CN106246174A - A kind of column specific retention detection probe based on electromagnetic wave - Google Patents
A kind of column specific retention detection probe based on electromagnetic wave Download PDFInfo
- Publication number
- CN106246174A CN106246174A CN201610663697.XA CN201610663697A CN106246174A CN 106246174 A CN106246174 A CN 106246174A CN 201610663697 A CN201610663697 A CN 201610663697A CN 106246174 A CN106246174 A CN 106246174A
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- China
- Prior art keywords
- detection probe
- electromagnetic wave
- helicla flute
- columnar water
- spiral
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000000523 sample Substances 0.000 title claims abstract description 35
- 238000001514 detection method Methods 0.000 title claims abstract description 30
- 230000014759 maintenance of location Effects 0.000 title abstract 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 31
- 239000004020 conductor Substances 0.000 claims description 22
- 239000011810 insulating material Substances 0.000 claims description 2
- 238000009434 installation Methods 0.000 abstract description 3
- 238000010276 construction Methods 0.000 abstract 1
- 238000000465 moulding Methods 0.000 abstract 1
- 238000007789 sealing Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Classifications
-
- 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
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
- E21B49/08—Obtaining fluid samples or testing fluids, in boreholes or wells
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (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)
- Measurement And Recording Of Electrical Phenomena And Electrical Characteristics Of The Living Body (AREA)
Abstract
The invention discloses a kind of column specific retention detection probe based on electromagnetic wave, including bottom mounting seat, four directions locking post and the helicla flute cylinder of integrated molding from bottom to top；Wherein, offer in the circumference of bottom mounting seat for locking, with electromagnetic wave retention rate instrument housing, the external screw thread being connected, 6 T-shaped helicla flutes be arrangeding in parallel are offered in the circumference of helicla flute cylinder, the center of bottom mounting seat and four directions locking post offered line block installing hole, T-shaped helicla flute one end is connected with crossing line block installing hole by 6 the oblique cable-through holes offered in circumference bottom helicla flute cylinder, the corresponding connection two-by-two of the horizontal cable-through hole of 3 horizontal parallel that the T-shaped helicla flute other end is offered by helicla flute cylinder top.The column specific retention detection probe that the present invention provides, its installation dimension is little, and resolution is high, it is possible to meet the design requirement of the array instrument being applicable to high angle hole and horizontal well, simple in construction, easy to use, and practical significance is great.
Description
The technical field is as follows:
the invention relates to a columnar water holdup detection probe based on electromagnetic waves, which is used for a detector of a water holdup instrument in the field of oil exploration logging.
Background art:
in the field of petroleum production logging instruments, the invention relates to an instrument for logging by utilizing the relationship between the phase shift of electromagnetic waves and the mixing ratio of underground oil and water; in the production logging instrument, a common probe is a coaxial electromagnetic wave phase method probe, the size of the probe is large due to the limitation of the measurement mode of the probe and the proportional relation of an inner conductor and an outer conductor, the existing structure cannot meet the array measurement requirements of a highly-deviated well and a horizontal well, the equivalent length of the probe is short, and the resolution ratio is low.
The invention content is as follows:
the invention aims to improve the resolution of a detector, increase the detection depth and reduce the volume of the detector, and provides a columnar spiral line probe based on an electromagnetic wave phase method, which has small installation size and high resolution, can meet the design requirements of array-type instruments suitable for highly-deviated wells and horizontal wells, and has the advantages of simple structure, convenience in use and great practical significance.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme:
a columnar water holding rate detection probe based on electromagnetic waves comprises a bottom mounting seat, a square locking column and a spiral groove column body which are integrally formed from bottom to top; wherein,
offer the external screw thread that is used for with electromagnetic wave water holdup instrument casing locking connection in the circumference of bottom mount pad, offer 6 parallel arrangement's T type helicla flute in the circumference of helicla flute cylinder, the center department of bottom mount pad and cubic locking post has seted up line piece mounting hole, 6 oblique line holes and the intercommunication of line piece mounting hole are crossed to T type helicla flute one end through seting up in helicla flute cylinder bottom circumference, two liang of corresponding intercommunications in 3 level parallel's levels that the helicla flute cylinder top was seted up are crossed to the T type helicla flute other end.
The invention is further improved in that a first shaft shoulder is arranged between the bottom mounting seat and the square locking column.
The invention is further improved in that a sealing ring mounting groove is also formed between the bottom mounting seat and the first shaft shoulder.
The invention is further improved in that a second shaft shoulder is arranged between the square locking column and the spiral groove column body.
The invention is further improved in that the top of the spiral groove cylinder is in a cone shape.
The invention has the further improvement that the wire passing block also comprises 6 wire passing holes which are uniformly arranged in the wire passing block along the circumferential direction parallel to the axis of the wire passing block, and the wire passing block is arranged in the wire passing block mounting hole during working.
The invention has the further improvement that in work, 3 spiral conductors pass through 3 wire passing holes, are led out from 3 oblique wire passing holes, are wound in 3T-shaped spiral grooves, are led out from 3 horizontal wire passing holes, are wound in the other 3T-shaped spiral grooves and finally pass through the other 3 wire passing holes to be led out, wherein one end of each of the 3 spiral conductors is connected with the transmitting end of the transmitting and receiving circuit, and the other end of each of the 3 spiral conductors is connected with the receiving end of the transmitting and receiving circuit.
The invention is further improved in that the columnar water holding rate detection probe is made of high-temperature-resistant and high-pressure-resistant insulating materials.
The invention is further improved in that 6T-shaped spiral grooves which are arranged in parallel are arranged at equal intervals.
Compared with the prior art, the columnar water retention rate detection probe based on the electromagnetic waves provides a new technical support for industrial section water retention rate measurement of highly deviated wells and horizontal wells, and lays a foundation for design of array imaging instruments. The volume is 1/10 of the coaxial detector, the effective length is 3 times of the coaxial detector, the dynamic range is increased from 240 to 810, and the detection depth and the resolution are both obviously improved.
Description of the drawings:
FIG. 1 is a schematic structural diagram of a columnar water holding capacity detection probe;
FIG. 2 is a schematic structural diagram of a wire passing block;
FIG. 3 is a schematic bottom view of a cylindrical water holdup detection probe;
fig. 4 is a schematic connection diagram of a columnar water holding capacity detection probe.
In the figure: 1-a bottom mounting seat, 2-a sealing ring mounting groove, 3-a first shaft shoulder, 4-a square locking column, 5-a second shaft shoulder, 6-a spiral groove column body, 7-a wire passing block and 8-a spiral conductor;
101-line-passing block mounting hole, 601-oblique line-passing hole, 602-T-shaped spiral groove, 603-horizontal line-passing hole and 701-line-passing hole.
The specific implementation mode is as follows:
the present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1 to 3, the invention provides a columnar water holding rate detection probe based on electromagnetic waves, which comprises a bottom mounting seat 1, a square locking column 4 and a spiral groove column 6 which are integrally formed from bottom to top; wherein, offer the external screw thread that is used for being connected with electromagnetic wave water holdup instrument casing locking in the circumference of bottom mount pad 1, offer 6 parallel arrangement's T type helicla flute 602 in the circumference of helicla flute cylinder 6, line piece mounting hole 101 has been seted up in the center department of bottom mount pad 1 and cubic locking post 4, 6 oblique line holes 601 and the line piece mounting hole 6 intercommunication of crossing that set up in the circumference of helicla flute cylinder 6 bottom are passed through to T type helicla flute 602 one end, two liang of corresponding intercommunications of 3 level parallel levels that the top was seted up is passed through helicla flute cylinder 6 to the T type helicla flute 602 other end. Wherein, still be provided with first shaft shoulder 3 between bottom mount pad 1 and the four directions locking post 4, still seted up sealing washer mounting groove 2 between bottom mount pad 1 and the first shaft shoulder 3, the seal groove is used for installing the sealing washer to ensure the isolation of interior storehouse of water holdup instrument and external high temperature high pressure environment. A second shaft shoulder 5 is also arranged between the square locking column 4 and the spiral groove column body 6. The square locking column 4 is a square column structure designed on the columnar water holding rate detection probe, and is convenient for the clamp to exert force when the columnar water holding rate detection probe is installed. The external thread on the circumferential direction of the bottom mounting seat is used for locking and connecting the columnar water holdup detection probe and the shell of the electromagnetic wave water holdup instrument. The spiral conductor 8 is made of a good conductor with an insulated surface, and the spiral conductor 8 is installed in the T-shaped spiral groove 602, and the conductor is higher than the surface of the cylinder after installation.
During working, the processed spiral conductors 8 are arranged in the T-shaped spiral groove 602, and the spiral conductors 8 are communicated with each other in pairs at the top of the columnar structure through 3 parallel horizontal wire passing holes 603; the spiral conductor 8 penetrates through 6 oblique wire passing holes 601 corresponding to the T-shaped spiral groove 602 at the lower end of the columnar structure, converges in the wire passing hole 701 of the wire passing block 7 installed at the tail end of the columnar base body, and is led out from the wire passing hole 701 of the wire passing block 7. Inserting the tail ends of the 6 spiral conductors into one end of each of the 6 wire passing holes of the wire passing block respectively, leading the 6 conductors out of the other end of each wire passing hole at a slow and uniform speed, pulling the tail ends of the spiral wires of the 6 conductors to keep the tail ends parallel, and slowly pushing the wire passing holes into mounting holes in the bottom of the columnar substrate; referring to fig. 4, 3 spiral connections are connected to the transmit and receive circuitry via coaxial radio frequency lines.
In addition, in order to ensure the performance of a good columnar water holding rate detection probe, the following 3-point requirements are provided:
1. the thermal expansion coefficient of the material of the spiral conductor 8 is basically consistent with that of the columnar water holding rate detection probe, and the material has good ductility;
2. the mechanical structure of each T-shaped spiral groove, including the assembly form and position tolerance, has high consistency requirements.
3. The T-shaped spiral groove on the columnar water holdup detection probe is smooth and free of burrs, the spiral conductor is ensured to be completely installed in the T-shaped spiral groove, and the spiral conductor is in close contact with the bottom of the T-shaped spiral groove;
4. the material of the columnar water holding rate detection probe is resistant to high temperature, high pressure, acid and alkali corrosion.
Claims (9)
1. A columnar water holding rate detection probe based on electromagnetic waves is characterized by comprising a bottom mounting seat (1), a square locking column (4) and a spiral groove column body (6) which are integrally formed from bottom to top; wherein,
offer the external screw thread that is used for being connected with electromagnetic wave water holdup instrument casing locking in the circumference of bottom mount pad (1), offer 6 parallel arrangement's T type helicla flute (602) in the circumference of helicla flute cylinder (6), the center department of bottom mount pad (1) and cubic locking post (4) has seted up line piece mounting hole (101), 6 oblique line holes (601) and the intercommunication of line piece mounting hole (6) of crossing that set up in the circumference of bottom mount pad (6) are passed through to T type helicla flute (602) one end, two liang of correspondence intercommunication in 3 level parallel's level line hole (603) that the spiral flute cylinder (6) top was seted up are passed through to T type helicla flute (602) other end.
2. The electromagnetic wave-based columnar water holdup detection probe as recited in claim 1, wherein a first shaft shoulder (3) is further disposed between the bottom mounting seat (1) and the square locking column (4).
3. The electromagnetic wave-based columnar water holdup detection probe as recited in claim 2, wherein a seal ring mounting groove (2) is further formed between the bottom mounting seat (1) and the first shaft shoulder (3).
4. The electromagnetic wave-based columnar water holding capacity detection probe as recited in claim 2, characterized in that a second shoulder (5) is further disposed between the square locking column (4) and the spiral groove column (6).
5. The electromagnetic wave-based columnar water retention rate detection probe as recited in claim 1, wherein the top of the spiral groove cylinder (6) is cone-shaped.
6. The electromagnetic wave-based columnar water holdup detection probe as claimed in claim 1, further comprising a wire passing block (7), wherein 6 wire passing holes (701) are uniformly formed in the wire passing block (7) along the circumferential direction parallel to the axis of the wire passing block, and during operation, the wire passing block (7) is arranged in the wire passing block mounting hole (101).
7. The electromagnetic wave-based columnar water holdup detection probe according to claim 6, wherein in operation, 3 spiral conductors (8) are led out from 3 oblique wire holes (601) after passing through 3 wire holes (701), wound in 3T-shaped spiral grooves (602), led out from 3 horizontal wire holes (603), wound in the other 3T-shaped spiral grooves (602), and finally led out through the other 3 wire holes (701), wherein one end of each of the 3 spiral conductors (8) is connected with a transmitting end of a transmitting and receiving circuit, and the other end of each of the 3 spiral conductors is connected with a receiving end of the transmitting and receiving circuit.
8. The electromagnetic wave-based columnar water holding capacity detection probe as claimed in claim 1, wherein the columnar water holding capacity detection probe is made of a high temperature and high pressure resistant insulating material.
9. The electromagnetic wave-based cylindrical water holding capacity detecting probe of claim 1, wherein 6 parallel T-shaped spiral grooves (602) are arranged at equal intervals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610663697.XA CN106246174B (en) | 2016-08-12 | 2016-08-12 | A kind of column specific retention detection probe based on electromagnetic wave |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610663697.XA CN106246174B (en) | 2016-08-12 | 2016-08-12 | A kind of column specific retention detection probe based on electromagnetic wave |
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| Publication Number | Publication Date |
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| CN106246174A true CN106246174A (en) | 2016-12-21 |
| CN106246174B CN106246174B (en) | 2019-06-11 |
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| CN201610663697.XA Active CN106246174B (en) | 2016-08-12 | 2016-08-12 | A kind of column specific retention detection probe based on electromagnetic wave |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107654226A (en) * | 2017-08-23 | 2018-02-02 | 中国石油天然气股份有限公司 | Water content meter for underground use |
| CN110578512A (en) * | 2019-08-29 | 2019-12-17 | 长江大学 | Transmission line sensor and array type water holdup detection instrument |
| CN111119844A (en) * | 2019-12-27 | 2020-05-08 | 中国石油天然气集团有限公司 | Array water holdup imaging detector based on high-frequency periodic wave phase shift method |
Citations (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1233789A (en) * | 1967-11-07 | 1971-05-26 | ||
| CN2122934U (en) * | 1992-06-03 | 1992-11-25 | 华北石油管理局测井公司 | High-frequency electromagnetic oscillating water-holding ratio instrument |
| US5168240A (en) * | 1991-08-12 | 1992-12-01 | Simmonds Precision Products, Inc. | Capacitive fluid presence detector for gas pipe using an excited wire loop |
| CN1088683A (en) * | 1992-12-25 | 1994-06-29 | 大庆石油管理局生产测井研究所 | High-precision high moisture content aqueous ratio meter |
| CN2251723Y (en) * | 1995-06-22 | 1997-04-09 | 大庆石油管理局油田建设设计研究院 | Intelligence helical capacitance type detector for testing water-in-oil |
| CN1208872A (en) * | 1997-07-15 | 1999-02-24 | Eta草图制造公司 | Motor coil for timepiece |
| CN1252525A (en) * | 1998-10-27 | 2000-05-10 | 赫罗伊斯电气-耐特国际有限公司 | Immersed detecting and controlling needle for liquid detection |
| CN2718223Y (en) * | 2004-07-12 | 2005-08-17 | 大庆油田有限责任公司 | Electromagnetic induction water-cut sensor |
| CN101167147A (en) * | 2005-12-26 | 2008-04-23 | 丰田自动车株式会社 | Winding method and coil unit |
| CN201464564U (en) * | 2009-06-23 | 2010-05-12 | 成都必控科技股份有限公司 | Helical rod electric field probe |
| CN102007675A (en) * | 2008-04-17 | 2011-04-06 | 伊尔莫泰克斯塔托马特销售有限公司 | Stator or rotor for electrical machines, and method for its production |
| CN202621004U (en) * | 2012-06-25 | 2012-12-26 | 柳新波 | Water curtain type air purifier |
| CN203133022U (en) * | 2013-03-06 | 2013-08-14 | 中南大学 | Tester for water content in concrete |
| GB2504214A (en) * | 2012-07-12 | 2014-01-22 | Midland Corrosion Services Ltd | Crevice corrosion sensor |
| CN204129002U (en) * | 2014-09-29 | 2015-01-28 | 中国石油天然气股份有限公司 | portable crude oil moisture measuring tool |
| CN104854452A (en) * | 2012-10-22 | 2015-08-19 | M-弗洛科技有限责任公司 | Fluid sensor comprising a composite cavity member |
| CN205015297U (en) * | 2015-10-13 | 2016-02-03 | 江苏麦赫物联网科技有限公司 | Utilize oily trace moisture detection device of microwave |
-
2016
- 2016-08-12 CN CN201610663697.XA patent/CN106246174B/en active Active
Patent Citations (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1233789A (en) * | 1967-11-07 | 1971-05-26 | ||
| US5168240A (en) * | 1991-08-12 | 1992-12-01 | Simmonds Precision Products, Inc. | Capacitive fluid presence detector for gas pipe using an excited wire loop |
| CN2122934U (en) * | 1992-06-03 | 1992-11-25 | 华北石油管理局测井公司 | High-frequency electromagnetic oscillating water-holding ratio instrument |
| CN1088683A (en) * | 1992-12-25 | 1994-06-29 | 大庆石油管理局生产测井研究所 | High-precision high moisture content aqueous ratio meter |
| CN2251723Y (en) * | 1995-06-22 | 1997-04-09 | 大庆石油管理局油田建设设计研究院 | Intelligence helical capacitance type detector for testing water-in-oil |
| CN1208872A (en) * | 1997-07-15 | 1999-02-24 | Eta草图制造公司 | Motor coil for timepiece |
| CN1252525A (en) * | 1998-10-27 | 2000-05-10 | 赫罗伊斯电气-耐特国际有限公司 | Immersed detecting and controlling needle for liquid detection |
| CN2718223Y (en) * | 2004-07-12 | 2005-08-17 | 大庆油田有限责任公司 | Electromagnetic induction water-cut sensor |
| CN101167147A (en) * | 2005-12-26 | 2008-04-23 | 丰田自动车株式会社 | Winding method and coil unit |
| CN102007675A (en) * | 2008-04-17 | 2011-04-06 | 伊尔莫泰克斯塔托马特销售有限公司 | Stator or rotor for electrical machines, and method for its production |
| CN201464564U (en) * | 2009-06-23 | 2010-05-12 | 成都必控科技股份有限公司 | Helical rod electric field probe |
| CN202621004U (en) * | 2012-06-25 | 2012-12-26 | 柳新波 | Water curtain type air purifier |
| GB2504214A (en) * | 2012-07-12 | 2014-01-22 | Midland Corrosion Services Ltd | Crevice corrosion sensor |
| CN104854452A (en) * | 2012-10-22 | 2015-08-19 | M-弗洛科技有限责任公司 | Fluid sensor comprising a composite cavity member |
| CN203133022U (en) * | 2013-03-06 | 2013-08-14 | 中南大学 | Tester for water content in concrete |
| CN204129002U (en) * | 2014-09-29 | 2015-01-28 | 中国石油天然气股份有限公司 | portable crude oil moisture measuring tool |
| CN205015297U (en) * | 2015-10-13 | 2016-02-03 | 江苏麦赫物联网科技有限公司 | Utilize oily trace moisture detection device of microwave |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107654226A (en) * | 2017-08-23 | 2018-02-02 | 中国石油天然气股份有限公司 | Water content meter for underground use |
| CN110578512A (en) * | 2019-08-29 | 2019-12-17 | 长江大学 | Transmission line sensor and array type water holdup detection instrument |
| CN110578512B (en) * | 2019-08-29 | 2023-08-18 | 长江大学 | Transmission line sensor and array type water holdup detecting instrument |
| CN111119844A (en) * | 2019-12-27 | 2020-05-08 | 中国石油天然气集团有限公司 | Array water holdup imaging detector based on high-frequency periodic wave phase shift method |
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| CN106246174B (en) | 2019-06-11 |
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