CN201714363U - Device for exploiting thick-layer massive thick oil by controlling fire gas injection speed - Google Patents
Device for exploiting thick-layer massive thick oil by controlling fire gas injection speed Download PDFInfo
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- CN201714363U CN201714363U CN201020169117XU CN201020169117U CN201714363U CN 201714363 U CN201714363 U CN 201714363U CN 201020169117X U CN201020169117X U CN 201020169117XU CN 201020169117 U CN201020169117 U CN 201020169117U CN 201714363 U CN201714363 U CN 201714363U
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Abstract
The utility model relates to a device for exploiting thick-layer massive thick oil by controlling fire gas injection speed. The device comprises section gas injection pipe columns arranged inside a gas injection well, and is characterized in that the section gas injection pipe columns comprise sealed pipe columns and pipe columns with perforations formed thereon; both the sealed pipe columns and the pipe columns with perforations formed thereon are arranged according to shielding position of interlayer inside the thick-layer massive thick oil layer, wherein the sealed pipe columns are arranged in the shielding position of the interlayer inside the thick-layer massive thick oil layer and the pipe columns with the perforations formed thereon are arranged inside the thick-layer thick oil layer. By adjusting individual well gas injection speed in a dynamic sectional manner and utilizing variable and lower fire gas injection speed to maintain stable and normal combustion under the condition that combustion is guaranteed, the device can improve fire wave of massive oil deposit and the volume thereof, as well as the exploitation effect and ultimate recovery factor.
Description
Technical field
The utility model relates to a kind of raising recovery efficiency technique of heavy crude reservoir, is applicable to the method for utilizing fireflood to exploit in the bigger massive oil pool of thickness to improve recovery ratio, is specifically related to a kind of device of burning the block viscous crude of gas injection speed exploitation thick-layer by control.
Background technology
Combustion in situ (In-situ combustion) is called underground combustion or layer internal combustion again, also claims fireflood extraction system (fire-flooding), is a kind of in the inner oil recovery by heating technology that produces heat of oil reservoir.It is exactly under formation condition that combustion in situ recovers the oil, with the class coke thing that is deposited in the pyrolytic reaction process on the mineral substrate is fuel, to inject airborne oxygen is combustion adjuvant, in reservoir, create a condition that can make the heat release of crude oil oxidizing fire artificially, constantly injecting under the condition of hot air, oil reservoir will burn, and forms mobile combustion zone radially, claims live wire again.The crude oil in live wire the place ahead be heated viscosity reduction, distillation, light oil after the distillation, vapour and combustion flue gas drive forwards, and the heavy ingredient that is not distilled at high temperature produces cracking, last pyrolysis product---coke acts as a fuel (account for oil in-place 10%～15%), continues burning forward to keep oil reservoir; At high temperature, the water that irreducible water in the oil reservoir and burning generate becomes water vapour, carries a large amount of heat transferred the place ahead oil reservoir, and scrub oil reservoir once more, thereby form the complex process of a multiple driving, crude oil is driven to producing well, effectively improve the recovery percent of reserves of crude oil.Combustion in situ oil displacement efficiency height, generally greater than 80%, the recovery ratio height, generally reach 50%～80%, the oil reservoir wide accommodation, very not strict to the requirement of reservoir buried depth and well pattern, therefore, the combustion in situ mode has broad application prospects in heavy oil development, is a development scheme that has more potentiality.
The combustion in situ oil recovery technique is since adopting research, and the block of worldwide carrying out the combustion in situ test has more than 300, and the domestic block of carrying out the combustion in situ test has 17.And the research of recovering the oil at combustion in situ makes certain gains.For example, a kind of fire flooding physical analogue device is disclosed in No. the 200510045110.0th, Chinese patent application, this device comprises basket, Igniting electric furnace, controller and stube cable, oversheath and flange, temperature pick up, pressure sensor, differential pressure pick-up, recover, analyzer, air compressor machine and gas flowmeter, described Igniting electric furnace, basket and temperature pick up are installed in oversheath, on the described oversheath, the lower end is installed on pressure sensor and differential pressure pick-up, the lower end is installed on recover and analyzer, is connected with air compressor machine on the described gas flowmeter.
In addition, a kind of a kind of oil reservoir fire-flooding thermal-ignition method of oilfield fire flood oil reservoir igniting usefulness is disclosed in No. the 200610134965.5th, Chinese patent application, employing activity skid-mounted type gas-vapour generator the complete sets of equipment, use high temperature, the high-pressure combustion technology, the nitrogen that diesel combustion is produced, mist such as carbon dioxide and steam and a large amount of heat energy, at gas-when vapour generator internal combustion temperature reaches 1800 ℃, water mixing cools to 300～400 ℃, pressure injects by well mouth of oil well device and injection string mist less than 25MPa to oil reservoir; Inject the mist of 300～400 ℃ of 3-10 * 10Nm, the preheating oil reservoir injects air more continuously in well, make crude oil and air generation oxidation in oil reservoir, and heat release reaches self-ignition point, burns, and realizes the purpose of the combustion in situ displacement of reservoir oil.
Though the technician has obtained the many aspects achievement in combustion in situ research, and these researchs all are confined to core intersection less than in the 38m stratiform shallow layer thick oil oil reservoir.And at the thick-layer massive oil pool, more than research is then exposing its limited applicability in various degree, sums up and gets up to be mainly reflected in the following aspects:
(1) is that can exploitation cost-effective key Design technology at the appropriate design of such oil reservoir fireflood gas injection speed, just controls rational gas injection speed and determining ultimate recovery and economic benefit.Along with the increase of core intersection, the sectional area also corresponding increase simultaneously that overdoes on live wire is vertical, excessive gas injection speed often causes economic benefit on the low side, and low excessively gas injection speed then can cause flame-out and result failure.
(2) along with the increase of core intersection, the sectional area also corresponding increase simultaneously that overdoes on live wire is vertical is especially burnt the difficulty of exploiting at intraformational bed distribution oil reservoir and constantly increase along with the increase of reservoir thickness this moment; Description difficulty along with the oil reservoir non-homogeneity increases in addition, and in-layer heterogeneity seems of crucial importance to the fireflood development scheme, therefore also needs to control rational gas injection speed.
The utility model content
In order to address the above problem, the utility model proposes a kind of device of burning the block viscous crude of gas injection speed exploitation thick-layer by control.
According to technical scheme described in the utility model, a kind of device by the block viscous crude of control baked wheaten cake gas injection speed exploitation thick-layer is included in segmentation gas injection tubing string is set in the gas injection well, it is characterized in that, described segmentation gas injection tubing string is made up of sealing tubing string and the tubing string that has perforation, the sealing tubing string is arranged on the position of blocking of the block viscous crude oil reservoir of thick-layer intraformational bed, and the tubing string that has perforation is arranged in the viscous crude oil reservoir.
Preferably, in the perforation of the tubing string that has perforation, be provided with one-way cock and controller.
More preferably, segmentation gas injection tubing string connects the source of the gas on ground, is provided with to add compression pump between source of the gas and segmentation gas injection tubing string.
Further, the controller that is provided with in the tubing string perforation is electrically connected with ground control unit, and the instruction that receives ground control unit comes the opening degree of controlling non-return valve door.
Further, ground control unit includes central control room and gas injection pressure control system.
Particularly, the gas injection pressure control system comprises by pressure compensated pump 1, gasholder 2, adjustable speed gas injection pump 3, first valve 4, first pressure display unit 5, second valve 6, the first indication gas generator 7, the first indication gas volume gauge line 8, second pressure display unit 9, micropore capillary tube 10, metering device 11, the 3rd valve 12, the second indication gas generator 13, the second indication gas volume gauge line 14, the 4th valve 15, the first indication gas recurs device 16, the 3rd indication gas volume gauge line 17, the second indication gas recurs device 18, the 4th indication gas volume gauge line 19 is formed; The port of giving vent to anger of pressure compensated pump 1 connects the first air inlet port of gasholder 2, the port of giving vent to anger of adjustable speed gas injection pump 3 connects the second air inlet port of gasholder 2, the port of giving vent to anger of gasholder 2 connects the air inlet port of first valve 4, the port of giving vent to anger of first valve 4 connects the air inlet port of first pressure display unit 5, the port of giving vent to anger of first pressure display unit 5, one end of second valve 6, one end of one end of the 3rd valve 12 and the 4th valve 15 interconnects, the another port of second valve 6 connects the air inlet port of the first indication gas generator 7, the port of giving vent to anger of the first indication gas generator 7 connects the air inlet port of the first indication gas volume gauge line 8, the port of giving vent to anger of the first indication gas volume gauge line 8 connects the air inlet port of second pressure display unit 9, the port of giving vent to anger of second pressure display unit 9 connects an end of micropore capillary tube 10, the other end of micropore capillary tube 10 connects the arrival end of metering device 11, the another port of the 3rd valve 12 connects the air inlet port of the second indication gas generator 13, the port of giving vent to anger of the second indication gas generator 13 connects the air inlet port of the second indication gas volume gauge line 14, the another port of the 4th valve 15 connects the air inlet port that the first indication gas recurs device 16, first port of giving vent to anger of indicating gas to recur device 16 connects the air inlet port of the 3rd indication gas volume gauge line 17, the port of giving vent to anger of the 3rd indication gas volume gauge line 17 connects the air inlet port that the second indication gas recurs device 18, and second port of giving vent to anger of indicating gas to recur device 18 connects the air inlet port of the 4th indication gas volume gauge line 19.
Additionally, gas injection speed and combustion thickness, oil saturation are proportional; Combustion thickness and burning time are proportional; The combustion rate of a certain concrete block unit volume oil reservoir that the crude oil composition is identical is main relevant with oil saturation, and oil saturation is low more, and combustion rate is high more.
Use device described in the utility model, fully according to the static geology characteristic of oil reservoir, the mechanism in conjunction with the combustion in situ exploitation becomes unfavorable into favourable, by artificial optimal design, can reach and improve the purpose that massive oil pool is burnt swept volume, improved combustion in situ development effectiveness and ultimate recovery.In addition, adopt device of the present utility model back gas injection well only to need less gas injection speed just can keep stable burning, reduced to cause the risk of the too early has channeling of producing well because of heavy dose of gas injection.In addition, can suitably reduce simultaneously the performance requirement of pressure fan, it is effective to burn operation safe.
Brief Description Of Drawings
Fig. 1, Fig. 2 and Fig. 3 are respectively Temperature Distribution schematic diagrames after massive oil pool is handled up;
Fig. 4 oil saturation distribution schematic diagram around the gas injection well of handling up in the process;
Fig. 5 is a combustion thickness schematic diagram in the massive oil pool combustion in situ process;
Fig. 6 is a different phase gas injection speed change curve;
What Fig. 7 was to use device of the present utility model involves the situation schematic diagram;
Fig. 8 is the schematic diagram of the gas injection pressure control system in the utility model.
The specific embodiment
Below, the utility model method is explained and illustrated.
For further setting forth the utility model is to reach technological means and the effect that expection utility model purpose is taked, below in conjunction with accompanying drawing and preferred embodiment, the back segmentation of handling up according to the block viscous crude of the thick-layer that the utility model proposes is burnt the specific embodiment, method, step, feature and the effect thereof of gas injection speed method for designing.
According to the technical solution of the utility model, the device that passes through the block viscous crude of control baked wheaten cake gas injection speed exploitation thick-layer that is proposed is included in segmentation gas injection tubing string is set in the gas injection well, it is characterized in that, described segmentation gas injection tubing string is made up of sealing tubing string and the tubing string that has perforation, sealing tubing string and have between the tubing string of perforation and to block being provided with of position according to the block viscous crude oil reservoir of thick-layer intraformational bed, the sealing tubing string is arranged on the position of blocking of the block viscous crude oil reservoir of thick-layer intraformational bed, and the tubing string that has perforation is arranged in the viscous crude oil reservoir.
Wherein, in the perforation of the tubing string that has perforation, be provided with one-way cock and controller.Further, segmentation gas injection tubing string connects the source of the gas on ground, is provided with to add compression pump between source of the gas and segmentation gas injection tubing string; The controller that is provided with in the tubing string perforation is electrically connected with ground control unit, and the instruction that receives ground control unit comes the opening degree of controlling non-return valve door.In addition, ground control unit includes central control room and gas injection pressure control system.
Particularly, Fig. 8 is the schematic diagram of the gas injection pressure control system in the utility model.The gas injection pressure control system comprises by pressure compensated pump 1, gasholder 2, adjustable speed gas injection pump 3, first valve 4, first pressure display unit 5, second valve 6, the first indication gas generator 7, the first indication gas volume gauge line 8, second pressure display unit 9, micropore capillary tube 10, metering device 11, the 3rd valve 12, the second indication gas generator 13, the second indication gas volume gauge line 14, the 4th valve 15, the first indication gas recurs device 16, the 3rd indication gas volume gauge line 17, the second indication gas recurs device 18, the 4th indication gas volume gauge line 19 is formed; The port of giving vent to anger of pressure compensated pump 1 connects the first air inlet port of gasholder 2, the port of giving vent to anger of adjustable speed gas injection pump 3 connects the second air inlet port of gasholder 2, the port of giving vent to anger of gasholder 2 connects the air inlet port of first valve 4, the port of giving vent to anger of first valve 4 connects the air inlet port of first pressure display unit 5, the port of giving vent to anger of first pressure display unit 5, one end of second valve 6, one end of one end of the 3rd valve 12 and the 4th valve 15 interconnects, the another port of second valve 6 connects the air inlet port of the first indication gas generator 7, the port of giving vent to anger of the first indication gas generator 7 connects the air inlet port of the first indication gas volume gauge line 8, the port of giving vent to anger of the first indication gas volume gauge line 8 connects the air inlet port of second pressure display unit 9, the port of giving vent to anger of second pressure display unit 9 connects an end of micropore capillary tube 10, the other end of micropore capillary tube 10 connects the arrival end of metering device 11, the another port of the 3rd valve 12 connects the air inlet port of the second indication gas generator 13, the port of giving vent to anger of the second indication gas generator 13 connects the air inlet port of the second indication gas volume gauge line 14, the another port of the 4th valve 15 connects the air inlet port that the first indication gas recurs device 16, first port of giving vent to anger of indicating gas to recur device 16 connects the air inlet port of the 3rd indication gas volume gauge line 17, the port of giving vent to anger of the 3rd indication gas volume gauge line 17 connects the air inlet port that the second indication gas recurs device 18, and second port of giving vent to anger of indicating gas to recur device 18 connects the air inlet port of the 4th indication gas volume gauge line 19.
In order to illustrate in greater detail technical scheme described in the utility model, the use technology of the device that is proposed is described with reference to the accompanying drawings.Consult Fig. 1, Fig. 2 and shown in Figure 3, Fig. 1, Fig. 2 and Fig. 3 are respectively Temperature Distribution schematic diagrames after massive oil pool was handled up in the segmentation baked wheaten cake gas injection speed method for designing after the block viscous crude of the utility model thick-layer was handled up.This method adopts the steam control oil model study distribution of remaining oil based on oil reservoir heating volume based on numerical simulation, may further comprise the steps:
(1) at the relatively poor heavy crude reservoir of initial condition current downflow ability, only after reservoir temperature rose to its flowing temperature (generally getting the inflection temperature of crude oil viscosity-temperature curve), its producing status just had clear improvement.
(2) at the block steam soak heavy crude reservoir of thick-layer, in this patent research process according to existing test, look for water blockoff, produce data such as dynamic well history, grope and contrast in conjunction with reservoir numerical simulation etc. is many-sided, proposed a kind of new production split method based on oil well heating volume.This method is based on numerical simulation, and the sticking temperature inflection temperature that reservoir temperature is surpassed underground crude oil is considered as the boundary whether oil reservoir is employed, and with the weight factor of the occupied heating volume of each substratum as production split, carries out production split thus.
This proposes the production split model of substratum:
Illustrate: N
Pi---substratum cumulative production, t
N
p---individual well stage cumulative production, t
V
i---substratum heating volume, m
3
N---penetrate out the number of plies
(3) according to field monitoring data and results of numerical simulation, but oil well heated perimeter approximate processing is: when the height of steam overlap does not reach the oil reservoir end face, the volume form of the scope of employing of oil well is similar to the cylindric of a pinnacle, its employ thickness be oil well penetrate out thickness and steam overlap thickness sum; When the height of steam overlap arrives the oil top, the volume form of the scope of employing of oil well be similar to one cylindric.
When the height of steam overlap does not reach circle, oil reservoir top
V=π r when the height of steam overlap reaches circle, oil reservoir top
2(H+h)
Illustrate: V---oil well heating volume, m
3
R---heating radius, m
H---oil well is penetrated out thickness, m
H---steam overlap height, m
(4) the combine closely seepage characteristics of heavy crude reservoir is set up based on the steam control oil pattern on the heating volume basis, takes into full account the influence of the onlap of steam to output, adopts the production split pattern based on oil well heating volume, the research remaining oil distribution.
Consult shown in Figure 4ly, Fig. 4 is that block shape oil reservoir combustion in situ process midplane remaining oil saturation schematic diagram in the gas injection speed method for designing is burnt in the block heavy crude reservoir of the utility model thick-layer back of handling up.This method is determined plane remaining oil saturation and present position air consumption, the combustion rate that appropriate design is relevant with gas injection speed based on numerical simulation.Design formulas is:
Q
a＝VA
1
Wherein: Q
aBe air consumption,
V is a combustion volume, m
3
A
1Be combustion rate, m
3/ m
3Determine combustion rate according to thing mould result and oil saturation
See also shown in Figure 5ly, Fig. 5 is that combustion thickness schematic diagram in the block shape oil reservoir combustion in situ process is burnt in the gas injection speed method for designing in the block heavy crude reservoir of the utility model thick-layer back of handling up.This method is considered the live wire onlap based on numerical simulation, rationally determines combustion thickness.
Consult shown in Figure 6ly, Fig. 6 is that combustion thickness schematic diagram in the block shape oil reservoir combustion in situ process is burnt in the gas injection speed method for designing in the block heavy crude reservoir of the utility model thick-layer back of handling up.This method is optimized sectional area and the gas injection well dynamic air-distributing technology of overdoing, the appropriate design gas injection speed based on numerical simulation.May further comprise the steps:
(1),, adopts thickness and the remaining oil saturation of determining combustion front place oil reservoir stage by stage fully realizing under the condition that live wire involves rule fully in conjunction with the scrutiny achievement of bimodulus in the block oil reservoir chamber;
(2) determine the plane remaining oil saturation, mainly rely on the digital-to-analogue result of study, determine remaining oil apart from the gas injection well diverse location
(3) the forecast combustion leading edge sectional area that overdoes, reservoir heterogeneity and remaining oil and gas injection speed best configuration relation, the dynamic segmentation formula is adjusted the individual well gas injection speed, under the prerequisite that guarantees burning, selects for use speed change, gas injection speed on the low side to keep stable normal burning.The gas injection speed design procedure is as follows:
1. determine combustion rate
Combustion rate is meant the needed air capacity of burning 1 side's oil-sand, and it is formed with oil saturation, crude oil, firing temperature is relevant, determines combustion rate according to thing mould result and oil saturation.
2. determine combustion thickness
It is relevant with burning time and steam overlap to burn leading edge place core intersection, according to the digital-to-analogue result, determines vertical combustion thickness.
3. determine gas injection speed
The gas injection speed design formulas is:
Wherein: Q
aBe air consumption, design formulas is: Q
a=VA
1
The combustion volume design formulas is: V=π (R
2-r
1 2) h ρ
Burning time, design formulas was:
r
1For the sleeve pipe outer radius, get 0.089m
H is for burning leading edge place core intersection
ρ is the vertical combustion rate, determines according to the digital-to-analogue result.
A
1Be combustion rate, m
3/ m
3Determine combustion rate according to thing mould result and oil saturation
R is the distance of combustion front apart from gas injection well, m; Determine according to the live wire fltting speed
V
fBe live wire fltting speed, m/d.
Use for reference above-mentioned design scheme, burn the gas injection speed method for designing after the block heavy crude reservoir of the utility model thick-layer is handled up and have the following advantages at least:
(1) this design is fully according to the static geology characteristic of oil reservoir, mechanism in conjunction with the combustion in situ exploitation, become unfavorable,, can reach and improve the purpose that massive oil pool is burnt swept volume, improved combustion in situ development effectiveness and ultimate recovery by artificial optimal design into favourable.
(2) gas injection well only needs less gas injection speed just can keep stable burning behind employing the design, has reduced to cause because of heavy dose of gas injection the risk of the too early has channeling of producing well.Performance requirement to pressure fan can suitably reduce simultaneously in addition, and it is effective to burn operation safe.
Six, embodiment 1
Oil field 1 is one three the monocline oil reservoirs that enclosed limit by tomography.Have that oil reservoir buries deeply, simple structure, oil reservoir be huge thick in, inner typical characteristics such as interlayer agensis.Oil reservoir buried depth 1460～1600m, core intersection 145m, remaining oil saturation is 0.45, degree of porosity is 21.6%, permeability 860md, degassed crude viscosity 4500mPa.s under the formation condition; Be developed as the master early stage to handle up, strata pressure is low at present, only is 2～3MPa, and underground water amount is big, and water recovery rate has only 30%, and remaining oil saturation is the highest by 61% between well.
(1) according to oil field geologic feature and exploitation present situation, carries out coarse screening.This oil reservoir meets the following conditions: core intersection＞30m, and thickness in monolayer accounts for 70% of gross thickness greater than the core intersection of 10m, remaining oil saturation＞0.45, degree of porosity＞0.18, permeability＞200md, degassed crude viscosity＜10000mPa.s under the formation condition, reservoir depth＜2000m;
(2) at first be the oil reservoir that steam soak is crossed, carry out the remaining oil saturation distribution and describe.According to the distribution situation of this oil reservoir every interlayer, this piece is divided into upper and lower two cover series of strata exploitations on the whole, begin to adopt " move wind start to exchange fire formula " whole development on the plane from the high-order bit.
(3) determine air consumption according to thing mould result of study and remaining oil saturation.
(4) penetrate out thickness according to gas injection well and the live wire onlap is determined combustion thickness, calculate different live wires and involve gas injection speed under the situation.
(5) adopt dry forward combustion " moving wind starts to exchange fire " formula, divide two cover series of strata fireflood exploitations, well spacing 105m, array pitch 210m; Adopt the mode gas injection of speed change gas injection, initial stage individual well gas injection speed 5000～7000m
3/ d, conversion unit cross-sectional area air flux 1.93m
3/ (m
2.h), dynamic segmentation increases gas injection speed, and the moon increases 3000～4000m
3/ d, oil well lifting rate 15～25m
3/ d, the prediction fireflood was produced 10.5, can improve recovery ratio 32%, and ultimate recovery can reach 47%.
(6) oil field 1 situ combustion technology scheme was implemented in May, 2008,6 mouthfuls of gas injection wells of last series of strata are successfully lighted successively, combustion in situ involves in order at present, vertically penetrate out at gas injection well under the situation of 10m, the core intersection of vertically going up the temperature rising reaches about 50m, and vertically development degree is progressively improving.Every burning index all shows as the characteristics of high-temperature oxydation burning; Along with the prolongation of combustion in situ time, temperature is progressively to plane and vertically expansion near the gas injection well, and swept volume increases gradually, shows that the perforated interval of design and gas injection well pattern configuration relation adapt to the baked wheaten cake of such oil reservoir.Average individual well daily output rises to 3.6t/d by 2.4t/d, the highest day produce oil 97.3t/d of well group, and the combustion in situ stage increases oil 1.9745 * 10
4T, stage recovery percent of reserves 1.58%, accumulative total air-oil ratio 1281m
3/ t, combustion in situ have seen tangible oil increasing effect and economic benefit.From present situation, the combustion in situ testing program is scientific and reasonable.
Six, embodiment 2
(1) according to oil field geologic feature and exploitation present situation, carries out coarse screening.This oil reservoir meets the following conditions: core intersection＞30m, and thickness in monolayer accounts for 70% of gross thickness greater than the core intersection of 10m, remaining oil saturation＞0.45, degree of porosity＞0.18, permeability＞200md, degassed crude viscosity＜10000mPa.s under the formation condition, reservoir depth＜2000m;
(2) at first be the oil reservoir that steam soak is crossed, carry out the remaining oil saturation distribution and describe.According to the distribution situation of this oil reservoir every interlayer, this piece is divided into upper and lower two cover series of strata exploitations on the whole, begin to adopt " move wind start to exchange fire formula " whole development on the plane from the high-order bit.
(3) determine air consumption according to thing mould result of study and remaining oil saturation.
(4) penetrate out thickness according to gas injection well and the live wire onlap is determined combustion thickness, calculate different live wires and involve gas injection speed under the situation.
(5) adopt dry forward combustion " moving wind starts to exchange fire " formula, divide two cover series of strata fireflood exploitations, well spacing 105m, array pitch 300m; Adopt the mode gas injection of speed change gas injection, initial stage individual well gas injection speed 5000～7000m
3/ d, conversion unit cross-sectional area air flux 1.93m
3/ (m
2.h), dynamic segmentation increases gas injection speed, and the moon increases 3000～4000m
3/ d, oil well lifting rate 15～25m
3/ d, the prediction fireflood was produced 8.5 years, can improve recovery ratio 20.4%, and ultimate recovery can reach 44%.
As above-mentioned, the clear device that the utility model proposes that described in detail.But, although the utility model is described and explained to preferred embodiment of the present utility model in detail, this area those skilled in the art also are appreciated that under the situation of the spirit and scope of the present utility model that do not deviate from the claims definition, can make multiple modification in form and details.
Claims (6)
1. one kind is passed through the device that the block viscous crude of gas injection speed exploitation thick-layer is burnt in control, this device is included in segmentation gas injection tubing string is set in the gas injection well, it is characterized in that, described segmentation gas injection tubing string is made up of sealing tubing string and the tubing string that has perforation, the sealing tubing string is arranged on the position of blocking of the block viscous crude oil reservoir of thick-layer intraformational bed, and the tubing string that has perforation is arranged in the viscous crude oil reservoir.
2. device according to claim 1 is characterized in that, is provided with one-way cock and controller in the perforation of the tubing string that has perforation.
3. device according to claim 2 is characterized in that, segmentation gas injection tubing string connects the source of the gas on ground, is provided with to add compression pump between source of the gas and segmentation gas injection tubing string.
4. according to the arbitrary described device among the claim 1-3, it is characterized in that the controller that is provided with in the tubing string perforation is electrically connected with ground control unit, the instruction that receives ground control unit comes the opening degree of controlling non-return valve door.
5. according to the device described in the claim 4, it is characterized in that ground control unit includes central control room and gas injection pressure control system.
6. according to the device described in the claim 5, it is characterized in that the gas injection pressure control system comprises by pressure compensated pump (1), gasholder (2), adjustable speed gas injection pump (3), first valve (4), first pressure display unit (5), second valve (6), the first indication gas generator (7), the first indication gas volume gauge line (8), second pressure display unit (9), micropore capillary tube (10), metering device (11), the 3rd valve (12), the second indication gas generator (13), the second indication gas volume gauge line (14), the 4th valve (15), the first indication gas recurs device (16), the 3rd indication gas volume gauge line (17), the second indication gas recurs device (18), the 4th indication gas volume gauge line (19) is formed; The port of giving vent to anger of pressure compensated pump (1) connects the first air inlet port of gasholder (2), the port of giving vent to anger of adjustable speed gas injection pump (3) connects the second air inlet port of gasholder (2), the port of giving vent to anger of gasholder (2) connects the air inlet port of first valve (4), the port of giving vent to anger of first valve (4) connects the air inlet port of first pressure display unit (5), the port of giving vent to anger of first pressure display unit (5), one end of second valve (6), one end of one end of the 3rd valve (12) and the 4th valve (15) interconnects, the another port of second valve (6) connects the air inlet port of the first indication gas generator (7), the port of giving vent to anger of the first indication gas generator (7) connects the air inlet port of the first indication gas volume gauge line (8), the port of giving vent to anger of the first indication gas volume gauge line (8) connects the air inlet port of second pressure display unit (9), the port of giving vent to anger of second pressure display unit (9) connects an end of micropore capillary tube (10), the other end of micropore capillary tube (10) connects the arrival end of metering device (11), the another port of the 3rd valve (12) connects the air inlet port of the second indication gas generator (13), the port of giving vent to anger of the second indication gas generator (13) connects the air inlet port of the second indication gas volume gauge line (14), the another port of the 4th valve (15) connects the air inlet port that the first indication gas recurs device (16), first port of giving vent to anger of indicating gas to recur device (16) connects the air inlet port of the 3rd indication gas volume gauge line (17), the port of giving vent to anger of the 3rd indication gas volume gauge line (17) connects the air inlet port that the second indication gas recurs device (18), and second port of giving vent to anger of indicating gas to recur device (18) connects the air inlet port of the 4th indication gas volume gauge line (19).
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103775061A (en) * | 2012-10-23 | 2014-05-07 | 中国石油天然气集团公司 | Method for identifying inner interlayer by utilizing well temperature monitoring data |
| CN104405357A (en) * | 2014-10-31 | 2015-03-11 | 中国石油天然气股份有限公司 | Oil-layer fire-flooding mining method |
| CN110344798A (en) * | 2019-06-20 | 2019-10-18 | 中国石油天然气股份有限公司 | A kind of gravity fireflood method improving gravity fireflood regulation using horizontal row gas well |
-
2010
- 2010-04-26 CN CN201020169117XU patent/CN201714363U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103775061A (en) * | 2012-10-23 | 2014-05-07 | 中国石油天然气集团公司 | Method for identifying inner interlayer by utilizing well temperature monitoring data |
| CN103775061B (en) * | 2012-10-23 | 2016-06-08 | 中国石油天然气集团公司 | A kind of method utilizing well temperature monitoring materials identification thick oil pay intraformational bed |
| CN104405357A (en) * | 2014-10-31 | 2015-03-11 | 中国石油天然气股份有限公司 | Oil-layer fire-flooding mining method |
| CN110344798A (en) * | 2019-06-20 | 2019-10-18 | 中国石油天然气股份有限公司 | A kind of gravity fireflood method improving gravity fireflood regulation using horizontal row gas well |
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