CN106958437B - A kind of wellfracturing raising recovery ratio new method - Google Patents
A kind of wellfracturing raising recovery ratio new method Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000011084 recovery Methods 0.000 title claims abstract description 18
- 239000012530 fluid Substances 0.000 claims abstract description 58
- 238000010276 construction Methods 0.000 claims abstract description 37
- 239000007924 injection Substances 0.000 claims abstract description 26
- 238000002347 injection Methods 0.000 claims abstract description 26
- 238000003825 pressing Methods 0.000 claims abstract description 25
- 238000006073 displacement reaction Methods 0.000 claims abstract description 22
- 238000004519 manufacturing process Methods 0.000 claims abstract description 17
- 238000013461 design Methods 0.000 claims abstract description 8
- 239000003129 oil well Substances 0.000 claims abstract description 8
- 239000000203 mixture Substances 0.000 claims abstract description 7
- 230000000704 physical effect Effects 0.000 claims abstract description 5
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 4
- 229920000642 polymer Polymers 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 239000000243 solution Substances 0.000 claims description 9
- 238000005516 engineering process Methods 0.000 claims description 6
- 239000004094 surface-active agent Substances 0.000 claims description 5
- 229910002056 binary alloy Inorganic materials 0.000 claims description 4
- 150000001875 compounds Chemical class 0.000 claims description 4
- 239000003513 alkali Substances 0.000 claims description 2
- 239000012190 activator Substances 0.000 claims 1
- 230000008569 process Effects 0.000 abstract description 10
- 230000001965 increasing effect Effects 0.000 abstract description 9
- 238000011161 development Methods 0.000 abstract description 7
- 230000009699 differential effect Effects 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 28
- 239000011435 rock Substances 0.000 description 19
- 230000000694 effects Effects 0.000 description 12
- 239000011229 interlayer Substances 0.000 description 10
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 10
- 239000004810 polytetrafluoroethylene Substances 0.000 description 10
- 238000004088 simulation Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 8
- 238000002474 experimental method Methods 0.000 description 7
- 239000007788 liquid Substances 0.000 description 6
- -1 polytetrafluoroethylene Polymers 0.000 description 5
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 description 4
- 239000010779 crude oil Substances 0.000 description 4
- 239000004033 plastic Substances 0.000 description 4
- 229920003023 plastic Polymers 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 230000035515 penetration Effects 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 239000006004 Quartz sand Substances 0.000 description 2
- 229910001870 ammonium persulfate Inorganic materials 0.000 description 2
- 230000003321 amplification Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000003431 cross linking reagent Substances 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000013401 experimental design Methods 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 239000004971 Cross linker Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
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- 230000000903 blocking effect Effects 0.000 description 1
- 238000010835 comparative analysis Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 229920002401 polyacrylamide Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
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- 239000000843 powder Substances 0.000 description 1
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Classifications
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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
-
- 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
- E21B43/267—Methods for stimulating production by forming crevices or fractures reinforcing fractures by propping
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
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- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Working Measures On Existing Buildindgs (AREA)
Abstract
The invention belongs to oil field development technical fields, and in particular to a kind of wellfracturing raising recovery ratio new method.This method are as follows: 1, pressing crack construction well and fractured layer position chosen according to actual reservoir physical property and characteristic of production dynamic；2, type, injection rate and the injection discharge capacity and the type of fracturing fluid, composition, injection rate and injection discharge capacity of preposition displacing fluid are determined according to reservoir properties, formation fracture pressure value and scope of construction item；3, under conditions of being lower than reservoir fracture pressure, preposition displacing fluid is injected to reservoir according to design construction parameter；4, after having infused preposition displacing fluid, pressing crack construction is carried out according to design construction parameter injection fracturing fluid；5, after the completion of pressing crack construction, subsequent opening well and making production is carried out, and monitors oil well production dynamic.Displacement process forms high oil saturation region in reservoir, enhances oily phase fluid ability, is increased under producing pressure differential effect by the oil mass that crack near wall flows into crack after pressing crack construction, be finally reached and improve recovery ratio purpose.
Description
Technical field:
The invention belongs to oil field development technical fields, and in particular to a kind of wellfracturing raising recovery ratio new method.
Background technique:
Formation fracturing is a kind of important yield-increasing technology that reservoir properties are transformed, improve effect of reservoir development, in reservoir rock
Physical property is widely used in poor oil field.In conventional fracturing process, usually first prepad fluid huge discharge is injected, injection is caused to press
Power increases rapidly, and when injection pressure is greater than reservoir rock fracture pressure, reservoir ruptures, and subsequent process is injected separately into takes again
Sand liquid and displacement fluid are finally completed entire pressing crack construction.In practical fracturing process, to reduce fracturing fluid dosage and reducing medicament expense
With, usually require that fracturing fluid have good wave making machine, i.e., fracture faces formed temporarily blocking layer, to reduce filter loss.So often
Fracture near wall oil phase displacement effect is weaker in rule fracturing process, it is difficult to which in crack, near wall and crack leading edge are formed
High oil-containing region.Pressing crack construction terminates after starting production, and nearby reservoir Crude Oil passes through crack under producing pressure differential effect to the borehole wall
Oil well is flowed into, but effectively involved by reservoir properties difference and subsequent displacement fluid the factors such as be limited in scope to be influenced, relies primarily on production
Differential pressure action is difficult to that reservoir oil saturation is caused to reduce by a relatively large margin, therefore conventional pressing crack construction face is generally faced with production and sees
The problem that effect is fast but the period that takes effect is shorter.
Summary of the invention:
It is difficult to solve existing conventional oil well fracturing technology in place of the present invention makes up and improve above-mentioned the deficiencies in the prior art
To employ near wellbore zone crude oil, production reduces the problem that the period is short and oil increasing effect is limited, devises a kind of wellfracturing raising
Recovery ratio method, this method propose the new processes of " pressure break after first displacement " instead of conventional direct fracturing technology, preposition displacement
Process can improve in nearly well reservoir while being driven to the near wellbore zone crude oil for being difficult to employ in conventional exploitation close to injection well
Oily phase fluid ability is conducive to improve the production effect after pressing crack construction, is finally reached and improves recovery ratio purpose.(technical principle
Schematic diagram is shown in Fig. 1)
The technical solution adopted by the present invention are as follows: a kind of wellfracturing raising recovery ratio new method, the construction technology of this method
Are as follows:
Step 1: choosing pressing crack construction well and fractured layer position according to actual reservoir physical property and characteristic of production dynamic；
Step 2: determining type, the injection of preposition displacing fluid according to reservoir properties, formation fracture pressure value and scope of construction item
Amount and injection discharge capacity and the type of fracturing fluid, composition, injection rate and injection discharge capacity；
Step 3: injecting preposition displacement to reservoir according to design construction parameter under conditions of being lower than reservoir fracture pressure
Liquid；
Step 4: carrying out pressing crack construction according to design construction parameter injection fracturing fluid after having infused preposition displacing fluid；
Step 5: carrying out subsequent opening well and making production after the completion of pressing crack construction, and monitor oil well production dynamic.
The type of the fracturing fluid includes the type of prepad fluid, load fluid and displacement fluid, and the composition of fracturing fluid includes preposition
The composition ratio of liquid, load fluid and displacement fluid.
The type of the preposition displacing fluid is selected for practical pressure break reservoir properties, oil displacement system include clear water,
Surfactant solution, general polymer solution, binary system and ternary system, wherein binary system is that polymer/surface is living
Property agent compound system, ternary system be alkali/Surfactant/Polymer compound system.
The preposition displacing fluid injection rate is designed for practical pressure break scale and reservoir properties.
The type and injection rate of the fracturing fluid are designed for practical pressure break scale and reservoir properties.
Beneficial effects of the present invention: compared with the direct pressing crack construction technique of existing routine, of the invention " presses after first displacement
Split " on the one hand the preposition displacement process in new process can will be difficult to the near wellbore zone employed original in conventional exploitation before pressing crack construction
Oil is driven to close to injection well, and be conducive to expansion subsequent production process displacement fluid effectively involves range；Another aspect displacement stream
Journey forms high oil saturation region in reservoir, enhances oily phase fluid ability, acts on after pressing crack construction in producing pressure differential
Under increased by the oil mass that crack near wall flows into crack, both sides comprehensive function can effectively improve the life after pressing crack construction
Effect is produced, is finally reached and improves recovery ratio purpose.
Detailed description of the invention:
Fig. 1 is technical principle schematic diagram of the invention.
Fig. 2 is the rock core structure schematic diagram in the embodiment of the present invention one.
Fig. 3 is the displacement equipment flowsheet schematic diagram in the present invention in embodiment one.
Fig. 4 is the inverted nine-spot pattern schematic diagram in the embodiment of the present invention two.
Fig. 5 is the geological model schematic diagram in the embodiment of the present invention two.
Specific embodiment: it since practical reservoir media is complicated and reservoir properties are because development stimulation difference has differences, presses
It splits the more difficult similar block of physical property height that finds in work progress and carries out construction effect comparative evaluation.In recent years, oil reservoir physics mould
Quasi- and numerical simulation technology plays important function in Development Response of Oilfield research process, therefore the present invention uses physical analogy
Experiment and numerical simulation carry out specific implementation Contrast on effect.
Embodiment one
Pressing crack construction technological effect physical analogy evaluation is carried out using quartz sand epoxy resin cementitious artificial homogeneous rock core.
1, experimental material
Preposition displacing fluid is polymer solution (mass fraction 0.1%) and fracturing fluid is polymer gel fracturing fluid (0.13%
+ 0.4% ammonium persulfate of+0.12% cleanup additive+2.0%DZ-2 crosslinking agent of polymer).Polymer is production department, Daqing Refinery company
Divide hydrolyzed polyacrylamide dry powder (HPAM), relative molecular mass is respectively M=1900 × 104, effective content 88.0%；The row of helping
Agent is that Daqing High-tech Park Hualongxiang Chemical Co., Ltd. produces nonionic surface active agent, and crosslinking agent is organic chrome cross linker,
Gel breaker is ammonium persulfate.
Experimental water is that fracturing fluid used in Daqing oil field site operation prepares water.Experiment is simulation oil with oil, by Daqing oil
Field crude oil is mixed with lighter hydrocarbons, and viscosity is 9.8mPas under the conditions of 45 DEG C.
Experiment crack rock core is quartz sand epoxy resin cementitious homogeneous rock core, by two pieces of appearance geometric dimensions: high × wide ×
Length=2.25cm × 4.5cm × 60cm composition, core permeability Kg=150 × 10-3μm2, structural schematic diagram is shown in Fig. 2.
2, instrument and equipment
Experimental facilities mainly includes ISCO pump, pressure sensor, core holding unit, hand pump and intermediate receptacle etc., is removed
Outside ISCO pump and hand pump, other parts are placed in the insulating box at 45 DEG C of experimental temperature, and equipment and flow diagram are shown in Fig. 3, note
Flow quantity is 0.3mL/min, and data recording time interval is 30min.
3, experimental method
1), claim two blocks of rock cores to dry weight, evacuate saturation experiments water, claim weight in wet base, calculate pore volume；
2), two blocks of rock cores are merged, centre is put into plastic interlayer, and with outside polytetrafluoroethylene (PTFE) adhesive tape winding rock core
Portion (except end face) makes it remain an entirety.Then rock core is put into core holding unit, is satisfied under the conditions of reservoir temperature
And simulation oil.Rock core is stood for 24 hours later, calculates oil saturation；
3), water drive collects different mining phase Discharge rates in production end, calculates moisture content and recovery ratio to aqueous 95%.
4), " pressure break after first displacement ": from injection end with 0.3mL/min injection rate inject 6mL polymer solution after, by rock
The heart takes out from clamper, removes polytetrafluoroethylene (PTFE) unsintered tape and plastic central interlayer outside rock core.According to experimental design crack
Penetration ratio, plastic interlayer is reentered among rock core, and (interlayer is interlayer with seam, and segment length with seam is fracture length 1/4 and twines
Around polytetrafluoroethylene (PTFE) unsintered tape, it is then placed in core holding unit.Fracturing fluid is injected under 2MPa pressure difference, fracturing fluid is along exposure crack
Wall leak-off, and region remaining oil will be flowed through and push rock core deep to.Produced Liquid is collected, filter loss is calculated；
" direct pressure break ": rock core is taken out from clamper, removes polytetrafluoroethylene (PTFE) unsintered tape and intermediate modeling outside rock core
Expect interlayer.According to experimental design crack penetration ratio, plastic interlayer is reentered among rock core, and (interlayer is interlayer with seam, with seam
Segment length is fracture length 1/4 and winding polytetrafluoroethylene (PTFE) unsintered tape, is then placed in core holding unit.It is injected under 2MPa pressure difference
Fracturing fluid, fracturing fluid will flow through region remaining oil and push rock core deep to along exposure sides of fracture leak-off.Produced Liquid is collected, is calculated
Filter loss；
5) it, repeats in above-mentioned experimental procedure 4 results of fracture simulation technique 3 times, increases interlayer segment length with seam every time, value added is
Fracture length 1/4.
6), subsequent waterflooding records different time sections liquid outlet quantity and oil pump capacity, calculates recovery ratio to aqueous 95%.
4, experimental result
Different pressing crack construction technique oil increasing effects influence experimental result and are shown in Table 1.
Table 1: recovery ratio experimental result
From table 1 it follows that increasing after " pressure break after first displacement " technique pressing crack construction compared with " direct pressure break " technique
Oily effect is more preferable.
Embodiment two
Numerical model is established using CMG software and carries out the evaluation of pressing crack construction technological effect numerical simulation.
1, experiment condition
Fracturing fluid type is carried out to pressing crack construction influential effect numerical simulation study using ideal model.The practical well pattern of mining site
For inverted nine-spot pattern, its 1/4(1 mouthfuls of injection well, 3 mouthfuls of producing wells are intercepted) geological model is established, see Fig. 4.According to practical oil reservoir feelings
Condition, the reservoir top depth that designs a model are 900m, and small thickness 4m, porosity 0.23, oil-water interfaces depth is 909m.Model water
Square to size of mesh opening be 5m × 5m, the minimum 0.01m of size of mesh opening at crack on longitudinal direction, from crack to two sides size of mesh opening by
1m is gradually increased to, sees Fig. 5.It is 11MPa that initial pressure at 900 meters, which is arranged, initially executes gravity-hollow billet without gas and oil hiding to one
Dynamic balance initialization calculates.Ideal model is initialized according to gravity-hollow billet dynamic balance, irreducible water saturation is
0.3257.When well spacing is 150m and permeability is Kg=150 × 10-3μm2When, oil in place is 1.410 × 104m3。
2, conceptual design
Injection well (INJECTOR) carries out level pressure (13MPa) waterflooding development in target well group, when oil well comprehensive water cut reaches
When 60%, pressure break is carried out to 3 mouthfuls of oil wells (PROD1, PROD2 and PROD3) of the well group.After pressing crack construction, well group continues to implement level pressure
(13MPa) waterflooding development adds up oil increment and recovery ratio after calculating target well group pressing crack construction in 2 years.
In producer-injector spacing, reservoir mean permeability, time for fracturing (water ratio in oil well when pressure break) and crack penetration ratio etc.
Under parameter value rigid condition, " direct pressure break " (fracturing fluid is polymer gel fracturing fluid) and " pressure break after first displacement " are compared respectively
(preposed attributives are polymer solution, and fracturing fluid is polymer gel fracturing fluid) two kinds of technique numerical simulation oil increasing effects, polymerization
Object solution, fracturing fluid property are consistent with 1 physical simulation experiment of example.
3, interpretation of result
Pressure break mode influences numerical simulation result to target well group polymer pressure break oil increasing effect and is shown in Table 2.
Table 2: pressure break oil increasing effect
From table 2 it can be seen that pressure break leak-off mode is different, recovery ratio amplification is different, compared with " direct pressure break " mode,
The recovery ratio amplification of " pressure break after first displacement " mode is higher.
The foregoing is merely case embodiments of the invention, are not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (3)
1. a kind of wellfracturing improves recovery ratio new method, it is characterised in that: the construction technology of this method are as follows:
Step 1: choosing pressing crack construction well and fractured layer position according to actual reservoir physical property and characteristic of production dynamic；
Step 2: according to reservoir properties, formation fracture pressure value and scope of construction item determine the type of preposition displacing fluid, injection rate and
Inject type, composition, injection rate and the injection discharge capacity of discharge capacity and fracturing fluid；
Step 3: injecting preposition displacing fluid to reservoir according to design construction parameter under conditions of being lower than reservoir fracture pressure；
Step 4: carrying out pressing crack construction according to design construction parameter injection fracturing fluid after having infused preposition displacing fluid；
Step 5: carrying out subsequent opening well and making production after the completion of pressing crack construction, and monitor oil well production dynamic；
The type of the preposition displacing fluid is selected for practical pressure break reservoir properties, and oil displacement system includes clear water, surface
Activator solution, general polymer solution, binary system and ternary system, wherein binary system is polymer/surfactant
Compound system, ternary system are alkali/Surfactant/Polymer compound system；
The injection rate of the preposition displacing fluid is designed for practical pressure break scale and reservoir properties.
2. a kind of wellfracturing according to claim 1 improves recovery ratio new method, it is characterised in that: the fracturing fluid
Type includes the type of prepad fluid, load fluid and displacement fluid, and the composition of fracturing fluid includes the group of prepad fluid, load fluid and displacement fluid
It is proportional.
3. a kind of wellfracturing according to claim 1 improves recovery ratio new method, it is characterised in that: the fracturing fluid
Type and injection rate be designed for practical pressure break scale and reservoir properties.
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| CN109594959B (en) * | 2018-10-31 | 2021-02-05 | 东北石油大学 | Fracturing oil displacement method for improving recovery economic efficiency of thin and poor reservoir of old oil field |
| CN113187458B (en) * | 2021-05-31 | 2023-05-12 | 新疆正通石油天然气股份有限公司 | Method for injecting oil displacement agent into oil layer by using fracturing pad fluid to improve recovery ratio |
| CN114324073B (en) * | 2021-11-22 | 2024-04-30 | 中国石油天然气股份有限公司 | Screening method and application of porous medium oil displacement system |
| CN117468908A (en) * | 2023-12-04 | 2024-01-30 | 东北石油大学 | Novel method for improving recovery ratio of pressure flooding of medium-low permeability reservoir |
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|---|---|---|---|---|
| US4017119A (en) * | 1976-03-25 | 1977-04-12 | The United States Of America As Represented By The United States Energy Research And Development Administration | Method for rubblizing an oil shale deposit for in situ retorting |
| CN1291253A (en) * | 1998-04-06 | 2001-04-11 | 大庆石油管理局 | Foam compsoite oil drive method |
| CN102587880A (en) * | 2012-03-05 | 2012-07-18 | 中国石油天然气股份有限公司 | Oil extraction method |
| WO2013163645A1 (en) * | 2012-04-27 | 2013-10-31 | The Trustees Of Columbia University In The City Of New York | Methods and systems for causing reaction driven cracking in subsurface rock formations |
| CN103615228A (en) * | 2013-11-26 | 2014-03-05 | 中国石油天然气股份有限公司 | Temporary plugging and fracturing process in degradable fiber clearance |
| CN103939078A (en) * | 2014-03-27 | 2014-07-23 | 上海井拓石油开发技术有限公司 | Equal-fluidity fuel scavenge and fracturing integrated technology |
| CN104790928A (en) * | 2015-04-07 | 2015-07-22 | 东北石油大学 | Method for increasing crude oil recovery ratio of post-polymer flooding slug combination system |
| CN106246150A (en) * | 2016-09-18 | 2016-12-21 | 中国石油天然气股份有限公司 | A kind of oil field compression fracture remodeling method |
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2017
- 2017-05-16 CN CN201710342086.XA patent/CN106958437B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4017119A (en) * | 1976-03-25 | 1977-04-12 | The United States Of America As Represented By The United States Energy Research And Development Administration | Method for rubblizing an oil shale deposit for in situ retorting |
| CN1291253A (en) * | 1998-04-06 | 2001-04-11 | 大庆石油管理局 | Foam compsoite oil drive method |
| CN102587880A (en) * | 2012-03-05 | 2012-07-18 | 中国石油天然气股份有限公司 | Oil extraction method |
| WO2013163645A1 (en) * | 2012-04-27 | 2013-10-31 | The Trustees Of Columbia University In The City Of New York | Methods and systems for causing reaction driven cracking in subsurface rock formations |
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