CN208476721U - Fluid density monitoring device - Google Patents
Fluid density monitoring device Download PDFInfo
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- CN208476721U CN208476721U CN201820870600.7U CN201820870600U CN208476721U CN 208476721 U CN208476721 U CN 208476721U CN 201820870600 U CN201820870600 U CN 201820870600U CN 208476721 U CN208476721 U CN 208476721U
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Abstract
The utility model provides a kind of fluid density monitoring device.The device includes: that float part is immersed in liquid, and float can float up and down with the variation of fluid density, and liquid containing has preset height in gutter；Connection component is located above float and connect with float, and connection component can be with float synchronizing moving；Potentiometer includes fixing end on gutter and the electric contact piece that is connected with fixed end in contact, electric contact piece is fixedly connected with connection component, and electric contact piece can be slided relative to fixing end along the vertical direction, the size of current flowed through in potentiometer changes with the variation of relative position between electric contact piece and fixing end；Computation module is connect with fixing end and electric contact piece respectively, and to collectively form circuit loop with potentiometer, computation module converts density value for current value for the current value in measuring circuit circuit.The utility model is capable of the density of real-time monitoring liquid, and can be improved the efficiency of fluid density monitoring.
Description
Technical field
The utility model relates to oil-drilling fields more particularly to a kind of fluid density to monitor.
Background technique
Oil gas occurs in drilling process and invades for drilling fluid, and drilling fluid density can change, if bored without real-time monitoring
The variation of well liquid density may then cause the accidents such as well kick, hide some dangers for the well control safety in drilling safety production process,
Cause unnecessary manpower and economic loss.
Currently, be monitored to fluid density, such as when being monitored to drilling fluid density, usually rely on and be accomplished manually.
Specifically, needing manually to take drilling fluid, and by drilling fluid density detection device, as mud weight indicator (bydrostatic balance) is surveyed
Amount, to obtain drilling fluid density.
However, in the prior art, in measurement drilling fluid density every time, being required to manually drilling fluid be taken to be surveyed again
Amount, to cause the monitoring efficiency of drilling fluid density lower.
Utility model content
For the lower problem of the monitoring efficiency of current fluid density, the utility model provides a kind of fluid density monitoring dress
It sets, not only realizes the real-time monitoring of fluid density, but also improve the efficiency of the monitoring of fluid density.
The utility model provides a kind of fluid density monitoring device, comprising:
Float, the float part are immersed in liquid, and the float can float up and down with the variation of fluid density, institute
Liquid containing is stated in gutter, and there is preset height；
Connection component, the connection component are located above the float and connect with the float, and the connection component can
With the float synchronizing moving；
Potentiometer, the potentiometer include the fixing end on the gutter and are connected with the fixed end in contact
Electric contact piece, the electric contact piece are fixedly connected with the connection component, and the electric contact piece can along the vertical direction relative to
The fixing end is slided, and the size of current flowed through in the potentiometer is with position opposite between the electric contact piece and the fixing end
The variation set and change；
Computation module is connect with the fixing end and the electric contact piece respectively, to collectively form with the potentiometer
Circuit loop, the computation module is used to measure the current value in the circuit loop, and converts density for the current value
Value.
Fluid density monitoring device provided by the utility model, by the way that gutter is fixed in the diversion trench of slurry tank,
And liquid levels height is certain in gutter, and the float floats up and down according to the density size of liquid, drives the connection
Component moves up and down, and then drives moving up and down for electric contact piece in the potentiometer, makes electric contact piece and the fixing end
Contact position changes, and then the resistance value being connected into closed circuit is made to change, finally, being computed component, calculates electricity
Current value in road, and according to the corresponding relationship between preset electric current and density, the current value is converted into density value,
In this way, the efficiency and accuracy of fluid density monitoring not only can be improved, but also the monitoring mode of fluid density is more pacified
Entirely.
Optionally, the connection component includes the specific gravity bar being vertically arranged, and the bottom of the specific gravity bar and the float connect
It connects.
Optionally, at least one first slip ring is provided on the specific gravity bar, first slip ring and the fixing end are solid
Fixed connection.
Optionally, when the quantity of first slip ring is two, two the first slip rings are separately positioned on the electrical contact
The two sides of part.
Optionally, the fixing end includes the resistor rod being vertically arranged, and the electric contact piece includes the second slip ring, and described the
Two slip rings are set on the resistor rod, and second slip ring is fixedly connected with the specific gravity bar.
Optionally, the inlet of the gutter is additionally provided with filter screen.
Optionally, the electric contact piece includes carbon brush.
Optionally, at the preset height of the gutter, it is additionally provided with reserved opening.
Optionally, the shape of the float is spherical shape.
Optionally, the material of the float is plastics.
Fluid density monitoring device provided by the utility model, including float, connection component, potentiometer and computation module,
Wherein, float part is immersed in liquid, and float can float up and down with the variation of fluid density, and the liquid containing is in gutter
In, and there is preset height, above-mentioned connection component is located above float and connect with float, and connection component synchronous with float can move
Dynamic, above-mentioned potentiometer includes the fixing end on gutter and the electric contact piece that is connected with fixed end in contact, the electric contact piece
It is fixedly connected with connection component, and electric contact piece can be slided relative to fixing end along the vertical direction, the electric current flowed through in potentiometer
Size changes with the variation of relative position between electric contact piece and fixing end；Computation module respectively with fixing end and electrical contact
Part connection, to collectively form circuit loop with potentiometer, computation module is for the current value in measuring circuit circuit, and by electric current
Value is converted into density value.Since float can float up and down with the difference of fluid density, and then it will drive the same of connection component
Electric contact piece and the contact position of fixing end occurs in this way, electric contact piece can also move up and down in potentiometer in moved further
Change, and then the size for the resistance value being connected into closed circuit circuit is made to change, computation module passes through counting circuit circuit
In current value, and convert density value for current value, to realize the monitoring of fluid density, avoid and need in the prior art
It the phenomenon that by manually taking liquid and passing through the measuring tools such as bydrostatic balance, carry out liquid density measurement, thus can not only mention
The accuracy and efficiency of high fluid density monitoring, and during being taken to avoid liquid, the peace that staff may be subject to
It is complete to threaten.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is
Some embodiments of the utility model, for those of ordinary skill in the art, without creative efforts,
It is also possible to obtain other drawings based on these drawings.
Fig. 1 is drilling fluid density on-line real time monitoring schematic device；
Fig. 2 is Calibrated current-variable density curve；
Fig. 3 is the flow diagram of fluid density monitoring method embodiment one provided by the embodiment of the utility model.
Description of symbols:
1: gutter
2: float
3: drilling fluid
4: filter screen
5: fixing end
6: connection component
7: the first slip rings
8: electric contact piece
9: flexible circuit conductor
10: computation module
11: the standard value 1 of calibration
12: the standard value 2 of calibration
Specific embodiment
It is practical new below in conjunction with this to keep the objectives, technical solutions, and advantages of the embodiments of the present invention clearer
Attached drawing in type embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that is retouched
The embodiment stated is the utility model a part of the embodiment, instead of all the embodiments.Based on the implementation in the utility model
Example, every other embodiment obtained by those of ordinary skill in the art without making creative efforts belong to
The range of the utility model protection.
Fluid density monitoring device provided by the utility model can be adapted for supervising the density of any liquid medium
In the scene of survey.It is illustrated by taking the density for monitoring drilling fluid as an example in the utility model.
Drilling fluid (original claims mud) refers to working fluid used in drilling well.It can be drilling fluid or gas.Therefore, it bores
Well liquid should definitely be known as drilling fluid.In drilling process, the circulation flushing medium that is used in hole.Also known as drilling fluid.It bores
Well liquid can be divided into clear water, mud, free clay phase flushing liquor, emulsion, foam and compressed air etc. by constituent.Clear water is to make
It is easy to use without processing with earliest drilling fluid, suitable for complete rock stratum and the area having abundant water resources.Mud is to make extensively
Drilling fluid is primarily adapted for use in the hole walls unstable formations such as loose, cranny development, easy collapsing and breaking, water-swellable peeling.
The density of drilling fluid refers to the quality of drilling fluid in per unit volume, commonly uses g/cm3 (or kg/m3) indicate.
On drilling engineering, drilling fluid density and mud balance are two equivalent terms.Its English unit be usually bl/gal (i.e.
Lb/gal, or writing ppg), conversion relation 1g/cm3=8.331bl/gal.
Drilling fluid density is to ensure that safety, rapid drilling and a highly important parameter for protecting oil-gas Layer.Pass through brill
The variation of well liquid density, liquid column hydrostatic pressure of the adjusting drilling well liquid in pit shaft, is also used to put down when balancing formation pore pressure
Weigh stratigraphic structure stress, to avoid the generation of well slough.
In drilling process, the borehole wall (stratum) collapsing stress PIt collapsesOnce generating, rock of borehole is necessarily gradually fallen into well, is formed
It collapses；This situation is encountered, we can effectively be balanced with mud fluid column pressure in well, as mud pressure PMudIt is more than or equal to
PIt collapsesWhen, then the borehole wall keeps stablizing；Work as PMudLess than PIt collapsesWhen, then well slough occurs.
In addition to PIt collapsesExcept, there are also formation fluid pressure P for barefoot intervalGroundAnd stratum cleavage fracture stress PIt is brokenDeng two ground laminations
Power.In drilling process, that we artificially apply is mud pressure PMud.If mud pressure PMudGreater than formation fracture pressure PIt is broken, then send out
Raw leakage；If mud pressure PMudLess than formation fluid pressure, then well kick or blowout occurs.
By the real-time monitoring to drilling fluid density, with regulating density of drilling liquid, to preventing well slough, leakage and well slough etc. from asking
It inscribes most important.
Currently, usually relying on and being accomplished manually when being monitored to drilling fluid density.Specifically, needing manually to take drilling well
Liquid, and by drilling fluid density detection device, if mud weight indicator (bydrostatic balance) measures, to obtain drilling fluid density.But
Be, in aforesaid way, due to need manually drilling fluid is taken to measure again, not only make the monitoring efficiency of drilling fluid density compared with
It is low, and can also have an impact to the safety of staff.
The utility model considers the above problem, proposes a kind of drilling fluid density monitoring device, can utilize and enter drilling well
The density of mechanical structure detection drilling fluid in liquid is described the embodiments of the present invention below in conjunction with attached drawing.
Fig. 1 is a kind of structural schematic diagram for drilling fluid density monitoring device that the example of the utility model provides, such as Fig. 1 institute
It states, the drilling fluid density detection device in the present embodiment, comprising: float 2, connection component 6, potentiometer and computation module 10.Its
In, which is immersed in drilling fluid 3, and float 2 can float up and down with the variation of 3 density of drilling fluid, and drilling fluid 3 is contained
It is placed in gutter 1, and there is preset height；Connection component 6, connection component 6 are located at 2 top of float and connect with float 2, should
Connection component 6 can be with 2 synchronizing moving of float；Potentiometer, the potentiometer include fixing end 5 on gutter 1 and with fixation
The electric contact pieces 8 of 5 contact conducting of end, electric contact piece 8 is fixedly connected with connection component 6, and electric contact piece 8 can phase along the vertical direction
Fixing end 5 is slided, the size of current flowed through in potentiometer with relative position between electric contact piece 8 and fixing end 5 variation
And change；Computation module 10 is connect with fixing end 5 and electric contact piece 8 respectively, to collectively form circuit loop with potentiometer,
The computation module 10 converts density value for current value for the current value in measuring circuit circuit.
Specifically, float 2 can float highly according to the variation of drilling fluid density according to law of buoyancy measurement.
Force analysis is carried out to float 2, when being floated or be suspended in drilling fluid 3 due to float 2, float 2 is altogether by three
The effect of a power is the pressure straight down that connection component 6 is bestowed, the gravity of float 2 itself straight down, and brill respectively
Well liquid 3 is to the buoyancy straight up of float 2, and under the interaction of these three power, float 2 is remain stationary or uniform rectilinear's fortune
Dynamic state, therefore float 2 is in equilibrium state.Under the conditions of stress balance, the buoyancy size of drilling fluid 3 suffered by float 2 is equal to
The sum of the pressure size straight down of connection component 6 suffered by float gravity and float 2.Since float gravity remains constant, protect
The size for demonstrate,proving the pressure straight down of connection component 6 suffered by float 2 is constant, then the buoyancy size suffered by float 2 straight up is protected
It holds constant.
According to buoyancy theorem (Archimedes principle), size and the object of buoyancy suffered by object arrange the gravity phase of liquid
Deng under conditions of the buoyancy size suffered by object is constant, the gravity that object arranges liquid is equal.In drilling fluid density monitoring device
In, liquid is drilling fluid.The gravity that the float 2 arranges drilling fluid 3 remains unchanged, when the density of drilling fluid 3 changes
When, the volume that the float 2 arranges drilling fluid 3 changes, and the float 2 moves up and down therewith, and drives connection component 6 same
Moved further.
Since liquid level (preset height) of the drilling fluid 3 in gutter is constant, 3 density size of drilling fluid
Variation, can be showed by displacement that float 2 moves up and down and direction.
In addition, gutter 1 is placed in the diversion trench of slurry tank, the flowing velocity of mud (drilling fluid) is solid in diversion trench
Definite value, and the velocity magnitude flowed does not change, mud (drilling fluid) flows to gutter, and drilling fluid is in drilling fluid gutter
Liquid level remain unchanged.When the power of slush pump in slurry tank changes, so that mud (bores in the diversion trench of slurry tank
Well liquid) flowing velocity change, but at this point, when the flowing velocity of the drilling fluid after changing still is a fixed value,
Liquid level of the drilling fluid 3 in gutter 1 still remains unchanged although from different before.Briefly, gutter 1 is put
It sets in the diversion trench of slurry tank for being equipped with different model slush pump, liquid level preset height can not be identical, but if gutter
It is placed in the diversion trench of the slurry tank of same model slush pump, the preset height of liquid level is certain.
Slush pump refers in drilling process to the machinery of the conveying flushing liquors such as mud or water in drilling.
Slurry tank mainly includes FG and ZG type oil drilling slurry tank, and the slurry tank circulatory system is according to pot bottom shape point
For rectangular tank and tapered shaped can, tank body uses plate pyramidal structure or corrugated structure, and steel plate and fashioned iron group are welded.
In addition, in one possible implementation, in order to guarantee that it is default that the drilling fluid 3 being contained in gutter 1 has
Highly, reserved opening can also be set at the preset height of gutter 1, in this way, when the liquid level of drilling fluid reaches default height
When spending, drilling fluid can be flowed out from reserved opening.
Optionally, the shape of float 2 can be spherical shape, in addition, float 2 is also possible to other shapes, for example, square,
Cuboid, spheroid etc. show the condition that rule moves up and down as long as can satisfy the change with fluid density, right
In the concrete shape of float 2, the utility model is not particularly limited.It should be noted that in order to enable float can satisfy with
The change of fluid density and show regularity move up and down, in practical applications, the shape of float 2 is usually arranged as rule
Shape.
Further, the material of float 2 can be plastics, it is of course also possible to be other materials, as long as can satisfy with liquid
The change of volume density and show the condition that moves up and down of rule, and float keeps floating or is suspended in drilling fluid, but
The averag density of float 2 must be smaller than the minimum density equal to drilling well 3.
Connection component 6 is connect with float 2, and due to the change with 3 density size of drilling fluid, float 2 can be according to A Ji meter
The generation of moral principle moves up and down accordingly, and when float 2 moves up and down, connection component 6 also can be with synchronizing moving.
Wherein, connection component 6 may include the specific gravity bar being vertically arranged, and the bottom of the specific gravity bar is connect with float.In addition,
Specific gravity bar run-off the straight in order to prevent guarantees that specific gravity bar keeps vertical state, can also be arranged on specific gravity bar at least one the
One slip ring 7, wherein first slip ring is fixedly connected with fixing end 5.
Optionally, the quantity of first slip ring is at least one, i.e. the quantity of the first slip ring is also possible to one, can also
To be multiple, as long as can guarantee that specific gravity bar 6 keeps vertical.For the particular number of the first slip ring, the utility model
It is not particularly limited.
Particularly, when the quantity of the first slip ring is two, two the first slip rings are separately positioned on the two sides of electric contact piece,
It thereby may be ensured that specific gravity bar keeps vertical state, to improve the accuracy of drilling fluid density monitoring.In a kind of possible realization
In mode, the first slip ring can be centering ring.
In addition, potentiometric 5 one end of fixing end is fixed on gutter 1, the other end is fixedly connected with connection component 6, electricity
Contact 8 is fixedly connected with connection component 6, and when connection component 6 moves up and down, electric contact piece 8 can also be with connection component 6
It is slided along the vertical direction relative to fixing end 5, therefore, the density of drilling fluid 3 once changes, and just will drive potentiometric electricity
Contact 8 moves up and down, to make the size of current flowed through in potentiometer with position opposite between electric contact piece 8 and fixing end 5
The variation set and change, achieve the purpose that the signal for changing drilling fluid density is converted into current signal with this.
In one possible implementation, fixing end 5 includes the resistor rod being vertically arranged, and electric contact piece 8 includes second
Slip ring, second slip ring are set on resistor rod, and the second slip ring is fixedly connected with specific gravity bar.Specifically, the second slip ring is set in
It on resistor rod, and is fixedly connected with specific gravity bar, when specific gravity bar is moved up and down with float, the second slip ring can also be in resistor rod
Upper movement, so that the size for the electric current for flowing through resistor rod be made to change.
In addition, electric contact piece 8 also may include carbon brush.
Computation module 10 is connect with fixing end 5 and electric contact piece 8 respectively by flexible circuit conductor 9, is returned so as to constitute circuit
Road, and there is electric current to flow through in the circuit loop, computation module 10 can be with the current value in measuring circuit circuit, and current value is turned
Turn to density value.In float 2 as the difference of drilling fluid density floats up and down, lead to the size hair for flowing through the electric current of fixing end 5
When changing, computation module 10 can will calculate in real time the density value of the drilling fluid after changing.
Optionally, computation module 10 can be density conversion instrument, and density conversion instrument can be according to preset electric current and density
Between corresponding relationship, the obtained current value of measurement is converted into density value.
Fig. 2 is electric current-variable density curve synoptic diagram, as shown in Figure 2, wherein 11 be calibration standard value 1,12 for mark
Fixed standard value 2.Before the density of monitoring drilling fluid, surveyed first by the liquid at least two known density sizes
Amount verifies current reference value to two o'clock standard density, is brought into electric current-density function, and then obtain between electric current and density
Relationship.
By correction, the relationship between electric current and density is obtained, and the relationship between electric current and density is depicted as electric current-
Variable density relation curve y=ax+b, wherein y indicates density, and x indicates electric current, and the value of proportionality coefficient a and constant b is by bringing into
The coordinate of two points of standard density calibration is calculated.After obtaining electric current and the relation function of density, by relation curve letter
Number equation is loaded into the kernel program of density conversion instrument.
The density conversion instrument obtains the big of electric current in closed circuit first by the measurement to electric current in closed circuit
It is small, then current value is brought into electric current-variable density relation curve y=ax+b, wherein proportionality coefficient a and constant b is known
Therefore value is the value that can determine that density y by above-mentioned electric current-variable density relation curve.
Further, density conversion instrument can according to need the output gap of density value, set output gap as 1s,
5s or 1 hour etc., the variable density in drilling fluid is monitored with this.It is of course also possible to the variable density of real-time display drilling fluid.
Optionally, on the basis of the various embodiments described above, filter screen 4 is additionally provided in the inlet of gutter 1.
Specifically, due to there are bubble and impurity, will affect the upper of float in drilling fluid density monitoring device in drilling fluid
Lower movement, makes measurement result compared with actual result, and there are unnecessary errors, influences the accuracy of measurement result.
In order to solve this problem, gutter 1 is fixed in the diversion trench of slurry tank, and in the inlet of gutter 1
It is provided with filter screen 4, filter screen 4 filters out mud diversion trench by filter screen 4 towards drilling fluid flow direction, by drilling fluid 3
In bubble and impurity etc., flow to drilling fluid diversion trench 1, and drilling fluid is contained in gutter 1.Since filtering can be passed through
Net 4 filters out bubble and impurity in drilling fluid, so as to improve the accuracy of drilling fluid density monitoring.
In addition, the filter screen is designed as detachable apparatus, after a period of use, may there is one above filter screen
A little bubble impurity etc., influence using effect, can choose and filter screen is dismantled, is cleaned, then reinstall to use.
Below with reference to Fig. 1, with connection component 6 be specific gravity bar, fixing end 5 is resistor rod, electric contact piece 8 is carbon brush, is calculated
Component 10 be density conversion instrument for, illustrate the course of work of fluid density monitoring device:
Float 2 floats up and down according to the variable density of drilling fluid 3, and will drive specific gravity bar moves up and down, to drive carbon
Brush moves up and down, and carbon brush is connect with resistor rod, and forms closed circuit circuit by flexible circuit conductor and density conversion instrument, carbon brush it is upper
Lower movement causes the resistance sizes being connected in circuit loop to change, so that the size of current in circuit loop is influenced, it is close
Degree conversion instrument measures the size of current in circuit loop first, then in the electric current-density relationship curve demarcated in advance
Function interpolation is carried out, and then is converted into the measurement to drilling fluid density, between the data output time of appropriate adjustment density conversion instrument
Every available real-time drilling fluid density variation.
Fluid density monitoring device provided by the utility model, including float, connection component, potentiometer and computation module,
Wherein, float part is immersed in liquid, and float can float up and down with the variation of fluid density, and the liquid containing is in gutter
In, and there is preset height, above-mentioned connection component is located above float and connect with float, and connection component synchronous with float can move
Dynamic, above-mentioned potentiometer includes the fixing end on gutter and the electric contact piece that is connected with fixed end in contact, the electric contact piece
It is fixedly connected with connection component, and electric contact piece can be slided relative to fixing end along the vertical direction, the electric current flowed through in potentiometer
Size changes with the variation of relative position between electric contact piece and fixing end；Computation module respectively with fixing end and electrical contact
Part connection, to collectively form circuit loop with potentiometer, computation module is for the current value in measuring circuit circuit, and by electric current
Value is converted into density value.Since float can float up and down with the difference of fluid density, and then it will drive the same of connection component
Electric contact piece and the contact position of fixing end occurs in this way, electric contact piece can also move up and down in potentiometer in moved further
Change, and then the size for the resistance value being connected into closed circuit circuit is made to change, computation module passes through counting circuit circuit
In current value, and convert density value for current value, to realize the monitoring of fluid density, avoid and need in the prior art
It the phenomenon that by manually taking liquid and passing through the measuring tools such as bydrostatic balance, carry out liquid density measurement, thus can not only mention
The accuracy and efficiency of high fluid density monitoring, and during being taken to avoid liquid, the peace that staff may be subject to
It is complete to threaten.
Fig. 3 is the flow diagram of fluid density monitoring method embodiment one provided by the embodiment of the utility model, such as Fig. 3
It is shown, on the basis of fluid density monitoring device shown in Fig. 1, fluid density monitoring side provided by the embodiment of the utility model
Method includes the following steps:
Step 301 is immersed in the height in drilling fluid according to float, determines connecing for electric contact piece and fixing end in potentiometer
Touch position.
In the present embodiment, float part is immersed in drilling fluid, according to Archimedes principle, as drilling fluid density is big
Small change, float are immersed in the height in drilling fluid and change, so drive connection component move up and down, thus drive with
The electric contact piece that connection component is fixedly connected moves up and down, therefore electric contact piece and the contact position of fixing end can change.
To reach the height being immersed in drilling fluid according to float, electric contact piece and fixing end contact position in potentiometer are determined
Purpose.
Step 302, according to contact position, potentiometric current value is flowed through in determination.
In the present embodiment, electric contact piece is different from the contact position of fixing end, can make to be connected into closed circuit circuit
Resistance sizes change, to influence the size of current in closed circuit circuit.Current value in the closed circuit circuit,
It can be obtained by density conversion instrument measurement.
Step 303, according to current value, determine the density value of drilling fluid.
In the present embodiment, the current value measured according to density conversion instrument, then in the electric current-density demarcated in advance
The enterprising line function interpolation of relation curve, and then density value is converted by current value.In addition, by adjusting the data of density conversion instrument
Output gap, available real-time drilling fluid density variation.
Fluid density monitoring method provided by the utility model, by being immersed in drilling fluid according to float according to A Ji meter
Moral principle, with the change of drilling fluid density size, float is immersed in the height in drilling fluid and changes, and then drives connection
Component moves up and down, to drive the electric contact piece being fixedly connected with connection component to move up and down, therefore electric contact piece and fixation
The contact position at end can change, and determine the contact position of electric contact piece and fixing end in potentiometer；Then according to contact position
It sets, can make to be connected into the closed circuit circuit that computation module is connected and composed respectively with fixing end and electric contact piece by flexible circuit conductor
Resistance sizes change, to influence the size of current in closed circuit circuit, potentiometric current value is flowed through with determination,
Further according to the current value, in the enterprising line function interpolation of electric current-density relationship curve demarcated in advance, and then current value is converted
For density value.In addition, by adjusting the data output gap of density conversion instrument, available real-time drilling fluid density variation.
Due to fluid density monitoring device provided by the utility model, by mutually converting for electric current and density, liquid is measured
The density of body not only can more efficiently monitor the variable density of liquid, also may be implemented to be real-time to liquid density variation
During monitoring, and avoid the progress liquid density measurement in certain fields there are security risk, staff is in people
Work takes the security threat that may be subject to when liquid.
In the above description, reference term " one embodiment ", " some embodiments ", " example ", " specific example " or
The description of " some examples " etc. means that particular features, structures, materials, or characteristics described in conjunction with this embodiment or example include
In at least one embodiment or example of the utility model.In the present specification, schematic expression of the above terms need not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be any
It can be combined in any suitable manner in a or multiple embodiment or examples.In addition, without conflicting with each other, the technology of this field
The feature of different embodiments or examples described in this specification and different embodiments or examples can be combined by personnel
And combination.
Finally, it should be noted that the above various embodiments is only to illustrate the technical solution of the utility model, rather than it is limited
System；Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should
Understand: it is still possible to modify the technical solutions described in the foregoing embodiments, or to some or all of
Technical characteristic is equivalently replaced；And these are modified or replaceed, it does not separate the essence of the corresponding technical solution, and this is practical new
The range of each embodiment technical solution of type.
Claims (10)
1. a kind of fluid density monitoring device characterized by comprising
Float, the float part are immersed in liquid, and the float can float up and down with the variation of fluid density, the liquid
Body is contained in gutter, and the gutter is placed in diversion trench, and the flowing velocity of liquid described in the diversion trench is solid
Definite value, so that the liquid level of the liquid has preset height in the gutter；
Connection component, the connection component are located above the float and connect with the float, and the connection component can be with institute
State float synchronizing moving；
Potentiometer, the potentiometer include that the fixing end on the gutter and the electricity be connected with the fixed end in contact connect
Contact element, the electric contact piece are fixedly connected with the connection component, and the electric contact piece can be along the vertical direction relative to described
Fixing end is slided, and the size of current flowed through in the potentiometer is with relative position between the electric contact piece and the fixing end
Change and changes；
Computation module is connect with the fixing end and the electric contact piece respectively, to collectively form circuit with the potentiometer
Circuit, the computation module is used to measure the current value in the circuit loop, and converts density value for the current value.
2. fluid density monitoring device according to claim 1, which is characterized in that the connection component includes being vertically arranged
Specific gravity bar, the bottom of the specific gravity bar is connect with the float.
3. fluid density monitoring device according to claim 2, which is characterized in that be provided at least one on the specific gravity bar
A first slip ring, first slip ring are fixedly connected with the fixing end.
4. fluid density monitoring device according to claim 3, which is characterized in that first slip ring quantity be two
When a, two the first slip rings are separately positioned on the two sides of the electric contact piece.
5. according to the described in any item fluid density monitoring devices of claim 2-4, which is characterized in that the fixing end includes perpendicular
The resistor rod being directly arranged, the electric contact piece include the second slip ring, and second slip ring is set on the resistor rod, and described the
Two slip rings are fixedly connected with the specific gravity bar.
6. fluid density monitoring device according to claim 1-4, which is characterized in that the entrance of the gutter
Place is additionally provided with filter screen.
7. fluid density monitoring device according to claim 1-4, which is characterized in that the electric contact piece includes
Carbon brush.
8. fluid density monitoring device according to claim 1-4, which is characterized in that in the institute of the gutter
It states at preset height, is additionally provided with reserved opening.
9. fluid density monitoring device according to claim 1-4, which is characterized in that the shape of the float is
It is spherical.
10. fluid density monitoring device according to claim 1-4, which is characterized in that the material of the float
For plastics.
Priority Applications (1)
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