CN106971082A - Heavy oil wells viscosity reduction parameter optimization method - Google Patents

Heavy oil wells viscosity reduction parameter optimization method Download PDF

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CN106971082A
CN106971082A CN201710313218.6A CN201710313218A CN106971082A CN 106971082 A CN106971082 A CN 106971082A CN 201710313218 A CN201710313218 A CN 201710313218A CN 106971082 A CN106971082 A CN 106971082A
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water
viscosity reduction
viscosity
temperature
oil
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CN106971082B (en
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张学超
张岩
刘家意
蒋淑婷
张会利
周丽
张清波
李淑兰
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China Petroleum and Chemical Corp
Sinopec Shengli Oilfield Co Gudao Oil Extraction Plant
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Sinopec Shengli Oilfield Co Gudao Oil Extraction Plant
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Abstract

The embodiment of the present invention provides a kind of heavy oil wells viscosity reduction parameter optimization method, including：Mobility parameter determination, including：Target viscosity of thickened oil and the variation relation of temperature are obtained, to determine target viscous crude energy smooth flow and give rise to the sensitive temperature on ground；Mix oil field water successively from low to high into target viscous crude and mixing makes viscous crude and oil field water uniformly emulsify, draw out relation curve between target viscosity of thickened oil and moisture content to obtain, and using this determination have free water abjection when crude oil water content as target viscous crude anti-phase point；Pit shaft heating power viscosity reduction parameter determination, including：The change of temperature during flowing to ground from shaft bottom to target viscous crude, to determine the change curve of mine shaft depth and temperature；To determine the mine shaft depth of heating viscosity reduction according to sensitive temperature；Pit shaft chemical viscosity reduction parameter determination, including：The relation of activating agent, lighter hydrocarbons concentration and viscosity of thickened oil is determined by sampling experimental, the chemical viscosity reduction parameter needed for viscous crude smooth flow is met with determination.

Description

Heavy oil wells viscosity reduction parameter optimization method
Technical field
The present invention relates to technical field of petroleum extraction, and in particular to a kind of heavy oil wells viscosity reduction parameter optimization method.
Background technology
Viscous crude is a kind of many hydro carbons complex mixtures rich in resin and asphalt, and feature is that density is high, viscosity is big, flowing Property is poor, and viscosity reducing, which is usually taken, to be improved its mobility to ensure its normal production development.At present, thick oil well bore viscosity reduction technology master It is divided to pit shaft heating power viscosity reduction and the major class of pit shaft chemical viscosity reduction two：
Pit shaft heating power viscosity reduction is to utilize the temperature sensitive characteristic of viscous crude, makes wellbore fluids by improving fluid temperature (F.T.) in pit shaft Viscosity is reduced.For example：The techniques such as wellbore electric heating, the heating of double hollow stem sealing and circulatings.
Pit shaft chemical viscosity reduction be into wellbore fluids add chemical agent make wellbore fluids turn into oil-in-water emulsion or Oil-in-water type coarse dispersion system is to reduce viscosity of thickened oil, for example：The techniques such as sleeve pipe dosing, sleeve pipe adding active water.
At present, the selection of thick oil well bore viscosity reduction technology is main by viscosity of crude, aqueous, technical maturity condition and process matching The conditional decisions such as degree of perfection, the method point empirical method and recommendation method of selection.
Empirical method is the applicable cases according to early stage technique, and selection is gone by the sense organ of people or by test data perception Technique.This method easily only focuses on things part, phenomenon, outside, lacks the rationality of overall things, inherence and essential laws Understanding.Due to being perceptual selection, influenceed larger by personal subjective idealistic factor, no scientific basis easily exists on craft lectotype Difference.
Recommendation method is the viscosity reduction lifting technology selection standard selection technique formulated according to enterprise.To ensure that it is stronger that standard has Provide that process selection claimed range is more extensive in versatility, usual proposed standard, choosing conditions intersect, full when kinds of processes During sufficient proposed standard, the selection of technique needs to select by empirical method again.
But both modes have relied on the experience of people, it is evident that there is very big uncertainty.
The content of the invention
The problem of for lacking accurate determination heavy oil wells viscosity reduction parameter in the prior art, the skill to be solved of the embodiment of the present invention Art problem is to propose a kind of method that more can accurately determine heavy oil wells viscosity reduction parameter.
In order to solve the above problems, the embodiment of the present invention proposes a kind of heavy oil wells viscosity reduction parameter optimization method, including：
Mobility parameter determination, including：Target viscosity of thickened oil and the variation relation of temperature are obtained, to determine that target is thick Oily energy smooth flow and the sensitive temperature for giving rise to ground；Mix oil field water successively from low to high into target viscous crude and mix and stir Mixing makes viscous crude and oil field water uniformly emulsify, and relation curve between target viscosity of thickened oil and moisture content is drawn out to obtain, and with This determination has the anti-phase point that crude oil water content during free water abjection is target viscous crude；
Pit shaft heating power viscosity reduction parameter determination, including：Temperature during flowing to ground from shaft bottom to target viscous crude Change, to determine the change curve of mine shaft depth and temperature；To determine the mine shaft depth of heating viscosity reduction according to sensitive temperature；
Pit shaft chemical viscosity reduction parameter determination, including：Determine that activating agent, lighter hydrocarbons concentration and viscous crude are viscous by sampling experimental The relation of degree, the chemical viscosity reduction parameter needed for viscous crude smooth flow is met with determination.
2. heavy oil wells viscosity reduction parameter optimization method according to claim 1, it is characterised in that the mobility parameter Determine that step is specifically included：
Measured at interval of 10 DEG C to obtain the variation relation of target viscosity of thickened oil and temperature, to determine target viscous crude energy Smooth flow and the sensitive temperature for giving rise to ground；
5 percentage points of interval mixes oil field water into target viscous crude and mixed successively from low to high makes viscous crude and oil field Water is uniformly emulsified, and moisture content and the pipeline curve of viscosity are drawn out to obtain, and crude oil when having with this determination a free water abjection Moisture content is the anti-phase point of target viscous crude.
3. heavy oil wells viscosity reduction parameter optimization method according to claim 1, it is characterised in that the viscosity reduction parameter is true Determining step also includes：
Hollow stem adding water over pumps parameter determines sub-step, including：It is thick according to the target that mobility parameter determination is determined Relation curve between oil viscosity and moisture content, it is determined that meeting the aqueous watering quantity more than anti-phase point of mixed liquor after water mixing.
4. heavy oil wells viscosity reduction parameter optimization method according to claim 1, it is characterised in that methods described is also wrapped Include：
Double hollow stem sealing and circulating heating parameters determine step, including：Using double hollow stem depth of setting points as boundary, lower access point Following well section takes existing oil recovery equation to calculate；Lower access point above bringing-up section takes below equation to calculate, to be arranged according to recirculated water Amount, circulating water intake temperature, recirculated water return water temperature carry out thermo parameters method simulation, to determine pit shaft minimum temperature and double hollow Bar is rationally lower deep.
θ in formula --- production liquid temperature degree, DEG C；
c1、c2、c3--- coefficient；
r1、r2、r3--- three solutions of characteristic equation；
Z --- any depth, m；
M --- geothermal gradient, DEG C/m；
A --- constant.
Temperature equation parameter c1、c2、c3、r1、r2、r3、a：By Liquid output, the component for producing liquid, flow string and circulation roofbolt Structure, heat penetration, quantity of circulating water, the temperature of recirculated water etc. determine.For day 5~30t/d of liquid, 19~36t/ of quantity of circulating water Under conditions of d, 60~120 DEG C of feed temperature, the insulation of interior hollow stem and thermal conductivity factor 0.087, the coefficient for giving equation is recommended Scope, see the table below.
Closed hot water circuit parameter recommended range table
5. heavy oil wells viscosity reduction parameter optimization method according to claim 1, it is characterised in that methods described is also wrapped Include：
Wellbore electric heating parameter determination, including：The production liquid temperature degree recovered the oil according to electrical heating determines pit shaft heating power Parameter：
θ=A+mz+Ce-(zH-z)/B
Wherein θ is production liquid temperature degree；
A is coefficient, A=tz0+(N+mW)/K；
N is line heating power, N=heating powers/heat penetration；
B is coefficient, B=W/K；
W is production liquid water equivalent ,/DEG C, W=QWater-carrying capacity(Kg/h)×CWater specific heat+QOily flow(Kg/h)×COily specific heat
QWater-carrying capacityFor the water flowed through per hour
QOily flowFor the oil mass flowed through per hour
CWater specific heatFor the specific heat capacity of water
COily specific heatFor the specific heat capacity of oil
K is heat transfer coefficient)；
Z is arbitrfary point depth；
M is geothermal gradient；
C is coefficient, C=tzH-A-m·zH；
tz0Liquid temperature degree is produced for pithead position pit shaft；
tzHLiquid temperature degree is produced for hot spot pit shaft；
zHFor hot spot depth.
6. heavy oil wells viscosity reduction parameter optimization method according to claim 1, it is characterised in that methods described is also wrapped Include：
Sleeve pipe mixes activating agent parameter determination, including：The work that sub-step is determined is determined according to pit shaft chemical viscosity reduction parameter Property agent, lighter hydrocarbons concentration and viscosity of thickened oil relation, calculate thinner consumption：
In formula
QDropFor thinner consumption, kg；
QMixFor watering quantity, m3；
QLiquidFor oilwell produced fluid amount, m3；
CDropConcentration, % are recommended for Lab-evaluation thinner.
7. the heavy oil wells viscosity reduction parameter optimization method according to claim any one of 2-6, it is characterised in that the side Method also includes：
Economic Evaluation step, including：
Hollow stem adding water over pumps cost calculation sub-step, including：Calculating hollow stem, water-doped viscosity reduction apparatus, ground are mixed respectively Water pipeline, individual well water mixing heating furnace expense, according to the amortization of different depreciable lifes to daily, calculate equipment amortization charge；Calculate respectively Water mixing expenditure on power and water mixing heating take, and add up to hollow stem adding water over pumps day operation total cost；
Double hollow stem sealing and circulating heating costs calculate sub-step, including：Calculate respectively double hollow stems, Vacuumized continuous tube, Circulating heater expense, according to the amortization of different depreciable lifes to daily, calculates a day amortization charge；Final-period management, combustion are calculated respectively Material expense and operation power charge, add up to double hollow stem sealing and circulating heating day operation total costs；
Wellbore electric heating cost calculation sub-step, including：Respectively computing device take, technical service fee and operation power charge, conjunction Count out wellbore electric heating day operation total cost；
Sleeve pipe mixes activating agent cost calculation sub-step, including：Medicine machine, activating agent, operation power charge and fortune are calculated respectively Row administration fee, adds up to sleeve pipe to mix activating agent day operation total cost；
The viscosity reducing process for determining to use according to above result of calculation.
The above-mentioned technical proposal of the present invention has the beneficial effect that：Above-mentioned technical proposal proposes a kind of heavy oil wells viscosity reduction ginseng Number optimization method, carries out rheology test by the crude oil to target block, determines that viscous crude smoothly can give rise to ground from oil reservoir When the needs such as anti-phase point, sensitive temperature point critical condition, can put into the viscosity reduction technique of application for scene, it is full according to needing The critical condition of foot determines most rational viscosity reduction technological parameter, determines after viscosity reduction technological parameter, calculates process costs, preferably go out through Ji property most strong viscosity reducing technique.
Brief description of the drawings
Fig. 1 is the schematic flow sheet of the embodiment of the present invention.
Embodiment
To make the technical problem to be solved in the present invention, technical scheme and advantage clearer, below in conjunction with accompanying drawing and tool Body embodiment is described in detail.
The embodiment of the present invention proposes a kind of heavy oil wells viscosity reduction parameter optimization method, can pass through the crude oil to target block Development rheology test determines the critical of the needs such as anti-phase point, the sensitive temperature point when viscous crude smoothly can give rise to ground from oil reservoir Condition, the viscosity reduction technique of application can be put into for scene, and most rational viscosity reduction technique is determined according to the critical condition for needing to meet Parameter, is determined after viscosity reduction technological parameter, calculates process costs, preferably goes out economy most strong viscosity reducing technique.
1st, rheology study
Sensitive temperature：Using pit shaft heating power viscosity reduction technology oil well, foundation《Viscosity determining procedure》GB/T 10247-2008 are marked Quasi- method, tests out the relation of target viscosity of thickened oil and temperature, finds out target viscous crude energy smooth flow and gives rise to the quick of ground Temperature-sensitive degree.
Anti-phase point:Using pit shaft chemical viscosity reduction technology oil well, foundation《Heavy oil wells water mixing technology condition》Q/SH1020 Defined in 0155-2014, anti-phase point refers to condensation (maximum) moisture content of oil-water mixture when apparent viscosity is maximum.When containing When water rate is higher than at anti-phase, the viscosity of mixed liquor will decline to a great extent, and mixed liquor is transformed into O/W types by w/o type, and this is " anti-phase ", The viscosity reduction of viscous crude is conducive to exploit and convey.Method of testing is to mix oil field water successively from low to high into target viscous crude, mixing Stirring makes viscous crude and oil field water uniformly emulsify, and test has crude oil water content during free water abjection to be the anti-phase of target viscous crude Point.
2nd, the determination of viscosity reduction parameter
(1) determination of pit shaft heating power viscosity reduction parameter
Flow to the process on ground from shaft bottom to target viscous crude, carry out well bore temperature distribution simulation, simulate different water cut, no Under the conditions of liquid measure, pit shaft draws out mine shaft depth and the relation curve of temperature along journey temperature distributing rule, finds temperature change Rule.
Using the oil well of pit shaft heating power viscosity reduction technology, it is ensured that target viscous crude energy smooth flow simultaneously gives rise to ground, it is desirable to well The production liquid temperature degree of cylinder arbitrfary point is greater than sensitive temperature, according to the mine shaft depth and temperature curve simulated, determines heating power viscosity reduction The parameters such as heat penetration, the power of technique.
(2) determination of pit shaft chemical viscosity reduction parameter
Using the oil well of water-doped viscosity reduction technology, it is desirable to mix after water, production fluid comprehensive water cut is more than anti-phase point, is conducive to thick Oil flowing.Using the chemical viscosity reduction technology oil well such as activating agent, lighter hydrocarbons is mixed, sampling carries out experiment Lab-evaluation, draw out activating agent, The relation curve of lighter hydrocarbons concentration and viscosity, it is determined that meeting activating agent required during viscous crude smooth flow, lighter hydrocarbons concentration parameter.
3rd, Economic Evaluation selects well
Calculate the day amortization charge of various viscosity reducing techniques, the minimum technique of selection day amortization charge.
Day, amortization charge was equal to equipment day amortization charge and day operation expense sum.Equipment day amortization charge is according to equipment one Secondary property input cost is calculated with the depreciable life；Day operation expense calculates daily required heating expense and living according to viscosity reduction parameter The expenses such as property agent.
Illustrated below with a specific example：
The viscosity of crude 5000mPa/s of certain oil well, produces liquid 10t/d, day oil-producing 5t/d, aqueous 50%, reservoir depth daily 1200m, 70 DEG C of reservoir temperature, hydrodynamic face 600m heavy oil wells.It can not be produced using conventional DP technology, it is necessary to using heavy oil wells Cylinder viscosity reduction technology viscosity reduction.The conventional viscosity reducing technology of certain oil field unit has hollow stem adding water over pumps, double hollow stem sealing and circulatings Activating agent is mixed in heating, wellbore electric heating technology, sleeve pipe, and optimal viscosity reduction technology optional step is as follows：
Rheology study
10 DEG C of interval, tests out target viscosity of thickened oil and the variation relation of temperature, finds out target viscous crude energy smooth flow simultaneously The sensitive temperature on ground is given rise to, it is 54 DEG C to determine sensitive temperature.It is as shown in Figure 2 for viscosity and temperature curve.
5 percentage points of interval, oil field water is mixed into target viscous crude successively from low to high, and mixing makes viscous crude and oil field Water is uniformly emulsified, and test has the anti-phase point that crude oil water content during free water abjection is target viscous crude, continues water mixing to moisture content 98% is reached, moisture content and the relation curve of viscosity is drawn out, aqueous and viscosity changing rule is found out, determines target viscous crude energy The smooth flow and moisture content for giving rise to ground is 85%.It is as shown in Figure 3 for viscosity and aqueous relation curve.
2nd, the determination of viscosity reduction parameter
(1) determination of pit shaft heating power viscosity reduction parameter
Every 100 meters, survey produced liquid in oil well from oil reservoir flow to well head during along journey Temperature Distribution value, draw out pit shaft deep The relation curve of degree and temperature, finds temperature changing regularity.As shown in Figure 4 produces liquid temperature degree along journey distribution song for well wellbore Line.
Heating viscosity reduction is taken, 60 DEG C of sensitive temperature produces liquid temperature degree along journey distribution curve rule by well wellbore, it is determined that rising The rational heating depth 950m of temperature drop temperature technique.
(2) determination of pit shaft chemical viscosity reduction parameter
It is as shown in Figure 5 for viscosity reduction agent concentration and the relation curve of viscosity.Foundation《Reducing thick oil viscosity technical requirements standard》Q/ SH0055-2007 viscosity break ratio testing standards, by viscous crude in the water bath with thermostatic control of (50 ± 1) DEG C constant temperature 1h, sequentially add 1000mg/ L, 1500mg/l, 2000mg/l, 2500mg/l, 3000mg/l, 3500mg/l, 4000mg/l, 4500mg/l, 5000mg/l, 5500mg/l, 6000mg/l thinner, stirring remove wherein free water and bubble, are measured with rotary viscosity rapidly its (50 ± 1) DEG C when viscosity.Measuring pit shaft chemical viscosity reduction rationally adds thinner concentration parameter to be 2 ‰.
(3) hollow stem adding water over pumps parameter
According to viscosity and aqueous relation curve, it is necessary to meet that mixed liquor after water mixing is aqueous to be more than sensitive aqueous (85%), really Fixed reasonable watering quantity 35m3/ d, water mixing temperature 50 C.
(4) double hollow stem sealing and circulating heating parameters
The optimization of circulating hot water parameter is calculated according to closed hot water circulation heated section production liquid temperature equation, closed hot water Circulating-heating section production liquid temperature equation is as follows：
θ in formula --- production liquid temperature degree, DEG C；
c1、c2、c3--- coefficient；
r1、r2、r3--- three solutions of characteristic equation；
Z --- any depth, m；
M --- geothermal gradient, DEG C/m；
A --- constant.
Temperature equation parameter c1、c2、c3、r1、r2、r3、a：By Liquid output, the component for producing liquid, flow string and circulation roofbolt Structure, heat penetration, quantity of circulating water, the temperature of recirculated water etc. determine.For day 5~30t/d of liquid, 19~36t/ of quantity of circulating water Under conditions of d, 60~120 DEG C of feed temperature, the insulation of interior hollow stem and thermal conductivity factor 0.087, the coefficient for giving equation is recommended Scope, see the table below.
Closed hot water circuit parameter recommended range table
The production liquid temperature degree of whole pit shaft is divided into 2 sections：Using double hollow stem depth of setting points as boundary, the lower following well section of access point is taken Conventional oil recovery equation is calculated；Lower access point above bringing-up section takes above-mentioned equation to calculate.
Determine rational recirculated water discharge capacity 28m3/ d, 90 DEG C of circulating water intake temperature, 68.5 DEG C of recirculated water return water temperature. Simulated according to thermo parameters method, pit shaft minimum temperature reaches 54 DEG C, and double hollow stems rationally descend depth 950m.
(5) wellbore electric heating
The parameter of pit shaft heating power is calculated according to the production liquid temperature equation that electrical heating is recovered the oil, electric heater section production liquid temperature degree side Journey is as follows：
θ=A+mz+Ce-(zH-z)/B
Wherein θ is production liquid temperature degree；
A is coefficient, A=tz0+(N+mW)/K；
N is line heating power, and unit is w/m, N=heating powers/heat penetration；
B is coefficient, B=W/K；
K is heat transfer coefficient, and unit is w/ (m DEG C)；
Z is arbitrfary point depth, and unit is m；
M is low temperature gradients, unit for DEG C/m；
C is coefficient, C=tzH-A-m·zH；
tz0Liquid temperature degree is produced for pithead position pit shaft；
tzHFor hot spot pit shaft produce liquid temperature degree, unit for DEG C；
zHFor hot spot depth；Unit is m.
Using heat penetration point as boundary, distribution is taken to calculate.
Technical data optimizes and computational methods formula, and it is 56.2W/m to calculate outlet heating power, according to 4.4 temperature Field distribution is simulated, day liquid 15t/d, and aqueous 50%, pit shaft minimum temperature reaches 54 DEG C, and hollow stem rationally descends depth 950m.Calculate Electrical heating power=56.2W/m × 700m/1000=39.34kW.
(6) sleeve pipe mixes active agent parameter
According to stick concentration and the relation of viscosity, rational drug concentration is 2 ‰, calculates rational thinner consumption.
Wherein QDropFor thinner consumption, unit is kg；QMixFor watering quantity, unit is m3；QLiquidFor oilwell produced fluid amount, unit is m3；CDropConcentration is recommended for Lab-evaluation thinner.
Rational thinner consumption is calculated for 10kg/d according to above formula.
3rd, Economic Evaluation selects well
(1) hollow stem adding water over pumps
Hollow stem, water-doped viscosity reduction apparatus, ground watering pipeline, individual well water mixing heating furnace expense are calculated respectively, according to difference Depreciable life amortization calculates equipment amortization charge to daily；Water mixing expenditure on power is calculated respectively and water mixing heating takes, and adds up to hollow stem Adding water over pumps day operation total cost is 210.5 yuan/day.
Hollow stem adding water over pumps economic evaluation
(2) double hollow stem sealing and circulating heating
Double hollow stem, Vacuumized continuous tube, circulating heater expenses are calculated respectively, according to the amortization of different depreciable lifes to often Day, calculate a day amortization charge.Final-period management, fuel cost and operation power charge are calculated respectively, add up to double hollow stem sealing and circulatings to add Summerday operation total cost is 294.5 yuan/day.
Double hollow stem sealing and circulatings heat economic evaluation
(3) wellbore electric heating
Respectively computing device take, technical service fee and operation power charge, add up to the wellbore electric heating day operation total cost be 294.5 member/day.
Wellbore electric heating economic evaluation
(4) sleeve pipe mixes active agent parameter
Measuring and calculating medicine machine, activating agent, operation power charge and operational and administrative expenses, add up to sleeve pipe to mix activating agent day fortune respectively Row total cost is 294.5 yuan/day.
Sleeve pipe mixes activating agent economic evaluation
(5) economic evaluation conclusion
Determined by technological parameter, integrated economics evaluation result, viscosity of crude 5000mPa/s, produce liquid 10t/d, daily output daily Oily 5t/d, aqueous 50%, reservoir depth 1200m, 70 DEG C of reservoir temperature, hydrodynamic face 600m heavy oil wells are most economical rational thick Oily viscosity reducing technology is that sleeve pipe mixes activating agent.
Viscosity reduction technology evaluation table
The present invention proposes a kind of heavy oil wells viscosity reduction parameter optimization method, it is proposed that a kind of brand-new heavy oil wells wellbore lift Viscosity reduction auxiliary process preferred template, based on crude viscosity, well water, daily flow as process selection condition, class science, Quickly select viscosity reduction technique.Heavy oil wells wellbore lift viscosity reduction auxiliary process preferred template has considered parameter optimization and technique Using economy, this method needs protection.
The method of the embodiment of the present invention has the advantage that：
1st, with temperature in wellbore field stimulation, viscosity reduction Process operating parameters are optimized；
2nd, using day amortization charge as target, viscosity reduction process economy is evaluated；
3rd, combined process adaptability and economy, the heavy oil wells wellbore lift viscosity reduction auxiliary process preferred template of invention.
The present invention proposes a kind of heavy oil wells viscosity reduction parameter optimization method, in process parameter optimizing and Economic Evaluation basis On, heavy oil wells wellbore lift viscosity reduction auxiliary process preferred template of the invention, with science.Compared with empirical method, it will can drop The selection of viscous lifting technology is changed from perception to rationality, improves the reasonability of process selection；Compared with recommendation method, technique has been refined Choosing conditions, can be changed the selection of viscosity reduction lifting technology from extensive style to fine type, improve technique application specific aim and Economy.
Described above is the preferred embodiment of the present invention, it is noted that for those skilled in the art For, on the premise of principle of the present invention is not departed from, some improvements and modifications can also be made, these improvements and modifications It should be regarded as protection scope of the present invention.

Claims (7)

1. a kind of heavy oil wells viscosity reduction parameter optimization method, it is characterised in that including：
Mobility parameter determination, including：Target viscosity of thickened oil and the variation relation of temperature are obtained, to determine target viscous crude energy Smooth flow and the sensitive temperature for giving rise to ground；Mixing oil field water successively from low to high into target viscous crude and mixing makes Viscous crude and oil field water are uniformly emulsified, and the relation curve between target viscosity of thickened oil and moisture content is drawn out with acquisition, and true with this Surely there is the anti-phase point that crude oil water content during free water abjection is target viscous crude；
Pit shaft heating power viscosity reduction parameter determination, including：The change of temperature during flowing to ground from shaft bottom to target viscous crude, To determine the change curve of mine shaft depth and temperature；To determine the mine shaft depth of heating viscosity reduction according to sensitive temperature；
Pit shaft chemical viscosity reduction parameter determination, including：Activating agent, lighter hydrocarbons concentration and viscosity of thickened oil are determined by sampling experimental Relation, the chemical viscosity reduction parameter needed for viscous crude smooth flow is met with determination.
2. heavy oil wells viscosity reduction parameter optimization method according to claim 1, it is characterised in that the mobility parameter is determined Step is specifically included：
Measured at interval of 10 DEG C to obtain the variation relation of target viscosity of thickened oil and temperature, to determine that target viscous crude can be smoothly Flow and give rise to the sensitive temperature on ground；
Mixing oil field water successively from low to high into target viscous crude at interval of 5 percentage points and mix makes viscous crude and oil field water Uniform emulsification, draws out moisture content and the pipeline curve of viscosity, and have crude oil during free water abjection to contain with this determination to obtain Water rate is the anti-phase point of target viscous crude.
3. heavy oil wells viscosity reduction parameter optimization method according to claim 1, it is characterised in that the viscosity reduction parameter determines step Suddenly also include：
Hollow stem adding water over pumps parameter determines sub-step, including：Glued according to the target viscous crude that mobility parameter determination is determined Relation curve between degree and moisture content, it is determined that meeting the aqueous watering quantity more than anti-phase point of mixed liquor after water mixing.
4. heavy oil wells viscosity reduction parameter optimization method according to claim 1, it is characterised in that methods described also includes：
Double hollow stem sealing and circulating heating parameters determine step, including：Using double hollow stem depth of setting points as boundary, below lower access point Well section takes existing oil recovery equation to calculate；Lower access point above bringing-up section takes below equation to calculate, with according to recirculated water discharge capacity, follow Ring water inlet temperature, recirculated water return water temperature carry out thermo parameters method simulation, to determine that pit shaft minimum temperature and double hollow stems are closed Reason is lower deep；
θ = c 1 e r 1 z + c 2 e r 2 z + c 3 e r 3 z + m z + a
θ in formula --- production liquid temperature degree, DEG C；
c1、c2、c3--- coefficient；
r1、r2、r3--- three solutions of characteristic equation；
Z --- any depth, m；
M --- geothermal gradient, DEG C/m；
A --- constant.
Temperature equation parameter c1、c2、c3、r1、r2、r3、a：At least determined by following parameter:Liquid output, the component for producing liquid, production Structure, heat penetration, quantity of circulating water, the temperature of recirculated water of tubing string and circulation roofbolt.
5. heavy oil wells viscosity reduction parameter optimization method according to claim 1, it is characterised in that methods described also includes：
Wellbore electric heating parameter determination, including：The production liquid temperature degree recovered the oil according to electrical heating determines the ginseng of pit shaft heating power Number：
θ=A+mz+Ce-(zH-z)/B
Wherein θ is production liquid temperature degree；
A is coefficient, A=tz0+(N+mW)/K；
N is line heating power, N=heating powers/heat penetration；
B is coefficient, B=W/K；
W is production liquid water equivalent ,/DEG C, W=QWater-carrying capacity(Kg/h)×CWater specific heat+QOily flow(Kg/h)×COily specific heat
QWater-carrying capacityFor the water flowed through per hour
QOily flowFor the oil mass flowed through per hour
CWater specific heatFor the specific heat capacity of water
COily specific heatFor the specific heat capacity of oil
K is heat transfer coefficient)；
Z is arbitrfary point depth；
M is geothermal gradient；
C is coefficient, C=tzH-A-m·zH；
tz0Liquid temperature degree is produced for pithead position pit shaft；
tzHLiquid temperature degree is produced for hot spot pit shaft；
zHFor hot spot depth.
6. heavy oil wells viscosity reduction parameter optimization method according to claim 1, it is characterised in that methods described also includes：
Sleeve pipe mixes activating agent parameter determination, including：According to pit shaft chemical viscosity reduction parameter determine sub-step determine activating agent, The relation of lighter hydrocarbons concentration and viscosity of thickened oil, calculates thinner consumption：
In formula
QDropFor thinner consumption, kg；
QMixFor watering quantity, m3；
QLiquidFor oilwell produced fluid amount, m3；
CDropConcentration, % are recommended for Lab-evaluation thinner.
7. the heavy oil wells viscosity reduction parameter optimization method according to claim any one of 2-6, it is characterised in that methods described is also Including：
Economic Evaluation step, including：
Hollow stem adding water over pumps cost calculation sub-step, including：Hollow stem, water-doped viscosity reduction apparatus, ground watering pipe are calculated respectively Line, individual well water mixing heating furnace expense, according to the amortization of different depreciable lifes to daily, calculate equipment amortization charge；Water mixing is calculated respectively Expenditure on power and water mixing heating take, and add up to hollow stem adding water over pumps day operation total cost；
Double hollow stem sealing and circulating heating costs calculate sub-step, including：Double hollow stem, Vacuumized continuous tube, circulations are calculated respectively Heater expense, according to the amortization of different depreciable lifes to daily, calculates a day amortization charge；Final-period management, fuel cost are calculated respectively With and operation power charge, add up to double hollow stem sealing and circulatings heating day operation total costs；
Wellbore electric heating cost calculation sub-step, including：Respectively computing device take, technical service fee and operation power charge, add up to Wellbore electric heating day operation total cost；
Sleeve pipe mixes activating agent cost calculation sub-step, including：Measuring and calculating medicine machine, activating agent, operation power charge and operation are managed respectively Reason expense, adds up to sleeve pipe to mix activating agent day operation total cost；
The viscosity reducing process for determining to use according to above result of calculation.
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