CN207686693U - A kind of flow string and device for producing thickened oil - Google Patents

A kind of flow string and device for producing thickened oil Download PDF

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Publication number
CN207686693U
CN207686693U CN201721679425.5U CN201721679425U CN207686693U CN 207686693 U CN207686693 U CN 207686693U CN 201721679425 U CN201721679425 U CN 201721679425U CN 207686693 U CN207686693 U CN 207686693U
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oil
oil pipe
pipe
heating tube
center
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杨文明
孙红海
顾俊颖
王强
周小平
王培俊
廖伟伟
周博
杨美纯
姚杰
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China Petroleum and Natural Gas Co Ltd
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China Petroleum and Natural Gas Co Ltd
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Abstract

A kind of flow string of the utility model offer and device for producing thickened oil.Wherein flow string, including:Center oil pipe for being plugged in casing and the heating tube being set on the outside of the oil pipe upper end of center;Waterflood path is formed between the inner surface and center oil pipe of heating tube;The outer surface of heating tube is connected to for forming return flow line between casing between waterflood path and return flow line.Flow string provided by the utility model can be suitable for water filling mode of heating drop and stick heavy crude producing.The utility model additionally provides a kind of device for producing thickened oil including above-mentioned flow string.

Description

A kind of flow string and device for producing thickened oil
Technical field
The utility model is related to a kind of flow string and device for producing thickened oil more particularly to a kind of thickened oil recovery production pipes Column and device for producing thickened oil belong to oil extraction in oil field engineering field.
Background technology
Viscous crude is one kind of crude oil, and since light fraction content is relatively low in viscous crude, and colloid and bitumen content are higher, therefore The density and viscosity of viscous crude are all larger.Relative density is usually more than 0.92 (20 DEG C), underground viscosity is more than the original of 50mPas Oil is known as viscous crude.
The viscosity of viscous crude is very sensitive for temperature, and as the temperature increases, the viscosity of viscous crude drastically declines, and viscous crude is glutinous Degree is higher, and this variation is more apparent.During thickened oil recovery, general heavy oil wells are deeper, and reservoir temperature is higher, then viscous crude Viscosity is lower.The study found that when the depth of heavy oil wells reaches 4000 meters or so, depth often continues growing 100 meters, viscous crude Temperature can increase 2.4 DEG C~3 DEG C, and the viscosity of viscous crude significantly reduces therewith.But it is leaned on when viscous crude is given rise to from viscous crude bottom When place near the ground, since the temperature of Near Ground is less than the temperature of viscous crude bottom, so the viscosity of viscous crude increases, it is unfavorable for thick Oil exploitation.
For this purpose, in the practical recovery process of viscous crude, mostly using mode of heating reduces its viscosity, such as steam drive, fire Oil firing layer etc. also can mix thin oil, emulsifier etc. in viscous crude and mix thin liquid, to reduce Viscosity of Heavy Crude Oil, reduce exploitation difficulty.Accordingly , the structure of used flow string also needs to match with the glutinous mode of above-mentioned drop, such as can be by being noted into flow string Enter air and high-temperature steam to reduce Viscosity of Heavy Crude Oil, realizes that viscous crude is smoothly exploited.To avoid when injecting air and high-temperature steam It causes danger, need to also bottom valve be set in center oil pipe end, with can be in default opening and closing of fault under opening pressure.
But lacking at present a kind of can realize that hot-water flooding drop is glutinous and filled with the flow string of heavy crude producing and thickened oil recovery It sets.
Utility model content
In view of the above-mentioned drawbacks in the prior art, the utility model provides a kind of flow string, by center oil pipe with It is provided with heating tube in oil jacket annular space between casing, enables hot water to the water filling by being formed between center oil pipe and heating tube Channel, which is injected and carries out heating drop to the viscous crude in the oil pipe of center, to be sticked, and to meet the requirement of hot-water flooding heavy crude producing, is realized The smooth exploitation of viscous crude.
The first aspect of the utility model is to provide a kind of flow string, including:Center for being plugged in casing Oil pipe and the heating tube being set on the outside of the oil pipe upper end of center;Water filling is formed between the inner surface and center oil pipe of heating tube Channel;The outer surface of heating tube is connected to for forming return flow line between casing between waterflood path and return flow line.
Further, waterflood path is connected to return flow line in the lower section of heating tube.
Further, above-mentioned flow string further includes the packer being arranged below heating tube, the packer for will in It is formed by oil jacket annular space between heart oil pipe and casing and is separated into annular space and lower annular space;The hot water of waterflood path is injected in upper ring Flowing in empty.
Further, heating tube is coaxially disposed with center oil pipe.
Further, the inner diameter values of heating tube are the root mean square of center pipe aperture value and casing inner diameter value.
Further, above-mentioned flow string further includes the heating device being arranged above heating tube, which is used for Hot water in waterflood path to be implanted is heated.
Further, above-mentioned flow string further includes circulating pump, circulating pump setting heating device and waterflood path it Between, alternatively, the circulating pump is arranged between return flow line and heating device.
Further, center oil pipe includes more pipe nipples, is threadedly coupled between adjacent pipe nipple, forms above-mentioned center oil Pipe.
Further, above-mentioned flow string further includes oil well pump, and oil well pump is connect with center oil pipe, in the oil pipe of center Viscous crude flowing provide power.
The second aspect of the utility model is to provide a kind of device for producing thickened oil, including production tree and above-mentioned production pipe Column;Production tree includes production tree ontology, and the tubing hanger and casing hanger being connect respectively with production tree ontology;Tubing hanger and center Oil pipe connects, and casing hanger is connect with heating tube, and casing hanger is used for and casing connection.
The utility model provides a kind of flow string, by being arranged in the oil jacket annular space between center oil pipe and casing Heating tube to form waterflood path between center oil pipe and heating tube, and forms between heating tube and casing Return flow line can be such that hot water is injected from waterflood path and be heated to the viscous crude in the oil pipe of center, make Viscosity of Heavy Crude Oil in this way It reduces, to realize the smooth exploitation of viscous crude, and improves thickened oil recovery amount and oil well producing level;The hot water then from return Discharge in circulation road, avoids the problem of viscous crude moisture content increases caused by moisture enters in viscous crude, follow-up thick to be conducive to The further processing processing of oil.
Meanwhile flow string provided by the utility model, it is glutinous since water filling mode of heating drop can be suitable for, realize viscous crude Smooth exploitation can reduce production cost compared to current steam drive or the thickened oil recoveries mode such as mix thin liquid.
Also, flow string provided by the utility model, it is simple in structure, it is convenient for large-scale promotion and utilization.
The utility model additionally provides a kind of device for producing thickened oil, including above-mentioned flow string.The device for producing thickened oil energy Enough meet the needs of water filling drop is sticked with heavy crude producing, and can realize the smooth exploitation of viscous crude, and improves the utilization rate of oil wells.
Also, device for producing thickened oil provided by the utility model, it is simple in structure, it is convenient for large-scale promotion and application.
Description of the drawings
The drawings herein are incorporated into the specification and forms part of this specification, and shows the implementation for meeting the disclosure Example, and together with specification for explaining the principles of this disclosure.
Fig. 1 is the structural schematic diagram for the flow string that one embodiment of the utility model provides;
Fig. 2 is the vertical view for the flow string that one embodiment of the utility model provides;
Fig. 3 is the structural schematic diagram for the flow string that another embodiment of the utility model provides.
Reference sign
The centers 1- oil pipe;11- pipe nipples;
12- reducer unions;2- heating tubes;
3- waterflood paths;The return flow lines 4-;
5- packers;The upper annular spaces of 6-;
Annular space under 7-;100- casings;
200- cementing concretes;300- pit shafts;
400- perforations.
Through the above attached drawings, it has been shown that the specific embodiment of the disclosure will be hereinafter described in more detail.Above-mentioned attached drawing It is not intended to limit the scope of this disclosure concept by any means with verbal description, but is by referring to specific embodiments Those skilled in the art illustrate the concept of the disclosure.
Specific implementation mode
It is new below in conjunction with this practicality to keep the purpose, technical scheme and advantage of the utility model embodiment clearer Attached drawing in type embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that is retouched The embodiment stated is the utility model a part of the embodiment, instead of all the embodiments.In the absence of conflict, Xia Shushi The feature applied in example can be combined with each other.
Such as had a talk about without spy bright, the "upper" in following embodiment refers to the direction from thick oil reservoir towards ground;Following reality The "lower" in example is applied, refers to the direction from ground facing towards thick oil reservoir.
Embodiment one
In oil extraction, if reasons such as the insufficient pressure or Crude viscosity of wellbore bottom are excessive, make oil well from Body energy the crude oil in pit shaft cannot be given rise to ground or give rise to ground crude oil amount it is too low, it is necessary to use with machinery Mode based on oil recovery carries out artificial lift.Flow string is the core component of device for producing thickened oil, and role is Ground is given rise to by the crude oil in the energy transmission to pit shaft on ground, and by crude oil.
Fig. 1 is the structural schematic diagram for the flow string that one embodiment of the utility model provides, and wherein arrow direction represents liquid Body flow direction;Fig. 2 is the vertical view for the flow string that one embodiment of the utility model provides.As depicted in figs. 1 and 2, this reality It applies example and a kind of flow string is provided, including:Center oil pipe 1 for being plugged in casing 100 and it is set in center oil pipe 1 Heating tube 2 on the outside of upper end;
Waterflood path 3 is formed between the inner surface and center oil pipe 1 of heating tube 2;The outer surface of heating tube 2 is used for and casing Return flow line 4 is formed between 100, is connected between waterflood path 3 and return flow line 4.
Specifically, the casing 100 used during thickened oil recovery, is the steel pipe for being used to support the heavy oil wells borehole wall, to ensure Drilling process carries out the normal operation with entire heavy oil wells after completion.Casing 100 is fixed on thick generally by cementing concrete 200 In the pit shaft 300 of oil well, and multi-openings 400 are radially offered on the side wall of 100 bottom of casing, make the viscous crude in reservoir Can be by 400 sleeve pipe 100 of perforation, and enter in center oil pipe 1 under reservoir pressure and flowed towards ground direction It is dynamic.
Before thickened oil recovery, can heavy oil wells be drilled into certain depth, such as 4000 meters first, then in the well of heavy oil wells Setting of casing 100 in cylinder 300, forms annular space, the radial dimension of the annular space is general between casing 100 and pit shaft 300 For 30mm~80mm;Then cementing concrete 200, that is, " well cementation " being commonly called as are injected into the annular space;Then use perforation work Tool is shot through 100 bottom of casing, cementing concrete 200 and gos deep into thick oil reservoir successively, forms the company between casing 100 and thick oil reservoir Through-hole road, i.e. perforation 400;Secondly implement kill-job, prevent that blowout occurs when subsequent job, ensure thickened oil recovery safety, smoothly into Row;Heating tube 2 and center oil pipe 1 are finally descended, well killing fluid is enumerated using center oil pipe 1, it is ensured that oil reservoir when follow-up thickened oil recovery It is unimpeded.
During practical thickened oil recovery, the convolution perfusion of the re-injection high-temperature-hot-water first into waterflood path 3, i.e. flow, heat While water flows downward under gravity, occurred by the tube wall of center oil pipe 1 with the viscous crude in center oil pipe 1 Heat transfer makes viscous crude temperature rise due to heat absorption, viscosity significantly reduce, it is thus possible to the successfully discharge out of center oil pipe 1.Cause This, the flow string that the present embodiment is provided meets the glutinous requirement with heavy crude producing of hot-water flooding drop, and realizes the suitable of viscous crude Profit exploitation.
Meanwhile compared to the current thickened oil recovery mode using injection high-temperature steam, the production pipe that the present embodiment is provided Column due to being not necessarily to heat the water to gaseous state, thus has saved energy consumption and production cost, and has improved thickened oil recovery operation process In safety.And compared to the thickened oil recovery mode for mixing thin liquid at present, the flow string that the present embodiment is provided is not necessarily to Further separating treatment subsequently is carried out to the thin liquid of mixing in viscous crude, to reduce follow-up viscous crude processing cost.
Also, the hot water after cooling down because of heat exchange is discharged through return flow line 4, which can further recycle; Simultaneously can also avoid the problem that occur because hot water sleeve pipe 100 deeper inside due to increase viscous crude moisture content, further reduced Production cost.
In addition, the flow string that the present embodiment is provided, structure is relatively simple, promotes and uses convenient for large-scale.
Specifically, through-hole can be offered on the tube wall of heating tube 2, realize between waterflood path 3 and return flow line 4 Connection.
Alternatively, please further refer to Fig. 1, waterflood path 3 can also be connected to return flow line 4 in the lower section of heating tube 2, than Such as can packer 5 be set in the lower section of heating tube 2, the packer 5 between center oil pipe 1 and casing 100 for will be formed by Oil jacket annular space is separated into annular space 6 and lower annular space 7;Inject hot water flowing in upper annular space 6 of waterflood path 3.That is, above-mentioned note It is connected to by upper annular space 6 with realizing between aquaporin 3 and return flow line 4.
Above structure be arranged, can not only avoid injection hot water along 100 bottom of oil jacket annular space sleeve pipe and caused by The problem of viscous crude moisture content rises, but also the larger problem of hot water usage amount is prevented, it is produced into advantageously reduce This.
Packer 5 is by elastic sealing elements to insulate the underground of the oil jacket annular space between casing 100 and center oil pipe 1 Tool is the indispensable tool of oil extraction in oil field.Beating for heavy oil production channel is realized in setting and unsealing by the packer 5 It is open and close.
The present embodiment is not specially limited used packer 5, can be self-sealing, expanding compression and group It is box-like etc..Such as can be common packer 5 in current oil extraction, such as model Y111, Y211, Y221, Y341, The packer product obtained after the packer 5 or above-mentioned packer 5 of K331, K344 etc. are further improved.
The present embodiment is not specially limited the shape and size of above-mentioned heating tube 2, as long as center can be set in Outside oil pipe 1, the waterflood path 3 of sufficient space is formed with center oil pipe 1, and the reflux of sufficient space is formed between casing 100 Channel 4, such as its cross section can be round or ellipses, can also be the polygons such as triangle, quadrangle.Such as Fig. 2 Shown, as a preferred solution, the cross section of heating tube 2 is circle.
Please further refer to Fig. 1 and Fig. 2, as a preferred solution, can be between heating tube 2 and center oil pipe 1 Coaxial arrangement, the then cross section of the waterflood path 3 formed are the annulus of regular shape, keep the hot water in waterflood path 3 right Viscous crude in center oil pipe 1 is evenly heated, and the smooth exploitation of viscous crude is conducive to.
It, then can be further coaxial with casing 100 by heating tube 2 and center oil pipe 1 since casing 100 is generally pylindrical Setting, and the space (volume) that controls waterflood path 3 is roughly the same with the space of return flow line 4 or the sky of waterflood path 3 Between be slightly less than the space of return flow line 4, so that the hot water injected into waterflood path 3 is smoothly discharged through return flow line 4, realize The good circulation of hot water and sufficient heat exchange with viscous crude, ensure being smoothed out for thickened oil recovery.
Optionally, the inner diameter values of heating tube 2 are the average value of 100 inner diameter values of 1 inner diameter values of center oil pipe and casing, such as false If the internal diameter of center oil pipe 1 be a, heating tube 2 internal diameter be b, casing 100 internal diameter be c, then b=(a+c)/2.In this way can The space of waterflood path 3 is set to be slightly less than the space of return flow line 4, then the hot water in waterflood path 3 is after heat exchange, Neng Goujing Return flow line 4 is smoothly discharged, while guaranteeing the viscous crude temperature in promotion center oil pipe 1, and reaching, which reduces Viscosity of Heavy Crude Oil, realizes The purpose normally produced.
Optionally, the inner diameter values of heating tube 2 are the root mean square of 100 inner diameter values of 1 inner diameter values of center oil pipe and casing, such as false If the internal diameter of center oil pipe 1 be a, heating tube 2 internal diameter be b, casing 100 internal diameter be c, thenIn this way can Keep waterflood path 3 and the space of return flow line 4 essentially identical, the hot water in waterflood path 3, can be through reflux after heat exchange Channel 4 is smoothly discharged, while guaranteeing the viscous crude temperature in promotion center oil pipe 1, and reaching, which reduces Viscosity of Heavy Crude Oil, realizes normally The purpose of production.
The temperature of the above-mentioned hot water for being heated to the viscous crude in center oil pipe 1, can according to the viscosity of practical viscous crude, The factors such as the circulation rate of speed, hot water that viscous crude flows up in center oil pipe 1 are flexibly rationally arranged, make through superheated water with After heat exchange between viscous crude, the temperature of viscous crude can reach critical point temperature.The critical point temperature refers to critical at this Viscosity of Heavy Crude Oil at a temperature of point can ensure that viscous crude successfully can be given rise to ground from center oil pipe 1, realize normal production.
For example the critical point temperature of viscous crude is 40 DEG C or so, then the temperature of hot water is in general control injection waterflood path 3 50 DEG C~90 DEG C;After heat exchange, the hot water temperature being discharged from return flow line 4 is generally 40 DEG C or so.Certainly, if viscous crude Critical point temperature is 10 DEG C or so, can suitably reduce the temperature of hot water.
Further, above-mentioned flow string can also include the heating device (not shown) being arranged above heating tube 2, should Heating device injects water filling for being heated to the hot water in waterflood path 3 to be implanted after so that hot water is reached suitable temperature In channel 3.
It further, should to realize that recycling for hot water, above-mentioned flow string can also include circulating pump (not shown) Circulating pump can be connect with heating device, for example can be connected between heating device and waterflood path 3, alternatively, the circulating pump It can also be arranged between return flow line 4 and heating device.
By the setting of the circulating pump, continue after capable of being heated to suitable temperature from the water being discharged in return flow line 4 It is injected into waterflood path 3, to realize recycling for hot water, avoids the waste of hot water, advantageously reduce production cost.
Also, the injection rate (i.e. circulation rate) that hot water can also be adjusted by circulating pump, makes the heat in return flow line 4 Water can fully heat the viscous crude in center oil pipe 1, improve thickened oil recovery yield.
Flow string provided in this embodiment can be adapted for flowing well relatively conventional in current thickened oil recovery, also may be used To be suitable for machine-pumped oil well.Wherein, for machine-pumped oil well, above-mentioned flow string can further include oil well pump (not shown), should Oil well pump is connect with center oil pipe 1, and power is provided with the flowing for the viscous crude in center oil pipe 1.
Specifically, above-mentioned oil well pump is generally arranged in center oil pipe 1, for example, can with the middle part of centrally disposed oil pipe 1, Can also the middle part of centrally disposed oil pipe 1 position on the lower side, the distance between 1 lower end of center oil pipe can be according to practical casing The conditions such as pressure of viscous crude are rationally arranged in 100, can viscous crude be given rise to ground.
Center oil pipe 1 is that former oil and gas etc. is transported from reservoir to the pipeline to ground after the completion of probing.This implementation Example is not specially limited the structure of center oil pipe 1 and material etc., can be the common center oil of institute in current thickened oil recovery Pipe 1.
Fig. 3 is the structural schematic diagram for the flow string that another embodiment of the utility model provides.As shown in figure 3, the center Oil pipe 1 may include more pipe nipples 11, is threadedly coupled between adjacent pipe nipple 11, so as to form center oil pipe 1.Also, also Can the quantity and length of pipe nipple 11 be rationally set according to the depth of the pit shaft 300 of practical heavy oil wells.
Specifically, above-mentioned pipe nipple 11 is usually the steel pipe with regular length, specific material and pipe thickness are with can Bear subject to the pressure generated during thickened oil recovery, for example, the general adoptable steel pipe trade mark be J55, K55, N80, L80 and P110 etc., pipe thickness is generally 6mm~18mm or so.
Specifically, screw thread can be equipped at 11 both ends of above-mentioned pipe nipple, adjacent pipe nipple 11 is enable to realize threaded connection;Or Person can also be equipped with the reducer union 12 mating with pipe nipple 11, realize the spiral shell between adjacent pipe nipple 11 please further refer to Fig. 3 Line connects.
Embodiment two
The present embodiment provides a kind of device for producing thickened oil, including production tree (not shown) and flow string;Wherein, it recovers the oil Tree includes production tree ontology, and the tubing hanger and casing hanger being connect respectively with production tree ontology;
Please further refer to Fig. 1 and Fig. 2, flow string includes:Center oil pipe 1 for being plugged in casing 100 and The heating tube 2 being set on the outside of 1 upper end of center oil pipe;
Waterflood path 3 is formed between the inner surface and center oil pipe 1 of heating tube 2;The outer surface of heating tube 2 is used for and casing Return flow line 4 is formed between 100, is connected between waterflood path 3 and return flow line 4.
Wherein, tubing hanger is connect with center oil pipe 1, and casing hanger is connect with heating tube 2, and casing hanger is used to connect with casing 100 It connects.
Specifically, production tree is the wellhead assembly that flowing well and machine-pumped oil well etc. are used for crude oil extraction, it is that control and adjusting are former The capital equipment of oil production, includes mainly casing hanger, tubing hanger, production tree ontology three parts, and wherein casing hanger and tubing hanger is equal It is connect with production tree ontology.
Before thickened oil recovery, can heavy oil wells be drilled into certain depth first, then trapped in the pit shaft of heavy oil wells 300 Pipe 100, and cementing concrete 200, that is, " well cementation " being commonly called as are injected into the annular space between casing 100 and pit shaft 300;Then It is shot through 100 bottom of casing, cementing concrete 200 successively using perforation tool and gos deep into thick oil reservoir, form casing 100 and stored up with viscous crude Connected pore channel between layer, i.e. perforation 400;Secondly implement kill-job, prevent that blowout occurs when subsequent job, ensure thickened oil recovery peace Entirely, it is smoothed out;It finally descends heating tube 2 and center oil pipe 1, wherein heating tube 2 to be connect with the casing hanger in production tree, realizes and add The fixation of 2 position of heat pipe;Center oil pipe 1 in production tree tubing hanger and connect, realize the fixation of center oil pipe 1 position, protect For card during thickened oil recovery, center oil pipe 1 and heating tube 2 are capable of the fixation of holding position.In addition, before thickened oil recovery, Also well killing fluid is enumerated using center oil pipe 1, it is ensured that oil reservoir is unimpeded when follow-up thickened oil recovery.
During practical thickened oil recovery, the re-injection hot water first into waterflood path 3, i.e. flow convolution perfusion, hot water exist While flowing downward under the action of gravity, heat is occurred by the tube wall of center oil pipe 1 with the viscous crude in center oil pipe 1 and is passed It leads, viscous crude temperature rise due to heat absorption, viscosity is made to significantly reduce, it is thus possible to the successfully discharge out of center oil pipe 1.Therefore, The device for producing thickened oil that the present embodiment is provided meets the glutinous requirement with heavy crude producing of hot-water flooding drop, and realizes viscous crude Smoothly exploitation, and improve the producing level of heavy crude well.
Meanwhile compared to the current thickened oil recovery mode using injection high-temperature steam, the viscous crude that the present embodiment is provided is opened Device for picking due to being not necessarily to heat the water to gaseous state, thus has saved energy consumption and production cost, and has improved thickened oil recovery operation Safety in the process.And compared to the thickened oil recovery mode for mixing thin liquid at present, the thickened oil recovery that the present embodiment is provided Device, without subsequently implementing further separating treatment to the viscous crude produced, to reduce follow-up viscous crude processing cost.
Also, the hot water after cooling down because of heat exchange is discharged through return flow line 4, avoids occurring because of hot water sleeve pipe 100 Deeper inside and the problem of increase viscous crude moisture content, while also avoiding a large amount of uses of hot water, further reduced production cost.
In addition, the device for producing thickened oil that the present embodiment is provided, structure and application method are all relatively simple, convenient for big rule The popularization and use of mould.
For the connection for realizing between waterflood path 3 and return flow line 4, specifically, can be opened up on the tube wall of heating tube 2 There is through-hole.
Alternatively, please further refer to Fig. 1, waterflood path 3 can also be connected to return flow line 4 in the lower section of heating tube 2, than Such as can packer 5 be set in the lower section of heating tube 2, the packer 5 between center oil pipe 1 and casing 100 for will be formed by Oil jacket annular space is separated into annular space 6 and lower annular space 7;Inject hot water flowing in upper annular space 6 of waterflood path 3.That is, above-mentioned note It is connected to by upper annular space 6 with realizing between aquaporin 3 and return flow line 4.
Above structure be arranged, can not only avoid injection hot water along 100 bottom of oil jacket annular space sleeve pipe and caused by The problem of viscous crude moisture content rises, but also the larger problem of hot water usage amount is prevented, it is produced into advantageously reduce This.
Packer 5 is by elastic sealing elements to insulate the underground of the oil jacket annular space between casing 100 and center oil pipe 1 Tool is the indispensable tool of oil extraction in oil field.
The present embodiment is not specially limited used packer 5, can be self-sealing, expanding compression and group It is box-like etc..Such as can be common packer 5 in current oil extraction, such as model Y111, Y211, Y221, Y341, The packer product obtained after the packer 5 or above-mentioned packer 5 of K331, K344 etc. are further improved.
The present embodiment is not specially limited the shape and size of above-mentioned heating tube 2, as long as center can be set in Outside oil pipe 1, the waterflood path 3 of sufficient space is formed with center oil pipe 1, and the reflux of sufficient space is formed between casing 100 Channel 4, such as its cross section can be circular or ellipse, can also be the polygons such as triangle, quadrangle.As The cross section of a kind of preferred scheme, heating tube 2 is circular.
Further, between heating tube 2 and center oil pipe 1 can be coaxial arrangement, then the waterflood path 3 formed it is transversal Face is the annulus of regular shape, and the hot water in waterflood path 3 is enable to be evenly heated the viscous crude in center oil pipe 1, profit In the smooth exploitation of viscous crude.
It, then can be further coaxial with casing 100 by heating tube 2 and center oil pipe 1 since casing 100 is generally pylindrical Setting, and the space (volume) that controls waterflood path 3 is roughly the same with the space of return flow line 4 or the sky of waterflood path 3 Between be not more than return flow line 4 space, enable the hot water injected into waterflood path 3 through return flow line 4 smoothly be discharged, realize The good circulation of hot water and sufficient heat exchange with viscous crude, ensure being smoothed out for thickened oil recovery.
Optionally, the inner diameter values of heating tube 2 are the average value of 100 inner diameter values of 1 inner diameter values of center oil pipe and casing, such as in The internal diameter of heart oil pipe 1 be a, heating tube 2 internal diameter be b, casing 100 internal diameter be c, then b=(a+c)/2.It can make note in this way The space of aquaporin 3 is slightly less than the space of return flow line 4, then the hot water in waterflood path 3, can be through reflux after heat exchange Channel 4 is smoothly discharged, while guaranteeing the viscous crude temperature in promotion center oil pipe 1, and reaching, which reduces Viscosity of Heavy Crude Oil, realizes normally The purpose of production.
Optionally, the inner diameter values of heating tube 2 are the root mean square of 100 inner diameter values of 1 inner diameter values of center oil pipe and casing, such as in The internal diameter of heart oil pipe 1 be a, heating tube 2 internal diameter be b, casing 100 internal diameter be c, thenIt can make note in this way Aquaporin 3 is identical as the space of return flow line 4, and the hot water in waterflood path 3, can be suitable through return flow line 4 after heat exchange Profit discharge, while guaranteeing the viscous crude temperature in promotion center oil pipe 1, reaching, which reduces Viscosity of Heavy Crude Oil, realizes the mesh normally produced 's.
The temperature of the above-mentioned hot water for being heated to the viscous crude in center oil pipe 1, can according to the viscosity of practical viscous crude, The factors such as the circulation rate of speed, hot water that viscous crude flows up in center oil pipe 1 are flexibly rationally arranged, make through superheated water with After heat exchange between viscous crude, the temperature of viscous crude can reach critical point temperature.The critical point temperature refers to critical at this Viscosity of Heavy Crude Oil at a temperature of point can ensure that viscous crude successfully can be given rise to ground from center oil pipe 1, realize normal production.
For example the critical point temperature of viscous crude is 40 DEG C or so, then the temperature of hot water is in general control injection waterflood path 3 50 DEG C~90 DEG C;After heat exchange, the hot water temperature being discharged from return flow line 4 is generally 40 DEG C or so;Certainly, if viscous crude Critical point temperature is 10 DEG C or so, can suitably reduce the temperature of hot water.
Further, above-mentioned flow string can also include the heating device (not shown) being arranged above heating tube 2, should Heating device injects water filling for being heated to the hot water in waterflood path 3 to be implanted after so that hot water is reached suitable temperature In channel 3.
It further, should to realize that recycling for hot water, above-mentioned flow string can also include circulating pump (not shown) Circulating pump can be connect with heating device, for example can be connected between heating device and waterflood path 3, alternatively, the circulating pump It can also be arranged between return flow line 4 and heating device.
By the setting of the circulating pump, continue after capable of being heated to suitable temperature from the water being discharged in return flow line 4 It is injected into waterflood path 3, to realize recycling for hot water, avoids the waste of hot water, advantageously reduce production cost.
Also, the injection rate (i.e. circulation rate) that hot water can also be adjusted by circulating pump, makes the heat in return flow line 4 Water can fully heat the viscous crude in center oil pipe 1, improve thickened oil recovery yield.
Device for producing thickened oil provided in this embodiment can be adapted for flowing well relatively conventional in current thickened oil recovery, It is readily applicable to machine-pumped oil well.Wherein, for machine-pumped oil well, above-mentioned flow string, which can further include oil well pump, (does not scheme Show), which connect with center oil pipe 1, and power is provided with the flowing for the viscous crude in center oil pipe 1.
Specifically, above-mentioned oil well pump is generally arranged in center oil pipe 1, for example, can with 1 middle part of centrally disposed oil pipe, Can be with 1 middle part of centrally disposed oil pipe position on the lower side, distance can be according to practical casing between 1 lower end of center oil pipe The conditions such as pressure of viscous crude are rationally arranged in 100, can viscous crude be given rise to ground.
Center oil pipe 1 is that former oil and gas etc. is transported from reservoir to the pipeline to ground after the completion of probing.This implementation Example is not specially limited the structure and material of center oil pipe 1, can be institute's common center oil pipe in current thickened oil recovery 1。
Please further refer to Fig. 3, which such as may include more pipe nipples 11, spiral shell between adjacent pipe nipple 11 Line connects, so as to form center oil pipe 1.Also, can also rationally it be arranged short according to 300 depth of pit shaft of practical heavy oil wells The quantity and length of section 11.
Specifically, above-mentioned pipe nipple 11 is usually the steel pipe with regular length, specific material and pipe thickness are with can Bear subject to the pressure generated during thickened oil recovery, for example, the general adoptable steel pipe trade mark be J55, K55, N80, L80 and P110 etc., pipe thickness is generally 6mm~18mm or so.
Specifically, screw thread can be equipped at 11 both ends of above-mentioned pipe nipple, adjacent pipe nipple 11 is enable to realize threaded connection;Or Person realizes the threaded connection between adjacent pipe nipple 11 as shown in figure 3, the reducer union 12 mating with pipe nipple 11 can also be equipped with.
The device for producing thickened oil that the present embodiment is provided can drop heavy oil heating by hot-water flooding and stick, meet viscous crude The requirement of exploitation improves thickened oil recovery amount and oil well producing level.Also, also helping reduces thickened oil recovery cost and follow-up Viscous crude processing cost.
Finally it should be noted that:The above various embodiments is only to illustrate the technical solution of the utility model, rather than limits it System;Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should Understand:It still can be with technical scheme described in the above embodiments is modified, either to which part or whole Technical characteristic carries out equivalent replacement;And these modifications or replacements, this practicality that it does not separate the essence of the corresponding technical solution are new The range of each embodiment technical solution of type.

Claims (10)

1. a kind of flow string, which is characterized in that including:It center oil pipe for being plugged in casing and is set in described Heating tube on the outside of the oil pipe upper end of center;
Waterflood path is formed between the inner surface of the heating tube and the center oil pipe;The outer surface of the heating tube be used for Return flow line is formed between described sleeve pipe, is connected between the waterflood path and the return flow line.
2. flow string according to claim 1, which is characterized in that the waterflood path is with the return flow line described The lower section of heating tube is connected to.
3. flow string according to claim 2, which is characterized in that further include the packing being arranged below the heating tube Device,
The packer is separated into upper annular space and lower ring for will be formed by oil jacket annular space between the center oil pipe and casing It is empty;
The hot water for injecting the waterflood path flows in the upper annular space.
4. flow string according to claim 1, which is characterized in that the heating tube is set with the center oil pipe coaxial It sets.
5. flow string according to claim 1 or 4, which is characterized in that the inner diameter values of the heating tube are the centers The root mean square of pipe aperture value and described sleeve pipe inner diameter values.
6. flow string according to claim 1, which is characterized in that further include the heating being arranged above the heating tube Device, the heating device is for heating the hot water in the waterflood path to be implanted.
7. flow string according to claim 6, which is characterized in that further include circulating pump, the circulating pump is arranged in institute It states between heating device and waterflood path, alternatively, the circulating pump is arranged between the return flow line and heating device.
8. flow string according to claim 1, which is characterized in that the center oil pipe includes more pipe nipples, adjacent It is threadedly coupled between pipe nipple, forms the center oil pipe.
9. the flow string according to claim 1 or 8, which is characterized in that further include oil well pump, the oil well pump with it is described Center oil pipe connection, power is provided with the flowing for the viscous crude in the oil pipe of center.
10. a kind of device for producing thickened oil, which is characterized in that including adopting described in any one of production tree and claim 1-9 Tubing string;
The production tree includes production tree ontology, and the tubing hanger and casing hanger being connect respectively with the production tree ontology;
The tubing hanger is connect with the center oil pipe, described sleeve pipe extension connect with the heating tube, described sleeve pipe extension for Described sleeve pipe connects.
CN201721679425.5U 2017-12-06 2017-12-06 A kind of flow string and device for producing thickened oil Active CN207686693U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110863797A (en) * 2018-08-28 2020-03-06 中国石油化工股份有限公司 Natural gas well gas production tree circulating heating device and using method thereof
CN111287707A (en) * 2020-02-19 2020-06-16 西南石油大学 Device and method for realizing resistance reduction of thickened oil by utilizing wake flow to generate electricity and heat seawater

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110863797A (en) * 2018-08-28 2020-03-06 中国石油化工股份有限公司 Natural gas well gas production tree circulating heating device and using method thereof
CN110863797B (en) * 2018-08-28 2023-09-26 中国石油化工股份有限公司 Natural gas well gas production tree circulation heating device and application method thereof
CN111287707A (en) * 2020-02-19 2020-06-16 西南石油大学 Device and method for realizing resistance reduction of thickened oil by utilizing wake flow to generate electricity and heat seawater
CN111287707B (en) * 2020-02-19 2021-09-21 西南石油大学 Device and method for realizing resistance reduction of thickened oil by utilizing wake flow to generate electricity and heat seawater

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