CN109001079A - A kind of self-diverting acid becomes sticky characteristic measurement system and method - Google Patents
A kind of self-diverting acid becomes sticky characteristic measurement system and method Download PDFInfo
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- CN109001079A CN109001079A CN201710419062.XA CN201710419062A CN109001079A CN 109001079 A CN109001079 A CN 109001079A CN 201710419062 A CN201710419062 A CN 201710419062A CN 109001079 A CN109001079 A CN 109001079A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
- G01N11/10—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by moving a body within the material
- G01N11/14—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by moving a body within the material by using rotary bodies, e.g. vane
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
Abstract
It becomes sticky characteristic measurement system and method the invention discloses a kind of self-diverting acid, belongs to fluid property evaluation field.The system includes: the reaction kettle for being provided with rabbling mechanism, is provided with inlet and sample tap on the side wall of reaction kettle.The side of reaction kettle is arranged in core holding unit, for fixing rock core, and contacts rock core end face with acid solution in reaction kettle.In-line viscometer, is arranged in side opposite with core holding unit on reaction kettle, and the inner cavity of reaction kettle is protruded on the detection head of in-line viscometer.Potentiometric titrimeter, for measuring the acid concentration of self-diverting acid in reaction kettle.Self-diverting acid provided by the invention becomes sticky characteristic measurement system, can carry out dynamic measurement to the characteristic that becomes sticky of self-diverting acid, and measurement result is accurate, easy to use, is suitable for large-scale promotion application.
Description
Technical field
The present invention relates to fluid properties to evaluate field, in particular to a kind of self-diverting acid becomes sticky characteristic measurement system and side
Method.
Background technique
Carbonate reservoir matrix permeability is lower, heterogeneity is strong, is unfavorable for the exploitation of petroleum, natural gas etc..Pass through
Using self-diverting acid, especially viscoelastic surfactant self-diverting acid, homogeneous acidification can be carried out to carbonate reservoir and changed
It makes, improves the permeability of carbonate reservoir and the use rate of reservoir, convenient for the exploitation of petroleum, natural gas etc..Different component
Self-diverting acid, the characteristic that becomes sticky such as the range that becomes sticky, ultimate viscosity number is all different, and the construction for the carbonate reservoir being applicable in is not yet
Together, therefore, it is necessary to the characteristics that becomes sticky to self-diverting acid to evaluate, with suitable certainly according to the selection of the construction of carbonate reservoir
Acid is turned to, and according to the parameters such as characteristic optimizing operational discharge capacity, construction time that become sticky of self-diverting acid.So providing a kind of rotation
The test device of characteristic is become sticky to acid and method is very necessary.
The prior art by rotational viscometer to viscoelastic surfactant self-diverting acid viscosity at different conditions into
Row measurement, specific measuring method are as follows: the viscoelastic surfactant self-diverting acid of equivalent is added into 10 beakers, then to the
The rock powder (or Paris white, the available Paris white replacement of rock powder mentioned below) of predetermined quality is added in one beaker, to
Second, third ... sequentially add the rock powder of 2 times of predetermined quality, 3 times ... 10 times in the tenth beaker, and should ensure that the
The rock powder quality being added in ten beakers is excessive.At 90 DEG C, make the rock powder and Viscoelastic surfactant in each beaker
Agent self-diverting acid reacts in a static condition, until reaction bubble-free generates, illustrates that reaction terminates.Then, viscous with rotation
Degree meter measurement 170s-1Under conditions of in each beaker liquid viscosity, and differential responses are drawn with this and match liquid in lower beaker
Viscosity change curve, so that it is determined that being directed to for certain rock powder, viscoelastic surfactant self-diverting acid becomes sticky the time
And attainable ultimate viscosity number, in order to the selection and use of viscoelastic surfactant self-diverting acid.
Inventor has found that the prior art at least has following technical problem:
The viscoelastic surfactant self-diverting acid that the prior art provides becomes sticky in characteristic measurement method, and viscoelastic surface is living
Property agent self-diverting acid reacted in a static condition with rock powder, the reaction condition and viscoelastic surfactant self-diverting acid are in underground
It is larger with condition gap when carbonate reservoir real reaction, it is therefore possible for the detected that become sticky range and ultimate viscosity number it is not quasi- enough
It really, cannot effective guiding construction parameter optimization.
Summary of the invention
The technical problem to be solved by the embodiment of the invention is that provide it is a kind of can to self-diverting acid become sticky characteristic into
Mobile state measurement, and measurement result is accurate, and self-diverting acid becomes sticky characteristic measurement system and method, and specific technical solution is as follows:
In a first aspect, become sticky characteristic measurement system the embodiment of the invention provides a kind of self-diverting acid, the system comprises:
It is provided with the reaction kettle of rabbling mechanism, is provided with inlet and sample tap on the side wall of the reaction kettle.
The side of the reaction kettle is arranged in core holding unit, for fixing rock core, and makes rock core end face and described anti-
The acid solution in kettle is answered to contact.
Side opposite with the core holding unit on the reaction kettle, the online viscosity is arranged in in-line viscometer
The inner cavity of the reaction kettle is protruded on the detection head of meter.
Potentiometric titrimeter, for measuring the acid concentration of self-diverting acid in the reaction kettle.
Specifically, preferably, the system also includes still preheater, the inlet of the still preheater and the reaction kettle is logical
Cross transfer line connection.
Specifically, preferably, the detector portion of the in-line viscometer is located at below the rabbling mechanism at 2-3cm；
The in-line viscometer is electrically connected to data collection system.
Specifically, preferably, the outer wall of the core holding unit is loaded with a plurality of confining pressure, pipeline is vertical to be connect, described to enclose
Pressure load pipeline is connected to confining pressure loading system.
Second aspect is become sticky the side of characteristic the embodiment of the invention provides a kind of using above-mentioned system measurement self-diverting acid
Method, which comprises
Rock core is obtained, the rock core is put into core holding unit.
The self-diverting acid of predetermined amount, predetermined temperature is injected into reaction kettle through inlet, the reaction is made by rabbling mechanism
The self-diverting acid in kettle is rotated with desired speed, and the self-diverting acid is made to react with the rock core.
The real time measure is carried out by viscosity of the in-line viscometer to the self-diverting acid, obtains the viscosity of the self-diverting acid
Versus time curve obtains become sticky period and ultimate viscosity number.
Every preset time, sample is taken out from the sample tap of the reaction kettle, by potentiometric titrimeter to the sample
Acid concentration be measured, the acid concentration versus time curve is drawn, according to the period that the becomes sticky corresponding time
Section obtains the self-diverting acid in the acid concentration to become sticky in the period in the acid concentration versus time curve
Range.
Specifically, preferably, described rock core is put into core holding unit includes: that packing element is sleeved on outside the rock core
Portion is then placed in the inner cavity of the core holding unit, and applies the confining pressure of 5-8MPa to the rock core.
Specifically, preferably, the pressure in the reaction kettle is 4-7Mpa.
Specifically, preferably, the desired speed is calculated by the following method:
Obtain the initial viscosity that the operational discharge capacity of self-diverting acid, self-diverting acid when acidification is transformed are carried out to carbonate reservoir
It is high with the radius of rotating vane, the average slit width of default acid-etched fracture and average seam in initial density, the rabbling mechanism, pass through
Formula a and formula b calculates Reynolds number of the self-diverting acid in the carbonate reservoir；
Wherein, Q is operational discharge capacity, m3/min；For mean flow rate, m/s；High, the m for average seam；For average seam
Width, cm；ρ is initial density, g/cm3；μ is initial viscosity, MPas；ReFor Reynolds number；
The Reynolds number numerical value that the self-diverting acid flows in the carbonate reservoir is existed as the self-diverting acid
The desired speed is calculated by formula c and formula d in Reynolds number numerical value in the reaction kettle when rotation；
ω R=2 π nR formula d
Wherein, ω is angular speed, s-1；R is the radius of rotating vane, cm；N is desired speed, r/min.
Specifically, preferably, the acquisition becomes sticky, the period includes:
According to slope, the viscosity versus time curve of the self-diverting acid is in turn divided into initial stage, viscosity
Increase stage, viscosity reduce stage and later stage.
Make the tangent line in each stage, it is institute that the tangent line of the initial stage and the viscosity, which increase the intersection point of the tangent line in stage,
Point at the beginning of becoming sticky the period is stated, it is institute that the viscosity, which reduces the tangent line in stage and the intersection point of the tangent line of the later stage,
State the end time point for the period that becomes sticky.
Period between the sart point in time and end time point is described becomes sticky the period.
Specifically, preferably, the preset time is 0.5-3min.
Technical solution provided in an embodiment of the present invention has the benefit that
Self-diverting acid provided in an embodiment of the present invention becomes sticky characteristic measurement system, is self-diverting acid and rock core by reaction kettle
Reaction compartment is provided, by the way that rabbling mechanism is arranged in reaction kettle, the self-diverting acid in reaction kettle is made to keep scheduled angular speed
Rotation, with simulate self-diverting acid carbonate reservoir it is practical flow when state, make the self-diverting acid measured viscosity number and
The characteristic that becomes sticky is closer to truthful data.By the way that in-line viscometer to be arranged in side opposite with core holding unit on reaction kettle,
And protrude into the detection head of in-line viscometer in the inner cavity of reaction kettle, to the self-diverting acid viscosity after sufficiently being reacted with rock core
It is measured, improves the reliability of measurement result.By in-line viscometer and potentiometric titrimeter respectively to the viscosity of self-diverting acid
Real-time monitoring is carried out with acid concentration, and respectively obtains self-diverting acid viscosity and acid concentration versus time curve, in order to grasp
Make the process that becomes sticky that personnel understand self-diverting acid, makes low damage in become sticky period and the period for obtaining according to change curve
The acid concentration range of acid is more accurate.The characteristic measurement system as it can be seen that self-diverting acid provided in an embodiment of the present invention becomes sticky, can be right
The characteristic that becomes sticky of self-diverting acid carries out dynamic measurement, and measurement result is accurate, easy to use, is suitable for large-scale promotion application.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is that self-diverting acid provided in an embodiment of the present invention becomes sticky the structure chart of characteristic measurement system；
Fig. 2 is the schematic shapes of rock core provided in an embodiment of the present invention；
Fig. 3 is the schematic diagram that the viscosity of self-diverting acid in the embodiment of the present invention 2 changes over time；
Fig. 4 is the schematic diagram of the period finding process provided in an embodiment of the present invention that becomes sticky；
Fig. 5 is the schematic diagram that the acid concentration of self-diverting acid in the embodiment of the present invention 2 changes over time.
Appended drawing reference respectively indicates:
1 reaction kettle,
2 core holding units,
3 in-line viscometers,
4 potentiometric titrimeters,
5 still preheaters,
6 data collection systems
7 confining pressure loading systems.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, embodiment of the present invention will be made into one below
Step ground detailed description.
In a first aspect, become sticky characteristic measurement system the embodiment of the invention provides a kind of self-diverting acid, as shown in Fig. 1,
The system includes: the reaction kettle 1 for being provided with rabbling mechanism, is provided with inlet and sample tap on the side wall of reaction kettle 1.
The side of reaction kettle 1 is arranged in core holding unit 2, for fixing rock core, and makes rock core end face and reaction kettle 1
Middle acid solution contact.
Side opposite with core holding unit 2 on reaction kettle 1, the detection of in-line viscometer 3 is arranged in in-line viscometer 3
The inner cavity of reaction kettle 1 is protruded on head.
Potentiometric titrimeter 4, for measuring the acid concentration of self-diverting acid in reaction kettle 1.
Self-diverting acid provided in an embodiment of the present invention become sticky characteristic measurement system working principle it is as follows:
The rock core for obtaining predefined size, rock core is put into core holding unit 2, keeps rock core end face and 1 wall surface of reaction kettle flat
Together, 5~8MPa confining pressure is loaded by confining pressure loading system.
The self-diverting acid of predetermined temperature, predetermined amount is injected into reaction kettle 1 through inlet, reaction kettle 1 is made by rabbling mechanism
Interior self-diverting acid is rotated with desired speed, and self-diverting acid is made to react with rock core.Self-diverting acid includes acid solution and diversion agent,
Wherein, after acid solution and rock core react, the H in acid solution+It reduces, the acid concentration of acid solution reduces, pH value increases, while generating big
The Ca of amount2+、Mg2+, so that steering agent molecule is changed into worm micella from spherical micelle or rigid rod micella, being fused into has sky
Between reticular structure jelly system, to make self-diverting acid viscosity increase and there is certain elasticity.Acid solution has been reacted with rock core
Bi Hou, with the raising of pH value, vermiculate glues converts to globular micelle and breaks glue automatically, and the viscosity of self-diverting acid gradually subtracts
Small, before being finally restored to reaction level, turning to the acid characteristic test that becomes sticky terminates.
The real time measure is carried out by viscosity of the in-line viscometer 3 to self-diverting acid, obtains the viscosity of self-diverting acid at any time
Change curve, acquisition becomes sticky period and ultimate viscosity number.
Every one section of preset time, sample is taken out from the sample tap of reaction kettle 1, by potentiometric titrimeter 4 to sample
Acid concentration is measured, and draws acid concentration versus time curve, dense in acid according to the period that becomes sticky corresponding time range
It spends in versus time curve and obtains the range that becomes sticky of self-diverting acid.
Self-diverting acid provided in an embodiment of the present invention becomes sticky characteristic measurement system, is self-diverting acid and rock by reaction kettle 1
The heart provides reaction compartment, by the way that rabbling mechanism is arranged in reaction kettle 1, the self-diverting acid in reaction kettle 1 is made to keep scheduled angle
Speed rotation makes the viscosity of self-diverting acid measured to simulate state of the self-diverting acid in the practical flowing of carbonate reservoir
It is worth and the characteristic that becomes sticky is closer to truthful data.It is opposite with core holding unit 2 by being arranged in-line viscometer 3 on reaction kettle 1
Side, and protrude into the detection head of in-line viscometer 3 in the inner cavity of reaction kettle 1, with to after sufficiently being reacted with rock core from
It turns to sour viscosity to be measured, improves the reliability of measurement result.By in-line viscometer 3 and potentiometric titrimeter 4 respectively to certainly
The viscosity and acid concentration for turning to acid carry out real-time monitoring, and respectively obtain self-diverting acid viscosity and acid concentration changes with time song
Line, in order to which operator understands the process that becomes sticky of self-diverting acid, when making according to the period that becomes sticky of change curve acquisition with this
Between in section self-diverting acid acid concentration range it is more accurate.As it can be seen that self-diverting acid provided in an embodiment of the present invention becomes sticky, characteristic is surveyed
Determine system, dynamic measurement can be carried out to the characteristic that becomes sticky of self-diverting acid, and measurement result is accurate, it is easy to use, it is suitable for scale
Change and promotes and applies.
It is understood that there are many kinds of the mechanism that self-diverting acid control acid solution turns to, and it is provided in an embodiment of the present invention
Self-diverting acid becomes sticky characteristic measurement system, suitable for adjusting the self-diverting acid of acid solution flow direction by system viscosity, i.e., from
After steering acid is reacted with carbonate reservoir, steering agent molecule therein forms vermiculate glues, eventually forms reticular structure, from
And block hole biggish in carbonate reservoir, flowing to acid solution, hole is less, the lower reservoir of permeability, realizes acid solution
The acidification transformation of carbonate reservoir is completed in the transformation of flow direction.Wherein, viscoelastic surfactant self-diverting acid is exactly logical
Cross the variation adjust automatically acid solution flow direction of system viscosity, and it has that slow, leak-off rate is low, small etc. to formation damage
Advantage, thus be concerned.Therefore, self-diverting acid provided in an embodiment of the present invention becomes sticky characteristic measurement system, especially suitable for
Viscoelastic surfactant self-diverting acid becomes sticky the measurement of characteristic.
Specifically, it is provided with rabbling mechanism in reaction kettle 1, rotates self-diverting acid with desired speed by rabbling mechanism,
Mobility status of the self-diverting acid in carbonate reservoir is simulated, reacts self-diverting acid in a dynamic condition with rock core,
It becomes sticky the accuracy of characteristic measurement to improve self-diverting acid.Rabbling mechanism can be blender etc., by rotating on blender
The rotation of blade makes the self-diverting acid in reaction kettle 1 keep rotation status with desired speed.On the side wall of reaction kettle 1, preferably
The bottom of reaction kettle 1, is provided with inlet and sample tap, in order to the injection and sampling of self-diverting acid.
In order to simulate the temperature on stratum when self-diverting acid is reacted with carbonate reservoir, self-diverting acid becomes sticky characteristic measurement system
System further includes still preheater 5, is heated by heating system to still preheater 5, the self-diverting acid in still preheater 5 is made to reach to be rebuilt
The temperature of carbonate reservoir makes certainly to avoid the influence generated by reaction temperature difference to self-diverting acid viscosity change
The measurement for turning to sour viscosity characteristics is more accurate.Specifically, heating system can be heat-conducting oil furnace, electric heater etc..In still preheater 5
After self-diverting acid is heated to predetermined temperature, reaction kettle 1 is entered by transfer line, it is anti-to be carried out in a dynamic condition with rock core
It answers.
When self-diverting acid is reacted with rock core, in-line viscometer 3 is used to carry out the viscosity of self-diverting acid in reaction kettle 1
The real time measure, in order to understand the change procedure of self-diverting acid viscosity.The detector portion of in-line viscometer 3 is located under rabbling mechanism
At square 2-3cm, to reserve sufficient space for the rotating vane of rabbling mechanism, the data for measuring in-line viscometer 3 are more quasi-
It is really reliable.
In-line viscometer 3 is also electrically connected to data collection system 6, can be to self-diverting acid by data collection system 6
Viscosity data is collected, records and analysis processing.Data collection system 6 may be mounted in terminal device, such as be mounted on
In computer, in order to which acquisition parameter of the operator to data is adjusted.Data collection system 6 can be combined with low damage
The numerical value such as temperature, revolving speed of acid, analyze the viscosity change of self-diverting acid, and draw the viscosity of self-diverting acid at any time,
The curve of the variations such as temperature obtains the characteristic information that becomes sticky of more related self-diverting acid convenient for operator.
Rock core is fixed on the side of reaction kettle 1 by core holding unit 2, and specifically, core holding unit 2 is in one end open
The closed tubular of the other end, one end of rock core are fixed in the inner cavity of core holding unit 2, and the other end is concordant with 1 wall surface of reaction kettle,
To come into full contact with and be reacted with the self-diverting acid in reaction kettle 1.
In order to simulate hyperbaric environment when self-diverting acid is reacted with carbonate reservoir, reaction kettle 1 is interior added with 6-
The pressure of 8MPa, preferably 7MPa let out after reacting in order to avoid self-diverting acid with rock core from the side of rock core, rock core folder
Pipeline is vertical connect for the load of the outer wall of holder 2 and a plurality of confining pressure, and confining pressure load pipeline is connected to confining pressure loading system 7.Specifically,
The pressurization hole of multiple vertical outwardly convexs is provided on the outer wall of core holding unit 2, each pressurization hole adds with a confining pressure respectively
Contained pipeline connection.Confining pressure loading system 7 is pressure-loaded system, and confining pressure load pipeline is connected to pressure-loaded system.Pass through
Confining pressure loading system 7 applies confining pressure to the rock core in core holding unit 2, to avoid self-diverting acid side leakage around rock core, protects
Card self-diverting acid is sufficiently reacted with rock core.
Potentiometric titrimeter 4 is for testing the acid concentration of self-diverting acid in reaction kettle 1, when measuring acid concentration, needs
Self-diverting acid sample is taken out from the sample tap of reaction kettle 1 by operator, titration test is then carried out again, obtains self-diverting acid
Concentration.
Second aspect carries out self-diverting acid using above system and becomes sticky characteristic measurement the embodiment of the invention provides a kind of
Method, this method comprises:
Rock core is obtained, rock core is put into core holding unit 2.
The self-diverting acid of predetermined amount is injected into reaction kettle 1 through inlet, the low damage in reaction kettle 1 is made by rabbling mechanism
Acid is rotated with desired speed, and self-diverting acid is made to react with rock core.
The real time measure is carried out by viscosity of the in-line viscometer 3 to self-diverting acid, obtains the viscosity of self-diverting acid at any time
Change curve, acquisition becomes sticky period and ultimate viscosity number.
Every one section of preset time, sample is taken out from the sample tap of reaction kettle 1, by potentiometric titrimeter 4 to sample
Acid concentration is measured, and draws acid concentration versus time curve, dense in acid according to the period that becomes sticky corresponding time range
It spends in versus time curve and obtains the range that becomes sticky of self-diverting acid.
Wherein, the characteristic that becomes sticky of self-diverting acid refers to the period that becomes sticky, ultimate viscosity number and the range that becomes sticky of self-diverting acid.
Carry out self-diverting acid become sticky characteristic measurement when, it is necessary first to obtain the rock core of predetermined size, the size of rock core should be with
The interior chamber size of core holding unit 2 is adapted.In general, the diameter of rock core is 50-51mm, preferably 50.8mm, and length is
30-100mm.In order to avoid rock core is from the inner cavity for falling into reaction kettle 1 in the side wall of reaction kettle 1, as shown in Fig. 2, rock core
Front end is provided with the recessed step of a circle, is provided with the raised step matched with the recessed step on the side wall of reaction kettle 1, from
And on the basis of the inner wall of guarantee reaction kettle 1 is concordant with rock core front end, it avoids rock core from sliding, guarantees in rock core and reaction kettle 1
The effecting reaction of acid solution.
In order to be capable of fixing rock core in the inner cavity of core holding unit 2, the shaking of rock core is avoided, rock core is put into rock core
Clamper 2 includes: that packing element is sleeved on outside rock core, is then placed in the inner cavity of core holding unit 2, and applies 5- to rock core
The confining pressure of 8MPa.Packing element is located between 2 inner cavity of rock core and core holding unit, for further fixing the position of rock core.Work as rock
When the length of the heart is shorter, it is also necessary to be packed into cushion block in the rear end of rock core, fill the sky in 2 inner cavity of core holding unit by cushion block
Between, rock core is headed into the one end being connected with reaction kettle 1 from the outer end of core holding unit 1, keeps rock core end face and 1 wall surface of reaction kettle flat
Together, so that rock core is sufficiently reacted with self-diverting acid.In addition, in order to avoid the side leakage of self-diverting acid, it is also necessary to be loaded by confining pressure
System 7 applies the confining pressure of 5-8MPa to rock core.
When self-diverting acid is reacted with rock core, need to keep the pressure of 4-7MPa in reaction kettle 1, to self-diverting acid and carbonic acid
Hyperbaric environment when rock salt reservoir is reacted is simulated.
Then, the self-diverting acid of predetermined amount, predetermined temperature is injected into reaction kettle 1 through inlet, is made instead by rabbling mechanism
It answers the self-diverting acid in kettle 1 to rotate with desired speed, self-diverting acid is made to react with rock core.Wherein, desired speed is by such as
Lower method is calculated:
Obtain the operational discharge capacity and mean flow rate, self-diverting acid that self-diverting acid when acidification is transformed is carried out to carbonate reservoir
Initial viscosity and initial density, rabbling mechanism in the radius of rotating vane, the average slit width of default acid-etched fracture and average seam
Height calculates Reynolds number of the self-diverting acid in carbonate reservoir by formula a and formula b.
Wherein, Q is operational discharge capacity, m3/min；For mean flow rate, m/s；High, the m for average seam；For average seam
Width, cm；ρ is initial density, g/cm3；μ is initial viscosity, MPas；ReFor Reynolds number.
According to the similar principle of the identical fluid motion state of Reynolds number, self-diverting acid is flowed in carbonate reservoir
Reynolds number numerical value of Reynolds number numerical value when being rotated in reaction kettle 1 as self-diverting acid, to pass through self-diverting acid in reaction kettle 1
Rotation simulation its state when being flowed in carbonate reservoir, to make the measurement result of self-diverting acid viscosity characteristics more
Accurately.
According to the above-mentioned Reynolds number R being calculatede, by formula c and formula d, desired speed is calculated.
ω R=2 π nR formula d
Wherein, ω is angular speed, s-1；R is the radius of rotating vane, cm；N is desired speed, r/min.
Angular speed when self-diverting acid rotation is first calculated by formula c, then is converted into angular speed by formula d
Speed, in order to the setting of rabbling mechanism revolving speed.
During self-diverting acid is reacted with rock core, carried out by viscosity of the in-line viscometer 3 to self-diverting acid
The real time measure obtains the viscosity versus time curve of self-diverting acid, obtains become sticky period and ultimate viscosity number.
Wherein, obtaining the period that becomes sticky includes: according to slope, successively by the viscosity versus time curve of self-diverting acid
It is divided into the initial stage, viscosity increases the stage, viscosity reduces stage and later stage.
Make the tangent line in each stage, the intersection point that the tangent line and viscosity of initial stage increase the tangent line in stage is to become sticky the period
At the beginning of point, it is the end time of period of becoming sticky that viscosity, which reduces the tangent line in stage and the intersection point of the tangent line of later stage,
Point.
Period between sart point in time and end time point is to become sticky the period.
It is understood that the period that becomes sticky refers to the viscosity of self-diverting acid period jumpy and low damage
Acid plays plugging action, and acid solution can be made to change the period of flow direction.As shown in attached drawing 3 and attached drawing 4, with the reaction time
Extension, the viscosity of self-diverting acid is presented the trend of first increases and then decreases, can be divided into four according to slope of a curve in figure
Part is followed successively by the initial stage from left to right, viscosity increases the stage, viscosity reduces stage and later stage.Do each stage
Tangent line, the intersection point A that the tangent line and viscosity of initial stage increase the tangent line in stage is point at the beginning of becoming sticky the period, from A point
Start, the viscosity of self-diverting acid is sharply increased, reduced rapidly after reaching ultimate viscosity number.Viscosity reduces tangent line and the later period in stage
The intersection points B of the tangent line in stage is the end time point of period of becoming sticky, and since B point, the viscosity decrease speed of self-diverting acid becomes
Slow, i.e. self-diverting acid performance terminates the period of acid solution steering-effecting.The A point corresponding time is 83min, when B point is corresponding
Between be 169min, therefore, self-diverting acid become sticky the period be 83-169min.Within the period that becomes sticky, the viscosity of self-diverting acid
It is worth larger, there is stronger shut-off capacity to the hole in carbonate reservoir, can cause the steering of acid solution, realize low damage
Acid carries out the purpose of acidification transformation to the region of carbonate reservoir middle-low permeability.
During self-diverting acid is reacted with rock core, every one section of preset time, it is also necessary to pass through constant-current titration
Instrument 4 is measured the acid concentration of self-diverting acid.Wherein, preset time 0.5-3min.Rule of thumb, self-diverting acid and rock core
Reaction early period, the acid concentration pace of change of self-diverting acid is very fast, and preset time should be shorter, for example, 0.5min, 1min etc., with
The time interval for shortening measurement, fully understands the changing rule of self-diverting acid acid concentration.Self-diverting acid reacts the later period with rock core,
The acid concentration pace of change of self-diverting acid is slower, and preset time, for example, 2min, 3min etc. can be appropriately extended, and is surveyed with extending
Fixed time interval mitigates the labor burden of operator.
Then, according to the data of the self-diverting acid acid concentration of measurement, acid concentration versus time curve is drawn, according to change
Viscous period corresponding time interval obtains self-diverting acid within the period that becomes sticky in acid concentration versus time curve
Acid concentration range, that is, become sticky range.For example, 4 can determine that the period that becomes sticky of self-diverting acid is 83-169min with reference to the accompanying drawings,
Then attached drawing 5 is observed, wherein in the 83-169min period, the correspondence numerical value of acid concentration is 10.4%-14.2%, therefore, rotation
It is 10.4%-14.2% to the range that becomes sticky of acid.
It will be described in detail below by specific embodiment, in following specific embodiments, related operation is not infused
Bright condition person, according to normal conditions or manufacturer suggest condition carry out.It is raw materials used that production firm and specification is not specified
Person is can be with conventional products that are commercially available:
Embodiment 1
It present embodiments provides a kind of self-diverting acid to become sticky characteristic measurement system, as shown in Fig. 1, which includes: to set
It is equipped with the reaction kettle 1 of rabbling mechanism, the bottom of reaction kettle 1 is provided with inlet and sample tap.
The side of reaction kettle 1 is arranged in core holding unit 2, for fixing rock core, makes acid in rock core end face and reaction kettle 1
Liquid contact.Confining pressure load pipeline is provided on the side wall of core holding unit 2, confining pressure load pipeline is connected to confining pressure loading system 7.
In-line viscometer 3 is arranged in the other side of reaction kettle 1, and is electrically connected with data collection system 6.In-line viscometer 3
Detection head protrude into the inner cavity of reaction kettle 1.
Potentiometric titrimeter 4, for measuring the acid concentration of self-diverting acid in reaction kettle 1.
Still preheater 5 is connected to the inlet of reaction kettle 1 by transfer line.
Embodiment 2
For certain carbonate reservoir, a kind of system progress self-diverting acid using in embodiment 1 is present embodiments provided
Become sticky the method for characteristic measurement.
Wherein, self-diverting acid selects the star new technology development of Guanghan China to study viscoelastic surfactant low damage produced
Acid.The operational discharge capacity of self-diverting acid is 5m when carrying out acidification transformation to carbonate reservoir3/ min, the initial viscosity of self-diverting acid
For 51MPas, initial density 1.1g/cm3, in rabbling mechanism the radius of rotating vane be 1.25cm, default acid-etched fracture
Average slit width is 0.005m, averagely stitches a height of 25m.
The method being measured to the characteristic that becomes sticky of self-diverting acid includes:
The cylindrical body testing rock core that diameter is 50.8mm, length is 100mm is laterally drilled through on the carbonate rock rock core of underground,
Both ends end face polishes, and the shape of rock core is as shown in Fig. 2.Packing element is sleeved on outside rock core, testing rock core is pressed into scheduled side
To after being packed into clamper, clamper interface is screwed, rear end is filled and fixed with polytetrafluoro cushion block.It is right by confining pressure loading system 7
The confining pressure of rock core application 5Mpa.
Self-diverting acid is heated to 120 DEG C by still preheater 5, then by 900ml, 120 DEG C of self-diverting acid through inlet
Reaction kettle 1 is injected, the self-diverting acid in reaction kettle 1 is rotated with the desired speed of 203r/min by rabbling mechanism, makes rotation
It reacts to acid with rock core.
Wherein, the calculating process of desired speed are as follows:
It is calculated according to formula a,
It is calculated according to formula b,
By Re=71.9 substitute into formula c, are calculated,
It is calculated according to formula d,
Every 10s once measures the viscosity of self-diverting acid by in-line viscometer 3, obtain the viscosity of self-diverting acid with
The change curve of time obtains become sticky period and ultimate viscosity number.As shown in attached drawing 3 and attached drawing 4, the period that becomes sticky is 83-
169min, time corresponding to ultimate viscosity number are 128min.
In the initial reaction stage of self-diverting acid and rock core, every 30s takes out sample from the sample tap of reaction kettle 1, passes through current potential
Titrator 4 is measured the acid concentration of sample, and in reacting the later period for self-diverting acid and rock core, sampling interval time is (i.e. default
Time) it is 3min.Acid concentration versus time curve is drawn, according to the period that becomes sticky corresponding time range, in acid concentration
The range that becomes sticky of self-diverting acid is obtained in versus time curve.As shown in Fig. 5, the range that becomes sticky of self-diverting acid is
9.2%-14.2%.
The foregoing is merely presently preferred embodiments of the present invention, the protection scope being not intended to limit the invention, all in this hair
Within bright spirit and principle, any modification, equivalent replacement, improvement and so on should be included in protection scope of the present invention
Within.
Claims (10)
- The characteristic measurement system 1. a kind of self-diverting acid becomes sticky, which is characterized in that the system comprises:It is provided with the reaction kettle (1) of rabbling mechanism, is provided with inlet and sample tap on the side wall of the reaction kettle (1)；Core holding unit (2), be arranged in the side of the reaction kettle (1), for fixing rock core, and make rock core end face with it is described Acid solution contact in reaction kettle (1)；Side opposite with the core holding unit (2) on the reaction kettle (1) is arranged in in-line viscometer (3), described online The inner cavity of the reaction kettle (1) is protruded on the detection head of viscosimeter (3)；Potentiometric titrimeter (4), for measuring the acid concentration of self-diverting acid in the reaction kettle (1).
- 2. system according to claim 1, which is characterized in that the system also includes still preheater (5), the still preheaters (5) it is connected to the inlet of the reaction kettle (1) by transfer line.
- 3. system according to claim 1, which is characterized in that the detector portion of the in-line viscometer (3) is located at described Below rabbling mechanism at 2-3cm；The in-line viscometer (3) is electrically connected to data collection system (6).
- 4. system according to claim 1, which is characterized in that the outer wall of the core holding unit (2) adds with a plurality of confining pressure Contained pipeline vertically connects, and the confining pressure load pipeline is connected to confining pressure loading system (7).
- 5. being become sticky the method for characteristic using system measurement self-diverting acid described in claim 1, which is characterized in that the method packet It includes:Rock core is obtained, the rock core is put into core holding unit (2)；The self-diverting acid of predetermined amount, predetermined temperature is injected into reaction kettle (1) through inlet, the reaction kettle is made by rabbling mechanism (1) self-diverting acid in is rotated with desired speed, and the self-diverting acid is made to react with the rock core；The real time measure is carried out by viscosity of the in-line viscometer (3) to the self-diverting acid, obtains the viscosity of the self-diverting acid Versus time curve obtains become sticky period and ultimate viscosity number；Every preset time, sample is taken out from the sample tap of the reaction kettle (1), by potentiometric titrimeter (4) to the sample The acid concentration of product is measured, and draws the acid concentration versus time curve, according to the period that becomes sticky it is corresponding when Between section, obtained in the acid concentration versus time curve self-diverting acid it is described become sticky in the period acid it is dense Spend range.
- 6. according to the method described in claim 5, it is characterized in that, described rock core is put into core holding unit (2) includes: by glue Cylinder is sleeved on outside the rock core, is then placed in the inner cavity of the core holding unit (2), and applies 5-8MPa to the rock core Confining pressure.
- 7. according to the method described in claim 5, it is characterized in that, the pressure in the reaction kettle (1) is 4-7MPa.
- 8. according to the method described in claim 5, it is characterized in that, the desired speed is calculated by the following method:Obtain the operational discharge capacity of self-diverting acid when carrying out acidification transformation to carbonate reservoir, the initial viscosity of self-diverting acid and just The radius of rotating vane, the average slit width of default acid-etched fracture and average seam are high in beginning density, the rabbling mechanism, pass through formula A and formula b calculates Reynolds number of the self-diverting acid in the carbonate reservoir；Wherein, Q is operational discharge capacity, m3/min；For mean flow rate, m/s；High, the m for average seam；For average slit width, cm；ρ For initial density, g/cm3；μ is initial viscosity, MPas；ReFor Reynolds number；The Reynolds number numerical value that the self-diverting acid is flowed in the carbonate reservoir is as the self-diverting acid described The desired speed is calculated by formula c and formula d in Reynolds number numerical value in reaction kettle (1) when rotation；ω R=2 π nR formula dWherein, ω is angular speed, s-1；R is the radius of rotating vane, cm；N is desired speed, r/min.
- 9. according to the method described in claim 5, the period includes: it is characterized in that, the acquisition becomes stickyAccording to slope, the viscosity versus time curve of the self-diverting acid is in turn divided into the initial stage, viscosity increases Stage, viscosity reduce stage and later stage；Make the tangent line in each stage, the intersection point that the tangent line of the initial stage and the viscosity increase the tangent line in stage is the change Point at the beginning of the viscous period, it is the change that the viscosity, which reduces the tangent line in stage and the intersection point of the tangent line of the later stage, The end time point of viscous period；Period between the sart point in time and end time point is described becomes sticky the period.
- 10. according to the method described in claim 5, it is characterized in that, the preset time is 0.5-3min.
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