CN104806195A - Profile control and displacement method and system for selectably acting and thickening thin oil - Google Patents
Profile control and displacement method and system for selectably acting and thickening thin oil Download PDFInfo
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- CN104806195A CN104806195A CN201510111988.3A CN201510111988A CN104806195A CN 104806195 A CN104806195 A CN 104806195A CN 201510111988 A CN201510111988 A CN 201510111988A CN 104806195 A CN104806195 A CN 104806195A
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- 230000008719 thickening Effects 0.000 title abstract description 7
- 238000011549 displacement method Methods 0.000 title abstract 4
- 239000003921 oil Substances 0.000 claims abstract description 89
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 76
- 238000012546 transfer Methods 0.000 claims abstract description 67
- 238000002347 injection Methods 0.000 claims abstract description 61
- 239000007924 injection Substances 0.000 claims abstract description 61
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 52
- 239000007788 liquid Substances 0.000 claims abstract description 48
- 238000000034 method Methods 0.000 claims abstract description 31
- 239000010779 crude oil Substances 0.000 claims abstract description 10
- 230000000694 effects Effects 0.000 claims description 25
- 238000002360 preparation method Methods 0.000 claims description 9
- 239000012752 auxiliary agent Substances 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 7
- 239000002562 thickening agent Substances 0.000 claims description 7
- 238000003756 stirring Methods 0.000 claims description 6
- 238000011049 filling Methods 0.000 claims description 4
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 3
- 230000009467 reduction Effects 0.000 claims description 3
- 238000006073 displacement reaction Methods 0.000 abstract description 14
- 238000005516 engineering process Methods 0.000 abstract description 10
- 230000008569 process Effects 0.000 abstract description 9
- 238000011084 recovery Methods 0.000 abstract description 5
- 230000015572 biosynthetic process Effects 0.000 abstract description 4
- 239000008398 formation water Substances 0.000 abstract description 3
- 230000005012 migration Effects 0.000 abstract description 3
- 238000013508 migration Methods 0.000 abstract description 3
- 238000003860 storage Methods 0.000 description 21
- 238000004891 communication Methods 0.000 description 14
- 239000003431 cross linking reagent Substances 0.000 description 11
- 238000010586 diagram Methods 0.000 description 10
- 229920000642 polymer Polymers 0.000 description 10
- 239000000463 material Substances 0.000 description 9
- 239000010410 layer Substances 0.000 description 7
- 239000000843 powder Substances 0.000 description 7
- 238000011161 development Methods 0.000 description 6
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- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- 239000000499 gel Substances 0.000 description 4
- 239000003129 oil well Substances 0.000 description 4
- 239000000049 pigment Substances 0.000 description 4
- 238000005070 sampling Methods 0.000 description 4
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 3
- 240000002853 Nelumbo nucifera Species 0.000 description 3
- 239000006260 foam Substances 0.000 description 3
- 102100038591 Endothelial cell-selective adhesion molecule Human genes 0.000 description 2
- 101000882622 Homo sapiens Endothelial cell-selective adhesion molecule Proteins 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 238000005187 foaming Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
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- 230000037361 pathway Effects 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 102100036285 25-hydroxyvitamin D-1 alpha hydroxylase, mitochondrial Human genes 0.000 description 1
- 101000875403 Homo sapiens 25-hydroxyvitamin D-1 alpha hydroxylase, mitochondrial Proteins 0.000 description 1
- 101100489713 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) GND1 gene Proteins 0.000 description 1
- 101100489717 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) GND2 gene Proteins 0.000 description 1
- 241000009298 Trigla lyra Species 0.000 description 1
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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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
-
- 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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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- 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)
Abstract
The invention provides a profile control and displacement method and system for selectably acting and thickening thin oil. The profile control and displacement method comprises the steps of 1 using clear water to clean a water injection well, 2 preparing liquid for deep profile control and displacement, 3 injecting the liquid for deep profile control and displacement into the water injection well, 4 rapidly improving the viscosity of the moisture content in the profile control and displacement agent and achieving the deep profile control and displacement purpose in a far well region after the liquid for deep profile control and displacement is stopped and when the moisture content in the profile control and displacement agent is higher than 40%. The profile control and displacement method is a profile control and displacement technology enabling field operation to be simple and convenient achieving selective plugging. The thickening thin oil profile control and displacement agent is evenly mixed on the ground and is injected into the water injection well, the profile control and displacement agent is in contact with formation water in the formation transfer process, the viscosity is gradually increased, the profile control and displacement agent can effectively plug a preferential migration passage and a high-permeability layer after entering the deep portion of an oil reservoir, enables follow-up liquid to be turned, sweep efficiency is improved, and further crude oil recovery rate is improved.
Description
Technical field
The present invention relates to geophysics field, improving oil recovery rate technology specifically by surveying, particularly a kind of alternative effect multiviscosisty thin oil transfer drive method and system for oil field.
Background technology
In water flooding process, due to the non-homogeneity on stratum, when injection water is after oil well is broken through, cause channelling and stream phenomenon seriously, sweep efficiency is low, waterflooding development interlayer, layer are interior, horizontal contradiction is given prominence to, make produced liquid in oil well moisture content sharply increase, development effectiveness is deteriorated, and not only affects waterflood efficiency, and cause series of negative to affect on the protection of Produced Liquid process and gathering line, drastically influence development cost.For solving the problem, transfer drive technology obtains in oil field development extensively to be paid attention to and development.
Transfer drive technology mainly changes oil deposit deep part liquid flow path direction, expands swept volume, improves oil displacement efficiency.The profile control agent kind of application is a lot of at present both at home and abroad, comprise: viscoplasticity Weak Gels class (Wang Hongguan etc. a kind of viscoelastic weak gel profile control agent CN101712865A), foam class (Li Zhaomin etc. foam profile agent, oil displacement system and flooding method CN101314710), profile control agent microballoon class (Zhou Ming etc. a kind of hud typed profile control agent microballoon profile control agent and preparation method CN102504793A) etc. profile control agent, but at the scene application in there is following shortcoming or deficiency:
(1) viscoplasticity Weak Gels class profile control agent gelation time is short, easily forms shutoff near wellbore zone, cannot reach transfer drive object.There is the problems such as foaming under wayward, the formation condition of foaming is difficult in foam class profile control agent.It is weak to there is transfer drive ability in profile control agent microballoon class profile control agent, is not suitable for high hole, height oozes the limitation problems such as reservoir.
(2) profile control agent injected all can not realize selective shut-off to oil-water-layer, i.e. water blockoff and stifled oil, but general by oil-water-layer together shutoff, causes part potentiality oil reservoir to start production.
(3) inject behind stratum cannot recycling for profile control agent, if oil well produced, also needs to take particular form to process, result in transfer drive financial cost high with running cost.
Therefore, develop and a kind ofly do not injure reservoir, there is selective shut-off, the low cost transfer drive method of recyclable recycling, recovery ratio is improved to water filling old filed significant.
Summary of the invention
The object of the present invention is to provide a kind of alternative effect multiviscosisty thin oil transfer drive method and system for oil field, it is the transfer drive technology of easy, the alternative shutoff of a kind of execute-in-place.By multiviscosisty thin oil profile control agent is mixed on ground, inject water injection well, profile control agent contacts with formation water in the migration process of stratum, viscosity increases gradually, entering after oil deposit deep part can effectively shutoff predominant pathway, high permeability zone, make follow-up fluid diversion, expand sweep efficiency, and then improve oil recovery factor.
According to a first aspect of the present invention, provide a kind of alternative effect multiviscosisty thin oil transfer drive method, it comprises the following steps:
The first step: use clean water water injection well;
Second step: preparation transfer drive liquid;
3rd step: the transfer drive liquid of above-mentioned preparation is injected water injection well;
4th step: after transfer drive liquid stops note, when moisture content reaches more than 40% in profile control agent, profile control agent viscosity increases sharply, and plays the object of transfer drive in well area far away.
Wherein, in a first step, at original annotation well waterflood injection rate, (waterflood injection rate is 50-80m to the injection rate of clear water
3/ d) increase by 10% on basis, injection pressure increases and is no more than 5% on original annotation well injection pressure basis.
In second step, be less than 1% to moisture content, viscosity is less than in the dewatered oil of 50mPa.s and adds 0.9% thickening agent, 0.1% auxiliary agent successively according to weight ratio, all the other 99% compositions are crude oil, stir 1 hour, make it mix, be mixed with multiviscosisty thin oil profile control agent.
In the third step, injection mode is, at original annotation well waterflood injection rate, (waterflood injection rate is 50-80m to the injection rate of transfer drive liquid
3/ d) reduction by 10% on basis, injection rate is 0.01-0.05 times of reservoir pore space volume, when injection liquid pressure exceedes stratum reset pressure, stops injecting transfer drive liquid.
In the 4th step, Injection Well recovers original annotation water, and according to original annotation water speed, (waterflood injection rate is 50-80m
3/ d) start water filling, along with injection water contacts with thickened oil profile control agent, profile control agent is moisture to be increased gradually, and when in profile control agent, moisture content reaches more than 40%, profile control agent viscosity increases sharply, and plays the object of transfer drive in well area far away.
Wherein, the profile control agent in the present invention is made up of the thin oil that dewaters, thickening agent and auxiliary agent; Said method is applicable to waterflooding oil field multiviscosisty thin oil transfer drive.
According to a second aspect of the present invention, the invention provides a kind of for multiviscosisty thin oil transfer drive system, realize alternative effect multiviscosisty thin oil transfer drive method.This system mainly comprises: cementing truck (volume 50m
3, belt stirrer), tri-plunger high pressure pump (discharge capacity 3-5m
3/ h, operating pressure 8-16MPa), frequency-variable controller (out-put supply frequency 25-400Hz, adjustable), electromagnetic flowmeter (measurement category 30:1), high pressure line (withstand voltage 20MPa).
According to a third aspect of the present invention, the invention provides a kind of alternative effect multiviscosisty thin oil transfer drive system, realize alternative effect multiviscosisty thin oil transfer drive method.This system comprises reciprocating pump, intelligence control system, automatic charging device, agitator tank and blind controller system;
Wherein, reciprocating pump is Double-cylinder single-acting reciprocating pump, and plunger motion speed is slow, and the shearing caused profile control agent is very little, variable-frequency electric acc power is 75Kw, and discharge capacity can be controlled in 6-15m3/h, and maximum working pressure can reach 30MPa, overall mass 10t, mounting means is skid-mounted type, is convenient to resettlement.In addition, because plunger motion speed is slow, wear and tear little, so the time between overhauls(TBO) is very long, the cycle of operation on average can reach more than 60d;
(2) intelligence control system.Intelligence control system is made up of auto-control software, Industrial Personal Computer (IPC), AD/DA analog-digital converter, address card, flow meter, pressure gauge, liquid level feedback system, wireless transport module etc., whole system " heart ", all other parts switches and regulating command, sent after all also being analyzed by image data by it.The pressure and other parameters of the instantaneous delivery in work progress reaches system interface by wireless transmitting system, and operating personnel directly read by intelligence control system and adjust, and constructability personnel grasp well head at any time and inject situation;
(3) automatic charging device.Profile control agent powder is fallen people and promotes in hopper by automatic charging device, material powder is delivered to tapered hopper by screw elevator, material in tapered hopper, through screw feeder, venturi-type eductors, electrical ball valve, pigment mixing head, is handled by powertrain system and is delivered to solution agitator tank;
(4) agitator tank.Water from water pot injects agitator tank, tentatively mixes at pigment mixing head with the supplied materials of automatical feeding system, enters in tank and fully stirs.Agitator tank is furnished with ultrasonic level gage, and can carry out Real-Time Monitoring to liquid level, signal reaches intelligence control system, has warning and automatic stopping function;
(5) blind controller system.Be made up of elements such as electromagnetic valve, frequency converter, multiple contactor, air switch, relays, complete equipment can realize chain automatic control and Non-follow control, can carry out in intelligence control system when controlling liquid level, flow and pressure, also manually can carry out between instrument controls.
The present invention compared with prior art, has following advantage:
(1) multiviscosisty thin oil transfer drive method is different from gel-like transfer drive, can avoid because plastic is too fast and only play near wellbore zone
Effect, this profile control agent only has viscosity after contact with water just to increase gradually after injecting stratum, is therefore easier to migrate to earth formation deep, and the distance playing profile control effect is farther.
(2) multiviscosisty thin oil profile control agent has chance water thickening, meets oil not thickening feature, dissolves each other, play displacement effect at oil reservoir and underground crude oil; At the alternative shutoff water layer of water layer, can flow after pressurization, by a relatively large margin suggestions for improvement.
(3) crude oil is applied as primary raw material, at oil field Raw wide material sources, and good with oil reservoir compatibility, to reservoir fanout free region, pollution-free.
(4) profile control agent main component is crude oil, injects behind stratum, along with oil field is continually developed, also can back production out, recycle, Produced Liquid does not need specially treated simultaneously, significantly reduces financial cost.
Accompanying drawing explanation
Fig. 1 is according to multiviscosisty thin oil transfer drive liquid system of the present invention;
Fig. 2 is on-the-spot profile control agent injection rate and pressure history;
Fig. 3 is on-the-spot profile control agent control system schematic diagram;
Fig. 4 is the structured flowchart of the programmable control system in on-the-spot profile control agent control system;
Fig. 5 is the electrical block diagram of the programmable control system in on-the-spot profile control agent control system;
Fig. 6 is the storage chip circuit theory diagrams of the programmable control system in on-the-spot profile control agent control system;
Fig. 7 is the magnetic coupling buffer circuit schematic diagram of the programmable control system in on-the-spot profile control agent control system.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only a part of embodiment of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.Additionally, protection scope of the present invention only should be limited to following concrete structure or parts or design parameter.
Alternative effect multiviscosisty thin oil transfer drive technology is the transfer drive technology of easy, the alternative shutoff of a kind of execute-in-place.Multiviscosisty thin oil profile control agent is mixed on ground, inject water injection well, profile control agent contacts with formation water in the migration process of stratum, viscosity increases gradually, entering after oil deposit deep part can effectively shutoff predominant pathway, high permeability zone, make follow-up fluid diversion, expand sweep efficiency, improve a kind of technology of oil recovery factor.
Profile control agent in the present invention is made up of the thin oil that dewaters, thickening agent and auxiliary agent, and above-mentioned to be applicable to waterflooding oil field multiviscosisty thin oil transfer drive method as follows:
The first step: use clean water water injection well, at original annotation well waterflood injection rate, (waterflood injection rate is 50-80m to the injection rate of clear water
3/ d) increase by 10% on basis, injection pressure increases and is no more than 5% on original annotation well injection pressure basis.
Second step: preparation transfer drive liquid, be less than 1% to moisture content, viscosity is less than in the dewatered oil of 50mPa.s and adds 0.9% thickening agent, 0.1% auxiliary agent successively according to weight ratio, all the other 99% compositions are crude oil, stir 1 hour, make it mix, be mixed with multiviscosisty thin oil profile control agent.
3rd step: the transfer drive liquid of above-mentioned preparation is injected water injection well, and injection mode is, (waterflood injection rate is 50-80m to the injection rate of transfer drive liquid at original annotation well waterflood injection rate
3/ d) reduction by 10% on basis, injection rate is 0.01-0.05 times of reservoir pore space volume, when injection liquid pressure exceedes stratum reset pressure, stops injecting transfer drive liquid.
4th step: after transfer drive liquid stops note, Injection Well recovers original annotation water, and according to original annotation water speed, (waterflood injection rate is 50-80m
3/ d) start water filling, along with injection water contacts with thickened oil profile control agent, profile control agent is moisture to be increased gradually, and when in profile control agent, moisture content reaches more than 40%, profile control agent viscosity increases sharply, and plays the object of transfer drive in well area far away.
The present invention also aims to provide a kind of operating system for multiviscosisty thin oil transfer drive, realize alternative effect multiviscosisty thin oil transfer drive method.This system mainly comprises: cementing truck (volume 50m
3, belt stirrer), tri-plunger high pressure pump (discharge capacity 3-5m
3/ h, operating pressure 8-16MPa), frequency-variable controller (out-put supply frequency 25-400Hz, adjustable), electromagnetic flowmeter (measurement category 30:1), high pressure line (withstand voltage 20MPa).
The invention provides a kind of alternative effect multiviscosisty thin oil transfer drive system, realize alternative effect multiviscosisty thin oil transfer drive method.This system comprises reciprocating pump, intelligence control system, automatic charging device, agitator tank and blind controller system;
Wherein, reciprocating pump is Double-cylinder single-acting reciprocating pump, and plunger motion speed is slow, and the shearing caused profile control agent is very little, variable-frequency electric acc power is 75Kw, and discharge capacity can be controlled in 6-15m3/h, and maximum working pressure can reach 30MPa, overall mass 10t, mounting means is skid-mounted type, is convenient to resettlement.In addition, because plunger motion speed is slow, wear and tear little, so the time between overhauls(TBO) is very long, the cycle of operation on average can reach more than 60d;
(2) intelligence control system.Intelligence control system is made up of auto-control software, Industrial Personal Computer (IPC), AD/DA analog-digital converter, address card, flow meter, pressure gauge, liquid level feedback system, wireless transport module etc., whole system " heart ", all other parts switches and regulating command, sent after all also being analyzed by image data by it.The pressure and other parameters of the instantaneous delivery in work progress reaches system interface by wireless transmitting system, and operating personnel directly read by intelligence control system and adjust, and constructability personnel grasp well head at any time and inject situation;
(3) automatic charging device.Profile control agent powder is fallen people and promotes in hopper by automatic charging device, material powder is delivered to tapered hopper by screw elevator, material in tapered hopper, through screw feeder, venturi-type eductors, electrical ball valve, pigment mixing head, is handled by powertrain system and is delivered to solution agitator tank;
(4) agitator tank.Water from water pot injects agitator tank, tentatively mixes at pigment mixing head with the supplied materials of automatical feeding system, enters in tank and fully stirs.Agitator tank is furnished with ultrasonic level gage, and can carry out Real-Time Monitoring to liquid level, signal reaches intelligence control system, has warning and automatic stopping function;
(5) blind controller system.Be made up of elements such as electromagnetic valve, frequency converter, multiple contactor, air switch, relays, complete equipment can realize chain automatic control and Non-follow control, can carry out in intelligence control system when controlling liquid level, flow and pressure, also manually can carry out between instrument controls.
Act on above-mentioned alternative the dispensing control system (control system part wherein as shown in Figure 3) that the system support of multiviscosisty thin oil transfer drive uses to be made up of high-pressure water inlet piping, polymer feed device, crosslinking agent feed arrangement and a few major part of automatic control system, control system part as shown in Figure 3 comprises programmable control system, electromagnetic flowmeter, feeding screw, frequency converter, measuring pump and electric control valve.High-pressure water inlet pipeline has installed hand stop valve, electric control valve, electromagnetic flowmeter and ejector successively, High-Pressure Water through ejector time, crosslinking agent liquid or polymer dry powder can suck in water lines by the negative pressure of generation, add in profile control agent tank.In profile control agent tank, agitator is installed, can makes fully to mix into water and medicament.When in tank, liquid level reaches preset value, automatic program is out of service, and motor operated valve cuts out automatically, and profile control agent automatic preparation completes.Stuff level switch installed by the polymer storage tank of polymer feed device, and discharge outlet installs blanking switch and feeding screw, and during feed, polymer falls into hopper, and it is equipped with stuff level switch, and is connected with the ejector on inlet pipeline by flexible pipe.The drive motors of feeding screw, frequency converter and stuff level switch place are wired to control cabinet.Crosslinking agent feed arrangement has installed liquid-level switch on crosslinking agent storage tank, in exit, hand-operated valve is housed, and is connected to measuring pump subsequently.During charging, crosslinking agent falls into hopper, and hopper is connected with the ejector on inlet pipeline by flexible pipe.Measuring pump and liquid-level switch place are wired to control cabinet.Automatic control system is by human and machine interface unit, central control unit and detecting unit composition, by detecting flow of inlet water, implement PID to water inlet electric control valve to regulate, carry out hand control box and automatically control two kinds of modes, according to technological requirement, define chain control with crosslinking agent and polymer controls, complete the automatic control of whole system.Wherein, electric control valve can control piper keying and regulate the size of flow of inlet water; The instantaneous delivery of water inlet and accumulative liquid inlet volume can be obtained by electromagnetic flowmeter; High-Pressure Water, when ejector, can produce negative pressure and be sucked in profile control agent tank by medicament.Polymer feed device forms primarily of polymer storage tank, feeding screw and dry powder hopper.The stuff level switch that storage tank is installed can realize material low alarm function.The keying of feeding screw is controlled according to inflow and feed time automatically by control program, changes feeding quantity by frequency converter adjustable screw axle rotating speed.During feed, polymer falls into dry powder hopper, and polymer is sucked under suction function by the ejector on flexible pipe and inlet pipeline by hopper.Crosslinking agent feed arrangement is made up of crosslinking agent storage tank, measuring pump and crosslinking agent hopper.Liquid-level switch realizes liquid level low alarm function.The keying of measuring pump is controlled according to inflow and feed time automatically by control program, and its feed liquor speed is adjustable.During charging, crosslinking agent falls into hopper, and crosslinking agent is sucked under suction function by the ejector on flexible pipe and inlet pipeline by hopper.
As shown in figs. 4-7, further the programmable control system in profile control agent control system on-the-spot in the present invention is described in detail; Fig. 4 is the structured flowchart of the programmable control system in on-the-spot profile control agent control system; Fig. 5 is the electrical block diagram of the programmable control system in on-the-spot profile control agent control system; Fig. 6 is the storage chip circuit theory diagrams of the programmable control system in on-the-spot profile control agent control system; Fig. 7 is the magnetic coupling buffer circuit schematic diagram of the programmable control system in on-the-spot profile control agent control system.
With reference to accompanying drawing 4, show in particular the structured flowchart of the programmable control system in on-the-spot profile control agent control system, the programmable control system in on-the-spot profile control agent control system comprises: power circuit, voltage sampling circuit, current sampling circuit, computation chip circuit, memory circuit, control circuit, liquid crystal display, infrared communication module, 485 communication modules, carrier communication module, ESAM security module and microprocessor.Power circuit is that modules circuit is powered; Voltage sampling circuit and current sampling circuit are input to the collection port of computation chip circuit; Computation chip circuit be used for control signal metering and by spi bus and microprocessor communication; Memory circuit passes through I2C bus and microprocessor communication, for storage control signal; Microprocessor is according to control signal output safety index signal; Liquid crystal display shows safe index signal, power, voltage, current information; Infrared communication module, 485 communication modules, carrier communication module are all by UART mouth and microprocessor communication; ESAM module adds the safety of control signal, only has the data could being rewritten control circuit by authentication.
With reference to accompanying drawing 5, provide the electrical block diagram of the programmable control system in on-the-spot profile control agent control system further, storage chip is by microprocessor I/O pin powered, under default conditions, I/O pin output low level, storage chip does not work, not power consumption, only have when needing access data, microprocessor just control I/O pin exports high level, and for storage chip is powered, storage chip exchanges data by I2C bus and microprocessor; The communication module such as RS485, carrier wave all connects the UART mouth of microprocessor through the isolation of magnetic coupling; Light resistor R1 mono-termination power end, the other end contact resistance R2 of light resistor R1 and the AD interface of microprocessor; The AD interface of resistance R2 mono-termination light resistor and microprocessor, the other end earth terminal of resistance R2.
With reference to accompanying drawing 6, provide the storage chip circuit theory diagrams of the programmable control system in on-the-spot profile control agent control system further, the I2C interface CPU_SDA that the I2C interface CPU_SCL end that the equal earth terminal of A0, A1, A2 and VSS of storage chip U1, the VCC port of storage chip U1 connect the general purpose I of microprocessor/O interface CPU_I/O end, the WP port earth terminal of storage chip U1, the SCL port of storage chip U1 connect microprocessor, the SDA port of storage chip U1 connect microprocessor holds; Electric capacity C1 is connected in parallel between the VCC port of storage chip U1 and WP port; Resistance R2 is connected in parallel between the VCC port of storage chip U1 and SCL port; Resistance R2 is connected in parallel between the VCC port of storage chip U1 and SDA port.
With reference to accompanying drawing 7, provide the magnetic coupling buffer circuit schematic diagram of the programmable control system in on-the-spot profile control agent control system further, the data that data receiver RX, V1B port is held with connecing data sending terminal TX, GND1 terminated communications modular power source of communication module, VOA/VIA port connects microprocessor that the VIA/VOA port of magnetic lotus root isolating chip U2 connects communication module are sent to data receiver CPU_RX, GND2 port that CPU_TX, VOB port connects microprocessor and hold with connecing power supply of microprocessor; Electric capacity C2 and resistance R4 is all connected on the VDD1 port of communication module power end VCCM and magnetic lotus root isolating chip U2; Electric capacity C3 and resistance R5 is all connected on the VDD2 port of power supply of microprocessor end VCC and magnetic lotus root isolating chip U2.
Further by embodiment, the present invention is described in detail below.
Embodiment 1: multiviscosisty thin oil transfer drive liquid process for preparation
Transfer drive liquid, by dehydration thin oil 99%, thickening agent 0.9%, the auxiliary agent 0.1% according to weight ratio, stirs 1h with the mixing speed of 100r/min, obtains uniform multiviscosisty thin oil transfer drive liquid in normal temperature Agitation Tank.
Embodiment 2: multiviscosisty thin oil transfer drive liquid implant operation system flow chart
In multiviscosisty thin oil transfer drive liquid injection process, prepare transfer drive liquid by cementing truck tank according to embodiment 1, after having prepared, by three plunger high head injection pumps, transfer drive liquid is clamp-oned stratum through sleeve valve from oil jacket annular space.
1-cementing truck in Fig. 1; 2-frequency-variable controller; 3-tri-plunger high pressure pump; 4-electromagnetic flowmeter; 5-tubing valve; 6-sleeve valve; 7-tubing gauge.
Embodiment 3: carried out on-the-spot confidentiality in Huan Xi oil field, the Liaohe River and tested and achieve satisfied effect
Huan Xi oil field, the Liaohe River, through nearly 40 years waterflooding extractions, enters development late stage at present, well water all more than 90%, day produce oil be less than 1.5 tons, all do not dealt with problems by gel profile control several times; Use technology of the present invention, we have carried out multiviscosisty thin oil transfer drive, Be very effective to certain well of joyous west.
Joyous west well basic data:
Reservoir interpretation table
Joyous western oil field well, day production fluid 53.7 side, day produce oil 1.1 tons, moisture 98%.Oil well High water cut, determines to carry out multiviscosisty thin oil transfer drive.Design injection 130 side, actual injection 130 sides, injection process pressure history is shown in Fig. 2.After profile control agent terminates injection, with return water 50 side, profile control agent is replaced to oil reservoir deep, closing well 1 day.
After driving a well, day production fluid 38.9 side, day produce oil 10.5 tons, moisture 73.0%, tiredly increase oil 1126 tons, precipitation 2670 side, successful.Accumulative enforcement 15 well at present, accumulative increasing oil 10890 tons.
The present invention compared with prior art, has following advantage:
(1) multiviscosisty thin oil transfer drive method is different from gel-like transfer drive, can avoid because plastic is too fast and only play near wellbore zone
Effect, this profile control agent only has viscosity after contact with water just to increase gradually after injecting stratum, is therefore easier to migrate to earth formation deep, and the distance playing profile control effect is farther.
(2) multiviscosisty thin oil profile control agent has chance water thickening, meets oil not thickening feature, dissolves each other, play displacement effect at oil reservoir and underground crude oil; At the alternative shutoff water layer of water layer, can flow after pressurization, by a relatively large margin suggestions for improvement.
(3) crude oil is applied as primary raw material, at oil field Raw wide material sources, and good with oil reservoir compatibility, to reservoir fanout free region, pollution-free.
(4) profile control agent main component is crude oil, injects behind stratum, along with oil field is continually developed, also can back production out, recycle, Produced Liquid does not need specially treated simultaneously, significantly reduces financial cost.
The above; be only the present invention's preferably detailed description of the invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.This area those skilled in the art are appreciated that when not deviating from the spirit and scope of the present invention of claims definition, can make various amendment in form and details.
Claims (7)
1. an alternative effect multiviscosisty thin oil transfer drive method, it comprises the following steps:
The first step: use clean water water injection well;
Second step: preparation transfer drive liquid;
3rd step: the transfer drive liquid of above-mentioned preparation is injected water injection well;
4th step: after transfer drive liquid stops note, when moisture content reaches more than 40% in profile control agent, profile control agent viscosity increases sharply, and plays the object of transfer drive in well area far away.
2., according to the alternative effect multiviscosisty thin oil transfer drive method of claim 1, it is characterized in that, in a first step, at original annotation well waterflood injection rate, (waterflood injection rate is 50-80m to the injection rate of clear water
3/ d) increase by 10% on basis, injection pressure increases and is no more than 5% on original annotation well injection pressure basis.
3. according to the alternative effect multiviscosisty thin oil transfer drive method of claim 1, it is characterized in that, in second step, be less than 1% to moisture content, viscosity is less than in the dewatered oil of 50mPa.s and adds 0.9% thickening agent, 0.1% auxiliary agent successively according to weight ratio, all the other 99% compositions are crude oil, stir 1 hour, make it mix, be mixed with multiviscosisty thin oil profile control agent.
4., according to the alternative effect multiviscosisty thin oil transfer drive method of claim 1, it is characterized in that, in the third step, injection mode is, at original annotation well waterflood injection rate, (waterflood injection rate is 50-80m to the injection rate of transfer drive liquid
3/ d) reduction by 10% on basis, injection rate is 0.01-0.05 times of reservoir pore space volume, when injection liquid pressure exceedes stratum reset pressure, stops injecting transfer drive liquid.
5. according to the alternative effect multiviscosisty thin oil transfer drive method of claim 1, it is characterized in that, in the 4th step, Injection Well recovers original annotation water, and according to original annotation water speed, (waterflood injection rate is 50-80m
3/ d) start water filling, along with injection water contacts with thickened oil profile control agent, profile control agent is moisture to be increased gradually, and when in profile control agent, moisture content reaches more than 40%, profile control agent viscosity increases sharply, and plays the object of transfer drive in well area far away.
6., according to arbitrary alternative effect multiviscosisty thin oil transfer drive method of claim 1-5, it is characterized in that, profile control agent is made up of the thin oil that dewaters, thickening agent and auxiliary agent.
7., according to the alternative effect multiviscosisty thin oil transfer drive method of claim 6, it is characterized in that, said method is applicable to waterflooding oil field multiviscosisty thin oil transfer drive.
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Effective date of registration: 20201116 Address after: 100007 Beijing, Dongzhimen, North Street, No. 9, No. Patentee after: PetroChina Co.,Ltd. Address before: 124010 Experimental Technology Research Institute of Liaohe oilfield exploration and development, Xinglongtai District, Panjin, Liaoning Patentee before: Xiao Chuanmin |