CN103244089B - The exploitation method of microwave radiation technology solvent extraction viscous crude - Google Patents
The exploitation method of microwave radiation technology solvent extraction viscous crude Download PDFInfo
- Publication number
- CN103244089B CN103244089B CN201310131948.6A CN201310131948A CN103244089B CN 103244089 B CN103244089 B CN 103244089B CN 201310131948 A CN201310131948 A CN 201310131948A CN 103244089 B CN103244089 B CN 103244089B
- Authority
- CN
- China
- Prior art keywords
- horizontal
- well
- solvent
- upper water
- horizontal well
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
Abstract
The present invention is the exploitation method of a kind of microwave radiation technology solvent extraction viscous crude, and the method comprises the following steps: arrange horizontal flooding pattern in heavy crude reservoir mining area, and upper water horizontal well is solvent Injection Well, and lower horizontal well is producing well; Utilize fracturing technique to carry out horizontal and vertical at upper level well horizontal segment and oil reservoir correspondence position and make seam; Implantation silicon carbide particle in horizontal and vertical crack; In upper water horizontal well well head and well, dispose microwave generation equipment, and regulate the power of micro-wave generating apparatus along journey variations in temperature according to the horizontal segment of upper water horizontal well; Light paraffins solvent is injected to top horizontal well; Lower horizontal producing well recovers the oil continuously.The method utilizes silicon-carbide particle proppant efficient heat transfer viscosity reduction in crack, the fast instant oily viscosity reduction of hot solvent is combined with three's advantage of the intensification Rapid Extraction of hot solvent, realize the solvent Rapid Extraction viscous crude of microwave fast heating on a large scale on oil reservoir basis, heavy crude reservoir cost of winning be can effectively reduce, production rate and recovery ratio improved.
Description
Technical field
The invention relates to the exploitation method of heavy crude reservoir in field of petroleum exploitation, particularly relate to the exploitation method of a kind of microwave radiation technology solvent extraction viscous crude.
Background technology
Heavy crude reservoir refers to that degassed crude viscosity is greater than the oil reservoir of 100 centipoises under formation temperature, and in China Liaohe Oil Field, Xinjiang TulufanHami oil field, Karamay oilfield etc. have large area to distribute; The ground such as Canada, Venezuela is also contained abroad huge reserves; According to incompletely statistics, in world wide, following developable crude resources amount has 70% to be viscous crude.
The exploiting tech for principal part of heavy crude reservoir is waterflooding extraction technology, steam injection development technology and air injection combustion in situ development technique.Wherein, waterflooding extraction technology is mainly for the heavy crude reservoir of underground viscosity of crude below 1000 centipoises, for the heavy crude reservoir of underground viscosity of crude higher than 1000 centipoises, because the mobility ratio of the injecting process Crude Oil and water is too large, cause that to inject the flow resistance that water enters oil reservoir comparatively large, inject water easily along height in oil reservoir ooze passage alter into, thus make the too early sudden water flooding of producing well, water-flooding performance and recovery ratio are all on the low side, and usual water drive recovery factor of heavy oil reservoir is about 30%.
Steam injection development technology is mainly used in the heavy crude reservoir that underground viscosity of crude is greater than 1000 centipoises, waterflooding effect difference, and common steam injection development technology has steam soak and steam flooding technology.Steam soak refers to and injects a certain amount of steam by a bite well to continuous high speed in oil reservoir, then the technology of closing well a period of time opening well and making production again, it is advantageous that steam heat utilization rate is high, the steam injected is few, the back production phase is long, gas oil ratio and good in economic efficiency, and complete in a bite well due to the process of handling up, alter risk without vapour between well; But due to the mining type that steam soak is the continuous exhaustion of a kind of energy, along with handling up, round increases, reservoir pressure declines fast, after reservoir pressure is lower than 2MPa, the effective production time that continues to handle up is short, cycle gas oil ratio sharply declines with economic benefit of handling up, and recovery ratio of usually handling up only has between 20 ~ 30%.Steam flooding technology is the substituted technique increasing substantially recovery ratio after steam soak, recovery ratio can in improve 10 ~ 20 percentage points on basis of handling up, but, due to heavy crude reservoir non-homogeneity, in steam-drive process, vapour is altered seriously, and cause steam heat waste greatly, gas oil ratio is on the low side, deficiency in economic performance, or without economic benefit.
Air injection situ combustion technology is under certain well pattern condition, in oil reservoir, inject air light oil reservoir, then continue air injection and maintain underground combustion, produce high temperature pyrolysis viscous crude and heating, viscosity reducing viscous crude by burning, the flue gas displace crude oil produced by burning, compared with steam injection technology, situ combustion technology produces heat at underground combustion, capacity usage ratio is high, and energy consumption is low, and crude oil upgrading is effective; But because in combustion in situ process, live wire leading edge is difficult to effective control, cause live wire easily to advance by leaps and bounds forward along preferential path, greatly increase producing well fire and alter risk, therefore, the security risk of combustion in situ is larger; In addition, in combustion in situ process, producing well extraction fluid temperature (F.T.) is higher, needs ripe supporting resistant to elevated temperatures completion, well cementation and high temperature lifting technology technology; Just carried out the field test of situ combustion technology successively from the sixties in last century both at home and abroad, but due to above-mentioned safety and technology reason, except two trial zones of Romania and India are declared successfully, all the other are all defeated utterly.
The people such as Canadian Bulter propose solvent extraction (VAPEX) exploitation method the eighties in last century, its principle utilizes a pair stacked up and down horizontal well, upper water horizontal well injects the light paraffins dicyandiamide solution that carbon number is C3 ~ C8, lower horizontal well continuous seepage.Solvent injects after inside oil reservoir, and the vertical gravitational differentiation because density contrast produces of solvent and viscous crude, solvent up flows, and crude oil is toward current downflow.Solvent is dissolved into inside viscous crude on the wall of solvent chamber, because solvent has higher diffusivity in viscous crude, solvent has good extractive distillation effect to viscous crude simultaneously, therefore in viscous crude except asphalt residue, all the other components are all flowed to the horizontal production well of bottom by solvent extraction, thus the solvent extraction realizing viscous crude and upgrading on the spot; And the solvent of extraction can refill oil reservoir through simple separation, solvent recycling rate of waterused can up to 80%, and therefore the injection cost of this technology is well below steam injection cost.But solvent extraction technology adopts technology owing to being that one is cold in essence, under cryogenic conditions, viscosity of thickened oil is high, the molten oily resistance of solvent is large, coefficient of molecular diffusion is lower, therefore existing low-temperature solvent extraction daily oil production is low, rate of oil production is slow, and mining site investment of production is long for payoff period, is unfavorable for that large-scale commercial is developed.
For heavy crude reservoir, seeking the production technique of a kind of low energy consumption, high rate of oil production, high recovery rate, high economic benefit, is the developing direction of following the Technology of Heavy Oil Recovery.
Thus, the present inventor relies on experience and the practice of being engaged in relevant industries for many years, proposes the exploitation method of a kind of microwave radiation technology solvent extraction viscous crude, to overcome the defect of prior art.
Summary of the invention
The object of the present invention is to provide a kind of microwave radiation technology solvent to extract the exploitation method of viscous crude, effectively to reduce heavy crude reservoir cost of winning, improve heavy crude reservoir production rate and recovery ratio.
The object of the present invention is achieved like this, a kind of exploitation method of microwave radiation technology solvent extraction viscous crude, and described exploitation method comprises the following steps:
(1) horizontal flooding pattern is set in heavy crude reservoir production zone; Described horizontal flooding pattern comprises at least one pair of horizontal well pair; Described horizontal well to by vertical plane same in oil reservoir be upper-lower position arrange a bite solvent Injection Well and a bite producing well form, described solvent Injection Well is upper water horizontal well, and described producing well is lower horizontal well;
(2) utilize the continuous fracturing technique of horizontal well horizontal segment to carry out level at horizontal segment and the oil reservoir correspondence position of upper water horizontal well to make to stitch and make seam with vertical;
(3) to implantation silicon carbide particle in horizontal fracture and vertical fracture as high-temperature heat-transfer medium;
(4) at upper water horizontal well well head part administration microwave generator, enter to connect the microwave ingress pipe of described microwave generator under in the horizontal well of top, this microwave ingress pipe extends to the horizontal segment tiptoe of upper water horizontal well, and the microwave ingress pipe of the horizontal segment of described upper water horizontal well evenly arranges Microwave emission hole;
(5) open microwave generator, the horizontal segment of monitoring upper water horizontal well along journey variations in temperature, and regulates microwave generator power according to along journey variations in temperature;
(6) light paraffins solvent is injected continuously to described upper water horizontal well;
(7) lower horizontal producing well recovers the oil continuously.
In a better embodiment of the present invention, the oil reservoir that described horizontal flooding pattern is greater than 15m at individual layer effective thickness is laid.
In a better embodiment of the present invention, in described step (1), the horizontal segment of upper water horizontal well is positioned at oil reservoir top or middle part, the horizontal segment of described lower horizontal well to be positioned at bottom oil reservoir and distance oil reservoir bottom interface 1 ~ 2m, vertical distance between the horizontal segment of described upper water horizontal well and the horizontal segment of described lower horizontal well is 5 ~ 6m, and the horizontal section length of described upper water horizontal well and the horizontal section length of lower horizontal well are more than 600m.
In a better embodiment of the present invention, in described step (2), 6 ~ 15 vertical fractures are produced at the horizontal segment of upper water horizontal well and oil reservoir correspondence position continuous uniform pressure break, 6 ~ 15 horizontal fractures are produced at the horizontal segment of upper water horizontal well and oil reservoir correspondence position continuous uniform pressure break, described vertical fracture and horizontal fracture are at the horizontal segment of described upper water horizontal well in being crisscross arranged, and the distance between described vertical fracture and adjacent level crack is 30 ~ 60m.
In a better embodiment of the present invention, in described step (2), the continuous pressure break of upper water horizontal well produces in vertical fracture process, and the fracture length to downward-extension is no more than the vertical distance between the horizontal segment of described upper water horizontal well and the horizontal segment of described lower horizontal well.
In a better embodiment of the present invention, in described step (3), the granularity of silicon-carbide particle is 8 ~ 20 orders, and the injecting program of silicon-carbide particle is: 1. first in crack, inject prepad fluid; 2. utilize pressure break load fluid to carry silicon-carbide particle and inject crack, as fracture support agent; 3. inject displacement fluid and silicon-carbide particle and load fluid are clamp-oned depths, crack; 4. recycle pressure break load fluid and carry silicon-carbide particle injects near wellbore zone crack as fracture support agent, make silicon-carbide particle near wellbore zone to continuous distributed in the fracturing fracture of oil reservoir depths.
In a better embodiment of the present invention, in described step (5), 6 ~ 20 thermocouples are disposed, for regulating the power of microwave generator along journey variations in temperature according to variations in temperature in the horizontal segment pit shaft of upper water horizontal well described in timely monitor at the horizontal segment interval of described upper water horizontal well.
In a better embodiment of the present invention, described thermocouple is disposed on the thermocouple cable that is connected with ground control unit; When the average temperature of described upper level well horizontal segment annular space rises to more than 250 DEG C, lower microwave generator power, until the average temperature of horizontal segment annular space drops to 200 ~ 220 DEG C; When the average temperature of described upper level well horizontal segment annular space drops to below 150 DEG C, raise microwave generator power, until the average temperature of horizontal segment annular space rises to 200 ~ 220 DEG C.
In a better embodiment of the present invention, in described step (6), the alkane solvent of described light paraffins solvent to be carbon number be C3, C4, C5, C6, C7 or C8, or the mixture being their wherein two or more solvents; The injection rate of described light paraffins solvent is 100 ~ 300m
3/ sky; The average injection pressure 0.3 ~ 0.7MPa higher than the average discharge opeing pressure of lower horizontal well annular space of described upper level well horizontal segment annular space.
In a better embodiment of the present invention, in described step (7), described lower horizontal well adopts the mode of blowing or artificial lift to recover the oil continuously; The solvent of extraction is injected by surface separation Posterior circle.
From the above mentioned, the exploitation method of microwave radiation technology solvent extraction viscous crude of the present invention, at same oil reservoir On-premise horizontal well pair stacked up and down, contiguous segmentation pressure break is carried out to the horizontal segment of upper water horizontal well and produces horizontal fracture and vertical fracture, in crack, implantation silicon carbide (diamond dust) particle is as fracture support agent, enter to connect the microwave ingress pipe of terrestrial microwave generator under in horizontal segment screen casing to horizontal segment tiptoe, the microwave ingress pipe of horizontal segment evenly disposes Microwave emission hole, continue to carry out carry out microwave radiation heating to the silicon-carbide particle of high thermal conductivity coefficient by the microwave of certain power, it is made to be rapidly heated more than 200 DEG C by conduction of heat heating oil reservoir after silicon-carbide particle heats up, make viscous crude intensification viscosity reduction, light paraffins solvent is injected with certain speed from described upper water horizontal well, under the gravitational differentiation that solvent and viscous crude produce at density contrast along vertical and horizontal crack constantly to oil reservoir top and extending transversely, form solvent chamber, under the effect of high-temperature carborundum heating in crude oil, solvent has very high coefficient of molecular diffusion, energy rapid solution is in the viscous crude of heating, viscosity reducing, and extractive distillation is carried out to viscous crude, extractive distillation viscosity of crude out drops to several centipoise, there is the high fluid ability the same with thin oil, flow under the influence of gravity in the horizontal production well of bottom.Exploitation method of the present invention, can effectively reduce heavy crude reservoir cost of winning, improves heavy crude reservoir production rate and recovery ratio.
The present invention has following technical advantage:
(1) Heavy Oil Reservoir is microwave weak absorbing medium, and domestic and international result of study shows, in conventional microwave heating process, can only heat the oil reservoir within the scope of 5 meters, near wellbore zone, cannot heat farther wider oil reservoir; And the present invention adopts the continuous manually vertical and level of horizontal segment to make seam, and to implantation silicon carbide particle in crack as fracture support agent, effectively can improve the microwave absorbability of oil reservoir, in microwave heating process, the crack extending to oil reservoir depths near upper level well shaft is due to the heat transfer of silicon-carbide particle and intensification, form a rule high-temperature heat-conductive passage and extend to oil reservoir depths, thus realize the heating of deep on a large scale that plane is greater than 40 meters of radiuses and longitudinally covers whole core intersection.
(2) silicon-carbide particle has high temperature resistant, stable chemical performance, hardness large (Mohs' hardness is 9.5 grades, be only second to diamond), heat conductivility is good, can the advantage such as anti-oxidant when shock resistance, high temperature, using silicon-carbide particle as making seam proppant, high-temperature carborundum crack passage of heat can be formed for a long time, the large-scale oil reservoir of heating continued viscosity reduction crude oil, improve the mobile performance in crude oil downward gravity drainage process, realize long stable high yield.
(3) employing injects light paraffins solvent continuously from upper water horizontal well, owing to producing longitudinal gravitational differentiation with the density contrast of crude oil after solvent injects, solvent continues upwards to expand along vertical fractures, continues extending transversely along horizontal fracture, thus forms the solvent chamber constantly increased; On surface, solvent chamber, solvent rapid solution further viscosity reduction high temperature quick extraction is carried out to viscous crude in crude oil, the viscous crude component extracted flows into lower horizontal well (producing well) together along with solvent, thus, and can Accelerate solvent extraction, fast gravity drainage and high-speed production; Meanwhile, the viscous crude component except asphalt residue all can solvent extraction extraction, and therefore recovery ratio is high, usually can reach more than 80%.
(4) keep lower injection production pressure difference between injection-production well, be conducive to solvent chamber upwards with extending transversely, evade solvent directly under scurry into lower horizontal producing well, can effectively avoid solvent inefficient cycle.
(5) solvent of extraction can refill in oil reservoir through simple separation on ground, and therefore solvent utilization rate is high, and ton oil running cost is low, good in economic efficiency.
Accompanying drawing explanation
The following drawings is only intended to schematically illustrate the present invention and explain, not delimit the scope of the invention.Wherein:
Fig. 1: be the horizontal flooding pattern schematic diagram in the present invention and solvent chamber extension principle schematic diagram;
Fig. 2: the continuous fracturing fracture distribution schematic diagram of the horizontal segment for middle and upper part of the present invention horizontal well;
Fig. 3: be the structural representation of the upper water horizontal well in the present invention.
Drawing reference numeral:
Upper water horizontal well 11 lower horizontal well 12 solvent chamber 2
Solvent extraction draining district 3 vertical fracture 41 horizontal fracture 42
Microwave generator 51 microwave ingress pipe 52 Microwave emission hole 53
Thermocouple cable 61 thermocouple 62 surface pipe 71
Protective casing 72 screen casing 73 note solvent oil pipe 81
Solvent injection hole 82 oil reservoir 9
Detailed description of the invention
In order to there be understanding clearly to technical characteristic of the present invention, object and effect, now contrast accompanying drawing and the specific embodiment of the present invention is described.
Embodiment 1
Explain exploitation method of the present invention for a certain heavy crude reservoir, but it should be noted that the present invention is never limited to this heavy crude reservoir.The oil reservoir degree of depth is 300m, and the viscosity of crude under reservoir temperature is 100000 centipoises, and original mean reservoir pressure is 2.5MPa, the effectively average 15m of oil reservoir 9 thickness.
A, dispose horizontal flooding pattern:
As shown in Figure 1, first in main force's heavy oil tested layer 9 of this Shallow Heavy Oil Reservoir, arrange upper water horizontal well (solvent Injection Well) 11 and lower horizontal well (producing well) 12, upper water horizontal well 11 and lower horizontal well 12 are positioned at same vertical plane position;
In drilling process, be 5 ~ 6m in order to ensure the vertical distance between the horizontal segment of upper water horizontal well 11 and the horizontal segment of lower horizontal well 12, utilize the accurate control well track of magnetic steering;
Solvent Injection Well and producing well all adopt the surface pipe bottom of 11 inches to be connected 9 inches of protective casings, and these 9 inches of protective casing bottoms connect 7 inches of horizontal segment cutting seam sieve tube 73 completions again; For solvent Injection Well 11, as shown in Figure 3, solvent Injection Well 11, by the surface pipe 71 of 11in, connects 9in protective casing 72, then connects 7in horizontal segment cutting seam sieve tube 73 completion;
Upper water horizontal well (Injection Well) 11 is 600m with the horizontal section length of upper water horizontal well (producing well) 12, producing well 12 horizontal segment distance oil reservoir 9 end circle 1m, Injection Well 11 horizontal segment and the vertical distance 5m of producing well horizontal segment;
Enter multiple temperature thermocouple 62 spaced apart under in Injection Well 11 horizontal segment screen casing 73, the present embodiment lays 6 temperature thermocouples 62, and described temperature thermocouple 62 is connected to ground Central Control Room by a thermocouple cable;
Enter micro waveguide under in Injection Well 11 horizontal segment screen casing 73 and enter pipe 52 to horizontal segment tiptoe, described microwave ingress pipe 52 is in horizontal segment 6 Microwave emission holes 53 spaced apart, and described microwave ingress pipe 52 is upward through well head and is connected with the HIGH-POWERED MICROWAVES generator 51 on ground; Described microwave generator, microwave ingress pipe and the connected mode etc. between them are existing mature technology, do not repeat them here.
Enter to note solvent oil pipe 81 under in Injection Well 11 horizontal segment screen casing 73, described note solvent oil pipe 81 is at horizontal segment continuous distributed 6 solvent injection holes 82;
As shown in Figure 3, described temperature thermocouple 62, Microwave emission hole 53 are positioned at mutually corresponding same position with solvent injection hole 82 at horizontal segment.
B, artificial fracturing make seam:
Carry out level at horizontal segment and oil reservoir 9 correspondence position of upper water horizontal well 11 to make to stitch and make seam with vertical, the continuous fracturing technique of horizontal well horizontal segment well known in the art is utilized to carry out pressure break, as shown in Figure 2, 6 vertical fractures 41 are produced at upper water horizontal well 11 horizontal segment and oil reservoir 9 correspondence position continuous uniform pressure break, 6 horizontal fractures 42 are produced at upper level well horizontal segment and oil reservoir 9 correspondence position continuous uniform pressure break, described vertical fracture 41 and horizontal fracture 42 at the horizontal segment of described upper water horizontal well 11 in being crisscross arranged, described distance between each vertical fracture 41 and adjacent horizontal fracture 42 is 30 ~ 50m, this distance is set to 50m in the present embodiment, described vertical fracture 41 and temperature thermocouple 62, Microwave emission hole 53 is positioned at mutually corresponding same position with solvent injection hole 82 at horizontal segment, the continuous pressure break of described horizontal well produces in vertical fracture 41 process, and the fracture length to downward-extension is no more than the vertical distance between the horizontal segment of described upper water horizontal well 11 and the horizontal segment of described lower horizontal well (producing well) 12, is namely no more than 5m,
In crack, inject the silicon-carbide particle of certain particle size as high-temperature heat-transfer medium, the granularity of silicon-carbide particle is 8 ~ 20 orders, and the injecting program of described silicon-carbide particle is: 1. first in crack, inject a certain amount of prepad fluid; 2. the silicon-carbide particle utilizing pressure break load fluid to carry certain particle size injects crack as fracture support agent; 3. inject certain displacement fluid and silicon-carbide particle and load fluid are clamp-oned depths, crack; 4. recycle pressure break load fluid and carry the silicon-carbide particle of certain particle size as the crack of fracture support agent injection near wellbore zone, make silicon-carbide particle continuous distributed in the fracturing fracture of 9 depths near wellbore zone to oil reservoir.
C, note solvent are produced:
Open microwave generator 51, also regulate the power of microwave generator accordingly along journey variations in temperature in the horizontal segment pit shaft of upper water horizontal well 11 described in 6 temperature thermocouple 62 timely monitors described in utilization, particularly, when the average temperature of described upper water horizontal well 11 horizontal segment annular space rises to more than 250 DEG C, lower microwave generator 51 power, until the average temperature of horizontal segment annular space drops to 200 DEG C; When the average temperature of described upper water horizontal well 11 horizontal segment annular space drops to below 150 DEG C, raise the power of microwave generator 51, until the average temperature of horizontal segment annular space rises to 200 DEG C.
Continuously inject light paraffins solvent to described top Injection Well 11, the alkane solvent of described light paraffins solvent can be carbon number be C3, C4, C5, C6, C7 or C8, or be the mixture of their wherein two or more solvents, described carbon number is that the alkane solvent of C3, C4, C5, C6, C7 or C8 is respectively propane, butane, pentane, hexane, heptane or octane, in the present embodiment, the light paraffins solvent (propane) that carbon number is C3 is injected, under the gravitational differentiation that solvent and viscous crude produce at density contrast along vertical and horizontal crack constantly to oil reservoir 9 top and extending transversely, form solvent chamber 2 (as shown in Figure 2), under the effect of high-temperature carborundum heating in crude oil, solvent has very high coefficient of molecular diffusion, energy rapid solution is in the viscous crude of heating, viscosity reducing, and extractive distillation is carried out to viscous crude, extractive distillation viscosity of crude out drops to several centipoise, there is the high fluid ability the same with thin oil, flow under the influence of gravity in lower horizontal well (producing well), and form solvent extraction draining district 3 (as shown in Figure 2), lower horizontal producing well 12 recovers the oil continuously, the injection rate of described light paraffins solvent is 100 ~ 300m
3/ sky, particularly, the initial stage is 100m
3/ sky, Second Year brings up to 150m
3/ sky, along with solvent chamber is constantly expanded, brings up to 300m on the 3rd year
3/ sky, the average injection pressure of described upper water horizontal well 11 horizontal segment annular space is than the average discharge opeing pressure height 0.3MPa of bottom producing well 12 horizontal segment annular space, described lower horizontal producing well 12 adopts the mode of blowing to recover the oil continuously.
From the above mentioned, the exploitation method of microwave radiation technology solvent extraction viscous crude of the present invention, at same oil reservoir 9 On-premise horizontal well pair stacked up and down, contiguous segmentation pressure break is carried out to the horizontal segment of upper water horizontal well and produces horizontal fracture and vertical fracture, in crack, implantation silicon carbide (diamond dust) particle is as fracture support agent, enter to connect the microwave ingress pipe of terrestrial microwave generator under in horizontal segment screen casing to horizontal segment tiptoe, the microwave ingress pipe of horizontal segment evenly disposes Microwave emission hole, continue to carry out carry out microwave radiation heating to the silicon-carbide particle of high thermal conductivity coefficient by the microwave of certain power, it is made to be rapidly heated more than 200 DEG C by conduction of heat heating oil reservoir 9 after silicon-carbide particle heats up, make viscous crude intensification viscosity reduction, light paraffins solvent is injected with certain speed from described upper water horizontal well, under the gravitational differentiation that solvent and viscous crude produce at density contrast along vertical and horizontal crack constantly to oil reservoir 9 top and extending transversely, form solvent chamber, under the effect of high-temperature carborundum heating in crude oil, solvent has very high coefficient of molecular diffusion, energy rapid solution is in the viscous crude of heating, viscosity reducing, and extractive distillation is carried out to viscous crude, extractive distillation viscosity of crude out drops to several centipoise, there is the high fluid ability the same with thin oil, flow under the influence of gravity in the horizontal production well of bottom.Exploitation method of the present invention, can effectively reduce heavy crude reservoir cost of winning, improves heavy crude reservoir production rate and recovery ratio.
Embodiment 2
The oil reservoir degree of depth is 400m, and the viscosity of crude under reservoir temperature is 200000 centipoises, and original mean reservoir pressure is 3.5MPa, the effectively average 25m of oil reservoir 9 thickness.
A, dispose horizontal flooding pattern:
As shown in Figure 1, first in main force's heavy oil tested layer 9 of this Shallow Heavy Oil Reservoir, arrange upper water horizontal well (solvent Injection Well) 11 and lower horizontal well (producing well) 12, upper water horizontal well 11 and lower horizontal well 12 are positioned at same vertical plane position;
In drilling process, be 5 ~ 6m in order to ensure the vertical distance between the horizontal segment of upper water horizontal well 11 and the horizontal segment of lower horizontal well 12, utilize the accurate control well track of magnetic steering;
Solvent Injection Well and producing well all adopt the surface pipe bottom of 11 inches to be connected 9 inches of protective casings, and these 9 inches of protective casing bottoms connect 7 inches of horizontal segment cutting seam sieve tube 73 completions again; For solvent Injection Well 11, as shown in Figure 3, solvent Injection Well 11, by the surface pipe 71 of 11in, connects 9in protective casing 72, then connects 7in horizontal segment cutting seam sieve tube 73 completion;
Upper water horizontal well (Injection Well) 11 is 900m with the horizontal section length of upper water horizontal well (producing well) 12, producing well 12 horizontal segment distance oil reservoir 9 end circle 2m, Injection Well 11 horizontal segment and the vertical distance 6m of producing well horizontal segment;
Enter multiple temperature thermocouple 62 spaced apart under in Injection Well 11 horizontal segment screen casing 73, the present embodiment lays 6 temperature thermocouples 62, and described temperature thermocouple 62 is connected to ground Central Control Room by a thermocouple cable;
Enter micro waveguide under in Injection Well 11 horizontal segment screen casing 73 and enter pipe 52 to horizontal segment tiptoe, described microwave ingress pipe 52 is in horizontal segment 6 Microwave emission holes 53 spaced apart, and described microwave ingress pipe 52 is upward through well head and is connected with the HIGH-POWERED MICROWAVES generator 51 on ground; Described microwave generator, microwave ingress pipe and the connected mode etc. between them are existing mature technology, do not repeat them here.
Enter to note solvent oil pipe 81 under in Injection Well 11 horizontal segment screen casing 73, described note solvent oil pipe 81 is at horizontal segment continuous distributed 6 solvent injection holes 82;
As shown in Figure 3, described temperature thermocouple 62, Microwave emission hole 53 are positioned at mutually corresponding same position with solvent injection hole 82 at horizontal segment, are conducive to injecting the silicon-carbide particle flash heat transfer in crack and being rapidly heated of injection solvent.
B, artificial fracturing make seam:
Carry out level at horizontal segment and oil reservoir 9 correspondence position of upper water horizontal well 11 to make to stitch and make seam with vertical, the continuous fracturing technique of horizontal well horizontal segment well known in the art is utilized to carry out pressure break, as shown in Figure 2, 8 vertical fractures 41 are produced at upper water horizontal well 11 horizontal segment and oil reservoir 9 correspondence position continuous uniform pressure break, 8 horizontal fractures 42 are produced at upper level well horizontal segment and oil reservoir 9 correspondence position continuous uniform pressure break, described vertical fracture 41 and horizontal fracture 42 at the horizontal segment of described upper water horizontal well 11 in being crisscross arranged, described distance between each vertical fracture 41 and adjacent horizontal fracture 42 is 30 ~ 50m, this distance is set to 60m in the present embodiment, described temperature thermocouple 62, Microwave emission hole 53 is positioned at mutually corresponding same position with solvent injection hole 82 at horizontal segment, the continuous pressure break of described horizontal well produces in vertical fracture 41 process, and the fracture length to downward-extension is no more than the vertical distance between the horizontal segment of described upper water horizontal well 11 and the horizontal segment of described lower horizontal well (producing well) 12, is namely no more than 6m,
In crack, inject the silicon-carbide particle of certain particle size as high-temperature heat-transfer medium, the granularity of silicon-carbide particle is 8 ~ 20 orders, and the injecting program of described silicon-carbide particle is: 1. first in crack, inject a certain amount of prepad fluid; 2. the silicon-carbide particle utilizing pressure break load fluid to carry certain particle size injects crack as fracture support agent; 3. inject certain displacement fluid and silicon-carbide particle and load fluid are clamp-oned depths, crack; 4. recycle pressure break load fluid and carry the silicon-carbide particle of certain particle size as the crack of fracture support agent injection near wellbore zone, make silicon-carbide particle continuous distributed in the fracturing fracture of 9 depths near wellbore zone to oil reservoir.
C, note solvent are produced:
Open microwave generator 51, also regulate the power of microwave generator accordingly along journey variations in temperature in the horizontal segment pit shaft of upper water horizontal well 11 described in 6 temperature thermocouple 62 timely monitors described in utilization, particularly, when the average temperature of described upper water horizontal well 11 horizontal segment annular space rises to more than 250 DEG C, lower microwave generator 51 power, until the average temperature of horizontal segment annular space drops to 220 DEG C; When the average temperature of described upper water horizontal well 11 horizontal segment annular space drops to below 150 DEG C, raise the power of microwave generator 51, until the average temperature of horizontal segment annular space rises to 220 DEG C.
Continuously inject light paraffins solvent to described top Injection Well 11, the alkane solvent of described light paraffins solvent can be carbon number be C3, C4, C5, C6, C7 or C8, or be the mixture of their wherein two or more solvents, described carbon number is that the alkane solvent of C3, C4, C5, C6, C7 or C8 is respectively propane, butane, pentane, hexane, heptane or octane, in the present embodiment, the light paraffins solvent (octane) that carbon number is C8 is injected, under the gravitational differentiation that solvent and viscous crude produce at density contrast along vertical and horizontal crack constantly to oil reservoir 9 top and extending transversely, form solvent chamber 2 (as shown in Figure 2), under the effect of high-temperature carborundum heating in crude oil, solvent has very high coefficient of molecular diffusion, energy rapid solution is in the viscous crude of heating, viscosity reducing, and extractive distillation is carried out to viscous crude, extractive distillation viscosity of crude out drops to several centipoise, there is the high fluid ability the same with thin oil, flow under the influence of gravity in lower horizontal well (producing well), and form solvent extraction draining district 3 (as shown in Figure 2), lower horizontal producing well 12 recovers the oil continuously, the injection rate of described light paraffins solvent is 100 ~ 300m
3/ sky, particularly, the initial stage is 100m
3/ sky, Second Year brings up to 200m
3/ sky, along with solvent chamber is constantly expanded, brings up to 300m on the 3rd year
3/ sky, the average injection pressure of described upper water horizontal well 11 horizontal segment annular space is than the average discharge opeing pressure height 0.7MPa of bottom producing well 12 horizontal segment annular space, described lower horizontal producing well 12 adopts the mode of blowing to recover the oil continuously.
The present invention has following technical advantage:
(1) Heavy Oil Reservoir is microwave weak absorbing medium, and domestic and international result of study shows, in conventional microwave heating process, can only heat the oil reservoir within the scope of 5 meters, near wellbore zone, cannot heat farther wider oil reservoir; And the present invention adopts the continuous manually vertical and level of horizontal segment to make seam, and to implantation silicon carbide particle in crack as fracture support agent, effectively can improve the microwave absorbability of oil reservoir, in microwave heating process, the crack extending to oil reservoir depths near upper level well shaft is due to the heat transfer of silicon-carbide particle and intensification, form a rule high-temperature heat-conductive passage and extend to oil reservoir depths, thus realize the heating of deep on a large scale that plane is greater than 40 meters of radiuses and longitudinally covers whole core intersection.
(2) silicon-carbide particle has high temperature resistant, stable chemical performance, hardness large (Mohs' hardness is 9.5 grades, be only second to diamond), heat conductivility is good, can the advantage such as anti-oxidant when shock resistance, high temperature, using silicon-carbide particle as making seam proppant, high-temperature carborundum crack passage of heat can be formed for a long time, the large-scale oil reservoir of heating continued viscosity reduction crude oil, improve the mobile performance in crude oil downward gravity drainage process, realize long stable high yield.
(3) employing injects light paraffins solvent continuously from upper water horizontal well, owing to producing longitudinal gravitational differentiation with the density contrast of crude oil after solvent injects, solvent continues upwards to expand along vertical fractures, continues extending transversely along horizontal fracture, thus forms the solvent chamber constantly increased; On surface, solvent chamber, solvent rapid solution further viscosity reduction high temperature quick extraction is carried out to viscous crude in crude oil, the viscous crude component extracted flows into lower horizontal well (producing well) together along with solvent, thus, and can Accelerate solvent extraction, fast gravity drainage and high-speed production; Meanwhile, the viscous crude component except asphalt residue all can solvent extraction extraction, and therefore recovery ratio is high, usually can reach more than 80%.
(4) keep lower injection production pressure difference between injection-production well, be conducive to solvent chamber upwards with extending transversely, evade solvent directly under scurry into lower horizontal producing well, can effectively avoid solvent inefficient cycle.
(5) solvent of extraction can refill in oil reservoir through simple separation on ground, and therefore solvent utilization rate is high, and ton oil running cost is low, good in economic efficiency.
The foregoing is only the schematic detailed description of the invention of the present invention, and be not used to limit scope of the present invention.Appoint and watch those skilled in the art, equivalent variations done under the prerequisite not departing from design of the present invention and principle and amendment, all should belong to the scope of protection of the invention.
Claims (7)
1. an exploitation method for microwave radiation technology solvent extraction viscous crude, described exploitation method comprises the following steps:
(1) horizontal flooding pattern is set in heavy crude reservoir production zone; Described horizontal flooding pattern comprises at least one pair of horizontal well pair; Described horizontal well to by vertical plane same in oil reservoir be upper-lower position arrange a bite solvent Injection Well and a bite producing well form, described solvent Injection Well is upper water horizontal well, and described producing well is lower horizontal well;
(2) utilize the continuous fracturing technique of horizontal well horizontal segment to carry out level at horizontal segment and the oil reservoir correspondence position of upper water horizontal well to make to stitch and make seam with vertical;
(3) to implantation silicon carbide particle in horizontal fracture and vertical fracture as high-temperature heat-transfer medium;
(4) at upper water horizontal well well head part administration microwave generator, enter to connect the microwave ingress pipe of described microwave generator under in the horizontal well of top, this microwave ingress pipe extends to the horizontal segment tiptoe of upper water horizontal well, and the microwave ingress pipe of the horizontal segment of described upper water horizontal well evenly arranges Microwave emission hole;
(5) open microwave generator, the horizontal segment of monitoring upper water horizontal well along journey variations in temperature, and regulates microwave generator power according to along journey variations in temperature;
(6) light paraffins solvent is injected continuously to described upper water horizontal well;
(7) lower horizontal producing well recovers the oil continuously;
The oil reservoir that described horizontal flooding pattern is greater than 15m at individual layer effective thickness is laid;
In described step (1), the horizontal segment of upper water horizontal well is positioned at oil reservoir top or middle part, the horizontal segment of described lower horizontal well to be positioned at bottom oil reservoir and distance oil reservoir bottom interface 1 ~ 2m, vertical distance between the horizontal segment of described upper water horizontal well and the horizontal segment of described lower horizontal well is 5 ~ 6m, and the horizontal section length of described upper water horizontal well and the horizontal section length of lower horizontal well are more than 600m;
In described step (2), the continuous pressure break of upper water horizontal well produces in vertical fracture process, and the fracture length to downward-extension is no more than the vertical distance between the horizontal segment of described upper water horizontal well and the horizontal segment of described lower horizontal well.
2. the exploitation method of microwave radiation technology solvent extraction viscous crude as claimed in claim 1, it is characterized in that: in described step (2), 6 ~ 15 vertical fractures are produced at the horizontal segment of upper water horizontal well and oil reservoir correspondence position continuous uniform pressure break, 6 ~ 15 horizontal fractures are produced at the horizontal segment of upper water horizontal well and oil reservoir correspondence position continuous uniform pressure break, described vertical fracture and horizontal fracture are at the horizontal segment of described upper water horizontal well in being crisscross arranged, and the distance between described vertical fracture and adjacent level crack is 30 ~ 60m.
3. the exploitation method of microwave radiation technology solvent extraction viscous crude as claimed in claim 1, it is characterized in that: in described step (3), the granularity of silicon-carbide particle is 8 ~ 20 orders, and the injecting program of silicon-carbide particle is: 1. first in crack, inject prepad fluid; 2. utilize pressure break load fluid to carry silicon-carbide particle and inject crack, as fracture support agent; 3. inject displacement fluid and silicon-carbide particle and load fluid are clamp-oned depths, crack; 4. recycle pressure break load fluid and carry silicon-carbide particle injects near wellbore zone crack as fracture support agent, make silicon-carbide particle near wellbore zone to continuous distributed in the fracturing fracture of oil reservoir depths.
4. the exploitation method of microwave radiation technology solvent extraction viscous crude as claimed in claim 1, it is characterized in that: in described step (5), 6 ~ 20 thermocouples are disposed, for regulating the power of microwave generator along journey variations in temperature according to variations in temperature in the horizontal segment pit shaft of upper water horizontal well described in timely monitor at the horizontal segment interval of described upper water horizontal well.
5. the exploitation method of microwave radiation technology solvent extraction viscous crude as claimed in claim 4, is characterized in that: described thermocouple is disposed on the thermocouple cable that is connected with ground control unit; When the average temperature of described upper level well horizontal segment annular space rises to more than 250 DEG C, lower microwave generator power, until the average temperature of horizontal segment annular space drops to 200 ~ 220 DEG C; When the average temperature of described upper level well horizontal segment annular space drops to below 150 DEG C, raise microwave generator power, until the average temperature of horizontal segment annular space rises to 200 ~ 220 DEG C.
6. the exploitation method of microwave radiation technology solvent extraction viscous crude as claimed in claim 1, it is characterized in that: in described step (6), the alkane solvent of described light paraffins solvent to be carbon number be C3, C4, C5, C6, C7 or C8, or the mixture being their wherein two or more solvents; The injection rate of described light paraffins solvent is 100 ~ 300m3/ days; The average injection pressure 0.3 ~ 0.7MPa higher than the average discharge opeing pressure of lower horizontal well annular space of described upper level well horizontal segment annular space.
7. the exploitation method of microwave radiation technology solvent extraction viscous crude as claimed in claim 1, it is characterized in that: in described step (7), described lower horizontal well adopts the mode of blowing or artificial lift to recover the oil continuously; The solvent of extraction is injected by surface separation Posterior circle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310131948.6A CN103244089B (en) | 2013-04-16 | 2013-04-16 | The exploitation method of microwave radiation technology solvent extraction viscous crude |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310131948.6A CN103244089B (en) | 2013-04-16 | 2013-04-16 | The exploitation method of microwave radiation technology solvent extraction viscous crude |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103244089A CN103244089A (en) | 2013-08-14 |
| CN103244089B true CN103244089B (en) | 2015-09-09 |
Family
ID=48923930
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310131948.6A Active CN103244089B (en) | 2013-04-16 | 2013-04-16 | The exploitation method of microwave radiation technology solvent extraction viscous crude |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103244089B (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015077213A2 (en) * | 2013-11-20 | 2015-05-28 | Shell Oil Company | Steam-injecting mineral insulated heater design |
| CN104405348B (en) * | 2014-10-27 | 2017-01-11 | 中国石油天然气股份有限公司 | Solvent reinforcement method for communicating between horizontal wells |
| CN104563981B (en) * | 2014-12-26 | 2017-12-01 | 中国石油天然气股份有限公司 | A kind of casing programme and method of viscous crude and super-heavy oil deposit underground modification exploitation |
| CN105062460B (en) * | 2015-08-12 | 2018-05-18 | 沈阳化工大学 | A kind of method that insulative sidewall using useless electrolytic cell prepares petroleum propping agent |
| CN106978998B (en) * | 2017-04-12 | 2020-10-02 | 西南石油大学 | Method for exploiting oil gas from underground oil shale |
| CN107401397B (en) * | 2017-09-07 | 2019-11-08 | 中国石油天然气股份有限公司 | The method for communicating of dual horizontal well |
| CN107575191A (en) * | 2017-09-29 | 2018-01-12 | 中国石油大学(华东) | A kind of method of foam Assisted Gravity Drainage |
| CN108915654A (en) * | 2018-08-02 | 2018-11-30 | 西南石油大学 | Thickened oil recovery method and system |
| CN111594119B (en) * | 2020-06-30 | 2022-04-29 | 西南石油大学 | Method for producing oil shale through microwave step-down in-situ heating |
| CN111594118B (en) * | 2020-06-30 | 2022-04-19 | 西南石油大学 | Electromagnetic heating method for improving recovery ratio of thickened oil |
| CN113062720A (en) * | 2021-04-11 | 2021-07-02 | 西安物华巨能***器材有限责任公司 | Shaft structure and well-free type coal underground gasification ignition system and method applying shaft structure |
| CN114718532B (en) * | 2022-03-10 | 2023-04-25 | 西南石油大学 | Method for exploiting deep thick oil by in-situ modification of thick oil assisted by catalytic heating |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1252486A (en) * | 1999-11-22 | 2000-05-10 | 丁焰 | Petroleum recovering method and equipment through microwave cracking into light hydrocarbon |
| CN2753878Y (en) * | 2004-12-03 | 2006-01-25 | 陈列 | Microwave crude oil heating viscosity-reducing apparatus |
| CA2704689A1 (en) * | 2009-05-20 | 2010-11-20 | Conocophillips Company | In-situ upgrading of heavy crude oil in a production well using radio frequency or microwave radiation and a catalyst |
| CN102261238A (en) * | 2011-08-12 | 2011-11-30 | 中国石油天然气股份有限公司 | Method and simulated experiment system for mining oil gas by heating underground oil shale with microwave |
| CN102628350A (en) * | 2012-04-20 | 2012-08-08 | 中国石油天然气股份有限公司 | Propane-injecting shallow heavy oil reservoir exploitation method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8720547B2 (en) * | 2008-09-26 | 2014-05-13 | Conocophillips Company | Process for enhanced production of heavy oil using microwaves |
-
2013
- 2013-04-16 CN CN201310131948.6A patent/CN103244089B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1252486A (en) * | 1999-11-22 | 2000-05-10 | 丁焰 | Petroleum recovering method and equipment through microwave cracking into light hydrocarbon |
| CN2753878Y (en) * | 2004-12-03 | 2006-01-25 | 陈列 | Microwave crude oil heating viscosity-reducing apparatus |
| CA2704689A1 (en) * | 2009-05-20 | 2010-11-20 | Conocophillips Company | In-situ upgrading of heavy crude oil in a production well using radio frequency or microwave radiation and a catalyst |
| CN102261238A (en) * | 2011-08-12 | 2011-11-30 | 中国石油天然气股份有限公司 | Method and simulated experiment system for mining oil gas by heating underground oil shale with microwave |
| CN102628350A (en) * | 2012-04-20 | 2012-08-08 | 中国石油天然气股份有限公司 | Propane-injecting shallow heavy oil reservoir exploitation method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103244089A (en) | 2013-08-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103244089B (en) | The exploitation method of microwave radiation technology solvent extraction viscous crude | |
| CN102900415B (en) | Method for mining deep and ultra-deep thick oil pools by using double horizontal well fire flooding drainage | |
| CN103225497B (en) | Exploitation method of vaporizing formation water and displacing heavy oil by microwaves in situ | |
| CN102628350B (en) | Propane-injecting shallow heavy oil reservoir exploitation method | |
| CN102587880B (en) | Oil extraction method | |
| CN102678096B (en) | Hot water assisted gravity drainage method for mining high pour-point oil deposit | |
| CN105649588B (en) | Utilize the method for SAGD production of heavy oil reservoir | |
| CN103233713B (en) | Method and process for extracting shale oil gas through oil shale in situ horizontal well fracture chemical destructive distillation | |
| CN104453805B (en) | A kind of heavy crude reservoir SAGD quick start method | |
| CN105863569A (en) | Single-well fracture gravity self-circulation dry-hot-rock geotherm mining method | |
| CN105971576B (en) | The method of horizontal well fireflood assisted gravity drainage pattern exploitation special thick oil, super-viscous oil | |
| CN103291244A (en) | Method for compensating thermal energy of horizontal well mining heavy oil reservoirs in large power and subsection mode in pit | |
| CN105422068A (en) | Method for developing heavy oil reservoir of horizontal well by combining staged volume fracturing and fracturing filling | |
| CN105840146A (en) | Method for self-circulation exploitation of geothermal energy of hot dry rock with multilateral well and volume fracturing technologies | |
| CN102747997A (en) | Fire-flooding exploitation method used in later period of steam assisted gravity drainage (SAGD) of heavy oil reservoir | |
| RU2436943C1 (en) | Procedure for extraction of high viscous oil from deviating hole by method of steam cyclic pumping into reservoir | |
| RU2539048C2 (en) | In-situ combustion method (versions) | |
| CN106593368B (en) | A kind of preprocess method improving SAGD development effectiveness | |
| CN103321618A (en) | Oil shale in-situ mining method | |
| CN108131124A (en) | A kind of method using solvent and superheated steam assisted gravity drainage | |
| CA2820705A1 (en) | Sagd control in leaky reservoirs | |
| WO2013006660A2 (en) | Method for hydrocarbon recovery using sagd and infill wells with rf heating | |
| CN112983371A (en) | Method for extracting oil shale by coupling thermal fluid and thermal fluid coupling catalyst between same well seams of horizontal well | |
| CN109736763A (en) | A kind of high-temperature gas auxiliary eddy current heating device and eddy heating for heating method | |
| CN105041282A (en) | Horizontal well staged fracturing and steam huff-puff method for medium-low permeability heavy oil reservoir |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |