CN102435534B - Underground fluid density measuring device - Google Patents
Underground fluid density measuring device Download PDFInfo
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- CN102435534B CN102435534B CN201110434446.1A CN201110434446A CN102435534B CN 102435534 B CN102435534 B CN 102435534B CN 201110434446 A CN201110434446 A CN 201110434446A CN 102435534 B CN102435534 B CN 102435534B
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Abstract
The invention discloses an underground fluid density measuring device. A left mercury column and a right mercury column of a U-shaped mercury tank in the measuring device are respectively connected with an upper pressure sensor and a lower pressure sensor by virtue of an upper pressure sensor pressure transmitting guide pipe and a lower pressure sensor pressure transmitting guide pipe, the pressure sensor pressure transmitting guide pipes are filled with pressure transmitting medium, and the outer walls of the left mercury column and the right mercury column are respectively provided with a capacitor electrode or a resistance electrode. The lower part of the U-shaped mercury tank is provided with an electrode connected with mercury, and the inner bottom of the U-shaped mercury tank is provided with a valve used for controlling the opening and closing of the mercury columns at the two sides. The measuring device disclosed by the invention has high safety and is difficult to damage; and reliability of the measuring device can be improved, and the working life of the measuring device can be prolonged.
Description
Technical field
The invention belongs to well measurement engineering device technique field, and in particular to a kind of underground fluid density measuring device.This
The bright measurement that can be used for fluid density in Oil/gas Well, is mainly adapted to peupendicular hole and inclined shaft.
Background technology
Radioactive density meter is mainly used in the measurement of country's oil gas well density at present.The densimeter is due to will arrange in instrument
One gamma ray projector, brings extra security protection problem.It is close that fluid is realized in the urgent need to using other methods in market
The measurement of degree.
The differential fluid density meter of FDD003 shapes of SONDEX companies of U.S. production, has the characteristics that：Its internal employing
One accurate elastic film differential pressure pick-up.Depending on the deflection of thin film is by the pressure difference of both sides.Thin film both sides are arranged
Two capacitance electrodes, determine the deflection of diaphragm with capacitance method.As the absolute pressure of underground survey point is up to 100MPa,
And the pressure reduction that fluid density is produced is both less than 0.01MPa, absolute pressure exceeds more than 10,000 times of measured value.In order to prevent pressure reduction from surpassing
Go out rated value, the use requirement of whole instrument is very numerous and diverse, and easily damage its accurate differential pressure pickup in use.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of underground fluid density measuring device.The principle of the present invention is profit
The pressure differential and tested pressure difference produced with U-shaped mercury cell both sides mercury pressure difference balances each other, and surveys human body with mercurial sphygmomanometer
The principle of blood pressure is similar.
The underground fluid density measuring device of the present invention, is characterized in, described measurement apparatus include hydrargyrum bowl assembly, pass
Pressure conduit, inductor；Described hydrargyrum bowl assembly contains U-shaped mercury cell I, the electrode I of connection hydrargyrum, notes in U-shaped mercury cell I
There is hydrargyrum；The left side mercury column I of U-shaped mercury cell I is connected with upper inductor by upper inductor pressure transmission conduit I, U-shaped mercury cell I
Right side mercury column I is connected with lower inductor by lower inductor pressure transmission conduit, is situated between filled with pressure transmission in upper inductor pressure transmission conduit
Matter I, filled with transmission medium II in lower inductor pressure transmission conduit, divides on the outer wall of left side mercury column I and right side mercury column I
Inductor lateral capacitance electrode and lower inductor lateral capacitance electrode are not provided with；The bottom of U-shaped mercury cell I is provided with connection water
The electrode I of silver, the bottom in U-shaped mercury cell I are additionally provided with both sides mercury columns on-off valve I；Upper inductor lateral capacitance electrode, lower sense
Depressor lateral capacitance electrode, the electrode I of connection hydrargyrum are connected with capacitive differential change-over circuit respectively；Capacitive differential change-over circuit and number
Word process and transmission circuit, downhole transmitted cable, surface recording device are sequentially connected.
Described upper inductor lateral capacitance electrode is identical with the length of lower inductor lateral capacitance electrode.
Described transmission medium I and transmission medium II adopt insulating oil.
I tube wall of left side mercury column and right side hydrargyrum vial wall of described U-shaped mercury cell I is made using insulant, water
The internal diameter of silver-colored column jecket is 3mm～6mm, and the wall thickness of hydrargyrum column jecket is 1mm～3mm.
The length of described upper inductor lateral capacitance electrode and lower inductor lateral capacitance electrode is 5cm～10cm.
A kind of second structure of underground fluid density measuring device of the present invention is essentially identical with above-mentioned measurement apparatus, no
It is that described upper inductor lateral capacitance electrode and lower inductor lateral capacitance electrode replace with inductor side resistance respectively with part
Electrode and lower inductor side resistance electrode, in the top difference of the left side mercury column II and right side mercury column II of U-shaped mercury cell II
It is provided with inductor side resistance electrode and lower inductor side resistance electrode, upper inductor side resistance electrode and lower inductor side electricity
Resistance electrode is contacted with transmission medium III, transmission medium IV respectively.Described capacitive differential change-over circuit replaces with resistance value survey
Amount circuit.
Described transmission medium III, transmission medium IV are respectively adopted conducting electrolyte solution.Described U-shaped mercury cell II
The tube wall of left side mercury column II and right side mercury column II is adopted and is made from an insulative material, and its internal diameter is 3mm～6mm.The present invention exists
One bath resistance rate measurement column for being used as correction for temperature effect will be set in the second structure again.
Underground fluid density measuring device proposed by the present invention has advantages below：1. compare with radioactive density meter, can
The radioactive source in instrument is saved, the difficulty of equipment placement and transport is reduced, is improve safety.2. it is and external（The U.S.
SONDEX companies FDD003 shapes）Using differential fluid density meter compare and have the characteristics that：1. the biography of deformation of thin membrane principle
Sensor, because the working pressure of down-hole is higher by more than 10,000 times than the maximum differential pressure value of measurement, so the thin film rapid wear of sensor
It is bad.And the deformation element of mercury column pressure force balance type sensor is hydrargyrum.It is hardly damaged, and is conducive to improving its reliability and work
Make the life-span.2. column pressure balanced type sensor is compared with the external accurate elastic film sensor for adopting, manufacturing process requirement compared with
It is low, it is easy to production and popularizing action.
Description of the drawings
Fig. 1 is the schematic diagram of the underground fluid density measuring device of the present invention.
Fig. 2 is the generalized section of the underground fluid density measuring device first embodiment of the present invention.
Fig. 3 is the measuring circuit block diagram of the underground fluid density measuring device first embodiment of the present invention.
Fig. 4 is the generalized section of the second embodiment of the present invention.
Fig. 5 is the section of structure of bath resistance rate measurement column in the second embodiment of the present invention.
In figure, inductor pressure transmission conduit 3. transmission medium I 4. times inductor 5. times sense on inductor 2. is 1. gone up
Inductor lateral capacitance electricity on II 8. left side mercury column of depressor pressure transmission 6. transmission medium of conduit, I 9. right side mercury column I 11.
I 14. both sides mercury columns on-off valve of electrode, the I 15.U shape water of pole 12. times inductor lateral capacitance electrodes 13. connection hydrargyrums
I 16 II 19. right side mercury column of .U shapes II 18. left side mercury column of mercury cell of silver-colored groove, II 21. capacitive differential conversion electricity
Inductor side on 24. surface recording device 31. of 22. digitized processing of road and 23. downhole transmitted cable of transmission circuit
32. times 33. bath resistance rate of inductor side resistance electrode, 34. bath resistance rates of measurement Top electrode of resistance electrode are surveyed
IV 37. transmission medium of amount post 35. bath resistance rate measurement 36. transmission medium of bottom electrode III 43. connects hydrargyrum
II 44 II 15.U shapes mercury cell of both sides mercury column on-off valves of electrode, I 16. U-shaped mercury cell II.
Specific embodiment
Invention is described in further detail below according to accompanying drawing.
Fig. 1 is the schematic diagram of the underground fluid density measuring device of the present invention.In Fig. 1, the downhole fluid density of the present invention
The operation principle of measurement apparatus is that the upper inductor 1 of mercury absolute pressure balance sensor part is by upper inductor pressure transmission conduit 2
With upper inductor transmission medium I 3, I 8 upper table of mercury column on the left of the U-shaped mercury cell that pressure is sent in the hydrargyrum bowl assembly of lower section
Face.Pressure is sent to lower section mercury cell by lower inductor pressure transmission conduit 5 and lower inductor transmission medium II 6 by lower inductor 4
I 9 upper surface of right side mercury column of the U-shaped mercury cell in component.Pressure reduction change between two pressure-sensitive mouths will cause U-shaped mercury cell two
The respective change of side mercury pressure.Measure the difference in height of both sides mercury column, so that it may directly calculate between the pressure tap of both sides
Pressure difference.When instrument is in vertical position, following formula has been seen from U-shaped mercury cell internal pressure balance：
··········①
In formula：P：The pressure differential of upper and lower two pressure-sensitive mouth.
H：The difference in height of upper and lower two pressure-sensitive mouth.
h：The difference on upper inductor side mercury column surface and lower inductor side mercury column surface.
ρ（It is situated between）：The density of both sides transmission medium.
ρ（Hydrargyrum）：The density of hydrargyrum.
g：Acceleration of gravity
As the pressure difference between upper and lower inductor is produced under gravity by borehole fluid density, have following flat
Weighing apparatus formula：
········②
ρ in formula（Fluid）For detected fluid density in well.
By 1., 2. two formulas are solved:
···········③
In a measuring instrument, ρ（It is situated between）、ρ（Hydrargyrum）、H is known, measures the discrepancy in elevation of mercury columnH, just
The density of borehole fluid is obtained.
In Fig. 1, the function of upper and lower two inductors is that the pressure of borehole fluid is directly delivered to the biography inside inductor
On pressure medium, inductor shell is made up of rubber film or plastic sheeting, and film thickness is between 0.05 to 0.2 millimeter.Require
The deflection of inductor volume is big（More than 1 cubic centimetre）, and inside and outside differential pressure is as far as possible little（Less than 0.0001MPa）.Two pressure-sensitive
The borehole fluid directly contact of perforate and outside of the device by tool housing, the mounting distance of upper and lower two inductorH and density
The sensitivity of measurement is relevant, is typically chosen as 0.3 to 1 meter.The selection of pressure transmission tube material is relevant with the setting of measurement apparatus, also may be used
Using metal catheter, resistance measurement should adopt insulated conduit.The selection of transmission medium is also relevant with the setting of measurement apparatus.
Embodiment 1
Fig. 2 is the generalized section of the underground fluid density measuring device first embodiment of the present invention.Fig. 3 is of the invention
The measuring circuit block diagram of underground fluid density measuring device.In Fig. 2, Fig. 3, a kind of downhole fluid density of invention
Measurement apparatus, including hydrargyrum bowl assembly, pressure transmission conduit, inductor；Described hydrargyrum bowl assembly contains U-shaped mercury cell I 15, connection
The electrode I 13 of hydrargyrum, is marked with hydrargyrum in U-shaped mercury cell I 15；The left side mercury column I 8 of U-shaped mercury cell I 15 is by upper inductor
Pressure transmission conduit I 2 is connected with upper inductor 1, and I 15 right side mercury column I 9 of U-shaped mercury cell is by lower inductor pressure transmission conduit 5 and lower sense
Depressor 4 connects, and filled with transmission medium I3 in upper inductor pressure transmission conduit 2, is situated between filled with pressure transmission in lower inductor pressure transmission conduit 5
Matter II6, be respectively arranged with the outer wall of left side mercury column I 8 and right side mercury column I 9 inductor lateral capacitance electrode 11 and under
Inductor lateral capacitance electrode 12；The bottom of U-shaped mercury cell I 15 is provided with the electrode I 13 of connection hydrargyrum, in U-shaped mercury cell I 15
Bottom be additionally provided with both sides mercury columns on-off valve I 14；Upper inductor lateral capacitance electrode 11, lower inductor lateral capacitance electrode 12,
The electrode I 13 of connection hydrargyrum is connected with capacitive differential change-over circuit 21 respectively；Capacitive differential change-over circuit 21 and digitized processing
It is sequentially connected with transmission circuit 22, downhole transmitted cable 23, surface recording device 24.
Described upper inductor lateral capacitance electrode 11 is identical with the length of lower inductor lateral capacitance electrode 12, is 6mm.
Described transmission medium I3 and transmission medium II6 adopt insulating oil.
I 8 tube wall of left side mercury column and I 9 tube wall of right side mercury column of described U-shaped mercury cell I 15 adopts insulant system
Into the internal diameter of hydrargyrum column jecket is 4mm, and the wall thickness of hydrargyrum column jecket is 2mm.
In Fig. 2, I 15 housing of U-shaped mercury cell is made up of resistant to elevated temperatures insulant, and transmission medium adopts insulating oil.Both sides
Hydrargyrum column outer wall is cylindrical insulator, and outside is inserted in pressure-sensitive lateral capacitance cylindrical metal sleeve as external electrode, that is, goes up pressure-sensitive
Device lateral capacitance electrode 11 and lower inductor lateral capacitance electrode 12, mercury column are interior electrode.The height of left side mercury column can pass through upper
Capacitance between the electrode I 13 of inductor lateral capacitance electrode 11 and connection hydrargyrum is measuring.The height of right side mercury column can lead to
The capacitance crossed down between the electrode I 13 of inductor lateral capacitance electrode 12 and connection hydrargyrum is measuring.
Upper inductor lateral capacitance electrode 11 and lower inductor lateral capacitance electrode 12 are isometric, and its length is measured by fluid density
The spacing of scope and upper and lower inductorH determining, typically between 5 to 10 centimetres.Due to measuring model in whole fluid density
In enclosing（Generally 0-1.3 Ke/㎝）The mercury column liquid level of lower sensor side is averagely higher than the mercury column liquid for uploading sensor side
Face, a following inductor lateral capacitance electrode 12 can be installed higher than upper inductor lateral capacitance electrode 11, properly increase 0 to 3 centimetre.
The electrode I 13 of connection hydrargyrum is arranged on side-lower or the bottom of U-shaped mercury cell I.The bottom of U-shaped mercury cell I 15 is also
Equipped with both sides mercury columns on-off valve I 14.During measurement, both sides hydrargyrum is communicated as one.Before instrument horizontal positioned and transportation
In should all close the valve, with the flowing for preventing both sides transmission medium mutual.
Fig. 3 is the measuring circuit block diagram of the underground fluid density measuring device first embodiment of the present invention.As shown in Figure 3.U
The difference of I 15 both sides cylindrical capacitive of shape mercury cell is converted to magnitude of voltage by capacitive differential change-over circuit 21, then be digitized into and
Transmission circuit 22, downhole transmitted cable 23 deliver to surface recording device 24.The partial circuit is also designed to downhole data storage,
Later stage surface readout formula.
Two cylindrical outer electrodes and the upper inductor lateral capacitance electrode 11, lower inductor as coaxial electrode in Fig. 2
12 mercury column of lateral capacitance electrode constitutes two coaxial capacitances, and the effective depth of its capacitance and mercury column in electrode is directly proportional,
Thus the difference of two electric capacity can be linear reflection borehole fluid density change.In order to realize the measurement of capacitance, as same
The electrode 13 of the upper inductor lateral capacitance electrode 11, lower inductor lateral capacitance electrode 12 and connection hydrargyrum of axial electrode all must be outside
Portion wraps insulant, them is isolated with the fluid in well.One preferable solution is by whole U-shaped mercury cell I
In one section of oil-overflow packoff nipple.
Embodiment 2
Fig. 4 is the generalized section of the second embodiment of the present invention.Fig. 5 is electrolyte electricity in the second embodiment of the present invention
The section of structure of resistance rate measurement column.In Fig. 4, Fig. 5, it is second knot of the underground fluid density measuring device of the present invention
Structure, the present embodiment are identical with the basic structure of embodiment 1, are a difference in that, described upper inductor lateral capacitance electrode 11 is with
Inductor lateral capacitance electrode 12 replaces with inductor side resistance electrode 31 and lower inductor side resistance electrode 32 respectively, in U-shaped
The top of the left side mercury column II 18 and right side mercury column II 19 of mercury cell II 16 is respectively arranged with inductor side resistance electrode
31 and lower inductor side resistance electrode 32, upper inductor side resistance electrode 31 and lower inductor side resistance electrode 32 respectively with pressure transmission
Medium III 37, transmission medium IV 36 contact.Capacitive differential change-over circuit replaces with resistance measurement circuit.Resistance difference is changed
Circuit is sequentially connected with digitized processing and transmission circuit, downhole transmitted cable, surface recording device.
Described transmission medium III 37, transmission medium IV 36 are respectively adopted conductive electrolyte solution.Described U-shaped mercury cell II
16 left side mercury column II 18 and the tube wall of right side mercury column II 19 are adopted and are made from an insulative material, and its internal diameter is 3mm.
In Fig. 4, Fig. 5, U-shaped mercury cell II 16 is overall to be still made up of high-temperature insulation material, the transmission medium III 37 of top
Transmission medium IV 36 arranges two annular electrodes on the top of II 16 two-arm of U-shaped mercury cell using conductive electrolyte solution, its
Contact with electrolyte phase on the inside of electrode.
The electrode II 43 and both sides mercury columns on-off valve II 44 of connection hydrargyrum are provided with the lower section of U-shaped mercury cell II 16.Water
The resistivity of the resistivity ratio electrolyte of silver is low by 104More than times, can disregard.In measurement inductor side resistance electrode 31 be connected
Resistance R1 between the electrode II 43 of hydrargyrum, it may be determined that the height in left side hydrargyrum face.The lower inductor side resistance electrode of measurement 32 with
Resistance R2 between the electrode II 43 of connection hydrargyrum, it may be determined that the height of right side hydrargyrum liquid level.As the resistivity of electrolyte becomes
Change be influenced by temperature it is larger, then arrange one be used as correction for temperature effect bath resistance rate measurement column 34, electrolyte electricity
Bath resistance rate measurement Top electrode 33 and bath resistance rate measurement bottom electrode 35 are provided with resistance rate measurement column 34.Measurement electricity
Bath resistance rate measures the resistance R3 between Top electrode 33 and bath resistance rate measurement bottom electrode 35.R1, R2, R3 are measured simultaneously
Just left and right sides hydrargyrum face height is can determine, the difference in height of hydrargyrum cylinder is calculated, so as to draw the density value of liquid in well.
Advantage of this embodiment is that the measuring circuit of resistance value is simpler, it is difficult by external interference, reliable operation.Have the disadvantage electrolyte electricity
Resistance rate temperature influence is larger, and Data processing must be corrected with 34 measurement data of bath resistance rate measurement column.
In the present embodiment, the acquisition process of resistance measurement data and embodiment 1 are similar, simply change capacitance measurement circuit
Resistance measurement circuit is done, while adding measurement and the data correction of bath resistance rate.
Described in Fig. 4, Fig. 5 in resistance measurement inductor side resistance electrode 31 and lower inductor side resistance electrode 32 inner side
Directly contact with electrolyte solution.As the resistivity of electrolyte varies with temperature larger, thus a flag to be set
For the bath resistance rate measurement column 34 of resistivity amendment, while remaking data correction after measurement.Due to the resistivity of electrolyte
Also it is related to the concentration of solute, so the transmission medium IV 36 of upper inductor, the transmission medium III of lower inductor in the present embodiment
37 will ensure consistent with the concentration of the medium in bath resistance rate measurement column 34.
Claims (8)
1. a kind of underground fluid density measuring device, it is characterised in that described measurement apparatus include that hydrargyrum bowl assembly, pressure transmission are led
Pipe, inductor；Described hydrargyrum bowl assembly contains U-shaped mercury cell I（15）, connection hydrargyrum electrode I (13), in U-shaped mercury cell I
（15）In be marked with hydrargyrum；The left side mercury column I of U-shaped mercury cell I (15)（8）By upper inductor pressure transmission conduit（2）With upper pressure-sensitive
Device（1）Connection, the right side mercury column I of U-shaped mercury cell I (15)（9）By lower inductor pressure transmission conduit（5）With lower inductor（4）
Connection, in upper inductor pressure transmission conduit（2）It is interior filled with transmission medium I（3）, in lower inductor pressure transmission conduit（5）It is interior filled with pressure transmission
Medium II（6）, the mercury column I in left side（8）With right side mercury column I（9）Outer wall on be respectively arranged with inductor lateral capacitance electricity
Pole（11）With lower inductor lateral capacitance electrode（12）；The bottom of U-shaped mercury cell I (15) is provided with the electrode I of connection hydrargyrum
（13）, the bottom in U-shaped mercury cell I (15) is additionally provided with both sides mercury columns on-off valve I（14）；Upper inductor lateral capacitance electrode
（11）, lower inductor lateral capacitance electrode（12）, connection hydrargyrum electrode I（13）Respectively with capacitive differential change-over circuit（21）Even
Connect；Capacitive differential change-over circuit（21）With digitized processing and transmission circuit（22）, downhole transmitted cable（23）, surface seismic records
Equipment（24）It is sequentially connected.
2. measurement apparatus according to claim 1, it is characterised in that described upper inductor lateral capacitance electrode（11）With under
Inductor lateral capacitance electrode（12）Length it is identical.
3. measurement apparatus according to claim 1, it is characterised in that described transmission medium I（3）With transmission medium II
（6）Using insulating oil.
4. measurement apparatus according to claim 1, it is characterised in that described U-shaped mercury cell I（15）Left side mercury column
Ⅰ（8）Tube wall and right side mercury column I（9）Tube wall is adopted and is made from an insulative material, and the internal diameter of hydrargyrum column jecket is 3mm～6mm, mercury column
The wall thickness of pipe is 1mm～3mm.
5. measurement apparatus according to claim 1, it is characterised in that described upper inductor lateral capacitance electrode（11）With under
Inductor lateral capacitance electrode（12）Length be 5cm～10cm.
6. measurement apparatus according to claim 1, it is characterised in that described upper inductor lateral capacitance electrode（11）With under
Inductor lateral capacitance electrode（12）Inductor side resistance electrode is replaced with respectively（31）With lower inductor side resistance electrode（32）,
In U-shaped mercury cell II（16）Left side mercury column II（18）With right side mercury column II（19）Top be respectively arranged with inductor
Side resistance electrode（31）With lower inductor side resistance electrode（32）, upper inductor side resistance electrode（31）, lower inductor side resistance
Electrode（32）Respectively with transmission medium III（37）, transmission medium IV（36）Contact；Described capacitive differential change-over circuit（21）
Replace with resistance measurement circuit.
7. measurement apparatus according to claim 6, it is characterised in that described transmission medium III（37）, transmission medium IV
（36）Conducting electrolyte solution is respectively adopted.
8. measurement apparatus according to claim 6, it is characterised in that described U-shaped mercury cell II（16）Left side hydrargyrum
Post II（18）With right side mercury column II（19）Tube wall adopt and be made from an insulative material, its internal diameter is 3mm～6mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110434446.1A CN102435534B (en) | 2011-12-22 | 2011-12-22 | Underground fluid density measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110434446.1A CN102435534B (en) | 2011-12-22 | 2011-12-22 | Underground fluid density measuring device |
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| CN102435534A CN102435534A (en) | 2012-05-02 |
| CN102435534B true CN102435534B (en) | 2017-04-12 |
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| CN201110434446.1A Active CN102435534B (en) | 2011-12-22 | 2011-12-22 | Underground fluid density measuring device |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104596888B (en) * | 2015-02-11 | 2017-01-25 | 中国工程物理研究院总体工程研究所 | Temperature-control liquid density measuring device |
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| CN85201390U (en) * | 1985-04-09 | 1986-02-12 | 胜利油田钻井工艺研究院 | Continuous measurement device for aq. drilling slurry density |
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| CN85201390U (en) * | 1985-04-09 | 1986-02-12 | 胜利油田钻井工艺研究院 | Continuous measurement device for aq. drilling slurry density |
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