CN105954490B - A kind of dynamic wax control result evaluation method of tungsten alloy coating oil pipe - Google Patents
A kind of dynamic wax control result evaluation method of tungsten alloy coating oil pipe Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention discloses a kind of dynamic wax control result evaluation method of tungsten alloy coating oil pipe, comprise the following steps：The density and viscosity of step 1 determination experiment oil sample at different temperatures, oil sample viscosity, density with temperature's variation relation figure are obtained according to the data measured；Graph of a relation and Hydrodynamics Theory that step 2 is obtained according to step 1, determine the fluid flow state in oil pipe；Step 3 calculates the hydraulic simulation experiment of oil pipe according to the fluid flow state obtained in step 2；The parameter that step 4 is obtained according to step 3, step 2, calculates the caliber changing value of different oil pipes；The parameter that step 5 is obtained according to step 4, calculates different tubing wax amounts；The parameter that step 6 is obtained according to step 5, calculates the inhibiting rate for wax precipitation of tungsten alloy coating oil pipe.
Description
Technical field
The present invention relates to high-content wax oil well production and collect it is defeated during the dynamic wax control result evaluation side of tungsten alloy coating oil pipe
Method, can carry out analysis calculating, quantitative assessment tungsten alloy for the experimental result obtained under different simulated experiments or working condition
Dynamic wax control result of the coating oil pipe relative to plain tubing.
Background technology
Crude oil is the mixture of multicomponent hydrocarbon composition.During oil extraction, due to temperature, the drop of pressure
Low, crude oil may be changed into solution-air, liquid-solid two-phase or airwater mist cooling by single liquid phase.The precipitation of wax in crude oil, grow up,
It can adhere to, be deposited on well wellbore inwall, influence crude output, or even cause oil well to stop production.
In order to solve the wax deposition problem of oil well, oil field takes a variety of Paraffin Removal measures, including mechanical Paraffin Removal, heating power are clear
Wax control, surface energy wax control, chemical agent Paraffin Removal, sound wave Paraffin Removal, strong magnetic Paraffin Removal and microbial wax control etc..Wherein, surface
Energy wax control is broadly divided into oil tube inner lining wax control and coating wax control two ways, and its mechanism of action is by improving the smooth of tube wall
Degree, improves surface wettability (reaching hydrophilic and oleophobic), wax is difficult deposition, so as to reach the purpose of wax control.The conventional glass in oil field
There is the problem of easy to wear, the life-span is shorter in glass lining and polyurethanes coating, and tungsten alloy coating there is high temperature resistant, it is resistance to
The features such as mill, anticorrosion, and water-wetted surface can be formed on surface, wax control result can be played and lasted a long time.
For evaluate tungsten alloy coating oil pipe relative to plain tubing dynamic wax control result, applicant applied one on
The patent of " Novel oil well tungsten alloy coating wax control result detection means (Patent No. CN201420853451.5) ", the patent is given
Go out a kind of wax control result detection means, do not introduce specific evaluation method.The present invention proposes a kind of based on patent
The dynamic wax control result evaluation side of Novel oil well tungsten alloy coating wax control result detection means disclosed in CN201420853451.5
Method.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of dynamic wax control result evaluation method of tungsten alloy coating oil pipe.Should
The applicable device of method makes tungsten alloy coating oil pipe be hung down with contrast plain tubing simulation oil well by using " N " type structure design
Straight tube stream.The evaluation method can simulate under scene production conditions the differential pressure at (such as temperature and flow velocity) two kinds of oil pipe two ends, root
According to the Data Management Analysis of sensor collection in device, the dynamic inhibiting rate for wax precipitation of tungsten alloy coating oil pipe is calculated, tungsten alloy is realized
The quantitative evaluation of coating oil pipe wax control result.
To realize the technical purpose, the solution of the present invention is：
A kind of dynamic wax control result evaluation method of tungsten alloy coating oil pipe, comprises the following steps：
The density and viscosity of step 1 determination experiment oil sample at different temperatures, according to the data measured obtain oil sample viscosity,
Density with temperature's variation relation figure；
Graph of a relation and Hydrodynamics Theory that step 2 is obtained according to step 1, determine the fluid flow state in oil pipe；
Step 3 calculates the hydraulic simulation experiment of oil pipe according to the fluid flow state obtained in step 2；
The parameter that step 4 is obtained according to step 3, step 2, calculates the caliber changing value of different oil pipes；
The parameter that step 5 is obtained according to step 4, calculates different tubing wax amounts；
The parameter that step 6 is obtained according to step 5, calculates the inhibiting rate for wax precipitation of tungsten alloy coating oil pipe.
The implementation method of step 2 is：
According to Hydrodynamics Theory, the fluidised form of fluid hose stream can be judged that Reynolds number is defined as with Reynolds number：
Wherein, Re --- Reynolds number；ρ --- fluid density, kg/m3；μ --- fluid kinematic viscosity, mPas；v——
Mean flow rate, m/s；D0--- the internal diameter of initial oil pipe, m；Q --- flow, m3/s。
The Reynolds number of the oil sample flowing under setting experiment condition in device is calculated using formula (1), Re≤2000 are
Laminar flow, Re >=2000 are turbulent flows.
The implementation method of step 3 is：
When fluid flow state is laminar flow, i.e. during Re≤2000, hydraulic simulation experiment calculation formula is：
When fluid hose stream belongs to the hydraulically smooth state in turbulent flow, i.e. the ε of 2000 ＜ Re ＜ 59.7/8/7When, flow resistance
Coefficient formulas is：
When fluid hose stream belongs to the mixed film friction state in turbulent flow, i.e. 59.7/ ε8/7＜ Re ＜ (665-765lg ε)/ε
When, hydraulic simulation experiment calculation formula is：
When fluid hose stream belongs to the hydraulically rough state in turbulent flow, i.e.,When, flow resistance system
Counting calculation formula is：
Wherein, λ --- hydraulic simulation experiment；ε --- relative roughness, ε=2 Δs/d；Δ --- absolute roughness, mm.
The implementation method of step 4 is：According to fluid mechanics principle, pipeline processing head loss formula is：
Pipeline frictional head loss is expressed as again：
It can be obtained according to formula (6) and formula (7)：
It can thus be concluded that：
Using data acquisition processing system, the differential pressure at test section two ends in pipe-line system is obtained, and then calculating obtains wax deposition
The internal diameter of different oil pipes afterwards；
Wherein, after D-- wax deposition oil pipe internal diameter, m；hf--- frictional head loss, m；L --- coiled tubing test section pipeline is long
Degree, m；Δ P --- coiled tubing test pipeline section two ends pressure difference, Pa；ρ --- fluid density, kg/m3, Q --- flow, m3/s；λ --- water
The power coefficient of friction resistance.
The implementation method of step 5 is：The formula for calculating the wax deposition amount of different oil pipes is：
Wherein, D0--- the internal diameter of initial oil pipe, m；D --- the internal diameter of oil pipe, m after wax deposition.
The implementation method of step 6 is：The formula of inhibiting rate for wax precipitation for calculating tungsten alloy coating oil pipe is：
Wherein, E --- inhibiting rate for wax precipitation, %；mr--- plain tubing wax deposition amount, g；mt--- tungsten alloy coating tubing wax amount,
g。
Compared with prior art, the beneficial effects of the present invention are：
The invention provides tungsten alloy coating oil pipe, compared with plain tubing, the wax control result in simulation oil well production process is quantified
Change evaluation method, use this method can be with the inhibiting rate for wax precipitation that calculates of efficiently and accurately, and can accurately obtain the wax deposition of pipeline inner wall
Amount and wax deposition thickness, reference is provided for period of removing the wax arrangement.
By experimental provision horizontal positioned, tungsten is closed this computational methods under the different defeated parameters of collection during can be used for waxy oil collection defeated
The dynamic wax control result evaluation of gold plate pipe.
This method can also be used to evaluate the dynamic wax control result of other paraffin removal and control methods (such as chemical Paraffin Removal).
Can be that oil field determines Paraffin Removal with the wax control result of the different paraffin removal and control methods of visual evaluation by the application of this method
Measure provides reference.
Brief description of the drawings
The invention will be further described below in conjunction with the accompanying drawings：
Fig. 1 is the structural representation of novel coating oil pipe wax control result evaluating apparatus in the present invention
Wherein：In figure：1-tungsten alloy coating oil pipe, 2-insulation water-bath casing layer, 3-Low Constant Temperature Water Baths, 4-it is common
Oil pipe, 5-differential pressure pick-up, 6-tapping valve, 7-agitator, 8-feed flow kettle, 9-screw pump, 10-data acquisition system
System.
Embodiment
For the content of the invention and application flow of the present invention can be further described, following examples are hereby enumerated, and carry out detailed
It is described as follows：
As shown in figure 1, the device of this method foundation, by pipe-line system, thermostatic control system, metering system, power feed flow
System, data acquisition and software systems etc. are constituted.
The device specifically includes tungsten alloy coating oil pipe 1, insulation water-bath casing layer 2, Low Constant Temperature Water Baths 3, plain tubing
4th, differential pressure pick-up 5, tapping valve 6, agitator 7, feed flow kettle 8, screw pump 9 and data acquisition and software systems 10 etc..
Pipe-line system is externally provided with insulation water-bath casing layer 2, and the outside of insulation water-bath casing layer 2 is provided with insulation material 14, protected
The outside of adiabator 14 is provided with tinfoil paper band 15, and pipe-line system is divided into pipeline test section and reference section, when pipe-line system is vertically put
When putting, test section and reference section are parallel to each other, and test section is tungsten alloy coating pipe 1, and reference section is plain tubing 4, during experiment
Waxy crude oil is full of whole pipe-line system；Pipe-line system is in integrally " N " type, to ensure that fluid is in test section 1 when being disposed vertically
It is to flow from bottom to top with reference section 4.Pipeline lower end sets tapping valve 6, experiment to release pipeline fluid after terminating.
Thermostatic control system carries out circulating-heating using single water-bath system；By cryogenic thermostat water bath 3 and insulation water
The grade of casing layer 2 is bathed to constitute.Cryogenic thermostat water bath 3 is connected with insulation water-bath sleeve pipe 2, and insulation water-bath casing layer 2 is enclosed on pipeline system
System is outer, and cryogenic thermostat water bath 3 temperature control below the wax precipitation point of crude oil, it is ensured that pipe-line system Crude Oil wax deposition.
Being incubated water-bath casing layer 2 includes following full of heating in water-bath sleeve pipe, insulation material and tinfoil paper band, the water-bath sleeve pipe
Ring water.
Described differential pressure pick-up high-low pressure interface is connected to the bottom and top of pipe-line system test section, for surveying
Measure experimental section pipeline two ends differential pressure；And differential pressure pick-up is connected with computer, data storage is in computer.
Described temperature sensor is arranged on feed flow kettle, can test fluid temperature (F.T.) in feed flow kettle, it is ensured that temperature parameter
The accuracy of regulation.
The power liquid-supplying system includes the stainless steel feed flow kettle 8 with agitating and heating and screw pump 9 is constituted, described
Stainless steel feed flow kettle 8 is connected with the bottom of pipe-line system reference section, the entrance point and stainless steel feed flow of described screw pump 9
Kettle 8 is connected, and the port of export is connected with the bottom of pipe-line system test section, and then ensures when pipe-line system is disposed vertically, stream
Body is to flow from bottom to top in test section and reference section.Power liquid-supplying system can be according to the shear rate of actual production come really
Determine the displacement range of screw pump, screw pump is furnished with variable frequency adjustment device.
Data acquisition processing system 10 includes analog input card, data acquisition line and data processing equipment, described collection plate
Card is connected with differential pressure pick-up, then inputs computer by data acquisition line；Data acquisition processing system can show reality in real time
Pressure difference, the temperature curve of section are tested, and pumpage is inputted according to actual test, data are reliably preserved.
The present invention sets tungsten alloy coating oil pipe and plain tubing respectively as test section and reference section, due to pipeline section property
Difference, crude oil is also different in each pipeline section wax deposit speed and thickness, causes tungsten alloy coating oil pipe segment difference pressure to be less than common pipeline section
Differential pressure.Different temperatures, displacement variation are also be reflected in differential pressure change, and record differential pressure can carry out different condition wax deposition prediction.
The device can obtain the wax deposition rate of test section and reference section by calculating with each experimental section differential pressure value of Accurate Determining
And the inhibiting rate for wax precipitation of tungsten alloy coating oil pipe.Meanwhile, fluid can also be simulated in vertical bore or water by changing the modes of emplacement of device
The flowing of flat pipeline, simulates the flow of fluid of different fluidised forms, more can truly reflect wax deposition situation of the crude oil in vertical bore.
The dynamic wax control result evaluation method of tungsten alloy coating oil pipe based on Fig. 1 devices, comprises the following steps：
1. oil sample viscosity, the fitting of density with temperature's variation relation：Scene extraction waxy crude oil is removed as sample, according to scene
Producing well actual state setting reasonable temperature gradient is tested, and 5 equal difference gradients in this example from 20~60 DEG C carry out real
Test, obtain viscosity, the density of oil sample at different temperatures, be fitted by software, obtain oil sample density, viscosity with temperature and become
Change relation.Oil sample density p=808.77kg/m during by 17 DEG C at a temperature of relation acquisition formulation experimental program3, oil sample glue
Spend μ=3.6155mPas.
2. in oil pipe fluid flow state determination：According to hydrodynamics, its fluidised form of general condition fluid hose stream can use Reynolds number
Judged.Reynolds number is：
Wherein, Re --- Reynolds number；ρ --- fluid density, kg/m3；μ --- fluid kinematic viscosity, mPas；v——
Mean flow rate, m/s；D0--- the internal diameter (both take identical value) of plain tubing and coating oil pipe, m；Q --- flow, m3/s。
In this example by actual oil well output according to shear rate Similar be empirical flow, numerical value is 3.12L/min, is taken
3L/min。
Reynolds number Re=373.97 under experiment condition can be drawn by calculating, value is less than 2000, belongs to laminar condition.
3. pipeline hydraulic simulation experiment is calculated：Determine that pipe flow pattern is laminar flow, flow resistance in experimentation according to upper step
Coefficient formulas is：
Hydraulic simulation experiment value is calculated for λ=0.1711
4. different oil pipe caliber changing values are calculated：
According to fluid mechanics principle, pipeline processing head loss formula is：
Pipeline frictional head loss can be expressed as again：
It can be obtained according to formula (6) and formula (7)：
It can thus be concluded that：
Wherein, using data acquisition processing system, the pressure difference at test section two ends in pipe-line system is obtained, and then calculating is obtained
The internal diameter of plain tubing and coating oil pipe after wax deposition；
Wherein, after D-- wax deposition plain tubing or coating oil pipe internal diameter, m；hf--- frictional head loss, m；L --- it is general
Oil pipe or coating coiled tubing test section length of pipe, m；Δ P --- plain tubing or coating coiled tubing test pipeline section two ends pressure difference,
Pa；ρ --- fluid density, kg/m3, Q --- flow, m3/s；λ --- hydraulic simulation experiment.
Experiment is 0.381m with the initial bore of oil pipe.In experimentation, collected and surveyed by the data acquisition in device
Test tube two ends differential pressure value, and stored automatically by software, experiment exports data after terminating, when obtaining wax deposition stabilization by analysis
Different coiled tubing test section two ends differential pressure values, can extrapolating coating oil pipe and plain tubing by (5), wax deposition is steady under experimental conditions
Timing bore is respectively Dt=0.335m, Dr=0.311m.
5. coating oil pipe and plain tubing wax deposition amount are calculated：
Calculate tubing wax amount formula be：
Wherein, D0--- initial coating oil pipe or plain tubing internal diameter (both take identical value), m；D --- coating after wax deposition
The internal diameter of oil pipe or plain tubing, m；
Tungsten alloy coating oil pipe and plain tubing when wax deposition is stable under experimental conditions wax deposition amount be respectively mr=418g, mt
=615g
3. the inhibiting rate for wax precipitation of tungsten alloy coating oil pipe is calculated：The formula of inhibiting rate for wax precipitation for calculating tungsten alloy coating oil pipe is：
Wherein, E --- inhibiting rate for wax precipitation, %；mr--- plain tubing wax deposition amount, g；mt--- coating tubing wax amount, g.
It is 32.03% to substitute into numerical value and obtain tungsten alloy coating oil pipe compared with experiment plain tubing inhibiting rate for wax precipitation.
It can be that professional and technical personnel in the field realize or used that examples detailed above, which is intended to illustrate the present invention, and the present invention includes
But above-mentioned embodiment is not limited to, it is any to meet the claims or specification description, meet and principles disclosed herein
With trickle amendment, equivalent substitution and improved method, belong into protection scope of the present invention.
Claims (6)
1. the dynamic wax control result evaluation method of a kind of tungsten alloy coating oil pipe, it is characterised in that comprise the following steps：
Density and viscosity at a temperature of step 1 determination experiment oil sample constant gradient, oil sample viscosity, density are obtained according to the data measured
Vary with temperature graph of a relation；
Graph of a relation and hydrodynamics that step 2 is obtained according to step 1, determine the fluid flow state in oil pipe；
Step 3 calculates the hydraulic simulation experiment of oil pipe according to the fluid flow state obtained in step 2；
The parameter that step 4 is obtained according to step 3, step 2, calculates the caliber changing value of different oil pipes；
The parameter that step 5 is obtained according to step 4, calculates different tubing wax amounts；
The parameter that step 6 is obtained according to step 5, calculates the inhibiting rate for wax precipitation of tungsten alloy coating oil pipe.
2. the dynamic wax control result evaluation method of tungsten alloy coating oil pipe as claimed in claim 1, it is characterised in that step 2
Implementation method is：
According to hydrodynamics, its fluidised form of fluid hose stream can be judged with Reynolds number；
Reynolds number is：
<mrow>
<mi>Re</mi>
<mo>=</mo>
<mfrac>
<mrow>
<msub>
<mi>vD</mi>
<mn>0</mn>
</msub>
<mi>&rho;</mi>
</mrow>
<mi>&mu;</mi>
</mfrac>
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<mrow>
<mn>4</mn>
<mi>&rho;</mi>
<mi>Q</mi>
</mrow>
<mrow>
<msub>
<mi>&pi;&mu;D</mi>
<mn>0</mn>
</msub>
</mrow>
</mfrac>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>1</mn>
<mo>)</mo>
</mrow>
</mrow>
Wherein, Re --- Reynolds number；ρ --- fluid density, kg/m3；μ --- fluid kinematic viscosity, mPas；V --- mean flow
Speed, m/s；D0--- the internal diameter of initial oil pipe, m；Q --- flow, m3/s；
The Reynolds number of the oil sample flowing under setting experiment condition in device is calculated using formula (1), Re≤2000 are laminar flows,
Re >=2000 are turbulent flows.
3. the dynamic wax control result evaluation method of tungsten alloy coating oil pipe as claimed in claim 2, it is characterised in that step 3
Implementation method is：
When being Re≤2000 when fluid flow state is laminar flow, hydraulic simulation experiment calculation formula is：
<mrow>
<mi>&lambda;</mi>
<mo>=</mo>
<mfrac>
<mn>64</mn>
<mi>Re</mi>
</mfrac>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>2</mn>
<mo>)</mo>
</mrow>
</mrow>
The i.e. ε of 2000 ＜ Re ＜ 59.7/ when fluid hose stream belongs to the hydraulically smooth state in turbulent flow8/7When, hydraulic simulation experiment meter
Calculating formula is：
<mrow>
<mi>&lambda;</mi>
<mo>=</mo>
<mfrac>
<mn>0.3164</mn>
<mroot>
<mi>Re</mi>
<mn>4</mn>
</mroot>
</mfrac>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>3</mn>
<mo>)</mo>
</mrow>
</mrow>
I.e. 59.7/ ε when fluid hose stream belongs to the mixed film friction state in turbulent flow8/7During ＜ Re ＜ (665-765lg ε)/ε, waterpower
Friction factor calculating formulas is：
<mrow>
<mfrac>
<mn>1</mn>
<msqrt>
<mi>&lambda;</mi>
</msqrt>
</mfrac>
<mo>=</mo>
<mo>-</mo>
<mn>1.8</mn>
<mi>lg</mi>
<mo>&lsqb;</mo>
<mrow>
<mfrac>
<mn>6.8</mn>
<mi>Re</mi>
</mfrac>
<mo>+</mo>
<msup>
<mrow>
<mo>(</mo>
<mfrac>
<mi>&Delta;</mi>
<mrow>
<mn>3.7</mn>
<mi>d</mi>
</mrow>
</mfrac>
<mo>)</mo>
</mrow>
<mn>1.11</mn>
</msup>
</mrow>
<mo>&rsqb;</mo>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>4</mn>
<mo>)</mo>
</mrow>
</mrow>
When fluid hose stream belongs to the hydraulically rough state in turbulent flow i.e.When, hydraulic simulation experiment is calculated
Formula is：
<mrow>
<mi>&lambda;</mi>
<mo>=</mo>
<mfrac>
<mn>1</mn>
<msup>
<mrow>
<mo>&lsqb;</mo>
<mn>2</mn>
<mi>lg</mi>
<mrow>
<mo>(</mo>
<mn>3.7</mn>
<mi>d</mi>
<mo>/</mo>
<mi>&Delta;</mi>
<mo>)</mo>
</mrow>
<mo>&rsqb;</mo>
</mrow>
<mn>2</mn>
</msup>
</mfrac>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>5</mn>
<mo>)</mo>
</mrow>
</mrow>
Wherein, λ --- hydraulic simulation experiment；ε --- relative roughness, ε=2 Δs/d；Δ --- absolute roughness, mm.
4. the dynamic wax control result evaluation method of tungsten alloy coating oil pipe as claimed in claim 1, it is characterised in that step is 4.
Implementation method is：According to fluid mechanics principle, pipeline processing head loss formula is：
<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>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>6</mn>
<mo>)</mo>
</mrow>
</mrow>
Pipeline frictional head loss is expressed as again：
<mrow>
<msub>
<mi>h</mi>
<mi>f</mi>
</msub>
<mo>=</mo>
<mfrac>
<mrow>
<mi>&Delta;</mi>
<mi>P</mi>
</mrow>
<mrow>
<mi>&rho;</mi>
<mi>g</mi>
</mrow>
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<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
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</mrow>
</mrow>
It can be obtained according to formula (6) and formula (7)：
<mrow>
<mi>&Delta;</mi>
<mi>P</mi>
<mo>=</mo>
<mi>&lambda;</mi>
<mfrac>
<mi>L</mi>
<mi>D</mi>
</mfrac>
<mfrac>
<mrow>
<msup>
<mi>&rho;V</mi>
<mn>2</mn>
</msup>
</mrow>
<mn>2</mn>
</mfrac>
<mo>=</mo>
<mfrac>
<mrow>
<mn>8</mn>
<msup>
<mi>&lambda;L&rho;Q</mi>
<mn>2</mn>
</msup>
</mrow>
<mrow>
<msup>
<mi>&pi;</mi>
<mn>2</mn>
</msup>
<msup>
<mi>D</mi>
<mn>5</mn>
</msup>
</mrow>
</mfrac>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>8</mn>
<mo>)</mo>
</mrow>
</mrow>
It can thus be concluded that：
<mrow>
<mi>D</mi>
<mo>=</mo>
<mroot>
<mfrac>
<mrow>
<msup>
<mi>&Delta;P&pi;</mi>
<mn>2</mn>
</msup>
</mrow>
<mrow>
<mn>8</mn>
<msup>
<mi>&lambda;L&rho;Q</mi>
<mn>2</mn>
</msup>
</mrow>
</mfrac>
<mn>5</mn>
</mroot>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>9</mn>
<mo>)</mo>
</mrow>
</mrow>
Using data acquisition processing system, the pressure difference at test section two ends in pipe-line system is obtained, and then calculating is obtained after wax deposition not
With the internal diameter of oil pipe；
Wherein, after D-- wax deposition oil pipe internal diameter, m；hf--- frictional head loss, m；L --- coiled tubing test section length of pipe, m；
Δ P --- coiled tubing test section two ends pressure difference, Pa；ρ --- fluid density, kg/m3, Q --- flow, m3/s；λ --- flow resistance
Coefficient.
5. the dynamic wax control result evaluation method of tungsten alloy coating oil pipe as claimed in claim 1, it is characterised in that step 5
Implementation method is：The formula for calculating the wax deposition amount of different oil pipes is：
<mrow>
<mi>m</mi>
<mo>=</mo>
<mi>&rho;</mi>
<mi>L</mi>
<mfrac>
<mrow>
<mi>&pi;</mi>
<mrow>
<mo>(</mo>
<msubsup>
<mi>D</mi>
<mn>0</mn>
<mn>2</mn>
</msubsup>
<mo>-</mo>
<msup>
<mi>D</mi>
<mn>2</mn>
</msup>
<mo>)</mo>
</mrow>
</mrow>
<mn>4</mn>
</mfrac>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>10</mn>
<mo>)</mo>
</mrow>
</mrow>
Wherein, D0--- the internal diameter of initial oil pipe, m；D --- the internal diameter of oil pipe, m after wax deposition.
6. the dynamic wax control result evaluation method of tungsten alloy coating oil pipe as claimed in claim 5, it is characterised in that step 6
Implementation method is：The formula of inhibiting rate for wax precipitation for calculating tungsten alloy coating oil pipe is：
<mrow>
<mi>E</mi>
<mo>=</mo>
<mfrac>
<mrow>
<msub>
<mi>m</mi>
<mi>r</mi>
</msub>
<mo>-</mo>
<msub>
<mi>m</mi>
<mi>t</mi>
</msub>
</mrow>
<msub>
<mi>m</mi>
<mi>r</mi>
</msub>
</mfrac>
<mo>&times;</mo>
<mn>100</mn>
<mi>%</mi>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>11</mn>
<mo>)</mo>
</mrow>
</mrow>
Wherein, E --- inhibiting rate for wax precipitation, %；mr--- plain tubing wax deposition amount, g；mt--- coating tubing wax amount, g.
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