CN105178931B - A kind of method that speed is produced on raising SAGD initial stages - Google Patents
A kind of method that speed is produced on raising SAGD initial stages Download PDFInfo
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- CN105178931B CN105178931B CN201510559419.5A CN201510559419A CN105178931B CN 105178931 B CN105178931 B CN 105178931B CN 201510559419 A CN201510559419 A CN 201510559419A CN 105178931 B CN105178931 B CN 105178931B
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Abstract
The invention provides a kind of method that speed is produced on raising SAGD initial stages.This method includes：1) the reservoir minimum principal stress of oil reservoir is determined in the horizontal direction；2) steam injection well and producing well are disposed respectively in the vertical direction of oil reservoir；3) inject liquid phase mixed solvent stage by stage into producing well and steam injection well, form inter-well pressure UNICOM, and form above horizontal well vertical dilatation band；4) liquid phase mixed solvent is entered after the interior immersion of dilatation band, vertical low-viscosity region is formed above steam injection well；5) steam is injected to two horizontal wells, or individually carries out circulation preheating to producing well injection steam；6) it was transferred to for half SAGD stages, when forming balanced flood between two wells, and producing well and the steam injection well are when being in same pressure system, are transferred to the normal SAGD stages.The present invention can reduce traditional low yield time at SAGD initial stages, improve production speed and oil-producing speed at initial stage on SAGD initial stages, accelerate the arrival of peak value yield, improve Project Economy Benefit.
Description
Technical field
The present invention relates to a kind of method that speed is produced on raising SAGD initial stages, belong to field of petroleum exploitation.
Background technology
10000mPas heavy crude reservoir is reached for Crude viscosity under reservoir temperature, SAGD is a kind of high-efficiency and economic
Development technique, its horizontal well pair by making a call to vertical a pair 5 meters of spacing in oil reservoir bottom, is continuously injected into steaming in upper water horizontal well
Vapour, the viscous crude and condensed water of pumping extraction heating in bottom water horizontal well.
SAGD oil-producings rule (as shown in Figure 1) is generally divided into：Rise the platform after (correspondence vapor chamber uphill process), peak value
The three phases such as phase (vapor chamber is extending transversely), oil production decay (vapor chamber decline).The rate of climb of usual vapor chamber at initial stage
Slowly (as shown in Figure 6), for a SAGD well pair being deployed in 30 meters of thick oil pays, 10 years left sides of production cycle average out to
The right side, and vapor chamber may need 2-3 to top, the stage oil production is low, and steam consumption is big, causes whole SAGD accumulations oil gas
Than low, economy is not good.
Therefore, raising SAGD produces speed on initial stage turns into one of this area urgent problem to be solved.
The content of the invention
In order to solve the above technical problems, it is an object of the invention to provide the side that speed is produced on a kind of raising SAGD initial stages
Method, this method can reduce traditional low yield time at SAGD initial stages by crustal stress regulation control, solvent soaking and oil recovery by heating,
Production speed and oil-producing speed at initial stage on SAGD initial stages are improved, accelerates the arrival of peak value yield, Project Economy Benefit is improved.
To reach above-mentioned purpose, the invention provides a kind of method that speed is produced on raising SAGD initial stages, this method includes
Following steps：
Step 1: determine the reservoir minimum principal stress of oil reservoir (could produce vertical expansion in the horizontal direction under the premise of herein
Hold band)；
Step 2: the vertical direction in the oil reservoir disposes a pair of horizontal wells, wherein, the horizontal well on vertical direction top is
Steam injection well, the horizontal well of vertical direction bottom is producing well；
Step 3: injecting liquid phase mixed solvent stage by stage into the producing well and steam injection well, make the producing well and institute
Gas injection well formation inter-well pressure UNICOM is stated, and forms in the top of the horizontal well the vertical dilatation band (skill that the present invention is provided
Art scheme can be during extending capacity reformation be carried out by injecting liquid phase mixed solvent stage by stage to reservoir, it is to avoid destruction lid
Layer forms uncontrolled large fracture equivalent risk in reservoir)；
Step 4: the liquid phase mixed solvent is entered in the dilatation band formed in step 3, immersion, in the steam injection well
Top formed vertical low-viscosity region (by immersion, liquid phase mixed solvent can dissolve into adjacent viscous crude phase, spread,
A vertical low-viscosity region is formed in the top of steam injection well), the viscosity in the low-viscosity region is less than the glutinous of reservoir viscous crude
(for the Di Nian areas are with respect to reservoir viscous crude, its size depends on the dilatation area formed above steam injection well, the low-viscosity area to degree
The viscosity scope in domain is influenceed by factors such as the viscositys of the species of solvent, the content of solvent and reservoir viscous crude；Surveyed according to experiment
Result is measured, for xylene solvent, the quality percentage of solvent is 10%, and viscosity of the reservoir viscous crude at 50 DEG C is
100000mPas, the viscosity after mixing at 70 DEG C is 1000mPas)；
Step 5: injecting steam to the producing well and steam injection well, or individually carried out to producing well injection steam
Circulation preheating, when the producing well and steam injection well formation Jing Jian heating power UNICOMs, stops injection steam；
Step 6: be transferred to for half SAGD stages, when the producing well and steam injection well formation balanced flood, and the production
When well and the steam injection well are in same pressure system (producing well and steam injection well inter-well pressure UNICOM are uniform), stop half SAGD
Operation, being transferred to the normal SAGD stages (after above-mentioned steps three terminate, forms pressure UNICOM, but due to Viscosity of Heavy Crude Oil between well between well
Height, stress reaction is delayed larger, in half SAGD operation, not only noted by steam injection well but also adopt (to steam injection well inject steam when, from
Long tube injection, short tube return row) and producing well is only adopted and not noted, and can reach the purpose of Jing Jian heating power UNICOM and fluid communication, now
The heated crude oil of top can be leaked into smoothly in producing well under gravity very much, and if being not added with this step, possible portion
Fen Jingjian heating power UNICOM or fluid communication are not completely set up, and turning SAGD by force can cause pressure difference between well big, part well section
UNICOM is broken through, and other parts can not UNICOM on horizontal segment.Thus half SAGD is the transitional link of a reduction risk).
The technical scheme that the present invention is provided creatively is proposed：First determine reservoir minimum principal stress in the horizontal direction, then
A vertical dilatation band full of solvent is formed above steam injection well according to this premise, and one is formed vertically by soaking
Low-viscosity region, promote to turn after SAGD, vapor chamber is quickly developed in this low-viscosity region, and top is quickly arrived, so as to carry
The draining speed at high SAGD initial stages.
In the above-mentioned methods, it is preferable that step at the beginning before, be additionally included on the well group in identical oil reservoir region carry out
Detecting earth stress, (step can be obtained the step of cap rock, reservoir, the minimum principal stress of substrate rock stratum of same layer position are tested respectively
Reservoir minimum principal stress is obtained, the secure reference data of subsequent operation is used as).
In the above-mentioned methods, it is preferable that in step 2, distance of the producing well apart from oil reservoir bottom is less than 1m；More
Preferably, the producing well is 5m in the distance of vertical direction with the horizontal well.
In the above-mentioned methods, it is preferable that in step 3, the composition of the liquid phase mixed solvent include dimethylbenzene and/or
Gas-oil (gas-oil is mixture of the live reservoir viscous crude through air-distillation, the boiling point extracted in diesel oil section), but not
It is limited to this, those skilled in the art can be according to the combined factors such as the security of execute-in-place, heat endurance, cost, ready availability
Consider, the suitable liquid phase mixed solvent of selection, can be according to actual cost when dimethylbenzene and gas-oil are used in mixed way in the application
The need for control both mixed proportion；It is highly preferred that the viscosity of the liquid phase mixed solvent is less than 1cP, viscosity is low to be conducive to
Pressure accelerates the implementation of the measure in the diffusion of underground.
In the above-mentioned methods, it is preferable that in step 3, liquid is injected stage by stage into the producing well and the steam injection well
Comprise the following steps when mixing solvent：
A, starting stage：Inject liquid phase mixed solvent simultaneously to improve underground pressure to the producing well and the steam injection well
Power, during down-hole pressure is improved, keeps the underground pressure difference between the producing well and the steam injection well to be less than 500kPa,
And monitor the injection rate of down-hole pressure and liquid phase mixed solvent；
B, pressure test stage：The down-hole pressure of reduction wherein a bite well, maintain another mouthful of well down-hole pressure it is constant enter
Row pressure test, to judge the pressure field centered on producing well and steam injection well with the presence or absence of influencing each other, if there is mutual
Influence then stops pressure test, is transferred to step c operation；Otherwise above-mentioned steps a operation is continued；
C, crack initiation UNICOM stage：Continue the down-hole pressure of raising steam injection well, when the down-hole pressure of steam injection well persistently rises, reach
When being begun to decline after to peak value, maintain the injection flow of liquid phase mixed solvent in steam injection well constant, so that down-hole pressure is maintained
Fluctuated near stable pressure, the microfissure of some UNICOMs is now formed between producing well and gas injection well, is filled out in these microfissures
What is filled is to form a vertical dilatation band above the liquid phase mixed solvent of injection, two horizontal wells；Wherein, the peak value is crack
Initial cracking pressure, the pressure of the stabilization is the propagation pressure in crack；It is highly preferred that improving the mistake of down-hole pressure in step a
Cheng Zhong, the lifting speed of control pressure (controls the lifting speed of down-hole pressure to exist within 0.4KPa/h in the starting stage
Within 0.4KPa/h, it can avoid injection is too fast from causing the formation of large fracture, or even destruction cap rock).
In the above-mentioned methods, it is preferable that after step c terminates, this method also includes carrying out the test of inter-well pressure UNICOM
Step, the operating process of the step includes improving the down-hole pressure of producing well, maintains the down-hole pressure of steam injection well constant, Ran Houguan
Inter-well pressure UNICOM situation is examined, when a kind of the servo-actuated of large time delay is presented in inter-well pressure on pressure-detecting device, illustrates that dilatation changes
Cause work(, when inter-well pressure on pressure-detecting device quick response, then illustrate to have formed the large fracture run through between well, dilatation changes
Make failure.
In the above-mentioned methods, it is preferable that in step c, when the down-hole pressure of steam injection well persistently rises, reach after peak value,
The step of pressure when this method also includes taking the mode of closing well test crack closure, wherein, the pressure during crack closure
Power is reservoir minimum principal stress.
In the above-mentioned methods, it is preferable that in step 4, the liquid phase mixed solvent is made to enter the expansion formed in step 3
Hold band interior, immersion, vertical low-viscosity region is formed above the steam injection well includes following operating procedure：
The down-hole pressure of the steam injection well is improved, when the down-hole pressure is higher than the reservoir minimum principal stress of the oil reservoir
When, control actually enters the flow of the liquid phase mixed solvent of reservoir, and (injection flow-liquid phase of the flow=liquid phase mixed solvent is mixed
Bonding solvent returns discharge capacity), it is ensured that the down-hole pressure of the steam injection well is less than the cap rock principal stress of the oil reservoir, now injection storage
The liquid phase mixed solvent of layer largely enters in dilatation band；When the injection rate of liquid phase solvent in the steam injection well reaches preset value
(preset value is relevant with the expected dilatation area size formed, thickness, porosity of oil reservoir etc. is depended primarily on, in safe and reasonable
Pressure limit in, the dilatation area of the bigger formation of amount of injection is bigger, during field operation the preset value can with it is anticipated that formed
Dilatation area volume 3% calculate), stop injection, closing well immersion；It is highly preferred that the time of the closing well immersion is 1 day.
In the above-mentioned methods, it is preferable that in immersion process, this method is also mixed including monitoring down-hole pressure, filling into liquid phase
The step of bonding solvent is to maintain down-hole pressure, expand the low-viscosity area thickness, the thickness in low-viscosity region is bigger, then this is low
The volume in viscosity region is also bigger, and the speed of SAGD vapor chambers at initial stage extension is faster, and business efficiency is better, but increase is thick
Degree is limited by the factors such as the diffusion velocity of solvent, injection pressure size, injection quantity of solvent, thus should can be connect in safety, cost
Increase its thickness as far as possible by the case of.
In the above-mentioned methods, it is preferable that the down-hole pressure is to be calculated to obtain by well head pressure+vertical section head of liquid
's；It is highly preferred that the raising down-hole pressure is by improving net injection rate, that is, maintaining the injection stream of the liquid phase mixed solvent
Amount is constant, and reduce the liquid phase solvent returns what discharge capacity was operated.
In the above-mentioned methods, it is preferable that in step 5, steam is injected to the producing well and steam injection well, or individually
When injecting steam to the producing well, the pressure of the steam is controlled to be higher than reservoir pore pressure, and less than reservoir minimum principal stress；More
Preferably, when carrying out circulation preheating, the preheating time is 1 week.
In the above-mentioned methods, it is preferable that in step 6, the half SAGD stages include injecting steam to the steam injection well
Carry out steam circulation, the step of adopting liquid from the producing well；The normal SAGD stages include injecting steam to the steam injection well,
The step of being recovered the oil from producing well.
In the above-mentioned methods, it is preferable that in step 2, the producing well and the steam injection well using barefoot completion and
Tripping in cutting seam sieve tube completion in horizontal well；Each one of tripping in length oil pipe is distinguished in cutting seam sieve tube, wherein, the short tube oil pipe
Positioned at the level segment start point of horizontal well, long tube is located at the horizontal segment endpoint of horizontal well.
In the above-mentioned methods, it is preferable that after step 2 terminates, before step 3 starts, this method also includes to the life
The step of pit shaft of production well and the steam injection well is pre-processed；It is highly preferred that described pre-process including the use of clear water to described
The borehole wall of pit shaft (ensure that the liquid phase mixed solvent injected from well head enters storage after being cleaned by carrying out cleaning to the borehole wall
In layer), circulated (using high temperature mineralized water to enter in the producing well and the steam injection well using the high temperature mineralized water at scene
Row circulation repeatedly heating the borehole wall viscosity of near wellbore zone part viscous crude can be made to decline) or by the liquid phase mixed solvent injection
(soaked in the producing well and the steam injection well and the step of immersion using liquid phase mixed solvent, liquid phase mixed solvent energy
It is enough to dissolve, spread, so as to reduce the viscosity of viscous crude in viscous crude).
Beneficial effects of the present invention：
1) traditional scheme is concentrated mainly on quick, the uniform UNICOM between dual horizontal well, and the technical scheme that the present invention is provided
Creatively propose：First determine reservoir minimum principal stress in the horizontal direction, then formed according to this premise above horizontal well
One vertical dilatation band full of solvent, and a vertical low-viscosity region is formed by soaking, promote to turn after SAGD, steam
Vapour chamber is quick to develop in this ground viscosity region, and quickly arrives top；
2) compared with traditional scheme, the technical scheme that provides of the present invention due to crude oil formation of being heated fluid column effective depth most
High (to top), thus gravity drainage speed is fast；
3) compared with traditional scheme, contact surface of the steam with not employing heavy crude reservoir in the technical scheme that the present invention was provided
Product is bigger, and more preferably, economic benefit is significantly improved heat-transfer effect.
Brief description of the drawings
Fig. 1 is the schematic diagram of SAGD oil-producing rules；
Fig. 2 is the 3 D stereo schematic diagram that reservoir is injected after liquid phase mixed solvent progress extending capacity reformation；
Fig. 3 is that the effect that reservoir is injected after liquid phase mixed solvent progress extending capacity reformation on the vertical cross-section for crossing horizontal well is shown
It is intended to；
Fig. 4 is that reservoir injects the effect on the vertical cross-section perpendicular to horizontal well after liquid phase mixed solvent progress extending capacity reformation
Fruit schematic diagram；
Fig. 5 is the development models schematic diagram that vapor chamber after dilatation is carried out using liquid phase mixed solvent；
Fig. 6 is the development models schematic diagram of conventional vapor chamber.
Embodiment
In order to which technical characteristic, purpose and beneficial effect to the present invention are more clearly understood from, now to the skill of the present invention
Art scheme carry out it is described further below, but it is not intended that to the present invention can practical range restriction.
Following examples are that following target reservoirs are carried out, target reservoir buried depth 440m, flat during 50 DEG C of the oil reservoir
Equal Crude viscosity is 106000mPas, and oil density is 0.9677g/cm, and porosity is 30%, and permeability is 1.4 darcies, existing
Field test minimum principal stress is 6.3MPa.
Embodiment
A kind of method that speed is produced on raising SAGD initial stages is present embodiments provided, it comprises the following steps：
1) it is drilled well：Well technological requirement is drilled with traditional dual horizontal well SAGD identical, be first less than 1 meter away from oil reservoir bottom
Location arrangements bottom water horizontal well, be designated as producing well (P wells)；Then under the guiding of magnetic steering, one is made a call at 5 meters above it
Parallel horizontal well, is designated as steam injection well (I wells)；Horizontal 400 meters of segment length, borehole diameter 8.5in；Horizontal well group is in the horizontal plane
Projection is selected in biggest principal stress direction as far as possible；Barefoot completion and the tripping in cutting seam sieve tube completion in horizontal well；Tubular column structure with
Traditional dual horizontal well SAGD is identical, each one of tripping in length oil pipe is distinguished in cutting seam sieve tube, wherein short tube is lowered into level
Near the level segment start point of well, and long tube is lowered into the afterbody of horizontal segment, and the corresponding temperature of tripping in, pressure monitoring pipe in well
Line；
2) pit shaft is pre-processed：It is drilled after well and cleans borehole wall mud repeatedly using clear water, acidification is done if necessary, it is ensured that from
Well head injection fluid can be entered in reservoir；Live high temperature mineralized water (after boiler wastewater processing) can be used in dual horizontal well
Inner loop, method is, from long tube injection, to be returned out from short tube, or inverse operation, by heating repeatedly after the borehole wall, near wellbore zone
Part Viscosity of Heavy Crude Oil declines；Or, it can also inject mixed solvent after mud has been cleaned and soaked, by solvent thick
Dissolving in oil, spread to reduce the viscosity of viscous crude；
3) detecting earth stress：Representative other well groups of same block are selected (to refer to and come from geomechanics angle
Say the well group for the crustal stress states that can represent this block, should avoid using block edges, have intrinsic fracture development situations such as well
Group), the minimum principal stress of the cap rock, reservoir, substrate rock stratum with layer position is tested, the reference data of minimum principal stress is obtained；
4) extending capacity reformation：First to IP well simultaneous implantation liquid phase mixed solvent (liquid phase mixed solvents used in the present embodiment
For dimethylbenzene and gas-oil, both mixed proportions can be controlled according to the need for running cost) to improve the wells of IP wells
(down-hole pressure is calculated and drawn that the mode of operation of pressure-raising is that maintaining liquid is mixed to lower pressure by well head pressure+vertical section head of liquid
The injection flow of solvent is constant, and reduce liquid phase mixed solvent returns discharge capacity, that is, improves net injection rate), improving down-hole pressure
During, keep the underground pressure difference between the producing well and the steam injection well to be less than 500kPa, meanwhile, control pressure is carried
Lifting speed is within 0.4KPa/h, and the fluid liquid measure of continuous monitoring down-hole pressure and injection reservoir, the process enters the liquid of reservoir
Amount is very low；
Then whether the down-hole pressure of reduction I wells or P wells, maintain to have between the down-hole pressure of another mouthful of well, two wells of test
Certain stress reaction, when low pressure borehole pressure slowly slightly rises, shows there is stress reaction between two wells, stops test；
Then it is transferred to the crack initiation UNICOM stage：(mode of operation of pressure-raising is same for pressure first further in slow raising I wells
On：Maintain that injection flow is constant, discharge capacity is returned in reduction), when monitoring that down-hole pressure persistently rises, to peaking after when falling after rise
(surge pressure is fracture initiation pressure, is reached after fracture initiation pressure, when taking the mode of closing well to test crack closure
Pressure, as minimum principal stress), it is changed to keep the injection flow of liquid phase mixed solvent constant, the change of strict monitoring down-hole pressure
Change situation, can maintain fluctuation (the relatively stable pressure near a relatively stable pressure value after down-hole pressure falls after rise
Value is propagation pressure)；
Next, can improve the injection pressure in P wells with reverse operating, maintain the down-hole pressure of I wells constant, reinforcing
Fluid communication between IP wells；
The test of pressure UNICOM is then carried out, that is, reduces the down-hole pressure of a certain well, the down-hole pressure of another well, observation is maintained
Pressure UNICOM situation, if a kind of the servo-actuated of large time delay can be presented in extending capacity reformation success, pressure, if quick response, illustrates well
Between formed the large fracture run through, transformation failure；
After extending capacity reformation success, a vertical dilatation band can be formed above horizontal well, as shown in Figure 2,3, 4 (σ in Fig. 2
H-reservoir-level maximum principal stress；σ v-vertical the principal stress of reservoir；σ h-reservoir-level minimum principal stress)；
5) soak：P wells are stopped operation after keeping down-hole pressure, inject liquid phase mixed solvent by the long tube of I wells, short tube adds
Voltage-controlled liquid phase mixed solvent processed is returned out, improves constantly well head pressure, and reservoir operating pressure also constantly rises；When down-hole pressure is higher than
After reservoir minimum principal stress, strict control actually enters the flow of the liquid phase mixed solvent of reservoir, and (flow=injection flow-is returned
Discharge capacity), it is ensured that down-hole pressure no longer rapid increase, or even (if this trend, can properly increase and return close to cap rock principal stress
Arrange speed), the fluid for now injecting reservoir largely enters dilatation area, and the process continues slow progress, until reaching setting
(injection rate of the setting can be according to the imbibition ability system of unit length net horizontal section during live Jing Jian UNICOMs untill injection rate
It is fixed)；Note, valve door are then shut off, pressure change is monitored in well head, if pressure decline is very slow, the state can be kept simultaneously
Closing well is soaked more than one day, in immersion process, and a vertical low-viscosity region can be formed above steam injection well；If pressure is quick
Decline, and during close to reservoir pore pressure, a certain amount of solvent can be supplemented, maintain down-hole pressure, expand the thickness in low-viscosity region
Degree；
6) high steam is circulated between IP wells：After high pressure hydration more than one day, in P wells injecting high temperature and high pressure steam is carried out
Circulation (or IP wells inject steam and circulated simultaneously), steam injects from long tube, returned out from short tube, and steam pressure should be higher than that storage
Layer pore pressure and less than reservoir minimum principal stress；Circulate after preheating one week, thermal communication state between testing well, method of testing is：Take P
Well (typically no longer disposing temperature measuring equipment due to long-term steam injection in tripping in temperature test pipeline, I wells typically in P wells) stops
Steam circulation, monitors the change of downhole temperature；When response of ging up after downhole temperature is fallen before is fast, the heat in the well section can determine whether
UNICOM's situation is preferable；If UNICOM's degree of whole net horizontal section reaches design objective, you can stop HTHP steam injection and follow
Ring；
7) the half SAGD stages：Then it was transferred to for half SAGD stages, still maintains higher operating pressure, stage I wells continues to note
(short tube is injected steam circulation, and long tube is returned out；Or opposite), P wells only adopt liquid from short tube, and centre maintains the steam injection amount of I wells constant,
The discharge capacity of returning of I wells is constantly reduced, the Liquid output and temperature, pressure change of P wells is monitored；It is whole when the Liquid output in P wells quickly increases
Individual well is to reaching balanced flood, and P wells with I wells when being completely in same pressure system, can stop half SAGD operation；
8) the normal SAGD stages：
1. high pressure SAGD：SAGD initial stages are transferred to, operation with high pressure is still maintained, reduced as far as possible above I wells in low-viscosity region
Low-viscosity fluid (if low-viscosity fluid is quickly produced, the thickness in low-viscosity region can on the one hand dropped by quick extraction
Low, on the other hand can make the viscosity of fluid in low-viscosity region increases, and is unfavorable for vapor chamber Rapid development to top)；Stage I wells
Only steam injection is (typically from short tube steam injection, if necessary to improve steam injection amount, the pressure uniformity coefficient improved the standard in section, Ke Yitong
Shi Congchang short tubes steam injection), steam injection pressure is higher than reservoir pore pressure and less than reservoir minimum principal stress；The P wells then pump under short tube tail end,
Pumping is recovered the oil, and maintains the corresponding saturated-steam temperature of producing well flowing bottomhole pressure (FBHP) higher than fluid actual temperature (difference is subcool)
10 DEG C or so；Rapid development to top (as shown in Figure 5), oil production can be substantially substantially increased by the later stage in stage, vapor chamber；
2. low pressure SAGD stages：When the oil-producing speed rapid increase for monitoring the well group, and it is other apparently higher than same block
During the performance of well group, low pressure SAGD operation is transferred in good time, controls the injection pressure of steam (to be so conducive to drop close to reservoir pore pressure
Low-heat loss, improves economy).
Site test results show：Traditional scheme is concentrated mainly on quick, the uniform UNICOM between dual horizontal well, with tradition side
Case can form a vertical dilatation band full of solvent compared to the technical scheme that the present invention is provided above horizontal well, and lead to
Cross immersion and form a vertical low-viscosity region, turn after SAGD, vapor chamber is quickly developed in this low-viscosity region, and soon
Speed arrives top so that the fluid column effective depth highest (to top) of heated crude oil formation, the quickening of gravity drainage speed；At the same time,
Compared with traditional scheme, steam and the contact area for not employing heavy crude reservoir are bigger in the technical scheme that the present invention was provided, and pass
More preferably, economic benefit is significantly improved thermal effect.
Claims (17)
1. producing the method for speed on a kind of raising SAGD initial stages, this method comprises the following steps：
Step 1: determining the reservoir minimum principal stress of oil reservoir in the horizontal direction；
Step 2: the vertical direction in the oil reservoir disposes a pair of horizontal wells, wherein, the horizontal well on vertical direction top is gas injection
Well, the horizontal well of vertical direction bottom is producing well；
Step 3: injecting liquid phase mixed solvent stage by stage into the producing well and gas injection well, make the producing well and the note
Gas well formation inter-well pressure UNICOM, and form in the top of the horizontal well vertical dilatation band；
Step 4: the liquid phase mixed solvent is entered in the dilatation band formed in step 3, immersion, above the gas injection well
The viscosity formed in vertical low-viscosity region, the low-viscosity region is less than the viscosity of stratum viscous crude；
Step 5: injecting steam to the producing well and gas injection well, or individually circulated to producing well injection steam
Preheating, when the producing well and gas injection well formation Jing Jian heating power UNICOMs, stops injection steam；
Step 6: be transferred to for half SAGD stages, when the producing well and gas injection well formation balanced flood, and the producing well and
When the gas injection well is in same pressure system, stops half SAGD operation, be transferred to the normal SAGD stages；Wherein,
In step 3, include following step when injecting liquid phase mixed solvent stage by stage into the producing well and the gas injection well
Suddenly：
A, starting stage：Liquid phase mixed solvent is injected simultaneously to improve down-hole pressure to the producing well and the gas injection well,
During improving down-hole pressure, the underground pressure difference between the producing well and the gas injection well is kept to be less than 500kPa, and supervise
Survey the injection rate of down-hole pressure and liquid phase mixed solvent；
B, pressure test stage：The down-hole pressure of reduction wherein a bite well, maintains the down-hole pressure of another mouthful of well is constant to be pressed
Power is tested, to judge pressure field centered on producing well and gas injection well with the presence or absence of influencing each other, if there is influencing each other
Then stop pressure test, be transferred to step c operation；Otherwise above-mentioned steps a operation is continued；
C, crack initiation UNICOM stage：Continue the down-hole pressure of raising gas injection well, when the down-hole pressure of gas injection well persistently rises, reach peak
When being begun to decline after value, maintain the injection flow of liquid phase mixed solvent in gas injection well constant, so that down-hole pressure maintains stabilization
Pressure near fluctuate；Wherein, the peak value is the initial cracking pressure in crack, and the pressure of the stabilization is the propagation pressure in crack.
2. according to the method described in claim 1, wherein：Step at the beginning before, be additionally included in the well in identical oil reservoir region
Detecting earth stress is carried out in group, the step of cap rock, reservoir, the minimum principal stress of substrate rock stratum of same layer position are tested respectively.
3. according to the method described in claim 1, wherein：In step 2, distance of the producing well apart from oil reservoir bottom is small
In 1m.
4. the method according to claim 1 or 3, wherein：In step 2, the producing well is with the gas injection well vertical
The distance in direction is 5m.
5. according to the method described in claim 1, wherein：In step 3, the composition of the liquid phase mixed solvent includes diformazan
Benzene and/or gas-oil, wherein, the gas-oil is for live stratum viscous crude through air-distillation, the boiling point extracted in diesel oil section
Interior mixture.
6. method according to claim 1 or 5, wherein：In step 3, the viscosity of the liquid phase mixed solvent is less than
1cP。
7. according to the method described in claim 1, wherein：During down-hole pressure is improved in the step a, control pressure is carried
Lifting speed is within 0.4KPa/h.
8. method according to claim 7, wherein：After step c terminates, this method also includes the underground for improving producing well
Pressure, the step for maintaining the down-hole pressure of gas injection well constant.
9. method according to claim 7, wherein：After step c terminates, this method also includes carrying out inter-well pressure UNICOM
The step of test.
10. method according to claim 7, wherein：In step c, when the down-hole pressure of gas injection well persistently rises, reach
After peak value, the step of pressure when this method also includes taking the mode of closing well test crack closure, wherein, the crack closure
When pressure be reservoir minimum principal stress.
11. according to the method described in claim 1, wherein：In step 4, the liquid phase mixed solvent is set to enter in step 3
In the dilatation band of formation, immersion, vertical low-viscosity region is formed above the gas injection well includes following operating procedure：
The down-hole pressure of the gas injection well is improved, when the down-hole pressure is higher than the reservoir minimum principal stress of the oil reservoir, control
System actually enters the flow of the liquid phase mixed solvent of reservoir, it is ensured that the down-hole pressure of the gas injection well is less than the cap rock of the oil reservoir
Principal stress；
When the injection rate of liquid phase solvent in the gas injection well reaches preset value, stop injection, closing well immersion.
12. method according to claim 11, wherein：The time of the closing well immersion is 1 day.
13. method according to claim 11, wherein：In immersion process, this method also includes monitoring down-hole pressure, mended
The step of entering liquid phase mixed solvent to maintain down-hole pressure, expand the low-viscosity area thickness.
14. the method according to claim any one of 1-3, wherein：The down-hole pressure is by well head pressure+vertical section liquid
Column pressure calculates what is obtained.
15. the method according to claim any one of 1-3, wherein：It is described raising down-hole pressure be by improving net fluence,
Maintain the injection flow of the liquid phase mixed solvent constant, the discharge capacity that returns for reducing the liquid phase mixed solvent is operated
's.
16. according to the method described in claim 1, wherein：In step 5, steam is injected to the producing well and gas injection well,
Or when individually to producing well injection steam, control the pressure of the steam to be higher than reservoir pore pressure, and it is minimum less than reservoir
Principal stress.
17. the method according to claim 1 or 16, wherein：In step 5, when carrying out circulation preheating, during the preheating
Between be 1 week.
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| CN107313756B (en) * | 2017-07-04 | 2019-06-25 | 中国石油大学(北京) | The jet stream connection of SAGD mudstone foundation is made to squeeze sour remodeling method |
| CN112392472B (en) * | 2019-08-19 | 2022-08-02 | 中国石油天然气股份有限公司 | Method and device for determining integrated development mode of shale and adjacent oil layer |
| CN112443302A (en) * | 2019-08-28 | 2021-03-05 | 中国石油天然气股份有限公司 | SAGD production method |
| CN112746830A (en) * | 2019-10-30 | 2021-05-04 | 中国石油天然气股份有限公司 | Oil reservoir two-stage branch SAGD reservoir deep expansion oil extraction method |
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