CN104806214B - A kind of imbibition oil production method and laboratory simulation method suitable for LOW PERMEABILITY RESERVOIR - Google Patents
A kind of imbibition oil production method and laboratory simulation method suitable for LOW PERMEABILITY RESERVOIR Download PDFInfo
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- CN104806214B CN104806214B CN201510127551.9A CN201510127551A CN104806214B CN 104806214 B CN104806214 B CN 104806214B CN 201510127551 A CN201510127551 A CN 201510127551A CN 104806214 B CN104806214 B CN 104806214B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/20—Displacing by water
Abstract
The invention provides a kind of imbibition oil production method and laboratory simulation method suitable for LOW PERMEABILITY RESERVOIR.The method using static imbibition, ring pressure fluctuation imbibition, dynamic drive one or more in imbibition LOW PERMEABILITY RESERVOIR is recovered the oil；Static imbibition is included to the water drive that driven a well after being boiled in a covered pot over a slow fire methodically after the injection imbibition agent of stratum；Ring pressure fluctuation imbibition includes injecting imbibition agent to stratum, 2MPa is incubated 5 70 hours to ring pressure, 4MPa is incubated 5 70 hours, 5 70 hours selectively are incubated in 8MPa even 10MPa (not more than stratum saturation pressure), a cycle is completed, 13 cycles are carried out according to imbibition effect；Dynamic drives imbibition includes that water drive, to aqueous 98%, completes a cycle to water drive again to injection imbibition agent after aqueous 98%, and 15 cycles are carried out according to imbibition effect.The method is a kind of imbibition DP technology of combining dynamic and static research, can be applied to special hypotonic, Oil in Super-low Permeability oil reservoir, has the recovery ratio effect that increases significantly.
Description
Technical field
The invention provides a kind of imbibition oil production method and laboratory simulation method suitable for LOW PERMEABILITY RESERVOIR, belong to oil field
The low-permeability oilfield of development field improves recovery efficiency technique field.
Background technology
China's low permeability oil field average recovery ratio only has 21.4%, and 34% than middle and high infiltration oil field is low by 12.6%.At present
There is more than 50 oil field annual exploitation rate less than 0.5%, about 3.2 hundred million tons of the oil in place in the poorly efficient oil field of these low speed, it is put down
Equal rate of oil production only has 0.27%.
It is the process for utilizing or limiting capillary force effect that imbibition is recovered the oil, and is to change blowhole surface using chemical imbibition agent
Wetability, promote or enhancing imbibition process, a kind of oil production method or skill that reduce hollow billet resistance, improve injection and recovery ratio
Art.Oil reservoir of this oil recovery technique especially to special low, Oil in Super-low Permeability (permeability is in below 10mD) is significant.This oil reservoir
The exploitation problem that difficulty is huge, recovery ratio is low is faced with, reserves are again the realistic problems that dealer must face and solve greatly.Imbibition
Oil recovery technique develops relatively slowly, using less in China.The physics such as water drive, pressure break, Encryption Well and horizontal well and mechanical means are low
The main oil production method that permeability field early stage uses, achieves certain effect, is that the stable yields of low-permeability oilfield is made that contribution, but overall
Development degree is still low, recovery ratio is still low, aqueous at present to rise fast, also most of oil comes without extraction.With industry
The fast development of activating agent, with low-permeability oilfield Persisting exploitation and the demand of volume increase, it is necessary to constantly look for new, more efficiently
Oil production method takes over the raising recovery ratio problem of high water-cut stage low-permeability oilfield, particularly special, effective utilization of Oil in Super-low Permeability oil reservoir
With raising recovery ratio problem.
The content of the invention
In order to solve the above technical problems, it is an object of the invention to provide a kind of imbibition oil recovery side suitable for LOW PERMEABILITY RESERVOIR
Method and laboratory simulation method.The method is a kind of imbibition DP technology of combining dynamic and static research, can be applied to special hypotonic, ultralow
Permeability is hidden.
To reach above-mentioned purpose, the invention provides a kind of imbibition oil production method suitable for LOW PERMEABILITY RESERVOIR, it uses quiet
One or more imbibition oil production methods that state imbibition, ring pressure fluctuation imbibition, dynamic are driven in imbibition carry out imbibition and adopt to LOW PERMEABILITY RESERVOIR
Oil, ring pressure therein fluctuation imbibition and dynamic are driven imbibition and belong to dynamic imbibition；
The static imbibition is comprised the following steps：0.1-1.0PV (preferably 0.3-0.5PV) imbibition agent is injected to stratum
Afterwards, well 0.1-10 month (preferably 1-6 month) is boiled in a covered pot over a slow fire, then driving a well carries out water drive；
The ring pressure fluctuation imbibition is comprised the following steps：0.1-1.0PV imbibition agent is injected to stratum, is adjusted using injection rate
The environmental pressure that fuel-economizing is hidden, is incubated 5-70 hours (preferably 6-12 hours), so under conditions of environmental pressure is 2 ± 0.5MPa
5-70 hours (preferably 6-12 hours) is incubated under conditions of environmental pressure is 4 ± 0.5MPa afterwards, selectively in environment pressure
Power is to be incubated 5-70 hour (preferably 6-12 hours) under the conditions of 8 ± 0.5MPa, selectively environmental pressure for 10 ±
5-70 hours (preferably 6-12 hours) is incubated under conditions of 0.5MPa, a cycle is completed, the 1-3 ring pressure ripple in cycle is carried out
Dynamic imbibition is recovered the oil (in ring pressure fluctuation imbibition oil recovery process, respectively in 2 ± 0.5MPa and 4 ± 0.5MPa insulation a period of times
Afterwards, whether can also be proceeded in 8 ± 0.5MPa even 10 ± 0.5MPa, and need to protect according to actual oil recovery effect selection
The environmental pressure is demonstrate,proved no more than stratum saturation pressure)；The dynamic is driven imbibition and is comprised the following steps：Advanced water-filling is driven to aqueous
More than 98% (producing more than aqueous 98% mass content of oil), then injects 0.1-1.0PV (preferably 0.2- to stratum
0.5PV) imbibition agent, then water drive to aqueous more than 98% is carried out, a cycle is completed, the dynamic for carrying out 1-5 cycle drives imbibition
Recover the oil.
The above-mentioned imbibition oil production method suitable for LOW PERMEABILITY RESERVOIR, it is preferable that in the static imbibition, for super
For LOW PERMEABILITY RESERVOIR, the injection rate of imbibition agent and water is 0.1-0.4m/ days (equivalent to 0.005-0.02mL/min)；For
For special hypotonic and common LOW PERMEABILITY RESERVOIR, the injection rate of imbibition agent and water is 0.1-1.2m/ days (equivalent to 0.005-
0.06mL/min)；The injection pressure of whole static state imbibition process is not higher than stratum saturation pressure.
The above-mentioned imbibition oil production method suitable for LOW PERMEABILITY RESERVOIR, it is preferable that it is described dynamic drive imbibition also include with
Lower step：After imbibition agent is injected, to stratum injection 0.1-0.3PV profile control agents (can start water drive after injection profile control agent).
The above-mentioned imbibition oil production method suitable for LOW PERMEABILITY RESERVOIR, it is preferable that it is described dynamic drive imbibition also include with
Lower step：In (or after injection imbibition agent and profile control agent) stewing well 5-70 hours after injecting imbibition agent, then driving a well again carries out water drive.
During dynamically imbibition is driven, stewing well is carried out after injection imbibition agent, but unlike static imbibition is so boiled in a covered pot over a slow fire for a long time, also different from
The pattern that the continuous driving of conventional displacement process is replaced.The process of this stewing well can be such that the imbibition agent has more with crude oil in capillary
Sufficient action time, to improve tar productivity.The short-term stewing well process be particularly suited for it is common it is hypotonic based on oil reservoir.
The above-mentioned imbibition oil production method suitable for LOW PERMEABILITY RESERVOIR, it is preferable that in the dynamic drives imbibition, imbibition
The injection rate of agent and water is 0.1-1.2m/ days (driving at a slow speed, be particularly suited for special, Oil in Super-low Permeability oil reservoir), and whole dynamic is driven and oozed
The control of injection pressure of journey is drawn through in below 6Mpa.
The above-mentioned imbibition oil production method suitable for LOW PERMEABILITY RESERVOIR, it is preferable that the injection rate of the profile control agent is
0.1-1.2m/ days.
Specific embodiment of the invention, it is preferable that the above-mentioned imbibition oil production method suitable for LOW PERMEABILITY RESERVOIR is adopted
The oil production method for being combined with dynamic imbibition with static imbibition (that is, combined with one or two in dynamic imbibition) is to LOW PERMEABILITY RESERVOIR
Carry out imbibition oil recovery.
Specific embodiment of the invention, it is preferable that for it is common it is hypotonic based on and the special hypotonic oil reservoir in part and
Speech, by the way of dynamically imbibition is driven, it is comprised the following steps the described imbibition oil production method suitable for LOW PERMEABILITY RESERVOIR：First with
The injection rate of 0.1-0.4m/ days carries out water drive to aqueous more than 98%, is then injected to stratum with identical injection rate
0.1-0.5PV imbibition agent, then 0.1-0.3PV profile control agents are injected to stratum with identical injection rate, then injected with identical
Speed carries out water drive to aqueous more than 98%, injects 0.1-1.0PV imbibition agent to stratum with identical injection rate afterwards, boils in a covered pot over a slow fire well
After 12-36 hours, then to drive a well and carry out water drive to aqueous more than 98% with identical injection rate, complete a cycle, carry out
The imbibition in 1-3 cycle is recovered the oil, during inject pressure and be not higher than stratum saturation pressure；
For the oil reservoir for having Oil in Super-low Permeability concurrently based on spy is hypotonic, the described imbibition oil production method suitable for LOW PERMEABILITY RESERVOIR
By the way of imbibition, static imbibition alternately is dynamically driven, it is comprised the following steps：First with the injection speed of 0.1-0.4m/ days
Degree carries out water drive to aqueous more than 98%, then injects 0.1-1.0PV imbibition agent to stratum with identical injection rate, then with phase
Same injection rate carries out water drive to aqueous more than 98%, is oozed to stratum injection 0.1-1.0PV with identical injection rate afterwards
Vapor, boils in a covered pot over a slow fire well 1-10 weeks, then to drive a well and carry out water drive to aqueous more than 98% with identical injection rate, completes a cycle,
The imbibition for carrying out 1-3 cycle is recovered the oil, during inject pressure and be not higher than stratum saturation pressure；
For the oil reservoir (sandstone oil reservoir) based on Oil in Super-low Permeability, the described imbibition oil recovery side suitable for LOW PERMEABILITY RESERVOIR
By the way of based on static imbibition, supplemented by dynamic drive imbibition, it is comprised the following steps method：With the injection speed of 0.1-0.4m/ days
Spend and inject 0.1-1.0PV imbibition agent to stratum, boil in a covered pot over a slow fire well 1-2 month, then to drive a well and carry out water drive to containing with identical injection rate
Water more than 98%, then injects 0.1-1.0PV imbibition agent with identical injection rate to stratum again, boils in a covered pot over a slow fire well 1-2 month, Ran Houkai
Well carries out water drive to aqueous more than 98% with identical injection rate, completes a cycle, and the imbibition for carrying out 1-3 cycle is adopted
Oil, during inject pressure be not higher than stratum saturation pressure.
The above-mentioned imbibition oil production method suitable for LOW PERMEABILITY RESERVOIR, it is preferable that the imbibition agent includes nonionic
The aqueous solution of the combination of one or more in surfactant and anionic surfactant, with the total amount of whole solutes
Meter, the mass concentration of the aqueous solution is 0.1-0.5%, and the mass concentration is more preferably 0.1-0.3%.For example：Fatty alcohol ether sodium
Class nonionic surfactant (such as AESN70 of Zhengzhou Ali Science and Technology Ltd. production), petroleum-sulfonate anionic surface
Activating agent (such as CPS-1 of Changqing oilfields company production, the DPS-1 of Daqing Refinery company production) and its mixture.
The above-mentioned imbibition oil production method suitable for LOW PERMEABILITY RESERVOIR, it is preferable that the profile control agent includes polyacrylamide
Amine aqueous solution, the concentration of the polyacrylamide solution is 10-50mg/L；It is highly preferred that the average mark of the polyacrylamide
Son amount is the (polypropylene that such as Daqing Refinery company and/or Beijing Hengju Chemical Group Co., Ltd produce of 1500-2500 ten thousand
Acid amides).
On the other hand, present invention also offers a kind of imbibition oil recovery laboratory simulation method suitable for LOW PERMEABILITY RESERVOIR, its
Drive one or more the imbibition oil production methods in imbibition and carry out in the lab using static imbibition, ring pressure fluctuation imbibition, dynamic
The simulation that LOW PERMEABILITY RESERVOIR imbibition is recovered the oil, ring pressure therein fluctuation imbibition and dynamic are driven imbibition and belong to dynamic imbibition；
The static imbibition is comprised the following steps：Rock core is put into and fills the imbibition instrument of imbibition agent (preferably
Imbibition instrument disclosed in ZL201120075849.7) in, imbibition instrument high scale pipe is covered, screwed, supplemented imbibition agent to a certain
At scale, imbibition instrument is put into insulating box, at the formation temperature, record extraction oil mass, calculate recovery ratio, experiment carry out to
Untill recovery ratio value no longer changes, record final oil pump capacity, calculate ultimate recovery, as static imbibition overall recovery factor value；
The ring pressure fluctuation imbibition is comprised the following steps：Rock core is put into imbibition instrument (preferably ZL201110252824.4
Disclosed in imbibition instrument) in, injection imbibition agent screws bottom and is vented to full of the core chamber in imbibition instrument, checks without gas leakage
Afterwards, be put into insulating box, even good circuit, open ring pressure equipment and beat to preset pressure value, at the formation temperature, ring pressure 2 ±
Keep a period of time to oil pump capacity stabilization under the conditions of 0.5Mpa, recovery ratio value no longer changes, then pressure-raising to 4 ± 0.5Mpa,
Selectively pressure-raising to 8 ± 0.5Mpa, selectively pressure-raising is to 10 ± 0.5Mpa, respectively to oil pump capacity stabilization, recovery ratio value not
Untill changing again, a cycle is completed, the ring pressure fluctuation imbibition for carrying out 1-3 cycle is recovered the oil, calculate ring pressure fluctuation imbibition and always adopt
Yield；
The dynamic drives imbibition, and (device that dynamic drive imbibition laboratory simulation method is used is conventional core physical analogy
Device, the device as disclosed in standard SY/T6424-2000) comprise the following steps：Rock core is put into core holding unit, perseverance is put into
In incubator, connection line simultaneously detects seal, and at the formation temperature, advanced water-filling is driven to aqueous more than 98%, record extraction
Oil mass, is then injected into 0.1-1.0PV imbibition agent, then carries out water drive to aqueous more than 98%, records the oil mass of extraction, completes one
Cycle, the dynamic for carrying out 1-5 cycle drives imbibition oil recovery, calculates dynamic and drives imbibition recovery ratio.
In above-mentioned laboratory simulation method, the specific steps that each imbibition process can include are (as dynamic drives imbibition
During injection, the short-term stewing well of profile control agent etc.) and the injection rate of imbibition agent, the selection of imbibition agent, imbibition agent and water
Injection rate etc. it is identical with the imbibition oil production method suitable for LOW PERMEABILITY RESERVOIR that the present invention is provided, no longer go to live in the household of one's in-laws on getting married herein
State.
In above-mentioned laboratory simulation method, it is preferable that the rock core is the test according to standard SY/T6424-2000
The basic parameters such as method test perm-plug method, porosity, length, diameter, vacuumize rear saturation water, again saturated oils, Ran Houfang
Put in insulating box the rock core of aging more than 15 days under reservoir temperature.
In oil production method of the invention, it should be noted that, it is however generally that, permeability is represented in the oil reservoir of 0.1-1.0mD
Oil in Super-low Permeability oil reservoir, permeability represents ultralow permeable reservoir in the oil reservoir of 1.0-10.0mD, and permeability is higher than 10.0mD, less than 100mD
Oil reservoir represent common LOW PERMEABILITY RESERVOIR.
The imbibition oil production method suitable for LOW PERMEABILITY RESERVOIR that the present invention is provided uses the imbibition DP technology of combining dynamic and static research,
For the effective exploitation of special, extra-low-permeability reservoir provides new oil production method, it has advantages below：(1) broken traditional
The idea of static imbibition, is not limited to a kind of technique, and 20-50% is improved than simple drive and static stewing recovery ratio；(2) dynamic is driven
Process consider reservoir characteristic, will not always be carried out with speed higher, employ flexible slug design, speed-optimization,
The various method of combination, improves deep suction efficiency to greatest extent；(3) static imbibition efficiency is substantially increased, several by boiling in a covered pot over a slow fire well originally
To half a year or several years, can shorten to 1 to 3,4 months within individual month, oily wet oil is hidden has good wettability reversal function；(4) it is best
Played the collaboration advantage of group technology, the resultant effect of imbibition process is improve, for practical application provides effective way.
Specific embodiment
In order to be more clearly understood to technical characteristic of the invention, purpose and beneficial effect, now to skill of the invention
Art scheme carry out it is described further below, but it is not intended that to it is of the invention can practical range restriction.
Preparatory work of experiment
Selection meets the rock core of target block permeability range, and permeability represents ultralow permeability in the rock core of 0.1-1.0mD
Hide, permeability represents ultralow permeable reservoir in the rock core of 1.0-10.0mD, permeability is higher than 10.0mD, the rock core generation less than 100mD
The common LOW PERMEABILITY RESERVOIR of table.The gas of the method for testing testing rock core before rock core saturated oils according to standard SY/T6424-2000 surveys infiltration
The basic parameters such as rate, porosity, length, diameter, vacuumize rear saturation water, again saturated oils, and rock core then is placed into insulating box
In under reservoir temperature aging more than 15 days it is standby.
It is the imbibition instrument disclosed in ZL201120075849.7 that used imbibition instrument is tested in static imbibition, the application by its
Quote in full in this as reference.
It is the imbibition instrument disclosed in ZL201110252824.4, the application that used imbibition instrument is tested in ring pressure fluctuation imbibition
The full patent texts are incorporated in this as reference.
It is conventional core physical simulating device, such as standard SY/T6424-2000 that dynamic is driven imbibition and tests used device
Disclosed in device, the application quoted in full in this as reference.
Embodiment 1
The present embodiment provides static imbibition experiment.Test the rock core for using and be natural outcrop rock core, the size of rock core and
Physical property is as shown in table 1.
The step of static imbibition is tested be：The rock core of saturated oils, aging certain hour is put into and fills imbibition agent (imbibition
Agent is an aqueous solution, and its mass concentration is generally 0.1-0.3%) imbibition instrument in, cover imbibition instrument high scale pipe, screw,
At supplement imbibition agent to a certain scale, imbibition instrument is put into insulating box and is incubated some days at the formation temperature, record oozes daily
The oil mass that suction goes out, calculates imbibition recovery ratio, and the value is static imbibition recovery ratio during imbibition, and experiment carries out to imbibition harvesting
Untill rate value no longer changes, record final oil pump capacity, calculate final imbibition recovery ratio, as static imbibition overall recovery factor value.It is right
In each rock core, using 2-4 kind imbibition agent, experimentation is repeated.Experimental result is as shown in table 1.The imbibition agent that is used and
The number of days for starting to change is as shown in table 2.
Table 1
Table 2
In table 2, Z410-2 is that (mean molecule quantity is 2000 to Sodium Polyacrylate, is by the Guangzhou gold Luan limited public affairs of chemical industry
Department's production), YS114-2 is that aerosol-OT salt (is produced by Jin Long Chemical Co., Ltd.s of Huantai County of Shandong Province
, the trade mark is penetrant t, and active constituent content is not less than 30%, pH=5.0-7.0), DS-21 is that (Tween 80 is by river to T80
The production of Su Sheng Hai'an petrochemical plant), penetrating agent JFC is produced by Jiangsu Hai'an Petrochemical Plant, AESN70 be by
The production of Zhengzhou Ali Science and Technology Ltd., CPS-1 is produced by Changqing oilfields company, and DPS-1 is by Daqing Refinery company
Production.All imbibition agent are used in form of an aqueous solutions.
In this 7 experiment rock cores, first two is common hypotonic (permeability is higher than 10mD) rock core, and third and fourth is super
Hypotonic (permeability is less than 1.0mD) rock core, remaining three rock cores are special hypotonic (permeability is higher than 1.0mD, less than 10mD).Commonly
The average recovery ratio of the static imbibition experiment of two hypotonic rock cores is 65.17%, the static imbibition of special three hypotonic rock cores
The average imbibition recovery ratio of experiment is 64.41%, and both are more or less the same.But the static imbibition experiment of two rock cores of Oil in Super-low Permeability
Average recovery ratio is 71.89%, higher than the above two, and this is just illustrating that capillary thickness and pore size have to static imbibition effect
Significantly affect.The static imbibition recovery ratio average out to 66.76% of 7 rock cores of the above.Although static imbibition elapsed time is more long,
To ooze chemical flooding overall recovery factor high than middle and high for effect.The height of remarkable result especially can not be being played with Typical physical and mechanical means
Water-cut stage, it is very worth election to take most of remaining oil that this method starts residual oil and Oil in Super-low Permeability with reference to reservoir characteristic
Method.
Embodiment 2
The present embodiment provides ring pressure fluctuation imbibition experiment, and the fluctuation imbibition of ring pressure and static imbibition combination experiment.
Ring pressure fluctuation imbibition is the step of test：Using 2 natural outcrop rock cores, perm-plug method be respectively 0.91mD and
Behind 1.00mD, saturated oils and aging 9 days and 25 days, sampling is put into imbibition instrument (pressure-resistant), injection imbibition agent (Changqing oilfields company
The aqueous solution of the CPS-1 of production, mass concentration is 0.1-0.3%) to core chamber is full of, screws bottom and be vented, check without leakage
After gas, be put into the insulating box for having heated up, even good circuit, open ring pressure equipment and beat to preset pressure value, at the formation temperature
(70 DEG C), under the conditions of ring pressure 2Mpa kept for a period of time to oil pump capacity stabilization, then pressure-raising is to 4Mpa, 8Mpa, 10Mpa, respectively
To oil pump capacity stabilization, a cycle is completed, the ring pressure fluctuation imbibition for carrying out 2 cycles is recovered the oil, and terminates experiment, calculates total harvesting
Rate.This process does not have single water drive and water stewing.The recovery ratio of two ring pressure fluctuation imbibition experiments of rock core is respectively
28.23% and 51.60%.
Two rock cores are transferred to the experimentation of static imbibition after closure ring pressure fluctuation imbibition, are tested using static imbibition and used
In ground imbibition instrument, injection imbibition agent (aqueous solution of the CPS-1 of Changqing oilfields company production, mass concentration is 0.1-0.3%)
After be put into insulating box, oil pump capacity is recorded daily, daily imbibition recovery ratio value is calculated untill the value no longer changes, finally
Balance imbibition recovery ratio be ring pressure fluctuation imbibition switch to the static imbibition recovery ratio after static imbibition.This of two rock cores is quiet
State imbibition recovery ratio is respectively 59.63% and 48.40% (lasting 92 and 36 days).
Two rock cores are respectively 87.86% and 100.0% by overall recovery factor after dynamic and static imbibition.
The results show, the effect that the technology mode that the fluctuation imbibition of ring pressure is combined with static imbibition is obtained is more quiet than simple
The recovery ratio of state imbibition improves very many, and the cycle of whole experiment is also shortened a lot, and efficiency is substantially increased.
Embodiment 3
The present embodiment provides dynamic and drives imbibition experiment, and dynamic drives imbibition with static imbibition combination experiment.Experiment is used
Rock core be natural outcrop rock core, the size and physical property of rock core are as shown in table 3.
Dynamic is driven the step of imbibition is tested：By saturated oils and aging good rock core is put into core holding unit, connection line
And seal is detected, at 70 DEG C (experimental temperature is determined according to the oil selected), first under the speed of 0.01mL/min at a slow speed
Water drive, it is also possible to suitably raised speed according to pressure changing, is driven to aqueous more than 98%, records waterflood recovery efficiency factor value, then notes
Vapor (aqueous solution of the DPS-1 of Daqing Refinery company production, mass concentration is 0.1-0.3%) 0.3-0.5PV is infiltrated, 12- is boiled in a covered pot over a slow fire
Water drive to aqueous more than 98% is carried out after 48 hours again, the recovery ratio that this section drives is recorded, the recovery ratio with above water drive is added i.e.
It is that total dynamic drives imbibition recovery ratio.
After terminating dynamic drive imbibition, then static imbibition is carried out, using static imbibition experiment with ground imbibition instrument, injection is oozed
It is put into insulating box after vapor (aqueous solution of the DPS-1 of Daqing Refinery company production, mass concentration is 0.1-0.3%), daily
Untill the value no longer changes, last balance imbibition recovery ratio is the daily imbibition recovery ratio value of record oil pump capacity, calculating
Imbibition is driven for dynamic switch to the static imbibition recovery ratio after static imbibition.
Dynamic is driven into imbibition recovery ratio and static imbibition recovery ratio is added as dynamic drive imbibition and combines work with static imbibition
The overall recovery factor of skill.Experimental result is as shown in table 3.
Table 3
Go out from the experimental results, the dynamic of first stage is driven and all achieves preferable effect, special 4 hypotonic rock core dynamics
It is 47.09% to drive average recovery ratio, and common 4 hypotonic average recovery ratios of rock core are 55.63%.Hole and permeability are got over
Low, it is better that dynamic drives effect, it was demonstrated that middle and high permeability hides the fact that be adapted to combination flooding.Carried out again respectively after dynamically driving
Static imbibition, as a result special hypotonic static imbibition average recovery ratio is 50.45%, the static imbibition of common 4 hypotonic rock cores
Average recovery ratio is 43.16%, and the result in this stage is just opposite with dynamic.Because the static imbibition stage relies primarily on hair
The effect of Guan Li, it is different from the process that dynamic is driven.Now, capillary force is bigger or hollow billet resistance reduces more, and imbibition effect is got over
It is good.Two class rock cores have reached more than 97% by overall recovery factor after two imbibitions of stage two ways, close to 100%.This
Illustrate, the combination of two kinds of imbibition modes substantially increases imbibition recovery ratio.Compared with Example 2, in the dynamic imbibition stage, dynamic
The effect for driving imbibition becomes apparent from than the effect of ring pressure fluctuation imbibition, and total average recovery ratio is higher.The selection of imbibition technique and group
Conjunction can realize more preferable effect.
Claims (17)
1. a kind of imbibition oil production method suitable for LOW PERMEABILITY RESERVOIR, it uses static imbibition, ring pressure fluctuation imbibition, dynamic to drive imbibition
In one or more imbibition oil production methods carry out imbibition oil recovery to LOW PERMEABILITY RESERVOIR, ring pressure therein fluctuation imbibition and dynamic drive are oozed
Suction belongs to dynamic imbibition；
The static imbibition is comprised the following steps：After to stratum injection 0.1-1.0PV imbibition agent, well 0.1-10 is boiled in a covered pot over a slow fire individual month, then
Driving a well carries out water drive；
The ring pressure fluctuation imbibition is comprised the following steps：0.1-1.0PV imbibition agent is injected to stratum, oil is adjusted using injection rate
The environmental pressure of Tibetan, 5-70 hour is incubated under conditions of environmental pressure is 2 ± 0.5MPa, then environmental pressure for 4 ±
5-70 hours is incubated under conditions of 0.5MPa, a cycle is completed, the ring pressure fluctuation imbibition for carrying out 1-3 cycle is recovered the oil；
The dynamic is driven imbibition and is comprised the following steps：Advanced water-filling is driven to aqueous more than 98%, then injects 0.1- to stratum
1.0PV imbibition agent, then water drive to aqueous more than 98% is carried out, a cycle is completed, the dynamic drive imbibition for carrying out 1-5 cycle is adopted
Oil.
2. the imbibition oil production method suitable for LOW PERMEABILITY RESERVOIR according to claim 1, wherein, in the static imbibition,
For Oil in Super-low Permeability oil reservoir, the injection rate of imbibition agent and water is 0.1-0.4m/ days；For the hypotonic and common hypotonic oil of spy
For Tibetan, the injection rate of imbibition agent and water is 0.1-1.2m/ days；The injection pressure of whole static state imbibition process is not higher than
Layer saturation pressure.
3. the imbibition oil production method suitable for LOW PERMEABILITY RESERVOIR according to claim 1, wherein, the ring pressure fluctuation imbibition is entered
One step is comprised the following steps：After insulation under conditions of environmental pressure is 4 ± 0.5MPa 5-70 hours, then in environmental pressure it is
5-70 hours is incubated under conditions of 8 ± 0.5MPa, a cycle is completed.
4. the imbibition oil production method suitable for LOW PERMEABILITY RESERVOIR according to claim 3, wherein, the ring pressure fluctuation imbibition is more
It is further comprising the steps：5-70 hours is incubated under conditions of environmental pressure is 4 ± 0.5MPa, then is 8 in environmental pressure
After being incubated 5-70 hours under conditions of ± 0.5MPa, 5-70 hours is incubated under conditions of environmental pressure is 10 ± 0.5MPa,
Complete a cycle.
5. the imbibition oil production method suitable for LOW PERMEABILITY RESERVOIR according to claim 1, wherein, the dynamic is driven imbibition and is also wrapped
Include following steps：After imbibition agent is injected, 0.1-0.3PV profile control agents are injected to stratum.
6. the imbibition oil production method suitable for LOW PERMEABILITY RESERVOIR according to claim 1, wherein, the dynamic is driven imbibition and is also wrapped
Include following steps：Well is boiled in a covered pot over a slow fire after imbibition agent is injected 5-70 hours, then driving a well again carries out water drive.
7. the imbibition oil production method suitable for LOW PERMEABILITY RESERVOIR according to claim 1,5 or 6, wherein, driven in the dynamic
In imbibition, the injection rate of imbibition agent and water is 0.1-1.2m/ days, and the control of injection pressure that whole dynamic drives imbibition process exists
Below 6Mpa.
8. the imbibition oil production method suitable for LOW PERMEABILITY RESERVOIR according to claim 5, wherein, the injection speed of the profile control agent
Spend is 0.1-1.2m/ days.
9. the imbibition oil production method suitable for LOW PERMEABILITY RESERVOIR according to claim 1, it uses static imbibition and dynamic to ooze
The oil production method for inhaling combination carries out imbibition oil recovery to LOW PERMEABILITY RESERVOIR.
10. the imbibition oil production method suitable for LOW PERMEABILITY RESERVOIR according to claim 1, for it is common it is hypotonic based on and part
For special hypotonic oil reservoir, by the way of dynamically imbibition is driven, it is wrapped the described imbibition oil production method suitable for LOW PERMEABILITY RESERVOIR
Include following steps：Water drive to aqueous more than 98% was first carried out with the injection rate of 0.1-0.4m/ days, speed is then injected with identical
Spend and inject 0.1-0.5PV imbibition agent to stratum, then 0.1-0.3PV profile control agents are injected to stratum with identical injection rate, then
Water drive to aqueous more than 98% is carried out with identical injection rate, 0.1- is injected to stratum with identical injection rate afterwards
1.0PV imbibition agent, boiled in a covered pot over a slow fire well after 12-36 hours, then to drive a well and carry out water drive to aqueous more than 98% with identical injection rate, complete
Into a cycle, carry out the 1-3 imbibition in cycle and recover the oil, during inject pressure and be not higher than stratum saturation pressure；
For the oil reservoir for having Oil in Super-low Permeability concurrently based on spy is hypotonic, the described imbibition oil production method suitable for LOW PERMEABILITY RESERVOIR is used
Dynamic drives imbibition, static imbibition mode alternately, and it is comprised the following steps：First entered with the injection rate of 0.1-0.4m/ days
Water-filling is driven to aqueous more than 98%, then injects 0.1-1.0PV imbibition agent to stratum with identical injection rate, then with identical
Injection rate carries out water drive to aqueous more than 98%, injects 0.1-1.0PV imbibition agent to stratum with identical injection rate afterwards,
Stewing well 1-10 weeks, then to drive a well and carry out water drive to aqueous more than 98% with identical injection rate, completes a cycle, carries out 1-
The imbibitions in 3 cycles are recovered the oil, during inject pressure and be not higher than stratum saturation pressure；
For the oil reservoir based on Oil in Super-low Permeability, the described imbibition oil production method suitable for LOW PERMEABILITY RESERVOIR is using static imbibition
Based on, dynamic drive imbibition supplemented by mode, it is comprised the following steps：Injected to stratum with the injection rate of 0.1-0.4m/ days
0.1-1.0PV imbibition agent, boils in a covered pot over a slow fire well 1-2 month, then to drive a well and carry out water drive to aqueous more than 98% with identical injection rate, so
0.1-1.0PV imbibition agent is injected to stratum with identical injection rate again afterwards, is boiled in a covered pot over a slow fire well 1-2 month, then driven a well and noted with identical
Entering speed carries out water drive to aqueous more than 98%, completes a cycle, carries out the 1-3 imbibition in cycle and recovers the oil, during injection
Pressure is not higher than stratum saturation pressure.
The 11. imbibition oil production method suitable for LOW PERMEABILITY RESERVOIR according to any one of claim 1,2,5,6 and 10, its
In, the imbibition agent includes the combination of one or more in nonionic surface active agent and anionic surfactant
The aqueous solution, in terms of the total amount of whole solutes, the mass concentration of the aqueous solution is 0.1-0.5%.
The 12. imbibition oil production methods suitable for LOW PERMEABILITY RESERVOIR according to claim 7, wherein, the imbibition agent includes non-
The aqueous solution of the combination of one or more in ionic surfactant and anionic surfactant, with whole solutes
Total amount meter, the mass concentration of the aqueous solution is 0.1-0.5%.
The 13. imbibition oil production method suitable for LOW PERMEABILITY RESERVOIR according to any one of claim 5,8 and 10, wherein, institute
Stating profile control agent includes polyacrylamide solution, and the concentration of the polyacrylamide solution is 10-50mg/L.
The 14. imbibition oil production methods suitable for LOW PERMEABILITY RESERVOIR according to claim 13, wherein, the polyacrylamide
Mean molecule quantity is 1500-2500 ten thousand.
A kind of 15. imbibition oil recovery laboratory simulation methods suitable for LOW PERMEABILITY RESERVOIR, it uses static imbibition, ring pressure fluctuation to ooze
One or more imbibition oil production methods that suction, dynamic are driven in imbibition carry out the simulation of LOW PERMEABILITY RESERVOIR imbibition oil recovery in the lab,
Ring pressure therein fluctuation imbibition and dynamic are driven imbibition and belong to dynamic imbibition；
The static imbibition is comprised the following steps：Rock core is put into the imbibition instrument for filling imbibition agent, covers imbibition instrument top quarter
Degree is managed, screwed, supplementing at imbibition agent to a certain scale, and imbibition instrument is put into insulating box, at the formation temperature, record extraction
Oil mass, calculates recovery ratio, experiment carries out to recovery ratio value no longer changing, records final oil pump capacity, calculates ultimate recovery,
As static imbibition overall recovery factor value；
The ring pressure fluctuation imbibition is comprised the following steps：Rock core is put into imbibition instrument, injection imbibition agent is to full of in imbibition instrument
Core chamber, screw bottom and be vented, after checking without gas leakage, be put into insulating box, even good circuit, open ring pressure equipment and beat to pre-
If pressure value, at the formation temperature, a period of time to oil pump capacity stabilization, recovery ratio value is kept under the conditions of ring presses 2 ± 0.5Mpa
Untill no longer changing, then pressure-raising no longer changing to oil pump capacity stabilization, recovery ratio value, completes a week to 4 ± 0.5Mpa
Phase, the ring pressure fluctuation imbibition for carrying out 1-3 cycle is recovered the oil, and calculates ring pressure fluctuation imbibition overall recovery factor；
The dynamic is driven imbibition and is comprised the following steps：Rock core is put into core holding unit, is put into insulating box, connection line is simultaneously examined
Seal is surveyed, at the formation temperature, advanced water-filling is driven to aqueous more than 98%, records the oil mass of extraction, is then injected into 0.1-
1.0PV imbibition agent, then water drive to aqueous more than 98% is carried out, the oil mass of extraction is recorded, a cycle is completed, carry out 1-5 week
The dynamic of phase is driven imbibition and is recovered the oil, and is calculated dynamic and is driven imbibition recovery ratio.
16. analogy methods according to claim 15, wherein, the ring pressure fluctuation imbibition is comprised the following steps：By rock core
It is put into imbibition instrument, injection imbibition agent screws bottom and be vented to full of the core chamber in imbibition instrument, after checking without gas leakage, puts
Enter in insulating box, even good circuit, unlatching ring pressure equipment are beaten to preset pressure value, press 2 ± 0.5Mpa bars at the formation temperature, in ring
Keeping a period of time no longer to change to oil pump capacity stabilization, recovery ratio value under part, then pressure-raising is to 4 ± 0.5Mpa, to oil pump capacity
Untill stabilization, recovery ratio value no longer change, then pressure-raising no longer becomes to oil pump capacity stabilization, recovery ratio value and turns to 8 ± 0.5Mpa
Only, a cycle is completed, the ring pressure fluctuation imbibition for carrying out 1-3 cycle is recovered the oil, and calculates ring pressure fluctuation imbibition overall recovery factor.
17. analogy methods according to claim 15, wherein, the ring pressure fluctuation imbibition is comprised the following steps：By rock core
It is put into imbibition instrument, injection imbibition agent screws bottom and be vented to full of the core chamber in imbibition instrument, after checking without gas leakage, puts
Enter in insulating box, even good circuit, unlatching ring pressure equipment are beaten to preset pressure value, press 2 ± 0.5Mpa bars at the formation temperature, in ring
Keeping a period of time no longer to change to oil pump capacity stabilization, recovery ratio value under part, then pressure-raising is to 4 ± 0.5Mpa, to oil pump capacity
Untill stabilization, recovery ratio value no longer change, then pressure-raising no longer becomes to oil pump capacity stabilization, recovery ratio value and turns to 8 ± 0.5Mpa
Only, then pressure-raising is to 10 ± 0.5Mpa, no longer changing to oil pump capacity stabilization, recovery ratio value, a cycle is completed, carries out 1-3
The ring pressure fluctuation imbibition in individual cycle is recovered the oil, and calculates ring pressure fluctuation imbibition overall recovery factor.
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| CN109187923A (en) * | 2018-09-12 | 2019-01-11 | 中国石油天然气股份有限公司 | A kind of seam net Fractured Reservoir imbibition oil recovery effect experiment evaluation method |
| CN109856014A (en) * | 2019-01-22 | 2019-06-07 | 中国石油天然气股份有限公司 | Wetability experimental method, equipment and the system of a kind of imbibition agent or oil displacement agent |
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