CN104500012A - SAGD starting method for interlayer heterogeneous thickened oil pool - Google Patents
SAGD starting method for interlayer heterogeneous thickened oil pool Download PDFInfo
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- CN104500012A CN104500012A CN201410679993.XA CN201410679993A CN104500012A CN 104500012 A CN104500012 A CN 104500012A CN 201410679993 A CN201410679993 A CN 201410679993A CN 104500012 A CN104500012 A CN 104500012A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
- E21B43/2406—Steam assisted gravity drainage [SAGD]
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
- E21B43/2406—Steam assisted gravity drainage [SAGD]
- E21B43/2408—SAGD in combination with other methods
Abstract
The invention provides an SAGD starting method for an interlayer heterogeneous thickened oil pool. According to the interlayer heterogeneous thickened oil pool in the method, an interlayer exists between horizontal segments of an injection well and a production well, the spreading range of the interlayer along the horizontal segments does not exceed half length of the horizontal segments, and the thickness of the interlayer ranges from 0.3 m to 3 m. The method specifically comprises the steps that steam injection equipressure cycle preheating is carried out on the steam injection well and the production well; according to the different positions of the interlayer between the injection well and the production well, the different modes are adopted to carry out steam injection of the steam injection well and cycle preheating of the production well; according to the different positions of the interlayer between the injection well and the production well, the different modes are adopted to carry out alternative injection and production; a long pipe and a short pipe of the steam injection well carry out pure steam injection at the same time, a long pipe and a short pipe of the production well drain liquid at the same time, then, the step is converted into the SAGD production stage, and the SAGD starting method for the interlayer heterogeneous thickened oil pool is completed. According to the method, uniform development of a steam cavity of the SAGD horizontal segments can be achieved, and the oil production and the recovery efficiency are effectively improved.
Description
Technical field
This law invention relates to the exploitation method of the heavy crude reservoir in a kind of oil field, particularly relates to the starting method that the heterogeneous body heavy crude reservoir that there is interlayer between a kind of injection-production well adopts steam assisted gravity drainage techniques exploitation, belongs to field of petroleum exploitation.
Background technology
Steam assisted gravity drainage techniques (is called for short: SAGD) invented by Canadian Bulter in 1978, obtained successful Application at the heavy crude reservoir on the ground such as Liaohe Oil Field, Xinjiang Oilfield of Canadian oil-sand mining area, China.
SAGD disposes horizontal well pair stacked up and down at same oil reservoir, high-quality steam is injected in the steam injection well of top, density due to steam is far smaller than crude oil and upwards onlap forms vapor chamber in the earth formation, along with the continuous injection of steam, vapor chamber constantly upwards and sideways expansion, with the crude oil generation interchange of heat in oil reservoir.Reduced by the viscosity of crude heated, flow downward under gravity with condensed water, extraction from the horizontal production well of oil reservoir bottom.So far, scale development is achieved in the heavy crude reservoir on the SAGD technology ground such as the Liaohe River, Xinjiang at home.
Pertinent literature is pointed out (seat Changfeng, horse Desheng etc., " research of dual horizontal well super-viscous oil SAGD cyclic preheat starting guide ", Southwest Petrol University's journal (natural science edition), 2010,32 (4)), SAGD exploitation is divided into two stages: the startup stage of SAGD and the SAGD production phase.
Before carrying out SAGD production, thermal cycle startup must be carried out to injection-production well.Start steam to inject producing well and steam injection well to exploit this stage be called startup stage or warm-up phase to starting to transfer to SAGD.The target of warm-up phase is within the shortest time, realizes the homogeneous heating of oil reservoir, steam injection well is communicated with producing well homogeneous heating, sets up drain path between steam injection well and producing well.
Current SAGD starts handle up pipeline start up by preheating and steam injected cycle pipeline start up by preheating two kinds of methods usually.Wherein, handling up, pipeline start up by preheating injection pressure is high, temperature is high, easily causes damage to completion interval of well body structure.Steam injected cycle pipeline start up by preheating homogeneous heating, start steadily, be generally divided into three steps: steam circulates in Liang Koujing, reservoir carrys out transferring heat mainly through heat transfer; Form pressure reduction between well between two wells, steam injection well pressure, higher than producing well, makes crude oil between well flow toward producing well, prepares for proceeding to SAGD production completely; Top steamed well annular space stops discharge opeing, and bottom producing well stops steam injection, proceeds to the SAGD production phase completely.
Due to the Liaohe River, the heavy crude reservoir depositional environment on the ground such as Xinjiang all belongs to fluvial facies deposit, reservoir heterogeneity is strong, river course edge lateral accretion interbed is grown, especially between injection-production well, the existence of interlayer has material impact to drain path between SAGD injection-production well, the position that interlayer is grown between injection-production well, adopt above-mentioned cyclic preheat starting method, the position having continuous interlayer to grow between injection-production well is difficult to set up drain path, thus be difficult to grow vapor chamber at this position, the vapor chamber on horizontal segment is caused evenly to expand, and the extend sizes of vapor chamber and uniformity coefficient, proportional with oil well output.Oil Field practice shows, for the SAGD exploitation that there is interlayer between injection-production well, regular circulation preheating starting method has badly influenced the growth of horizontal segment vapor chamber and SAGD well yield and recovery ratio.
Summary of the invention
In order to solve the problem, the heavy crude reservoir that the object of the invention is to for there is interlayer between SAGD injection-production well horizontal segment provides a kind of cyclic preheat starting method, realize steam and break through interlayer between injection-production well, grow position at interlayer and set up drain path, promote the object that vapor chamber is evenly grown along injection-production well horizontal segment.
In order to achieve the above object, the invention provides a kind of interlayer heterogeneous body heavy crude reservoir SAGD starting method, the method comprises the following steps:
Described interlayer heterogeneous body heavy crude reservoir be there is interlayer between injection-production well horizontal segment and interlayer along horizontal segment spread scope be no more than injection-production well horizontal section length 1/2, thickness of interlayer is the interlayer heterogeneous body heavy crude reservoir of 0.3-3 rice;
Step one: steam injection well and producing well carry out the isobaric cyclic preheat of steam injection; Wherein, preheating time is 60-90 days, and preheating method is long tube steam injection, short tube discharge opeing;
Step 2: according to the diverse location of interlayer between injection-production well, carries out steam injection well steam injection, producing well cyclic preheat in different ways, wherein, carries out steam injection well steam injection, the time of producing well cyclic preheat is 50-100 days:
When between injection-production well, interlayer is positioned at injection-production well horizontal segment heel and neighbouring (distance heel 1-3 rice) thereof, the mode steam injection that steam injection well adopts short tube steam injection, long tube stops note, producing well adopts long tube steam injection, the mode of short tube discharge opeing carries out cyclic preheat;
When between injection-production well, interlayer is positioned at injection-production well horizontal segment middle and neighbouring (distance heel 1-3 rice), the mode steam injection of steam injection while of steam injection well employing short tube and long tube, producing well adopts long tube steam injection, the mode of short tube discharge opeing carries out cyclic preheat;
When between injection-production well, interlayer is positioned at injection-production well horizontal segment tiptoe and neighbouring (distance heel 1-3 rice) thereof, the mode steam injection that steam injection well adopts long tube steam injection, short tube stops note, producing well adopts short tube steam injection, the mode of long tube discharge opeing carries out cyclic preheat;
Step 3: according to the diverse location of interlayer between injection-production well, carry out alternately rotation note in different ways and adopt:
When between injection-production well interlayer be positioned at injection-production well horizontal segment heel and neighbouring time, adopt steam injection well short tube and producing well short tube to replace rotation and note the mode of adopting, specifically comprise the following steps:
A, steam injection well short tube note 3-10 hour, long tube stop note, and producing well stops cyclic preheat, and steam injection well stopped note after 1-2 hour, producing well short tube discharge opeing 3-10 hour;
B, steam injection well stop discharge opeing, producing well short tube steam injection 3-10 hour, and producing well stopped note after 1-2 hour, steam injection well short tube discharge opeing 3-10 hour;
C, repetitive cycling carry out step a and step b 10-15 time;
When between injection-production well, interlayer is positioned in the middle of injection-production well horizontal segment and time neighbouring, adopts steam injection well length pipe and producing well length pipe to replace rotation and notes the mode of adopting, specifically comprise the following steps:
A, steam injection well length pipe are with note 3-10 hour, and producing well stops cyclic preheat, and steam injection well stopped note after 1-2 hour, producing well length pipe discharge opeing simultaneously 3-10 hour;
B, steam injection well stop discharge opeing, and producing well length pipe is with note 3-10 hour, and producing well stopped note after 1-2 hour, steam injection well length pipe discharge opeing simultaneously 3-10 hour;
C, repetitive cycling carry out step a and step b 10-15 time;
When between injection-production well interlayer be positioned at injection-production well horizontal segment tiptoe and neighbouring time, adopt steam injection well long tube and producing well long tube to replace rotation and note the mode of adopting, specifically comprise the following steps:
A, steam injection well long tube note 3-10 hour, short tube stop note, and producing well stops cyclic preheat, and steam injection well stopped note after 1-2 hour, producing well long tube discharge opeing 3-10 hour;
B, steam injection well stop discharge opeing, producing well long tube note 3-10 hour, and producing well stopped note after 1-2 hour, steam injection well long tube discharge opeing 3-10 hour;
C, repetitive cycling carry out step a and step b 10-15 time;
Step 4: pure steam noted by steam injection well length pipe simultaneously, the discharge opeing simultaneously of producing well length pipe, proceeds to the SAGD production phase, completes described interlayer heterogeneous body heavy crude reservoir SAGD starting method.
In interlayer heterogeneous body heavy crude reservoir SAGD starting method provided by the invention, preferably, in step one, the flowing bottomhole pressure (FBHP) of steam injection well is equal with producing well flowing bottomhole pressure (FBHP), all than initial reservoir pressure height 0.2-0.4Mpa.
In interlayer heterogeneous body heavy crude reservoir SAGD starting method provided by the invention, preferably, in step one, the injection rate of steam injection well and producing well steam is 100-200m
3/ day, the drain age velocity of steam injection well and producing well is 100-200m
3/ day, described steam is 80-100% in the steam quality of steam injection well and producing well well head.
In interlayer heterogeneous body heavy crude reservoir SAGD starting method provided by the invention, preferably, in step 2 and step 3, when the lithology of described interlayer be clay mineral or mud stone time, in steam injection well and producing well, inject pure steam;
When the lithology of described interlayer be tight sand or carbonate rock (limestone, dolomite) time, in steam, add concentration is inject steam injection well and producing well after the acid solution of 20-28wt%; Require when injecting steam injection well and producing well after adding acid solution in steam that the steam quality of well head is 80-100% too
In interlayer heterogeneous body heavy crude reservoir SAGD starting method provided by the invention, preferably, the acid solution of employing comprises hydrochloric acid, formic acid, acetic acid, chloroacetic acid, hydrofluoric acid or mud acid etc.; More preferably, in the mud acid of employing, the content of hydrofluoric acid is 3wt%-5wt%, and the content of hydrochloric acid is 12wt%-15wt%.
According to the specific embodiment of the present invention, when interlayer lithology be tight sand or carbonate rock (limestone, dolomite) time, the object of adding acid solution in steam accelerates interlayer corrosion and breakthrough.
In interlayer heterogeneous body heavy crude reservoir SAGD starting method provided by the invention, preferably, in step 2, the flowing bottomhole pressure (FBHP) of producing well discharge opeing is lower than initial reservoir pressure 0.0-0.3MPa.
In interlayer heterogeneous body heavy crude reservoir SAGD starting method provided by the invention, preferably, in step 2, the steam injection rate of steam injection well is 100-200m
3/ day, described steam is 80-100% in the steam quality of steam injection well well head; The steam injection rate of producing well cyclic preheat is 100-200m
3/ day, described steam is 80-100% in the steam quality of producing well well head, and the drain age velocity of producing well cyclic preheat is 100-200m
3/ day.
In interlayer heterogeneous body heavy crude reservoir SAGD starting method provided by the invention, preferably, in step 3, the steam injection pressure of steam injection well and producing well all exceedes oil reservoir fracture pressure 0.3-0.5MPa, and flowing bottomhole pressure (FBHP) when steam injection well and producing well discharge opeing is all lower than initial reservoir pressure 0.0-0.3MPa.
According to the specific embodiment of the present invention, the steam injecting pure steam and injection in steam injection well and producing well is added with concentration when being the acid solution of 20-28wt%, all requires that the steam injection pressure of steam injection well and producing well exceedes oil reservoir fracture pressure 0.3-0.5MPa.
In interlayer heterogeneous body heavy crude reservoir SAGD starting method provided by the invention, preferably, in step 3, the injection rate of steam injection well and producing well (inject pure steam or steam adds the speed that concentration is the acid solution of 20-28wt%) is 200-300m
3/ day, the drain age velocity of steam injection well and producing well is 200-300m
3/ day, described steam is 80-100% in the steam quality of steam injection well and producing well well head.
There is the heterogeneous body heavy crude reservoir SAGD starting method of interlayer between injection-production well horizontal segment provided by the present invention, idiographic flow schematic diagram as shown in Figure 1, has following technique effect:
1, compared with existing SAGD pipeline start up by preheating mode, isobaric cyclic preheat is adopted in SAGD starting method provided by the present invention, without pressure reduction between injection-production well, effectively prevent the early stage steam of preheating break through oil reservoir between injection-production well too early due to the existence of pressure reduction and alter from High Permeability Interval into problem, be conducive to homogeneous heating.
2, the present invention has taken into full account the impact of existence on drain path of interlayer between injection-production well horizontal segment, according to the position of interlayer, proposes a set of injection-production well tubular column structure combination and method of operating, possesses exploitativeness, simple to operate.Be specially, be positioned at the situation near horizontal segment heel for interlayer between injection-production well, steam injection well employing short tube note, long tube stop note, the mode cyclic preheat of producing well long tube steam injection, short tube discharge opeing; Interlayer between injection-production well is positioned to the situation in horizontal segment centre position, steam injection well adopts short tube and long tube to note simultaneously, the mode cyclic preheat of producing well long tube steam injection short tube discharge opeing; Interlayer between injection-production well is positioned to the situation of horizontal segment tiptoe position, steam injection well employing long tube note, short tube stop note, and producing well adopts the mode cyclic preheat of short tube steam injection, long tube discharge opeing.This mode, according to different interlayer position, takes different steam injection point and producing well drainage point flexible combination, carries out steam injection and discharge opeing at the correspondence position of interlayer, makes to inject the point-to-point hasty breaching interlayer of steam-energy.Producing well adopts cyclic preheat simultaneously, ensure that the uniformity of producing well horizontal segment well cylinder pressure, realizes the even preheating of producing well horizontal segment.
3, the present invention takes different injected medias according to the lithology difference of interlayer.Be specially, when interlayer lithology is clay mineral (mud stone), inject pure steam; When interlayer lithology be tight sand or carbonate rock (limestone, dolomite) time, in steam, add the acid solution that concentration is 20-28wt%, under the washing away of acid solution, interlayer rock fast decoupled, can accelerate interlayer corrosion and breakthrough.
4, on above-mentioned measure basis, the present invention proposes the injection-production well setting up drain path fast for the horizontal segment region of growing at interlayer and replace rotation note mining method.A SAGD well on, by a bite well single-point surpass fracture pressure fast concentrate steam injection, impel and produce microcrack in this position interlayer; In steam injection process, another mouthful of well closing well, can realize building the pressure, avoid injected media along Thief zone section alter into; Realize injected media by stewing well after steam injection to advance by leaps and bounds further and corrosion in microcrack, then pass through another mouthful of well at the quick centralized discharge of this place's single-point, rate of flow of fluid in microcrack can be accelerated; And adopt by replacing rotation note, then inject fluid well-distributing corrosion interlayer rock between can realizing at the bottom of interlayer top, the pressure break realizing interlayer makes the quick corrosion of seam, thus sets up drain path fast in interlayer position.
5, the method for the present invention's proposition, the oil reservoir that can realize growing between injection-production well interlayer evenly grows vapor chamber in the SAGD production phase along horizontal segment, realizes the object improving output and recovery ratio.
Accompanying drawing explanation
Fig. 1 is the heavy crude reservoir SAGD Booting sequence schematic diagram that there is interlayer between injection-production well horizontal segment provided by the invention;
Fig. 2 is that steam injection well short tube in embodiment 1 and producing well short tube replace rotation and note and adopt schematic flow sheet;
Fig. 3 is that steam injection well length pipe in embodiment 2 and producing well length pipe replace rotation and note and adopt schematic flow sheet;
Fig. 4 is that steam injection well long tube in embodiment 3 and producing well long tube replace rotation and note and adopt schematic flow sheet;
Fig. 5 is steam injection well note, producing well cyclic preheat schematic diagram in the step 2 of embodiment 1;
Fig. 6 is steam injection well note, producing well cyclic preheat schematic diagram in the step 2 of embodiment 2;
Fig. 7 is steam injection well note, producing well cyclic preheat schematic diagram in the step 2 of embodiment 3.
Main Reference label declaration:
1 short tube 2 injected media 3 steam injection well 4 long tube 5 interlayer 6 producing well
Detailed description of the invention
In order to there be understanding clearly to technical characteristic of the present invention, object and beneficial effect, existing following detailed description is carried out to technical scheme of the present invention, but can not be interpreted as to of the present invention can the restriction of practical range.
Embodiment 1
Present embodiments provide a kind of interlayer heterogeneous body heavy crude reservoir SAGD starting method, there is interlayer 5 (as shown in Figure 5) in heel 100 meters of of the injection-production well horizontal segment right apart from this dual horizontal well SAGD well, and interlayer 5 along horizontal segment spread scope be 1/2 horizontal section length (horizontal segment length 300 meters), the thickness of interlayer 5 is 0.3 meter, the lithology of interlayer 5 is mud stone.Distance between injection-production well horizontal segment is 5 meters, enters parallel double tube all down in injection-production well pit shaft, and enter horizontal segment tiptoe under long (oil) pipe, enter horizontal segment heel under short (oil) pipe, the method specifically comprises the following steps:
Step one: steam injection well 3 and the isobaric cyclic preheat of producing well 6 steam injection 60 days;
Wherein, preheating method is long tube 4 steam injection, short tube 1 discharge opeing; The flowing bottomhole pressure (FBHP) of steam injection well 3 is equal with producing well 6 flowing bottomhole pressure (FBHP), and all than initial reservoir pressure height 0.2MPa, the speed injecting steam is 100m
3/ day, well head steam quality is 80%, and drain age velocity is 100m
3/ day, isobaric circulation;
Step 2: adopt steam injection well 3 short tube 1 note, long tube 4 stops the mode steam injection noted 50 days, the mode cyclic preheat of producing well 6 long tube 4 steam injection, short tube 1 discharge opeing 50 days, as shown in Figure 5;
Wherein, injected media 2 adopts pure steam; The injection rate of steam injection well 3 short tube 1 is 100m
3/ day, well head steam quality is 80%; The injection rate of producing well 6 cyclic preheat is 100m
3/ day, well head steam quality is 80%, and the drain age velocity of producing well 6 cyclic preheat is 100m
3/ day, the flowing bottomhole pressure (FBHP) of producing well 6 discharge opeing is equal with initial reservoir pressure;
Step 3: adopt steam injection well 3 short tube 1 and producing well 6 short tube 1 to replace rotation and note and adopt, schematic flow sheet as shown in Figure 2, specifically carries out according to following steps:
Steam injection well 3 adopts short tube 1 note 3 hours, and long tube 4 stops note, and producing well 6 stops cyclic preheat, and steam injection well 3 stops note latter 1 hour, producing well 6 short tube 1 discharge opeing 3 hours;
Steam injection well 3 stops discharge opeing, producing well 6 short tube 1 note 3 hours, and producing well 6 stops note latter 1 hour, steam injection well 3 short tube 1 discharge opeing 3 hours; So 10 times repeatedly;
Wherein, the injection rate of steam injection well 3 and producing well 6 short tube 1 is 200m
3/ day, well head steam quality is 80%, and steam injection pressure exceedes this oil reservoir fracture pressure 0.3MPa, and the drain age velocity of steam injection well 3 and producing well 6 short tube 1 is 200m
3/ day, flowing bottomhole pressure (FBHP) during discharge opeing is equal with initial reservoir pressure;
Step 4: pure steam noted by steam injection well 3 length pipe simultaneously, the discharge opeing simultaneously of producing well 6 length pipe, proceeds to the SAGD production phase, completes above-mentioned interlayer heterogeneous body heavy crude reservoir SAGD starting method.
The present embodiment turn SAGD produce after vapor chamber monitoring show, with the adjacent S AGD well of regular circulation pre-heating mean to compared with, after adopting the method for the present embodiment, vapor chamber reaches 95% in (adjacent S AGD well to be 47%) along injection-production well horizontal segment scale of growing, and production rate reaches 80 tons/day (adjacent S AGD well is to being 32 tons/day).As can be seen here, SAGD starting method provided by the invention, achieves the even growth of whole injection-production well horizontal segment vapor chamber and improves recovery ratio.
Embodiment 2
Present embodiments provide a kind of interlayer heterogeneous body heavy crude reservoir SAGD starting method, there is interlayer (as shown in Figure 6) in the middle part of the injection-production well horizontal segment that this dual horizontal well SAGD well is right, and interlayer along horizontal segment spread scope be 1/3 horizontal section length (horizontal segment length 300 meters), thickness of interlayer is 1 meter, the lithology of interlayer is tight sand.Distance between injection-production well horizontal segment is 5 meters, enters parallel double tube all down in injection-production well pit shaft, and enter horizontal segment tiptoe under long (oil) pipe, enter horizontal segment heel under short (oil) pipe, the method specifically comprises the following steps:
Step one: the isobaric cyclic preheat of steam injection well and producing well steam injection 75 days;
Wherein, preheating method is long tube steam injection, short tube discharge opeing; The flowing bottomhole pressure (FBHP) of steam injection well is equal with producing well flowing bottomhole pressure (FBHP), and all than initial reservoir pressure height 0.3MPa, injection vapor (steam) velocity is 150m
3/ day, well head steam quality is 90%, and drain age velocity is 150m
3/ day;
Step 2: the mode steam injection adopting steam injection well to adopt short tube and long tube simultaneously to note 75 days, the mode cyclic preheat of producing well employing long tube steam injection, short tube discharge opeing 75 days, as shown in Figure 6;
Wherein, injected media is in steam, add the hydrochloric acid that concentration is 20wt%, accelerates interlayer corrosion and breakthrough; Steam injection well length pipe is 150m with the injection rate of note
3/ day, well head steam quality is 90%, and producing well cyclic preheat injection rate is 150m
3/ day, well head steam quality is 90%, and drain age velocity is 150m
3/ day, the flowing bottomhole pressure (FBHP) of producing well discharge opeing is lower than initial reservoir pressure 0.15MPa;
Step 3: adopt steam injection well length pipe and producing well length pipe to replace rotation and note and adopt, schematic flow sheet as shown in Figure 3, specifically carries out according to following steps:
Steam injection well adopts length pipe with note 6 hours, and producing well stops cyclic preheat, and steam injection well stops note latter 1.5 hours, the discharge opeing simultaneously of producing well well length pipe, drain time 6 hours;
Steam injection well stops discharge opeing, and producing well length pipe was with note 6 hours, and producing well stops note latter 1.5 hours, the discharge opeing simultaneously of steam injection well length pipe, drain time 6 hours; So 13 times repeatedly;
Wherein, injected media is in steam, add the hydrochloric acid that concentration is 20wt%, and steam injection well and producing well length pipe are 250m with the injection rate noted
3/ day, well head steam quality is 90%, and steam injection pressure exceedes this oil reservoir fracture pressure 0.4MPa, and the drain age velocity of steam injection well and producing well length pipe is 250m
3/ day, flowing bottomhole pressure (FBHP) during discharge opeing is lower than initial reservoir pressure 0.15MPa;
Step 4: pure steam noted by steam injection well length pipe simultaneously, the discharge opeing simultaneously of producing well length pipe, proceeds to the SAGD production phase, completes above-mentioned interlayer heterogeneous body heavy crude reservoir SAGD starting method.
The present embodiment turn SAGD produce after vapor chamber monitoring show, with the adjacent S AGD well of regular circulation pre-heating mean to compared with, after adopting the method for the present embodiment, vapor chamber reaches 93% in (adjacent S AGD well to be 54%) along injection-production well horizontal segment scale of growing, and production rate reaches 70 tons/day (adjacent S AGD well is to being 39 tons/day).As can be seen here, SAGD starting method provided by the invention, achieves the even growth of whole injection-production well horizontal segment vapor chamber and improves recovery ratio.
Embodiment 3
Present embodiments provide a kind of interlayer heterogeneous body heavy crude reservoir SAGD starting method, there is interlayer (as shown in Figure 7) in tiptoe 100 meters of of the injection-production well horizontal segment right apart from this dual horizontal well SAGD well, and interlayer along horizontal segment spread scope be 1/2 horizontal section length (horizontal segment length 500 meters), the thickness of interlayer is 3 meters, interlayer lithology is carbonate rock.Distance between injection-production well horizontal segment is 5 meters, enters parallel double tube all down in injection-production well pit shaft, and enter horizontal segment tiptoe under long (oil) pipe, enter horizontal segment heel under short (oil) pipe, the method specifically comprises the following steps:
Step one: the isobaric cyclic preheat of steam injection well and producing well steam injection 90 days;
Wherein, preheating method is long tube steam injection, short tube discharge opeing; The flowing bottomhole pressure (FBHP) of steam injection well is equal with producing well flowing bottomhole pressure (FBHP), and all than initial reservoir pressure height 0.4MPa, injection vapor (steam) velocity is 200m
3/ day, well head steam quality is 100%, and drain age velocity is 200m
3/ day;
Step 2: adopt steam injection well long tube note, short tube stops the mode steam injection noted 100 days, producing well adopts the mode cyclic preheat 100 days of short tube steam injection, long tube discharge opeing, as shown in Figure 7;
Wherein, injected media is in steam, add the formic acid that concentration is 28wt%, accelerates interlayer corrosion and breakthrough; The injection rate of steam injection well long tube is 200m
3/ day, well head steam quality is 100%, and the injection rate of producing well cyclic preheat is 200m
3/ day, well head steam quality is 100%, and drain age velocity is 200m
3/ day, the flowing bottomhole pressure (FBHP) of producing well discharge opeing is lower than initial reservoir pressure 0.3MPa;
Step 3: adopt steam injection well long tube and producing well long tube to replace rotation and note and adopt, schematic flow sheet as shown in Figure 4, specifically carries out according to following steps:
Steam injection well adopts long tube note 10 hours, and short tube stops note, and producing well stops cyclic preheat, and steam injection well stops note latter 2 hours, the discharge opeing of producing well long tube, drain time 10 hours;
Steam injection well stops discharge opeing, producing well long tube note 10 hours, and producing well stops note latter 2 hours, the discharge opeing of steam injection well long tube, drain time 10 hours; So 15 times repeatedly;
Wherein, injected media is in steam, add the formic acid that concentration is 28wt%, and the injection rate of steam injection well and producing well long tube is 300m
3/ day, well head steam quality is 100%, and steam injection pressure exceedes this oil reservoir fracture pressure 0.5MPa, and the drain age velocity of steam injection well and producing well long tube is 300m
3/ day, flowing bottomhole pressure (FBHP) during discharge opeing is lower than initial reservoir pressure 0.3MPa;
Step 4: pure steam noted by steam injection well length pipe simultaneously, the discharge opeing simultaneously of producing well length pipe, proceeds to the SAGD production phase, completes above-mentioned interlayer heterogeneous body heavy crude reservoir SAGD starting method.
The present embodiment turn SAGD produce after vapor chamber monitoring show, with the adjacent S AGD well of regular circulation pre-heating mean to compared with, after adopting the method for the present embodiment, vapor chamber reaches 92% in (adjacent S AGD well to be 41%) along injection-production well horizontal segment scale of growing, and production rate reaches 120 tons/day (adjacent S AGD well is to being 45 tons/day).As can be seen here, SAGD starting method provided by the invention, achieves the even growth of whole injection-production well horizontal segment vapor chamber and improves recovery ratio.
Claims (10)
1. an interlayer heterogeneous body heavy crude reservoir SAGD starting method, the method comprises the following steps:
Described interlayer heterogeneous body heavy crude reservoir be there is interlayer between injection-production well horizontal segment and interlayer along horizontal segment spread scope be no more than injection-production well horizontal section length 1/2, thickness of interlayer is the interlayer heterogeneous body heavy crude reservoir of 0.3-3 rice;
Step one: steam injection well and producing well carry out the isobaric cyclic preheat of steam injection; Wherein, preheating time is 60-90 days, and preheating method is long tube steam injection, short tube discharge opeing;
Step 2: according to the diverse location of interlayer between injection-production well, carries out steam injection well steam injection, producing well cyclic preheat in different ways, wherein, carries out steam injection well steam injection, the time of producing well cyclic preheat is 50-100 days:
When between injection-production well, interlayer is positioned at injection-production well horizontal segment heel, the mode steam injection that steam injection well adopts short tube note, long tube stops note, producing well adopts long tube steam injection, the mode of short tube discharge opeing carries out cyclic preheat;
When between injection-production well, interlayer is positioned in the middle of injection-production well horizontal segment, the mode steam injection of steam injection while of steam injection well short tube and long tube, producing well adopts long tube steam injection, the mode of short tube discharge opeing carries out cyclic preheat;
The mode steam injection that when interlayer is positioned at injection-production well horizontal segment tiptoe when between injection-production well, steam injection well adopts long tube steam injection, short tube stops note, producing well adopts short tube steam injection, the mode of long tube discharge opeing carries out cyclic preheat;
Step 3: according to the diverse location of interlayer between injection-production well, carry out alternately rotation note in different ways and adopt:
When interlayer is positioned at injection-production well horizontal segment heel when between injection-production well, adopts steam injection well short tube and producing well short tube to replace rotation and note the mode of adopting, specifically comprise the following steps:
A, steam injection well short tube note 3-10 hour, long tube stop note, and producing well stops cyclic preheat, and steam injection well stopped note after 1-2 hour, producing well short tube discharge opeing 3-10 hour;
B, steam injection well stop discharge opeing, producing well short tube steam injection 3-10 hour, and producing well stopped note after 1-2 hour, steam injection well short tube discharge opeing 3-10 hour;
C, repetitive cycling carry out step a and step b 10-15 time;
When interlayer is positioned in the middle of injection-production well horizontal segment when between injection-production well, adopts steam injection well length pipe and producing well length pipe to replace rotation and note the mode of adopting, specifically comprise the following steps:
A, steam injection well length pipe are with note 3-10 hour, and producing well stops cyclic preheat, and steam injection well stopped note after 1-2 hour, producing well length pipe discharge opeing simultaneously 3-10 hour;
B, steam injection well stop discharge opeing, and producing well length pipe is with note 3-10 hour, and producing well stopped note after 1-2 hour, steam injection well length pipe discharge opeing simultaneously 3-10 hour;
C, repetitive cycling carry out step a and step b 10-15 time;
When interlayer is positioned at injection-production well horizontal segment tiptoe when between injection-production well, adopts steam injection well long tube and producing well long tube to replace rotation and note the mode of adopting, specifically comprise the following steps:
A, steam injection well long tube note 3-10 hour, short tube stop note, and producing well stops cyclic preheat, and steam injection well stopped note after 1-2 hour, producing well long tube discharge opeing 3-10 hour;
B, steam injection well stop discharge opeing, producing well long tube note 3-10 hour, and producing well stopped note after 1-2 hour, steam injection well long tube discharge opeing 3-10 hour;
C, repetitive cycling carry out step a and step b 10-15 time;
Step 4: pure steam noted by steam injection well length pipe simultaneously, the discharge opeing simultaneously of producing well length pipe, proceeds to the SAGD production phase, completes described interlayer heterogeneous body heavy crude reservoir SAGD and start.
2. interlayer heterogeneous body heavy crude reservoir SAGD starting method according to claim 1, wherein, in described step one, when steam injection well and producing well carry out steam injection equipressure cyclic preheat, the flowing bottomhole pressure (FBHP) of steam injection well is equal with producing well flowing bottomhole pressure (FBHP), all than initial reservoir pressure height 0.2-0.4Mpa.
3. interlayer heterogeneous body heavy crude reservoir SAGD starting method according to claim 1, wherein, in described step one, the injection rate of steam injection well and producing well steam is 100-200m
3/ day, the drain age velocity of steam injection well and producing well is 100-200m
3/ day, described steam is 80-100% in the steam quality of steam injection well and producing well well head.
4. interlayer heterogeneous body heavy crude reservoir SAGD starting method according to claim 1, wherein, in described step 2 and step 3, when the lithology of described interlayer be clay mineral or mud stone time, in steam injection well and producing well, inject pure steam;
When the lithology of described interlayer be tight sand or carbonate rock time, in steam, add concentration is inject steam injection well and producing well after the acid solution of 20-28wt%.
5. interlayer heterogeneous body heavy crude reservoir SAGD starting method according to claim 4, wherein, described acid solution comprises hydrochloric acid, formic acid, acetic acid, chloroacetic acid, hydrofluoric acid or mud acid.
6. interlayer heterogeneous body heavy crude reservoir SAGD starting method according to claim 5, wherein, in described mud acid, the content of hydrofluoric acid is 3wt%-5wt%, and the content of hydrochloric acid is 12wt%-15wt%.
7. interlayer heterogeneous body heavy crude reservoir SAGD starting method according to claim 1, wherein, in described step 2, flowing bottomhole pressure (FBHP) when producing well carries out discharge opeing is lower than initial reservoir pressure 0.0-0.3MPa.
8. interlayer heterogeneous body heavy crude reservoir SAGD starting method according to claim 1, wherein, in described step 2, the steam injection rate of steam injection well is 100-200m
3/ day, described steam is 80-100% in the steam quality of steam injection well well head; The steam injection rate of producing well cyclic preheat is 100-200m
3/ day, described steam is 80-100% in the steam quality of producing well well head, and the drain age velocity of producing well cyclic preheat is 100-200m
3/ day.
9. interlayer heterogeneous body heavy crude reservoir SAGD starting method according to claim 1, wherein, in described step 3, the steam injection pressure of steam injection well and producing well all exceedes oil reservoir fracture pressure 0.3-0.5MPa, and flowing bottomhole pressure (FBHP) when steam injection well and producing well discharge opeing is all lower than initial reservoir pressure 0.0-0.3MPa.
10. interlayer heterogeneous body heavy crude reservoir SAGD starting method according to claim 1, wherein, in described step 3, the injection rate of steam injection well and producing well is 200-300m
3/ day, the drain age velocity of steam injection well and producing well is 200-300m
3/ day, described steam is 80-100% in the steam quality of steam injection well and producing well well head.
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