CN1140773C - Exciting part offsetting method and electromagnetic flow rate sensor - Google Patents
Exciting part offsetting method and electromagnetic flow rate sensor Download PDFInfo
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- CN1140773C CN1140773C CNB001129309A CN00112930A CN1140773C CN 1140773 C CN1140773 C CN 1140773C CN B001129309 A CNB001129309 A CN B001129309A CN 00112930 A CN00112930 A CN 00112930A CN 1140773 C CN1140773 C CN 1140773C
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- flow transducer
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Abstract
The present invention provides a method for offsetting and installing an excitation component of an electromagnetic flow sensor and an electromagnetic flow sensor prepared by adopting the method. The excitation component is arranged outside a measuring cross section which is composed of a magnetic pole and an electrode, and is parallelly moved away from the measuring cross section. In another method, the excitation component is moved away, is rotated for 90 DEG, and is perpendicular to the measuring cross section. The present invention can improve surface field intensity produced by the electromagnetic flow sensor with a small diameter for about 10 times, can meet the measurement requirements of downhole water injection flow rate of a petroleum well, and can measure the flow value of different depth positions of the whole well.
Description
The present invention relates to the outer flow passage formula underground electromagnetic flow sensor field of oil-field flooding flow measurement.
The underground water-injection flow measurement of oil well requires to measure the flow value of complete and different depth locations, the i.e. flow value of different depth " measurement section ".For the underground electromagnetic flow sensor, its magnetic pole, the residing plane of electrode are exactly " the measurement section " to the flow value sensitivity.
The weakness of existing outer flow passage formula subsurface flowmeter is that driving magnetic field intensity is low, and transducer sensitivity is low.The outer flow passage formula flowmeter that BrP (GB2256490A) proposes, its " Surface field intensity representative value is 6 Gausses ".Because the field intensity (hundreds of Gauss) that this magnetic field intensity adopts far below the design of unidimensional ground in-flow electromagnetic flowmeter makes the flow measurement signal amplitude of subsurface flowmeter very little, noise is big, and zero point drift is big.The reason that magnetic field intensity is on the low side is subsurface flowmeter external diameter little (φ 38mm), the cavity size that sensor can be used little (high pressure resistant strong instrument cavity≤φ 30mm).Existing subsurface flowmeter all designs (BrP GB2256490A in same instrument section with the shielding between field coil, field core, magnetic pole, potential electrode, driver unit and measurement component; Chinese patent application 97107334.1), because the open ended field coil number of turns is few, the field core sectional area is little, can only produce very weak outside field intensity, so measuring accuracy is not high.
The object of the present invention is to provide the method for outer flow passage formula electromagnetic flow transducer field coil and field core (below be collectively referred to as exciting part) offsetting and adopt the electromagnetic flow transducer of this method preparation.
Adopt the present invention, make and descend electromagnetic flow transducer under little outside dimension (φ 38mm) condition, can produce stronger magnetic field, adopt the offsetting exciting part field intensity can be improved about 10 times, the overall technology performance of subsurface flowmeter is significantly improved.
The method of excitation offsetting of the present invention is that the exciting part with electromagnetic flow transducer is arranged on beyond the measurement section that magnetic pole, electrode constitute.A kind of is that this measurement section setting is left in the exciting part translation; Another kind is that exciting part is removed and half-twist, measures the section setting perpendicular to this.
Adopt the electromagnetic flow transducer of excitation offsetting method preparation of the present invention, the exciting part translation is left measured the section setting, can constitute the electromagnetic flow transducer of translation biasing excitation.It comprises field coil, field core, two or two groups of opposite poles, the number of electrodes that equates with number of magnetic poles.
Adopt the electromagnetic flow transducer of excitation offsetting method of the present invention preparation, with the exciting part half-twist and shift out and measure the section setting, can constitute the electromagnetic flow transducer of vertical off setting excitation.It comprises field coil, field core, two or two groups of opposite poles, the number of electrodes that equates with number of magnetic poles.
The present invention is described in further detail with reference to the accompanying drawings below.
Fig. 1 is the working state schematic representation of outer flow passage formula electromagnetic flowmeter in water injection well;
Fig. 2 is the electromagnetic flow transducer magnetic excitation circuit and the electrode position synoptic diagram of translation biasing excitation of the present invention;
Fig. 3 is the electromagnetic flow transducer A-A flow measurement cross section place synoptic diagram among Fig. 2;
Fig. 4 is the electromagnetic flow transducer B-B exciting part cross section place synoptic diagram among Fig. 2;
Fig. 5 the present invention is the electromagnetic flow transducer magnetic excitation circuit and the electrode position synoptic diagram of vertical off setting excitation;
Fig. 6 is the electromagnetic flow transducer A-A flow measurement part cross section place synoptic diagram among Fig. 5;
Fig. 7 is the electromagnetic flow transducer B-B exciting part cross section place synoptic diagram among Fig. 5.
5. times centralizer 6. well body sleeve pipes 7. field coils 8. field cores 9. magnetic poles 10. electrodes of centralizer 3. circuit sections, 4. detection sections on 1. rope sockets 2. among Fig. 1
Fig. 1 is the working state schematic representation of outer flow passage formula electromagnetic flowmeter in water injection well that adopts the present invention's preparation.It comprises circuit section (3), detection section (4), a rope socket (1), goes up centralizer (2), following centralizer (5).The electromagnetic flow transducer that the present invention proposes is in to be surveyed in the section (4).A-A is the flow measurement section at magnetic pole, electrode place among Fig. 1.The exciting part biasing is provided with structure can make flow measurement section part instrument surface electric field intensity improve an order of magnitude.
" centralizer " (2), (5) at device of the present invention two ends make flowmeter be in the center of well body sleeve pipe (6) among Fig. 1.In the detection section (4) of instrument electromagnetic flow transducer is housed, the magnetic field of sensor magnetic pole is passed the instrument outer wall and is stretched in the fluid.To generate the flow measurement signal that is directly proportional with field intensity B and flow velocity V at the sensor electrical interpolar.
Fig. 2 is magnetic excitation circuit of the present invention and electrode arrangement position view, among Fig. 2 the exciting part translation left and measure the section setting, can constitute the electromagnetic flow transducer of translation biasing excitation, it comprises field coil (7), field core (8), magnetic pole (9), electrode (10).
Fig. 3 is the electromagnetic flow transducer A-A flow measurement cross section place synoptic diagram among Fig. 2; Be provided with a pair of magnetic pole (9) and pair of electrodes (10).The magnetic field that magnetic pole produces is stretched in the outer fluid of sensor.Flowing of fluid will induce the flow measurement signal that is proportional to flow velocity and magnetic field intensity between two electrodes.
Fig. 4 is the electromagnetic flow transducer B-B exciting part cross section place synoptic diagram among Fig. 2; In the end (9) that field coil (7), field core (8) arranged and measure magnetic pole.Because these four parts of flow sensor are separately positioned on two sections, have reduced the space and crowded.Measuring section, the installation of electrode becomes easily, seals reliable.Exciting part after the translation can occupy whole sensor excitation sectional space.The field coil number of turns and iron core cut to amass can both increase several times, and excitation intensity improves.
Fig. 5 is the electromagnetic flow transducer magnetic excitation circuit and the electrode position synoptic diagram of vertical off setting excitation; What Fig. 5 showed is the electromagnetic flow transducer magnetic circuit and the electrode situation of four magnetic poles, four electrodes.With the exciting part half-twist and shift out and measure the section setting, constitute the electromagnetic flow transducer of vertical off setting excitation among Fig. 5.The excitation field direction that produces behind the field coil half-twist is parallel with rate of flow of fluid, must magnetic field be turned to by the soft iron spare of high permeability, and is directed to the measurement magnetic pole.At flow measurement section A-A place, measure magnetic pole and be stretched over magnetic field in the fluid and redirect to vertically with the flow velocity direction, satisfy the requirement of electromagnetic induction measurement flow rate.Adopt this method, the length of field coil can be determined according to the designing requirement of magnetic field intensity, the long-pending restriction that is not subjected to the sensor diameter dimension in the longitudinal cross-section of coil, but coiling more coil number.Thereby it can obtain higher magnetic field intensity than parallel-moving type field coil.
The present invention's electromagnetic flow transducer of excitation structure of setovering is compared with outer flow passage formula electromagnetic flow transducer in the past and is had the following advantages:
1. under the condition of sensor external diameter restriction, the biasing excitation mode can strengthen the bulk that field coil and iron core occupy, and sensitivity is measured thereby improve it in increasing runoff meter work magnetic field.
2. the space isolation of field coil and potential electrode has separately been strengthened in the space of exciting part and measurement section, makes field voltage and the electric current interference reduction to the potential electrode flow signal, can improve measuring accuracy.
3. the excitation mode of setovering can reasonably utilize the interior space dimension of sensor.Thereby, under same process conditions, can design and produce the littler underground electromagnetic flow meter of overall diameter.
Embodiment 1
Fig. 2 is 2 electrodes and 2 pole combination arrangement electromagnetic flow transducer synoptic diagram of the translation biasing excitation that proposes of the present invention.Owing to increased the bulk of exciting part, excitation intensity improves.The typical sensor surface electric field intensity is 40 Gausses.
Embodiment 2:
Fig. 5 is the electromagnetic flow transducer magnetic excitation circuit and the electrode position synoptic diagram of vertical off setting excitation of the present invention; The vertical off setting excitation electromagnetic flow transducer structure situation that has shown 4 electrodes and 4 pole combination.
Fig. 6 is the electromagnetic flow transducer A-A flow measurement part cross section place synoptic diagram among Fig. 5; The A-A sectional drawing shows that it has four magnetic poles (9-1), (9-2), (9-3), (9-4) with four electrodes (10-1), (10-2), (10-3), (10-4).Magnetic pole divides two groups, and two relative magnetic poles are same polarities, and extending with the pure iron soft magnetic material is connected to the same magnetic pole of exciting part.Wherein one group is connected to the exciting part near-end, and another group is connected to the exciting part far-end.
Fig. 7 is the electromagnetic flow transducer B-B exciting part cross section place synoptic diagram among Fig. 5.The B-B sectional drawing shows that it has a columniform field core (8), the periphery is that field coil (7), outermost are to measure magnetic pole (9-1), (9-3) arrives the magnetic field guiding part of exciting part far-end magnetic pole.Can be in actual fabrication with magnetic pole and guiding part with a whole formation.
Another group is measured magnetic pole (9-2), (9-4) will extend to the near-end magnetic pole of exciting part.Can be in actual fabrication with magnetic pole (9-2), (9-4), magnetic field guiding part and field core (8) be with a whole formation.Thereby four magnetic pole sensor magnetic circuits of whole vertical off setting excitation can constitute with two ferromagnetic parts.Four magnetic pole sensor surface electric field intensities of excitation can reach more than 100 Gausses in this way.
The vertical off setting excitation mode also is applicable to and constitutes the multiple different electromagnetic flow transducers that require such as 2 magnetic poles, 6 magnetic poles.
Adopt these two kinds biasing exciting methods, when exciting power was one watt of magnitude, the sensitivity of sensor all can reach 10
-4Volt/(meter per second).
The present invention and BrP (GB2256490A) compare, and implementation result obviously is better than the other side.Two embodiment number of electrodes that the present invention proposes are all identical with number of magnetic poles, 2 electrodes and 2 pole combination (Fig. 2), or 4 electrodes and 4 pole combination (Fig. 5), and its typical sensors sensitivity is 10
-5Volt/(meter per second) is to 10
-4Volt/(meter per second).Several embodiment number of electrodes that this BrP proposes are 2 times or 4 times of number of magnetic poles, and its typical sensors sensitivity only is 10
-9Volt/(meter per second).
Claims (4)
1. the method for an electromagnetic flow transducer exciting part offsetting is characterized in that: the exciting part of electromagnetic flow transducer is arranged on beyond the measurement section that magnetic pole, electrode constitute, this measurement section setting is left in the exciting part translation.
2. the method for an electromagnetic flow transducer exciting part offsetting, it is characterized in that: the exciting part of electromagnetic flow transducer is arranged on beyond the measurement section that magnetic pole, electrode constitute, exciting part is removed and half-twist, measures the section setting perpendicular to this.
3. the electromagnetic flow transducer of the method for claim 1 preparation, it comprises field coil (7), field core (8), it is characterized in that: also comprise two magnetic poles and two electrodes, described field coil (7) and field core (8) are translated apart the measurement section, and described two magnetic poles end separately extends in parallel two end faces of field core (8) respectively.
4. the electromagnetic flow transducer of a method as claimed in claim 2 preparation, it comprises field coil (7), field core (8), it is characterized in that: also comprise magnetic pole and the electrode that equates with the magnetic pole number, the axle of described field coil (7) and field core (8) is perpendicular to measuring section, and leave this section, the two ends of field core (8) are connected to two magnetic poles or four magnetic poles of measuring in the section with high permeability materials spare respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001129309A CN1140773C (en) | 2000-05-15 | 2000-05-15 | Exciting part offsetting method and electromagnetic flow rate sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001129309A CN1140773C (en) | 2000-05-15 | 2000-05-15 | Exciting part offsetting method and electromagnetic flow rate sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1299960A CN1299960A (en) | 2001-06-20 |
| CN1140773C true CN1140773C (en) | 2004-03-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB001129309A Expired - Fee Related CN1140773C (en) | 2000-05-15 | 2000-05-15 | Exciting part offsetting method and electromagnetic flow rate sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1140773C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1770406A4 (en) * | 2004-07-16 | 2010-03-03 | Amosense Co Ltd | Magnetic sensor assembly, geomagnetic sensor, element assembly and portable terminal |
| CN104948168A (en) * | 2015-07-17 | 2015-09-30 | 四川省科学城久利电子有限责任公司 | Improved oilfield downhole electromagnetic flowmeter |
| CN105571660A (en) * | 2015-12-16 | 2016-05-11 | 宁波水表股份有限公司 | Micro-power-consumption excitation electromagnetic flow transducer |
-
2000
- 2000-05-15 CN CNB001129309A patent/CN1140773C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1299960A (en) | 2001-06-20 |
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| AR01 | Abandonment of patent right to avoid double patenting |
According to article 9 of the patent law and article 13 of the detailed rules for the implementation of the patent law: 112930.9 of the invention patents in this issue as a notice of authorization, and at the same time corresponding to the 223017.8 utility model patent to be given up, and in the 20 volume of the 9 issue of the new type of communique on the patent right to abandon the announcement. |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20040303 Termination date: 20180515 |