CN105756641A - Method for judging communication of double horizontal wells during circulating preheating of SAGD (steam assisted gravity drainage) - Google Patents
Method for judging communication of double horizontal wells during circulating preheating of SAGD (steam assisted gravity drainage) Download PDFInfo
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- CN105756641A CN105756641A CN201410788781.5A CN201410788781A CN105756641A CN 105756641 A CN105756641 A CN 105756641A CN 201410788781 A CN201410788781 A CN 201410788781A CN 105756641 A CN105756641 A CN 105756641A
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Abstract
The invention provides a method for judging communication of double horizontal wells during circulating preheating of SAGD (steam assisted gravity drainage). The double horizontal wells comprise a steam injection well and a production well. The judgment method comprises communication judgment and communication degree judgment, wherein the communication judgment comprises the following steps: the steam injection rate of the production well is reduced gradually or a choke of the production well is enlarged gradually under the condition that the steam injection rate and the inner diameter of the choke of the steam injection keep unchanged; whether pressure linage occurs between the production well and the steam injection well is judged, if pressure linage occurs, the production well and the steam injection well are communicated, and if pressure linage does not occur, the production well and the steam injection well are not communicated. The technical scheme can solve the problem that the communication of a well group cannot be judged in a circulating preheating stage of the SAGD technology in the prior art.
Description
Technical field
The present invention relates to Techniques for super heavy oil recovery field, circulate the determination methods of pre-thermal communication in particular to a kind of dual horizontal well SAGD.
Background technology
SAGD is the abbreviation of steam (steam), assisted (auxiliary), gravity (gravity) and drainage (draining).
Circulation preheating: horizontal well steam injected cycle simultaneously up and down, heats near wellbore oil reservoir by high-temperature steam, gradually builds up upper and lower horizontal well heating power, hydraulic communication.
Connection judges: adopt certain ways and means analysis to judge upper and lower horizontal well waterpower, thermal communication feature, is divided into connective judgement and connecting degree to be judged as that turning the SAGD production time determines offer foundation.
SAGD is the technology being abroad uniquely commercially used for super heavy oil recovery.Dual horizontal well SAGD technique adopts parallel double horizontal well hole pattern, and upper horizontal well is steam injection well, and lower horizontal well is producing well.In production process, horizontal well continuous steam injection, lower horizontal well recover the oil continuously.
Dual horizontal well SAGD technique is divided into circulation warm-up phase and recovers the oil the production phase.At circulation warm-up phase, steam injection well and producing well steam injected cycle simultaneously, in the short period of time, it is achieved oil reservoir uniformly heats, make formation heating power, hydraulic communication between steam injection well and producing well, when Connectivity Section reaches after to a certain degree, proceed to the production phase of recovering the oil.In the production phase of recovering the oil, high-quality steam is injected from steam injection well, contact with cold oil district, release vaporization latent heat crude oil, heated viscosity of crude reduces, flow downward under gravity together with steam condensate (SC), flow into producing well, extraction from producing well along the Connectivity Section between steam injection well and producing well.Crude oil can by extraction from produce, must assure that there is Connectivity Section between steam injection well and producing well, therefore before proceeding to the oil recovery production phase, connectedness between upper and lower horizontal well must be judged, only when on go into the well between Connectivity Section reach after to a certain degree, recover the oil the production phase could obtain economic benefit.
Owing to external SAGD oil reservoir homogeneity is good, circulation warm-up phase can uniformly heat oil reservoir, domestic SAGD Reservoir Heterogeneity is strong, circulation warm-up phase is difficult to uniformly heat oil reservoir, therefore there is technologic difference in SAGD exploitation both at home and abroad, the external determination methods circulating pre-thermal communication also without clear and definite dual horizontal well SAGD simultaneously, the SAGD that so there is no directly use for reference circulates the determination methods of pre-thermal communication.
Summary of the invention
Present invention is primarily targeted at and a kind of dual horizontal well SAGD determination methods circulating pre-thermal communication is provided, judge the connective problem that cannot judge of well group at circulation warm-up phase solving SAGD technology in prior art.
To achieve these goals, the invention provides a kind of dual horizontal well SAGD and circulate the determination methods of pre-thermal communication, dual horizontal well includes steam injection well and producing well, determination methods includes: connectedness judges that step and connecting degree judge step, connectedness judges that step includes: when the steam injection speed and oil nozzle internal diameter that keep steam injection well are constant, the steam injection speed making producing well is gradually lowered, or makes the oil nozzle of producing well expand gradually；Judge whether pressure linkage occurs between producing well and steam injection well, if there is pressure linkage, it is determined that producing well connects with steam injection well, if occurring without pressure linkage, it is determined that producing well does not connect with steam injection well.
Further, judge between producing well and steam injection well, whether occur that pressure linkage includes: obtain the bottom pressure in producing well and the bottom pressure in steam injection well, when the bottom pressure in steam injection well is gradually lowered along with the bottom pressure in producing well, it is determined that producing well connects with steam injection well；Or the casing pressure in acquisition producing well and the casing pressure in steam injection well, when the casing pressure in steam injection well is gradually lowered along with the casing pressure in producing well, it is determined that producing well connects with steam injection well；Or the gas injection pressure in acquisition producing well and the gas injection pressure in steam injection well, when the gas injection pressure in steam injection well is gradually lowered along with the gas injection pressure in producing well, it is determined that producing well connects with steam injection well；Or the discharge opeing pressure in acquisition producing well and the discharge opeing pressure in steam injection well, when the discharge opeing pressure in steam injection well is gradually lowered along with the discharge opeing pressure in producing well, it is determined that producing well connects with steam injection well.
Further, it is judged that whether occur in the process of pressure linkage between producing well and steam injection well, keep the pressure reduction between bottom pressure and the bottom pressure of steam injection well in producing well less than 0.3MPa.
Further, when the steam injection speed making producing well is gradually lowered, it is judged that whether occur in the process of pressure linkage between producing well and steam injection well, the steam injection speed of producing well is made to be gradually lowered until being 0.
Further, whether, when the steam injection speed making producing well is gradually lowered, it is judged that occur in the process of pressure linkage between producing well and steam injection well, the oil nozzle internal diameter of producing well remains unchanged.
Further, whether, when the oil nozzle making producing well expands gradually, it is judged that occur in the process of pressure linkage between producing well and steam injection well, the steam injection speed of producing well remains unchanged.
Further, when determining that carrying out connecting degree after producing well connects with steam injection well judges that step, connecting degree judge that step includes: producing well is carried out closing well operation；The temperature of the multiple points for measuring temperature in acquisition producing well；If the temperature of point for measuring temperature rises after falling before or this point for measuring temperature higher than the temperature of the point for measuring temperature adjacent with this point for measuring temperature time, it is determined that the corresponding point of this point for measuring temperature place and steam injection well are interconnected, and determine connecting degree according to the connectedness of all of point for measuring temperature.
Further, also included before connectedness judges step: control the operation pressure of producing well and steam injection well lower than oil reservoir fracture pressure；Make between steam injection well and producing well pressure reduction less than 0.3MPa.
Application technical scheme, connective judgement is carried out at the SAGD warm-up phase produced, connectedness judges that step includes: when the steam injection speed and oil nozzle internal diameter that keep steam injection well are constant, the steam injection speed making described producing well is gradually lowered, or makes the oil nozzle of described producing well expand gradually.Judge whether pressure linkage occurs between producing well and steam injection well, if there is pressure linkage, it is determined that producing well connects with steam injection well, if occurring without pressure linkage, it is determined that producing well does not connect with steam injection well.The problem that the method for the application present invention can solve at the SAGD warm-up phase produced, the connectedness of well group cannot be judged in prior art.
Accompanying drawing explanation
The Figure of description constituting the part of the application is used for providing a further understanding of the present invention, and the schematic description and description of the present invention is used for explaining the present invention, is not intended that inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 illustrates the structural representation of dual horizontal well in the determination methods of the horizontal well SAGD circulation preheating connecting degree according to the present invention；
Fig. 2 illustrates the schematic diagram that during determination methods adopting embodiments of the invention one, steam injection well and the linkage of producing well casing pressure decline；
Fig. 3 illustrates the schematic diagram that during determination methods adopting embodiments of the invention two, steam injection well and the linkage of producing well bottom pressure decline；And
Fig. 4 illustrates in the determination methods of embodiments of the invention one schematic diagram of downhole temperature change after the stewing well of producing well.
Wherein, above-mentioned accompanying drawing includes the following drawings labelling:
10, steam injection well；20, producing well.
Detailed description of the invention
It should be noted that when not conflicting, the embodiment in the application and the feature in embodiment can be mutually combined.Describe the present invention below with reference to the accompanying drawings and in conjunction with the embodiments in detail.
As it is shown in figure 1, the dual horizontal well in embodiment one includes steam injection well 10 and producing well 20.The determination methods of the SAGD pre-thermal communication of circulation includes connectedness and judges that step and connecting degree judge step.Wherein, connectedness judges that step includes: the steam injection speed of steam injection well 10 remains unchanged, and makes the steam injection speed of producing well 20 be gradually lowered.Judge whether pressure linkage occurs between producing well 20 and steam injection well 10, if there is pressure linkage, it is determined that producing well 20 connects with steam injection well 10, if occurring without pressure linkage, it is determined that producing well 20 does not connect with steam injection well 10.
The steam injection well 10 of the SAGD dual horizontal well in the application and producing well 20 all include steam injection pipe and return liquid pipe.Above-mentioned steam injection speed is the speed of the steam injection pipe steam injection to steam injection well 10 and producing well 20.
The operation that is embodied as of the present embodiment is: keep the steam injection speed of steam injection well 10 to remain unchanged, and steam injection well 10 loop parameter is constant.Being gradually lowered producing well 20 steam injection speed, steam injection rate reduction principle is lower 20t/ days every time, observes the bottom pressure linkage variation tendency of two wells.
As in figure 2 it is shown, vertical coordinate is steam injection speed in figure, unit is t/ days, and abscissa is the time, and interval is 1 hour.Dark post in figure represents the steam injection speed of steam injection well 10, and light color post represents the steam injection speed of producing well 20, and data collection intervals is 1 hour.There is shown gas injection well 10 steam injection speed to remain unchanged, for 80t/ days.The steam injection speed making producing well 20 is gradually lowered, and often reduces 20t/ days every other hour.As can be observed from Figure, after reducing the steam injection speed of producing well 20, the bottom pressure of producing well 20 is gradually reduced, along with producing well 20 bottom pressure, the bottom pressure of steam injection well 10 occurs that linkage declines, and can illustrate to exist between producing well 20 and steam injection well 10 connection with this.It should be noted that this experiment is only obtain bottom pressure.Certainly, obtain casing pressure, gas injection pressure or discharge opeing pressure, and observe whether they occur that linkage can also judge whether connection.
In above-mentioned experimental implementation, it should be noted that following item: after steam injection speed is lowered, steam injection well 10 and producing well 20 bottom hole pressure difference must not exceed 0.3MPa, and observing time is 3 hours, until producing well 20 steam injection speed reduces to 0.If period pressure reduction is more than 0.3MPa, then the steam injection amount suitably raising producing well 20 ensures that steam injection well 10 and producing well 20 bottom hole pressure difference are between 0.3MPa.Ensure during test that the internal diameter of the production fluid end oil nozzle of two wells is constant simultaneously.
If in during test, there is the downward trend that links in steam injection well 10 bottom pressure, then illustrate that this well group exists connection sign, meet and carry out the condition that connecting degree judges to test further.
If in during test, linkage downward trend all do not occur in steam injection well 10 casing pressure or steam injection pressure, then well 20 steam injection amount of resuming production, eliminate pressure reduction, again carry out connection test after 15 days, whether connect between checking well.
The technical scheme of application the present embodiment, carries out connective judgement at the SAGD warm-up phase produced, and connectedness judges that step includes: makes the steam injection speed of producing well 20 be gradually lowered, makes the steam injection speed of steam injection well 10 remain unchanged.Judge whether pressure linkage occurs between producing well 20 and steam injection well 10, if there is pressure linkage, it is determined that producing well 20 connects with steam injection well 10, if occurring without pressure linkage, it is determined that producing well 20 does not connect with steam injection well 10.The problem that should can solve with the aforedescribed process at the SAGD warm-up phase produced, the connectedness of well group cannot be judged in prior art.
Dual horizontal well in embodiment two also includes steam injection well 10 and producing well 20.The determination methods of the SAGD pre-thermal communication of circulation includes connectedness and judges that step and connecting degree judge step.Wherein, connectedness judges that step includes: the oil nozzle internal diameter of steam injection well 10 remains unchanged, and makes the oil nozzle internal diameter of producing well 20 expand gradually.Judge whether pressure linkage occurs between producing well 20 and steam injection well 10, if there is pressure linkage, it is determined that producing well 20 connects with steam injection well 10, if occurring without pressure linkage, it is determined that producing well 20 does not connect with steam injection well 10.
The steam injection well 10 of the SAGD dual horizontal well in the application and producing well 20 all include steam injection pipe and return liquid pipe.What above-mentioned oil nozzle was positioned at steam injection well 10 and producing well 20 returns liquid pipe ground surface end place, and connects with returning liquid pipe.
The operation that is embodied as of the present embodiment is ensure that steam injection well 10 oil nozzle is constant, and producing well 20 progressively expands production fluid end oil nozzle, and oil nozzle expands principle for expand 2mm every time, observes the casing pressure linkage variation tendency of two wells.
As it is shown on figure 3, vertical coordinate represents oil nozzle internal diameter, unit is millimeter, and abscissa is the time, and interval is 1 hour.In figure, dark post represents the internal diameter of steam injection well 10 oil nozzle, and light color post represents the internal diameter of producing well 20 oil nozzle, and data acquisition intervals is 1 hour.The oil nozzle of gas injection well 10 remains unchanged, for 16mm.The oil nozzle making producing well 20 expands gradually, often expands 2mm every other hour.As can be observed from Figure, after expanding production well 20 exports oil nozzle, the casing pressure of producing well is gradually reduced, along with the decline of producing well 20 casing pressure, the casing pressure of steam injection well 10 occurs that linkage declines.Illustrate to exist between producing well 20 and steam injection well 10 connection with this.It should be noted that this experiment is only obtain casing pressure.Certainly, obtain bottom pressure, gas injection pressure or discharge opeing pressure, and observe whether they occur that linkage can also judge whether connection.
In above-mentioned experiment, it should be noted that following item: every time after expanding production well 20 oil nozzle, steam injection well 10 and producing well 20 bottom hole pressure difference cannot be greater than 0.3MPa, and observing time is 60 minutes.Ensureing during test that the steam injection amount fluctuating margin of two wells is less than ± 10%, between two wells, pressure reduction is not more than 0.3MPa.Duration of test runs must not exceed 6 hours.
If in during test, there is the downward trend that links in steam injection well 10 casing pressure or fluid pressure, then illustrate that this well group exists connection sign, meet and carry out the condition that connecting degree judges to test further.
If in during test, linkage downward trend all do not occur in steam injection well 10 casing pressure or fluid pressure, then recover producing well oil nozzle, eliminate pressure reduction, continue cycling through, again carry out connection test after 15 days, whether connect between checking well.
The technical scheme of application the present embodiment, carries out connective judgement at the SAGD warm-up phase produced, and connectedness judges that step includes: makes the oil nozzle internal diameter of producing well 20 expand gradually, makes the oil nozzle internal diameter of steam injection well 10 remain unchanged.Judge whether pressure linkage occurs between producing well 20 and steam injection well 10, if there is pressure linkage, it is determined that producing well 20 connects with steam injection well 10, if occurring without pressure linkage, it is determined that producing well 20 does not connect with steam injection well 10.The problem that should can solve with the aforedescribed process at the SAGD warm-up phase produced, the connectedness of well group cannot be judged in prior art.
The determination methods of the dual horizontal well SAGD pre-thermal communication of circulation of the application includes connective judgement and connecting degree judges two parts, generally first judges connectedness, determining on the basis possessing certain connectedness, determines whether connecting degree.It is to say, the determination methods of embodiment one and embodiment two is respectively provided with connecting degree judges step.Their connecting degree judges that step can be identical, it is also possible to differ.Judge that step is introduced for the connecting degree of embodiment one below.
Connecting degree judgment experiment is directed to the well group having determined that connectedness, and connection judges whether to determine whether connection position and length, confirms whether well group meets and turns SAGD working condition.This process is usually and then connective to be judged, generally adopts static well warming therapy.Boil in a covered pot over a slow fire well, monitoring producing well 20 downhole temperature and Liquid output change by producing well 20 and judge connection position.
Having application pressure reduction water conservancy diversion method to carry out connecting degree judgement in prior art, rely on process fluid flow to carry out relevant parameter change and judge, the indices of display is obtain under dynamic condition.But, owing to bottom hole temperature (BHT) change is had interference by flow process, in order to obtain further judgement, it is necessary to grasp some static nature data.Therefore, the connecting degree of the application judges to use static well warming therapy, changes producing well 20 or injection-production well into closing well state simultaneously, analyzes connective and connection position by producing well 20 downhole temperature downward trend.
The concrete operation method that connecting degree judges is as follows:
1, steam injection well 10 steam injection or circulation, producing well 20 boils in a covered pot over a slow fire well, and test period is one day.
2, choose some points for measuring temperature at producing well 20, have chosen 12 points for measuring temperature in the present embodiment.As it is shown in figure 1, in producing well 20 from left to right respectively point for measuring temperature 1 to point for measuring temperature 12.The present embodiment is only with reference to the temperature value of point for measuring temperature 3 to 12.
3, observe producing well 20 downhole temperature variation tendency, if some temperature in down-hole rises after falling before, show this some connection；When certain some temperature is apparently higher than adjoint point temperature, this some connection.
As shown in Figure 4, certain SAGD well group carrying out connecting degree judgement, upper horizontal well steam injection, lower horizontal well boils in a covered pot over a slow fire well.The 3rd of point for measuring temperature, 4,5,6,7,8,9,10,11 totally 9 place's temperature occur falling before rear lofted features, it was shown that connection between the 3,4,5,6,7,8,9,10, about 11 corresponding horizontal segment of the horizontal segment of twin-well group, the 12nd does not connect.Connecting degree is the connection length in measuring section.Generally, when point for measuring temperature 3 all connects with 4 places, then it is assumed that be also connection between 2.It it is all thus connection between presumption 3 to 11.
After connecting degree judges test, producing well 20 recovered to the cycle stage.By regulating steam injection well 10 steam injection amount and oil nozzle control bottom pressure lower than oil reservoir fracture pressure 0.5Mpa in process of the test, if horizontal segment peak constant temperature rises to saturated-steam temperature corresponding to bottom pressure or metering Liquid output when not going out in test, stop test, recover production system to test.
Circulate in the determination methods of pre-thermal communication at the dual horizontal well SAGD of the application, when carrying out operations it should be noted that following pressure requirements:
1, the operation pressure of described producing well 20 and described steam injection well 10 is controlled lower than oil reservoir fracture pressure, in case major structure becomes oil reservoir break accident to occur.
2, control between described steam injection well 10 and described producing well 20 that pressure reduction is less than 0.3MPa, to ensure the stability between steam injection well 10 and producing well 20.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.All within the spirit and principles in the present invention, any amendment of making, equivalent replacement, improvement etc., should be included within protection scope of the present invention.
Claims (8)
1. the determination methods of the dual horizontal well SAGD pre-thermal communication of circulation, it is characterized in that, described dual horizontal well includes steam injection well (10) and producing well (20), described determination methods includes: connectedness judges that step and connecting degree judge step, and described connectedness judges that step includes:
When the steam injection speed and oil nozzle internal diameter that keep described steam injection well (10) are constant, make the steam injection speed of described producing well (20) be gradually lowered, or make the oil nozzle of described producing well (20) expand gradually；
Judge whether pressure linkage occurs between described producing well (20) and described steam injection well (10), if there is described pressure linkage, then determine that described producing well (20) connects with described steam injection well (10), if occurring without described pressure linkage, it is determined that described producing well (20) does not connect with described steam injection well (10).
2. determination methods according to claim 1, it is characterised in that judge whether occur that described pressure linkage includes between described producing well (20) and described steam injection well (10):
Obtain the bottom pressure in described producing well (20) and the bottom pressure in described steam injection well (10), when the bottom pressure in described steam injection well (10) is gradually lowered along with the bottom pressure in described producing well (20), it is determined that described producing well (20) connects with described steam injection well (10)；Or
Obtain the casing pressure in described producing well (20) and the casing pressure in described steam injection well (10), when the casing pressure in described steam injection well (10) is gradually lowered along with the casing pressure in described producing well (20), it is determined that described producing well (20) connects with described steam injection well (10)；Or
Obtain the gas injection pressure in described producing well (20) and the gas injection pressure in described steam injection well (10), when the gas injection pressure in described steam injection well (10) is gradually lowered along with the gas injection pressure in described producing well (20), it is determined that described producing well (20) connects with described steam injection well (10)；Or
Obtain the discharge opeing pressure in described producing well (20) and the discharge opeing pressure in described steam injection well (10), when the discharge opeing pressure in described steam injection well (10) is gradually lowered along with the discharge opeing pressure in described producing well (20), it is determined that described producing well (20) connects with described steam injection well (10).
3. determination methods according to claim 1, it is characterized in that, judge whether to occur between described producing well (20) and described steam injection well (10), in the process of described pressure linkage, to keep the bottom pressure in described producing well (20) and the pressure reduction between the bottom pressure in described steam injection well (10) less than 0.3MPa.
4. determination methods according to claim 1, it is characterized in that, when the steam injection speed making described producing well (20) is gradually lowered, judge whether to occur between described producing well (20) and described steam injection well (10), in the process of described pressure linkage, to make the steam injection speed of described producing well (20) be gradually lowered until being 0.
5. determination methods according to claim 1, it is characterized in that, when the steam injection speed making described producing well (20) is gradually lowered, judge whether to occur between described producing well (20) and described steam injection well (10) that in the process of described pressure linkage, the oil nozzle internal diameter of described producing well (20) remains unchanged.
6. determination methods according to claim 1, it is characterized in that, when the oil nozzle making described producing well (20) expands gradually, judge whether to occur between described producing well (20) and described steam injection well (10) that in the process of described pressure linkage, the steam injection speed of described producing well (20) remains unchanged.
7. determination methods according to claim 1, it is characterised in that when determining that carrying out described connecting degree after described producing well (20) connects with described steam injection well (10) judges step, described connecting degree judges that step includes:
Producing well (20) is carried out closing well operation；
Obtain the temperature of multiple points for measuring temperature in described producing well (20)；
If the temperature of described point for measuring temperature rises after falling before or this point for measuring temperature higher than the temperature of the point for measuring temperature adjacent with this point for measuring temperature time, determine that the corresponding point of this point for measuring temperature place and described steam injection well (10) are interconnected, determine connecting degree according to the connectedness of all of point for measuring temperature.
8. determination methods according to claim 1, it is characterised in that also included before described connectedness judges step:
Control the operation pressure of described producing well (20) and described steam injection well (10) lower than oil reservoir fracture pressure；
Make between described steam injection well (10) and described producing well (20) pressure reduction less than 0.3MPa.
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| CN109138976A (en) * | 2018-07-23 | 2019-01-04 | 中国石油天然气股份有限公司 | Dual horizontal well preheats the judgment method and dual horizontal well preheating device for turning SAGD opportunity |
| CN112302596A (en) * | 2019-08-02 | 2021-02-02 | 中国石油天然气股份有限公司 | Injection-production control method for SAGD high-temperature electric submersible pump well group |
| CN112901127A (en) * | 2019-11-20 | 2021-06-04 | 中国石油天然气股份有限公司 | Multi-branch SAGD reservoir expansion oil extraction method for super heavy oil reservoir |
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| 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 |
| CN112302596A (en) * | 2019-08-02 | 2021-02-02 | 中国石油天然气股份有限公司 | Injection-production control method for SAGD high-temperature electric submersible pump well group |
| CN112901127A (en) * | 2019-11-20 | 2021-06-04 | 中国石油天然气股份有限公司 | Multi-branch SAGD reservoir expansion oil extraction method for super heavy oil reservoir |
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Application publication date: 20160713 |
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