CN115961943B - While-drilling hole bottom seismic source device - Google Patents
While-drilling hole bottom seismic source device Download PDFInfo
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- CN115961943B CN115961943B CN202211584569.8A CN202211584569A CN115961943B CN 115961943 B CN115961943 B CN 115961943B CN 202211584569 A CN202211584569 A CN 202211584569A CN 115961943 B CN115961943 B CN 115961943B
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- annular cavity
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- 238000005553 drilling Methods 0.000 title claims abstract description 37
- 125000006850 spacer group Chemical group 0.000 claims abstract description 22
- 210000004907 gland Anatomy 0.000 claims abstract description 10
- 239000007788 liquid Substances 0.000 claims abstract description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 14
- 238000007789 sealing Methods 0.000 claims description 12
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 7
- 230000008569 process Effects 0.000 abstract description 7
- 239000012530 fluid Substances 0.000 abstract description 6
- 238000005192 partition Methods 0.000 description 5
- 239000002360 explosive Substances 0.000 description 4
- 230000006872 improvement Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010892 electric spark Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/30—Assessment of water resources
Landscapes
- Earth Drilling (AREA)
Abstract
The invention discloses a seismic source device at the bottom of a drilling hole, which comprises an outer sleeve, a liquid inlet connector arranged at the upper end of the outer sleeve, an inner tube arranged in the outer sleeve, a gland fixed at the upper end of the inner tube and a spacer fixedly inserted into the lower end of the inner tube, wherein an outer annular cavity is formed between the outer sleeve and the inner tube, the seismic source device also comprises a piston which is in sliding fit with the inner tube, the piston comprises a round rod body, an upper spacer ring and a lower spacer ring which are formed on the round rod body, and the round rod body is divided into an upper rod section, a middle rod section and a lower rod section by the upper spacer ring and the lower spacer ring. The vibration source device at the bottom of the hole while drilling can drive the piston to do regular reciprocating motion along the axial direction through drilling fluid, so that a drill bit or a core tube tail connected with the lower end of the outer sleeve is regularly impacted by the piston to send out vibration signals with relatively fixed frequency and high strength, and the technical problem that the vibration signals with relatively fixed frequency and high strength are sent to the ground from the bottom of the hole in real time along with a drill rod in the drilling process is solved.
Description
Technical Field
The invention relates to the technical field of formation drilling detection, in particular to a seismic source device while drilling.
Background
In various engineering drilling holes such as geological drilling, accurate measurement of the depth of the drilling hole, accurate identification of stratum and the like are required. In the prior art, the drilling depth is generally measured by the number of artificial parent point drill rods or the way of plugging iron wires into the drill holes after the drilling is finished, but the detection ways have the technical problems of large workload and low efficiency, and in the formation identification based on the earthquake while drilling, the vibration signal sent by the broken rock of the drill bit is small in energy, so that the applicable hole depth is shallow.
In microseismic exploration, an artificial seismic source is used to carry useful geological information data, and vibration signals propagated through the stratum are acquired through ground detectors. Artificial sources currently in common use in seismic exploration can be divided into two categories, one category being explosive sources and the other category being non-explosive sources. The seismic wave excited by the explosive source has the advantages of good pulse characteristics and high energy, and is a main seismic source for exciting the seismic wave in field oil and gas exploration; the non-explosive source is a falling weight type source, an air explosion source and an electric spark source. However, these artificial sources are not generated in real time during the drilling process following the drill bit. Because the micro-seismic signal generated by cutting and breaking the rock of the drill bit is weak and the ground is difficult to effectively receive, the invention needs to provide a hole-while-drilling seismic source device so as to improve the strength of the seismic source signal, and the seismic source device is used for generating the seismic source signal with higher strength and relatively fixed frequency so as to be beneficial to the signal receiving and post noise filtering treatment of a ground detector.
Disclosure of Invention
Therefore, the present invention is directed to a seismic source device at the bottom of a hole while drilling, so as to solve the technical problem of generating vibration signals with relatively fixed frequency and high intensity in real time along with a drill bit during the drilling process.
The invention relates to a seismic source device at the bottom of a drilling hole, which comprises an outer sleeve, a liquid inlet joint arranged at the upper end of the outer sleeve, an inner pipe arranged in the outer sleeve, a gland fixed at the upper end of the inner pipe and a spacer fixedly inserted into the lower end of the inner pipe, wherein the spacer is fixed in the lower end of the outer sleeve, an outer annular cavity is formed between the outer sleeve and the inner pipe, and a first through hole communicated with the outer annular cavity is arranged on the liquid inlet joint;
The vibration source device at the bottom of the drilling hole further comprises a piston in sliding fit with the inner tube, the piston comprises a round rod body, an upper spacing ring and a lower spacing ring which are formed on the round rod body, the round rod body is divided into an upper rod section, a middle rod section and a lower rod section by the upper spacing ring and the lower spacing ring, the upper end surface area of the lower spacing ring is smaller than the lower end surface area of the lower spacing ring, and the lower rod section is inserted in the spacing sleeve and in sliding sealing fit with an inner hole of the spacing sleeve;
The inner wall of the inner pipe is sequentially provided with a first annular table, a second annular table and a third annular table from top to bottom, the upper rod section penetrates through the first annular table and is in sliding sealing fit with the first annular table, and compressed nitrogen is filled in a closed cavity between the first annular table and the gland; the first annular table and the second annular table divide an inner annular cavity formed between the inner pipe and the piston into an upper annular cavity section, a middle annular cavity section and a lower annular cavity section, the inner pipe is provided with a second through hole for communicating the outer annular cavity section and the middle annular cavity section, and the circular rod body of the piston is provided with a radial hole communicated with the upper annular cavity section and an axial hole connected with the radial hole and penetrating the circular rod body downwards along the axial direction; an axial groove communicated with the lower annular cavity section is formed in the outer side face of the spacer bush, and a radial through hole connected with the lower end of the axial groove is formed in the spacer bush;
When the upper spacing ring of the piston is positioned in the second annular table, the upper annular cavity section and the middle annular cavity section are separated; when the upper spacing ring of the piston is separated from the second annular table, the upper annular cavity section is communicated with the middle annular cavity section; when the lower spacing ring of the piston is positioned in the third annular table, the lower annular cavity section and the middle annular cavity section are separated; when the lower spacer ring of the piston is separated from the third annular table, the lower annular cavity section is communicated with the middle annular cavity section.
Further, a first sealing ring matched with the inner pipe is arranged on the gland, and a second sealing ring matched with the upper rod section is arranged on the inner ring.
Further, the upper end surface area of the upper spacing ring is larger than the lower end surface area of the upper spacing ring.
The invention has the beneficial effects that:
The vibration signal with relatively fixed frequency and high intensity is sent out by regularly striking a drill bit or a core tube tail connected with the lower end of the outer sleeve by the piston, and the technical problem that the vibration signal with relatively fixed frequency and high intensity is sent from the bottom of the drill hole to the ground in real time along with the drill rod in the drilling process is solved.
Drawings
FIG. 1 is a schematic diagram of a source device while drilling.
Fig. 2 is a schematic structural view of the piston.
Fig. 3 is a schematic structural view of the inner tube.
Detailed Description
The invention is further described below with reference to examples.
The seismic source device at the bottom of the drilling hole in the embodiment comprises an outer sleeve 1, a liquid inlet connector 2 arranged at the upper end of the outer sleeve, an inner tube 3 arranged in the outer sleeve, a gland 4 fixed at the upper end of the inner tube and a spacer 5 fixedly inserted into the lower end of the inner tube, wherein the spacer is fixed in the lower end of the outer sleeve, an outer annular cavity 6 is formed between the outer sleeve and the inner tube, and a first through hole 7 communicated with the outer annular cavity is formed in the liquid inlet connector.
The seismic source device at the bottom of the drilling hole further comprises a piston 8 which is in sliding fit with the inner tube, the piston comprises a round rod body, an upper spacing ring 81 and a lower spacing ring 82 which are formed on the round rod body, the round rod body is divided into an upper rod section 83, a middle rod section 84 and a lower rod section 85 by the upper spacing ring and the lower spacing ring, the upper end surface area of the lower spacing ring is smaller than the lower end surface area of the lower spacing ring, and the lower rod section is inserted into the spacing sleeve and is in sliding sealing fit with an inner hole of the spacing sleeve.
The inner wall of the inner pipe 3 is sequentially provided with a first annular table 31, a second annular table 32 and a third annular table 33 from top to bottom, the upper rod section penetrates through the first annular table and is in sliding sealing fit with the first annular table, and compressed nitrogen is filled in a closed cavity 9 between the first annular table and the gland; the first annular table and the second annular table divide an inner annular cavity formed between the inner pipe and the piston into an upper annular cavity section 10, a middle annular cavity section 11 and a lower annular cavity section 12, a second through hole 13 for communicating the outer annular cavity with the middle annular cavity section is formed in the inner pipe, a radial hole 14 for communicating the upper annular cavity section and an axial hole 15 which is connected with the radial hole and penetrates the circular rod body downwards along the axial direction are formed in the circular rod body of the piston; an axial groove 16 communicated with the lower annular cavity section is formed in the outer side face of the spacer, and a radial through hole 17 connected with the lower end of the axial groove is further formed in the spacer.
When the upper spacing ring of the piston is positioned in the second annular table, the upper annular cavity section and the middle annular cavity section are separated; when the upper spacing ring of the piston is separated from the second annular table, the upper annular cavity section is communicated with the middle annular cavity section; when the lower spacing ring of the piston is positioned in the third annular table, the lower annular cavity section and the middle annular cavity section are separated; when the lower spacer ring of the piston is separated from the third annular table, the lower annular cavity section is communicated with the middle annular cavity section.
As an improvement to the above embodiment, the upper end surface area of the upper spacer ring is larger than the lower end surface area thereof. The improvement makes it possible to accelerate the stopping of the upward movement of the piston and the acceleration of the downward movement of the piston by means of the pressure difference across the upper spacer ring.
As a modification of the above embodiment, the gland is provided with a first sealing ring 18 cooperating with the inner tube, and the inner ring is provided with a second sealing ring 19 cooperating with the upper rod section. This improvement has further improved the sealed effect to nitrogen gas, can be better avoid nitrogen gas to reveal.
The working principle of the seismic source device at the bottom of the hole while drilling in the embodiment is as follows:
When the stratum is drilled, the seismic source device at the bottom of the drilling hole is arranged at the front part of the hollow drill rod, drilling fluid is input into the seismic source device at the bottom of the drilling hole through the inner hole of the drill rod in the drilling process, the piston is driven to move up and down regularly and reciprocate through the drilling fluid, and the piston moves up and down to knock a drill bit or the tail of a core tube connected with the lower end of the outer sleeve 1, so that a vibration signal with relatively fixed frequency is sent.
In the process of driving the piston to move upwards, drilling fluid sequentially enters the middle annular cavity section 11 and the lower annular cavity section 12 through the liquid inlet joint 2, the first through hole 7, the outer annular cavity 6 and the second through hole 13, the upper end surface area of the lower partition ring 82 is smaller than the lower end surface area of the lower partition ring, so that the pressure born by the lower end surface of the lower partition ring is larger than the pressure born by the upper end surface, the piston can move upwards under the pressure difference, the piston moves upwards to compress nitrogen in the airtight cavity 9, the pressure in the airtight cavity 9 is increased to store energy, when the piston moves upwards until the lower partition ring 82 enters the third annular platform 33, the middle annular cavity section 11 and the lower annular cavity section 12 are blocked, so that the drilling fluid does not enter the lower annular cavity section 12 any more, but at the moment, the piston still moves upwards under the inertia until the upper partition ring 81 is separated from the second annular platform 32, and in the process of moving upwards, when the lower rod section 85 is separated from the radial through hole 17, liquid in the lower annular cavity section 12 can be discharged through the radial through hole 17, and liquid entering the upper annular cavity section 10 can be discharged through the radial hole 14 and the axial hole 15.
After the piston inertially moves up to the upper spacing ring 81 and is separated from the second annular table 32, the upper annular cavity section is communicated with the middle annular cavity section, at this time, the piston can be rapidly decelerated to 0 under the action of pressure difference between high-pressure nitrogen and two ends of the upper spacing ring, then the piston can turn around and accelerate to move downwards under the action of pressure difference between the high-pressure nitrogen and two ends of the upper spacing ring, and the piston moves downwards to the end part of the lower rod section in an acceleration manner to collide with a drill bit or a core tube tail connected with the lower end of the outer sleeve 1, so that a vibration signal is generated. After one knocking is finished, the piston moves upwards under the drilling fluid pressure, so that the next cycle is started, and a vibration signal with relatively fixed frequency and high intensity can be sent to the ground through the reciprocating cycle.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered by the scope of the claims of the present invention.
Claims (3)
1. A hole bottom while drilling seismic source device, characterized in that: the device comprises an outer sleeve, a liquid inlet connector arranged at the upper end of the outer sleeve, an inner pipe arranged in the outer sleeve, a gland fixed at the upper end of the inner pipe and a spacer fixedly inserted into the lower end of the inner pipe, wherein the spacer is fixed in the lower end of the outer sleeve, an outer annular cavity is formed between the outer sleeve and the inner pipe, and a first through hole communicated with the outer annular cavity is arranged on the liquid inlet connector;
The vibration source device at the bottom of the drilling hole further comprises a piston in sliding fit with the inner tube, the piston comprises a round rod body, an upper spacing ring and a lower spacing ring which are formed on the round rod body, the round rod body is divided into an upper rod section, a middle rod section and a lower rod section by the upper spacing ring and the lower spacing ring, the upper end surface area of the lower spacing ring is smaller than the lower end surface area of the lower spacing ring, and the lower rod section is inserted in the spacing sleeve and in sliding sealing fit with an inner hole of the spacing sleeve;
The inner wall of the inner pipe is sequentially provided with a first annular table, a second annular table and a third annular table from top to bottom, the upper rod section penetrates through the first annular table and is in sliding sealing fit with the first annular table, and compressed nitrogen is filled in a closed cavity between the first annular table and the gland; the first annular table and the second annular table divide an inner annular cavity formed between the inner pipe and the piston into an upper annular cavity section, a middle annular cavity section and a lower annular cavity section, the inner pipe is provided with a second through hole for communicating the outer annular cavity section and the middle annular cavity section, and the circular rod body of the piston is provided with a radial hole communicated with the upper annular cavity section and an axial hole connected with the radial hole and penetrating the circular rod body downwards along the axial direction; an axial groove communicated with the lower annular cavity section is formed in the outer side face of the spacer bush, and a radial through hole connected with the lower end of the axial groove is formed in the spacer bush;
When the upper spacing ring of the piston is positioned in the second annular table, the upper annular cavity section and the middle annular cavity section are separated; when the upper spacing ring of the piston is separated from the second annular table, the upper annular cavity section is communicated with the middle annular cavity section; when the lower spacing ring of the piston is positioned in the third annular table, the lower annular cavity section and the middle annular cavity section are separated; when the lower spacing ring of the piston is separated from the third annular table, the lower annular cavity section is communicated with the middle annular cavity section; when the piston moves upwards until the lower spacer ring enters the third ring table, the piston continues to move upwards to separate the lower rod section from the radial through hole.
2. The hole-while-drilling seismic source device of claim 1, wherein: the gland is provided with a first sealing ring matched with the inner pipe, and the inner ring is provided with a second sealing ring matched with the upper rod section.
3. The hole-while-drilling seismic source device of claim 1, wherein: the upper end surface area of the upper spacing ring is larger than the lower end surface area of the upper spacing ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211584569.8A CN115961943B (en) | 2022-12-09 | 2022-12-09 | While-drilling hole bottom seismic source device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211584569.8A CN115961943B (en) | 2022-12-09 | 2022-12-09 | While-drilling hole bottom seismic source device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115961943A CN115961943A (en) | 2023-04-14 |
| CN115961943B true CN115961943B (en) | 2024-05-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211584569.8A Active CN115961943B (en) | 2022-12-09 | 2022-12-09 | While-drilling hole bottom seismic source device |
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| CN (1) | CN115961943B (en) |
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| Publication number | Publication date |
|---|---|
| CN115961943A (en) | 2023-04-14 |
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