CN204252984U - Electricity vapour integration steam injection system - Google Patents
Electricity vapour integration steam injection system Download PDFInfo
- Publication number
- CN204252984U CN204252984U CN201420634640.3U CN201420634640U CN204252984U CN 204252984 U CN204252984 U CN 204252984U CN 201420634640 U CN201420634640 U CN 201420634640U CN 204252984 U CN204252984 U CN 204252984U
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- Prior art keywords
- steam
- steam injection
- wet saturated
- saturated steam
- injection system
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- 238000010793 Steam injection (oil industry) Methods 0.000 title claims abstract description 44
- 230000010354 integration Effects 0.000 title claims abstract description 22
- 230000005611 electricity Effects 0.000 title description 4
- 229920006395 saturated elastomer Polymers 0.000 claims abstract description 51
- 239000003129 oil well Substances 0.000 claims abstract description 21
- 238000010438 heat treatment Methods 0.000 claims abstract description 20
- 238000005485 electric heating Methods 0.000 claims abstract description 17
- 238000004146 energy storage Methods 0.000 claims description 9
- 238000002347 injection Methods 0.000 claims description 8
- 239000007924 injection Substances 0.000 claims description 8
- 239000012530 fluid Substances 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 9
- 238000011084 recovery Methods 0.000 abstract description 8
- 230000000694 effects Effects 0.000 description 12
- 238000000605 extraction Methods 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000010795 Steam Flooding Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000010796 Steam-assisted gravity drainage Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000006392 deoxygenation reaction Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
Abstract
The utility model provides a kind of electric vapour integration steam injection system, and this electric vapour integration steam injection system comprises: steam injection equipment, for injecting wet saturated steam to oil well; And, the electric heating equipment of Alternating Current Power Supply, it comprises: down-hole oil tube; Be positioned at the hollow rod of described down-hole oil tube; And, the heating cable of described oil well bottom is goed deep into through described hollow rod; The lower end of described heating cable is connected with described down-hole oil tube bottom.Steam injection and electrical heating combine by the utility model, electrical heating is carried out to the wet saturated steam that steam injection equipment exports, because wet saturated steam passes through in oil pipe inside, therefore the heat produced, taken away by wet saturated steam stream, thus improve wet saturated steam enthalpy, improve the heat energy injecting the wet saturated steam in oil well and carry, the more conventional steam injection technology of the mass dryness fraction of the wet saturated steam in arrival shaft bottom is increased, thus is conducive to improving steam sweep area, thus improve thick oil recovery ratio.
Description
Technical field
The utility model relates to heavy crude heat extraction note technology, especially relates to a kind of electric vapour integration steam injection system.
Background technology
Steam flooding, steam soak and SAGD (SAGD) are the main process of current thickened oil recovery.Field use the most widely steam injection equipment is wet steamer generator, water is converted into the wet saturated steam that mass dryness fraction is 75, under Injection Well, heats oil reservoir, reduce viscosity of crude, thus improve recovery ratio.But heat extraction by steam injection technology exists following not enough: i.e. ground and wellbore heat loss, and heat waste is up to 20%-30% according to statistics, steam arrives shaft bottom mass dryness fraction less than 50%.Have a strong impact on steam sweep area, and the oil extraction of saturation water formation is unhelpful, and increases oil extraction cost.
Injection-production well electrical heating is one and utilizes ground electric energy to carry out electrically heated raising oil recovery factor technology at injection-production well.Oil well electrical heating theory and technology comes from the 1950's, starts the eighties in 20th century to have carried out a large amount of pilot tests, and achieves the initial success of the centralized resistance heated of oil well, and after electrical heating excitation, crude output improves 2-4 doubly left and right.But simple electrical heating, by state's inner cable manufacture craft and oil well size restrictions, cannot reach designing requirement.
Therefore, the thick oil recovery ratio of existing heavy crude heat extraction note technology is not high.
Utility model content
The purpose of this utility model is to provide a kind of electric vapour integration steam injection system, to improve thick oil recovery ratio.
For achieving the above object, the utility model provides a kind of electric vapour integration steam injection system, comprising:
Steam injection equipment, for injecting wet saturated steam to oil well; And,
The electric heating equipment of Alternating Current Power Supply, it comprises:
Be positioned at the hollow rod of down-hole oil tube; And,
The heating cable of described oil well bottom is goed deep into through described hollow rod;
The lower end of described heating cable is connected with described down-hole oil tube bottom.
Electric vapour integration steam injection system of the present utility model, this system also comprises wind power equipment, and it comprises:
Wind-driven generator, for being transformed into three-phase main-frequency alternating current by wind energy;
Energy storage device, stores for described three-phase main-frequency alternating current being transformed into direct current;
Inverter, it is that described electric heating equipment is powered that the direct current for being stored by described energy storage device is transformed into single-phase mid-frequency alternating current.
Electric vapour integration steam injection system of the present utility model, the lower end of described heating cable is connected by the inwall of return contacts with described down-hole oil tube bottom.
Electric vapour integration steam injection system of the present utility model, described electric heating equipment also comprises:
Sensor group, for detecting the pressure of wet saturated steam in down-hole oil tube, temperature, mass dryness fraction and flow;
Power control unit, it is serially connected with between described energy storage device and described inverter;
PLC, for the duty of power control unit according to described pressure, temperature, mass dryness fraction and flow-control.
Electric vapour integration steam injection system of the present utility model, described steam injection equipment comprises the waterworks, injection boiler and the steam transmitting pipe line that are connected successively, and described steam transmitting pipe line is connected with the wellhead sealing of described oil well.
Electric vapour integration steam injection system of the present utility model, the outer cover of described down-hole oil tube has sleeve pipe, is formed with gap between described down-hole oil tube and described sleeve pipe, is provided with the packer for block fluid in described gap.
Steam injection and electrical heating combine by the utility model, electrical heating is carried out to the wet saturated steam that steam injection equipment exports, because wet saturated steam passes through in oil pipe inside, therefore the heat produced, taken away by wet saturated steam stream, thus improve wet saturated steam enthalpy, improve the heat energy injecting the wet saturated steam in oil well and carry, the more conventional steam injection technology of the mass dryness fraction of the wet saturated steam in arrival shaft bottom is increased, thus is conducive to improving steam sweep area, thus improve thick oil recovery ratio.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide further understanding of the present utility model, forms a application's part, does not form restriction of the present utility model.In the accompanying drawings:
Fig. 1 is the structural representation of the electric vapour integration steam injection system of the utility model embodiment.
Detailed description of the invention
For making the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with embodiment and accompanying drawing, the utility model is described in further details.At this, schematic description and description of the present utility model for explaining the utility model, but not as to restriction of the present utility model.
Below in conjunction with accompanying drawing, detailed description of the invention of the present utility model is described in further detail.
Shown in figure 1, the electric vapour integration steam injection system of the utility model embodiment mainly comprises the electric heating equipment of steam injection equipment and Alternating Current Power Supply.Wherein:
Steam injection equipment, for injecting wet saturated steam to oil well, it comprises the waterworks 4, injection boiler 5 and the steam transmitting pipe line 6 that are connected successively, and steam transmitting pipe line 6 is tightly connected with the well head 7 of oil well.
Electric heating equipment, heat for the wet saturated steam injected in oil well steam injection equipment, it comprises:
Down-hole oil tube 2, is positioned at the hollow rod 14 of down-hole oil tube 2, and gos deep into the heating cable 15 of oil well bottom through hollow rod 14, is connected by the inwall of return contacts 16 with down-hole oil tube 2 bottom with the lower end of heating cable 15.After powered up, it is contrary that down-hole oil tube 2 and hollow rod 14 form direction substantially, equal-sized electric current, thus produce kelvin effect, approach effect and screen effect, increase considerably AC impedance, under the acting in conjunction of kelvin effect, approach effect and screen effect, produce heat, realize electric heating conversion, because wet saturated steam passes through in down-hole oil tube 2 inside, therefore the heat produced, taken away by wet saturated steam stream, thus improve wet saturated steam enthalpy, be conducive to the steam flooding to oil reservoir 3.
In order to energy-conserving and environment-protective, the electric vapour integration steam injection system of the utility model embodiment also comprises the wind power equipment for providing power supply for electric heating equipment, and this wind power equipment comprises:
Wind-driven generator 9, for being transformed into three-phase main-frequency (50Hz, AC380V) alternating current by wind energy;
Energy storage device 10, stores for three-phase main-frequency alternating current being transformed into direct current (such as DC530V) electricity;
Inverter 12, it is that electric heating equipment is powered that the direct current for being stored by energy storage device 10 is transformed into such as 10-1000Hz single-phase mid-frequency alternating current.
In addition, in the utility model embodiment, the outer cover of down-hole oil tube 2 has sleeve pipe 1, is formed with gap between down-hole oil tube 2 and sleeve pipe 1, be provided with the packer 8 for block fluid in gap, when steam injection, this packer 8 can be used for preventing wet saturated steam from going here and there to last time and causing thermal loss to be accelerated.
In order to realize more accurate wet saturated steam computer heating control and not waste electric energy, the electric heating equipment of the utility model embodiment can also comprise:
Sensor group 17, for detecting the pressure of wet saturated steam in down-hole oil tube 2, temperature, mass dryness fraction and flow;
Power control unit 11 (such as digital regulation resistance etc.), it is serially connected with between energy storage device 10 and inverter 12;
PLC 13, for the duty according to pressure, temperature, mass dryness fraction and flow-control power control unit 11, thus controls the power output of the whole electric heating equipment of adjustment, makes the mass dryness fraction of downhole wet saturated vapour can reach setting requirement all the time.Concrete, the energy balane of usual wet saturated steam and its pressure, temperature, mass dryness fraction, flow are relevant, by the saturated vapour under known known pressure (temperature) of tabling look-up and saturation water enthalpy, can utilize following formulae discovery:
Q=xh1+ (1-x) h2, wherein, Q is the energy that wet saturated steam has, and X is wet saturated steam mass dryness fraction, and h1 is saturated vapour enthalpy, and h2 is saturation water enthalpy.Such as:
Pressure: 17.5Mpa, temperature 353 DEG C, 1k mass dryness fraction is the energy that has of wet saturated steam of 75% :=1*0.75*607.4+1*0.25*405.1=556.8Kcal;
Pressure: 17.5Mpa, temperature 353 DEG C, 1kg mass dryness fraction is the energy that has of wet saturated steam of 95% :=1*0.95*607.4+1*0.05*405.1=597.3Kcal.
Therefore, if the mass dryness fraction of every kilogram of wet saturated steam 75% brings up to 95%, need energy=597.3-556.8=40.5kcal, this part energy is provided by wind-power electricity generation.The energy that PLC 13 produces according to the current electric heating equipment of pressure, temperature, mass dryness fraction and flow rate calculation, to carry out energy dynamics compensation to the wet saturated steam in oil well, thus makes the mass dryness fraction of downhole wet saturated vapour can reach setting requirement all the time.
The steam injection method of the electric vapour integration steam injection system of above-mentioned the utility model embodiment comprises the following steps:
Step 1, injects oil well by the wet saturated steam that steam injection equipment exports by well head.Wherein, wet saturated steam is generated by following process:
Injection boiler carries out except after hard, deoxygenation, injection boiler and its fuel combustion heat exchange is entered after waterworks raising carrys out water pressure (17.5Mpa), the outlet steam quality of the wet saturated steam that injection boiler exports is 75%, pressure is 17.5Mpa, temperature is about 353 DEG C, after be transported to well head through steam transmitting pipe line, heat energy loss is about 3%-5%, mass dryness fraction is reduced to about 70%, arrive well head wet saturated steam by under kit mate-assist Injection Well in order to heat oil reservoir.
Step 2, opens electric heating equipment and heats the wet saturated steam injected in oil well.After powered up, it is contrary that down-hole oil tube 2 and hollow rod 14 form direction substantially, equal-sized electric current, thus produce kelvin effect, approach effect and screen effect, increase considerably AC impedance, under the acting in conjunction of kelvin effect, approach effect and screen effect, produce heat, realize electric heating conversion, because wet saturated steam passes through in down-hole oil tube 2 inside, therefore the heat produced, taken away by wet saturated steam stream, thus improve wet saturated steam enthalpy, be conducive to the steam flooding to oil reservoir 3.
The utility model embodiment achieves and steam injection and electrical heating is combined thus, individual event medium frequency electric is adopted to heat the wet saturated steam that steam injection equipment exports, because wet saturated steam passes through in oil pipe inside, therefore the heat produced, taken away by wet saturated steam stream, thus improve wet saturated steam enthalpy, improve the heat energy injecting the wet saturated steam in oil well and carry, to offset wellbore heat loss, the more conventional steam injection technology of the mass dryness fraction of the wet saturated steam in arrival shaft bottom is increased, thus be conducive to improving steam sweep area, thus improve thick oil recovery ratio.
Above-described specific embodiment; the purpose of this utility model, technical scheme and beneficial effect are further described; be understood that; the foregoing is only specific embodiment of the utility model; and be not used in restriction protection domain of the present utility model; all within spirit of the present utility model and principle, any amendment made, equivalent replacement, improvement etc., all should be included within protection domain of the present utility model.
Claims (6)
1. an electric vapour integration steam injection system, is characterized in that, comprising:
Steam injection equipment, for injecting wet saturated steam to oil well; And,
The electric heating equipment of Alternating Current Power Supply, it comprises:
Down-hole oil tube;
Be positioned at the hollow rod of described down-hole oil tube; And,
The heating cable of described oil well bottom is goed deep into through described hollow rod;
The lower end of described heating cable is connected with described down-hole oil tube bottom.
2. electric vapour integration steam injection system according to claim 1, it is characterized in that, this system also comprises wind power equipment, and it comprises:
Wind-driven generator, for being transformed into three-phase main-frequency alternating current by wind energy;
Energy storage device, stores for described three-phase main-frequency alternating current being transformed into direct current;
Inverter, it is that described electric heating equipment is powered that the direct current for being stored by described energy storage device is transformed into single-phase mid-frequency alternating current.
3. electric vapour integration steam injection system according to claim 1 and 2, it is characterized in that, the lower end of described heating cable is connected by the inwall of return contacts with described down-hole oil tube bottom.
4. electric vapour integration steam injection system according to claim 2, it is characterized in that, described electric heating equipment also comprises:
Sensor group, for detecting the pressure of wet saturated steam in down-hole oil tube, temperature, mass dryness fraction and flow;
Power control unit, it is serially connected with between described energy storage device and described inverter;
PLC, for the duty of power control unit according to described pressure, temperature, mass dryness fraction and flow-control.
5. electric vapour integration steam injection system according to claim 1 and 2, it is characterized in that, described steam injection equipment comprises the waterworks, injection boiler and the steam transmitting pipe line that are connected successively, and described steam transmitting pipe line is connected with the wellhead sealing of described oil well.
6. electric vapour integration steam injection system according to claim 5, it is characterized in that, the outer cover of described down-hole oil tube has sleeve pipe, is formed with gap between described down-hole oil tube and described sleeve pipe, is provided with the packer for block fluid in described gap.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420634640.3U CN204252984U (en) | 2014-10-29 | 2014-10-29 | Electricity vapour integration steam injection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420634640.3U CN204252984U (en) | 2014-10-29 | 2014-10-29 | Electricity vapour integration steam injection system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204252984U true CN204252984U (en) | 2015-04-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420634640.3U Expired - Fee Related CN204252984U (en) | 2014-10-29 | 2014-10-29 | Electricity vapour integration steam injection system |
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| Country | Link |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104373096A (en) * | 2014-10-29 | 2015-02-25 | 中国石油天然气股份有限公司 | Electric and steam integrated steam injection system and steam injecting method thereof |
| CN104790929A (en) * | 2015-04-20 | 2015-07-22 | 辽宁华孚石油高科技股份有限公司 | Electric preheating device for deep oil sand oil reservoir |
| CN115596417A (en) * | 2021-07-08 | 2023-01-13 | 中国石油天然气股份有限公司（Cn） | Layered steam injection heating system |
-
2014
- 2014-10-29 CN CN201420634640.3U patent/CN204252984U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104373096A (en) * | 2014-10-29 | 2015-02-25 | 中国石油天然气股份有限公司 | Electric and steam integrated steam injection system and steam injecting method thereof |
| CN104790929A (en) * | 2015-04-20 | 2015-07-22 | 辽宁华孚石油高科技股份有限公司 | Electric preheating device for deep oil sand oil reservoir |
| CN115596417A (en) * | 2021-07-08 | 2023-01-13 | 中国石油天然气股份有限公司（Cn） | Layered steam injection heating system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150408 |