CN103615225B - The temperature difference such as mid-deep strata oil reservoir dual horizontal well force steam circulation pre-heating mean - Google Patents
The temperature difference such as mid-deep strata oil reservoir dual horizontal well force steam circulation pre-heating mean Download PDFInfo
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Abstract
The present invention proposes that the temperature difference pressure steam circulation pre-heating mean such as a kind of temperature difference such as mid-deep strata oil reservoir dual horizontal well pressure steam circulation pre-heating mean, described mid-deep strata oil reservoir dual horizontal well includes：Step A：Select qualified oil reservoir；Step B：Dual horizontal well is affixed one's name in the middle part of the qualified oil reservoir；Step C：Steam soak exploitation is carried out simultaneously to upper horizontal well and lower horizontal well, the qualified oil reservoir is depressurized to below 3.5MPa；Step D：Horizontal well steam injection tubing string and upper horizontal well machinery lifting tubing string on entering under in the upper horizontal well of the dual horizontal well, in the lower horizontal well of dual horizontal well under enter lower horizontal well steam injection tubing string and lower horizontal well machinery lifting tubing string；Step E：Circulation preheating, upper horizontal well and lower horizontal well carry out continuous injection extraction simultaneously, steam are injected simultaneously in upper horizontal well and lower horizontal well, while using mechanical lift back production condensate liquid, condensate liquid in upper horizontal well is produced by upper horizontal well, and the condensate liquid of lower horizontal well is produced by lower horizontal well.
Description
Technical field
Field is adopted the present invention relates to oil note, and in particular to a kind of temperature difference such as mid-deep strata oil reservoir dual horizontal well forces steam to follow
Ring pre-heating mean, i.e. one kind realize super dense oil reservoir in middle and deep layer oil reservoir dual horizontal well SAGD（SAGD）Efficiently, it is balanced
Preheating starting method.
Background technology
SAGD（SAGD）It is the effective technology means for developing heavy crude reservoir, in stratum initial condition
Under the high viscosity oil without fluid ability, oil reservoir warm-up phase need to be experienced, realize the thermal communication between injection-production well, be fully warmed-up
Oil reservoir is the premise for realizing gravity drainage.
For the thermal communication for setting up dual horizontal well combination S AGD notes, adopt between well typically takes two kinds of modes of preheating, that is, steam
Vapour is handled up and is preheated and steam circulation preheating.
Wherein steam soak preheating is upper and lower horizontal well while carrying out steam soak exploitation, it is therefore an objective to reduce strata pressure,
Thermal communication is set up, warm-up phase of handling up can finally make horizontal well interwell communication temperature reach 80 DEG C, and pressure drops to 3MPa or so,
Stage recovery percent of reserves can reach 21%.But steam soak preheating can not uniform heat levels section, with the increase of round of handling up,
Thermal field is more serious in sexual development, non-homogeneous degree is inherited, so, fully rely on high pressure and handle up production to reach acquirement thermal communication
Purpose, often causes horizontal segment to heat uneven, will restrict and be transferred to production effect after SAGD exploitations, reduces final harvesting
Rate.
Circulation preheating refers to that high-temperature steam is not entering oil reservoir（Or very small amount enters oil reservoir）In the case of heated oil reservoir, steam
Vapour is only enclosed in horizontal well interior circulation one, therefore claims circulation preheating.Enough long-times are theoretically carried out in injection-production well（2-4
Month）Steam circulation after, can set up thermal communication between injection-production well, and horizontal segment can obtain uniform heating.But in practical application
The self-loopa preheating of steam is only realized in Shallow Heavy Oil Reservoir, for mid-deep strata heavy crude reservoir（600-1000m）, due to steam
Pressure of handling up is lower compared with shallow-layer, for example, developed oil reservoir is depressurized to 3-4MPa in steam soak, it is high in mid-deep strata heavy crude reservoir
Warm water is difficult to self-loopa, and the circulation preheating of mid-deep strata heavy crude reservoir is difficult to, and limits mid-deep strata heavy crude reservoir
Exploitation.
The content of the invention
The present invention provides a kind of temperature difference such as mid-deep strata oil reservoir dual horizontal well and forces steam circulation pre-heating mean, with for middle depth
The circulation Preheating of layer heavy crude reservoir, mainly solves the problems, such as that the circulation preheating of mid-deep strata heavy crude reservoir is difficult to.
Therefore, the present invention proposes that a kind of temperature difference such as mid-deep strata oil reservoir dual horizontal well force steam circulation pre-heating mean, it is described
The temperature difference such as mid-deep strata oil reservoir dual horizontal well pressure steam circulation pre-heating mean includes：
Step A：The geologic parameter of qualified oil reservoir, the qualified oil reservoir is selected to meet following condition：Reservoir buried depth is 600-
1000m, continuous core intersection is more than or equal to 10m, and vertical permeability and horizontal permeability ratio are more than 0.3；
Step B：Dual horizontal well is set in the qualified oil reservoir, and the dual horizontal well includes：Well spacing is the upper water of 4-6m
Horizontal well and lower horizontal well, the well depth of dual horizontal well are less than 1600 meters, and the horizontal section length of double levels is in more than 300m；
Step C：Steam soak exploitation is carried out simultaneously to upper horizontal well and lower horizontal well, the qualified oil reservoir is depressurized to
Below 3.5MPa；
Step D：Then, in the upper horizontal well of the dual horizontal well under enter on horizontal well steam injection tubing string and upper horizontal well machine
Tool lifts tubing string, deep at the 2/3 of upper horizontal well horizontal segment under upper horizontal well steam injection tubing string, in the lower level of the dual horizontal well
Enter lower horizontal well steam injection tubing string and lower horizontal well machinery lifting tubing string under in well, lower horizontal well is arrived deeply under lower horizontal well steam injection tubing string
At the tiptoe of horizontal segment；
Step E：Then circulation preheating, upper horizontal well and lower horizontal well carry out continuous injection extraction simultaneously, and steam is existed
Injected simultaneously in upper horizontal well and lower horizontal well, while using mechanical lift back production condensate liquid, condensate liquid in upper horizontal well by
Upper horizontal well extraction, the condensate liquid of lower horizontal well is produced by lower horizontal well.
Further, the temperature difference such as mid-deep strata oil reservoir dual horizontal well pressure steam circulation pre-heating mean also includes：Step F：
After circulation preheating 2-4 month, switch to SAGD exploitation, steam injection well steam injection, producing well is depressured production, wherein, on
Horizontal well is steam injection well, and lower horizontal well is producing well.
Further, in step C, upper horizontal well and lower horizontal well carry out steam soak exploitation and oil reservoir is depressurized to 3 simultaneously
To 3.5MPa.
Further, the super-viscous oil fluid behaviour in the oil reservoir block of the qualified oil reservoir is：Deaerated under reservoir temperature former
Oil viscosity is more than 50000mPas, and relative density is more than 0.98g/cm3.
Further, step F is specifically included：The temperature between steam injection well and producing well is treated more than 90 DEG C, the water of steam injection well
When 80% area above temperature of the horizontal segment of flat section and producing well reaches 150 DEG C, SAGD exploitation is transferred to, or
Person's steam injection well continuous steam injection, horizontal well is continuously produced.
Further, the step A is specially step A1：Selecting the geologic parameter of qualified oil reservoir, the qualified oil reservoir expires
It is enough to lower condition：Reservoir buried depth is 995m, and degassed crude viscosity is 53450~72340mPa.s, continuous core intersection at 50 DEG C
Equal to 15m；
The step B is specially step B1：Two paired dual horizontal wells are set in the qualified oil reservoir, described in each pair
Dual horizontal well includes：Well spacing is the upper horizontal well and lower horizontal well of 5m；
The step E is specially step E1：Work steam injection speed is 110t/d, and well head steam quality is 95%, individual well steam injection
10000t,
The step F is specially step F1：Circulation preheating 4 months, production-injection ratio is between 0.8 to 1.2.
Further, the step D also includes step D1：The upper horizontal well as monitoring well, the horizontal well on described
Under enter optical fiber temperature measurement system.
Further, by mechanical lift forced circulation, steam is not encouraged and enters oil reservoir, and heat transfer type is with heat transfer
Main, the heat transfer by heat conduction mode for only causing by the temperature difference of steam and formation temperature heats stratum；Produced Liquid is that the steam of injection is cold
But the condensed water for being formed afterwards, production-injection ratio is maintained at 1.0.
Further, the step A is specially step A2：Selecting the geologic parameter of qualified oil reservoir, the qualified oil reservoir expires
It is enough to lower condition：680 meters of reservoir buried depth, degassed crude viscosity is 147500~485400mPa.s, continuous core intersection at 50 DEG C
It is 80 meters.
Upper horizontal well machinery lifting tubing string is arranged on the inclination section of the upper horizontal well, and lower horizontal well machinery lifting tubing string sets
Put the inclination section in the lower horizontal well.
The circulation preheating method traditional relative to mid-deep strata oil reservoir, the present invention is under before circulating preheating in dual horizontal well
Mechanical lift tubing string has been entered, during preheating is circulated, height can be warmed by the mechanical lift of mechanical lift tubing string
Water lifts back production, forces steam circulation, reaches and waits the temperature difference of oil reservoir uniformly to heat, and so, just overcomes traditional circulation and preheats
Mode is difficult to the shortcoming of circulation preheating in mid-deep strata oil reservoir.
Brief description of the drawings
Fig. 1 is to force steam circulation pre-heating mean according to temperature difference such as the mid-deep strata oil reservoir dual horizontal wells of the embodiment of the present invention
Operation principle schematic diagram；
Fig. 2 is that horizontal well steam injection, oil recovery and the pipe of temperature, pressure real-time monitoring three of the embodiment of the present invention recover the oil with pit shaft
The structural representation in the main view direction of process equipment；
Fig. 3 is that horizontal well steam injection, oil recovery and the pipe of temperature, pressure real-time monitoring three of embodiments of the invention are adopted with pit shaft
The cross section structure diagram in the main view direction of the head valve system of oily process equipment；
Fig. 4 is the horizontal well steam injection in the vertical section positioned at protective casing of embodiments of the invention, oil recovery and temperature
The pipe of pressure real-time monitoring three with pit shaft DP technology equipment horizontal direction cross-sectional view；
Fig. 5 is the horizontal well steam injection in the horizontal segment positioned at protective casing of embodiments of the invention, oil recovery and temperature
The pipe of pressure real-time monitoring three with pit shaft DP technology equipment vertical direction cross-sectional view；
Fig. 6 is that horizontal well steam injection, oil recovery and the pipe of temperature, pressure real-time monitoring three of embodiments of the invention are adopted with pit shaft
The cross section structure diagram of the integral joint tubing hanger of the head valve system of oily process equipment（Side-looking direction）.
Drawing reference numeral explanation：
1st, upper horizontal well 10, horizontal segment 13, inclination section 15, upper horizontal well machinery lifting tubing string
17th, upper horizontal well steam injection tubing string
3rd, lower horizontal well 30, horizontal segment 33, inclination section 35, lower horizontal well machinery lifting tubing string
17th, lower horizontal well steam injection tubing string
106 levels are sieved in the mechanical lift tubing string of 101 protective casing, 102 steam injection tubing string 103,104 oil well pumps, 105 ends
The integral joint tubing 110 of horizontal segment 109 of the steam injection tubing string of vertical section 108 of the steam injection tubing string of screen pipe hanger 107 of well
The steam inlet of coiled tubing 202,203 casing annulus gateways, 204 polished rods, 205 polished rod sealers, 206 rubber gates, 207
Remote Hydraulic blowout preventer, the instlated tubular of 304 oil-well tubing collar of the thick flange seal main body of 208 integral joint tubing hanger 209 305
The heat-insulated inner tube of 306 heat-insulation layer 307
Specific embodiment
In order to be more clearly understood to technical characteristic of the invention, purpose and effect, now control illustrates this hair
Bright specific embodiment.
As shown in figure 1, the present invention proposes that a kind of temperature difference such as mid-deep strata oil reservoir dual horizontal well force steam circulation pre-heating mean,
The temperature difference such as mid-deep strata oil reservoir dual horizontal well pressure steam circulation pre-heating mean includes：
Step A：Qualified oil reservoir is selected, confirms to implement the present invention according to known reservoir geology parameter and super-viscous oil fluid behaviour
Feasibility；The geologic parameter of qualified oil reservoir of the invention meets following condition：Reservoir buried depth is that 600-1000m is mid-deep strata oil
Hide, continuous core intersection is more than or equal to 10m, vertical permeability and horizontal permeability ratio are more than 0.3, and the present invention is buried for oil reservoir
Depth is the mid-deep strata oil reservoir of 600-1000m, and without process of the invention, too deep oil reservoir then needs more for the preheating of shallow oil reservoir
It is complicated technique and equipment；
Step B：Dual horizontal well is set in the qualified oil reservoir, and the dual horizontal well includes：Well spacing is the upper water of 4-6m
Horizontal well 1 and lower horizontal well 3, the well depth of dual horizontal well are less than 1600 meters, and each horizontal section length of dual horizontal well is double in more than 300m
The setting of horizontal well and the parameters of dual horizontal well provide guarantee for the circulation of postorder is preheated；
Step C：Steam soak exploitation is carried out simultaneously to the well of upper level 1 and lower horizontal well 3, the qualified oil reservoir is depressurized to
Below 3.5MPa, is that follow-up circulation preheating prepares pressure and temperature condition, for example, entering under passing through for steam soak exploitation
Tubing string carries out steam soak exploitation, after qualified oil reservoir is depressurized to below 3.5MPa, then will be carried for the tubing string of steam soak exploitation
Rise out；
Step D：After qualified oil reservoir is depressurized to below 3.5MPa, in the upper horizontal well 1 of the dual horizontal well under enter on water
Horizontal well steam injection string 17 and upper horizontal well machinery lifting tubing string 15, it is deep to upper horizontal well horizontal segment under upper horizontal well steam injection tubing string 17
At the 2/3 of 10, i.e., apart from 1/3 that the end of upper horizontal well horizontal segment 10 is the upper length of horizontal well horizontal segment 10, in described pair of water
Enter lower horizontal well steam injection tubing string 37 and lower horizontal well machinery lifting tubing string 35, lower horizontal well steam injection under in the lower horizontal well 3 of horizontal well
Under tubing string 37 at the deep tiptoe to lower horizontal well horizontal segment 30；Upper horizontal well machinery lifting tubing string 15 is arranged on the upper horizontal well
Inclination section 13 or heel at, lower horizontal well machinery lifting tubing string 35 is arranged on the inclination section 33 or heel of the lower horizontal well
Place；The setting of above-mentioned parameter, it is contemplated that realize the thermal communication between horizontal well, and upper horizontal well the overall preheating of horizontal segment
The overall pre-heat effect of the horizontal segment of effect and lower horizontal well, it is ensured that the condensate liquid of each horizontal well is able to forced circulation；
Step E：Then preheating is circulated, upper horizontal well and lower horizontal well carry out continuous injection extraction, will steam simultaneously
Vapour injects simultaneously in upper horizontal well and lower horizontal well, while using mechanical lift back production condensate liquid, high-temperature steam from well head to
Behind underground, condensate liquid is condensed into, the condensate liquid in upper horizontal well is produced by upper horizontal well, the condensate liquid of lower horizontal well is by lower level
Well is produced, and steam enters to have back again in well, forms complete cycle, has reached the purpose of mid-deep strata oil reservoir circulation preheating.
By setting dual horizontal well and the setting mechanical lift tubing string in dual horizontal well, and select suitable each technique
Parameter, can realize that the temperature difference such as the pressure steam circulation of the dual horizontal well of mid-deep strata oil reservoir, realization are uniformly heated so that double levels
Oil reservoir between well has been fully warmed-up and has reached thermal communication condition.
Further, the temperature difference such as mid-deep strata oil reservoir dual horizontal well pressure steam circulation pre-heating mean also includes：Step F：
After circulation preheating 2-4 month, switch to SAGD exploitation, with steam injection well steam injection, producing well is depressured production, wherein,
Upper horizontal well is steam injection well, and lower horizontal well is producing well, allows reservoir fluid to enter into producing well, is continuously given birth to using mechanical lift
Produce, realize that gravity drainage is developed.
Further, in step C, upper horizontal well and lower horizontal well carry out steam soak exploitation and oil reservoir is depressurized to 3 simultaneously
To 3.5MPa.Because pressure drops too low and is also unfavorable for the lifting of high-temperature water or condensate liquid.
Further, the super-viscous oil fluid behaviour in the oil reservoir block of the qualified oil reservoir is：Deaerated under reservoir temperature former
Oil viscosity is more than 50000mPas, and relative density is more than 0.98g/cm3.These parameters are adapted to of the invention lifting and preheated
Journey.
Further, step F is specifically included：The reservoir temperature between steam injection well and producing well is treated more than 90 DEG C, steam injection well
Horizontal segment and the 80% area above temperature of horizontal segment of producing well when reaching 150 DEG C, so, the oil reservoir between injection-production well is
Thermal communication condition is fully warmed-up and reached, SAGD exploitation, i.e. steam injection well continuous steam injection, horizontal well is then transferred to
Continuous production.
Further, the step A is specially step A1：Selecting the geologic parameter of qualified oil reservoir, the qualified oil reservoir expires
It is enough to lower condition：Reservoir buried depth is 995m, and degassed crude viscosity is continuous core intersections of 53450~72340mPa.s etc. at 50 DEG C
In 15m；
The step B is specially step B1：Two paired dual horizontal wells are set in the qualified oil reservoir, described in each pair
Dual horizontal well includes：Well spacing is the upper horizontal well and lower horizontal well of 5m, so, can increase efficiency and yield；
The step E is specially step E1：Work steam injection speed is 110t/d, and well head steam quality is 95%, individual well steam injection
10000t, these parameters are conducive to the oil reservoir between injection-production well to be fully warmed-up and reach thermal communication condition.
The step F is specially step F1：Circulation preheating 4 months, it is possible to achieve be fully warmed-up, production-injection ratio is 0.8 to 1.2
Between, to realize continuous circulation, used as preferably selection, production-injection ratio is 1, is circulated more satisfactory.
Further, the step D also includes step D1：The upper horizontal well as monitoring well, the horizontal well on described
Under enter optical fiber temperature measurement system, for detecting downhole temperature, shown by upper horizontal well optical fiber temperature-measurement monitoring materials, lower horizontal well note
After vapour, horizontal segment temperature gradually rises, and thermal communication well section is more long, shows progressively to be connected between two mouthfuls of wells.
For example, when upper horizontal well is as monitoring well, the present invention using the horizontal well steam injection of following one embodiment, oil recovery,
And the pipe of temperature, pressure real-time monitoring three enters steam injection tubing string 102, mechanical lift pipe at present with pit shaft DP technology equipment with same
Post 103 and coiled tubing, are provided with optical fiber temperature measurement system in coiled tubing, such as including capillary and multigroup thermocouple, with reality
In present same pit shaft, steam injection, lifting, the organic assembling of thermometric in same pit shaft, can realize above three function.
Such as Fig. 2, three pipe includes with pit shaft DP technology equipment：Head valve system, steam injection tubing string 102, machinery
Lifting tubing string 103 and integral joint tubing 109.
Protective casing 101, is arranged in the pit shaft of horizontal well, and the protective casing includes：The protective casing of interconnection
Vertical section and protective casing horizontal segment；In preferably implementing one, the internal diameter of the vertical section of the protective casing 101 >=
220mm, the internal diameter >=178mm of the horizontal segment of the protective casing.
Head valve system, such as Fig. 3, are arranged at the well head of the pit shaft of horizontal well or ground, and interconnection technique sleeve pipe
101；
Steam injection tubing string 102, mechanical lift tubing string 103 and integral joint tubing 109, are separately positioned on protective casing 101
In, such as Fig. 4 and Fig. 5, steam injection tubing string 102, mechanical lift tubing string 103 and integral joint tubing 109 do not include mutually, in other words
The relation that steam injection tubing string 102, mechanical lift tubing string 103 and integral joint tubing 109 this three are not socketed, these three pipes
Any one in post or pipeline is arranged at outside other two；
The integral joint tubing 109 includes：The vertical section of the integral joint tubing of interconnection and the level of integral joint tubing
Section；The vertical section of the integral joint tubing is located in the vertical section of the protective casing, the horizontal section of the integral joint tubing
In the horizontal segment of the protective casing, before the end of the integral joint tubing post is located at the venthole of the steam injection tubing string
Portion, for protecting temperature and pressure to monitor coiled tubing；
Such as Fig. 4 and Fig. 5, the coiled tubing 110 is arranged in the integral joint tubing 109, is set in the coiled tubing
There are capillary and multigroup thermocouple, the coiled tubing includes：The vertical section of the coiled tubing of interconnection and coiled tubing
Horizontal segment, the vertical section of the coiled tubing is located in the vertical section of the integral joint tubing, the vertical section of the coiled tubing
Horizontal segment is located in the horizontal segment of the integral joint tubing, end and the basic phase in integral joint tubing end of the coiled tubing
When for filling capillary pressure measuring and thermocouple temperature measurement；The capillary test pressure should be less than 15MPa, multigroup thermoelectricity
Even test temperature should be less than 450 DEG C, and heat-resisting protective material filling is used between the coiled tubing；
The steam injection tubing string 102 includes：The vertical section 107 of the steam injection tubing string of interconnection and the water of steam injection tubing string
Flat section 108, the vertical section of the steam injection tubing string is located in the vertical section of the protective casing, the level of the steam injection tubing string
Section is located in the horizontal segment of the protective casing, and crude oil is realized in the end of the steam injection tubing string to horizontal well pit shaft injection steam
Exploitation and oil reservoir preheating；As shown in Figure 4 and Figure 5, steam injection string includes from outside to inside：Insulated exterior duct 305, heat-insulation layer 306 and
Heat-insulated inner tube 307, heat-insulation layer 306 is folded between insulated exterior duct 305 and heat-insulated inner tube 307；
The mechanical lift tubing string 103 is arranged in the vertical section of the protective casing, for lifting the liquid in pit shaft
（Crude oil）；Such as Fig. 5, mechanical lift tubing string 103 is including passing through the oil pick-up tube that oil-well tubing collar 304 is coupled together；
Such as Fig. 6, the head valve system includes：Thick flange seal main body 209, integral joint tubing hanger 208, oil pumping
Pipe exports 201 and steam inlet 202（Such as Fig. 3）, steam inlet 202 is arranged in thick flange seal main body 209.
The integral joint tubing 109 and coiled tubing 110 are suspended on the integral joint tubing hanger 208, the machine
Tool lifting tubing string 103 connects the oil pick-up tube outlet 201, and the steam injection tubing string 102 connects the steam inlet 202.As schemed
6, integral joint tubing hanger 208 is arranged in thick flange seal main body 209, has signal to connect in integral joint tubing hanger 208
Receipts system, temperature and pressure data are converted to by the signal received in coiled tubing 110.Additionally, such as Fig. 3, the well-head valve
Door system also includes：Casing annulus gateway 203, polished rod 204, polished rod sealer 205, rubber gate 206, Remote Hydraulic shut-in well
Device 207.
The present invention is of the invention with existing well head at well head in addition to being provided with three tubing strings or pipeline simultaneously in the wellbore
Equipment has significant difference.One of main distinction is：The present invention at well head, i.e., head valve system simultaneously the company of being provided with
The part of three tubing strings or pipeline is connect or hangs, mechanical lift tubing string connects the oil pick-up tube outlet 201, steam injection tubing string 102
The steam inlet 202 is connected, integral joint tubing 109 and coiled tubing 110 are suspended on the integral joint tubing hanger 208.
It may also be said that steam injection tubing string and mechanical lift tubing string are all hung directly from thick flange seal main body 209, it is original well head
Boll-weevil hanger, this point and prior art are identicals, but in addition, the present invention is also in thick flange seal main body 209
Integral joint tubing hanger 208 is hung, for fixing and connecting coiled tubing 110.
In order to ensure in the confined space of head valve system can be while connect or hang three tubing strings or pipeline, this
Invention in addition to opening up steam inlet 202, is also the setting of integral joint tubing hanger 208 in thick flange seal main body 209
Leave space so that the two does not influence, non-interference, and integral joint tubing hanger 208 is arranged on the side of steam inlet 202
To from Fig. 3, integral joint tubing hanger 208 is arranged on the rear of steam inlet 202.
The present invention realizes steam injection in same pit shaft, oil recovery, monitoring so that steam injection, oils recovery, monitoring can be in same pit shaft
Carry out simultaneously, and prior art be only handle up the steam injection that carries out of exploitation and monitoring, it is necessary to proposed after steam injection terminates steam injection and
Monitoring tubing string, under enter flow string after can just carry out oil producing operation.
Further, such as Fig. 2, three pipe also includes with pit shaft DP technology equipment：Oil well pump 104, is connected to described
The lower bottom of mechanical lift tubing string 103, for extracting the crude oil adulterated in steam condensate (SC) and steam condensate (SC) in horizontal well.
The piston of the oil well pump is connected with sucker rod using sucker rod on-off connector.The oil well pump depth of setting L meets：
L≥H-100(P-1)
Wherein, H is oil reservoir vertical depth, and P is strata pressure.
Further, such as Fig. 2, three pipe also includes with pit shaft DP technology equipment：The screen pipe hanger of horizontal well
106, it is arranged in the protective casing, in the screen casing of suspension horizontal well horizontal segment, end sieve 105 is located at the end of screen casing, uses
In the horizontal segment injection steam to the protective casing.
Further, such as Fig. 5, the steam injection tubing string maximum outside diameter, mechanical lift tubing string and integral joint tubing are maximum outer
Footpath sum than the vertical section of the protective casing internal diameter to when young 10mm, to ensure that three tubing strings or pipeline can be arranged on skill
In art sleeve pipe.Further, the internal diameter >=220mm of the vertical component of the protective casing, to ensure three tubing strings or pipeline all
Can be arranged in protective casing.
Further, the internal diameter of the integral joint tubing should be at least above 40mm, and the internal diameter of the coiled tubing should be at least
Less than 38mm, so that integral joint tubing accommodates coiled tubing.
Further, the internal diameter >=220mm of the vertical component of the protective casing, the maximum of the mechanical lift tubing string is outer
Footpath >=70mm, in such manner, it is possible to reduce the outside dimension of mechanical lift tubing string, increases the space of other two tubing strings or pipeline, enters
One step ground, the maximum outside diameter of the oil well pump body and oil well pump box cupling≤92mm, distributed with obtaining rational space.It is described
Internal diameter >=the 62mm of mechanical lift tubing string, to ensure lifting efficiency.Further, the internal diameter >=40mm of the steam injection tubing string,
To ensure steam injection quality.
Further, the external diameter of the box cupling of the steam injection tubing string and the maximum outside diameter sum of integral joint tubing are than the skill
The internal diameter of the horizontal segment of art sleeve pipe to when young 10mm, to enable that steam injection tubing string is arranged in the horizontal segment of protective casing.
As preferably selecting, the internal diameter >=40mm of the steam injection tubing string 102, external diameter≤89mm；The steam injection pipe
The external diameter of the box cupling of post 102 than the horizontal segment of the protective casing internal diameter to when young 10mm, it is preferred that the steam injection tubing string
Box cupling external diameter >=108mm, the box cupling using two-way chamfering connect.
It is preferred that external diameter >=the 70mm of the mechanical lift tubing string 103, internal diameter >=62mm；The steam injection tubing string 102
The internal diameter of the vertical component of the maximum outside diameter sum than the protective casing 101 of maximum outside diameter and the post of mechanical lift pipe 103 is at least
Small 10mm, the box cupling of mechanical lift tubing string 103 is about 89mm.
Further, by mechanical lift forced circulation, steam is not encouraged and enters oil reservoir, and heat transfer type is with heat transfer
It is main, only by steam and stratum（Or oil reservoir）The heat transfer by heat conduction mode that the temperature difference of temperature causes heats stratum；Produced Liquid is injection
Steam cooling after the condensed water that is formed, production-injection ratio is maintained at 1.0.
Further, the step A is specially step A2：Selecting the geologic parameter of qualified oil reservoir, the qualified oil reservoir expires
It is enough to lower condition：680 meters of reservoir buried depth, degassed crude viscosity is 147500~485400mPa.s, continuous core intersection at 50 DEG C
It is 80 meters.
The several instantiations of description in greater detail below：
Example 1：One sandstone group oil reservoir of certain oil reservoir, as sandstone group oil reservoir, 955 meters of buried depth, degassed crude glues at 50 DEG C
It is 53450~72340mPa.s to spend, and core intersection is 15 meters, and deployment 2 is paired within straight well steam soak latter stage, oil reservoir region
Horizontal well well group, including 2 mouthfuls of horizontal steam injection wells, 2 mouthfuls of horizontal production wells, 1 mouthful of flat observation well of horizontal saliva, horizontal well direction and construction line base
This keeping parallelism, upper and lower horizontal inter-well distance is 5 meters.For the geologic feature and oil property of the oil reservoir, double levels are carried out
The circulation prefiring of Jing Jing pairs.
Oil reservoir average thickness is more than 15 meters, and porosity, permeability, vertical permeability is more than with horizontal direction permeability ratio
0.3, it is adapted to the exploitation of SAGD technologies；
Undeveloped reserves, hole pattern is dual horizontal well group, 5 meters of upper and lower horizontal well spacing；
Enter steam injection string, lifting tubing string and lifting equipment down respectively in upper and lower horizontal well pit shaft, while in upper horizontal well
Under enter optical fiber temperature measurement system, level monitoring section temperature change；
Wet saturated steam is injected in steam injection string, using lifting equipment back production, forces the steam circulation, steam injection speed to be
110t/d, well head steam quality is 95%, individual well steam injection 10000t, circulation preheating 4 months, and production-injection ratio is 1.0.
Upper horizontal well optical fiber temperature-measurement monitoring materials show, after lower horizontal well steam injection, upper horizontal well horizontal segment temperature gradually rises
Height, thermal communication well section 260m accounts for the 58% of aggregate level section, shows progressively to be connected between two mouthfuls of wells.
Example 2：Certain oil field Guantao group oil reservoir is super dense oil reservoir in middle and deep layer oil reservoir, 680 meters of buried depth, degassed crude viscosity at 50 DEG C
It is 147500~485400mPa.s, core intersection is 80 meters.Before making the present invention, the oil reservoir uses dual horizontal well combination,
Its production course is divided into two stages of preheating of handling up and handle up, and in the stage of handling up, lower horizontal well was handled up for four cycles, upper horizontal well
After operation, well group is handled up preheating two cycles.Cycle oil production and gas oil ratio are declining, and recovery percent of reserves is 18%.
For the geologic feature and oil property of the oil reservoir, the present invention implements the circulation preheating of upper and lower horizontal well.
（1）Oil reservoir average thickness is more than 15 meters, porosity, permeability, vertical permeability and horizontal direction permeability ratio
More than 0.3, it is adapted to the exploitation of SAGD technologies；
（2）Oil reservoir is developed, hole pattern is combined for dual horizontal well, 4 meters of upper and lower horizontal well spacing；
（3）Enter steam injection string, lifting tubing string and lifting equipment down in upper and lower horizontal well pit shaft；
（4）Wet saturated steam is injected in steam injection string, using lifting equipment back production, steam circulation is forced, work steam injection
Speed is 110t/d, and well head steam quality is 95%, individual well steam injection 10000t, circulation preheating 4 months, and production-injection ratio is 1.0.
The well group such as passes through at the temperature difference circulation preheating makes 2/3 horizontal segment not up to uniformly employed uniformly be employed, all
Horizontal segment temperature reaches 150 DEG C.And after being transferred to SAGD exploitations, achieve preferable effect.Upper horizontal well metaideophone, day steam injection
180 tons, lower horizontal well uses Φ 120mm pump opening well and making productions, well group 184 tons of liquid of daily output, day 40.3 tons of oil-producing, aqueous 78.2%, wink
When gas oil ratio 0.19, instantaneous production-injection ratio 0.87.43164 tons of SAGD stages steam injection, the stage produces 48858 tons of liquid, stage oil-producing 7042
Ton, stage gas oil ratio 0.16, stage production-injection ratio 1.13, average day oil-producing 32.8t/d, more than the average day oil-producing of preheating of preceding handling up
Amount.
The present invention can solve super dense oil reservoir in middle and deep layer reservoir horizontal well and employ uneven, pipeline start up by preheating caused by reservoir
Difficult problem, important promotion is played to the utilization ratio for improving SAGD initial stage horizontal segments and the oil-producing speed for accelerating SAGD.
Schematical specific embodiment of the invention is the foregoing is only, the scope of the present invention is not limited to.For this
Each part of invention can be mutually combined under conditions of not conflicting, any those skilled in the art, not depart from this
Done equivalent variations and modification, all should belong to the scope of protection of the invention on the premise of the design of invention and principle.
Claims (8)
1. a kind of temperature difference such as mid-deep strata oil reservoir dual horizontal well forces steam circulation pre-heating mean, it is characterised in that the mid-deep strata
The temperature difference such as oil reservoir dual horizontal well pressure steam circulation pre-heating mean includes：
Step A：The geologic parameter of qualified oil reservoir, the qualified oil reservoir is selected to meet following condition：Reservoir buried depth is 600-
1000m, continuous core intersection is more than or equal to 10m, and vertical permeability and horizontal permeability ratio are more than 0.3；
Step B：Dual horizontal well is set in the qualified oil reservoir, and the dual horizontal well includes：Well spacing is the upper horizontal well of 4-6m
With lower horizontal well, less than 1600 meters, the horizontal section length of double levels is in more than 300m for the well depth of dual horizontal well；
Step C：Steam soak exploitation is carried out simultaneously to upper horizontal well and lower horizontal well, the qualified oil reservoir is depressurized to 3.5MPa
Below；
Step D：Then, in the upper horizontal well of the dual horizontal well under enter on horizontal well steam injection tubing string and upper horizontal well machinery lift
Tubing string is risen, it is deep at the 2/3 of upper horizontal well horizontal segment under upper horizontal well steam injection tubing string, in the lower horizontal well of the dual horizontal well
Under enter lower horizontal well steam injection tubing string and lower horizontal well machinery lifting tubing string, lower horizontal well level is arrived under lower horizontal well steam injection tubing string deeply
At the tiptoe of section；
Step E：Then circulation preheating, upper horizontal well and lower horizontal well carry out continuous injection extraction simultaneously, by steam in Shang Shui
Injected simultaneously in horizontal well and lower horizontal well, while using mechanical lift back production condensate liquid, the condensate liquid in upper horizontal well is by upper water
Horizontal well is produced, and the condensate liquid of lower horizontal well is produced by lower horizontal well；
By mechanical lift forced circulation, steam is not encouraged and enters oil reservoir, heat transfer type based on heat transfer, only by steam with ground
The heat transfer by heat conduction mode that the temperature difference of layer temperature causes heats stratum；Produced Liquid is the condensation of formation after the steam cooling injected
Water, production-injection ratio is maintained at 1.0；
The upper horizontal well enters optical fiber temperature measurement system on described as monitoring well under horizontal well；
The temperature difference such as the mid-deep strata oil reservoir dual horizontal well force steam circulation pre-heating mean to be set with pit shaft DP technology using three pipes
Standby, three pipe includes with pit shaft DP technology equipment：Head valve system, steam injection tubing string, mechanical lift tubing string, Yi Jiwu
Collar oil line, three pipe also includes with pit shaft DP technology equipment：Oil well pump, is connected to the bottom of the mechanical lift tubing string
End, for extracting the crude oil adulterated in steam condensate (SC) and steam condensate (SC) in horizontal well.
2. the temperature difference such as mid-deep strata oil reservoir dual horizontal well as claimed in claim 1 forces steam circulation pre-heating mean, and its feature exists
In the temperature difference such as mid-deep strata oil reservoir dual horizontal well pressure steam circulation pre-heating mean also includes：Step F：In circulation preheating 2 to 4
After month, switch to SAGD exploitation, steam injection well steam injection, producing well step-down is produced, wherein, upper horizontal well is steam injection
Well, lower horizontal well is producing well.
3. the temperature difference such as mid-deep strata oil reservoir dual horizontal well as claimed in claim 1 forces steam circulation pre-heating mean, and its feature exists
In simultaneously in step C, upper horizontal well and lower horizontal well carry out steam soak exploitation and oil reservoir is depressurized to 3 to 3.5MPa.
4. the temperature difference such as mid-deep strata oil reservoir dual horizontal well as claimed in claim 1 forces steam circulation pre-heating mean, and its feature exists
In the super-viscous oil fluid behaviour in the oil reservoir block of the qualified oil reservoir is：Degassed crude viscosity is more than under reservoir temperature
50000mPas, relative density is more than 0.98g/cm3.
5. the temperature difference such as mid-deep strata oil reservoir dual horizontal well as claimed in claim 2 forces steam circulation pre-heating mean, and its feature exists
In step F is specifically included：Temperature between steam injection well and producing well is treated more than 90 DEG C, the horizontal segment of steam injection well and producing well
When 80% area above temperature of horizontal segment reaches 150 DEG C, SAGD exploitation is transferred to.
6. the temperature difference such as mid-deep strata oil reservoir dual horizontal well as claimed in claim 2 forces steam circulation pre-heating mean, and its feature exists
In,
The step A is specially step A1：The geologic parameter of qualified oil reservoir, the qualified oil reservoir is selected to meet following condition：Oil
Tibetan buried depth is 995m, and degassed crude viscosity is 53450~72340mPa.s at 50 DEG C, and continuous core intersection is equal to 15m；
The step B is specially step B1：Two paired dual horizontal wells, double water described in each pair are set in the qualified oil reservoir
Horizontal well includes：Well spacing is the upper horizontal well and lower horizontal well of 5m；
The step E is specially step E1：Work steam injection speed is 110t/d, and well head steam quality is 95%, individual well steam injection 10000t.
7. the temperature difference such as mid-deep strata oil reservoir dual horizontal well as claimed in claim 1 forces steam circulation pre-heating mean, and its feature exists
In,
The step A is specially step A2：The geologic parameter of qualified oil reservoir, the qualified oil reservoir is selected to meet following condition：Oil
680 meters of buried depth is hidden, degassed crude viscosity is 147500~485400mPa.s at 50 DEG C, continuous core intersection is 80 meters.
8. the temperature difference such as mid-deep strata oil reservoir dual horizontal well as claimed in claim 1 forces steam circulation pre-heating mean, and its feature exists
In upper horizontal well machinery lifting tubing string is arranged on the inclination section of the upper horizontal well, and lower horizontal well machinery lifting tubing string is arranged on
The inclination section of the lower horizontal well.
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| CA2931882C (en) * | 2013-11-28 | 2018-03-13 | Petrochina Company Limited | Method for forced steam cycle preheating dual horizontal well in middle-deep layer reservoir under a constant temperature difference |
| CN105587302B (en) * | 2014-11-06 | 2018-12-25 | 中国石油天然气股份有限公司 | The pressure break oil reservoir connected oil wells technique of manifold and the application manifold |
| CN104500012A (en) * | 2014-11-24 | 2015-04-08 | 中国石油天然气股份有限公司 | SAGD starting method for interlayer heterogeneous thickened oil pool |
| CN105756625A (en) * | 2014-12-17 | 2016-07-13 | 中国石油天然气股份有限公司 | Oil production method adopting double horizontal wells |
| CN105756642A (en) * | 2014-12-17 | 2016-07-13 | 中国石油天然气股份有限公司 | SAGD (steam assisted gravity drainage) well group provided with double horizontal wells |
| CN105756641A (en) * | 2014-12-17 | 2016-07-13 | 中国石油天然气股份有限公司 | Method for judging communication of double horizontal wells during circulating preheating of SAGD (steam assisted gravity drainage) |
| CN105756644B (en) * | 2014-12-17 | 2018-09-04 | 中国石油天然气股份有限公司 | Pre-heating mean before dual horizontal well oil recovery and dual horizontal well oil production method |
| CN105756643B (en) * | 2014-12-17 | 2019-10-11 | 中国石油天然气股份有限公司 | A kind of SAGD horizontal well system and its starting method |
| CN105298446A (en) * | 2014-12-28 | 2016-02-03 | 新疆科力新技术发展有限公司 | Shallow-layer oil sand in-situ exploitation process applying equipment |
| CN105986794A (en) * | 2015-03-05 | 2016-10-05 | 中国石油天然气股份有限公司 | Oil extraction method for steam assisted gravity drainage (SAGD) dual horizontal well and tubular column equipment of oil extraction method |
| CN104989353A (en) * | 2015-07-16 | 2015-10-21 | 国勘石油技术有限公司 | Oil production method for SAGD dual horizontal wells |
| CN106368661A (en) * | 2015-07-20 | 2017-02-01 | 中国石油天然气股份有限公司 | Method for determining time point for shifting from steam huff and puff to steam drive |
| CN106368660A (en) * | 2015-07-20 | 2017-02-01 | 中国石油天然气股份有限公司 | Method for oil exploitation |
| CN106761558A (en) * | 2016-12-20 | 2017-05-31 | 中国石油天然气股份有限公司 | Electrical heating auxiliary dual horizontal well circulation preheating tubular column structure and its oil reservoir heating means |
| CN109138976B (en) * | 2018-07-23 | 2022-01-04 | 中国石油天然气股份有限公司 | Method for judging time for converting double-horizontal-well preheating into SAGD (steam assisted gravity drainage) and double-horizontal-well preheating device |
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| BRPI0800928A2 (en) * | 2008-04-02 | 2009-11-17 | Petroleo Brasileiro Sa | method for induced oil production in wells through horizontal fractures |
| CN201843600U (en) * | 2010-11-16 | 2011-05-25 | 中国石油天然气股份有限公司 | SAGD (Steam Assisted Gravity Drainage) mechanical lifting circulating preheating equipment |
| CN102900415B (en) * | 2012-09-25 | 2014-12-24 | 中国石油天然气股份有限公司 | Method for mining deep and ultra-deep thick oil pools by using double horizontal well fire flooding drainage |
| CN103174403B (en) * | 2013-03-08 | 2016-08-10 | 中国石油天然气股份有限公司 | Thick-layer drives unitized production method containing the gravity every interlayer common heavy oil reservoir with steam |
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