CN106089166A - A kind of fine and close oil reservoir CO2foam handle up improve recovery ratio method - Google Patents
A kind of fine and close oil reservoir CO2foam handle up improve recovery ratio method Download PDFInfo
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- CN106089166A CN106089166A CN201610443153.2A CN201610443153A CN106089166A CN 106089166 A CN106089166 A CN 106089166A CN 201610443153 A CN201610443153 A CN 201610443153A CN 106089166 A CN106089166 A CN 106089166A
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- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000011084 recovery Methods 0.000 title claims abstract description 27
- 239000003921 oil Substances 0.000 claims abstract description 73
- 239000006260 foam Substances 0.000 claims abstract description 45
- 239000004094 surface-active agent Substances 0.000 claims abstract description 30
- 239000000243 solution Substances 0.000 claims abstract description 25
- 239000010779 crude oil Substances 0.000 claims abstract description 20
- 238000002347 injection Methods 0.000 claims abstract description 17
- 239000007924 injection Substances 0.000 claims abstract description 17
- 238000004519 manufacturing process Methods 0.000 claims abstract description 17
- 239000000758 substrate Substances 0.000 claims abstract description 11
- 238000000605 extraction Methods 0.000 claims abstract description 5
- 230000009467 reduction Effects 0.000 claims abstract description 5
- 238000001914 filtration Methods 0.000 claims abstract description 4
- 239000007864 aqueous solution Substances 0.000 claims description 10
- 230000000694 effects Effects 0.000 claims description 9
- 238000009792 diffusion process Methods 0.000 claims description 7
- 238000003860 storage Methods 0.000 claims description 7
- 238000012546 transfer Methods 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 4
- 229940074404 sodium succinate Drugs 0.000 claims description 4
- ZDQYSKICYIVCPN-UHFFFAOYSA-L sodium succinate (anhydrous) Chemical compound [Na+].[Na+].[O-]C(=O)CCC([O-])=O ZDQYSKICYIVCPN-UHFFFAOYSA-L 0.000 claims description 4
- 238000006073 displacement reaction Methods 0.000 abstract description 14
- 230000008569 process Effects 0.000 abstract description 9
- 230000015572 biosynthetic process Effects 0.000 abstract description 5
- 238000005406 washing Methods 0.000 abstract description 4
- 230000007246 mechanism Effects 0.000 abstract description 2
- 238000005187 foaming Methods 0.000 abstract 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 230000005465 channeling Effects 0.000 description 5
- 239000011159 matrix material Substances 0.000 description 5
- 238000000280 densification Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000004088 foaming agent Substances 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000008398 formation water Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005325 percolation Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
- E21B43/164—Injecting CO2 or carbonated water
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Lubricants (AREA)
Abstract
The present invention relates to a kind of fine and close oil reservoir CO2Foam is handled up the method improving recovery ratio, and the method is by injecting high pressure CO to post-fracturing fine and close oil reservoir2Slug, now CO2Main full crack, is carried out stewing well, is acted on by extraction, volumetric expansion, dissolving viscosity reduction etc., and crude oil enters crack from substrate；Opening well and making production after well head pressure is stable, CO during stratum filtration2Foaming, CO is contacted with aqueous surfactant solution2Foam flooding, is finally adopted to ground for crude oil from flow in fracture to pit shaft.The method is at CO2In injection process non-foaming, the CO that prevents2Foam by mother oil displacement to oil deposit deep part；And CO when exploiting2Contact with aqueous surfactant solution and can form foam in the earth formation, it is possible to pass through CO2Foam washing oil in crack and effectively control CO2The mechanism such as mobility, so that the more displacement of crude oil in crack is to pit shaft, improve the recovery ratio of fine and close oil reservoir.
Description
Technical field
The present invention relates to a kind of fine and close oil reservoir CO2Foam handle up improve recovery ratio method, belong to oil-gas field development work
Journey technical field.
Background technology
The environmental problem being on the rise promotes people more to pay close attention to CO2Impact on environment, simultaneously also to CO2Trapping skill
Great expectations has been expressed in the development of art.The Chinese government also makes promise: to the CO of the year two thousand twenty per GDP2Discharge capacity is by 2005
On the basis of reduce by 40～45%.Utilize CO2The displacement of reservoir oil is capable of CO2Trap, bury, utilization etc., reduce CO in air2Content.
Fine and close oil refers to preserve the fine and close sand being less than or equal to 0.2mD (air permeability is less than 2mD) at matrix permeability
Oil in the reservoir such as rock, dense carbonate.Fine and close oil reservoir individual well is typically less than work without natural production capacity or natural production capacity
Industry oil flows down limit, but can obtain industry oil production rate under certain economic condition and technical measures.According to preresearch estimates, China is each to be visited
Densification oil stock number in district's is up to (121.5～200) × 108t.In recent years, along with extensive in each fine and close oil district of China of fractured well
Application, obtains obvious development effectiveness, and fine and close oil also becomes the important making & breaking produced in the increasing the storage of Ge You district.And in compact oil reservoir
Fractured well on the one hand dense due to reservoir matrix, fluid is difficult to flow, and causes fractured well yield drastically to decline, Ji Xujin
Row energy supplement；On the other hand due to large-scale artificial fracturing so that great changes will take place in underground percolation field, if carried out note
Water is developed, and injects the water capacity and easily advances by leaps and bounds along crack, injects water and cannot be introduced into matrix pores, thus affects the exploitation effect of fractured well
Really.It is therefore desirable to propose new energy supplement mode for fractured well.But the most both at home and abroad in terms of compact oil reservoir addedly
The process of layer energy is less, causes the mode supplementing energy about fractured well less.
Low-permeability oil deposit CO2Raising single well oil mass of handling up has carried out substantial amounts of desk research and on-the-spot test, result table
Bright, CO2Huff and puff oil recovery can make stripper well strengthening volume increase.But relative to low-permeability oil deposit, the permeability of fine and close oil reservoir is more
Low, fine and close oil matrix and crack heterogeneous body difference are bigger, and blowdown energy reduces very fast, CO2Throughput prediction is limited, needs
Carry out effective fluidity control.If the most single use CO2Handle up and improve the recovery ratio of fine and close oil reservoir, be susceptible to CO2
Has channeling, it is impossible to the effective mobility controlling gas, and the effect of closure transfer drive can not be played, effect is the most obvious.If it is single
Use water drive can only be full of crack and substrate can not be diffused into, it is impossible to carry out the displacement of reservoir oil and gather, waste resource.
Summary of the invention
For the deficiency of existing fine and close oil reservoir exploitation technology, the present invention provides a kind of fine and close oil reservoir CO2Foam is handled up
The method improving recovery ratio.
Summary of the invention:
The method of the present invention is by injecting high pressure CO to post-fracturing fine and close oil reservoir2Slug, now CO2Main being full of is split
Seam, reinjects the aqueous solution slug on a small quantity dissolved with surfactant, CO during injection afterwards2Do not contact with aqueous solution, do not generate bubble
Foam；Injecting and carry out stewing well after aqueous surfactant solution terminates, aqueous solution slug can continue to advance CO2Slug is transported to deep
Move, beneficially CO2Carry out mass transfer diffusion from crack to substrate, acted on by extraction, volumetric expansion, dissolving viscosity reduction etc., crude oil from
Substrate enters crack；Opening well and making production after well head pressure is stable, CO during stratum filtration2Connect with aqueous surfactant solution
Touch and bubble, CO2Foam flooding, is finally adopted to ground for crude oil from flow in fracture to pit shaft.The method is at CO2Injection process does not rises
Bubble, the CO prevented2Foam by mother oil displacement to oil deposit deep part；And CO when exploiting2Contact permissible with aqueous surfactant solution
Form foam in the earth formation, it is possible to pass through CO2Foam washing oil in crack and effectively control CO2The mechanism such as mobility are so that splitting
The more displacement of crude oil in seam, to pit shaft, improves the recovery ratio of fine and close oil reservoir.
Detailed Description Of The Invention:
Technical scheme is as follows:
A kind of fine and close oil reservoir CO2Foam handle up improve recovery ratio method, comprise the following steps that
(1) high pressure CO2Slug injects: by the CO of 0.01PV～0.1PV under reservoir condition2Slug injects densification by pit shaft
Oil reservoir, is full of post-fracturing crack；
(2) aqueous surfactant solution slug injects: by aqueous surfactant solution, injects fine and close oil after being sufficiently mixed
Layer, injects CO under the volume of aqueous solution and the reservoir condition of injection2The ratio of volume is 1:2～1:1, aqueous surfactant solution
Mass concentration 0.1～1.0%；
(3) stewing well diffusion: after aqueous surfactant solution is injected fine and close oil reservoir, carry out stewing well, during the stewing well of record
The change of pressure, CO during stewing well2Carry out mass transfer diffusion from crack to substrate, made by extraction, volumetric expansion, dissolving viscosity reduction
With, crude oil enters crack from substrate；
(4) opening well and making production: opening well and making production after well head pressure is stable, CO during stratum filtration2With surfactant
Aqueous solution contact is bubbled, and effectively controls CO2Mobility, CO2Foam flooding, is finally adopted to ground for crude oil from flow in fracture to pit shaft.
Currently preferred, treat the CO of a round2Foam is handled up after end, repeats step (1)～step (4), carries out
2-5 round is handled up, and improves fine and close oil reservoir oil recovery factor.
Currently preferred, CO2Slug injection rate is 0.03PV～0.08PV.
Currently preferred, in step (2), surfactant is two-(2-ethylhexyl)-sulfonic acid sodium succinate (AOT),
The mass concentration 0.3～0.8% of aqueous surfactant solution.
Currently preferred, in step (2), the volume of aqueous surfactant solution and CO under the reservoir condition of injection2Body
Long-pending ratio is 1:2.
Currently preferred, in step (3), the stewing well time is 5 hours-10 days, it is preferred that the stewing well time is 7 days.
Currently preferred, step (1), CO2Slug is injected fine and close oil reservoir by ground supercharging equipment by pit shaft.
The present invention is at high pressure CO2Until all without CO during stewing well after slug and aqueous surfactant solution slug inject2Bubble
Foam generates, and can effectively prevent the CO that early stage generates2Mother oil displacement to reservoir deep, is caused crude oil to be difficult to exploitation by foam.
The present invention when handling up well opening well and making production, high pressure CO2Contact at crack with aqueous surfactant solution and start to produce
Raw a large amount of foams, both can effectively control CO2Mobility, prevents CO2Has channeling, can increase again CO2The swept volume of foam and washing oil effect
Rate, by the displacement effectively of the crude oil in crack to pit shaft.
It is an advantage of the current invention that:
1, the fine and close oil reservoir CO of the present invention2Foam is handled up and is improved the process of recovery ratio and can effectively solve the problem that fine and close oil
Reservoir water note does not enter substrate and high pressure CO2Has channeling problem, can effectively control supercritical CO2The mobility of fluid, gives full play to CO2
Dissolve the displacement of reservoir oil and the effect of foam washing oil, the recovery ratio of fine and close oil reservoir is greatly improved.
2, the method for the present invention is at high pressure CO2Until stewing well process is equal after slug and aqueous surfactant solution slug inject
Without CO2Foam generates, and can effectively prevent the CO that early stage generates2Mother oil displacement to reservoir deep, is caused crude oil to be difficult to out by foam
Adopt.The CO when handling up well opening well and making production2Contact at crack with aqueous surfactant solution and start to produce a large amount of foam, both can have
Effect controls CO2Mobility, prevents CO2Has channeling, can increase again CO2The swept volume of foam and displacement efficiency, drive the crude oil in crack
For to pit shaft, adopt to ground.
And CO2Foam is handled up and can be passed through CO2Mass transfer diffusion is entered reservoir matrix by crack, both can be the most supplementary
Stratum energy, is possible to prevent again CO2Has channeling, improves mobility ratio, swept volume and displacement efficiency is greatly improved, thus improves crude oil
Recovery ratio.
Accompanying drawing illustrates:
Fig. 1 densification of the present invention oil reservoir CO2Foam is handled up and is improved the schematic diagram of process of recovery ratio, and supercharging equipment is
High pressure CO2Storage tank, prior art.
In figure, 1, high pressure CO2Storage tank；2, ground injection device；3, well is injected；4, foaming agent aqueous solution storage tank；5, level
Well；6, fracturing fracture；7, fine and close oil reservoir.
Fig. 2 is method CO of the present invention2Foam is handled up and prior art CO2Handle up and carry out the CO of 4 rounds2Handle up to adopting
Yield affects block diagram.
Detailed description of the invention
Below in conjunction with some embodiments and Figure of description, the present invention is elaborated, but be not limited to this.
Embodiment 1
A kind of fine and close oil reservoir CO2Foam handle up improve recovery ratio method, flow process is as it is shown in figure 1, include high pressure CO2Storage
Tank 1, at high pressure CO2Storage tank 1 exit is connected with ground injection device 2 by pipeline, connects ground injection device 2 by pipeline
With injection well 3, foaming agent aqueous solution storage tank 4 is connected with ground injection device 2 by pipeline, then is connected with injecting well 3.
Specifically comprise the following steps that
(1) high pressure CO2Slug injection process: by liquid CO of 0.03PV2Slug is injected by pit shaft by ground supercharging equipment
Fine and close oil reservoir, is mainly full of crack；
(2) aqueous surfactant solution slug injection process: by molten for two-(2-ethylhexyl)-sulfonic acid sodium succinate (AOT)
Yu Shuizhong, injects fine and close oil reservoir after being sufficiently mixed, inject the slug volume of aqueous solution and the CO of injection2The ratio of slug volume is 1:
2, surfactant qualities concentration 0.3%；
(3) stewing well diffusion process: after aqueous surfactant solution is injected fine and close oil reservoir, carry out the stewing well of a week, record
The change of pressure during stewing well, CO during stewing well2Spread from crack to substrate, by extraction, volumetric expansion, dissolving viscosity reduction
Deng effect, crude oil enters crack from substrate；
(4) opening well and making production process: after a week, well head pressure no longer reduces, opening well and making production, due to CO2Live with surface on stratum
Property agent aqueous solution contact bubble, can effectively control CO2Mobility, CO2Foam flooding for crude oil from flow in fracture to pit shaft, finally adopt to
Ground；
(5) CO of a round is treated2Foam is handled up after end, and repetition step (1)～step (4) are repeatedly, it is achieved many rounds
CO2Foam is handled up, and fine and close reservoir recovery is greatly improved.
Embodiment 2
Simulation fine and close oil reservoir CO2Foam handles up the experimental provision of displacement crude oil mainly by core holding unit, back-pressure valve, pressure
Power table, high-pressure plunger pump, gas flowmeter, gs-oil separator, gas cylinder, intermediate receptacle, calorstat etc. form, whole experimental simulation
Reservoir condition, is carried out under constant reservoir temperature.
Concretely comprise the following steps:
(1) pour in intermediate receptacle after two-(2-ethylhexyl)-sulfonic acid sodium succinate (AOT) being dissolved in formation water, matter
Amount concentration is 0.3%；
(2) the oil-containing densification oil rock heart pressure break of drilling extracting core is made seam, put into core holding unit, calorstat temperature is adjusted
Joint arrives formation temperature 80 DEG C, more than constant temperature 6h, it is ensured that rock core and crude oil uniformly reach formation temperature；
(3) determine back pressure according to actual formation pressure size, be set to 20MPa；
(4) high pressure CO of 0.05PV is injected by design2Slug, is then injected into the aqueous surfactant solution section of 0.025PV
Plug, closes valve and carries out stewing well, simultaneously pressure changing during the stewing well of record；
(5) stewing well opens inlet valve, record gas production and oil production, and the change of observational record each pressure after 5 hours；
The CO of (6) rounds2Foam is handled up after end, repeats step (1)～step (5) three times, it is achieved 4 rounds
CO2Foam is handled up；
(7) contrast CO2Handle up displacement crude oil, inject the high pressure CO of 0.05PV2, the most do not carry out water filling, close valve and carry out
Stewing well, pressure changing and the oil-producing gas production of opening well and making production during the stewing well of record, be also carried out the CO of 4 rounds simultaneously2
Handle up.
Experimental result is as in figure 2 it is shown, contrast CO2Foam is handled up and CO2Handling up, the former has higher recovery ratio, and 4 gulp down
After telling round, overall recovery factor has reached 20.43%, achieves the effect of preferably exploitation.
Claims (7)
1. a fine and close oil reservoir CO2Foam handle up improve recovery ratio method, comprise the following steps that
(1) high pressure CO2Slug injects: by the CO of 0.01PV～0.1PV under reservoir condition2Slug injects fine and close oil storage by pit shaft
Layer, is full of post-fracturing crack；
(2) aqueous surfactant solution slug injects: by aqueous surfactant solution, injects fine and close oil reservoir, note after being sufficiently mixed
Enter CO under the volume of aqueous solution and the reservoir condition of injection2The ratio of volume is 1:2～1:1, the quality of aqueous surfactant solution
Concentration 0.1～1.0%；
(3) stewing well diffusion: after aqueous surfactant solution is injected fine and close oil reservoir, carry out stewing well, pressure during the stewing well of record
Change, CO during stewing well2Mass transfer diffusion is carried out from crack to substrate, by extraction, volumetric expansion, dissolving viscosity reduction effect,
Crude oil enters crack from substrate；
(4) opening well and making production: opening well and making production after well head pressure is stable, CO during stratum filtration2With aqueous surfactant solution
Contact is bubbled, and effectively controls CO2Mobility, CO2Foam flooding, is finally adopted to ground for crude oil from flow in fracture to pit shaft.
Fine and close oil reservoir CO the most according to claim 12Foam handle up improve recovery ratio method, it is characterised in that treat one
The CO of individual round2Foam is handled up after end, repeats step (1)～step (4), carries out 2-5 round and handle up, and improves fine and close oil reservoir
Oil recovery factor.
Fine and close oil reservoir CO the most according to claim 12Foam handle up improve recovery ratio method, it is characterised in that CO2
Slug injection rate is 0.03PV～0.08PV.
Fine and close oil reservoir CO the most according to claim 12Foam handle up improve recovery ratio method, it is characterised in that step
(2), in, surfactant is two-(2-ethylhexyl)-sulfonic acid sodium succinate (AOT), and the quality of aqueous surfactant solution is dense
Degree 0.3～0.8%.
Fine and close oil reservoir CO the most according to claim 12Foam handle up improve recovery ratio method, it is characterised in that step
(2) in, the volume of aqueous surfactant solution and CO under the reservoir condition of injection2The ratio of volume is 1:2.
Fine and close oil reservoir CO the most according to claim 12Foam handle up improve recovery ratio method, it is characterised in that step
(3), in, the stewing well time is 5 hours-10 days.
Fine and close oil reservoir CO the most according to claim 62Foam handle up improve recovery ratio method, it is characterised in that step
(3), in, the stewing well time is 7 days.
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| CN106545322A (en) * | 2015-09-21 | 2017-03-29 | 中国石油天然气股份有限公司 | Squeezing liquid pretreatment method of SAGD shaft |
| CN106869878A (en) * | 2017-04-28 | 2017-06-20 | 淄博瑞特石油技术有限公司 | A kind of CO_2 stimulation construction method for oil well |
| CN108424760A (en) * | 2018-04-23 | 2018-08-21 | 中国石油大学(华东) | A kind of CO being suitable for fine and close oily reservoir2Sensitive pressure break-row's displacement system and the preparation method and application thereof method |
| CN108457629A (en) * | 2018-02-02 | 2018-08-28 | 中国石油大学(华东) | A kind of method that CO_2 stimulation turns the fine and close oil of drive exploitation |
| CN108661614A (en) * | 2017-03-30 | 2018-10-16 | 中国石油天然气股份有限公司 | Dense oil reservoir supercritical CO2Huff and puff oil recovery method |
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| CN108868716A (en) * | 2017-05-10 | 2018-11-23 | 中国石油天然气股份有限公司 | For evaluating CO2System and method for displacement effect of emulsion on oil reservoir |
| CN109386261A (en) * | 2017-08-10 | 2019-02-26 | 中国石油天然气股份有限公司 | Method and system for improving recovery ratio of tight oil reservoir |
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