CN111119844A - Array water holdup imaging detector based on high-frequency periodic wave phase shift method - Google Patents
Array water holdup imaging detector based on high-frequency periodic wave phase shift method Download PDFInfo
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- CN111119844A CN111119844A CN201911381417.6A CN201911381417A CN111119844A CN 111119844 A CN111119844 A CN 111119844A CN 201911381417 A CN201911381417 A CN 201911381417A CN 111119844 A CN111119844 A CN 111119844A
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- 230000000737 periodic effect Effects 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000003384 imaging method Methods 0.000 title claims abstract description 23
- 230000010363 phase shift Effects 0.000 title claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims description 22
- 239000000523 sample Substances 0.000 claims abstract description 59
- 239000004020 conductor Substances 0.000 claims description 83
- 238000007789 sealing Methods 0.000 claims description 43
- 230000001681 protective effect Effects 0.000 claims description 24
- 230000005284 excitation Effects 0.000 claims description 10
- 239000011159 matrix material Substances 0.000 claims description 10
- 238000009413 insulation Methods 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 238000001514 detection method Methods 0.000 abstract description 7
- 239000007788 liquid Substances 0.000 abstract description 6
- 239000003129 oil well Substances 0.000 abstract description 6
- 238000009434 installation Methods 0.000 abstract description 5
- 238000005259 measurement Methods 0.000 abstract description 4
- 238000011109 contamination Methods 0.000 abstract description 3
- 239000002585 base Substances 0.000 description 42
- 239000000463 material Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
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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
- E21B47/00—Survey of boreholes or wells
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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
- 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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
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Abstract
The invention provides an array water-holding rate imaging detector based on a high-frequency periodic wave phase shift method, wherein a cone-shaped array water-holding rate imaging probe consists of a plurality of cone-shaped spiral probes, a plurality of coaxial four-electrode pressure-bearing bases and a plurality of probe mounting support frames which are of the same number, meets the requirement of accurate detection of the water-holding rate of a liquid production section of a horizontal well of a highly-deviated well, is suitable for domestic low-permeability high-water-content oil wells, and has strong adaptability; compared with a columnar spiral line probe based on an electromagnetic wave phase method, the installation size is small, contamination resistance is realized, and the damage to the manifold of a shaft is small; compared with a capacitance method, the measurement range is improved from 0-50% to 0-100%, the resolution ratio is high, the design requirement of array type instruments suitable for highly deviated wells and horizontal wells can be met, and the method has a wide application prospect.
Description
Technical Field
The invention relates to a logging instrument sensor, in particular to an array water-holding rate imaging detector based on a high-frequency periodic wave phase shift method.
Background
In the field of oil field production logging, the water retention rate of a liquid production profile of a highly deviated well and a horizontal well is related to water shutoff profile control and oil field exploitation scheme adjustment, so that the water retention rate is of great significance in accurate measurement. The liquid production profile detection of the highly deviated well and the horizontal well usually adopts imported instruments which are high in price and limited in measurement range, and the method is not suitable for domestic high-water-content low-permeability oil wells. At present, the domestic water holdup logging instrument comprises an annular capacitance water holdup meter, a 35 capacitance water holdup meter, an annular electromagnetic wave water holdup meter, a microwave water holdup meter and an array capacitance water holdup meter; the instruments are single-probe instruments, the oil-water medium is in laminar flow under the influence of gravity in a highly deviated well and a horizontal well, and the single-probe water-holding rate logging instrument cannot accurately acquire oil-water distribution information of the cross section of the whole shaft; the array capacitance water retention logging instrument has a small detection range, is suitable for high-yield liquid low-water-cut wells, and cannot meet the logging requirements of low-yield liquid high-water-cut horizontal wells in various domestic oil fields.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides an array water retention rate imaging detector based on a high-frequency periodic wave phase shift method, which meets the requirement of accurately detecting the water retention rate of a horizontal well production profile of a highly-deviated well and is suitable for domestic low-permeability high-water-content oil wells.
The invention is realized by the following technical scheme:
an array water holdup imaging detector based on a high-frequency periodic wave phase shift method comprises a plurality of spiral probes, a plurality of coaxial four-electrode pressure-bearing bases and a fixing device, wherein the spiral probes are coaxially arranged on the same circumference and fixed on the fixing device;
the spiral probe comprises a spiral base body, two surface insulation conductors, a four-core pressure-bearing sealing element and a coaxial four-electrode lower plug; the outer surface of the spiral base body is provided with four spiral grooves, each spiral groove is wound from the bottom to the top of the spiral base body, two top wire passing holes are formed in the top of the spiral base body, two of the spiral grooves are communicated through one top wire passing hole, the other two spiral grooves are communicated through the other top wire passing hole, the two surface-insulated conductors are wound from the bottom to the top of the spiral base body along the two spiral grooves, and the two surface-insulated conductors penetrate through the top wire passing holes and then are wound from the top to the bottom of the spiral base body along the other two spiral grooves;
four electrode cores are arranged in the four-core pressure-bearing sealing element, and four ends of the two surface-insulated conductors are correspondingly connected with the four electrode cores one by one; the coaxial four-electrode lower plug is provided with four electrodes, and four electrode cores are correspondingly connected with the four electrodes one by one; four electrode rings are arranged in the coaxial four-electrode pressure-bearing base, and the four electrodes are connected with the four electrode rings in a one-to-one correspondence manner; the four electrode rings are respectively connected with the negative end of the high-frequency periodic wave excitation signal, the positive end of the high-frequency periodic wave excitation signal, the negative end of the signal receiving circuit and the positive end of the signal receiving circuit in a one-to-one correspondence mode.
Preferably, the spiral base body is designed in a conical structure.
Preferably, the four spiral grooves are arranged in parallel at equal intervals, and the axis of the top wire passing hole is vertical to the axis of the spiral base body.
Preferably, the four spiral grooves are respectively a first spiral groove, a second spiral groove, a third spiral groove and a fourth spiral groove, the two top wire passing holes are respectively a first top wire passing hole and a second top wire passing hole, the first spiral groove and the fourth spiral groove are communicated through the first top wire passing hole, and the second spiral groove and the third spiral groove are communicated through the second top wire passing hole; the surface insulated conductors are respectively a first surface insulated conductor and a second surface insulated conductor, the first surface insulated conductor is wound from the bottom to the top of the spiral matrix along the first spiral groove, and is wound to the bottom of the spiral matrix along the fourth spiral groove after passing through the first top wire passing hole; the second surface insulated conductor is wound from the bottom to the top of the spiral base body along the second spiral groove, and is wound to the bottom of the spiral base body along the third spiral groove after passing through the second top wire passing hole.
Preferably, the bottom of the spiral base body is provided with a bottom wire passing hole which is communicated with the four spiral grooves in a one-to-one correspondence manner, and four ends of the two surface insulation conductors respectively penetrate through the bottom wire passing hole to be connected with the four electrode cores in the four-core pressure-bearing sealing element in a one-to-one correspondence manner.
Preferably, the four electrode cores are correspondingly connected with the four electrodes one by one through coaxial single-core shielding wires, the four electrode cores are respectively a first electrode core, a second electrode core, a third electrode core and a fourth electrode core, the four electrodes are respectively a first electrode, a second electrode, a third electrode and a fourth electrode, the coaxial single-core shielding wires are respectively a first single-core shielding wire and a second single-core shielding wire, the first single-core shielding wire is provided with a first single-core shielding wire outer conductor and a first single-core shielding wire inner conductor, and the second single-core shielding wire is provided with a second single-core shielding wire outer conductor and a second single-core shielding wire inner conductor; the first electrode core is connected with the first electrode through a first single-core shielding wire outer conductor, the second electrode core is connected with the second electrode through a first single-core shielding wire inner conductor, the third electrode core is connected with the third electrode through a second single-core shielding wire outer conductor, and the fourth electrode core is connected with the fourth electrode through a second single-core shielding wire inner conductor.
Preferably, the four electrode rings are respectively connected with the negative end of the high-frequency periodic wave excitation signal, the positive end of the high-frequency periodic wave excitation signal, the negative end of the signal receiving circuit and the positive end of the signal receiving circuit in a one-to-one correspondence manner through two single-core shielding wires.
Preferably, the spiral probe further comprises a protective shell and a wire passing pipe; the four-core pressure-bearing sealing element is installed in the protective shell, the bottom of the protective shell is connected with the top of the wire passing pipe, and the bottom of the wire passing pipe is connected with the lower plug of the coaxial four-electrode.
Furthermore, a sealing groove is formed in the outer surface of the four-core pressure-bearing sealing element along the axis, and a sealing ring is arranged in the sealing groove.
Furthermore, the fixing device comprises a plurality of probe mounting support frames, and a spiral probe is mounted on each probe mounting support frame;
the probe mounting support frame comprises an arched spring plate, a wire passing pipe fixing clip and a protective shell fixing clip are arranged on the arched spring plate, the wire passing pipe is fixed in the wire passing pipe fixing clip, and the protective shell is fixed in the protective shell fixing clip.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention provides an array water-holding rate imaging detector based on a high-frequency periodic wave phase shift method, which can meet the requirement of accurate detection of the water-holding rate of the production profile of a highly-deviated well and a horizontal well, is suitable for domestic low-permeability high-water-content oil wells, and has strong adaptability; compared with the traditional capacitance method, the measurement range is improved from 0-50% to 0-100%, and the resolution is improved from 5% to 3.6%. The probe is designed to be quickly plugged and pulled out, is simple and convenient to install, is beneficial to maintenance of later-period instruments, aims to meet accurate detection of the water retention rate of the production profile of the horizontal well with the highly deviated well, is suitable for domestic low-permeability high-water-content oil wells, and has high resolution and strong adaptability. Compared with a columnar spiral line probe based on an electromagnetic wave phase method, the cylindrical spiral line probe is small in installation size, high in resolution ratio, simple in structure, convenient to use and significant in practical significance, and can meet the design requirements of array-type instruments suitable for highly-deviated wells and horizontal wells.
Furthermore, the device adopts a conical structural design, has better anti-contamination and anti-turbulence effects, the volume of the detection head part is 1/2 of a columnar detector, the equivalent waveguide length is increased from 40cm to 80cm, the dynamic range is increased from 7500 to 15000, and the device is suitable for the imaging detection of the liquid production profile of domestic low-liquid-yield high-water-content high-gradient wells and horizontal wells. Compared with a columnar spiral line probe based on an electromagnetic wave phase method, the installation size is small, contamination resistance is realized, and the damage to the flow pattern of a shaft is small.
Furthermore, the arrangement of the protective shell and the wire passing pipe can protect the connecting wires inside the detector and avoid corrosion damage and the like caused by oil stains.
Furthermore, a sealing groove is formed in the four-core pressure-bearing sealing element, and a sealing ring is arranged to realize pressure-bearing sealing.
Drawings
FIG. 1 is a schematic structural view of a spiral base and a quad-core compression seal;
FIG. 2 is a bottom schematic view of a four core pressure containing seal configuration;
FIG. 3 is a schematic view of a wire passing tube, a protective shell and a coaxial four-electrode lower plug structure;
FIG. 4 is a schematic view of a coaxial four-electrode pressure bearing base;
FIG. 5 is a schematic cross-sectional view of a coaxial four-electrode lower plug;
FIG. 6 is a schematic view of a helical probe;
FIG. 7 is a schematic view of a probe mounting support;
FIG. 8 is a schematic view of the spiral probe mounted on the probe support;
FIG. 9 is a top view of a 12-array water holdup imaging detector composed of a spiral probe and a probe mounting support frame.
In fig. 1: 101-top wire through hole, 102-spiral groove, 103-bottom wire through hole, 104-four-core pressure bearing sealing element and 105-sealing groove;
in fig. 2: 201-first electrode core, 202-second electrode core, 203-third electrode core, 204-fourth electrode core;
in fig. 3: 305-coaxial four-electrode lower plug, 301-first electrode, 302-second electrode, 303-third electrode, 304-fourth electrode, 306-wire passing tube, 307-protective shell, 308-sealing surface, 309-first single-core shielding wire outer conductor, 312-second single-core shielding wire outer conductor, 310-first single-core shielding wire inner conductor, 311-second single-core shielding wire inner conductor;
in fig. 4: 401-coaxial four-electrode pressure-bearing base jack, 402-mounting screw thread, 403-third single-core shielding wire outer conductor, 406-fourth single-core shielding wire outer conductor, 404-third single-core shielding wire inner conductor, 405-fourth single-core shielding wire inner conductor;
in fig. 5: 501-a first electrode ring, 502-a second electrode ring, 503-a third electrode ring, 504-a fourth electrode ring;
in fig. 7: 701-first installation fixed contact, 705-second installation fixed contact, 702-wire passing pipe fixing clip, 703-bow spring plate and 704-protective shell fixing clip.
Detailed Description
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.
Referring to fig. 1 to 6, the array water holding capacity imaging detector based on the high-frequency periodic wave phase shift method includes a plurality of spiral probes 6, a plurality of coaxial four-electrode pressure-bearing bases 4 and a plurality of probe mounting support frames 7. The number of the spiral probes 6, the number of the coaxial four-electrode pressure-bearing bases 4 and the number of the probe mounting support frames 7 are the same, the coaxial four-electrode pressure-bearing base 4 is mounted on each spiral probe 6, and the spiral probe 6 is mounted on each probe mounting support frame 7.
The spiral probe 6 comprises a spiral base body 1, a four-core pressure-bearing sealing element 2, a protective shell, a wire passing pipe and a coaxial four-electrode lower plug. The spiral base body 1 is provided with a surface-insulated conductor. In the embodiment of the invention, the spiral substrate 1 is designed in a conical structure.
Four parallel spiral grooves 102 are arranged on the surface of the cone of the spiral base body 1 and are respectively a first spiral groove, a second spiral groove, a third spiral groove and a fourth spiral groove, the four spiral grooves 102 are arranged in parallel at equal intervals, and each spiral groove 102 is wound from the bottom to the top of the spiral base body 1. The top of the spiral base body 1 is provided with two top wire passing holes, the axis of each top wire passing hole is perpendicular to the axis of the spiral base body 1, and the two top wire passing holes are a first top wire passing hole and a second top wire passing hole respectively. The first spiral groove and the fourth spiral groove are communicated through the first top wire passing hole, and the second spiral groove and the third spiral groove are communicated through the second top wire passing hole. The number of the surface insulated conductors is 2, namely a first surface insulated conductor and a second surface insulated conductor, the first surface insulated conductor is wound from the bottom to the top of the spiral matrix 1 along the first spiral groove, and is wound to the bottom of the spiral matrix 1 from the fourth spiral groove after passing through the first top wire passing hole; and the second surface insulated conductor is wound from the bottom to the top of the spiral base body 1 along the second spiral groove, passes through the second top wire passing hole and is wound to the bottom of the spiral base body 1 through the third spiral groove.
The four-core pressure-bearing sealing element 2 is arranged at the bottom of the spiral base body 1, and four electrode cores, namely a first electrode core 201, a second electrode core 202, a third electrode core 203 and a fourth electrode core 204, are arranged in the four-core pressure-bearing sealing element 2; the four electrode cores are communicated with the four parallel spiral grooves. The bottom of the spiral base body 1 is provided with 4 bottom wire passing holes 103, the 4 bottom wire passing holes 103 are communicated with four spiral grooves in a one-to-one correspondence mode, and four ends of two surface insulation conductors respectively penetrate through one bottom wire passing hole 103 to be connected with four electrode cores in the four-core pressure-bearing sealing element 2 one by one.
The outer surface of the four-core pressure-bearing sealing element 2 is provided with a sealing groove 105, the four-core pressure-bearing sealing element 2 is installed in a protective shell 307, the bottom of the protective shell 307 is connected with the top of a wire through pipe 306 in a welding mode, and the bottom of the wire through pipe 306 is connected with a coaxial four-electrode lower plug 305 in a welding mode. The inside cavity of wire passing pipe 306 can hold 2 single core shielded wires and pass through, has flexibility and can be bent, and the joints of the upper end and the lower end of wire passing pipe 306 can bear pressure. The size of the inner diameter of the protective shell is matched with the outer diameter of the four-core pressure-bearing sealing element 2, the inner wall of the protective shell is a sealing surface, and the protective shell is matched with the sealing groove and the sealing ring in the sealing groove for pressure-bearing sealing.
Four electrodes, namely a first electrode 301, a second electrode 302, a third electrode 303 and a fourth electrode 304, are arranged on the coaxial four-electrode lower plug 305. The lower ends of four electrode cores on the four-core pressure-bearing sealing element 2 are connected with 2 coaxial shielding wires, the shielding wires are arranged in the wire passing pipe 306, and the lower ends of the shielding wires are connected with 4 electrodes on the coaxial four-electrode lower plug 305. The 4 electrodes of the coaxial four-electrode lower plug 305 are made of wear-resistant metal conductor materials, have certain elasticity, and are convenient to be connected with the coaxial four-electrode pressure-bearing base 4 better.
Specifically, the 2 coaxial shielded wires are a first single-core shielded wire having a first single-core shielded wire outer conductor 309 and a first single-core shielded wire inner conductor 310, and a second single-core shielded wire having a second single-core shielded wire outer conductor 312 and a second single-core shielded wire inner conductor 311; the first electrode core 201 is connected with the first electrode 301 through a first single-core shielding wire outer conductor 309, the second electrode core 202 is connected with the second electrode 302 through a first single-core shielding wire inner conductor, the third electrode core 203 is connected with the third electrode 303 through a second single-core shielding wire outer conductor 312, and the fourth electrode core 204 is connected with the fourth electrode 304 through a second single-core shielding wire inner conductor 311.
One end of the coaxial four-electrode pressure-bearing base 4 is provided with a coaxial four-electrode pressure-bearing base jack 401, the other end of the coaxial four-electrode pressure-bearing base 4 is provided with a mounting thread 402, and four electrode rings, namely a first electrode ring 501, a second electrode ring 502, a third electrode ring 503 and a fourth electrode ring 504, are arranged in the coaxial four-electrode pressure-bearing base 4. The upper end of the mounting thread 402 is provided with a sealing groove for mounting a sealing ring, the bottom of the mounting thread is provided with a four-electrode outgoing line, the outgoing line adopts 2 single-core shielding wires which are respectively a third single-core shielding wire and a fourth single-core shielding wire, the third single-core shielding wire is provided with a third single-core shielding wire outer conductor 403 and a third single-core shielding wire inner conductor 404, and the fourth single-core shielding wire is provided with a fourth single-core shielding wire outer conductor 406 and a fourth single-core shielding wire inner conductor 405. One end of a third single-core shielding wire outer conductor 403 is connected with the first electrode ring 501, one end of a third single-core shielding wire inner conductor 404 is connected with the second electrode ring 502, one end of a fourth single-core shielding wire outer conductor 406 is connected with the third electrode ring 503, and one end of a fourth single-core shielding wire inner conductor 405 is connected with the fourth electrode ring 504.
The probe mounting support frame 7 comprises an arched spring plate 703, a first mounting fixed contact 701 and a second mounting fixed contact 705 are respectively arranged at two ends of the arched spring plate 703, and a wire passing pipe fixing clip 702 and a protective shell fixing clip 704 are further arranged on the arched spring plate 703. The probe mounting support frame 7 is made of rigid materials, has good elasticity, can be stretched and bent, and has good wear resistance on the outer surface.
During assembly, two parallel surface-insulated conductors pass through two wire passing holes 103 at the bottom of the spiral base body 1, are wound to the top of the spiral base body 1 along two adjacent spiral grooves 102, penetrate out of the wire passing hole 101 at the top of the top, are wound to the bottom of the spiral base body 1 by two other adjacent spiral grooves, and are led to the bottom of the spiral base body 1 by the other two wire passing holes 103 at the bottom, and four ends of the two surface-insulated conductors are respectively welded with four electrode cores of the four-core pressure-bearing sealing element 2; then, a first electrode core 201 is connected with a first single-core shielding wire outer conductor 309, a second electrode core 202 is connected with a first single-core shielding wire inner conductor 310, a third electrode core 203 is connected with a second single-core shielding wire outer conductor 312, a fourth electrode core 204 is connected with a second single-core shielding wire inner conductor 311, a sealing ring is sleeved outside a four-core pressure-bearing sealing member 2 and is slowly installed in a protective shell 307, wherein the first single-core shielding wire and the second single-core shielding wire penetrate through a wire passing pipe 306 and are connected with a lower plug of a lower coaxial four-electrode, the first single-core shielding wire outer conductor 309 is connected with a first electrode 301, the first single-core shielding wire inner conductor 310 is connected with a second electrode 302, the second single-core shielding wire outer conductor 312 is connected with a third electrode 303, and the second single-core shielding wire inner conductor 311 is connected with a fourth electrode 304; thus, the assembly of the spiral probe 6 is completed; the coaxial four-electrode pressure-bearing base 4 is fixed on a mechanical body of the array electromagnetic wave water holdup instrument through a thread 402, a coaxial four-electrode lower plug 305 at the lower end of the spiral probe 6 is inserted into a coaxial four-electrode pressure-bearing base jack 401, a first electrode 301 is connected with a first electrode ring 501, a second electrode 302 is connected with a second electrode ring 502, a third electrode 303 is connected with a third electrode ring 503, and a fourth electrode 304 is connected with a fourth electrode ring 504; the other end of the third single-core shielded wire outer conductor 403 is connected with the negative end of the high-frequency periodic wave excitation signal, the other end of the third single-core shielded wire inner conductor 404 is connected with the positive end of the high-frequency periodic wave excitation signal, the other end of the fourth single-core shielded wire outer conductor 406 is connected with the negative end of the signal receiving circuit, and the other end of the fourth single-core shielded wire inner conductor 405 is connected with the positive end of the signal receiving circuit.
Referring to fig. 6 to 8, the coaxial four-electrode pressure-bearing base 4 is fixed to the mechanical body of the array electromagnetic wave water retention instrument by the mounting thread 402, after the coaxial four-electrode plug 305 at the lower end of the spiral probe 6 is inserted into the screw 401, the probe mounting support frame 7 is fixed to the outer side of the spiral probe 6 by the first mounting fixed contact 701 and the second mounting fixed contact 705 by using the thread ring and the pressing sleeve, the wire passing pipe 306 is slowly moved to the bow-shaped spring plate 703, the wire passing pipe 306 is placed into the wire passing pipe fixed clip 702, the protective shell 307 is placed into the protective shell fixed clip 704, and the connection mode of the spiral probe 6 and the probe mounting support frame 7 is as shown in fig. 8.
The lantern structure is composed of conical spiral probes, coaxial four-electrode pressure-bearing bases and probe mounting support frames, wherein the conical spiral probes are fixed on one probe mounting support frame and are arranged at equal angles. Referring to fig. 9, for an embodiment, 12 spiral probes 6 and 12 probe mounting supports 7 are mounted on the machine body of the instrument and arranged at intervals of 30 ° along the circumferential direction of the machine body of the instrument to form a tapered 12-array water-holding-rate imaging detector, and the top view of the detector is shown as 9.
In addition, in order to ensure the performance of the detector provided by the invention, the following 3-point requirements are provided:
1. the dielectric constant of the spiral matrix 1 is large enough, the heat resistance is good enough, otherwise the pressure resistance and the insulation of the probe can be affected in the high-temperature environment in the pit;
2. after the surface insulation conductor is wound in the spiral groove of the spiral matrix, the bottom wire passing hole needs to be encapsulated by high-temperature sealing pressure-bearing glue.
3. In order to ensure the consistency of the conical spiral probe, the length and the thickness of the surface insulated conductor wound in the spiral groove are kept consistent;
4. the array water retention rate imaging detector provided by the invention is made of materials which are resistant to acid and alkali corrosion.
The working principle of the detector of the invention is as follows: the dielectric constant of oil is 3, the dielectric constant of water is 80, when the water holding rates are different, the equivalent dielectric constants are different, and the phase shift of the high-frequency periodic wave generated by the probe is in a monotone increasing relation with the equivalent dielectric constant, so that the water holding rate of the oil well can be measured by detecting the phase difference of the high-frequency periodic wave generated at the two ends of the sensor. In order to reduce errors, when the array detector works, high-frequency periodic waves passing through 12 sensors are the same signal source, and a multi-channel distributor is adopted to realize equal-interval time-sharing triggering.
Claims (10)
1. An array water holdup imaging detector based on a high-frequency periodic wave phase shift method is characterized by comprising a plurality of spiral probes (6), a plurality of coaxial four-electrode pressure-bearing bases (4) and a fixing device, wherein the spiral probes (6) are coaxially arranged on the same circumference and fixed on the fixing device, and each spiral probe (6) is provided with one coaxial four-electrode pressure-bearing base (4);
the spiral probe (6) comprises a spiral base body (1), two surface insulation conductors, a four-core pressure-bearing sealing element (2) and a coaxial four-electrode lower plug (305); the outer surface of the spiral base body (1) is provided with four spiral grooves (102), each spiral groove (102) winds from the bottom to the top of the spiral base body (1), the top of the spiral base body (1) is provided with two top wire passing holes (101), two spiral grooves (102) are communicated through one top wire passing hole (101), the other two spiral grooves are communicated through the other top wire passing hole (101), two surface-insulated conductors wind from the bottom to the top of the spiral base body (1) along the two spiral grooves (102), and wind from the top to the bottom of the spiral base body (1) along the other two spiral grooves (102) after passing through the top wire passing holes;
four electrode cores are arranged in the four-core pressure-bearing sealing element (2), and four ends of two surface-insulated conductors are correspondingly connected with the four electrode cores one by one; the coaxial four-electrode lower plug (305) is provided with four electrodes, and four electrode cores are correspondingly connected with the four electrodes one by one; four electrode rings are arranged in the coaxial four-electrode pressure-bearing base (4), and the four electrodes are correspondingly connected with the four electrode rings one by one; the four electrode rings are respectively connected with the negative end of the high-frequency periodic wave excitation signal, the positive end of the high-frequency periodic wave excitation signal, the negative end of the signal receiving circuit and the positive end of the signal receiving circuit in a one-to-one correspondence mode.
2. The array water-holding capacity imaging detector based on the high-frequency periodic wave phase shift method according to claim 1, characterized in that the spiral matrix (1) is designed in a conical structure.
3. The array water-holding capacity imaging detector based on the high-frequency periodic wave phase shift method according to claim 1, wherein four spiral grooves (102) are arranged in parallel at equal intervals, and the axis of the top wire through hole is perpendicular to the axis of the spiral base body (1).
4. The array water holdup imaging detector based on the high-frequency periodic wave phase shift method according to claim 1, wherein the four spiral grooves (102) are a first spiral groove, a second spiral groove, a third spiral groove and a fourth spiral groove respectively, the two top wire passing holes are a first top wire passing hole and a second top wire passing hole respectively, the first spiral groove and the fourth spiral groove are communicated through the first top wire passing hole, and the second spiral groove and the third spiral groove are communicated through the second top wire passing hole; the surface insulated conductors are respectively a first surface insulated conductor and a second surface insulated conductor, the first surface insulated conductor is wound from the bottom to the top of the spiral matrix (1) along the first spiral groove, and is wound to the bottom of the spiral matrix (1) along the fourth spiral groove after passing through the first top wire passing hole; and the second surface insulated conductor is wound from the bottom to the top of the spiral base body (1) along the second spiral groove, passes through the second top wire passing hole and then is wound to the bottom of the spiral base body (1) along the third spiral groove.
5. The array water holdup imaging detector based on the high-frequency periodic wave phase shift method according to claim 1, characterized in that (4) bottom wire passing holes (103) are arranged at the bottom of the spiral matrix (1), the (4) bottom wire passing holes (103) are in one-to-one correspondence communication with the four spiral grooves (102), and four ends of two surface-insulated conductors respectively pass through one bottom wire passing hole (103) to be in one-to-one correspondence connection with four electrode cores in the four-core pressure-bearing sealing element (2).
6. The array water-holding capacity imaging detector based on the high-frequency periodic wave phase shift method according to claim 1, the electrode structure is characterized in that four electrode cores are correspondingly connected with four electrodes one by one through (2) coaxial single-core shielding wires, the four electrode cores are respectively a first electrode core (201), a second electrode core (202), a third electrode core (203) and a fourth electrode core (204), the four electrodes are respectively a first electrode (301), a second electrode (302), a third electrode (303) and a fourth electrode (304), the (2) coaxial single-core shielding wires are respectively a first single-core shielding wire and a second single-core shielding wire, the first single-core shielding wire is provided with a first single-core shielding wire outer conductor (309) and a first single-core shielding wire inner conductor (310), and the second single-core shielding wire is provided with a second single-core shielding wire outer conductor (312) and a second single-core shielding wire inner conductor (311); the first electrode core (201) is connected with the first electrode (301) through a first single-core shielding wire outer conductor (309), the second electrode core (202) is connected with the second electrode (302) through a first single-core shielding wire inner conductor, the third electrode core (203) is connected with the third electrode (303) through a second single-core shielding wire outer conductor (312), and the fourth electrode core (204) is connected with the fourth electrode (304) through a second single-core shielding wire inner conductor (311).
7. The array water holdup imaging detector based on the high frequency periodic wave phase shift method according to claim 1, characterized in that four electrode rings are respectively connected with a negative end of a high frequency periodic wave excitation signal, a positive end of the high frequency periodic wave excitation signal, a negative end of a signal receiving circuit and a positive end of the signal receiving circuit in a one-to-one correspondence manner through two single-core shielding wires.
8. The array water-holding rate imaging detector based on the high-frequency periodic wave phase shift method according to claim 1, wherein the spiral probe (6) further comprises a protective shell (307) and a wire through pipe (306); the four-core pressure-bearing sealing element (2) is arranged in a protective shell (307), the bottom of the protective shell (307) is connected with the top of a wire passing pipe (306), and the bottom of the wire passing pipe (306) is connected with a coaxial four-electrode lower plug (305).
9. The array water-holding-rate imaging detector based on the high-frequency periodic wave phase shift method according to claim 8, characterized in that a sealing groove (105) is formed in the outer surface of the four-core pressure-bearing sealing element (2) along the axis, and a sealing ring is arranged in the sealing groove (105).
10. The array water-holding rate imaging detector based on the high-frequency periodic wave phase shift method according to claim 8, characterized in that the fixing device comprises a plurality of probe mounting support frames (7), and each probe mounting support frame (7) is provided with a spiral probe (6);
the probe mounting support frame (7) comprises an arched spring plate (703), a wire passing pipe fixing clip (702) and a protective shell fixing clip (704) are arranged on the arched spring plate (703), the wire passing pipe (306) is fixed in the wire passing pipe fixing clip (702), and the protective shell (307) is fixed in the protective shell fixing clip (704).
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Cited By (1)
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| CN114753829A (en) * | 2022-03-26 | 2022-07-15 | 西南石油大学 | Novel method for calculating water holdup of horizontal well based on array holdup instrument |
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| CN114753829B (en) * | 2022-03-26 | 2024-05-24 | 西南石油大学 | Novel method for calculating water holdup of horizontal well based on array holdup meter |
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