CN106337674A - Method for increasing daily output of tight oil of single well - Google Patents
Method for increasing daily output of tight oil of single well Download PDFInfo
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- CN106337674A CN106337674A CN201610767412.7A CN201610767412A CN106337674A CN 106337674 A CN106337674 A CN 106337674A CN 201610767412 A CN201610767412 A CN 201610767412A CN 106337674 A CN106337674 A CN 106337674A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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 OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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Abstract
The invention provides a method for increasing daily output of tight oil of a single well. The method for increasing the daily output of the tight oil of the single well comprises: carrying out high-pressure pulse water injection on a tight oil reservoir through a water injection well, thus enabling the tight oil reservoir to vibrate; exploiting the tight oil in the tight oil reservoir through an oil well, wherein the exploiting duration is first preset duration; closing the oil well after the first preset duration. The method for increasing the daily output of the tight oil of the single well, provided by the invention, can effectively increase the daily output of the tight oil of the single well, so that the exploiting efficiency and the recovery efficiency are increased.
Description
Technical field
The present invention relates to oil exploitation technology, more particularly, to a kind of method improving the fine and close oil individual well daily output.
Background technology
The exploration and development of fine and close oil is taken seriously in recent years, China's fine and close oil aboundresources, the densification of main sedimentary basin
Oily stock number is about 70～90 × 108m3, the fine and close oil of exploitation is to slowing down China's oil import volume, to ensure that energy security has important
Meaning.
Exploit fine and close oil adopts the technology such as horizontal well multistage pressure break, volume fracturing more in prior art, obtain preferably
Initial production.But because fine and close, the fine and close oil reservoir pore pressure coefficient of terrestrial facies fine and close oil reservoir is low, fine and close oil viscosity is high, seepage flow
Complicated mechanism, fine and close oil early stage recovery process is blowdown in addition, there is a problem of that the fine and close oil individual well daily output successively decreases fast.
Content of the invention
The present invention provides a kind of method improving the fine and close oil individual well daily output, to overcome fine and close oil individual well day in prior art
The fast problem of production decline.
The present invention provides a kind of method improving the fine and close oil individual well daily output, comprising:
High-voltage pulse water filling is carried out to described fine and close oil reservoir by water injection well, so that described fine and close oil reservoir shakes
Dynamic；
By the fine and close oil in oil reservoir fine and close described in oil mining, a length of first preset duration during exploitation；
After experiencing described first preset duration, close described oil well.
Method as above, a length of second preset duration when described oil well is pent, described water injection well is described the
It is in charging state, methods described also includes in two preset duration:
After experiencing described second preset duration, by the fine and close oil in oil reservoir fine and close described in described oil mining, and
In described recovery process, described water injection well is in charging state；
After experiencing described first preset duration, close described oil well and described water injection well, described oil well and described water filling
A length of described second preset duration when well is pent；
After experiencing described second preset duration, open described oil well and described water injection well, then it is pre- to experience described first
If after duration, close described oil well and described water injection well；
Repeat the process that oil well and water injection well are simultaneously open or simultaneously close off, until the water content of described fine and close oil
During higher than default water content, stop the exploitation of fine and close oil.
Method as above, a length of described second preset duration when described oil well is pent, described water injection well is in institute
State and in the second preset duration, be in charging state, methods described also includes:
After experiencing described second preset duration, close described water injection well, and by oil fine and close described in described oil mining
Fine and close oil in reservoir；
After experiencing described first preset duration, open described water injection well, close described oil well, when described water injection well is opened
A length of second preset duration when length is pent with described oil well；
After experiencing described second preset duration, open described oil well, then after experiencing described first preset duration, open institute
State water injection well, close described oil well；
Repeat described oil well and replace, with described water injection well, the process opened, until the water content of described fine and close oil is higher than
During default water content, stop the exploitation of fine and close oil.
Method as above, described high-voltage pulse water filling is carried out to described fine and close oil reservoir by water injection well before,
Also include:
Volume fracturing is carried out to described fine and close oil reservoir by described water injection well and described oil well；
Blowdown is carried out to the fine and close oil reservoir after volume fracturing；
When determining that the fine and close oil individual well daily output is less than the first default yield, stop blowdown.
Method as above, described default water content is to exploit water content, when the water content of described fine and close oil is higher than
When can exploit water content, after stopping the exploitation of fine and close oil, also include:
Using ultrasound wave, described fine and close oil reservoir is processed, so that described fine and close oil reservoir sets up new oil-water seepage
Passage, the generating meanss of described ultrasound wave are disposed on the outer wall of horizontal segment water injection pipe；
By the fine and close oil in oil reservoir fine and close described in oil mining, a length of 3rd preset duration during exploitation；
After experiencing described 3rd preset duration, close described oil well.
Method as above, a length of 4th preset duration when described oil well is pent, described ultrasound wave fills
Put and be in open mode in described 4th preset duration, methods described also includes:
After experiencing described 4th preset duration, by the fine and close oil in oil reservoir fine and close described in described oil mining, and
In described recovery process, the generating meanss of described ultrasound wave are in open mode；
After experiencing described 3rd preset duration, close the generating meanss of described oil well and described ultrasound wave, described oil well
A length of 5th preset duration when pent with the generating meanss of described ultrasound wave；
After experiencing described 5th preset duration, open described oil well and the generating meanss of described ultrasound wave, then experience
After described 3rd preset duration, close the generating meanss of described oil well and described ultrasound wave；
Repeat the process that the generating meanss of described oil well and described ultrasound wave are simultaneously open or simultaneously close off, until
When the water content of described fine and close oil is higher than economic limit implication amount, stop the exploitation of fine and close oil；Described in wherein different cycles are closed
The duration of oil well differs.
Method as above, a length of 4th preset duration when described oil well is pent, described ultrasound wave fills
Put and be in open mode in described 4th preset duration, methods described also includes:
After experiencing described 4th preset duration, close the generating meanss of described note ultrasound wave, and opened by described oil well
Adopt the fine and close oil in described fine and close oil reservoir；
After experiencing described 3rd preset duration, open the generating meanss of described ultrasound wave, close described oil well, described super
The generating meanss of sound wave open duration pent with described oil well when a length of 5th preset duration；
After experiencing described 5th preset duration, open described oil well, close the generating meanss of described ultrasound wave, then experience
After described 3rd preset duration, open the generating meanss of described ultrasound wave, close described oil well；
Repeat described oil well and replace, with the generating meanss of described ultrasound wave, the process opened, until described fine and close oil
When water content is higher than economic limit implication amount, stop the exploitation of fine and close oil, the wherein duration of the described oil well of different cycles closing not
Identical.
Method as above, the horizontal segment of described water injection well includes interval setting and interconnective water injection pipe and waterpower
Oscillation device, the outlet through described hydraulic oscillation device for the described water is in that high-pressure spray shape sprays, to complete described high-voltage pulse
Water filling.
The method improving the fine and close oil individual well daily output of the present invention, is made by high-voltage pulse water filling and/or supersound process
Densification oil reservoir carries out fine and close oil exploitation after vibrating, and mining type is exploited using discontinuous so that fine and close oil reservoir enters
One step is vibrated, and improves the fine and close oil individual well daily output, thus improve production efficiency and recovery ratio.
Brief description
The flow chart of the embodiment of the method one improving the fine and close oil individual well daily output that Fig. 1 provides for the present invention；
Fig. 2 is the corresponding schematic device of embodiment of the method shown in Fig. 1；
The flow chart of the embodiment of the method two improving the fine and close oil individual well daily output that Fig. 3 provides for the present invention；
Fig. 4 is the corresponding schematic device of embodiment of the method shown in Fig. 3；
The flow chart of the embodiment of the method three improving the fine and close oil individual well daily output that Fig. 5 provides for the present invention.
Specific embodiment
Purpose, technical scheme and advantage for making the embodiment of the present invention are clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described it is clear that described embodiment is
The a part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment being obtained under the premise of not making creative work, broadly falls into the scope of protection of the invention.
Fine and close oil is a kind of important petroleum resources, to adopting horizontal well multistage pressure the exploitation of fine and close oil in prior art more
Split, the technology such as volume fracturing, obtain preferable initial production.But due to fine and close, the fine and close oil reservoir hole of terrestrial facies fine and close oil reservoir
Gap pressure coefficient is low, fine and close oil viscosity is high, seepage flow mechanism is complicated, and fine and close oil early stage recovery process is blowdown in addition, deposits
Successively decrease fast problem in the fine and close oil individual well daily output.The present invention is directed to the problems referred to above, proposes a kind of raising fine and close oil individual well daily output
The method of amount, is described in detail to the method for the present invention below.
The flow chart of the embodiment of the method one improving the fine and close oil individual well daily output that Fig. 1 provides for the present invention, as Fig. 1 institute
Show, the method for the present embodiment may include that
S101, carries out high-voltage pulse water filling by water injection well to described fine and close oil reservoir, so that fine and close oil reservoir shakes
Dynamic；
S102, by the fine and close oil in oil mining fine and close oil reservoir, a length of first preset duration during exploitation；
S103, after experience the first preset duration, closes oil well.
Specifically, Fig. 2 is the corresponding schematic device of embodiment of the method shown in Fig. 1.In conjunction with Fig. 1～Fig. 2, horizontal well
Water injection well is divided into vertical section and horizontal segment, and the horizontal segment of water injection well includes interval setting and interconnective water injection pipe 11 and waterpower
Oscillation device 12, the hot water producing through hot water generator's such as ground boiler is laggard through primary pressure pump 13, hot high pressure water station 14
Enter the water injection pipe 11 in water injection well, subsequently enter the hydraulic oscillation device 12 in horizontal segment, hydraulic oscillation occurs mainly in waterpower
In the vibrator cavity of oscillation device 12.High voltage pulse hot water is injected in vibrator cavity astatically, in vibrator cavity
Flowing velocity is much smaller than central jet speed, and the interface of hot water in jet with vibrator cavity exists violent shearing fortune
Move, and ultimately result in the significantly vibrations of shear layer, form the pressure field of a pulsation in vibrator cavity, finally from waterpower
The speed of water of oscillation device 12 ejection, pressure, all in cyclically-varying, thus forming pulsing jet, are realized to fine and close oil reservoir
15 high-voltage pulse water filling.
To fine and close oil reservoir, effect of vibration is applied to the waterpower pulse jet that the high-voltage pulse water filling of fine and close oil reservoir produces,
In addition, hydraulic oscillation device itself can also apply effect of vibration to fine and close oil reservoir, thus realizing vibration processing fine and close oil storage
Layer.
The vibration to fine and close oil reservoir for the waterpower pulse jet of hydraulic oscillation device and its generation, can destroy fine and close oil reservoir
The granule of blocking and rock surface adsorption layer so that it is loosened in duct, can also make the aperture of the hole of fine and close oil reservoir simultaneously
Change, reduce internal pore surface tension force, effectively improve fine and close reservoir permeability, thus being conducive to the exploitation of fine and close oil, single
The well daily output improves.
In addition, the water higher than strata pressure going out with hydraulic oscillation device jet, lead to produce centered on injection well
Uneven distribution pressure field, the transmission of this energy is important by playing to the changes of fine and close oil and fine and close oil reservoir properties
Effect；Water injection well is opened in advance early than oil well, causes continuing to increase of reservoir pressure, forms transient pressure field, and effectively
Feed through to each position of fine and close oil reservoir, after oil well starts to produce, in fine and close oil reservoir, the fine and close oil of each several part all can be because
The change of pressure is employed, thus the scope of the region of bypassed oil reducing.
The waterpower pulse jet of hydraulic oscillation device and its generation is as follows to the vibration principle of fine and close oil reservoir:
(1) hydraulic oscillation device has the displacement vibration in the longitudinal direction of itself, and this vibration is mainly derived from hydraulic oscillation dress
Put the periodic collisions to focus for the inner carrier, this vibration is passed through equipment casing of hydraulic oscillation device etc. and passed to fine and close oil storage
Layer, thus cause fine and close oil storage in the layer elastic displacement vibration.
(2) the waterpower pulse jet that high-voltage pulse water filling produces can produce hydraulic shock wave transversely.During focus work,
The apopore that High-Pressure Water passes through on focus in a pulsed fashion sprays to surrounding space, the equipment set of impact hydraulic oscillation device
Pipe is so as to be deformed the incoming fine and close oil reservoir of energy.
High-voltage pulse water filling is carried out to fine and close oil reservoir by water injection well, so that after fine and close oil reservoir vibrates, opening
Oil well 16 exploits the fine and close oil in fine and close oil reservoir, a length of first preset duration during exploitation.Wherein, first pre- in the present embodiment
If the setting principle of duration is as follows: reduce when the fine and close oil reservoir pressure that exploitation leads to is reduced to the individual well daily output, be no longer appropriate for
Continue to stop exploitation during exploitation, specifically determined with the operational parameter of actual oil well.After experience the first preset duration, oil well is closed
Close.
In whole recovery process in the present embodiment, water injection well is always on, and lasting fine and close oil reservoir is produced is shaken
Action is used, to improve the individual well daily output.
The method improving the fine and close oil day individual well daily output of this enforcement includes: carries out height by water injection well to fine and close oil reservoir
Pressure pulse water flooding, so that fine and close oil reservoir vibrates；By the fine and close oil in oil mining fine and close oil reservoir, a length of during exploitation
First preset duration；After experience the first preset duration, close oil well it is achieved that the raising of the fine and close oil individual well daily output, thus
Improve production efficiency and the recovery ratio of fine and close oil.
Due to the exploitation with fine and close oil, the pressure of fine and close oil reservoir can be gradually lowered, and is unfavorable for the exploitation of fine and close oil, shadow
Ring the raising of the fine and close oil individual well daily output, accordingly, it would be desirable to discontinuous exploitation is carried out to fine and close oil reservoir, i.e. exploitation a period of time
Afterwards, stop fine and close oil exploitation, wait the recovery of fine and close oil reservoir pressure, and then improve the individual well daily output further, reduce exploitation
Cost.The exploitation of this discontinuous can be realized by following two embodiments.
A kind of feasible embodiment is, after above-described embodiment closes described oil well so that when oil well is pent
A length of second preset duration, water injection well is in charging state in the second preset duration；
After experience the second preset duration, by the fine and close oil in oil mining fine and close oil reservoir, and in recovery process,
Water injection well is in charging state；
After experience the first preset duration, close oil well and water injection well, oil well and water injection well are a length of second when pent
Preset duration；
After experience the second preset duration, open oil well and water injection well, then after experiencing the first preset duration, close oil
Well and water injection well；
Repeat the process that oil well and water injection well are simultaneously open or simultaneously close off, until the water content of fine and close oil is higher than
During default water content, stop the exploitation of fine and close oil.
Specifically, experience the closing well of the second preset duration in oil well after, again by oil mining fine and close oil reservoir
Fine and close oil, when a length of first preset duration of the fine and close oil of exploitation, and in recovery process, water injection well is in charging state, then
After the exploitation and high-voltage pulse water filling of experience the first preset duration, close oil well and water injection well, oil well and water injection well are closed
When a length of second preset duration；After the stopping exploitation and stopping high-voltage pulse water filling of experience the second preset duration, open
Oil well and water injection well, then after experiencing exploitation and the high-voltage pulse water filling of the first preset duration, close oil well and water injection well, so
Move in circles, repeat the process that oil well and water injection well are simultaneously open or simultaneously close off, until the water content of fine and close oil is high
When default water content, stop the exploitation of fine and close oil.And the often time of exploitation and the time closing oil well in each repetition period
Identical.
Present embodiment high-voltage pulse water filling while exploitation, can vibrate fine and close oil reservoir in real time in exploitation,
Be conducive to the exploitation of fine and close oil so that the fine and close oil individual well daily output improves and the daily output is than more uniform.
Another kind of feasible implementation is, after the embodiment shown in Fig. 1 closes oil well, the pent duration of oil well
For the second preset duration, water injection well is in charging state in the second preset duration；
After experience the second preset duration, close water injection well, and by the fine and close oil in oil mining fine and close oil reservoir；
After experience the first preset duration, open water injection well, close oil well, it is pent with oil well that duration opened by water injection well
Shi Changwei second preset duration；
After experience the second preset duration, open oil well, then after experiencing the first preset duration, open water injection well, close oil
Well；
Repeat oil well and replace the process opened with water injection well, until the water content of fine and close oil is higher than default water content
When, stop the exploitation of fine and close oil.
Specifically, experience the closing well of the second preset duration in oil well after, water injection well is closed, then opens again by oil well
Adopt the fine and close oil in fine and close oil reservoir, after the fine and close oil exploitation of experience the first preset duration, close oil well, open water injection well,
Water injection well open duration and oil well pent when a length of second preset duration, after experience the second preset duration, be again turned on
Oil well carries out the fine and close oil exploitation of the first preset duration, opens water injection well afterwards, closes oil well, so move in circles and repeat
Oil well replaces the process opened with water injection well, until when the water content of fine and close oil is higher than default water content, stopping opening of fine and close oil
Adopt.
In the present embodiment, water filling with oil recovery alternately, can shorten fine and close oil reservoir pressure in the water filling of oil well down periods
Return to the time of reset pressure, while individual well improves the daily output, improve production efficiency further.
It will be appreciated by persons skilled in the art that discontinuous exploitation is not limited to above two embodiment, also may be used
So that the combination of above two embodiment.
The periodic breaks exploitation of oil well can cause the release-gathering-release cycle of pressure wave in fine and close oil reservoir reciprocal
Effect, the impact that the fluctuation change of this pressure field also causes to fine and close oil reservoir, increased the effect of waterpower pulse fluctuation simultaneously
Really, such that it is able to effective free-boundary problem breaking through fine and close oil, promote the output of crude oil, improve the individual well daily output, and finally
Reach the purpose improving recovery ratio.
Wherein, in above two embodiment, the setting principle of the second preset duration is more than or equal to fine and close oil reservoir pressure
Power returns to the time of reset pressure, and in each cycle, the pent duration of oil well is identical.Default water content is divided into can exploit
Water content and economic limit implication amount, when default water content is can to exploit water content, preferably 40%～50%, contain when default
When the water yield is economic limit implication amount, preferably 90%.
In specific recovery process, due to fine and close oil reservoir low-permeability, and hydraulic shock wave travels to from injection well
Fine and close oil reservoir near oil well is slower, and after leading to oil well to be closed, fine and close oil storage in the layer buildup time is longer, and then
Impact exploitation rate.In order to improve the individual well daily output of fine and close oil further, improve production efficiency and recovery ratio, the present embodiment exists
Make on the basis of a upper embodiment to improve, the embodiment of the method improving the fine and close oil individual well daily output that Fig. 3 provides for the present invention
Two flow chart, Fig. 4 is the corresponding schematic device of embodiment of the method shown in Fig. 3, referring to shown in Fig. 3～Fig. 4, the present embodiment
Method may include that
S301, is processed to fine and close oil reservoir using ultrasound wave, so that fine and close oil reservoir sets up new oil-water seepage leading to
Road, the generating meanss 17 of ultrasound wave are disposed on the outer wall of horizontal segment water injection pipe；
S302, by the fine and close oil in oil mining fine and close oil reservoir, a length of 3rd preset duration during exploitation；
S303, after experience the 3rd preset duration, closes oil well.
Specifically, the method for the present embodiment is in the above-described embodiments " when the water content of fine and close oil is higher than default water content
When, after stopping the exploitation of fine and close oil " carry out, the default water content in the present embodiment is to exploit water content, preferably 40%
Between～50%, that is, once finding that fine and close oil water content is more than the default method exploited water content, that is, open the present embodiment
Carry out the exploitation of fine and close oil.
In the present embodiment, after hydraulic oscillation device being dismantled, on the outer wall of water injection pipe, interval setting is multiple ultrasonic
The generating meanss of ripple are it is also possible to directly install super on the outer wall of the water injection pipe between the hydraulic oscillation device of water injection well horizontal segment
The generating meanss of sound wave, now hydraulic oscillation device no longer work.Wherein, the ultrasound wave sound intensity will reach 0.9w/cm2More than, frequently
Rate reaches 20～30khz, and ultrasonic generator is powered by external cable 18.
In actual recovery process, when the water content fine and close oil is detected is higher than can to exploit water content, oil well is closed,
Then the generating meanss 17 opening ultrasound wave produce ultrasound wave, carry out supersound process to fine and close oil reservoir, so that fine and close oil reservoir
Set up new oil-water seepage passage, the time of supersound process can determine according to actual condition.
To ultrasound wave, to the impact causing of fine and close oil reservoir and the mechanism that can improve the fine and close oil individual well daily output is entered below
Row describes in detail.
First, impact ultrasound wave being caused to fine and close oil reservoir illustrates.
Fine and close oil reservoir matrix is extremely low due to permeability, is in micron to nano grade, therefore after water drive hole throat radius more
Remaining fine and close oil is many to be adsorbed on rock particles surface with the thickness less than adsorption layer, is formed and has viscoplastic fluid flow performance
Special liquid phase layer.The energy under energy coupling is occurred to redistribute relation in oil reservoir according to high-frequency ultrasonic, in fine and close oil
With will produce shear action at the liquid-solid boundary of reservoir.When frequency of sound wave reaches the characteristic frequency of oil reservoir, shear action is maximum,
And fine and close oil phase can occur in hole for the motion of reservoir, lead to the destructurized of fine and close oil in special liquid phase layer so as to
In fine and close oil become Newtonian liquid, its viscosity is identical with oil viscosity fine and close in hole.In this case, increase duct to ooze
Stream effective area, close to mooring leaf property of standing up, fine and close oil can move fluid mobility therein along whole liquid-solid boundary, thus accelerating
The startup of oil droplet, motion, the final output accelerating fine and close oil, improves the well yield of fine and close oil.
Secondly, the mechanism that ultrasound wave can be improved with the fine and close oil individual well daily output illustrates.
(1) release duct blocking: due to cavitation, in the sound field of high-frequency ultrasonic, the bubble in fine and close oil is permissible
Progressively generating and expand, then vanishing suddenly, thus eliminating air-resistance phenomenon.Additionally, High Temperature High Pressure occurs in bubble, after rupture
That fine and close oil near bubble also can form local but strong shock wave, and Shock Wave will produce and significantly shake, in medium
The periodicity shock wave on zigzag corrugated can be formed during middle propagation, cause very big pressure gradient at corrugated, thus can generation office
A series of special effectses such as the High Temperature High Pressure in portion, and finally reduce the thickness of fine and close oil adsorption layer, lead to the oil adsorbing surface layer to take off
Fall, and reduce the viscosity of fine and close oil.
(2) make fine and close oil reservoir produce microcrack: this be due to high frequency waves propagates in reservoir when, cause rock particles work
Linear oscillation exchange effect, this will cause rock particles stress or acoustic pressure to make cyclically-varying, the sound wave in final variable grain
Between occur coupling, formed stress concentration phenomenon, become party phenomenon will result in uncontinuous stress distribution, can be in rock
Stone tensile strength smaller part forms microcrack and does not destroy the structure of whole rock stratum, finally produces microcrack, improves oozing of oil reservoir
Rate thoroughly.
(3) fine and close oil, compact reservoir physical property are changed: the non-linear of the vibration caused by high-frequency ultrasonic can cause some straight
Stream orientation force, wherein most importantly along the radiation pressure in sonic propagation direction, improves the flowing of fluid in fine and close oil reservoir
Ability, promotes the foundation of new fluid swivels.
After ultrasonic Treatment, open the fine and close oil in oil mining fine and close oil reservoir, a length of 3rd preset duration during exploitation；
Wherein, the setting principle of the 3rd preset duration is: when fine and close oil storage in the layer reduced pressure has been not suitable for continuing exploitation, that is, single
When the well daily output cannot improve, close oil well, specifically determined with the operational parameter in actual recovery process.Pre- in experience the 3rd
If after the exploitation of duration, close oil well.
The method improving the fine and close oil individual well daily output of the present embodiment, is processed to fine and close oil reservoir using ultrasound wave,
So that fine and close oil reservoir sets up new oil-water seepage passage, the generating meanss of ultrasound wave are disposed on the outer of horizontal segment water injection pipe
On wall；By the fine and close oil in oil mining fine and close oil reservoir, a length of 3rd preset duration during exploitation；When experience the 3rd is preset
After length, close oil well it is achieved that the vibration again to fine and close oil reservoir for the ultrasound wave, in the relatively high situation of fine and close oil water content
Under improve the fine and close oil individual well daily output further, and then improve recovery ratio.
After fine and close oil water content is more than and can exploit water content, stop high-voltage pulse water filling, after opening ultrasonication
Fine and close oil exploitation, equally can be with the exploitation of fine and close oil, the pressure of fine and close oil reservoir is gradually lowered, and is unfavorable for fine and close oil
Exploitation, the raising of the impact fine and close oil individual well daily output, accordingly, it would be desirable to again discontinuous exploitation is carried out to fine and close oil reservoir, that is, open
After adopting a period of time, stop fine and close oil exploitation, wait the recovery of fine and close oil reservoir pressure, and then improve individual well daily output further
Amount, reduces cost of winning.The exploitation of this discontinuous can be realized by following two embodiments.
A kind of attainable mode is, on the basis of the embodiment shown in Fig. 3, when oil well is pent, a length of 4th is pre-
If duration, the generating meanss of ultrasound wave are in open mode in the 4th preset duration；
After experience the 4th preset duration, by the fine and close oil in oil mining fine and close oil reservoir, and in recovery process,
The generating meanss of ultrasound wave are in open mode；
After experience the 3rd preset duration, close the generating meanss of oil well and ultrasound wave, oil well and ultrasound wave fill
A length of 5th preset duration when putting pent；
After experience the 5th preset duration, open the generating meanss of oil well and ultrasound wave, then experience the 3rd preset duration
Afterwards, the generating meanss of oil well and ultrasound wave are closed；
Repeat the process that the generating meanss of oil well and ultrasound wave are simultaneously open or simultaneously close off, until fine and close oil
When water content is higher than economic limit implication amount, stop the exploitation of fine and close oil；Wherein different cycles close sending out of oil well and ultrasound wave
The duration of generating apparatus differs.
Specifically, experience the closing well of the 4th preset duration in oil well after, by the densification in oil mining fine and close oil reservoir
Oil, and in recovery process, the generating meanss of ultrasound wave are in open mode, in the fine and close oil exploitation of experience the 3rd preset duration
Afterwards, close the generating meanss of oil well and ultrasound wave, the generating meanss of oil well and ultrasound wave when pent a length of 5th default when
Long；After experiencing the 5th preset duration, open the generating meanss of oil well and ultrasound wave, the finer and close oil experiencing the 3rd preset duration
After exploitation, close the generating meanss of oil well and ultrasound wave, the generating meanss quilt of so move in circles execution oil well and ultrasound wave
The process opened simultaneously or simultaneously close off, until when the water content of fine and close oil is higher than economic limit implication amount, stop fine and close oil
Exploitation；Wherein, the duration closing the generating meanss of oil well and ultrasound wave in different cycles differs.
Present embodiment carries out supersound process while exploitation, can the fine and close oily reservoir of supersonic vibration in real time, favorably
In fine and close oily exploitation so that the fine and close oil individual well daily output improves and the daily output is than more uniform.
Another kind of attainable mode is, a length of 4th preset duration, the generating meanss of ultrasound wave when oil well is pent
It is in open mode in the 4th preset duration；
After experience the 4th preset duration, close the generating meanss of ultrasound wave, and by oil mining fine and close oil reservoir
Fine and close oil；
After experience the 3rd preset duration, open the generating meanss of ultrasound wave, close oil well, the generating meanss of ultrasound wave are beaten
Open duration and oil well pent when a length of 5th preset duration；
After experience the 5th preset duration, open oil well, close the generating meanss of ultrasound wave, then experience the 3rd preset duration
Afterwards, open the generating meanss of ultrasound wave, close oil well；
Repeat oil well and replace, with the generating meanss of ultrasound wave, the process opened, until the water content of fine and close oil is higher than warp
During Ji limit water potential, stop the exploitation of fine and close oil, the duration of wherein different cycles closing oil well differs.
Specifically, experience the closing well of the 4th preset duration in oil well after, close the generating meanss of ultrasound wave, then open oil
Fine and close oil in well exploitation fine and close oil reservoir, during exploitation, a length of 3rd preset duration, is then switched off oil well, opens sending out of ultrasound wave
Generating apparatus, close oil well so that the generating meanss of ultrasound wave open duration and oil well pent when a length of 5th preset duration,
After experience the 5th preset duration, it is again turned on oil well, close the generating meanss of ultrasound wave, then after experiencing the 3rd preset duration,
Open the generating meanss of ultrasound wave, close oil well, the execution oil well that so moves in circles is replaced with the generating meanss of ultrasound wave to be opened
Process, until when the water content of fine and close oil is higher than economic limit implication amount, stopping the exploitation of fine and close oil, wherein, different cycles
The duration closing oil well differs.
In the present embodiment, supersound process with oil recovery alternately, can shorten fine and close oil in oil well down periods supersound process
Reservoir pressure returns to the time of reset pressure, while individual well improves the daily output, improves production efficiency further.
It will be appreciated by persons skilled in the art that discontinuous exploitation is not limited to above two embodiment, also may be used
So that the combination of above two embodiment.
The periodic breaks exploitation of oil well can cause the release-gathering-release cycle of pressure wave in fine and close oil reservoir reciprocal
Effect, the impact that the fluctuation change of this pressure field also causes to fine and close oil reservoir, increased the effect of supersound process simultaneously, from
And can effectively break through the free-boundary problem of fine and close oil, promote the output of crude oil, improve the individual well daily output, and be finally reached and carry
The purpose of high recovery rate.
Wherein, in above two embodiment, the time (the 4th preset duration and the 5th preset duration) that oil well is closed sets
Determining principle is to return to the time of reset pressure more than or equal to fine and close oil reservoir pressure, when the 5th preset duration is default more than the 4th
Long the time closing oil well is more and more longer that is to say, that in the present embodiment, this is because fine and close oil recovers pressure to original
The time of pressure is more and more longer.During economic limit implication amount in the present embodiment, preferably 90%.
In order to, on the basis of improving the fine and close oil individual well daily output, reduce production cost as far as possible, this enforcement is to above-mentioned
Embodiment has made further improvement.The embodiment of the method three improving the fine and close oil individual well daily output that Fig. 5 provides for the present invention
Flow chart, as shown in figure 5, the method for the present embodiment in the oil pipe by fine and close oil recovery well to the reservoir mesohigh pulse of fine and close oil
Carry out before water filling, may include that
S501, volume fracturing is carried out to fine and close oil reservoir by water injection well and oil well；
S502, blowdown is carried out to the fine and close oil reservoir after volume fracturing；
S503, when determining that the fine and close oil individual well daily output is less than the first default yield, stop blowdown.
Specifically, because volume fracturing exploitation is the more ripe way in existing oil exploitation, need not be additionally provided
External energy, therefore, is storing up to fine and close oil initially with volume fracturing technology to before fine and close oil reservoir mesohigh pulse water flooding
Layer carries out blowdown, when determining that the fine and close oil individual well daily output is less than the first default yield, then stops blowdown, can
To shorten the cycle of exploitation oil, reduce production cost.Alternatively, the first default yield is crude oil highest daily output during initial exploitation
The 40% of amount.
The present embodiment pass through to before fine and close oil reservoir mesohigh pulse water flooding initially with volume fracturing technology to cause
Close oil reservoir carries out blowdown it is achieved that exploiting the shortening in the cycle of oil, the reduction of production cost.
It will be understood by those skilled in the art that the fine and close oil exploitation of the stopping in the embodiment of the present invention refers to oil well and injection
Well all quits work, and is in end-of-life stage.
Finally it is noted that various embodiments above, only in order to technical scheme to be described, is not intended to limit；To the greatest extent
Pipe has been described in detail to the present invention with reference to foregoing embodiments, it will be understood by those within the art that: its according to
So the technical scheme described in foregoing embodiments can be modified, or wherein some or all of technical characteristic is entered
Row equivalent；And these modifications or replacement, do not make the essence of appropriate technical solution depart from various embodiments of the present invention technology
The scope of scheme.
Claims (8)
1. a kind of method improving the fine and close oil individual well daily output is it is characterised in that include:
High-voltage pulse water filling is carried out to described fine and close oil reservoir by water injection well, so that described fine and close oil reservoir vibrates；
By the fine and close oil in oil reservoir fine and close described in oil mining, a length of first preset duration during exploitation；
After experiencing described first preset duration, close described oil well.
2. method according to claim 1 is it is characterised in that described oil well a length of second preset duration when pent,
Described water injection well is in charging state in described second preset duration, and methods described also includes:
After experiencing described second preset duration, by the fine and close oil in oil reservoir fine and close described in described oil mining, and in institute
State in recovery process, described water injection well is in charging state；
After experiencing described first preset duration, close described oil well and described water injection well, described oil well and described water injection well quilt
When a length of described second preset duration closed；
After experiencing described second preset duration, open described oil well and described water injection well, then experience described first default when
After length, close described oil well and described water injection well；
Repeat the process that oil well and water injection well are simultaneously open or simultaneously close off, until the water content of described fine and close oil is higher than
During default water content, stop the exploitation of fine and close oil.
3. method according to claim 1 is it is characterised in that described oil well a length of second preset duration when pent,
Described water injection well is in charging state in described second preset duration, and methods described also includes:
After experiencing described second preset duration, close described water injection well, and by oil reservoir fine and close described in described oil mining
In fine and close oil；
After experiencing described first preset duration, open described water injection well, close described oil well, described water injection well open duration with
A length of described second preset duration when described oil well is pent；
After experiencing described second preset duration, open described oil well, then after experiencing described first preset duration, open described note
Well, closes described oil well；
Repeat described oil well and replace, with described water injection well, the process opened, until the water content of described fine and close oil is higher than default
During water content, stop the exploitation of fine and close oil.
4. the method according to any one of claims 1 to 3 it is characterised in that described by water injection well to described densification
Before oily reservoir carries out high-voltage pulse water filling, also include:
Volume fracturing is carried out to described fine and close oil reservoir by described water injection well and described oil well；
Blowdown is carried out to the fine and close oil reservoir after volume fracturing；
When determining that the fine and close oil individual well daily output is less than the first default yield, stop blowdown.
5., according to the method in claim 2 or 3 it is characterised in that described default water content is can to exploit water content, work as institute
The water content stating fine and close oil, higher than when can exploit water content, after stopping the exploitation of densification oil, also includes:
Using ultrasound wave, described fine and close oil reservoir is processed, so that described fine and close oil reservoir sets up new oil-water seepage leading to
Road, the generating meanss of described ultrasound wave are disposed on the outer wall of horizontal segment water injection pipe；
By the fine and close oil in oil reservoir fine and close described in oil mining, a length of 3rd preset duration during exploitation；
After experiencing described 3rd preset duration, close described oil well.
6. method according to claim 5 is it is characterised in that described oil well a length of 4th preset duration when pent,
The generating meanss of described ultrasound wave are in open mode in described 4th preset duration, and methods described also includes:
After experiencing described 4th preset duration, by the fine and close oil in oil reservoir fine and close described in described oil mining, and in institute
State in recovery process, the generating meanss of described ultrasound wave are in open mode；
After experiencing described 3rd preset duration, close generating meanss, described oil well and the institute of described oil well and described ultrasound wave
State ultrasound wave generating meanss pent when a length of 5th preset duration；
After experiencing described 5th preset duration, open described oil well and the generating meanss of described ultrasound wave, then experience described
After 3rd preset duration, close the generating meanss of described oil well and described ultrasound wave；
Repeat the process that the generating meanss of described oil well and described ultrasound wave are simultaneously open or simultaneously close off, until described
When the water content of fine and close oil is higher than economic limit implication amount, stop the exploitation of fine and close oil；Wherein different cycles close described oil well
Duration differ.
7. method according to claim 5 is it is characterised in that described oil well a length of 4th preset duration when pent,
The generating meanss of described ultrasound wave are in open mode in described 4th preset duration, and methods described also includes:
After experiencing described 4th preset duration, close the generating meanss of described note ultrasound wave, and pass through described oil mining institute
State the fine and close oil in fine and close oil reservoir；
After experiencing described 3rd preset duration, open the generating meanss of described ultrasound wave, close described oil well, described ultrasound wave
Generating meanss open duration pent with described oil well when a length of 5th preset duration；
After experiencing described 5th preset duration, open described oil well, close the generating meanss of described ultrasound wave, then experience described
After 3rd preset duration, open the generating meanss of described ultrasound wave, close described oil well；
Repeat described oil well and replace, with the generating meanss of described ultrasound wave, the process opened, until described fine and close oil is aqueous
When amount is higher than economic limit implication amount, the duration that described oil well is closed in the exploitation of the fine and close oil of stopping, wherein different cycles differs.
8. method according to claim 1 is it is characterised in that the horizontal segment of described water injection well includes interval setting and mutually
The water injection pipe connecting and hydraulic oscillation device, the outlet through described hydraulic oscillation device for the described water is in that high-pressure spray shape sprays,
To complete described high-voltage pulse water filling.
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| CN106988719A (en) * | 2017-05-09 | 2017-07-28 | 河南理工大学 | The anti-reflection system and anti-reflection method of injection hot water and liquid nitrogen are circulated to coal seam |
| CN113653474A (en) * | 2020-05-12 | 2021-11-16 | 中国石油化工股份有限公司 | Method for realizing green development of high-water-content old oil field |
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| US6012520A (en) * | 1996-10-11 | 2000-01-11 | Yu; Andrew | Hydrocarbon recovery methods by creating high-permeability webs |
| CN102900406A (en) * | 2012-10-10 | 2013-01-30 | 胜利油田高原石油装备有限责任公司 | Pressure-pulse oil well production-increasing device and application method thereof |
| CN104632152A (en) * | 2014-12-15 | 2015-05-20 | 中国石油天然气股份有限公司 | Injection increasing and pressure reducing system and method for water injection well of ultra-low permeability oil field |
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| US6012520A (en) * | 1996-10-11 | 2000-01-11 | Yu; Andrew | Hydrocarbon recovery methods by creating high-permeability webs |
| CN1197152A (en) * | 1997-04-18 | 1998-10-28 | 东北大学 | A water flooding method |
| CN102900406A (en) * | 2012-10-10 | 2013-01-30 | 胜利油田高原石油装备有限责任公司 | Pressure-pulse oil well production-increasing device and application method thereof |
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| CN106988719A (en) * | 2017-05-09 | 2017-07-28 | 河南理工大学 | The anti-reflection system and anti-reflection method of injection hot water and liquid nitrogen are circulated to coal seam |
| CN113653474A (en) * | 2020-05-12 | 2021-11-16 | 中国石油化工股份有限公司 | Method for realizing green development of high-water-content old oil field |
| CN113653474B (en) * | 2020-05-12 | 2023-04-07 | 中国石油化工股份有限公司 | Method for realizing green development of high-water-content old oil field |
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