CN103334724A - Method and well pattern structure for mining oil deposit with nano magnetofluid displacement - Google Patents
Method and well pattern structure for mining oil deposit with nano magnetofluid displacement Download PDFInfo
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- CN103334724A CN103334724A CN201310217165XA CN201310217165A CN103334724A CN 103334724 A CN103334724 A CN 103334724A CN 201310217165X A CN201310217165X A CN 201310217165XA CN 201310217165 A CN201310217165 A CN 201310217165A CN 103334724 A CN103334724 A CN 103334724A
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Abstract
The invention discloses a method and a well pattern structure for mining an oil deposit with nano magnetofluid displacement. The method comprises the steps that an injection well, four edge wells and four corner wells form a square inverted nine-spot displacement well group; electromagnets are put into shafts of the edge wells and the corner wells; a nano magnetofluid dispersion solution is injected into the injection well; the electromagnets under the edge wells are started; a magnetic flux is adjusted; the electromagnets under the edge wells are closed; oil flow production is started; the electromagnets under the corner wells are started; a magnetic flux is adjusted; the electromagnets under the corner wells are closed; the oil flow production is started; the electromagnets under the edge wells are started; the magnetic flux is adjusted; and the edge wells and the corner wells alternately apply an electromagnetic field and alternately conduct the oil flow production for a certain period according to the sequence. The method for mining the oil deposit with the nano magnetofluid displacement changes an oil displacement direction and a speed of a nano magnetofluid in an oil layer by adopting the alternate magnetic field and an alternate production mode of the corner wells and the edge wells, so that crude oil between injection and production wells is used effectively, the sweep efficiency of an injection medium is improved, and a recovery ratio of the crude oil in the oil deposit is increased.
Description
Technical field
The invention relates to the exploitation method of thin oil and heavy crude reservoir in the field of petroleum exploitation, relate in particular to a kind of method and well pattern structure thereof of nanometer magnetofluid displacement exploitation oil reservoir.
Background technology
The based on crude viscosity criteria for classifying, worldwide oil reservoir can be divided into two big classes, i.e. ligh-oil reservoir and heavy crude reservoir, and wherein, heavy crude reservoir refers to that degassed crude viscosity is greater than the oil reservoir more than 100 centipoises under reservoir condition, all the other then are ligh-oil reservoir.
Ligh-oil reservoir adopts the water drive exploitation usually, according to incompletely statistics, by the end of the year 2012, China's ligh-oil reservoir has generally entered high moisture and ultra-high water cut stage, comprehensive water cut generally reaches more than 85%, but average recovery percent of reserves is less than 40%, and it is limited to further raising waterflood recovery efficiency factor effect that the water drive height of water drive formation for many years oozes passage.
Heavy crude reservoir adopts steam injection to handle up or steam drive development usually, steam soak has the cycle, and to inject quantity of steam little, long with adopting the phase, cycle gas oil ratio height, advantage such as good in economic efficiency, but in the steam soak development process, because underground viscosity of crude height, the resistance that the steam of injection oil reservoir is subjected to high viscosity oil is bigger, makes steam be difficult to enter the oil reservoir deep and heats large-scale oil reservoir, therefore, heavy crude reservoir steam soak heating is with to employ radius little, be difficult to reserves between well are effectively employed, the steam soak recovery ratio is lower, usually less than 20%.Steam flooding technology is usually as the substituted technique behind the steam soak, but the steam flooding field test shows both at home and abroad, because steam vapour is scurried seriously, and effectively development degree is on the low side, and gas oil ratio is lower, economic benefit is relatively poor in the steam injection process.
Along with constantly riseing of domestic and international energy demand, how further to improve oil recovery, prolong the oil field effective production time, very important to Chinese energy safety, need research and development a new generation badly and can significantly improve oil reservoir production technique recovery ratio, economical and efficient.
Thus, the inventor relies on experience and the practice of being engaged in relevant industries for many years, proposes a kind of method and well pattern structure thereof of nanometer magnetofluid displacement exploitation oil reservoir, to overcome the defective of prior art.
Summary of the invention
The object of the present invention is to provide a kind of method and well pattern structure thereof of nanometer magnetofluid displacement exploitation oil reservoir, to improve oil recovery.
The object of the present invention is achieved like this, a kind of method of nanometer magnetofluid displacement exploitation oil reservoir, and the method for described exploitation oil reservoir may further comprise the steps:
(1) in the oil reservoir zone, well pattern is set; Comprise at least one displacement well group in the described well pattern; Described displacement well group comprises an injection well, on the square centered by injecting well by this, four end holes and four corner wells is set, and described end hole and corner well are producing well, form anti-9 the displacement well groups of square by above-mentioned injection well, end hole and corner well;
(2) described injection well is adopted the usual manner completion; Described end hole and corner well are adopted nanometer magnetofluid displacement flow string structure completion;
(3) in the pit shaft of described end hole and corner well, be lowered to electromagnet;
(4) inject the nanometer magnetofluid dispersion soln to injecting into well;
(5) start end hole downhole electromagnetic body and regulate magnetic flux;
(6) close end hole downhole electromagnetic body and begin the end hole oil flow production, start corner well downhole electromagnetic body simultaneously and regulate magnetic flux;
(7) close corner well downhole electromagnetic body and begin the corner well oil flow production, restart end hole downhole electromagnetic body simultaneously and regulate magnetic flux;
(8) by the step that hockets cycle time (6) and step (7), to realize the producing well oil flow production.
In a preferred embodiments of the present invention, in described step (1), described producing well is the new peupendicular hole that bores in the oil reservoir zone; Described injection well is a peupendicular hole of new brill in the oil reservoir zone or the original old well of a bite in the employing oil reservoir zone.
In a preferred embodiments of the present invention, in described step (2), described injection well adopts the conventional cannula completion, and this conventional cannula is provided with a plurality of preforation tunnels in the position of corresponding target oil reservoir; Described end hole and corner well adopt the porcelain bushing completion in corresponding target oil reservoir position, the porcelain bushing upper end adopts box cupling to be connected with the top layer protective casing of its top, and described porcelain bushing is provided with a plurality of preforation tunnels; Electromagnet in end hole and the corner well well is tightly connected by electromagnet seating nipple and well head separately, and this electromagnet seating nipple is used in the well insulation and transmits electric energy; In described injection well shaft, be provided for injecting the injection string of nanometer magnetofluid dispersion soln, described injection string is connected and composed by the conventional box cupling oil pipe of the ceramic oil pipe that is positioned at target oil reservoir position and ceramic oil pipe top, the bottom of conventional box cupling oil pipe is positioned at the top of target oil reservoir, and the bottom of ceramic oil pipe extends to the bottom of target oil reservoir; In described injection well, end hole and corner well pit shaft, be lowered to pressure sensor to the middle part of target oil reservoir.
In a preferred embodiments of the present invention, in described step (1), in the zone of injecting between well and the producing well, select a bite or many mouthfuls of old wells as monitor well; Described this monitor well recompletion, its completion mode is identical with the completion mode of end hole and corner well; In described monitor well pit shaft, be lowered to conventional box cupling oil pipe to target oil reservoir bottom, and in the box cupling oil pipe, be lowered to downhole sampler, be used for regularly from bottom-hole sampling and assay nanometer magnetofluid volumetric concentration.
In a preferred embodiments of the present invention, in described step (3), the maximum flux intensity of described electromagnet is 15 teslas, can enough produce enough magnetic field forces and be drawn into nanometer magnetofluid in the oil reservoir porous media.
In a preferred embodiments of the present invention, in described step (4), described nanometer magnetofluid dispersion soln is made of the magnetic nanoparticle that is mixed in the base fluid, described magnetic nanoparticle particle diameter is 20～100nm, described magnetic nanoparticle is mixed in the base fluid after being wrapped up by surfactant, described base fluid is polymer solution, and described polymer concentration is 2000-3000mg/L.
In a preferred embodiments of the present invention, the magnetic fluid volumetric concentration of described magnetic nanoparticle in base fluid reaches more than 30%.
In a preferred embodiments of the present invention, described surfactant is hydrophilic surfactant active, lipophilic surfactant or non-ionic surface active agent.
In a preferred embodiments of the present invention, in described step (8), be 60～80 days described cycle time; Particularly, when step (6) is produced 60～80 days, stop to continue to produce, begin to change step (7); When step (7) is produced 60～80 days, stop to continue to produce, begin to change step (6); So alternately.
In a preferred embodiments of the present invention, described oil reservoir comprises ligh-oil reservoir and heavy crude reservoir; Described oil reservoir zone is for oil reservoir newly developed or developed oil reservoir.
Purpose of the present invention can also realize like this, a kind of well pattern structure of nanometer magnetofluid displacement exploitation oil reservoir, and described well pattern is arranged in this oil reservoir zone, comprises at least one displacement well group in the described well pattern; Described displacement well group comprises an injection well, on the square centered by injecting well by this, four end holes and four corner wells is set, and described end hole and corner well are producing well, form anti-9 the displacement well groups of square by above-mentioned injection well, end hole and corner well; Described injection well adopts the conventional cannula completion, and this conventional cannula is provided with a plurality of preforation tunnels in the position of corresponding target oil reservoir; Described end hole and corner well adopt the porcelain bushing completion in corresponding target oil reservoir position, the porcelain bushing upper end adopts box cupling to be connected with the top layer protective casing of its top, and described porcelain bushing is provided with a plurality of preforation tunnels; Be lowered to electromagnet by the electromagnet seating nipple in described end hole and the corner well well; In described injection well shaft, be provided for injecting the injection string of nanometer magnetofluid dispersion soln, described injection string is connected and composed by the conventional box cupling oil pipe of the ceramic oil pipe that is positioned at target oil reservoir position and ceramic oil pipe top, the bottom of conventional box cupling oil pipe is positioned at the top of target oil reservoir, and the bottom of ceramic oil pipe extends to the bottom of target oil reservoir; In described injection well, end hole and corner well pit shaft, be lowered to pressure sensor to the middle part of target oil reservoir.
In a preferred embodiments of the present invention, described producing well is the new peupendicular hole that bores in the oil reservoir zone; Described injection well is a peupendicular hole of new brill in the oil reservoir zone or the original old well of a bite in the employing oil reservoir zone.
In a preferred embodiments of the present invention, in the zone of injecting between well and the producing well, select a bite or many mouthfuls of old wells as monitor well; Described this monitor well recompletion, its completion mode is identical with the completion mode of end hole and corner well; In described monitor well pit shaft, be lowered to conventional box cupling oil pipe to target oil reservoir bottom, and in the box cupling oil pipe, be lowered to downhole sampler.
From the above mentioned, the method of nanometer magnetofluid displacement exploitation oil reservoir of the present invention, be to adopt anti-9 the displacement well groups of square, in end hole and corner well pit shaft, be lowered to the electromagnet with high magnetic flux intensity, inject into well a certain amount of polymer-based nano magnetic fluid dispersion soln by the surfactant parcel of injection to the center, well injects in closing center then, start end hole downhole electromagnetic body and regulate magnetic flux, make it in the target oil reservoir, form a huge magnetic field, the nanometer magnetofluid that injects oil reservoir is magnetized, and be subjected to coming from the powerful attraction of described end hole shaft bottom electromagnet, nanometer magnetofluid is under attraction force acts, inject the well near wellbore zone from described center and spread migration at the bottom of the side producer to the periphery, drive crude oil and near producing well (end hole) shaft bottom, form the former oil accumulation of certain pressure difference, when described crude oil aggregate amount acquires a certain degree, close end hole well downhole electromagnetic body and begin oil flow production, open corner well downhole electromagnetic body simultaneously, the oil reservoir middle part nanometer magnetofluid far away apart from the end hole shaft bottom coming under the effect of corner well magnetic field, main stream line deflects, nanometer magnetofluid begins toward the migration of corner well direction and drives and sweep oil reservoir crude oil on the way, when near described crude oil when aggregate amount acquires a certain degree the corner well shaft bottom, stop the end hole blowing and open end hole downhole electromagnetic body, close corner well downhole electromagnetic body simultaneously and begin blowing production, when corner well blowing production depleted of energy, stop the corner well blowing and open corner well downhole electromagnetic body, close end hole downhole electromagnetic body simultaneously and restart end hole blowing production; So, adopt end hole and corner well to rotate to apply magnetic field and the mode of the blowing of rotating is recovered the oil.This exploitation method can realize that the crude oil in the whole well group scope is employed fully, and the plane development degree can reach more than 90%, can effectively employ the remaining oil that conventional water drive is difficult to employ, and improves oil recovery factor.
The present invention has following beneficial effect:
(1) the present invention adopts nanometer magnetofluid as displacing medium, comes controlling magnetic field intensity size by control end hole and corner well shaft bottom electromagnet magnetic flux, can control and change moving direction and the speed of nanometer magnetofluid in oil reservoir flexibly.
(2) the present invention adopts nano level magnetic-particle, can enter nano level micro-pore venturi space and realize the deep displacement, and is therefore, except the oil reservoir that is applicable to conventional permeability, suitable equally to low-permeability oil deposit.
(3) the nanometer magnetofluid base fluid of the present invention's employing is high viscosity copolymer solution, can effectively reduce the mobility ratio difference that the differences in viscosity between crude oil and the base fluid causes, effectively suppress the high speed of injected media in oil reservoir and scurry into, improve plane development degree and production effect.
(4) the present invention adopts end hole and corner well to rotate and applies the mode of magnetic field and oil flow production, when end hole is produced, driven near sweep and gather the end hole shaft bottom crude oil by extraction by nanometer magnetofluid, and the oil reservoir middle part nanometer magnetofluid far away apart from the end hole shaft bottom coming under the effect of corner well magnetic field, main stream line deflects, nanometer magnetofluid begin toward corner well direction migration and drive sweep the oil reservoir middle part to the corner well zone oil reservoir crude oil on the way, therefore, according to nanometer magnetofluid streamline distribution in the well group as seen, this mode can will be injected well, end hole, the oil reservoir crude oil in zone is employed and the displacement extraction fully between the corner well.
(5) inverted nine-spot pattern that adopts of the present invention is with the essential difference of conventional water drive inverted nine-spot pattern, and under the magnetic field force effect that end hole and corner well replace, the nanometer magnetofluid streamline at first flows to end hole, and from an end hole extraction part; When end hole stops to produce, the oil reservoir middle part comprises near the nanometer magnetofluid the end hole, be subjected to the effect beginning of corner well magnetic field to corner well migration and displacement, therefore, this displacement mode has been Duoed a displacement process from end hole to corner well than conventional inverted nine-spot pattern water drive, is beneficial to effectively to employ to inject the crude oil reserve that fluid flow line is difficult to arrive the zone between end hole and the corner well.
(6) the present invention that adopt with surfactant reservoir rock wetability coupling as the magnetic nanoparticle inclusion enclave, can make nanometer magnetofluid in flow process, farthest the viscous crude of reservoir rock particle surface is peeled off, improve nanometer magnetofluid to the ability of sweeping of driving of viscous crude, improve the recovery ratio of handling up.
Description of drawings
The following drawings only is intended to the present invention done and schematically illustrates and explain, not delimit the scope of the invention.Wherein:
Fig. 1: be the plane distribution schematic diagram of displacement well group among the present invention;
Fig. 2: among Fig. 1 along the sectional structure schematic diagram of the displacement well group shown in the AA cutting line.
Drawing reference numeral:
Inject well 1 end hole 2 corner wells 3
Lead 62 injection strings 7 ceramic oil pipes 71
Box cupling oil pipe 72 target oil reservoirs 9
The specific embodiment
Understand for technical characterictic of the present invention, purpose and effect being had more clearly, now contrast description of drawings the specific embodiment of the present invention.
Embodiment 1
Present embodiment provides a kind of method of nanometer magnetofluid displacement exploitation oil reservoir, under reservoir condition, the degassed crude viscosity of this oil reservoir is 10 centipoises, effective permeability 15mD, belong to conventional hyposmosis ligh-oil reservoir, target oil reservoir 9 effective thickness 20m, described target oil reservoir refer to contain one or several independently during oil reservoir, the several independent oil reservoir of the some independent oil reservoir that present embodiment is developed or general exploitation when this oilfield exploitation zone; Reservoir rock is hydrophilic rock, now adopts the method for nanometer magnetofluid displacement exploitation oil reservoir that this oil reservoir is exploited.
Step 1:
In the oil reservoir zone, well pattern is set; Comprise at least one displacement well group 100 in the described well pattern; As shown in Figure 1, described displacement well group 100 comprises an injection well 1, on the square centered by injecting well 1 by this, four end holes 2 and four corner wells 3 is set, described end hole 2 and corner well 3 are producing well, form anti-9 the displacement well groups of square by above-mentioned injection well 1, end hole 2 and corner well 3;
Described oil reservoir zone is oil reservoir newly developed, also can select to have developed oil reservoir.Producing wells such as described end hole 2 and corner well 3 are the new peupendicular hole that bores in the oil reservoir zone; Described injection well 1 is a new peupendicular hole that bores in the oil reservoir zone, if select to have developed oil reservoir, injects well 1 and also can adopt the good original old well of a bite hole condition in the oil reservoir zone to substitute.If select to have developed oil reservoir exploitation, in the zone of injecting between well 1 and a plurality of producing well, can select a bite or many mouthfuls of old wells as monitor well; If exploit at oil reservoir newly developed, also monitor well can be set.
Step 2:
To injecting well 1, end hole 2 and corner well 3 completions; As shown in Figure 2, among Fig. 1 along the sectional structure schematic diagram of the described displacement well group 100 shown in the AA cutting line; Described injection well 1 adopts conventional cannula 11 completions, and this conventional cannula 11 is provided with a plurality of preforation tunnels in the position of corresponding target oil reservoir 9; Described end hole 2 and corner well 3 adopt porcelain bushing 41 completions in corresponding target oil reservoir 9 positions, porcelain bushing 41 upper ends adopt box cupling to be connected with the top layer protective casing 42 of its top, and described porcelain bushing 41 is provided with a plurality of preforation tunnels; Electromagnet 52 in end hole 2 and corner well 3 wells is tightly connected by electromagnet seating nipple 51 and well head separately, and this electromagnet seating nipple 51 is used in the well insulation and transmits electric energy; In described injection well 1 pit shaft, be provided for injecting the injection string 7 of nanometer magnetofluid dispersion soln, described injection string 7 is connected and composed by the conventional box cupling oil pipe 72 of the ceramic oil pipe 71 that is positioned at target oil reservoir position and ceramic oil pipe 71 tops, the bottom of conventional box cupling oil pipe 72 is positioned at the top of target oil reservoir 9, and the bottom of ceramic oil pipe 71 extends to the bottom of target oil reservoir 9; Be lowered to pressure sensor 61 to the middle part of target oil reservoir 9 in described injection well 1, end hole 2 and corner well 3 pit shafts, pressure sensor 61 is connected to aboveground by lead 62; Described pressure sensor 61 shells adopt the sealing of inorganic non-metallic insulating layer.
In this step, if select old well as monitor well, described monitor well recompletion, its completion mode is identical with the completion mode of end hole 2 and corner well 3; In described monitor well pit shaft, be lowered to conventional box cupling oil pipe to target oil reservoir bottom, and in the box cupling oil pipe, be lowered to downhole sampler, be used for regularly from bottom-hole sampling and assay nanometer magnetofluid volumetric concentration.
Step 3:
In end hole 2 and corner well 3 pit shafts, be lowered to electromagnet 52 by electromagnet seating nipple 51; The maximum flux intensity of described electromagnet 52 will reach 15 teslas, can enough produce enough magnetic field forces and be drawn into nanometer magnetofluid in the oil reservoir porous media.
Step 4:
Inject from described center well 1 to the target oil reservoir with 150m
3The speed of/d is injected the nanometer magnetofluid dispersion soln continuously; Described nanometer magnetofluid is by the polymer-based nano magnetic fluid dispersion soln of hydrophilic surfactant parcel, can adopt routine techniques well known in the art to prepare; Described magnetic nanoparticle particle diameter is 20～100nm, in the present embodiment, the particle diameter of magnetic nanoparticle is 20nm, described magnetic nanoparticle is mixed in the base fluid after being wrapped up by hydrophilic surfactant (as: fluorine ether acid), the magnetic fluid volumetric concentration of described magnetic fluid in base fluid reaches 35%, described base fluid is polymer solution, and described polymer concentration is 2000mg/L.
Step 5:
Start end hole 2 downhole electromagnetic bodies 52 and regulate magnetic flux to 5 teslas, make it in target oil reservoir 9, form a huge magnetic field.
Step 6:
Monitoring end hole 2 bottom pressures when bottom pressure is above greater than bottom pressure 5MPa before injecting, are closed end hole downhole electromagnetic body 52 closely, end hole 2 beginning oil flow production productions, and the maximum well head lifting rate control of individual well is at 50～60m
3/ d starts corner well 3 downhole electromagnetic bodies 52 simultaneously and regulates magnetic flux to 5 teslas.
Step 7:
With described end hole 2 and corner well 3 alternately the production cycle be decided to be 60 days, that is: when described end hole 2 is produced 60 days, close corner well 3 downhole electromagnetic bodies 52 and begin oil flow production, the maximum well head lifting rate control of described corner well 3 individual wells is at 50～60m
3/ d starts end hole 2 downhole electromagnetic bodies 52 simultaneously and regulates magnetic flux to 5 teslas, and described corner well 3 is produced after 60 days and rotated with described end hole 2, so alternately produces.
Under the same conditions, compare with conventional water drive exploitation method, present embodiment adopts the recovery ratio of nanometer magnetofluid displacement oil production method to improve 1.7 times.
From the above mentioned, the method of nanometer magnetofluid displacement exploitation oil reservoir of the present invention, be to adopt anti-9 the displacement well groups of square, in end hole and corner well pit shaft, be lowered to the electromagnet with high magnetic flux intensity, inject into well a certain amount of polymer-based nano magnetic fluid dispersion soln by the surfactant parcel of injection to the center, well injects in closing center then, start end hole downhole electromagnetic body and regulate magnetic flux, make it in the target oil reservoir, form a huge magnetic field, the nanometer magnetofluid that injects oil reservoir is magnetized, and be subjected to coming from the powerful attraction of described end hole shaft bottom electromagnet, nanometer magnetofluid is under attraction force acts, inject the well near wellbore zone from described center and spread migration at the bottom of the side producer to the periphery, drive crude oil and near producing well (end hole) shaft bottom, form the former oil accumulation of certain pressure difference, when described crude oil aggregate amount acquires a certain degree, close end hole well downhole electromagnetic body and begin oil flow production, open corner well downhole electromagnetic body simultaneously, the oil reservoir middle part nanometer magnetofluid far away apart from the end hole shaft bottom coming under the effect of corner well magnetic field, main stream line deflects, nanometer magnetofluid begins toward the migration of corner well direction and drives and sweep oil reservoir crude oil on the way, when near described crude oil when aggregate amount acquires a certain degree the corner well shaft bottom, stop the end hole blowing and open end hole downhole electromagnetic body, close corner well downhole electromagnetic body simultaneously and begin blowing production, when corner well blowing production depleted of energy, stop the corner well blowing and open corner well downhole electromagnetic body, close end hole downhole electromagnetic body simultaneously and restart end hole blowing production; So, adopt end hole and corner well to rotate to apply magnetic field and the mode of the blowing of rotating is recovered the oil.This exploitation method can realize that the crude oil in the whole well group scope is employed fully, and the plane development degree can reach more than 90%, can effectively employ the remaining oil that conventional water drive is difficult to employ, and improves oil recovery factor.
The principle of present embodiment and embodiment 1 is basic identical, and its difference is that the degassed crude viscosity of the oil reservoir viscous crude of selecting is 1000 centipoises, belongs to heavy crude reservoir under reservoir condition, target oil reservoir 9 effective thickness 30m, and reservoir rock is oil-wet rock; Now adopt the method for nanometer magnetofluid displacement exploitation oil reservoir that this oil reservoir is exploited.
Step 1:
In the oil reservoir zone, well pattern is set; Comprise at least one displacement well group 100 in the described well pattern; As shown in Figure 1, described displacement well group 100 comprises an injection well 1, on the square centered by injecting well 1 by this, four end holes 2 and four corner wells 3 is set, described end hole 2 and corner well 3 are producing well, form anti-9 the displacement well groups of square by above-mentioned injection well 1, end hole 2 and corner well 3;
Described oil reservoir zone is oil reservoir newly developed, also can select to have developed oil reservoir.Producing wells such as described end hole 2 and corner well 3 are the new peupendicular hole that bores in the oil reservoir zone; Described injection well 1 is a new peupendicular hole that bores in the oil reservoir zone, if select to have developed oil reservoir, injects well 1 and also can adopt the good original old well of a bite hole condition in the oil reservoir zone to substitute.If select to have developed oil reservoir exploitation, in the zone of injecting between well 1 and a plurality of producing well, can select a bite or many mouthfuls of old wells as monitor well; If exploit at oil reservoir newly developed, also monitor well can be set.
Step 2:
To injecting well 1, end hole 2 and corner well 3 completions; As shown in Figure 2, among Fig. 1 along the sectional structure schematic diagram of the described displacement well group 100 shown in the AA cutting line; Described injection well 1 adopts conventional cannula 11 completions, and this conventional cannula 11 is provided with a plurality of preforation tunnels in the position of corresponding target oil reservoir 9; Described end hole 2 and corner well 3 adopt porcelain bushing 41 completions in corresponding target oil reservoir 9 positions, porcelain bushing 41 upper ends adopt box cupling to be connected with the top layer protective casing 42 of its top, and described porcelain bushing 41 is provided with a plurality of preforation tunnels; Electromagnet 52 in end hole 2 and corner well 3 wells is tightly connected by electromagnet seating nipple 51 and well head separately, and this electromagnet seating nipple 51 is used in the well insulation and transmits electric energy; In described injection well 1 pit shaft, be provided for injecting the injection string 7 of nanometer magnetofluid dispersion soln, described injection string 7 is connected and composed by the conventional box cupling oil pipe 72 of the ceramic oil pipe 71 that is positioned at target oil reservoir position and ceramic oil pipe 71 tops, the bottom of conventional box cupling oil pipe 72 is positioned at the top of target oil reservoir 9, and the bottom of ceramic oil pipe 71 extends to the bottom of target oil reservoir 9; Be lowered to pressure sensor 61 to the middle part of target oil reservoir 9 in described injection well 1, end hole 2 and corner well 3 pit shafts, pressure sensor 61 is connected to aboveground by lead 62; Described pressure sensor 61 shells adopt the sealing of inorganic non-metallic insulating layer.
In this step, if select old well as monitor well, described monitor well recompletion, its completion mode is identical with the completion mode of end hole 2 and corner well 3; In described monitor well pit shaft, be lowered to conventional box cupling oil pipe to target oil reservoir bottom, and in the box cupling oil pipe, be lowered to downhole sampler, be used for regularly from bottom-hole sampling and assay nanometer magnetofluid volumetric concentration.
Step 3:
In end hole 2 and corner well 3 pit shafts, be lowered to electromagnet 52 by electromagnet seating nipple 51; The maximum flux intensity of described electromagnet 52 will reach 15 teslas, can enough produce enough magnetic field forces and be drawn into nanometer magnetofluid in the oil reservoir porous media.
Step 4:
Inject from described center well 1 to the target oil reservoir with 210m
3The speed of/d is injected the nanometer magnetofluid dispersion soln continuously; Described nanometer magnetofluid is by the polymer-based nano magnetic fluid dispersion soln of lipophilic surfactant parcel, can adopt routine techniques well known in the art to prepare; Described magnetic nanoparticle particle diameter is 20～100nm, in the present embodiment, the particle diameter of magnetic nanoparticle is 50nm, described magnetic nanoparticle is mixed in the base fluid after being wrapped up by lipophilic surfactant (as: oleic acid), the magnetic fluid volumetric concentration of described magnetic fluid in base fluid reaches 40%, described base fluid is polymer solution, and described polymer concentration is 3000mg/L.
Step 5:
Start end hole 2 downhole electromagnetic bodies 52 and regulate magnetic flux to 10 teslas, make it in target oil reservoir 9, form a huge magnetic field.
Step 6:
Monitoring end hole 2 bottom pressures when bottom pressure is above greater than bottom pressure 7MPa before injecting, are closed end hole downhole electromagnetic body 52 closely, end hole 2 beginning oil flow production productions, and the maximum well head lifting rate control of individual well is at 70～80m
3/ d starts corner well 3 downhole electromagnetic bodies 52 simultaneously and regulates magnetic flux to 10 teslas.
Step 7:
With described end hole 2 and corner well 3 alternately the production cycle be decided to be 80 days, that is: when described end hole 2 is produced 80 days, close corner well 3 downhole electromagnetic bodies 52 and begin oil flow production, the maximum well head lifting rate control of described corner well 3 individual wells is at 70～80m
3/ d starts end hole 2 downhole electromagnetic bodies 52 simultaneously and regulates magnetic flux to 10 teslas, and described corner well 3 is produced after 80 days and rotated with described end hole 2, so alternately produces.
Under the same conditions, compare with conventional water drive exploitation method, present embodiment adopts the recovery ratio of nanometer magnetofluid displacement oil production method to improve 2.6 times.
The present invention has following beneficial effect:
(1) the present invention adopts nanometer magnetofluid as displacing medium, comes controlling magnetic field intensity size by control end hole and corner well shaft bottom electromagnet magnetic flux, can control and change moving direction and the speed of nanometer magnetofluid in oil reservoir flexibly.
(2) the present invention adopts nano level magnetic-particle, can enter nano level micro-pore venturi space and realize the deep displacement, and is therefore, except the oil reservoir that is applicable to conventional permeability, suitable equally to low-permeability oil deposit.
(3) the nanometer magnetofluid base fluid of the present invention's employing is that high-viscosity polymer is as the carrier base fluid, can effectively reduce the mobility ratio difference that the differences in viscosity between crude oil and the base fluid causes, effectively suppress the high speed of injected media in oil reservoir and scurry into, improve plane development degree and production effect.
(4) the present invention adopts end hole and corner well to rotate and applies the mode of magnetic field and oil flow production, when end hole is produced, driven near sweep and gather the end hole shaft bottom crude oil by extraction by nanometer magnetofluid, and the oil reservoir middle part nanometer magnetofluid far away apart from the end hole shaft bottom coming under the effect of corner well magnetic field, main stream line deflects, nanometer magnetofluid begin toward corner well direction migration and drive sweep the oil reservoir middle part to the corner well zone oil reservoir crude oil on the way, therefore, according to nanometer magnetofluid streamline distribution in the well group as seen, this mode can will be injected well, end hole, the oil reservoir crude oil in zone is employed and the displacement extraction fully between the corner well.
(5) inverted nine-spot pattern that adopts of the present invention is with the essential difference of conventional water drive inverted nine-spot pattern, and under the magnetic field force effect that end hole and corner well replace, the nanometer magnetofluid streamline at first flows to end hole, and from an end hole extraction part; When end hole stops to produce, the oil reservoir middle part comprises near the nanometer magnetofluid the end hole, be subjected to the effect beginning of corner well magnetic field to corner well migration and displacement, therefore, this displacement mode has been Duoed a displacement process from end hole to corner well than conventional inverted nine-spot pattern water drive, is beneficial to effectively to employ to inject the crude oil reserve that fluid flow line is difficult to arrive the zone between end hole and the corner well.
(6) the present invention that adopt with surfactant reservoir rock wetability coupling as the magnetic nanoparticle inclusion enclave, can make nanometer magnetofluid in flow process, farthest the viscous crude of reservoir rock particle surface is peeled off, improve nanometer magnetofluid to the ability of sweeping of driving of viscous crude, improve the recovery ratio of handling up.
The above only is the schematic specific embodiment of the present invention, is not in order to limit scope of the present invention.Any those skilled in the art, the equivalent variations of having done under the prerequisite that does not break away from design of the present invention and principle and modification all should belong to the scope of protection of the invention.
Claims (13)
1. the method for nanometer magnetofluid displacement exploitation oil reservoir, the method for described exploitation oil reservoir may further comprise the steps:
(1) in the oil reservoir zone, well pattern is set; Comprise at least one displacement well group in the described well pattern; Described displacement well group comprises an injection well, on the square centered by injecting well by this, four end holes and four corner wells is set, and described end hole and corner well are producing well, form anti-9 the displacement well groups of square by above-mentioned injection well, end hole and corner well;
(2) described injection well is adopted the usual manner completion; Described end hole and corner well are adopted nanometer magnetofluid displacement flow string structure completion;
(3) in the pit shaft of described end hole and corner well, be lowered to electromagnet;
(4) inject the nanometer magnetofluid dispersion soln to injecting into well;
(5) start end hole downhole electromagnetic body and regulate magnetic flux;
(6) close end hole downhole electromagnetic body and begin the end hole oil flow production, start corner well downhole electromagnetic body simultaneously and regulate magnetic flux;
(7) close corner well downhole electromagnetic body and begin the corner well oil flow production, restart end hole downhole electromagnetic body simultaneously and regulate magnetic flux;
(8) by the step that hockets cycle time (6) and step (7), to realize the producing well oil flow production.
2. the method for oil reservoir is exploited in nanometer magnetofluid displacement as claimed in claim 1, it is characterized in that: in described step (1), described producing well is the new peupendicular hole that bores in the oil reservoir zone; Described injection well is a peupendicular hole of new brill in the oil reservoir zone or the original old well of a bite in the employing oil reservoir zone.
3. the method for oil reservoir is exploited in nanometer magnetofluid displacement as claimed in claim 1, it is characterized in that: in described step (2), described injection well adopts the conventional cannula completion, and this conventional cannula is provided with a plurality of preforation tunnels in the position of corresponding target oil reservoir; Described end hole and corner well adopt the porcelain bushing completion in corresponding target oil reservoir position, the porcelain bushing upper end adopts box cupling to be connected with the top layer protective casing of its top, and described porcelain bushing is provided with a plurality of preforation tunnels; Electromagnet in end hole and the corner well well is tightly connected by electromagnet seating nipple and well head separately, and this electromagnet seating nipple is used in the well insulation and transmits electric energy; In described injection well shaft, be provided for injecting the injection string of nanometer magnetofluid dispersion soln, described injection string is connected and composed by the conventional box cupling oil pipe of the ceramic oil pipe that is positioned at target oil reservoir position and ceramic oil pipe top, the bottom of conventional box cupling oil pipe is positioned at the top of target oil reservoir, and the bottom of ceramic oil pipe extends to the bottom of target oil reservoir; In described injection well, end hole and corner well pit shaft, be lowered to pressure sensor to the middle part of target oil reservoir.
4. the method for nanometer magnetofluid displacement exploitation oil reservoir as claimed in claim 3 is characterized in that: in described step (1), in the zone of injecting between well and the producing well, select a bite or many mouthfuls of old wells as monitor well; The completion mode of described this monitor well is identical with the completion mode of end hole and corner well; In described monitor well pit shaft, be lowered to conventional box cupling oil pipe to target oil reservoir bottom, and in the box cupling oil pipe, be lowered to downhole sampler, be used for regularly from bottom-hole sampling and assay nanometer magnetofluid volumetric concentration.
5. the method for oil reservoir is exploited in nanometer magnetofluid displacement as claimed in claim 1, it is characterized in that: in described step (3), the maximum flux intensity of described electromagnet is 15 teslas, can enough produce enough magnetic field forces and be drawn into nanometer magnetofluid in the oil reservoir porous media.
6. the method for oil reservoir is exploited in nanometer magnetofluid displacement as claimed in claim 1, it is characterized in that: in described step (4), described nanometer magnetofluid dispersion soln is made of the magnetic nanoparticle that is mixed in the base fluid, described magnetic nanoparticle particle diameter is 20～100nm, described magnetic nanoparticle is mixed in the base fluid after being wrapped up by surfactant, described base fluid is polymer solution, and described polymer concentration is 2000-3000mg/L.
7. the method for oil reservoir is exploited in nanometer magnetofluid displacement as claimed in claim 6, and it is characterized in that: the magnetic fluid volumetric concentration of described magnetic nanoparticle in base fluid reaches more than 30%.
8. the method for oil reservoir is exploited in nanometer magnetofluid displacement as claimed in claim 6, and it is characterized in that: described surfactant is hydrophilic surfactant active, lipophilic surfactant or non-ionic surface active agent.
9. the method for oil reservoir is exploited in nanometer magnetofluid displacement as claimed in claim 1, and it is characterized in that: in described step (8), be 60～80 days described cycle time; Particularly, when step (6) is produced 60～80 days, stop to continue to produce, begin to change step (7); When step (7) is produced 60～80 days, stop to continue to produce, begin to change step (6); So alternately.
10. the method for oil reservoir is exploited in nanometer magnetofluid displacement as claimed in claim 1, and it is characterized in that: described oil reservoir comprises ligh-oil reservoir and heavy crude reservoir; Described oil reservoir zone is for oil reservoir newly developed or developed oil reservoir.
11. the well pattern structure of a nanometer magnetofluid displacement exploitation oil reservoir, described well pattern is arranged in this oil reservoir zone, it is characterized in that: comprise at least one displacement well group in the described well pattern; Described displacement well group comprises an injection well, on the square centered by injecting well by this, four end holes and four corner wells is set, and described end hole and corner well are producing well, form anti-9 the displacement well groups of square by above-mentioned injection well, end hole and corner well; Described injection well adopts the conventional cannula completion, and this conventional cannula is provided with a plurality of preforation tunnels in the position of corresponding target oil reservoir; Described end hole and corner well adopt the porcelain bushing completion in corresponding target oil reservoir position, the porcelain bushing upper end adopts box cupling to be connected with the top layer protective casing of its top, and described porcelain bushing is provided with a plurality of preforation tunnels; Be lowered to electromagnet by the electromagnet seating nipple in described end hole and the corner well well; In described injection well shaft, be provided for injecting the injection string of nanometer magnetofluid dispersion soln, described injection string is connected and composed by the conventional box cupling oil pipe of the ceramic oil pipe that is positioned at target oil reservoir position and ceramic oil pipe top, the bottom of conventional box cupling oil pipe is positioned at the top of target oil reservoir, and the bottom of ceramic oil pipe extends to the bottom of target oil reservoir; In described injection well, end hole and corner well pit shaft, be lowered to pressure sensor to the middle part of target oil reservoir.
12. the well pattern structure of nanometer magnetofluid displacement exploitation oil reservoir as claimed in claim 11 is characterized in that: described producing well is the new peupendicular hole that bores in the oil reservoir zone; Described injection well is a peupendicular hole of new brill in the oil reservoir zone or the original old well of a bite in the employing oil reservoir zone.
13. the well pattern structure of nanometer magnetofluid displacement exploitation oil reservoir as claimed in claim 11 is characterized in that: in the zone of injecting between well and the producing well, select a bite or many mouthfuls of old wells as monitor well; The completion mode of described this monitor well is identical with the completion mode of end hole and corner well; In described monitor well pit shaft, be lowered to conventional box cupling oil pipe to target oil reservoir bottom, and in the box cupling oil pipe, be lowered to downhole sampler.
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