CN107664675A - Based on thickening type emulsification surfactants washing oil rate analysis method - Google Patents
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Abstract
The present invention provides a kind of washing oil rate analysis method based on thickening type emulsification surfactants, including：Step 1, aging oil-sand and surfactant solution are made；Step 2, a certain amount of aging oil-sand and surfactant solution are weighed, determines the oil mass that surfactant solution washes out；Step 3, blank assay is done with distilled water, determines the oil mass that distilled water washes out；Step 4, a certain amount of crude oil and surfactant solution are weighed, it is determined that total oil mass；Step 5, the washing oil rate of the oil mass, the oil mass that distilled water washes out and the total oil mass calculating surfactant that are washed out according to surfactant solution.The present invention can intuitively, fast and accurately evaluate eluting power of the surfactant to oil-sand surface adhesion oil, evaluated suitable for the stronger surfactant properties of emulsifying capacity, screening and assessment for emulsification surfactants oil displacement system provides technical support, and it is significant further to improve recovery ratio to more than 95 DEG C ultrahigh-temperature oil reservoirs.
Description
Technical field
The present invention relates to oilfield exploitation technical field, especially relates to one kind and is washed based on thickening type emulsification surfactants
Oil cut rate analysis method.
Background technology
More than 95 DEG C ultrahigh-temperature petroleum resources are big, and such oil reservoir enters High water cut successively at present, high recovery percent of reserves is developed
Stage, conventional water drive be difficult it is further improve recovery ratio, and the molecular structure of polyacrylamide oil displacement agent determine it is conventional
Polymer displacement of reservoir oil tech is difficult in adapt to more than 95 DEG C of ultrahigh-temperature reservoir condition, and existing oil displacement system can not meet ultrahigh-temperature oil reservoir
Increase substantially the needs of recovery ratio, it would be highly desirable to establish the chemical displacement of reservoir oil technology suitable for ultrahigh-temperature oil reservoir.
Emulsification surfactants technology of reservoir sweep is a kind of brand-new chemical displacement of reservoir oil method, and emulsion system relies on its special thing
Physicochemical performance, by the synergistic function between surfactant, assign oil displacement system heatproof, salt resistance, emulsification thickening, height
The displacement of reservoir oil, the easily characteristic such as injection are imitated, suitable for V class ultrahigh-temperature oil reservoir, further improving oil recovery factor for such oil reservoir has
Significance.
Emulsion-surfactant (E-S) oil displacement system is made up of self-emulsifying surfactant and low-tension surfactant,
The main function of wherein self-emulsifying surfactant is to promote water-oil phase spontaneous emulsification under reservoir conditions, is formed highly viscous
Water-oil emulsion, preferentially enter high permeability zone and block, so as to low-permeability layer position in starting, expand swept volume；Low-tension surface
The main function of activating agent is to reduce oil water interfacial tension, improves oil displacement efficiency.Self-emulsifying surfactant enters head behind stratum
It is secondary to promote water-oil phase to form highly viscous water-oil emulsion, enter by highly viscous emulsion caused in pore constriction
The effect such as squeeze, draw, dragging, effectively driveing the residual oil for being distributed in edge and corner position, while aid in low-tension surfactant
Oil displacement efficiency is improved by emulsifying entrainment effect and strong wash oil character.
It is the emulsification surfactants in ground injection low viscosity that emulsification surfactants, which improve recovery efficiency technique, in oil reservoir
In promote water-oil phase to form high viscosity WO emulsion to expand swept volume, while carried using low-tension surfactant
High oil displacement efficiency.It is mainly characterized by oil phase solubilising aqueous phase and forms water-in-oil emulsion, emulsion phase viscosity compared with crude oil increase, emulsification shape
State is unstable (quick emulsification, fast emulsion breaking).Promote in oil reservoir water-oil phase formed water-in-oil emulsion shape premise be exactly
It is required that the eluting power that the emulsification surfactants in emulsification surfactants oil displacement system have had to oil-sand surface adhesion oil,
Eluting power of the surfactant to oil-sand surface adhesion oil generally is characterized with washing oil rate, is analyzed for conventional washing oil rate at present
Method, the emulsifiability of surfactant can result in oil-water emulsion layer during petroleum ether extraction washes out crude oil, and
And be difficult to eliminate, so as to disturb extraction results, prevent spectrophotometer from accurately detecting.In order to quickly and accurately characterize emulsion
The wash oil character of surfactant is, it is necessary to establish a kind of washing oil rate analysis method based on thickening type emulsion.
The content of the invention
It is an object of the invention to provide a kind of emulsification surfactants displacement of reservoir oil for being applied to more than 95 DEG C ultrahigh-temperature oil reservoirs,
Surfactant being lived based on thickening type emulsion surface to the oily eluting power of oil-sand surface adhesion can more accurately be evaluated
Property agent washing oil rate analysis method,
The purpose of the present invention is achieved through the following technical solutions：Washing oil rate analysis based on thickening type emulsification surfactants
Method, being somebody's turn to do the washing oil rate analysis method based on thickening type emulsification surfactants includes：Step 1, aging oil-sand and surface are made
Activator solution；Step 2, a certain amount of aging oil-sand and surfactant solution are weighed, determines that surfactant solution washes out
Oil mass；Step 3, blank assay is done with distilled water, determines the oil mass that distilled water washes out；Step 4, weigh a certain amount of crude oil and
Surfactant solution, it is determined that total oil mass；Step 5, oil mass, the oil mass of distilled water wash-off washed out according to surfactant solution
The washing oil rate of surfactant is calculated with total oil mass.
The purpose of the present invention is also achieved through the following technical solutions：
Step 1 includes：
(a), take channel sand, target block scene injection water and crude oil sample standby；
(b) target block crude oil and channel sand uniformly, are mixed and made into oil-sand by a certain percentage, are put into glass sample bottle
After closed, certain time is placed in insulating box, aging is carried out to oil-sand；
(c), surfactant is added to scene injection water according to a certain percentage, the obtained surfactant that stirs is molten
Liquid.
In step (b), the mass ratio of crude oil and channel sand is 1:5~1:3, the temperature of insulating box is more than 70 DEG C,
Standing time in insulating box is 7~14 days；In step (c), the content of surfactant is in surfactant solution
(0.1~2.0) %.
Step 2 includes：A certain amount of aging oil-sand is weighed in outer grinding port conical flask, is connected with interior ground graded tube
Afterwards, a certain amount of surfactant solution is added according to a certain percentage；After interior ground graded tube upper port sealing, in insulating box
After placing certain time, the oil mass that surfactant solution washes out is read in interior ground graded tube.
In step 2, the mass ratio of the gross mass of aging oil-sand and surfactant solution and aging oil-sand is 50:1, always
Carburetion chiltern amount is (2.0~3.0) g, and the quality of surfactant solution is
(98.0~147.0) g；The temperature of insulating box is more than 70 DEG C, standing time in insulating box for 48 hours with
On.
Step 4 includes：A certain amount of crude oil is weighed in outer grinding port conical flask, after being connected with interior ground graded tube, is added
Enter a certain amount of surfactant solution；After interior ground graded tube upper port sealing, after placing certain time in insulating box,
Total oil mass is read in interior ground graded tube.
In step 4, the temperature of insulating box is more than 70 DEG C, and the standing time in insulating box is more than 48 hours.
In step 4, the crude quality weighed is the Theoretical Mass that contained crude oil in aging oil-sand is weighed in step 2, according to
It is said that take the mass ratio of ageing oil chiltern amount and crude oil and channel sand to be calculated, the quality and step of the surfactant weighed
It is identical in 2.
In steps of 5, the formula of the washing oil rate of gauging surface activating agent is：
In formula：η1--- surfactant washing oil rate, %；
V0--- total oil mass, mL contained by oil-sand；
V1--- distilled water washes out oil mass, mL；
V2--- surfactant solution washes out oil mass, mL.
In steps of 5, the ratio of distilled water washes out oil mass and total oil mass should be less than 5%.
The present invention based on thickening type emulsification surfactants washing oil rate analysis method, especially suitable for emulsion surface-active
Evaluation of the surfactant to the washing oil ability of oil-sand in agent oil displacement system, it is quick to determine device using the washing oil rate of designed, designed
Surfactant is evaluated in emulsification surfactants oil displacement system to the washing oil ability of oil-sand, for it is directly perceived, fast and accurately comment
Valency emulsification surfactants are to the oily eluting power of oil-sand surface adhesion, and testing procedure is simple, cost is low, effect is good, for breast
The screening and assessment of liquid displacing surfactant system provides technical support.
Brief description of the drawings
Fig. 1 is the stream of the specific embodiment based on thickening type emulsification surfactants washing oil rate analysis method of the present invention
Cheng Tu；
Fig. 2 is that washing oil rate of the present invention determines schematic device.
Embodiment
For enable the present invention above and other objects, features and advantages become apparent, it is cited below particularly go out preferable implementation
Example, and coordinate shown in accompanying drawing, it is described in detail below.
As shown in figure 1, Fig. 1 is that one based on thickening type emulsification surfactants washing oil rate analysis method of the invention is specific
The flow chart of embodiment.
In step 101, aging oil-sand and surfactant solution are made.Concretely comprise the following steps：Take channel sand, target block existing
Field injection water and crude oil sample are standby；Target block crude oil and channel sand are uniformly mixed and made into oil-sand by a certain percentage, are put into
In glass sample bottle it is closed after, certain time is placed in insulating box, to oil-sand carry out aging, in one embodiment, crude oil with
The mass ratio of channel sand is 1:5~1:3, the temperature of insulating box is more than 70 DEG C, and the standing time in insulating box is (7~14)
My god；Surfactant is added to scene injection water according to a certain percentage, stir obtained surfactant solution, surface-active
The content of surfactant is (0.1~2.0) % in agent solution.
In step 102, a certain amount of aging oil-sand and surfactant solution are weighed, determines that surfactant solution washes out
Oil mass.In one embodiment, as shown in Fig. 2 determining schematic device, outer grinding port cone for the washing oil rate of designed, designed of the present invention
The capacity of shape bottle 2 is 100mL, and the total capacity after being assembled with interior ground graded tube 1 is 160mL.Claim in outer grinding port conical flask 2
A certain amount of aging oil-sand is taken, after being connected with interior ground graded tube 1, adds a certain amount of surfactant according to a certain percentage
The gross mass of solution, aging oil-sand and surfactant solution is 50 with the mass ratio of aging oil-sand:1, general ageing oil chiltern
Measure as (2.0~3.0) g, the quality of surfactant solution is (98.0~147.0) g；The interior upper port of ground graded tube 1 sealing
Afterwards, after placing certain time in insulating box, the oil mass that surfactant solution washes out is read in interior ground graded tube 1, it is permanent
The temperature of incubator is more than 70 DEG C, and the standing time in insulating box is more than 48 hours.
In step 103, blank assay is done with distilled water, the oil mass that distilled water washes out is read in interior ground graded tube.
In step 104, a certain amount of crude oil and surfactant solution are weighed, it is determined that total oil mass.In one embodiment, exist
A certain amount of crude oil is weighed in outer grinding port conical flask 2, after being connected with interior ground graded tube, adds a certain amount of surfactant
Solution, crude quality are the Theoretical Mass that contained crude oil in aging oil-sand is weighed in step 102, and foundation weighs ageing oil chiltern amount
It is calculated with the mass ratio of crude oil and channel sand, the quality for adding surfactant is identical with step 102；Interior ground scale
After the sealing of the upper port of pipe 1, after placing certain time in insulating box, total oil mass is read in interior ground graded tube 1, insulating box
Temperature is more than 70 DEG C, and the standing time in insulating box is more than 48 hours.
The oil mass washed out in step 105, the oil mass washed out according to surfactant solution, distilled water and total oil mass computational chart
The washing oil rate of face activating agent, washing oil rate is calculated by formula (1).
In formula：η1--- surfactant washing oil rate, %；
V0--- total oil mass, mL contained by oil-sand；
V1--- distilled water washes out oil mass, mL；
V2--- surfactant solution washes out oil mass, mL.
In one embodiment, the ratio of distilled water washes out oil mass and total oil mass should be less than 5%.
In the specific embodiment of the application present invention, include following steps：
(a) take channel sand, target block scene injection water and crude oil sample standby.
(b) target block crude oil and channel sand are uniformly mixed and made into oil-sand by a certain percentage, are put into glass sample bottle
After closed, certain time is placed in insulating box, aging is carried out to oil-sand.The mass ratio of crude oil and channel sand is 1:4.Insulating box
Temperature be 80 DEG C, the standing time in insulating box is (7~14) day.
(c) surfactant is added to scene injection water according to a certain percentage, stir obtained surfactant solution；
The content of surfactant is 2.0% in surfactant solution.
(d) a certain amount of aging oil-sand is weighed in outer grinding port conical flask, after being connected with interior ground graded tube, according to one
Certainty ratio adds a certain amount of surfactant solution；The gross mass of aging oil-sand and surfactant solution and aging oil-sand
Mass ratio is 50:1, general ageing oil chiltern amount is (2.0~3.0) g, the quality of surfactant solution for (98.0~
147.0)g。
(e) in after the sealing of ground graded tube upper port, after placing certain time in insulating box, in interior ground graded tube
Read the oil mass that surfactant solution washes out；The temperature of insulating box is 80 DEG C, and the standing time in insulating box is 48 hours.
(f) blank assay is done with distilled water, the oil mass that distilled water washes out is read in interior ground graded tube.
(g) a certain amount of crude oil is weighed in outer grinding port conical flask, adds a certain amount of surfactant solution；Crude oil matter
Measure to weigh in aging oil-sand contained theoretical crude quality in (d), that is, weigh multiplying for ageing oil chiltern amount and oil-sand mass ratio
Product, the quality for adding surfactant are identical with (d).
(h) in after the sealing of ground graded tube upper port, after placing certain time in insulating box, in interior ground graded tube
Read total oil mass；The temperature of insulating box is 80 DEG C, and the standing time in insulating box is 48 hours.
(i) oil mass, the oil mass of distilled water wash-off and the total oil mass washed out according to surfactant solution calculates surface-active
The washing oil rate of agent, washing oil rate is calculated by formula (1).
In formula：η1--- surfactant washing oil rate, %；
V0--- total oil mass, mL contained by oil-sand；
V1--- distilled water washes out oil mass, mL；
V2--- surfactant solution washes out oil mass, mL.
The ratio of the oil mass that distilled water washes out and total oil mass should be less than 5%.The result such as following table institute measured by the above method
Show：
The surfactant washing oil rate measurement result of table 1
The washing oil rate of 13-1 and 13-2 samples is higher, and preliminary screening 13-1 and 13-2 can be used as emulsification surfactants to drive
The alternative activating agent of self-emulsifying surfactant in oil systems.
The present invention based on thickening type emulsification surfactants washing oil rate analysis method, can intuitively, fast and accurately comment
For valency surfactant to the oily eluting power of oil-sand surface adhesion, this method does not need oil mass and the light splitting of petroleum ether extraction wash-off
Photometer detects, and overcomes in conventional washing oil rate analysis method surfactant emulsifies performance interference extraction results and causes point
Light photometer can not be detected accurately, evaluated suitable for the stronger surfactant properties of emulsifying capacity, be emulsification surfactants
The screening and assessment of oil displacement system provides technical support, and further improving recovery ratio to more than 95 DEG C ultrahigh-temperature oil reservoirs has important meaning
Justice.
It is described above, be only presently preferred embodiments of the present invention, any formal limitation not done to the present invention, it is every according to
According to the technical spirit of the present invention, any simple modification made to above example, equivalent variations, the protection of the present invention is each fallen within
Within the scope of.
Claims (10)
1. the washing oil rate analysis method based on thickening type emulsification surfactants, it is characterised in that thickening type emulsion table should be based on
The washing oil rate analysis method of face activating agent includes：
Step 1, aging oil-sand and surfactant solution are made；
Step 2, a certain amount of aging oil-sand and surfactant solution are weighed, determines the oil mass that surfactant solution washes out；
Step 3, blank assay is done with distilled water, determines the oil mass that distilled water washes out；
Step 4, a certain amount of crude oil and surfactant solution are weighed, it is determined that total oil mass；
Step 5, oil mass, the oil mass of distilled water wash-off and the total oil mass washed out according to surfactant solution calculates surfactant
Washing oil rate.
2. the washing oil rate analysis method according to claim 1 based on thickening type emulsification surfactants, it is characterised in that
Step 1 includes：
(a), take channel sand, target block scene injection water and crude oil sample standby；
(b) target block crude oil and channel sand uniformly, are mixed and made into oil-sand by a certain percentage, are put into closed in glass sample bottle
Afterwards, certain time is placed in insulating box, aging is carried out to oil-sand；
(c), surfactant is added to scene injection water according to a certain percentage, stir obtained surfactant solution.
3. the washing oil rate analysis method according to claim 2 based on thickening type emulsification surfactants, it is characterised in that
In step (b), the mass ratio of crude oil and channel sand is 1:5~1:3, the temperature of insulating box is more than 70 DEG C, in insulating box
Standing time be 7~14 days；In step (c), in surfactant solution the content of surfactant for (0.1~
2.0) %.
4. the washing oil rate analysis method according to claim 1 based on thickening type emulsification surfactants, it is characterised in that
Step 2 includes：A certain amount of aging oil-sand is weighed in outer grinding port conical flask, after being connected with interior ground graded tube, according to one
Certainty ratio adds a certain amount of surfactant solution；After interior ground graded tube upper port sealing, placed in insulating box certain
After time, the oil mass that surfactant solution washes out is read in interior ground graded tube.
5. the washing oil rate analysis method according to claim 4 based on thickening type emulsification surfactants, it is characterised in that
In step 2, the mass ratio of the gross mass of aging oil-sand and surfactant solution and aging oil-sand is 50:1, ageing oil chiltern
Measure as (2.0~3.0) g, the quality of surfactant solution is (98.0~147.0) g；The temperature of insulating box is more than 70 DEG C,
Standing time in insulating box is more than 48 hours.
6. the washing oil rate analysis method according to claim 1 based on thickening type emulsification surfactants, it is characterised in that
Step 4 includes：A certain amount of crude oil is weighed in outer grinding port conical flask, after being connected with interior ground graded tube, is added a certain amount of
Surfactant solution；After interior ground graded tube upper port sealing, after placing certain time in insulating box, carved in interior ground
Total oil mass is read in degree pipe.
7. the washing oil rate analysis method according to claim 6 based on thickening type emulsification surfactants, it is characterised in that
In step 4, the temperature of insulating box is more than 70 DEG C, and the standing time in insulating box is more than 48 hours.
8. the washing oil rate analysis method according to claim 1 based on thickening type emulsification surfactants, it is characterised in that
In step 4, the crude quality weighed is the Theoretical Mass that contained crude oil in aging oil-sand is weighed in step 2, old according to weighing
The mass ratio of carburetion chiltern amount and crude oil and channel sand is calculated, and the quality of the surfactant weighed is identical with step 2.
9. the washing oil rate analysis method according to claim 1 based on thickening type emulsification surfactants, it is characterised in that
In steps of 5, the formula of the washing oil rate of gauging surface activating agent is：
<mrow>
<msub>
<mi>&eta;</mi>
<mn>1</mn>
</msub>
<mo>=</mo>
<mfrac>
<mrow>
<mo>(</mo>
<msub>
<mi>V</mi>
<mn>2</mn>
</msub>
<mo>-</mo>
<msub>
<mi>V</mi>
<mn>1</mn>
</msub>
<mo>)</mo>
</mrow>
<msub>
<mi>V</mi>
<mn>0</mn>
</msub>
</mfrac>
<mo>&times;</mo>
<mn>100</mn>
<mi>%</mi>
<mn>...</mn>
<mrow>
<mo>(</mo>
<mn>1</mn>
<mo>)</mo>
</mrow>
</mrow>
In formula：η1--- surfactant washing oil rate, %；
V0--- total oil mass, mL contained by oil-sand；
V1--- distilled water washes out oil mass, mL；
V2--- surfactant solution washes out oil mass, mL.
10. the washing oil rate analysis method according to claim 1 based on thickening type emulsification surfactants, its feature exist
In in steps of 5, the ratio of the oil mass that distilled water washes out and total oil mass should be less than 5%.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109289695A (en) * | 2018-09-26 | 2019-02-01 | 天津亿利科能源科技发展股份有限公司 | A kind of carboxylic acid surfactant and its preparation method and application |
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| CN103528862A (en) * | 2013-09-27 | 2014-01-22 | 中国石油天然气股份有限公司 | Method for quickly evaluating oil washing effect of oil displacement agent indoors |
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Application publication date: 20180206 |