CN201740755U - Capacitance sensor of well mouth crude oil moisture content online measuring device - Google Patents
Capacitance sensor of well mouth crude oil moisture content online measuring device Download PDFInfo
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- CN201740755U CN201740755U CN2010202310090U CN201020231009U CN201740755U CN 201740755 U CN201740755 U CN 201740755U CN 2010202310090 U CN2010202310090 U CN 2010202310090U CN 201020231009 U CN201020231009 U CN 201020231009U CN 201740755 U CN201740755 U CN 201740755U
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Abstract
The utility model discloses a capacitance sensor of a well mouth crude oil moisture content online measuring device which is applied to the well mouth crude oil moisture content online measuring of the single oil producing well of an oil field. Both a conduit tube and a capacitance tube adopt stainless steel capillary tubes; the surface of the capacitance tube is coated with an insulated coating; the distance between the conduit tube and the capacitance tube is 3-6mm; the conduit tube and the capacitance tube are respectively fixed on an electrode seat; a connecting column penetrates a coaxial hole on a substrate wall; the two ends of the heating wires inside the conduit tube and the capacitance tube are respectively connected with a heating wire; the conduit tube and the capacitance tube are respectively connected with the output electrode wire of a measuring capacitance; a hood cylinder is arranged on the upper part of a round transition block; the hood cylinder and the transition block are fixed by a connecting bolt. The capacitance sensor of the well mouth crude oil moisture content online measuring device has the effects of implementing accurate online measuring on the crude oil moisture content in the well mouth, and being capable of meeting the demands of dynamic analysis of the oil well and also meeting the requirements of remote transmission of data. The capacitance sensor of the well mouth crude oil moisture content online measuring device has a high measuring accuracy; the maximum relative deviation of the capacitance sensor of the well mouth crude oil moisture content online measuring device is within a scope plus or minus five percent; moreover, the capacitance sensor of the well mouth crude oil moisture content online measuring device has small online measuring error and higher reliability.
Description
Technical field
The utility model relates to oil recovery technique field, oil field, and particularly a kind of extraction crude oil checkout equipment is a kind of on-line measurement device of crude oil water content capacitive transducer that can be applied to the oil field individual well well head.
Background technology
It is an important process of oil well production that crude oil water content is measured in real time.The measuring object of water percentage is divided into wet oil and dewatered oil again.Existing well mouth of oil well crude oil water content measuring method generally is divided into two kinds, i.e. manual measurement method and on-line measurement method.At present most of what adopt is the hand sampling mensuration for each oil field of wet oil.The hand sampling mensuration according to the difference of oil and water separation means be divided into the way of distillation, electricity takes off method, Ka Er-Fei Xiufa.
The method of on-line measurement is divided into densimetry, rays method, shortwave absorption process, microwave method, capacitance method again.Densimetry is after determining the wet oil density value, according to pure oil density and pure water density calculation water percentage.Rays method is to utilize crude oil different to the receptivity of ray with water, calculates crude oil water content with this.The shortwave absorption process is that electric energy is radiated with form of electromagnetic wave in the oil-water media that exists with emulsified state, according to oil, water the difference of shortwave receptivity is detected water percentage in the oil-water emulsion.The microwave ratio juris be according to oil, water to the difference of the receptivity of microwave energy, adopt microwave reflection formula structure to measure water percentage.
Abroad when the crude oil of measuring than low-water-content, mainly adopt the capacitance method analyzer of water content, this class instrument resolution is higher, and has higher measurement stability, can realize real-time temperature compensation by built-in temperature sensor.When water percentage is higher, then adopt the analyzer of water content of microwave method.These instrument can both be carried out communication and on-line debugging by RS232 port and computing machine substantially, and man-machine interface adopts menu prompt, thereby its debug process is very simple.
The shortcoming of prior art:
The sample time of manual measurement method is longer, can't be used for on-line measurement system and measure in real time, and sampling randomness is big, and personal error is big, wastes time and energy, and can not satisfy the requirement of field produces automatic management.
And the microwave of on-line measurement method and shortwave method are measured the instrument of crude oil water containing, and its measurement can not reflect the situation of mixing two-phase flow comprehensively, thereby measuring accuracy can reach requirement under the laboratory condition, but can not satisfy accuracy requirement under concrete field working conditions condition.Because factors such as Water-In-Oil or oil-in-waters, easily zero point drift takes place and cause measurement range inaccurate, nonlinearity erron is big.Simultaneously, cause the reliability of instrument long-time running relatively poor owing to reasons such as the burn into fouling of crude oil, wax deposition.It is more accurate that the traditional capacitance method is surveyed water percentage, but range ability is little, adjustability is poor, and be only applicable to water percentage and be lower than oil well below 30%.
This shows that lack a kind of with low costly, easy to install, the measuring accuracy height is applicable to oilfield well head moisture percentage measuring apparatus, is the major obstacle of present well mouth of oil well water percentage line Measurement Technique development.
The near patent of class has: a kind of antiwind formula high temperature decentralized wellhead tester (publication number: CN201232546); Two probe sensor (the publication numbers: CN2349574) of a kind of crude oil water content analyzer; Microwave resonance method production well liquid producing profile log instrument (publication number: CN2809215); Water in oil on-line measurement instrument and measurement display device (publication number: CN201016974).
The utility model content
The purpose of this utility model is: a kind of capacitive transducer of on-line measurement device of crude oil water content of wellhead is provided, can real-time online be accurately measured by the crude oil water content of well head, and the measurement range broad.
The technical solution adopted in the utility model is: the capacitive transducer of on-line measurement device of crude oil water content of wellhead mainly is made up of cover tube, transition block, pipe thread nut, joint pin, matrix, electrode tip holder, conduit, capacitance tube, pressing plate, lock-screw and nut.
Conduit and capacitance tube all adopt stainless steel capillary.The capacitance tube surface scribbles insulating coating, and the distance between conduit and the capacitance tube is at 3～6mm.In conduit and the capacitance tube center pit electrical heating wire is arranged all.The two ends of conduit and capacitance tube are separately fixed on the cuboid electrode tip holder made of insulating material.Two electrode tip holders are embedded in respectively in the matrix inboard wall groove and with fluid sealant and carry out embedding.The matrix outer wall is the cylinder bodily form, is slot in the matrix; Matrix lower end inwall is symmetrically distributed with the groove of two mosaic electrode seats.Matrix has four axial holes, and joint pin passes the axial hole on the base wall, is fixed with annular pressing plate in the joint pin bottom by nut.The two ends of heater strip are connected with heating wires respectively in conduit and the capacitance tube; Conduit and capacitance tube are connected with respectively measures electric capacity output electrode lead, and heating wires and measurement electric capacity output electrode lead are drawn by the joint pin center pit.Heating wires and measure electric capacity output electrode lead and be connected on the connection terminal on the circuit board.The upper end of joint pin is passed pipe thread nut and circular transition block and is fixed by nut.Pipe thread nut and circular transition block weld together, and the pipe thread nut is the cylinder bodily form, in the lower end of pipe thread nut external thread is arranged, and the upper end is positive hexahedron.The edge of circular transition block is distributed with screw.The cover tube is arranged on the top of circular transition block, fix by coupling bolt between cover tube and the transition block.
The technology of conduit and capacitance tube and electrical heating wire employing embedding is packaged in the matrix, is processed into the structure of being made of one of integral body encapsulation.
The capacitive transducer of on-line measurement device of crude oil water content of wellhead is installed on the flow line of production wellhead, and particular location is: flow line is connected on the Centronics port and straight port of threeway.On another straight port of threeway, be fixed with capacitive transducer.
The principle of summary capacitive transducer.Consult Fig. 1 a and Fig. 1 b.Capacitive transducer is a contact type measurement, and what contact with measured medium is conduit 7 and capacitance tube 8.The material of conduit 7 and capacitance tube 8 is the 0.6mm stainless-steel tube, adopt double pipe structure, wherein capacitance tube 8 stainless steel pipe surfaces have the uniform dielectric of a layer thickness (insulating coating), constitute the major part of capacitor, conduit 7 is surface uncoated " naked silks ", and its effect is another electrode that constitutes capacitor.An electrical heating wire is all arranged in conduit 7 and the capacitance tube 8.Electrical heating wire provides certain heat for conduit 7 and capacitance tube 8 surfaces, makes surface temperature be higher than the crude oil wax precipitation piont, thereby solves the crude oil wax problem.The coating on capacitance tube 8 surfaces can solve the problems such as fouling, oil or water difficult drop-off on probe electrode surface preferably with the high-performance special material of stable performance, high-k.After sensor probe adopts integrated encapsulating structure, eliminated invalid heating on the one hand, can reduce stray capacitance greatly on the other hand, made heating not have influence substantially measuring electric capacity.
Oil-water two-phase flow contacts the capacitance signal that forms in the direct contact measurement wet oil of employing capacitance probe with probe, and capacitance signal is sent into metering circuit, converts capacitance signal to current signal through change-over circuit, calculates crude oil water content by software for calculation.
The beneficial effects of the utility model: the capacitive transducer of the utility model on-line measurement device of crude oil water content of wellhead, realized crude oil water content being carried out online accurate measurement, can satisfy the demand of oil well production performance analysis and satisfy the data remote requirement at well mouth of oil well.Accuracy of measuring height, maximum relative deviation is in ± 5% scope; Meet the oil field requirement of explosion proof.And, defectives such as error is big, reliability is relatively poor, measurement range is little, cost height have then been solved with respect to microwave, shortwave method and the traditional capacitance method of present On-line Measuring Method.Solved the problem that present oil field individual well well head can't the real time on-line monitoring water percentage.
Description of drawings
Fig. 1 a is the capacitor sensor structure diagrammatic cross-section of the utility model on-line measurement device of crude oil water content of wellhead;
Fig. 1 b is the left pseudosection of Fig. 1 a.
Fig. 2 is the capacitive transducer scheme of installation of the utility model on-line measurement device of crude oil water content of wellhead.
Among the figure, 1. cover tube, 2. transition block, 3. pipe thread nut, 4. joint pin, 5. matrix, 6. electrode tip holder, 7. conduit, 8. capacitance tube, 9. pressing plate, 10. tight lock screw, 11. nuts, 12. coupling bolts, 16. production wellheads, 17. flow lines, 18. capacitive transducers.
Embodiment
Embodiment 1: the capacitive transducer with an on-line measurement device of crude oil water content of wellhead is an example, and the utility model is described in further detail.
Consult Fig. 1 a, the capacitive transducer of crude oil water content of wellhead measurement mechanism of the present utility model comprises cover tube 1, transition block 2, pipe thread nut 3, joint pin 4, matrix 5, electrode tip holder 6, conduit 7, capacitance tube 8, pressing plate 9, lock-screw 10 and nut 11.
Conduit 7 and capacitance tube 8 all adopt the stainless steel capillary of external diameter 0.6mm, internal diameter 0.3mm.Conduit 7 is surperficial naked coatings, and it is the capacitor dielectric of the insulating coating of 30 μ m as formation that capacitance tube 8 surfaces scribble thickness, and the distance between conduit 7 and the capacitance tube 8 is 5mm, and conduit 7 is on capacitance tube 8.The effect of conduit 7 is that capacitance tube 8 is generation utmost points of electric capacity in the capacitive transducer with an electrode that is coated on the electric capacity that its lip-deep water forms; It is the electrical heating wire of 0.15mm that diameter is all arranged in conduit 7 and capacitance tube 8 center pits, and the temperature that guarantees the surface is higher than wax precipitation piont and can be in its surperficial wax deposition.The two ends of conduit 7 and capacitance tube 8 are separately fixed on the cuboid electrode tip holder 6 made of insulating material, and be fixed on the electrode tip holder 6 by the two ends of lock-screw 10 with conduit 7 and capacitance tube 8, make impact lower wire pipe 7 and the capacitance tube 8 of measuring fluid be not easy to come off.Two electrode tip holders 6 are embedded in respectively in matrix 5 inboard wall grooves and with fluid sealant and carry out embedding, conduit 7, capacitance tube 8, lock-screw 10 and heater strip are become one and can not produce loosening.Matrix 5 outer walls are the cylinder bodily form, are slot in the matrix 5; Matrix 5 lower end inwalls are symmetrically distributed with the groove of two mosaic electrode seats 6.Matrix 5 has four axial holes, and joint pin 4 passes the axial hole on matrix 5 walls, consults Fig. 2 b.Be fixed with annular pressing plate 9 in joint pin 4 bottoms by nut 11.Consult Fig. 2 a.The two ends of heater strip are connected with heating wires respectively in conduit 7 and the capacitance tube 8; Conduit 7 and capacitance tube 8 are connected with respectively measures electric capacity output electrode lead (material is a fine copper), and heating wires and measurement electric capacity output electrode lead are drawn by joint pin 4 center pits (internal diameter is 3mm).Heating wires and measure electric capacity output electrode lead and be connected on the connection terminal on the circuit board.The upper end of joint pin 4 is passed pipe thread nut 3 and circular transition block 2 and is fixed by nut.Pipe thread nut 3 welds together with circular transition block 2, and pipe thread nut 3 is the cylinder bodily form, in the lower end of pipe thread nut 3 external thread is arranged, and the upper end is positive hexahedron.The edge of circular transition block 2 is distributed with screw.Cover tube 1 is arranged on the top of circular transition block 2, fixing between cover tube 1 and the transition block 2 by coupling bolt 12.On the cover tube 1 two explosion stack interfaces are arranged, interface is of a size of M25 * 2.0mm.Heating wires and measurement electric capacity output electrode lead pass from the explosion stack interface.Finished the capacitive transducer encapsulation.
Conduit 7 and capacitance tube 8 total length 35mm, effective length 25mm, promptly the distance between two electrode tip holders 6 is 25mm.The rectangularl runner xsect at conduit 7 and capacitance tube 8 places is 20 * 25mm, runner total length 60mm.
Adopt 4-20mA current output signal circuitry needed.The supply voltage of circuit devcie is the 24V DC voltage.
Consult Fig. 2.Capacitive transducer 18 is installed on the flow line 17 of production wellhead 16, and particular location is: flow line 17 is connected on the Centronics port and straight port of threeway.On another straight port of threeway, be fixed with a capacitive transducer 18.
Claims (3)
1. the capacitive transducer of an on-line measurement device of crude oil water content of wellhead mainly is made up of cover tube (1), transition block (2), pipe thread nut (3), joint pin (4), matrix (5), electrode tip holder (6), conduit (7), capacitance tube (8), pressing plate (9), lock-screw (10) and nut (11); It is characterized in that: conduit (7) and capacitance tube (8) all adopt stainless steel capillary, capacitance tube (8) surface scribbles insulating coating, distance between conduit (7) and the capacitance tube (8) is at 3～6mm, in conduit (7) and capacitance tube (8) center pit electrical heating wire is arranged all, the two ends of conduit (7) and capacitance tube (8) are separately fixed on the cuboid electrode tip holder made of insulating material (6), and two electrode tip holders (6) are embedded in matrix (5) inboard wall groove respectively and use the fluid sealant embedding; Matrix (5) outer wall is the cylinder bodily form, is slot in the matrix (5); Matrix (5) lower end inwall is symmetrically distributed with the groove of two mosaic electrode seats (6), matrix (5) has four axial holes, joint pin (4) passes the axial hole on matrix (5) wall, be fixed with annular pressing plate (9) in joint pin (4) bottom by nut (11), the two ends of conduit (7) and the interior heater strip of capacitance tube (8) are connected with heating wires respectively; Conduit (7) and capacitance tube (8) are connected with respectively measures electric capacity output electrode lead, heating wires and measurement electric capacity output electrode lead are drawn by joint pin (4) center pit, heating wires and measure electric capacity output electrode lead and be connected on the connection terminal on the circuit board, the upper end of joint pin (4) is passed pipe thread nut (3) and circular transition block (2) and is fixed by nut, pipe thread nut (3) welds together with circular transition block (2), pipe thread nut (3) is the cylinder bodily form, there is external thread lower end at pipe thread nut (3), the upper end is positive hexahedron, the edge of circular transition block (2) is distributed with screw, cover tube (1) is arranged on the top of circular transition block (2), fixing between cover tube (1) and the transition block (2) by coupling bolt (12).
2. the capacitive transducer of on-line measurement device of crude oil water content of wellhead as claimed in claim 1 is characterized in that: the technology of conduit (7) and capacitance tube (8) and electrical heating wire employing embedding is packaged in the matrix (5) becoming one encapsulating structure.
3. the capacitive transducer of on-line measurement device of crude oil water content of wellhead as claimed in claim 1 or 2, it is characterized in that: described capacitive transducer (18) is installed on the flow line (17) of production wellhead (16), particular location is: flow line (17) is connected on the Centronics port and straight port of threeway, is fixed with capacitive transducer (18) on another straight port of threeway.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202310090U CN201740755U (en) | 2010-06-11 | 2010-06-11 | Capacitance sensor of well mouth crude oil moisture content online measuring device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202310090U CN201740755U (en) | 2010-06-11 | 2010-06-11 | Capacitance sensor of well mouth crude oil moisture content online measuring device |
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| CN201740755U true CN201740755U (en) | 2011-02-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010202310090U Expired - Lifetime CN201740755U (en) | 2010-06-11 | 2010-06-11 | Capacitance sensor of well mouth crude oil moisture content online measuring device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105486701A (en) * | 2015-12-22 | 2016-04-13 | 中国石油天然气股份有限公司 | Online direct measurement device of wellhead crude oil water content on basis of radio frequency method |
| CN109869136A (en) * | 2019-04-11 | 2019-06-11 | 燕山大学 | A kind of land face single pithead oil-water two-phase flow impedance capacitance moisture percentage measuring apparatus |
-
2010
- 2010-06-11 CN CN2010202310090U patent/CN201740755U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105486701A (en) * | 2015-12-22 | 2016-04-13 | 中国石油天然气股份有限公司 | Online direct measurement device of wellhead crude oil water content on basis of radio frequency method |
| CN109869136A (en) * | 2019-04-11 | 2019-06-11 | 燕山大学 | A kind of land face single pithead oil-water two-phase flow impedance capacitance moisture percentage measuring apparatus |
| CN109869136B (en) * | 2019-04-11 | 2020-07-24 | 燕山大学 | Land single-wellhead oil-water two-phase flow resistance capacitance water content measuring device |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110209 |
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| CX01 | Expiry of patent term |