CN115788278B - Screw pulse drag reduction drilling tool - Google Patents
Screw pulse drag reduction drilling tool Download PDFInfo
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- CN115788278B CN115788278B CN202211558140.1A CN202211558140A CN115788278B CN 115788278 B CN115788278 B CN 115788278B CN 202211558140 A CN202211558140 A CN 202211558140A CN 115788278 B CN115788278 B CN 115788278B
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Abstract
The lower end of the upper joint extends into and is connected to the upper end of the vibration assembly, the lower end of the vibration assembly is connected to the upper end of the middle joint, the lower end of the middle joint is connected to the upper end of the power assembly, the lower end of the power assembly is connected to the upper end of the lower joint, the power assembly comprises a power sleeve, a screw stator and a screw rotor which are fixedly arranged in the power sleeve, the lower end of the screw rotor is connected to the valve disc assembly through a connecting shaft, and the valve disc assembly comprises a static valve disc fixedly connected in the lower joint and a dynamic valve disc fixedly connected with the connecting shaft; therefore, the invention has simple structure, convenient operation and maintenance, effectively overcomes the defects of the prior art, further improves the drilling effect and the drilling efficiency, improves the vibration efficiency and effectively avoids pressure holding.
Description
Technical Field
The invention relates to the technical field of drilling in petroleum and natural gas exploration operations, in particular to a screw type pulse drag reduction drilling tool with improved efficiency and stable impact.
Background
With the continuous development of human science and technology life, the requirements and supply of resources are also increasing, and the petroleum and natural gas on the earth surface is gradually developed, so that the depth of petroleum and natural gas exploration drilling is increasing, and the drilling structure is also more complex.
When the conventional technology is used for drilling, the drilling period is longer, the complex conditions encountered in the drilling process are more, the drilling tool is easy to generate friction with the well wall during the drilling, the friction is firstly axial friction generated during sliding drilling, and the friction is also circumferential friction generated during rotary drilling, and the friction is easy to damage the drilling tool.
In order to avoid the defects caused by friction, many countries develop drilling tools, in which pulse drag reduction drilling tools for reducing friction by hydraulic pulse are rapidly developed and researched, in the existing drilling tools, a vibration assembly and a power assembly are usually combined, rotation power is provided for the power assembly by hydraulic force, and axial oscillation of the drilling tools is provided by the power assembly and the vibration assembly to reduce friction between the drilling tools and a well wall, so that the sliding drilling effect and the directional drilling efficiency can be improved to a certain extent.
However, the existing pulse drag reduction drilling tools are easy to generate pressure holding and have low efficiency.
Therefore, the designer of the invention has the defects that the screw type pulse drag reduction drilling tool is researched and designed by intensively researching and designing and combining the experiences and achievements of related industries for a long time.
Disclosure of Invention
The invention aims to provide a screw type pulse drag reduction drilling tool which is simple in structure, convenient to operate and maintain, capable of effectively overcoming the defects of the prior art, further improving drilling effect and drilling efficiency, and effectively avoiding pressure holding.
In order to achieve the above object, the present invention discloses a screw type pulse drag reduction drilling tool, comprising an upper joint, a vibration assembly, a middle joint, a power assembly, a valve disc assembly and a lower joint, wherein the lower end of the upper joint extends into and is connected to the upper end of the vibration assembly, the lower end of the vibration assembly is connected to the upper end of the middle joint, the lower end of the middle joint is connected to the upper end of the power assembly, and the lower end of the power assembly is connected to the upper end of the lower joint, the screw type pulse drag reduction drilling tool is characterized in that:
the upper joint, the vibration assembly and the middle joint are provided with through center holes so that high-pressure drilling fluid flows to the power assembly, the power assembly comprises a power sleeve and a screw stator fixedly arranged in the power sleeve, a screw rotor is arranged in a spiral cavity of the screw stator so as to reduce the pressure of the high-pressure drilling fluid to be converted into rotary motion of the screw rotor, the lower end of the screw rotor is connected to the valve disc assembly through a connecting shaft, and the valve disc assembly comprises a static valve disc fixedly connected in the lower joint and a movable valve disc fixedly connected with the connecting shaft;
the valve plate comprises a disc-shaped valve body, a liquid inlet chamber is arranged in the valve body, a plurality of liquid inlet holes are formed in the peripheral wall of the liquid inlet chamber at equal angular intervals, a first eccentric hole is formed in the lower portion of the liquid inlet chamber, the static valve plate comprises a disc-shaped static valve body, the center axes of the valve plate and the static valve plate are overlapped, a second eccentric hole is formed in the static valve body, a transition hole is formed in the static valve body above the second eccentric hole, the upper end of the transition hole is communicated to the first eccentric hole, and the lower end of the transition hole is communicated to the second eccentric hole.
Wherein: the vibration assembly comprises an outer sleeve and a piston outer sleeve which are sequentially connected, the lower end of the upper joint is provided with a joint shaft which stretches into the outer sleeve, a spring is arranged between the joint shaft and the outer sleeve, a piston inner sleeve is further arranged in the piston outer sleeve, and a piston capable of moving back and forth to provide a drag reduction effect is arranged between the piston inner sleeve and the piston outer sleeve.
Wherein: the lower joint forms a step-shaped accommodating cavity which is gradually increased from top to bottom at the periphery of the movable valve disc, and the movable valve disc is arranged in the accommodating cavity.
Wherein: the upper end of the movable valve body is fixed to the connecting shaft, and a part of the periphery thereof is rotatably fixed to the inner wall of the lower joint through a bearing member.
Wherein: the liquid inlet holes are obliquely arranged at a certain angle.
Wherein: the transition hole is a non-eccentric hole, the diameter of the transition hole is larger than or equal to the maximum eccentric diameter of the first eccentric hole, and the maximum eccentric diameter of the second eccentric hole is smaller than or equal to the maximum eccentric diameter of the first eccentric hole.
Wherein: the axial thickness of the transition hole is 1/5 to 1/6 of that of the first eccentric hole, and the axial thickness of the second eccentric hole is greater than or equal to that of the first eccentric hole.
Wherein: the transition hole is internally provided with a detachable vibration changing piece which is of a disc structure and is provided with a plurality of through changing holes.
Wherein: the static valve body is provided with a liquid outlet below the second eccentric hole.
Wherein: the liquid outlet is provided with a detachable other vibration changing piece which is of a disc structure and is provided with a plurality of changing holes.
From the above, the screw type pulse drag reduction drilling tool of the invention has the following effects:
1. simple structure, the operation is maintained conveniently, effectively overcomes prior art's defect, further improves and bores effect and brill efficiency.
2. Through the valve disc subassembly of special design, improved vibration efficiency promptly, can also effectively avoid holding back the pressure.
The details of the present invention can be found in the following description and the accompanying drawings.
Drawings
Fig. 1 shows a schematic structural diagram of the screw type pulse drag reduction drilling tool of the present invention.
Fig. 2 shows a partial schematic structure of the present invention.
Fig. 3 shows a schematic structural view of another part of the present invention.
FIG. 4 shows a schematic structural view of a valve disc assembly in accordance with one embodiment of the present invention.
FIG. 5 shows a schematic structural view of a valve disc assembly in another embodiment of the present invention.
Description of the drawings:
11. an upper joint; 12. a vibration assembly; 13. a middle joint; 14. a power assembly; 15. a lower joint; 16. a connecting shaft; 17. a movable valve disc; 18. static valve disc; 111. a joint shaft; 121. an outer sleeve; 122. a spring; 123. a piston outer sleeve; 124. a piston; 125. a piston inner sleeve; 141. a power sleeve; 142. a screw stator; 143. and a screw rotor.
Detailed Description
Referring to fig. 1, 2 and 3, the screw type pulse drag reduction drilling tool of the present invention is shown.
The screw type pulse drag reduction drilling tool comprises an upper joint 11, a vibration assembly 12, a middle joint 13, a power assembly 14, a valve disc assembly and a lower joint 15, wherein the lower end of the upper joint 11 extends into and is connected to the upper end of the vibration assembly 12, the lower end of the vibration assembly 12 is connected to the upper end of the middle joint 13 in a threaded manner, the lower end of the middle joint 13 is connected to the upper end of the power assembly 14 in a threaded manner, the lower end of the power assembly 14 is connected to the upper end of the lower joint 15 in a threaded manner, the upper joint 11, the vibration assembly 12 and the middle joint 13 are all provided with through center holes so that high-pressure drilling fluid flows to the power assembly 14, the power assembly 14 comprises a power sleeve 141 and a screw stator 142 fixedly arranged in the power sleeve 141, the upper end and the lower end of the power sleeve are all provided with threads for connection, and screw rotors 143 are arranged in the screw stator 142, thereby, when the high-pressure drilling fluid impacts into the upper joint 11, the lower end of the lower joint 13 from the center holes formed by the vibration assembly 12 and the middle joint 15, the screw rotor 143 is converted into a cavity, the screw rotor 143 is driven by the screw rotor 143, and the screw rotor is connected to the valve disc assembly 16 in a radial direction by the rotation of the screw rotor 16, the screw rotor is connected to the valve disc assembly, the valve disc assembly is connected to the valve disc assembly and the valve disc assembly by the valve disc assembly, and the valve disc assembly is connected to the valve disc assembly in a radial direction, and the valve disc assembly is connected to the valve disc assembly and the valve disc assembly 16 and the valve disc assembly.
In one embodiment of the present invention, as shown in fig. 2, the vibration assembly 12 includes an outer sleeve 121 and an outer sleeve 123 sequentially connected, which may be connected by threads, the lower end of the upper joint 11 has a joint shaft 111 extending into the outer sleeve 121, a spring 122 is disposed between the joint shaft 111 and the outer sleeve 121, the spring 122 may be a belleville spring, an inner sleeve 125 may be disposed in the outer sleeve 123, and a piston 124 capable of moving reciprocally to provide better damping effect is disposed therebetween.
In one embodiment of the present invention, as shown in fig. 1 and fig. 4, the lower joint 15 forms a stepped accommodating cavity with a gradually increasing size from top to bottom on the periphery of the movable valve disc 17, the movable valve disc 17 is disposed in the accommodating cavity, the movable valve disc 17 includes a disc-shaped movable valve body 171, the upper end of the movable valve body 171 may be fixed to the connecting shaft 16 by welding or the like, a part of the periphery of the movable valve body may be rotatably fixed to the inner wall of the lower joint 15 through a bearing element, as shown in fig. 4, a liquid inlet chamber 172 is disposed in the movable valve body 171, a plurality of liquid inlet holes 173 disposed at equal angular intervals are disposed on the peripheral wall of the liquid inlet chamber 172, and a first eccentric hole 174 is disposed below the liquid inlet chamber 172, as shown in fig. 4, the liquid inlet holes 173 are disposed at a certain angle in an inclined manner, and preferably, the liquid inlet holes 173 are disposed at 45 degrees.
The static valve disc 18 comprises a disc-shaped static valve body 181, the center axes of the dynamic valve disc 17 and the static valve disc 18 are overlapped, a second eccentric hole 183 is arranged in the static valve body 181, and the corresponding arrangement of the first eccentric hole 174 and the second eccentric hole 183 enables the dynamic valve disc 17 to generate periodical change of the overflow area when the dynamic valve disc 17 rotates along with the connecting shaft 16 and the screw rotor 143, so that the pressure of high-pressure drilling fluid generates pressure pulses when periodical change of the overflow, and the pressure of the pulses is upwards transmitted into the vibration assembly, so that axial reciprocating vibration is generated under the combined action of the piston and the spring, and axial and circumferential friction is effectively reduced.
Although the direct correspondence between the first eccentric hole 174 and the second eccentric hole 183 can realize the direct change of the pressure periodicity, the arrangement of the structure also has the problems of easy change transition and excessively sharp pressure peak, therefore, the static valve body 181 of the invention is provided with the transition hole 182 above the second eccentric hole 183, the upper end of the transition hole 182 is communicated with the first eccentric hole 174, the lower end is communicated with the second eccentric hole 183, the transition hole 182 is a non-eccentric hole with the diameter larger than or equal to the maximum eccentric diameter of the first eccentric hole 174, the maximum eccentric diameter of the second eccentric hole 183 is smaller than or equal to the maximum eccentric diameter of the first eccentric hole 174, the correspondence of the sizes can be as shown in fig. 4, thereby, through the arrangement of the transition hole 182, the pressure of the high-pressure drilling fluid does not directly act on the transition area of the first eccentric hole 174 and the second eccentric hole 183, so that the problem that the pressure peak value is too sharp is avoided, and in order to avoid energy loss, the thickness of the transition hole 182 is smaller than that of the first eccentric hole 174 and the second eccentric hole 183, preferably, the axial thickness of the transition hole 182 is 1/5 to 1/6 of that of the first eccentric hole 174, and the axial thickness of the second eccentric hole 183 is greater than or equal to that of the first eccentric hole 174, therefore, through the specific arrangement of the structure, the pressure pulse of the two eccentric holes can be realized, the problem that the pulse is too sharp can be effectively avoided, smoother and stable pulse is realized, the vibration efficiency is effectively improved, and the pressure is better avoided.
Preferably, the static valve body 181 is provided with a liquid outlet 184 below the second eccentric hole 183, the upper end of the liquid outlet 184 is communicated to the second eccentric hole 183, the lower end is communicated to the outside of the static valve body 181, the liquid outlet 184 is arranged to better provide liquid flowing out, so that the liquid is prevented from directly discharging directly from the second eccentric hole 183 to the outside, the direct discharging is caused by the relative deflection position of the second eccentric hole, the pressure of the second eccentric hole suddenly decreases to form transitional abrasion to a certain direction in the inner side of the static valve body 181 when the liquid is sprayed out, thus the integral damage and replacement of the static valve body 181 are easily caused, the liquid outlet 184 is arranged to more effectively avoid the problem, the diameter of the liquid outlet 184 is larger than the diameter of the transitional hole 182, the structure can form a liquid output transitional area inside the static valve body 18, the pressure liquid can not directly wash out to the inner wall facing the static valve body, the liquid outlet 184 is used for further discharging, the diameter of the liquid outlet is larger, the spraying pressure reducing effect of the liquid is better avoided, and the inner wall of the static valve body is effectively protected.
In another embodiment of the present invention, as shown in fig. 5, a detachable vibration changing member 185 may be further disposed in the transition hole 182, where the vibration changing member 185 is a disc structure and is provided with a plurality of through changing holes, and the changing holes can change the pressure pulse between the dynamic valve disc and the static valve disc to provide different vibration frequencies and vibration amplitudes, where the changing holes may be disposed on the vibration changing member 185 at equal angular intervals as needed, so that the pressure liquid can increase its vibration amplitude through abrupt change of the sectional area when the pressure pulse is performed from the first eccentric Kong Xiangdi second eccentric hole, and the diameter and the flow area of the changing hole determine the change of the vibration amplitude, so that by setting the vibration changing member, a wider vibration change can be provided for different needs, and only different vibration changing members need to be provided to meet different needs, without providing different static valve discs.
In this embodiment, a detachable further vibration changing member 186 may be provided at the liquid outlet 184, which vibration changing member 186 is likewise of a disk structure, and a plurality of changing holes may be provided, the magnitude and influence of which change is relatively small due to the position of the further vibration changing member 186, only due to the axial thickness influence of the transition hole 182, wherein the thickness and size of the vibration changing member 185 provided therein are also limited, and the changing range can be better provided by the thickness and hole position adjustment of the further vibration changing member when a larger range of adjustment is required.
Wherein the vibration changing member 185 and the other vibration changing member 186 can be detachably coupled and fixed by screw coupling.
Thus, by the arrangement of the above structure, the present invention has the following advantages:
1. the screw rotor and valve disc assembly is simple in structure, convenient to operate and maintain, capable of outputting pressure pulses through the arrangement of the screw rotor and the valve disc assembly, capable of generating axial reciprocating vibration and capable of effectively reducing axial and circumferential friction.
2. The eccentric hole arrangement of the valve disc assembly, and the arrangement of the excessive hole and the liquid outlet can provide wider and stable pulse output, meet wider requirements, further improve the service life of the valve disc assembly and the whole device and reduce the use cost.
It is to be clearly understood that the above description and illustration is made only by way of example and not as a limitation on the disclosure, application or use of the invention. Although embodiments have been described in the embodiments and illustrated in the accompanying drawings, the invention is not limited to the specific examples illustrated by the drawings and described in the embodiments as the best mode presently contemplated for carrying out the teachings of the invention, and the scope of the invention will include any embodiments falling within the foregoing specification and the appended claims.
Claims (6)
1. The utility model provides a screw type pulse drag reduction drilling tool, includes top connection, vibration subassembly, well joint, power component, valve disc subassembly and lower clutch, the lower extreme of top connection stretches into and is connected to the upper end of vibration subassembly, the lower extreme of vibration subassembly is connected to the upper end of well joint, the lower extreme of well joint is connected to the upper end of power component, the lower extreme of power component is connected to the upper end of lower clutch, its characterized in that:
the upper joint, the vibration assembly and the middle joint are provided with through center holes so that high-pressure drilling fluid flows to the power assembly, the power assembly comprises a power sleeve and a screw stator fixedly arranged in the power sleeve, a screw rotor is arranged in a spiral cavity of the screw stator so as to convert the pressure of the high-pressure drilling fluid into rotary motion of the screw rotor, the lower end of the screw rotor is connected to a valve disc assembly through a connecting shaft, and the valve disc assembly comprises a static valve disc fixedly connected in the lower joint and a movable valve disc fixedly connected with the connecting shaft;
the movable valve disc comprises a disc-shaped movable valve body, a liquid inlet chamber is arranged in the movable valve body, a plurality of liquid inlet holes which are arranged at equal angular intervals are formed in the peripheral wall of the liquid inlet chamber, a first eccentric hole is formed below the liquid inlet chamber, the static valve disc comprises a disc-shaped static valve body, the center axes of the movable valve disc and the static valve disc are overlapped, a second eccentric hole is formed in the static valve body, a transition hole is formed in the static valve body above the second eccentric hole, the upper end of the transition hole is communicated with the first eccentric hole, and the lower end of the transition hole is communicated with the second eccentric hole;
the corresponding setting of first eccentric hole and second eccentric hole for move the valve disc and follow connecting axle and when screw rod rotor rotates two eccentric holes produce periodic variation's overflow area, and the transition hole be non-eccentric hole and its diameter is greater than or equal to the maximum eccentric diameter of first eccentric hole, the maximum eccentric diameter of second eccentric hole is less than or equal to the maximum eccentric diameter of first eccentric hole, makes the pressure of high pressure drilling fluid can not directly act on the transition region of first eccentric hole and second eccentric hole, thereby has avoided the too sharp problem of pressure peak, and in order to avoid the loss of energy, the axial thickness of transition hole is 1/5 to 1/6 of first eccentric hole axial thickness, the axial thickness of second eccentric hole is greater than or equal to the axial thickness of first eccentric hole to realize the pressure pulse of two eccentric holes, can also effectively avoid the too sharp problem of pulse, realize more smooth stable pulse, effectively improve vibration efficiency, better hold down pressure.
2. The progressive cavity pulse drag reduction drilling tool of claim 1, wherein: the vibration assembly comprises an outer sleeve and a piston outer sleeve which are sequentially connected, the lower end of the upper joint is provided with a joint shaft which stretches into the outer sleeve, a spring is arranged between the joint shaft and the outer sleeve, a piston inner sleeve is further arranged in the piston outer sleeve, and a piston capable of moving back and forth to provide a drag reduction effect is arranged between the piston inner sleeve and the piston outer sleeve.
3. The progressive cavity pulse drag reduction drilling tool of claim 1, wherein: the lower joint forms a step-shaped accommodating cavity which is gradually increased from top to bottom at the periphery of the movable valve disc, and the movable valve disc is arranged in the accommodating cavity.
4. The progressive cavity pulse drag reduction drilling tool of claim 1, wherein: the upper end of the movable valve body is fixed to the connecting shaft, and a part of the periphery thereof is rotatably fixed to the inner wall of the lower joint through a bearing member.
5. The progressive cavity pulse drag reduction drilling tool of claim 1, wherein: the static valve body is provided with a liquid outlet below the second eccentric hole.
6. The progressive cavity pulse drag reduction drilling tool of claim 5, wherein: the liquid outlet is provided with a detachable other vibration changing piece which is of a disc structure and is provided with a plurality of changing holes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211558140.1A CN115788278B (en) | 2022-12-06 | 2022-12-06 | Screw pulse drag reduction drilling tool |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211558140.1A CN115788278B (en) | 2022-12-06 | 2022-12-06 | Screw pulse drag reduction drilling tool |
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| CN115788278A CN115788278A (en) | 2023-03-14 |
| CN115788278B true CN115788278B (en) | 2023-10-17 |
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| CN202211558140.1A Active CN115788278B (en) | 2022-12-06 | 2022-12-06 | Screw pulse drag reduction drilling tool |
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