CN104975844B - A kind of stress levels computational methods and device - Google Patents
A kind of stress levels computational methods and device Download PDFInfo
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- CN104975844B CN104975844B CN201510288400.1A CN201510288400A CN104975844B CN 104975844 B CN104975844 B CN 104975844B CN 201510288400 A CN201510288400 A CN 201510288400A CN 104975844 B CN104975844 B CN 104975844B
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Abstract
The invention provides a kind of stress levels computational methods and device, and applied to the ground corollary apparatus suppressed by capillary to downhole imaging instrument progress clear water, this method includes：Obtain the stress levels of downhole imaging instrument, the length of capillary, internal diameter, the volume flow of injected clear water, the density of clear water and viscosity in capillary, and actual measurement well depth and safety coefficient；The loss of flood peak of the capillary is determined according to the volume flow of injected clear water in the length of capillary, internal diameter, capillary and the density of clear water；The pressure loss of the capillary is determined according to the loss of flood peak and clear water density；The liquid column hydrostatic pressure of the capillary is determined according to actual measurement well depth；According to the stress levels, the pressure loss and liquid column hydrostatic pressure of downhole imaging instrument, the minimum operating pressures that of calculating ground corollary apparatus；The stress levels of ground corollary apparatus are determined according to the minimum operating pressures that and safety coefficient.Reliably reference frame can be provided using the present invention for the structure design and Intensity Design of ground corollary apparatus.
Description
Technical field
The present invention relates to petroleum well logging technology field, more particularly to a kind of clear water to suppress anti-soil type downhole imaging instrument ground and match somebody with somebody
The computational methods and device of covering device stress levels.
Background technology
Downhole imaging instrument is a kind of tester that oil, gas and water well are checked using visible light camera, can by the instrument
Situations such as directly to observe the casing damage logged well, casing-broken, trouble of lost tool in hole, perforating quality, effective response for water flood direction.In order to
Oil, gas and water well underground greasy dirt, contamination of the impurity to downhole imaging instrument camera lens are prevented, by using clear water booster pump from including hair
To downhole imaging instrument injected clear water in capillary in the photoelectric compound cable of tubule, so as to anterior in downhole imaging instrument camera lens
Clear water liquid film is formed, to reach the purpose of soil resistant.The video camera needs hair of the ground corollary apparatus by photoelectric compound cable
Tubule injected clear water could realize soil resistant function, and during injected clear water, bottom pressure can be delivered to ground by capillary
Face corollary apparatus, ground corollary apparatus will have enough stress levels, to realize that clear water suppresses anti-pollution function, prevent simultaneously
Gas blowout accident.
The content of the invention
In view of suppressing the requirement of downhole imaging instrument ground corollary apparatus stress levels to clear water above, the invention provides one
Kind stress levels computational methods and device.
One aspect of the present invention provides a kind of stress levels computational methods, and downhole imaging instrument is carried out applied to by capillary
The ground corollary apparatus that clear water is suppressed, described stress levels computational methods include：
Obtain the stress levels of downhole imaging instrument, the length of capillary, internal diameter, in capillary injected clear water volume flow
The viscosity of amount, the density of clear water and clear water, and actual measurement well depth and safety coefficient；
According to determining the volume flow of injected clear water in the length of capillary, internal diameter, capillary and the density of clear water
The loss of flood peak h of capillaryf；
According to the loss of flood peak hfAnd the density determines the pressure loss P of the capillaryf：
Pf=ρ ghf；
The liquid column hydrostatic pressure P of the capillary is determined according to actual measurement well depthh：
Ph=ρ gh；
According to the stress levels P of downhole imaging instrumentw, the pressure loss PfAnd the liquid column hydrostatic pressure Ph, described in calculating
The minimum operating pressures that P of downhole imaging instrument ground corollary apparatusg：
Pg=Pw-Ph+Pf；
According to the minimum operating pressures that PgAnd safety coefficient a determines the stress levels of the ground corollary apparatus and defeated
Go out；
Wherein, hfFor the loss of flood peak of the capillary, m；PfFor the pressure loss of the capillary, Pa；ρ is the hair
The density of clear water, kg/m in tubule3；G is acceleration of gravity, 9.8m/s2；PwFor the stress levels of the downhole imaging instrument, Pa；
PhFor the liquid column hydrostatic pressure of the capillary, Pa；H is to survey well depth, m；PgFor the downhole imaging instrument ground corollary apparatus most
Small operating pressure, Pa；A is safety coefficient.
In one embodiment, according to the volume flow of injected clear water in the length of capillary, internal diameter, capillary and clear water
Density determines the loss of flood peak of the capillary, including：
The flow velocity v of clear water in the capillary is calculated according to the internal diameter and volume flow：
According to the viscosity of the density and clear water of the flow velocity and the clear water, the Reynolds of clear water in the capillary is calculated
Number Re：
Re=ρ vd/ μ；
The resistance coefficient λ of clear water in the capillary is calculated according to the Reynolds number：
During Re ＜ 4000,
During 4000 ＜ Re ＜ 100000,
During 100000 ＜ Re ＜ 1000000,
According to the length of the flow velocity, internal diameter, resistance coefficient and the capillary, the head for calculating the capillary damages
Lose hf：
Wherein, v be the capillary in clear water flow velocity, m/s；V is the volume flow of injected clear water in the capillary,
m3/s；D be the capillary internal diameter, m；Re is the Reynolds number of clear water in the capillary；μ is clear water in the capillary
Viscosity, mPa.s；λ is the resistance coefficient of clear water in the capillary；L be the capillary length, m.
In one embodiment, the volume flow of injected clear water is not less than 3 × 10 in the capillary-5m3/s。
In one embodiment, according to the minimum operating pressures that PgAnd safety coefficient a determines the ground corollary apparatus
Stress levels, including：
According to the minimum operating pressures that PgAnd the safety coefficient a, calculate the stress levels of the ground corollary apparatus
P：
P=Pg×(1+a)；
Wherein, P is the stress levels of the ground corollary apparatus.
In one embodiment, it is characterised in that the safety coefficient a is 0.3.
Another aspect of the present invention also provides a kind of stress levels computing device, applied to by capillary to downhole imaging instrument
The ground corollary apparatus that clear water is suppressed is carried out, described stress levels computing device includes：
Data capture unit, for obtaining the stress levels of downhole imaging instrument, the length of capillary, internal diameter, in capillary
The viscosity of the volume flow of injected clear water, the density of clear water and clear water, and actual measurement well depth and safety coefficient；
Calculation of head losses unit, the volume flow for injected clear water in the length according to capillary, internal diameter, capillary
And the density of clear water determines the loss of flood peak h of the capillaryf；
Calculation of pressure loss unit, for according to the loss of flood peak hfAnd the density determines the pressure of the capillary
Lose Pf：
Pf=ρ ghf；
Liquid column hydrostatic pressure computing unit, for determining the liquid column hydrostatic pressure P of the capillary according to actual measurement well depthh：
Ph=ρ gh；
Minimum operating pressures that computing unit, for the stress levels P according to downhole imaging instrumentw, the pressure loss PfAnd
The liquid column hydrostatic pressure Ph, calculate the minimum operating pressures that P of the downhole imaging instrument ground corollary apparatusg：
Pg=Pw-Ph+Pf；
Stress levels computing unit, for according to the minimum operating pressures that PgAnd safety coefficient a determines that the ground is matched somebody with somebody
The stress levels of covering device and output；
Wherein, hfFor the loss of flood peak of the capillary, m；PfFor the pressure loss of the capillary, Pa；ρ is the hair
The density of clear water, kg/m in tubule3；G is acceleration of gravity, 9.8m/s2；PwFor the stress levels of the downhole imaging instrument, Pa；
PhFor the liquid column hydrostatic pressure of the capillary, Pa；H is to survey well depth, m；PgFor the downhole imaging instrument ground corollary apparatus most
Small operating pressure, Pa；A is safety coefficient.
In one embodiment, the calculation of head losses unit includes：
Flow relocity calculation module, for calculating the flow velocity v of clear water in the capillary according to the internal diameter and volume flow：
Reynolds number computing module, for the viscosity of density and clear water according to the flow velocity and the clear water, calculate institute
State the reynolds number Re of clear water in capillary：
Re=ρ vd/ μ；
Resistance coefficient computing module, for calculating the resistance coefficient λ of clear water in the capillary according to the Reynolds number：
During Re ＜ 4000,
During 4000 ＜ Re ＜ 100000,
During 100000 ＜ Re ＜ 1000000,
Calculation of head losses module, for the length according to the flow velocity, internal diameter, resistance coefficient and the capillary,
Calculate the loss of flood peak h of the capillaryf：
Wherein, v be the capillary in clear water flow velocity, m/s；V is the volume flow of injected clear water in the capillary,
m3/s；D be the capillary internal diameter, m；Re is the Reynolds number of clear water in the capillary；μ is clear water in the capillary
Viscosity, mPa.s；λ is the resistance coefficient of clear water in the capillary；L be the capillary length, m.
In one embodiment, the volume flow of injected clear water is not less than 3 × 10- in the capillary5m3/s。
In one embodiment, the stress levels computing unit is specifically used for according to the minimum operating pressures that PgIt is and described
Safety coefficient a, calculate the stress levels P of the ground corollary apparatus：
P=Pg×(1+a)；
Wherein, P is the stress levels of the ground corollary apparatus.
In one embodiment, the safety coefficient a is 0.3.
Clear water, which can be calculated, using the present invention suppresses minimum operating pressures that needed for the corollary apparatus of downhole imaging instrument ground,
So that it is determined that the stress levels of ground corollary apparatus, enable to realize that clear water suppresses soil resistant when designing ground corollary apparatus
Function, while prevent the generation of gas blowout accident.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 show the schematic flow sheet of stress levels computational methods of the embodiment of the present invention；
Fig. 2 show the schematic flow sheet that the embodiment of the present invention calculates capillary head loss；
Fig. 3 show the structural representation of stress levels computing device of the embodiment of the present invention；
Fig. 4 show the structural representation of calculation of head losses unit of the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made
Embodiment, belong to the scope of protection of the invention.
The invention provides a kind of stress levels computational methods, and downhole imaging instrument is carried out clearly by capillary for calculating
The stress levels for the ground corollary apparatus that water is suppressed, the flow of this method are as shown in Figure 1.
First, the stress levels of downhole imaging instrument are obtained, the length of used capillary, internal diameter, capillary are interior to be injected
The viscosity of the volume flow of clear water, the density of clear water and clear water, and the safety coefficient of actual measurement well depth and ground corollary apparatus (see
Step 1).
Usually, can be according to the model and wall thickness of capillary in the photoelectric compound cable being connected with downhole imaging instrument, really
Determine the internal diameter of capillary；Can according to downhole imaging instrument test well depth determine used in capillary length, can also be according to upper
The length for stating photoelectric compound cable determines the length of capillary；Realize the injected clear water needed for downhole imaging instrument soil resistant function
Volume flow is usually not less than a limit value；When downhole imaging instrument works, the density of clear water and viscosity are known substance in capillary
Reason amount.
Secondly, according to the volume flow of injected clear water in the length of capillary, internal diameter, capillary and the density of clear water, really
The loss of flood peak h of the fixed capillaryf(see step 2).
Obtaining the loss of flood peak h of above-mentioned capillaryfAfterwards, by loss of flood peak hfAnd the density of clear water is brought into capillary
Formula (1), to determine the pressure loss P of the capillaryf(see step 3).
Pf=ρ ghf (1)
According to the density of clear water in actual measurement well depth (i.e. the vertical depth of well) and capillary, the quiet of above-mentioned capillary is determined
Head of liquid Ph(see step 4)：
Ph=ρ gh (2)
Again, according to the stress levels P of downhole imaging instrumentw, above-mentioned pressure loss PfAnd liquid column hydrostatic pressure Ph, calculate institute
State the minimum operating pressures that P that downhole imaging instrument ground corollary apparatus is borng(see step 5)；
Pg=Pw-Ph+Pf (3)
Finally, according to above-mentioned minimum operating pressures that PgAnd above-mentioned safety coefficient a determines the pressure-resistant etc. of ground corollary apparatus
Level is simultaneously exported (see step 6).
Wherein, hfFor the loss of flood peak of above-mentioned capillary, m；PfFor the pressure loss of above-mentioned capillary, Pa；ρ is above-mentioned hair
The density of clear water, kg/m in tubule3；G is acceleration of gravity, 9.8m/s2；PwFor the stress levels of above-mentioned downhole imaging instrument, Pa；
PhFor the liquid column hydrostatic pressure of above-mentioned capillary, Pa；H is to survey well depth, m；PgFor above-mentioned downhole imaging instrument ground corollary apparatus most
Small operating pressure, Pa；A is safety coefficient.
Pass through the above method, it may be determined that clear water suppresses the stress levels of antifouling downhole imaging instrument ground corollary apparatus.It is logical
Cross the minimum operating pressures that the ground corollary apparatus that this method is calculated is born, be ground corollary apparatus structure design and
Intensity Design provides reference frame, ensures that clear water suppresses the realization of anti-pollution function, while prevent the generation of gas blowout accident.
Ask for the loss of flood peak h of capillaryfWhen, its calculation procedure is referred to the progress of flow shown in Fig. 2, but the present invention is simultaneously
It is not limited.
As shown in Fig. 2 calculate the loss of flood peak h of capillaryfMainly include the following steps that：
Step 21 into, the volume flow of clear water in the internal diameter and capillary of above-mentioned capillary is brought to formula (4), calculate capillary
The flow velocity v of interior clear water：
Step 22, bring the density of clear water in above-mentioned flow velocity and above-mentioned capillary and viscosity into formula (5), calculate above-mentioned hair
The reynolds number Re of clear water in tubule：
Re=ρ vd/ μ (5)
Step 23, the size according to above-mentioned Reynolds number, select in different formula (formula (6), formula (7) or formula (8)) calculating
State the resistance coefficient λ of clear water in capillary：
As Re ＜ 4000,
As 4000 ＜ Re ＜ 100000,
As 100000 ＜ Re ＜ 1000000,
Step 24, by the resistance coefficient of clear water in the flow velocity of clear water in above-mentioned capillary, capillary inner diameter, capillary and
The length of capillary brings formula (9) into, calculates the loss of flood peak h of above-mentioned capillaryf：
Wherein, v be capillary in clear water flow velocity, m/s；V be capillary in injected clear water volume flow, m3/s；D is
The internal diameter of capillary, m；Re is the Reynolds number of clear water in capillary；μ be capillary in clear water viscosity, mPa.s；λ is capillary
The resistance coefficient of interior clear water；L be capillary length, m.
In one embodiment, to reach soil resistant effect, into above-mentioned capillary, the volume flow of injected clear water is general not
Less than 3 × 10-5m3/s。
In step 6, according to above-mentioned minimum operating pressures that PgAnd safety coefficient a, determine the resistance to of the ground corollary apparatus
Press grade：
P=Pg×(1+a) (10)
Wherein, P is the stress levels of above-mentioned ground corollary apparatus.
Usually, the safety coefficient a of above-mentioned ground corollary apparatus is usually 0.3.
Pass through the above method, it may be determined that clear water suppresses the stress levels of antifouling downhole imaging instrument ground corollary apparatus.It is logical
Cross the minimum operating pressures that the ground corollary apparatus that this method is calculated is born, be ground corollary apparatus structure design and
Intensity Design provides reference frame, ensures that clear water suppresses the realization of anti-pollution function, while prevent the generation of gas blowout accident.
In a specific embodiment, for example, as it is known that the design stress levels of downhole imaging instrument are 30MPa, capillary A's
External diameter Φ 6.35mm, wall thickness 1.6mm, capillary pipe length 3000m, take injection capillary A clear water volume flow for 3 ×
10-5m3/ s can reach soil resistant effect, and the density of clear water is 1000kg/m in capillary A3, viscosity 0.981 × 10-3mPa.s。
First, understand that the internal diameter of the capillary is 4.75mm by capillary A external diameter and wall thickness, by capillary A
The volume flow of injected clear water brings formula (4) into footpath, capillary A, and the flow velocity v for obtaining clear water in capillary A is 1.694m/s.
Secondly, by the density of clear water in known capillary A and viscosity, above-mentioned capillary A internal diameter, and above-mentioned capillary
Clear water flow velocity v brings formula (5) into pipe A, and the reynolds number Re for trying to achieve clear water in capillary A is 8201.42.
According to the occurrence of above-mentioned reynolds number Re, the resistance coefficient λ of clear water in capillary A can be asked for formula (7), is computed
Understand, the resistance coefficient λ of clear water is 0.033 in capillary A.
Bring the flow velocity of clear water in above-mentioned capillary A length, internal diameter, capillary A and resistance coefficient into formula (9), can obtain
Capillary A loss h at handfFor 3073.73m.
Try to achieve capillary A loss of flood peak hfAfterwards, the density of clear water in the loss of flood peak and capillary A is brought into formula
(1) pressure loss P of the capillary, is determinedfFor 30.12MPa.
When oil well is a Vertical Well, equal length of the actual measurement well depth generally with capillary, but if oil well and level side
To an inclination angle be present, then the liquid column hydrostatic pressure of capillary need to be asked for according to actual measurement well depth.In the present embodiment, oil well is set as one
Vertical Well, therefore the equal length of well depth and capillary A is surveyed, actual measurement well depth can be replaced to bring formula (2) into capillary A length
Ask for capillary A liquid column hydrostatic pressure Ph, the liquid column hydrostatic pressure for trying to achieve capillary A is 29.4MPa.
Again, according to the design stress levels 30MPa of downhole imaging instrument, by the capillary A tried to achieve pressure loss PfAnd
Its liquid column hydrostatic pressure PhFormula (3) is brought into, to ask for the minimum operating pressures that P that above-mentioned downhole imaging instrument ground corollary apparatus is borng
For 30.72MPa.
Finally, according to above-mentioned minimum operating pressures that Pg, it is contemplated that safety coefficient is usually 0.3, is tried to achieve according to formula (10)
The stress levels for stating ground corollary apparatus are 39.936MPa, are approximately 40MPa.
Based on also being provided with the stress levels computational methods identical inventive concept shown in Fig. 1 and Fig. 2, the embodiment of the present application
A kind of stress levels computing device, as described in example below.Because the stress levels computing device solves the principle of problem
It is similar to stress levels computational methods, therefore the implementation of the stress levels computing device may refer to stress levels computational methods
Implement, repeat part and repeat no more.
Another aspect of the present invention also provides a kind of stress levels computing device, for calculating by capillary to downhole imaging
Instrument carries out the stress levels for the ground corollary apparatus that clear water is suppressed, and the structure of the device is as shown in Figure 3.
In the structure chart shown in Fig. 3, above-mentioned stress levels computing device includes：Data capture unit 101, the loss of flood peak
Computing unit 102, Calculation of pressure loss unit 103, liquid column hydrostatic pressure computing unit 104, minimum operating pressures that computing unit 105
And stress levels computing unit 106.
Data capture unit 101, for obtaining the stress levels of downhole imaging instrument, the length of capillary, internal diameter, capillary
The volume flow of interior injected clear water, the density of clear water and viscosity, and actual measurement well depth and safety coefficient.
Calculation of head losses unit 102, it is connected with data capture unit 101, for the length according to above-mentioned capillary, interior
The volume flow of injected clear water and the density of clear water in footpath, capillary, determine the loss of flood peak h of above-mentioned capillaryf。
Calculation of pressure loss unit 103, it is connected, uses with calculation of head losses unit 102 and data capture unit 101 respectively
According to above-mentioned loss of flood peak hfAnd the density of clear water determines the pressure loss P of the capillary in capillaryf。
Liquid column hydrostatic pressure computing unit 104, it is connected with data capture unit 101, it is above-mentioned for being determined according to actual measurement well depth
The liquid column hydrostatic pressure P of capillaryh。
Minimum operating pressures that computing unit 105, respectively with data capture unit 101, Calculation of pressure loss unit 103 and quiet
Head of liquid calculates unit 104 and connected, for the stress levels P according to downhole imaging instrumentw, above-mentioned pressure loss PfAnd hydrostatic
Column pressure Ph, calculate the minimum operating pressures that P of above-mentioned downhole imaging instrument ground corollary apparatusg。
Stress levels computing unit 106, connect respectively with minimum operating pressures that computing unit 105 and data capture unit 101
Connect, for according to above-mentioned minimum operating pressures that PgAnd safety coefficient a determines stress levels and the output of above-mentioned ground corollary apparatus.
Fig. 4 is the structural representation of the loss of flood peak of embodiment of the present invention unit 102.In the present embodiment, loss of flood peak meter
Calculating unit 102 includes：Flow relocity calculation module 1020, Reynolds number computing module 1022, resistance coefficient computing module 1024, head
Costing bio disturbance module 1026.
Flow relocity calculation module 1020, for the internal diameter and hair of the above-mentioned capillary sent according to data capture unit 101
The volume flow of injected clear water calculates the flow velocity v of clear water in the capillary in tubule.
Reynolds number computing module 1022, it is connected with above-mentioned flow relocity calculation module 1020, for according to above-mentioned flow velocity v, capillary
The density of clear water and viscosity calculate the reynolds number Re of clear water in capillary in pipe.
Resistance coefficient computing module 1024, it is connected with above-mentioned Reynolds number computing module 1022, for according to the reynolds number Re
Ask for the resistance coefficient λ of clear water in above-mentioned capillary.
Calculation of head losses module 1026, it is connected respectively with resistance coefficient computing module 1024, flow relocity calculation module 1020,
For asking for above-mentioned hair according to the flow velocity v of clear water in above-mentioned resistance coefficient λ, capillary and the length and internal diameter of above-mentioned capillary
The loss of flood peak h of tubulef。
In one embodiment, stress levels computing unit 106 can be according to above-mentioned minimum operating pressures that PgAnd safety coefficient a,
Ask for the stress levels P of above-mentioned ground corollary apparatus.
Using the computing device of stress levels provided by the invention, clear water can be obtained and suppress antifouling downhole imaging instrument ground
The minimum operating pressures that corollary apparatus is born, reference frame is provided for the structure design and Intensity Design of ground corollary apparatus,
Result of calculation is reliable, ensure that clear water suppresses the realization of anti-pollution function, while can prevent the generation of gas blowout accident.
Stress levels computational methods are not described in detail for stress levels computing device provided by the invention, specifically retouch
Address citing and refer to stress levels computational methods, will not be repeated here.
Apply specific embodiment in the present invention to be set forth the principle and embodiment of the present invention, above example
Explanation be only intended to help understand the present invention method and its core concept；Meanwhile for those of ordinary skill in the art,
According to the thought of the present invention, there will be changes in specific embodiments and applications, in summary, in this specification
Appearance should not be construed as limiting the invention.
Claims (10)
1. a kind of stress levels computational methods, supporting applied to the ground suppressed by capillary to downhole imaging instrument progress clear water
Device, it is characterised in that described stress levels computational methods include：
Obtain the stress levels of downhole imaging instrument, it is the length of capillary, internal diameter, the volume flow of injected clear water in capillary, clear
The density of water and the viscosity of clear water, and actual measurement well depth and safety coefficient；
The capillary is determined according to the volume flow of injected clear water in the length of capillary, internal diameter, capillary and the density of clear water
The loss of flood peak h of pipef；
According to the loss of flood peak hfAnd the density determines the pressure loss P of the capillaryf：
Pf=ρ ghf；
The liquid column hydrostatic pressure P of the capillary is determined according to actual measurement well depthh：
Ph=ρ gh；
According to the stress levels P of downhole imaging instrumentw, the pressure loss PfAnd the liquid column hydrostatic pressure Ph, calculate the underground
The minimum operating pressures that P of video camera ground corollary apparatusg：
Pg=Pw-Ph+Pf；
According to the minimum operating pressures that PgAnd safety coefficient a determines stress levels and the output of the ground corollary apparatus；
Wherein, hfFor the loss of flood peak of the capillary, m；PfFor the pressure loss of the capillary, Pa；ρ is the capillary
The density of interior clear water, kg/m3；G is acceleration of gravity, 9.8m/s2；PwFor the stress levels of the downhole imaging instrument, Pa；PhFor
The liquid column hydrostatic pressure of the capillary, Pa；H is to survey well depth, m；PgFor the minimum of the downhole imaging instrument ground corollary apparatus
Operating pressure, Pa；A is safety coefficient.
2. stress levels computational methods according to claim 1, it is characterised in that according to the length of capillary, internal diameter, hair
The volume flow of injected clear water and the density of clear water determine the loss of flood peak of the capillary in tubule, including：
The flow velocity v of clear water in the capillary is calculated according to the internal diameter and volume flow：
<mrow>
<mi>v</mi>
<mo>=</mo>
<mfrac>
<mrow>
<mn>4</mn>
<mi>V</mi>
</mrow>
<mrow>
<mi>&pi;</mi>
<msup>
<mi>d</mi>
<mn>2</mn>
</msup>
</mrow>
</mfrac>
<mo>;</mo>
</mrow>
According to the viscosity of the density and clear water of the flow velocity and the clear water, the Reynolds number of clear water in the capillary is calculated
Re：
Re=ρ vd/ μ；
The resistance coefficient λ of clear water in the capillary is calculated according to the Reynolds number：
During Re ＜ 4000,
<mrow>
<mi>&lambda;</mi>
<mo>=</mo>
<mfrac>
<mn>64</mn>
<mi>Re</mi>
</mfrac>
<mo>,</mo>
</mrow>
During 4000 ＜ Re ＜ 100000,
<mrow>
<mi>&lambda;</mi>
<mo>=</mo>
<mfrac>
<mn>0.3164</mn>
<msup>
<mi>Re</mi>
<mn>0.25</mn>
</msup>
</mfrac>
<mo>,</mo>
</mrow>
During 100000 ＜ Re ＜ 1000000,
<mrow>
<mfrac>
<mn>1</mn>
<msqrt>
<mi>&lambda;</mi>
</msqrt>
</mfrac>
<mo>=</mo>
<mn>21</mn>
<mi>g</mi>
<mrow>
<mo>(</mo>
<mi>Re</mi>
<msqrt>
<mi>&lambda;</mi>
</msqrt>
<mo>)</mo>
</mrow>
<mo>-</mo>
<mn>0.8</mn>
<mo>;</mo>
</mrow>
According to the length of the flow velocity, internal diameter, resistance coefficient and the capillary, the loss of flood peak h of the capillary is calculatedf：
<mrow>
<msub>
<mi>h</mi>
<mi>f</mi>
</msub>
<mo>=</mo>
<mi>&lambda;</mi>
<mfrac>
<mi>l</mi>
<mi>d</mi>
</mfrac>
<mfrac>
<msup>
<mi>v</mi>
<mn>2</mn>
</msup>
<mrow>
<mn>2</mn>
<mi>g</mi>
</mrow>
</mfrac>
<mo>;</mo>
</mrow>
Wherein, v be the capillary in clear water flow velocity, m/s；V be the capillary in injected clear water volume flow, m3/s；
D be the capillary internal diameter, m；Re is the Reynolds number of clear water in the capillary；μ is the viscosity of clear water in the capillary,
mPa.s；λ is the resistance coefficient of clear water in the capillary；L be the capillary length, m.
3. stress levels computational methods according to claim 1, it is characterised in that the body of injected clear water in the capillary
Product flow is not less than 3 × 10-5m3/s。
4. stress levels computational methods according to claim 1, it is characterised in that according to the minimum operating pressures that PgAnd
Safety coefficient a determines the stress levels of the ground corollary apparatus, including：
According to the minimum operating pressures that PgAnd the safety coefficient a, calculate the stress levels P of the ground corollary apparatus：
P=Pg×(1+a)；
Wherein, P is the stress levels of the ground corollary apparatus.
5. according to the stress levels computational methods described in claim any one of 1-4, it is characterised in that the safety coefficient a is
0.3。
6. a kind of stress levels computing device, supporting applied to the ground suppressed by capillary to downhole imaging instrument progress clear water
Device, it is characterised in that described stress levels computing device includes：
Data capture unit, for obtaining the stress levels of downhole imaging instrument, the length of capillary, internal diameter, capillary are interior to be injected
The viscosity of the volume flow of clear water, the density of clear water and clear water, and actual measurement well depth and safety coefficient；
Calculation of head losses unit, for the volume flow of injected clear water in the length according to capillary, internal diameter, capillary and clear
The density of water determines the loss of flood peak h of the capillaryf；
Calculation of pressure loss unit, for according to the loss of flood peak hfAnd the density determines the pressure loss of the capillary
Pf：
Pf=ρ ghf；
Liquid column hydrostatic pressure computing unit, for determining the liquid column hydrostatic pressure P of the capillary according to actual measurement well depthh：
Ph=ρ gh；
Minimum operating pressures that computing unit, for the stress levels P according to downhole imaging instrumentw, the pressure loss PfIt is and described
Liquid column hydrostatic pressure Ph, calculate the minimum operating pressures that P of the downhole imaging instrument ground corollary apparatusg：
Pg=Pw-Ph+Pf；
Stress levels computing unit, for according to the minimum operating pressures that PgAnd safety coefficient a determines the ground corollary apparatus
Stress levels and output；
Wherein, hfFor the loss of flood peak of the capillary, m；PfFor the pressure loss of the capillary, Pa；ρ is the capillary
The density of interior clear water, kg/m3；G is acceleration of gravity, 9.8m/s2；PwFor the stress levels of the downhole imaging instrument, Pa；PhFor
The liquid column hydrostatic pressure of the capillary, Pa；H is to survey well depth, m；PgFor the minimum of the downhole imaging instrument ground corollary apparatus
Operating pressure, Pa；A is safety coefficient.
7. stress levels computing device according to claim 6, it is characterised in that the calculation of head losses unit bag
Include：
Flow relocity calculation module, for calculating the flow velocity v of clear water in the capillary according to the internal diameter and volume flow：
<mrow>
<mi>v</mi>
<mo>=</mo>
<mfrac>
<mrow>
<mn>4</mn>
<mi>V</mi>
</mrow>
<mrow>
<mi>&pi;</mi>
<msup>
<mi>d</mi>
<mn>2</mn>
</msup>
</mrow>
</mfrac>
<mo>;</mo>
</mrow>
Reynolds number computing module, for the viscosity of density and clear water according to the flow velocity and the clear water, calculate the hair
The reynolds number Re of clear water in tubule：
Re=ρ vd/ μ；
Resistance coefficient computing module, for calculating the resistance coefficient λ of clear water in the capillary according to the Reynolds number：
During Re ＜ 4000,
<mrow>
<mi>&lambda;</mi>
<mo>=</mo>
<mfrac>
<mn>64</mn>
<mi>Re</mi>
</mfrac>
<mo>,</mo>
</mrow>
During 4000 ＜ Re ＜ 100000,
<mrow>
<mi>&lambda;</mi>
<mo>=</mo>
<mfrac>
<mn>0.3164</mn>
<msup>
<mi>Re</mi>
<mn>0.25</mn>
</msup>
</mfrac>
<mo>,</mo>
</mrow>
During 100000 ＜ Re ＜ 1000000,
<mrow>
<mfrac>
<mn>1</mn>
<msqrt>
<mi>&lambda;</mi>
</msqrt>
</mfrac>
<mo>=</mo>
<mn>21</mn>
<mi>g</mi>
<mrow>
<mo>(</mo>
<mi>Re</mi>
<msqrt>
<mi>&lambda;</mi>
</msqrt>
<mo>)</mo>
</mrow>
<mo>-</mo>
<mn>0.8</mn>
<mo>;</mo>
</mrow>
Calculation of head losses module, for the length according to the flow velocity, internal diameter, resistance coefficient and the capillary, calculate
The loss of flood peak h of the capillaryf：
<mrow>
<msub>
<mi>h</mi>
<mi>f</mi>
</msub>
<mo>=</mo>
<mi>&lambda;</mi>
<mfrac>
<mi>l</mi>
<mi>d</mi>
</mfrac>
<mfrac>
<msup>
<mi>v</mi>
<mn>2</mn>
</msup>
<mrow>
<mn>2</mn>
<mi>g</mi>
</mrow>
</mfrac>
<mo>;</mo>
</mrow>
Wherein, v be the capillary in clear water flow velocity, m/s；V be the capillary in injected clear water volume flow, m3/s；
D be the capillary internal diameter, m；Re is the Reynolds number of clear water in the capillary；μ is the viscosity of clear water in the capillary,
mPa.s；λ is the resistance coefficient of clear water in the capillary；L be the capillary length, m.
8. stress levels computing device according to claim 6, it is characterised in that the body of injected clear water in the capillary
Product flow is not less than 3 × 10-5m3/s。
9. stress levels computing device according to claim 6, it is characterised in that the stress levels computing unit is specific
For according to the minimum operating pressures that PgAnd the safety coefficient a, calculate the stress levels P of the ground corollary apparatus：
P=Pg×(1+a)；
Wherein, P is the stress levels of the ground corollary apparatus.
10. according to the stress levels computing device described in claim any one of 6-9, it is characterised in that the safety coefficient a is
0.3。
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| HU225403B1 (en) * | 2000-03-13 | 2006-11-28 | Andras Dr Boerzsoenyi | Method and apparatus for calibration of flowmeter of liquid flowing in canal |
| JP5294388B2 (en) * | 2008-03-07 | 2013-09-18 | パナソニック株式会社 | Flow measuring device |
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