ring is arranged in the groove.
The beneficial effect of adopting the further technical scheme is that: the outer wall of the lower part of the central tube is fixedly connected with the inner wall of the large-diameter end of the force transmission cylinder II through threaded connection, so that the central tube and the force transmission cylinder II can synchronously move downwards, and the sealing performance of the sealing cavity II is ensured.
Furthermore, in the power nipple assembly, after hydraulic oil is injected into the sealing cavity I through the oil injection hole to enable the force transmission cylinder I, the disc spring backing ring, the disc spring group and the force transmission cylinder II to generate downward displacement and generate expected extrusion force on an inner drill column of a lower double-layer drill column, the limiting cylinder is screwed into the middle joint through threaded connection and abuts against the upper end face of the small-diameter end of the force transmission cylinder. And then the upper joint is connected with the upper end of the middle joint, and the lower end of the upper joint is abutted against the upper end of the limiting cylinder. Then the hydraulic oil in the sealed cavity I is discharged.
The beneficial effect of adopting the further technical scheme is that: under the condition that hydraulic oil is injected into the sealing cavity I, the lower cylinder can be easily screwed into the corresponding position. In the process, the threads are not subjected to extrusion force, so that the stress condition of the threads is better.
Furthermore, in the power nipple assembly, the upper end of the limiting cylinder is provided with four uniform convex teeth.
The beneficial effect of adopting the further technical scheme is that: the convex teeth at the upper end of the limiting cylinder facilitate the smooth precession of the limiting cylinder, and convex teeth capable of being meshed with the convex teeth at the upper end of the limiting cylinder are arranged at one section of the tool for assisting the precession.
Furthermore, in the double-layer drill string assembly, a plurality of convex parts attached to the inner wall of the outer drill string are arranged on the inner drill string.
The beneficial effect of adopting the further technical scheme is that: the bulge is attached to the inner wall of the external drill string, and when the internal drill string bears downward extrusion, the bulge has a righting effect on the internal drill string, so that unstable bending is avoided when the internal drill string bears the extrusion condition.
Furthermore, in the double-layer drill string assembly, a sealing cavity III is formed between the outer wall of the inner drill string and the inner wall of the outer drill string and filled with lubricating oil, a sealing cylinder is arranged at the upper end of the outer drill string, a sealing ring groove is formed in the inner wall of the sealing cylinder, an O-shaped sealing ring is arranged in the groove, and a sealing ring groove is formed in the inner wall of the lower end of the outer drill string, and an O-shaped sealing ring is arranged in.
The beneficial effect of adopting the further technical scheme is that: lubricating oil in the sealed cavity III can ensure that the internal drill string can be smoothly unobstructed when the internal drill string generates downward displacement relative to the external drill string under the extrusion force of the power nipple assembly, and plays a certain role in protecting the internal drill string.
Furthermore, in the power nipple assembly, the double-layer drill string assembly and the lower joint assembly, the small-diameter end face of the force transmission cylinder II, the end faces on two sides of the internal drill string and the upper end face of the thrust cylinder are provided with uniform wavy convex teeth with the same size.
The beneficial effect of adopting the further technical scheme is that: the wave-shaped uniform convex teeth increase the stress area of the end face and enable the stress distribution of the end face to be uniform.
Further, in the lower joint assembly, the thrust cylinder is arranged inside the joint body, and the lower end of the thrust cylinder is in surface contact with a step inside the joint body.
The beneficial effect of adopting the further technical scheme is that: the lower end of the thrust cylinder is abutted by the step surface in the connector body, the upper end surface of the thrust cylinder is in contact with the lower end surface of the internal drill string, and when the internal drill string is subjected to downward displacement due to extrusion force, the internal drill string is abutted, so that the internal drill string is in an extruded state.
Drawings
FIG. 1 is a schematic diagram of an injection-type double-layer drill string anti-deviation straight drilling tool according to the present invention.
FIG. 2 is a structural diagram of the power sub assembly of the present invention.
FIG. 3 is a block diagram of a dual layer drill string assembly of the present invention.
FIG. 4 is a view of the structure of the lower joint assembly of the present invention.
FIG. 5 is a three-dimensional schematic view of a thrust washer in the thrust bearing of the present invention.
Fig. 6 is a three-dimensional schematic view of a limiting cylinder.
In the figure: 01. a power short section assembly: 01-1 upper joint; 01-2. middle joint; 01-3, a limiting cylinder; 01-4, a central tube; 01-5, main body; 01-6, piston ring; 01-7, piston I; 01-8, spring I; 01-9, oil plug; 01-10, force transmission cylinder I; 01-11. disc spring backing ring; 01-12, disc spring group; 01-13, thrust bearing; 01-14, force transmission cylinder II; 01-15, piston II; 01-16, spring II; 01-17, spring tube. 02. Double-deck drill string assembly: 02-1 sealing the cylinder; 02-2. O-shaped ring I; 02-3. inner drill string; 02-4. an outer drill string; 02-5. O-shaped ring II. 03. The lower joint assembly: 03-1. a joint body; 03-2, a thrust cylinder. 04. A drill bit.
Detailed Description
The invention is further described with reference to the following figures and embodiments.
As shown in figure 1, the invention relates to an injection-type double-layer drill string anti-deviation straight drilling tool, which comprises a power short section 01, a double-layer drill string assembly 02, a lower connector assembly 03 and a drill bit 04.
As shown in figure 2, the injection type double-layer drill string anti-deviation straight drilling tool power nipple assembly is composed of an upper connector 01-1, a middle connector 01-2, a limiting cylinder 01-3, a central pipe 01-4, a body 01-5, a piston ring 01-6, a piston I01-7, a spring I01-8, a force transmission cylinder I01-9, a disc spring backing ring 01-10, an oil plug 01-11, a disc spring group 01-12, a thrust bearing 01-13, a force transmission cylinder II 01-14, a piston II 01-15, a spring II 01-16 and a spring cylinder 01-17. The spring cylinders 01-17 are arranged at the step holes at the lower parts of the bodies 01-5, and then the springs II 01-16 are arranged inside the spring cylinders 01-17. The piston II 01-15 is arranged at the small-diameter end of the force transmission cylinder II 01-14, the lower end of the central tube 01-4 is connected with the inner wall of the large-diameter end of the force transmission cylinder II 01-14 through threads, and the inner wall of the large-diameter end of the force transmission cylinder II is provided with a sealing ring groove and an O-shaped sealing ring. And then the whole body consisting of the central tube 01-4, the force transmission cylinder II 01-14 and the piston II 01-15 is arranged in the body 01-5 in a mode that the small diameter end of the force transmission cylinder II faces downwards. The thrust bearing 01-13 is arranged at the upper end of the force transmission barrel II 01-14, the big end of the lower disc spring backing ring 01-11 is downwards arranged in the body 01-5, and the lower end face is contacted with the upper end face of the thrust bearing 01-13. The disc spring group 01-12 is arranged in the annular space between the central tube 01-4 and the body 01-5. The small end of the upper disc spring backing ring 01-11 is arranged at the upper end of the disc spring group 01-12 downwards, and the lower end face of the upper disc spring backing ring is contacted with the upper end face of the disc spring group 01-12. The piston I01-7 is arranged at the small-diameter end of the force transmission cylinder I01-10, the spring I01-8 is arranged between the piston I01-7 and the step surface of the force transmission cylinder I01-10, and the spring I01-8 is sleeved into the small-diameter end of the force transmission cylinder I01-10. And then the whole body consisting of the force transmission cylinder I01-10, the spring I01-8 and the piston I01-7 is arranged in the body 01-5 in a mode that the large-diameter end of the force transmission cylinder I01-10 faces downwards. The middle joint 01-2 is connected with the upper end of the body 01-5 through threads, and the lower end face of the middle joint 01-2 is contacted with the upper end face of the piston I01-7 and props against the piston I01-7. After injection pressure is finished in the sealing cavity I, the limiting cylinder 01-3 is selected into the middle joint 01-2 by a special tool, and the lower end face of the limiting cylinder is contacted with the upper end face of the force transmission cylinder I01-10 and is propped against the force transmission cylinder I01-10. The upper joint 01-1 is arranged at the upper end of the middle joint 01-2 through threaded connection, and the lower end face of the upper joint is contacted with the upper end face of the limiting cylinder 01-4 and is propped against the limiting cylinder 01-3.
As shown in FIG. 3, the double-layer drill string assembly 02 of the double-layer drill string deviation-prevention straight drilling tool comprises a sealing cylinder 02-1, an O-shaped ring I02-2, an inner drill string 02-3, an outer drill string 02-4 and an O-shaped ring II 02-5. The inner drill string 02-3 is installed inside the outer drill string 02-4 and the sealing cylinder 02-1, a plurality of protrusions with the diameter equal to the inner diameter of the outer drill string 02-4 are arranged on the inner drill string 02-3 and attached to the outer drill string 02-4, and therefore the inner drill string 02-3 is prevented from being stressed, unstably and bent under the action of the bit pressure. The sealing cylinder 02-1 is screwed with internal threads on the upper part of the external drill string 02-4 through external threads, the lower end face of the sealing cylinder is contacted with a step surface on the upper part of the external drill string 02-4, and the inner wall of the lower part of the sealing cylinder 02-1 is provided with a sealing ring groove and an O-shaped ring I02-2. The inner wall of the lower part of the outer drill stem 02-5 is provided with a sealing ring groove and an O-shaped ring II 02-5, and the O-shaped ring II 02-5 is attached to the outer wall of the inner drill stem 02-3 to achieve the sealing effect.
As shown in FIG. 4, the lower joint assembly 03 of the double-layer drill string anti-deviation straight drilling tool comprises a joint body 03-1 and a thrust cylinder 03-2. The thrust cylinder 03-2 is arranged in the joint body 03-1, and the lower end face of the thrust cylinder is in contact with a step surface in the joint body 03-1.
As shown in FIG. 5, the thrust washers of the thrust bearings 01-13 have grooves uniformly distributed on their upper and lower end surfaces, and each groove has an axial cylindrical hole drilled therein, so that the hydraulic oil injected through the oil injection hole can smoothly flow through the corresponding area to lubricate the rolling elements of the thrust bearing.
As shown in fig. 6, the convex teeth at the upper end of the limiting cylinder 01-3 facilitate the smooth screwing of the limiting cylinder.
In the description of the present invention, it is to be understood that the terms "inner", "upper", "lower", "large diameter end", "small diameter end", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the present invention, unless otherwise specifically stated or limited, the terms "mounted," "contacting," "engaging," "connecting," "abutting," and the like are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The injection-type double-layer drill string deviation-preventing straight driller is described in detail above, and the principle and the implementation mode of the invention are explained by applying specific examples in the text. The above description of the embodiments is only intended to facilitate the understanding of the core ideas of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (3)
1. An injection-type double-layer drill string anti-deviation straight drilling tool comprises a power nipple assembly, a double-layer drill string assembly, a lower connector assembly and a drill bit; the power nipple assembly comprises an upper joint, a middle joint, a limiting cylinder, a central pipe, a body, a piston ring, a piston I, a spring I, a force transmission cylinder I, a disc spring backing ring, an oil plug, a disc spring group, a thrust bearing, a force transmission cylinder II, a piston II, a spring II and a spring cylinder; the double-layer drill string assembly comprises a sealing cylinder, an inner drill string and an outer drill string; the lower joint assembly comprises a joint body and a thrust cylinder; an injection type double-layer drill string anti-deviation straight drilling tool is characterized in that a power short section assembly, a double-layer drill string assembly, a lower connector assembly and a drill bit are sequentially connected from top to bottom; the power nipple assembly is characterized in that an upper joint and a middle joint are connected through threads, the lower end of the middle joint is connected with the upper end of a body, a limiting cylinder is screwed with the inner threads of the middle joint through external threads, a piston ring is arranged in a groove in the inner wall of the lower end of the middle joint, the upper half part of a force transmission cylinder I is sleeved in the middle joint, a large-diameter end is attached to the inner wall of the body, a piston I is arranged in an annular space formed by the body and the small-diameter end of the force transmission cylinder I, a sealed cavity I is formed by the piston I, the body and the step surface of the force transmission cylinder I, a spring I is arranged between the lower end surface of the piston I and the; the disc spring backing rings are respectively arranged at two ends of the disc spring group, the disc spring is arranged between the two disc spring backing rings, the thrust bearing is arranged between the lower disc spring backing ring and the force transmission cylinder II, the piston II is arranged in an annular space formed by the body and the small diameter end of the force transmission cylinder II, a sealing cavity II is formed in the part above the piston II, the part below the large diameter end of the force transmission cylinder I and the area between the central tube and the inner wall of the body, the spring II is arranged between the piston II and the spring cylinder, the spring cylinder is arranged at the lower end of the spring II, the inside of the body is provided, the large diameter end of the force transmission cylinder II faces upwards, the whole body, and the small-diameter end is sleeved in the piston II, the spring II and the spring barrel, the central pipe is sleeved in the limiting barrel, the force transmission barrel I, the disc spring backing ring, the disc spring group, the thrust bearing and the force transmission barrel II, and the lower end of the central pipe is provided with a section of external thread which is screwed with the internal thread at the large-diameter end of the force transmission barrel II.
2. The injection-type double-layer drill string anti-deviated straight drilling tool according to claim 1, wherein: the inner drill string in the double-layer drill string assembly is arranged inside the outer drill string; the upper end of the internal drill column is provided with a sealing barrel, the sealing barrel is screwed with the internal thread at the upper end of the external drill column through external threads, a sealing ring groove is formed in the sealing barrel, and an O-shaped ring is arranged in the groove to ensure the sealing property; the lower end of the external drill column is provided with a sealing ring groove, and an O-shaped ring is arranged in the groove.
3. The injection-type double-layer drill string anti-deviated straight drilling tool according to claim 1, wherein: a step hole is formed in the connector body of the lower connector assembly; the thrust cylinder is arranged in the connector body, and the lower end face of the thrust cylinder is in contact with a step surface of a step hole in the connector body.
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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110029936A CN110029936A (en) | 2019-07-19 |
| CN110029936B true CN110029936B (en) | 2020-06-30 |
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| 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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| 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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| CN104514497A (en) * | 2013-09-30 | 2015-04-15 | 扬州市油田金达实业有限公司 | Automatic deviation prevention and deviation correction drill collar |
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| CN110029936A (en) | 2019-07-19 |
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