CN105756643B - A kind of SAGD horizontal well system and its starting method - Google Patents
A kind of SAGD horizontal well system and its starting method Download PDFInfo
- Publication number
- CN105756643B CN105756643B CN201410790428.0A CN201410790428A CN105756643B CN 105756643 B CN105756643 B CN 105756643B CN 201410790428 A CN201410790428 A CN 201410790428A CN 105756643 B CN105756643 B CN 105756643B
- Authority
- CN
- China
- Prior art keywords
- horizontal well
- water
- pipe
- steam injection
- sagd
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
- Earth Drilling (AREA)
Abstract
The present invention provides a kind of SAGD horizontal well system and its starting methods.The SAGD horizontal well system, including two horizontal wells, and two horizontal wells are upper horizontal well and lower horizontal well, the first steam injection pipe and the second steam injection pipe are provided in above-mentioned each horizontal well, the SAGD horizontal well system further includes at least one water injection unit, and water injection unit is connected to by the first steam injection pipe or the second steam injection pipe at least one horizontal well.By the way that at least one water injection unit is arranged in SAGD horizontal well system, utilize the reservoir in the pressure transformation SAGD horizontal well of water, improve the porosity and permeability of near wellbore zone oil reservoir, the connection between SAGD horizontal well can be realized within a short period of time, substantially reduce the starting time of SAGD horizontal well system early period, and it is since the connection between steam injection well and producing well is improved, and increases the oil production of later period SAGD horizontal well.
Description
Technical field
The present invention relates to the fields of oil exploitation, in particular to a kind of SAGD horizontal well system and its starting method.
Background technique
SAGD is to be used for the maximally efficient technology of super heavy oil development in the world at present.The technique was divided into for two big stages, starting
Stage and production phase.Startup stage, universal method was that the steam injection simultaneously of upper and lower horizontal well carries out circulation preheating in the world, was passed through
Heat transfer heats oil reservoir around pit shaft, reduces viscosity, gradually builds up horizontal well heating power and hydraulic communication passages up and down.Starting terminates
It is transferred to the SAGD production phase afterwards, horizontal well continues steam injection on the production phase, and lower horizontal well continuously recovers the oil.
Compared with external super-heavy oil deposit, domestic super-heavy oil deposit common manifestation goes out that viscosity is high, permeability is low, oil reservoir is non-
The strong aspect disadvantage of matter.Reservoir characteristics difference causes the SAGD well starting period long, and production effect is poor, vapor chamber development is uneven, mesh
Before, the domestic SAGD horizontal well starting period is average, and up to 6 months, longest reached 1 year, and foreign countries SAGD starting is averagely about 3
Month, the longer starting period largely influences SAGD exploitation gas oil ratio and economic benefit.
Meanwhile being influenced by oil reservoir is heterogeneous, circulation preheats established connection uniformity and is also affected, the well of physical property difference
Connecting degree is low after section preheating, and required preheating time is longer.In addition, conventional steam injected cycle preheating mode is largely
Influenced by wellbore trace drift rate, injection-production well hangs down away from bigger, correspondingly needed for foundation connection time it is longer.Thus may be used
See, conventional steam injected cycle preheating mode has the problems such as the starting period is long, connection uniformity coefficient is low.Just because of circulation
Preheating is there are after above-mentioned deficiency, and when going to SAGD production process, the low influence draining speed of Reservoir Permeability directly affects oil-producing speed
Degree.
Based on the above issues, it is necessary to propose a kind of method, it is pre- to solve prior art steam injected cycle in the prior art
Hot mode has that the starting period is long, connection uniformity coefficient is low.
Summary of the invention
The main purpose of the present invention is to provide a kind of SAGD horizontal well system and its starting methods, to solve the prior art
It is middle to there is a problem of that steam injected cycle preheating mode is long in the presence of the starting period, connection uniformity coefficient is low.
To achieve the goals above, according to an aspect of the invention, there is provided a kind of SAGD horizontal well system, including two
A horizontal well, and two horizontal wells are upper horizontal well and lower horizontal well, be provided in above-mentioned each horizontal well the first steam injection pipe and
Second steam injection pipe, the SAGD horizontal well system further include at least one water injection unit, and water injection unit passes through the first steam injection pipe or the
Two steam injection pipes are connected to at least one horizontal well.
Further, the length of above-mentioned first steam injection pipe is greater than the length of above-mentioned second steam injection pipe, water injection unit and first
The beginning of steam injection pipe is connected to.
Further, above-mentioned water injection unit includes: water storage device；First water-supply-pipe, interconnected water storage device and the first steam injection
Pipe.
Further, above-mentioned water injection unit is connected to upper horizontal well and is connected to lower horizontal well, and the first water-supply-pipe is two,
Respectively upper water-supply-pipe and lower water-supply-pipe, upper water-supply-pipe are connected to the first steam injection pipe of upper horizontal well, lower water-supply-pipe and lower level
First steam injection pipe of well is connected to.
Further, first pressure detection device and first flow control device are provided on above-mentioned first water-supply-pipe.
Further, above-mentioned water injection unit further includes the second water-supply-pipe, and the second steam injection will be come from by being connected to the second steam injection pipe
The water of pipe exports.
Further, above-mentioned second water-supply-pipe is connected to water storage device.
Further, second pressure detection device and second flow control device are provided on above-mentioned second water-supply-pipe.
Further, the end of the horizontal segment of horizontal well where above-mentioned first steam injection pipe extends to；Above-mentioned second steam injection pipe
Extend to where horizontal well horizontal segment starting point.
Further, it is provided with temperature measuring cable in above-mentioned first steam injection pipe, 30m~50m is provided with one on temperature measuring cable
Temperature measuring point.
According to another aspect of the present invention, a kind of starting method of SAGD horizontal well system, SAGD horizontal well system are provided
System includes two horizontal wells, and two horizontal wells are upper horizontal well and lower horizontal well, the starting method the following steps are included: S1,
Steam circulation preheating is carried out to horizontal well；S2 carries out pressure break to horizontal well using hot water.
Further, the vapor (steam) temperature of above-mentioned steps S1 between 200~300 DEG C and continues 7~10 days.
Further, above-mentioned S2 step is the following steps are included: S21, carries out well-flushing to horizontal well using hot water；S22 is utilized
Hot water carries out pressure break to horizontal well, forms hypertonic band between upper horizontal well and the horizontal segment of lower horizontal well；S23, to horizontal well
Injection steam is recycled.
Further, above-mentioned steps S22 includes: step A, injects hot water in upward horizontal well and lower level, and control heat
The pressure of water is lower than the minimum horizontal principal stress value in corresponding horizontal well；Step B improves the heat hydraulic pressure of upper horizontal well supreme
The fracture pressure of horizontal well carries out pressure break to upper horizontal well；Step C improves the heat hydraulic pressure of lower horizontal well to lower horizontal well
Fracture pressure, to lower horizontal well carry out pressure break, form hypertonic band；Step D, horizontal well is connected to lower horizontal well in judgement
Property, it requires to repeat step A to step C if connectivity is unsatisfactory for recovering the oil.
Further, above-mentioned hot water is de-oiling hot sewage of the temperature at 60~80 DEG C.
It applies the technical scheme of the present invention, by the way that at least one water injection unit is arranged in SAGD horizontal well system, shortens
The starting time of SAGD horizontal well system early period and improve connection uniformity coefficient.SAGD horizontal well is recycled using steam
Preheating, the water filling for after provide certain thermal environment, fill the water to SAGD horizontal well, and SAGD water is transformed using the pressure of water
Reservoir in horizontal well improves the porosity and permeability of near wellbore zone oil reservoir, i.e., forms the biggish height of radius near wellbore zone
Seep band, can be realized in SAGD horizontal well within a short period of time between steam injection well and producing well it is uniform be connected to, substantially reduce
The starting time of SAGD horizontal well system early period, and it is since the connection between steam injection well and producing well is improved, and increases
The oil production of later period SAGD horizontal well is added.
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide further understanding of the present invention, and of the invention shows
Examples and descriptions thereof are used to explain the present invention for meaning property, does not constitute improper limitations of the present invention.In the accompanying drawings:
Fig. 1 shows a kind of structural representation for the SAGD horizontal well system that typical embodiment provides according to the present invention
Figure；
Fig. 2 shows the structural schematic diagrams of the SAGD horizontal well system of embodiment according to the present invention one；
Fig. 3 shows the structural schematic diagram of the SAGD horizontal well system of embodiment according to the present invention two；
Fig. 4 shows the structural schematic diagram of the SAGD horizontal well system of embodiment according to the present invention three；
Fig. 5 shows the structural schematic diagram of the SAGD horizontal well system of embodiment according to the present invention four；
Fig. 6 shows the starting method for the SAGD horizontal well system that another typical embodiment provides according to the present invention
Flow diagram；
Fig. 7 shows the flow diagram of the step S2 of starting method shown in fig. 6；And
Fig. 8 shows the flow diagram of step S22 shown in Fig. 7.Wherein, the above drawings include the following reference numerals:
10, upper horizontal well；
20, lower horizontal well；
60, water injection unit；
30, the first steam injection pipe；
40, the second steam injection pipe；
61, water storage device；
62, the first water-supply-pipe；
621, upper water-supply-pipe；
622, lower water-supply-pipe；
63, first pressure detection device；
64, first flow control device；
65, the second water-supply-pipe；
66, second pressure detection device；
67, second flow control device；
50, temperature measuring cable；
70, blowoff basin.
Specific embodiment
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
Mutually combination.The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
As background technology part is introduced, the starting period of steam injected cycle preheating mode exists in the prior art
Problem long, connection uniformity coefficient is low.In order to solve this problem, in an exemplary embodiment of the invention, it provides
A kind of SAGD horizontal well system, as shown in Figure 1, the SAGD system includes two horizontal wells, and two horizontal wells are upper horizontal well
10 and lower horizontal well 20, the first steam injection pipe 30 and the second steam injection pipe 40 are provided in above-mentioned each horizontal well, it is further above-mentioned
SAGD horizontal well system further includes at least one water injection unit 60, and water injection unit 60 passes through the first steam injection pipe 30 or the second steam injection pipe
40 are connected to at least one horizontal well.
The present invention is utilized in horizontal well by the way that at least one water injection unit 60 is arranged in SAGD horizontal well system
First steam injection pipe 30 or the second steam injection pipe 40 are connected to realization with water injection unit 60 and fill the water into horizontal well, and structure is simple and shortens
The starting time of SAGD horizontal well system early period and improve connection uniformity coefficient.SAGD horizontal well is recycled using steam
Preheating, the water filling for after provide certain thermal environment, fill the water to SAGD horizontal well, and SAGD water is transformed using the pressure of water
Reservoir in horizontal well improves the porosity and permeability of near wellbore zone oil reservoir, i.e., forms the biggish height of radius near wellbore zone
Seep band, can be realized in SAGD horizontal well within a short period of time between steam injection well and producing well it is uniform be connected to, substantially reduce
The starting time of SAGD horizontal well system early period, and it is since the connection between steam injection well and producing well is improved, and increases
The oil production of later period SAGD horizontal well is added.
Preferably, as shown in Figure 1, the length of the first steam injection pipe 30 is greater than the length of the second steam injection pipe 40, water injection unit 60
It is connected to the beginning of the first steam injection pipe 30.Entire hydraulic fracturing process can be made to be in a dynamic circulation by two steam injection pipes, into
One step shortens the starting time of SAGD horizontal well system early period.
First steam injection pipe 30 is connected to water injection unit 60, and the length of the first steam injection pipe 30 is greater than the second steam injection pipe 40,
So that being distributed in horizontal well as far as possible by the water that the first steam injection pipe 30 injects, therefore can not only horizontal well be made to be heated evenly
Horizontal well can be made to be pressurized uniformly, the region that hypertonic band is formed can be expanded by being heated evenly, and compression can uniformly make two levels
Connection between well is evenly distributed, and ensure that the connectivity of hypertonic band, and can use the second steam injection pipe 40 for Injection Level
The extraction of well.
In the preferred embodiment of the present invention one, as shown in Fig. 2, above-mentioned water injection unit 60 includes that water storage device 61 and first is defeated
Water pipe 62,62 interconnected water storage device 61 of the first water-supply-pipe and the first steam injection pipe 30.Water in water storage device 61 passes through the first water delivery
Pipe 62 injects the first steam injection pipe 30, is that water injection unit 60 provides stable water source using water storage device 61, ensure that the injecting process
In hydraulic pressure stability.Preferably, it is provided with water pump between water storage device 61 and the first water-supply-pipe 62, provides level for water filling
Pressure needed for well, and by the pressure early period of the adjusting control water filling of water pump lower than the minimum horizontal principal stress in horizontal well
Value adjusts the stress distribution in horizontal well, is gradually increased the pressure of water filling by water pump later, makes the pressure of water filling slightly above most
Small horizontal principal stress value carries out pressure break to horizontal well, forms hypertonic band.It is highly preferred that there is a draw water outside the second steam injection pipe 40
Pump, the parameter setting of the water pump and this suction pump that are arranged between water storage device 61 and the first water-supply-pipe 62 is good, water injecting pump is first opened,
Suction pump is opened again, so that it may which realization fills the water on one side, draws water on one side, so that water is kept certain flow rate, can make to keep phase in horizontal well
To stable temperature and pressure value.
In the SAGD horizontal well system of aforementioned present invention, water injection unit 60 is connected to two horizontal wells, i.e., with upper horizontal well
10 connections and be connected to lower horizontal well 20, i.e., settable first water-supply-pipe 62 is two, as shown in figure 3, of the invention preferred
In embodiment two, the first water-supply-pipe 62 respectively upper water-supply-pipe 621 and lower water-supply-pipe 622, upper water-supply-pipe 621 and upper level are set
First steam injection pipe 30 of well 10 is connected to, and lower water-supply-pipe 622 is connected to the first steam injection pipe 30 of lower horizontal well 20.Pass through above structure
The steam injection of horizontal well 10 and lower horizontal well 20 and the synchronism or otherness of the injecting process can be preferably controlled, while big
The cost for reducing water injection unit 60 greatly, eliminates the setting of extra water injection unit 60.
In order to which the pressure for generating the injecting process meets requirement of the invention, in the preferred embodiment of the present invention one and/or
In embodiment two, it is provided with first pressure detection device 63 and first flow control device 64 on above-mentioned first water-supply-pipe 62, has
Body can refer to Fig. 2 and Fig. 3.In entire the injecting process, first according to the geologic information in the oily region in this hiding, the water of horizontal well is determined
The minimum horizontal principal stress value of earth formation locating for flat section is arranged water filling initial pressure according to minimum horizontal principal stress value, makes
Water injection pressure is slightly less than minimum horizontal principal stress value, while according to the show value of first pressure detection device 63 during water delivery
First flow control device 64 is adjusted at any time, and the pressure value of water filling is made to be slightly less than minimum horizontal principal stress value always as far as possible,
Reduce influence of the pressure disturbance to water filling initial pressure, after the numerical value of first pressure detection device 63 tends towards stability, completion pair
The adjustment of the stress distribution of horizontal segment in horizontal well.Make to fill the water by the flow of the adjustment water filling of first flow control device 64 later
Pressure incrementally increase, until slightly larger than the frac pressure of the minimum horizontal principal stress value in the horizontal segment of horizontal well, then one
This pressure value is directly kept, pressure break is carried out to the horizontal segment of horizontal well, hypertonic band is formed, during which if first pressure detection device 63
It is larger that numerical value adjustment occurs, water injection pressure can be made to be returned to frac pressure value by first flow control device 64.If pressure
It is excessive, it is possible to the bottom cover layer near horizontal well can be destroyed, cause heat losses, be unfavorable for recovering the oil instead.Therefore first pressure is examined
It surveys device 63 and first flow control device 64 plays insignificant effect in entire the injecting process, iterate through matching for the two
Conjunction makes water injection pressure maintain initial pressure or frac pressure, so as to smoothly completing for fracturing process.
In a preferred embodiment of the present invention, above-mentioned water injection unit 60 further includes second water delivery of the second water-supply-pipe 65
Pipe 65 is connected to the second steam injection pipe 40 to be exported from the water of the second steam injection pipe 40.The outlet of the second water-supply-pipe 65 can be put at this time
Blowoff basin 70 is set, the water filling excluded from horizontal well can be focused on, after entire hydraulic fracturing process, by note used
Water concentrates discharge, is good for the environment.Further, it is preferable to the outlet of the second water-supply-pipe 65 is connected with water storage device 61, this
The setting of structure can recycle water filling, can distinguish shape when above structure is applied in above-described embodiment two and embodiment three
At Fig. 4 and structure shown in fig. 5.The water filling of exclusion can thus be entered in horizontal well again by the first water-supply-pipe 62
First steam injection pipe 30 carries out hydraulic fracturing, has achieved the purpose that recycle water filling.
Equally, in order to cooperate the speed of water filling, is provided on the second water-supply-pipe 65 preferably in the above embodiments
Two pressure-detecting devices 66 and second flow control device 67, for details, reference can be made to three Hes of embodiment that Fig. 4 and Fig. 5 are shown respectively
The structural schematic diagram of the SAGD horizontal well system of example IV.When filling the water in Horizontal Well Flow, residual mud can be encountered, coagulated
The objects phase such as Guyuan oil has slackened the pressure of water filling, therefore the pressure that the first pressure detection device 63 on the first water-supply-pipe 62 is shown
Numerical value, which is possible to be greater than in horizontal well, fills the water instant actual pressure, and may cause during hydraulic fracturing due to pressure
Deficiency keeps the connection of upper and lower two horizontal wells insufficient.And the pressure that the second pressure detection device 66 on the second water-supply-pipe 65 is shown
Power numerical value is then the water injection pressure in water filling progress fracturing process or after fracturing process, and opposite first pressure detection device 63 is aobvious
Actual pressure value of the pressure value shown closer to water filling in horizontal well, therefore when entire the injecting process is in a self-loopa state
When, the pressure value that can be more shown with reference to second pressure detection device 66, and then pass through first flow control device 64
The flow filled the water with the adjustment of second flow control device 67, so as to adjust pressure of the water filling in horizontal well.
In order to preferably utilize effect of the injected water to horizontal well, preferably the first steam injection pipe 30 of the various embodiments described above
The end of the horizontal segment of horizontal well where extending to；The starting of the horizontal segment for extending to place horizontal well of second steam injection pipe 40
End.That is the first steam injection pipe 30 and 40 length difference of the second steam injection pipe are the length of the horizontal segment of horizontal well, be ensure that greatest extent
The forming region of hypertonic band, which combines, considers efficiency of drawing water.
Preferably, it is provided with temperature measuring cable 50 in the first steam injection pipe 30,30m~50m is provided with one on temperature measuring cable 50
Temperature measuring point.By taking Fig. 1 as an example, the main connectivity for judging lower horizontal well 20 and upper horizontal well 10 of the setting of temperature measuring point, and then determine
Whether hydraulic fracturing process is terminated.With the progress of hydraulic fracturing process, can uniformly go out between the horizontal segment of upper and lower horizontal well 20
Now more and more holes make the connection of horizontal well 20 up and down, with the water filling meeting of horizontal well 10 in the connection of upper and lower horizontal well 20
Lower horizontal well 20 is gradually flowed into, simultaneous heat makes lower horizontal well 20 from the transfer of upper 10 downward horizontal well 20 of horizontal well
In temperature be gradually increased, and then be reflected in the rising of thermometric point value, i.e. different location temperature measuring point in the horizontal segment of horizontal well
Numerical value reach target temperature after, just represent the connection of horizontal well 20 up and down and reached target initially set, can stop
The progress of hydraulic fracturing process.
In the typical embodiment of another kind of the invention, a kind of starting side of SAGD horizontal well system is additionally provided
Method, which includes two horizontal wells, and two horizontal wells are upper horizontal well 10 and lower horizontal well 20, the starting
Method carries out steam circulation preheating to horizontal well the following steps are included: S1；S2 carries out pressure break to horizontal well using hot water, such as schemes
Shown in 6 flow charts.It is as mentioned above, a thermal environment is provided to the hydraulic fracturing after horizontal well first with steam,
Then hydraulic fracturing is carried out to horizontal well using water filling, improves the porosity and permeability of near wellbore zone oil reservoir, i.e., in nearly well
Band forms the biggish hypertonic band of radius, realizes the company in SAGD horizontal well within a short period of time between steam injection well and producing well
It is logical, substantially reduce the starting time of SAGD horizontal well system early period.The oil production of later period SAGD horizontal well is also increased simultaneously.
Preferably, the vapor (steam) temperature of step S1 between 200~300 DEG C and continues 7~10 days.Water filling can be made to have one
A preferable thermal environment greatly reduces the heat loss of water filling early period, reduces the water injection rate of hydraulic fracturing process, can reduce correlation
Cost.
In another preferred embodiment of the present invention, as shown in fig. 7, above-mentioned S2 step is the following steps are included: S21, benefit
Well-flushing is carried out to horizontal well with hot water；S22 carries out pressure break to horizontal well using hot water, in upper horizontal well 10 and lower horizontal well 20
Hypertonic band is formed between horizontal segment；S23 is recycled to horizontal well injection steam.
Horizontal well is rinsed using hot water in S21 step, the solidification oil in horizontal well, residual mud are disposed,
The actual value of water injection pressure and the error of target value minimize as far as possible during guarantee hydraulic fracturing；It is sharp in S22 step
Hypertonic band is formed between upper horizontal well and the horizontal segment of lower horizontal well with the pressurising of hot water.Since S22 carries out the process of pressure break
Being formed by crack is microcrack, and along net horizontal section distributing homogeneity and involves degree and may not be able to meet immediately using wanting
It asks, therefore further injects into steam circulation (usual 1~2 month) for a period of time, the equal of upper and lower horizontal interwell communication is reinforced with this
Even property and connecting degree provide adequate condition to turn SAGD production.
It is highly preferred that into the upper horizontal well and lower horizontal well, injection is hot as shown in figure 8, step S22 includes: step A
Water, and the pressure for controlling hot water is lower than the minimum horizontal principal stress value in corresponding horizontal well；Step B, by the hot water of upper horizontal well
Pressure improves the fracture pressure of supreme horizontal well, carries out pressure break to upper horizontal well；Step C mentions the heat hydraulic pressure of lower horizontal well
The fracture pressure for up to descending horizontal well carries out pressure break to lower horizontal well, and hypertonic band is stated in formation；Step D judges the upper horizontal well
Connectivity is carried out with the lower horizontal well, if connectivity is unsatisfactory for connectivity platform and repeats step A to step C.
After upward horizontal well and lower horizontal well injection hot water, injected hot water is then detected by ground detection system
Pressure, in the initial stage of injection hot water, the pressure for controlling hot water is lower than the minimum horizontal principal stress value corresponded in horizontal well, makes
Hot water plays enough preheatings and initial course of exerting pressure, and does not destroy the structure of reservoir in horizontal well；Then, by upper horizontal well
The fracture pressure that heat hydraulic pressure improves supreme horizontal well carries out hydraulic fracturing to upper horizontal well 10 first, due to gravity, note
The pressure of water is more implemented in the horizontal segment oil reservoir below of upper horizontal well 10, i.e., below the horizontal segment of upper horizontal well 10
Oil reservoir in will form more holes；Then, the heat hydraulic pressure of lower horizontal well is improved to the fracture pressure of lower horizontal well, it is right
Lower horizontal well 20 carries out hydraulic fracturing, due in step S22 first in the lower section oil reservoir of the horizontal segment of upper horizontal well 10, i.e., under
The top oil reservoir of the horizontal segment of horizontal well 20 forms new more holes, therefore new hole will disperse lower horizontal well later
Water injection pressure in 20 reduces the water injection pressure in lower horizontal well 20 to the pressure of reservoir below the horizontal segment of lower horizontal well 20
Power reduces the risk for crushing bottom cover layer as far as possible.
After forming hypertonic band, being connected to for upper horizontal well and lower horizontal well can be judged using temperature and pressure method for comprehensive detection
Property, for example upward horizontal well is passed through hot steam, detects the temperature of lower horizontal well, if the temperature in two horizontal wells is close,
Determine that connectivity is preferable, the stages operating can be terminated；Otherwise it repeats step A to C and carries out pressure break again.
Above-mentioned temperature and pressure method for comprehensive detection includes:
Temperature judges: steam injection well is injects process, and producing well is stewing well state (temperature can continue to decline), and steam injection well continues
About 70 DEG C of hot sewage are injected, if existing part connection between steam injection well, producing well, the temperature of Connectivity Section temperature measuring point will be under first
Ascendant trend after drop, according to experience early period, it is more than 50% that length (first drops and rise afterwards) in temperature-responsive section, then illustrates that connectivity is preferable,
Meet stage transformation purpose.Since there is some difference for each well group connectivity, temperature deterministic process needs 4~6 hours.
Pressure judges: steam injection well is injects process, and producing well is stewing well state, and producing well well head pressure is with steam injection well pressure
Feature with uniformity is risen or fallen, it is more than 0.1MPa that pressure, which is associated with amplitude of variation, then judges that connection preferably, meets the stage
Purpose is transformed.
Preferably, hot water is temperature in 60~80 DEG C of the hot sewage of de-oiling, greatly reduces note using the hot sewage of de-oiling
Water cost, the hot sewage of de-oiling, which has certain temperature, can make the horizontal temperature to keep relative stability, be unlikely to solidify crude oil,
Slacken the pressure of water filling.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (9)
1. a kind of SAGD horizontal well system, including two horizontal wells, and described two horizontal wells are upper horizontal well (10) and are lauched
Horizontal well (20), which is characterized in that the first steam injection pipe (30) and the second steam injection pipe (40) are provided in each horizontal well, it is described
SAGD horizontal well system further includes at least one water injection unit (60), and the water injection unit (60) passes through the first steam injection pipe
(30) or the second steam injection pipe (40) is connected to horizontal well described at least one；
Wherein, the length of the first steam injection pipe (30) is greater than the length of the second steam injection pipe (40), the water injection unit
(60) it is connected to the beginning of the first steam injection pipe (30)；
Wherein, the water injection unit (60) includes:
Water storage device (61),
First water-supply-pipe (62) is connected to the water storage device (61) and the first steam injection pipe (30)；
Wherein, the water injection unit (60) is connected to the upper horizontal well (10) and is connected to the lower horizontal well (20), described
First water-supply-pipe (62) is two, respectively upper water-supply-pipe (621) and lower water-supply-pipe (622), the upper water-supply-pipe (621) and institute
State the first steam injection pipe (30) connection of horizontal well (10), the lower water-supply-pipe (622) and the first of the lower horizontal well (20)
Steam injection pipe (30) connection,
The end of the horizontal segment of horizontal well where the first steam injection pipe (30) extends to；
The starting point of the horizontal segment for extending to place horizontal well of the second steam injection pipe (40).
2. SAGD horizontal well system according to claim 1, which is characterized in that be provided on first water-supply-pipe (62)
First pressure detection device (63) and first flow control device (64).
3. SAGD horizontal well system according to claim 2, which is characterized in that the water injection unit (60) further includes second
Water-supply-pipe (65), being connected to the second steam injection pipe (40) will export from the water of the second steam injection pipe (40).
4. SAGD horizontal well system according to claim 3, which is characterized in that second water-supply-pipe (65) and the storage
Water installations (61) connection.
5. SAGD horizontal well system according to claim 3, which is characterized in that be provided on second water-supply-pipe (65)
Second pressure detection device (66) and second flow control device (67).
6. SAGD horizontal well system according to claim 5, which is characterized in that be provided in the first steam injection pipe (30)
Temperature measuring cable (50) is provided with a temperature measuring point every 30m~50m on the temperature measuring cable (50).
7. a kind of starting method of SAGD horizontal well system, the SAGD horizontal well system includes two horizontal wells, and described two
A horizontal well be upper horizontal well (10) and lower horizontal well (20), which is characterized in that the starting method the following steps are included:
S1 carries out steam circulation preheating to the horizontal well；
S2 carries out pressure break to the horizontal well using hot water；
Wherein, the S2 step the following steps are included:
S21 carries out well-flushing to the horizontal well using the hot water,
S22 carries out pressure break to the horizontal well using the hot water, in the horizontal segment of the upper horizontal well and the lower horizontal well
Between form hypertonic band,
S23, Xiang Suoshu horizontal well injection steam are recycled；
Wherein, the step S22 includes:
Step A, the pressure injected hot water into the upper horizontal well and the lower level, and control the hot water are lower than corresponding institute
The minimum horizontal principal stress value in horizontal well is stated,
The heat hydraulic pressure of the upper horizontal well is improved the fracture pressure of supreme horizontal well by step B, is carried out to the upper horizontal well
Pressure break,
Step C improves the heat hydraulic pressure of the lower horizontal well to the fracture pressure of lower horizontal well, carries out to the lower horizontal well
Pressure break forms the hypertonic band,
Step D judges that the upper horizontal well and the lower horizontal well carry out connectivity, wants if the connectivity is unsatisfactory for connectivity
Ask repeating said steps A to the step C.
8. starting method according to claim 7, which is characterized in that the vapor (steam) temperature of the step S1 200~
Between 300 DEG C and continue 7~10 days.
9. starting method according to claim 7, which is characterized in that the hot water is de-oiling heat of the temperature at 60~80 DEG C
Sewage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410790428.0A CN105756643B (en) | 2014-12-17 | 2014-12-17 | A kind of SAGD horizontal well system and its starting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410790428.0A CN105756643B (en) | 2014-12-17 | 2014-12-17 | A kind of SAGD horizontal well system and its starting method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105756643A CN105756643A (en) | 2016-07-13 |
| CN105756643B true CN105756643B (en) | 2019-10-11 |
Family
ID=56340375
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410790428.0A Active CN105756643B (en) | 2014-12-17 | 2014-12-17 | A kind of SAGD horizontal well system and its starting method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105756643B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108386174B (en) * | 2018-03-14 | 2020-11-03 | 西南石油大学 | SAGD horizontal well uniform steam injection pipe column and process |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102678096A (en) * | 2012-05-08 | 2012-09-19 | 中国石油天然气股份有限公司 | Hot water assisted gravity drainage method for mining high pour-point oil deposit |
| CN103615225A (en) * | 2013-11-28 | 2014-03-05 | 中国石油天然气股份有限公司 | Mid-depth layer oil reservoir double-horizontal-well equal-temperature-difference forced steam circulation preheating method |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7090014B2 (en) * | 1999-10-26 | 2006-08-15 | Alberta Science And Research Authority | Process for sequentially applying SAGD to adjacent sections of a petroleum reservoir |
| US7621326B2 (en) * | 2006-02-01 | 2009-11-24 | Henry B Crichlow | Petroleum extraction from hydrocarbon formations |
| CN102444397A (en) * | 2011-10-24 | 2012-05-09 | 国鼎(大连)投资有限公司 | Method of exploiting deep layer oil shale to manufacture shale oil and oil shale gas |
| CN102518415B (en) * | 2011-12-13 | 2015-07-08 | 中国石油天然气股份有限公司 | Method for draining oil from fractured single horizontal well under gravity of force by using steam |
| CN103114836B (en) * | 2013-02-21 | 2016-03-23 | 中国海洋石油总公司 | A kind of Apparatus for () and method therefor of steam heavy oil heat production |
| CN103939069B (en) * | 2014-03-13 | 2015-07-01 | 中国石油大学(北京) | Steam-gas displacement and gravity oil drain composite exploiting method |
| CN204457702U (en) * | 2014-12-17 | 2015-07-08 | 中国石油天然气股份有限公司 | A kind of SAGD horizontal well system |
-
2014
- 2014-12-17 CN CN201410790428.0A patent/CN105756643B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102678096A (en) * | 2012-05-08 | 2012-09-19 | 中国石油天然气股份有限公司 | Hot water assisted gravity drainage method for mining high pour-point oil deposit |
| CN103615225A (en) * | 2013-11-28 | 2014-03-05 | 中国石油天然气股份有限公司 | Mid-depth layer oil reservoir double-horizontal-well equal-temperature-difference forced steam circulation preheating method |
Non-Patent Citations (1)
| Title |
|---|
| Geomechanics for the Thermal Stimulation of Heavy Oil Reservoirs-Canadian Experience;Yuan et.al;《Society or Petroleum Engineers》;20110101;Introduction部分第2-5段 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105756643A (en) | 2016-07-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109977612A (en) | A kind of pressure break new process suitable for encrypting exploitation shale gas well | |
| CA2913140C (en) | Radial fishbone sagd | |
| CN106567702A (en) | Method for improving complexity index of deep shale gas fracture | |
| CN101089362B (en) | Improved steam oil production method | |
| CN102518415B (en) | Method for draining oil from fractured single horizontal well under gravity of force by using steam | |
| CN107091074B (en) | Method for exploiting deep bottom water heavy oil reservoir | |
| WO2019218798A1 (en) | Extra-heavy oil development method for strengthening sagd steam chamber so as to break through low-physical-property reservoir | |
| US7090014B2 (en) | Process for sequentially applying SAGD to adjacent sections of a petroleum reservoir | |
| RU2387819C1 (en) | Method to develop sticky oil and bitumen accumulation | |
| CN108131124A (en) | A kind of method using solvent and superheated steam assisted gravity drainage | |
| CN204457702U (en) | A kind of SAGD horizontal well system | |
| CN110284861A (en) | A method of intrinsic fracture heavy crude reservoir is exploited using Degradable temporary blocking agent auxiliary SAGD | |
| RU2675114C1 (en) | Method of super-viscous oil field development | |
| CA2251157C (en) | Process for sequentially applying sagd to adjacent sections of a petroleum reservoir | |
| RU2504647C2 (en) | Method of high-viscosity oil pool development | |
| RU2455473C2 (en) | Development method of high-viscosity oil and bitumen deposit | |
| CN105756643B (en) | A kind of SAGD horizontal well system and its starting method | |
| RU2307242C1 (en) | High-viscosity oil production method | |
| CA2902591C (en) | Axially segmented depletion operations in horizontal wells | |
| CN115324545B (en) | Variable pressure steam assisted heavy oil drainage thick oil exploitation method | |
| CN107701158B (en) | The method for exploiting foam type extra heavy oil | |
| RU2310744C1 (en) | Method for heavy and/or highly-viscous hydrocarbon production from underground deposit | |
| Hall et al. | Operation and performance of the Slocum thermal recovery project | |
| RU2483207C2 (en) | Development method of fractured high-viscosity oil deposit | |
| RU2339808C1 (en) | Method for extraction of heavy and high viscous hydrocarbons out of underground deposit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |