CN104895541B - Method for breaking interlayer in oil layer during double-horizontal-well SAGD exploitation - Google Patents
Method for breaking interlayer in oil layer during double-horizontal-well SAGD exploitation Download PDFInfo
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Abstract
The invention provides a method for breaking an interlayer between oil layers in double horizontal wells SAGD (steam assisted gravity drainage) exploitation, which comprises the steps of excavating a tunnel in an oil extraction area of a steam injection well and a production well, wherein the tunnel transversely extends towards the direction extending towards the horizontal section of the steam injection well, the tunnel longitudinally penetrates through the interlayer to communicate the oil layers on two sides of the interlayer, a diversion medium is filled in the tunnel to form a flow passage for steam and crude oil to flow through, steam is injected into the steam injection well, the steam is conveyed into the oil layer above the interlayer through the flow passage, thick oil above the interlayer is heated and reduced in viscosity, and the reduced crude oil enters the production well through the flow passage to be extracted from the production well. The invention can communicate oil layers on the upper side and the lower side of the interlayer, effectively convey steam and crude oil from one side of the interlayer to the other side of the interlayer, ensure the balanced development of a steam cavity in the horizontal direction and the vertical direction, fully exert the advantages of a horizontal well and have low cost.
Description
Technical field
The present invention relates to break through oil in the method for dual horizontal well SAGD exploitations, more particularly to a kind of dual horizontal well SAGD exploitations
The method of layer interval interlayer.
Background technology
The stock number of global super-viscous oil is huge, as a cutting edge technology for developing viscous crude in the world, SAGD (Steam-
Assisted Gravity Drainage, i.e. SAGD) Canadian oil-sand exploitation in occupy the principal status of public economy,
China Liaohe River, Xinjiang Oilfield have also obtained scale application.This method be using horizontal well, steam come effectively heavy crude producing,
The resources such as super-viscous oil.By being continuously injected into high mass dryness fraction water vapour, the release vaporization latent heat storage of steam overlying to horizontal steam injection well
Layer, heated Viscosity of Heavy Crude Oil declines to a great extent and let out down under gravity with steam condensate, finally from the water of oil reservoir bottom
Horizontal well output.Because reservoir fluid is constantly plucked out of, steam is extended along the vertical and horizontal directions, forms the steaming constantly developed
Vapour chamber.Relative to other heavy oil development technologies, this method has high gas oil ratio and recovery ratio.
One of every interlayer is to form reservoir heterogeneity the main reason for, it, which exists, has had a strong impact on SAGD productions.Spread
Larger is generally made up of every interlayer the mud stone that porosity is small, permeability is low, degree of consolidation is high, and the fluid such as steam, crude oil is without oozing
Stream passes through, and can only slowly stream, and greatly limit the vertical of vapor chamber and expands to the speed on top, thus is referred to as vapor chamber development
Baffle plate.Development is studied every the thing mould of interlayer and confirmed between injection-production well：It is short between well to influence very little every interlayer, it is longer to be reduced every interlayer
Oil-producing speed, and (not developed completely every interlayer in injection-production well middle) under connection situation, every interlayer will cause top crude oil without
Method produces.And show for development above steam injection well every the numerical simulation study of interlayer, it is bigger, from steam injection well more every interlayer spread
Closely, permeability is lower more unfavorable to SAGD exploitations.On the whole, cause slow upper production, cumulative oil production and gas oil ratio inclined every interlayer
It is low, it is necessary to carry out the research work targetedly broken through every interlayer.
Common breakthrough can be divided into two major classes every sandwich technique, and one kind is to rely on rock mechanics method, shearing or stretching
Fail broken rock in situ, can form narrow and small crack in this case, and its percolation ability is weaker, it is necessary to longer under ground stress environment
Aquation, creep and the fluid erosion of time acts on and forms effective seepage channel, and actually such method needs high pressure and height
Temperature, this will improve steam-front pressure for operation with high pressure, reduce every interlayer rock effective stress, so as to reduce its intensity, for shearing
Failure provides may.And high-temperature operation is possible to cause and risen every interlayer rock interior pore pressure, mudstone foundation is caused to shrink, so
Tensile failure (class hydraulic fracturing) be present；Another kind of is direct part physical removal every interlayer rock, establishes hypertonic flow-guiding channel,
Such method does not need HTHP, it is only necessary to certain technical matters, but be the drawbacks of existing such technology：It is fixed to be difficult to
Position ground lower interlayer, so as to which cost is high, risk is big.
The content of the invention
The method of oil reservoir interval interlayer is broken through in being exploited it is an object of the invention to provide a kind of dual horizontal well SAGD, will can be steamed
Vapour every interlayer side by being effectively transported to every interlayer opposite side, and cost is low.
To reach above-mentioned purpose, the present invention proposes to break through the side of oil reservoir interval interlayer in a kind of dual horizontal well SAGD exploitations
Method, the dual horizontal well include steam injection well and producing well, and the steam injection well includes steam injection well horizontal segment and steam injection well vertical section, institute
Stating producing well includes producing well horizontal segment and producing well vertical section, and the flat section of steam injection well water is located on the producing well horizontal segment
It is square and parallel with the producing well horizontal segment, it is located at every interlayer above the steam injection well horizontal segment, wherein, in the breakthrough oil reservoir
Comprise the following steps every the method for interlayer：
Step A：Tunnel is excavated in the oil recovery region of the steam injection well and the producing well, the tunnel is laterally towards institute
The direction extension of steam injection well horizontal segment extension is stated, the tunnel makes the oil every interlayer both sides longitudinally through described every interlayer
Layer is connected；
Step B：Permeable medium is filled in the tunnel, makes to form the circulation flowed through for steam and crude oil in the tunnel
Passage.
The method of oil reservoir interval interlayer is broken through in dual horizontal well SAGD exploitations as described above, wherein, the breakthrough oil reservoir
The method of interval interlayer is further comprising the steps of：
Step C：After filling permeable medium into the tunnel, steam is injected to the steam injection well, steam is via the stream
Circulation passage is delivered in the oil reservoir above interlayer, the viscous crude above interlayer is heated, is dropped glutinous, the original after drop is glutinous
Oil enters in the producing well via the circulation passage；
Step D：Recovered the oil from the producing well.
The method of oil reservoir interval interlayer is broken through in dual horizontal well SAGD exploitations as described above, wherein, the steam injection well and
The producing well is arranged in the first perpendicular, is excavated tunnel along first perpendicular, is made the steam injection well water well
Section and the producing well horizontal segment are respectively positioned in the tunnel.
The method of oil reservoir interval interlayer is broken through in dual horizontal well SAGD exploitations as described above, wherein, the producing well is set
Put in the first perpendicular, the steam injection well is arranged in the second perpendicular, first perpendicular and described second
Perpendicular is parallel and separately, and tunnel is excavated along first perpendicular, makes the producing well horizontal segment positioned at described
In tunnel, the flat section of steam injection well water is located on the outside of the tunnel.
The method of oil reservoir interval interlayer is broken through in dual horizontal well SAGD exploitations as described above, wherein, the steam injection well and
The producing well is arranged in the second perpendicular, and the first perpendicular and second perpendicular are parallel and alternate
Every, excavate tunnel along first perpendicular, make the steam injection well horizontal segment and the producing well horizontal segment be respectively positioned on it is described
On the outside of tunnel.
The method of oil reservoir interval interlayer is broken through in dual horizontal well SAGD exploitations as described above, wherein, the permeable medium
For gravel.
The method of oil reservoir interval interlayer is broken through in dual horizontal well SAGD exploitations as described above, wherein, the length in the tunnel
Degree is equal to the length of the steam injection well horizontal segment, and the width in the tunnel is equal to the borehole diameter of the steam injection well, the tunnel
Height be equal to core intersection.
The method of oil reservoir interval interlayer is broken through in dual horizontal well SAGD exploitations as described above, wherein, in the breakthrough oil reservoir
Comprised the following specific steps that every the method for interlayer：
Step S1：Horizontal well drilling eye；
Step S2：Tripping in sap excavating instrument, the sap excavating instrument include slotting function module and slotted platform, institute
State high-pressure jet boring device and coiled tubing that slotting function module includes being connected；
Step S3：Fluting, makes the high-pressure jet boring device be crept into and be passed through by the top of the lower direction oil reservoir of oil reservoir
Described every interlayer, the high-pressure jet boring device constantly sprays high-pressure fluid, and landwaste returns to ground by the coiled tubing,
When high-pressure jet boring device drilling arrives top of oil horizon, the slotting function module is recalled into oil reservoir bottom；
Step S4：The slotted platform is slided along the direction of steam injection well horizontal segment extension；
Step S5：Repeat step S3 to step S4, until the slotted platform reaches the end of steam injection well horizontal segment, tunnel
Excavation terminates；
Step S6：Permeable medium is filled into tunnel；
Step S7：Steam is injected into steam injection well, steam is delivered in the oil reservoir above interlayer via tunnel, made
The viscous crude above interlayer is heated, drop is glutinous, passes through after viscous crude drop is glutinous and is entered by the tunnel in the producing well, passes through production
Well recovers the oil.
The characteristics of breaking through the method for oil reservoir interval interlayer in the dual horizontal well SAGD exploitations of the present invention and advantage are：
1st, the present invention is broken through every interlayer using the method that tunnel is excavated in the oil recovery region of dual horizontal well, and tunnel is in horizontal stroke
The direction extension extended to (length direction) towards dual horizontal well horizontal segment, longitudinally through every interlayer, so that two above and below interlayer
The oil reservoir connection of side, tunnel can ensure vapor chamber by steam and crude oil by being transported to the opposite side every interlayer every the side of interlayer
It is low with the balanced advantage developed, give full play to horizontal well, cost on vertical direction in the horizontal direction.
2nd, using the method for the present invention, steam injection initial stage can quick oil-producing, establish heat even without long-time circulation preheating
Logical and fluid communication, can significantly reduce or even skip warm-up phase；Due to that there is provided tunnel, injection-production well spacing can be increased, improved
Cumulative gas-oil ratio.
Brief description of the drawings
The following drawings is only intended to, in doing schematic illustration and explanation to the present invention, not delimit the scope of the invention.Wherein：
Fig. 1 is the schematic diagram of dual horizontal well；
Fig. 2 is the schematic diagram of one embodiment of the present invention；
Fig. 3 is the schematic diagram of second embodiment of the present invention；
Fig. 4 is the schematic diagram of the 3rd embodiment of the present invention.
Main element label declaration：
The tunnel of 12 producing well horizontal segment of steam injection well horizontal segment 3
4 permeable mediums 5 are every the oil reservoir of interlayer 6
Embodiment
In order to which technical characteristic, purpose and the effect of the present invention is more clearly understood, now control illustrates this hair
Bright embodiment, the hollow arrow in figure represent the flow direction of steam, and filled arrows (or black arrow) represent original
The flow direction of oil.
As shown in figure 1, dual horizontal well includes steam injection well and producing well, steam injection well includes steam injection well horizontal segment 1 and steam injection well
Vertical section, producing well include producing well horizontal segment 2 and producing well vertical section, and steam injection well horizontal segment 1 is located on producing well horizontal segment 2
Square and parallel with producing well horizontal segment 2, when SAGD is produced, by being continuously injected into high-quality steam to steam injection well, steam overlying adds
Deep fat layer, heated Viscosity of Heavy Crude Oil decline and let out down under gravity with steam condensate, into producing well in be plucked out of,
But due to containing in oil reservoir every interlayer 3, every interlayer for example above steam injection well horizontal segment 1 and every the open and flat cloth of intermediate water, especially
When larger every the spread of interlayer 3, can cause the fluids such as steam, crude oil can not seepage flow by greatly limit vapor chamber and vertically expand
The speed to top is opened up, to break through every interlayer 3, the present invention proposes to break through oil reservoir interval interlayer in a kind of dual horizontal well SAGD exploitations
Method, comprise the following steps：
Step A：(in other words in the oil reservoir where steam injection well and producing well in the oil recovery region of steam injection well and producing well
It is interior) tunnel 3 is excavated, tunnel 3 is in the side that laterally (i.e. length direction) extends towards steam injection well horizontal segment 1 (or producing well horizontal segment 2)
To extension, tunnel 3 runs through in longitudinal direction (i.e. short transverse) makes the oil reservoir 6 every the both sides of interlayer 5 be connected every interlayer 5, cheats in other words
The length direction in road 3 is the direction of steam injection well horizontal segment (or producing well horizontal segment) extension, the short transverse in tunnel 3 be with every folder
The vertical direction of layer；
Step B：The filling permeable medium 4 in tunnel 3, make to form the circulation passage flowed through for steam and crude oil in tunnel 3,
In addition, permeable medium 4 is also played a supporting role to tunnel 3.
By excavate tunnel break through in oil reservoir every interlayer, steam and crude oil is passed through by circulation passage every interlayer,
So that the viscous crude above interlayer to be produced, efficiency high.
Further, the method for breakthrough oil reservoir interval interlayer of the invention is further comprising the steps of：
Step C：After filling permeable medium 4 into tunnel 3, steam is injected into steam injection well, steam is via the stream in tunnel 3
Circulation passage is delivered to the secondary development that vapor chamber is formed in the oil reservoir above interlayer 5, the viscous crude above interlayer 5 is heated,
Drop is glutinous, and the crude oil formed after drop is glutinous is input to every the lower section of interlayer 5, into producing well via circulation passage；And positioned at every interlayer
The oil reservoir of lower section, due to not limited by every interlayer, can be by the steam direct heating below interlayer after, under let out into producing well
It is interior；
Step D：Recovered the oil from producing well.
As shown in Fig. 2 first specific embodiment for the present invention, it is shown that the first of tunnel and dual horizontal well are laid out
Scheme, Fig. 2 are the vertical section figure of oil reservoir, and steam injection well and producing well are arranged in the first perpendicular, steam injection well horizontal segment 1
Positioned at the surface of producing well horizontal segment 2, it is located at every interlayer 5 above steam injection well, excavates tunnel 3 along the first perpendicular, make note
Vapour well water well section 1 and producing well horizontal segment 2 are respectively positioned in tunnel 3, i.e., tunnel 3 is also cross steam injection well horizontal segment and production well water
Flat section, and through being transported to every interlayer 5, the steam injected by steam injection well quickly through tunnel 3 above interlayer 5, being formed and steamed
The secondary development of vapour chamber, makes the vertical development of vapor chamber not influenceed by every interlayer 5, and the crude oil above interlayer 5 can also pass through hole
Let out under road 3 is quick, into producing well.The permeable medium 4 of filling can support steam injection well and producing well in tunnel 3, and ensure note
Vapour well horizontal segment 1 is parallel with producing well horizontal segment 2.
In the present invention, the spacing between steam injection well and producing well can be more than 5 meters, and specific spacing is depending on permeable medium and opens
Depending on sending out technique, and the well spacing between existing common steam injection well and producing well is 5 meters.
As shown in figure 3, second specific embodiment for the present invention, it is shown that second of layout of tunnel and dual horizontal well
Scheme, Fig. 3 are also the vertical section figure of oil reservoir, and producing well is arranged in the first perpendicular, and it is vertical that steam injection well is arranged on second
In plane, i.e. two wells are not in same perpendicular, and steam injection well horizontal segment 1 is located at the oblique upper of producing well horizontal segment 2, and first is vertical
Plane is parallel with the second perpendicular and separately, is located at every interlayer 5 above steam injection well, and tunnel is excavated along the first perpendicular
3, producing well horizontal segment 2 is located in tunnel 3, steam injection well horizontal segment 1 be located at the outside of tunnel 3, i.e., tunnel 3 passes through producing well, not
Through steam injection well, and through can be fed rapidly into every interlayer 5, the steam equally injected by steam injection well via tunnel 3 every on interlayer 5
Side, crude oil every interlayer 5 above also can via tunnel 3 quickly under let out into producing well.
In the present embodiment, the horizontal range between tunnel 3 and steam injection well horizontal segment 1 is preferably 0~2m.
As shown in figure 4, the 3rd specific embodiment for the present invention, it is shown that the third of tunnel and dual horizontal well are laid out
Scheme, Fig. 4 are also the vertical section figure of oil reservoir, and steam injection well and producing well are arranged in the second perpendicular, and steam injection well water is put down
For section 1 directly over producing well horizontal segment 2, the second perpendicular is parallel with the first perpendicular and separately, every 5, interlayer
Above steam injection well, tunnel is excavated along the first perpendicular, steam injection well horizontal segment 1 and producing well horizontal segment 2 is respectively positioned on tunnel 3
Outside, i.e. tunnel 3 do not pass through steam injection well and producing well, and tunnel runs through can pass through tunnel every interlayer 5, same steam and crude oil
3, which quickly cross the steam every interlayer 5, injected by steam injection well, to be fed rapidly into via tunnel 3 above interlayer 5, every on interlayer 5
The crude oil of side also can via tunnel 3 it is quick under let out into producing well.
In the present embodiment, the horizontal range of tunnel 3 and steam injection well horizontal segment 1 (or producing well horizontal segment 2) is preferably 0~
1m。
In a feasible technical scheme, permeable medium 4 is gravel, and gravel has high flow conductivity and larger infiltration
Rate, steam and crude oil are available for quickly through gravel also has higher bearing strength, and the circulation that can be consolidated in support tunnel is led to
Road.
Preferably, the length in tunnel 3 is equal to the length of steam injection well horizontal segment 1 (or producing well horizontal segment 2), the width in tunnel 3
Degree is equal to the borehole diameter of steam injection well (or producing well), and the height in tunnel 3 is equal to the thickness of the exploitation oil reservoir in oil recovery region, or
The vertical range that the height of tunnel 3 is more than between interlayer 5 and producing well horizontal segment 2 is said, production efficiency is improved with further
And tar productivity.
In a specific embodiment, the method bag of oil reservoir interval interlayer is broken through in dual horizontal well SAGD of the invention exploitation
Include following specific steps：
Step S1：Horizontal well drilling eye (i.e. steam injection well well and producing well well)；
Step S2：Tripping in sap excavating instrument, sap excavating instrument include slotting function module and can slided along horizontal hole
Dynamic slotted platform, slotting function module include the high-pressure jet boring device and coiled tubing being connected；
Step S3：Fluting, makes high-pressure jet boring device be crept into and be passed through every folder by the top of the lower direction oil reservoir of oil reservoir
Layer, high-pressure jet boring device constantly spray high-pressure fluid, and landwaste returns to ground by coiled tubing, when high-pressure jet perforate fills
When putting drilling to top of oil horizon, slotting function module is recalled into oil reservoir bottom；
Step S4：Slotted platform is slided along the direction of steam injection well horizontal segment (or producing well horizontal segment) extension；
Step S5：Repeat step S3 to step S4, until slotted platform arrival steam injection well horizontal segment (or producing well is horizontal
Section) end, sap excavating terminates；
Step S6：Permeable medium is filled into tunnel；
Step S7：Steam is injected into steam injection well, steam is delivered in the oil reservoir above interlayer via tunnel, made
The viscous crude above interlayer is heated, drop is glutinous, passes through after viscous crude drop is glutinous and is entered by the tunnel in the producing well, passes through production
Well recovers the oil.Due to there is provided tunnel, making the crude oil above interlayer 5 to be also plucked out of, improving tar productivity.
It is of the invention compared with existing direct part physical removal is every the method for interlayer rock, it is not necessary to be accurately positioned every folder
The particular location of layer, construction cost are low；Steam can effectively be conveyed to above interlayer, form vapor chamber secondary development；It can protect
Hinder vapor chamber balanced development in the horizontal and vertical directions, effective reduction vapor chamber in interlayer is developed to conventional SAGD is developed
Harmful effect, so as to improve cumulative recovery；Steam injection initial stage can quick oil-producing；Medium is controllable between injection-production well, it is ensured that well group
Connection；Injection-production well spacing (5 meters of tradition) can be increased, improves cumulative gas-oil ratio, in the oil reservoir developed every interlayer, numerical simulation side
Method prediction declines 15% using the maximum increase by 70% of tunnel development technique cumulative oil production, steam oil ratio (SOR)；Not by horizontal segment
The uneven influence of vapour is inhaled, longer horizontal well can be used, give full play to horizontal well advantage；Established without circulation preheating for a long time
Thermal communication and fluid communication, thus can significantly shorten or even skip warm-up phase；Gas-liquid interface is easy to control, and it is difficult to reduce SAGD regulation and control
Degree and cost；Predictable yield, reduces investment risk；Tunnel driving output landwaste can provide accurate reservoir geology information.
Domestic SAGD exploitations Reservoir Heterogeneity is strong, for shallow-layer, undersized knot super-heavy oil deposit, tunnel of the invention exploitation
Technology has the superiority that cost is low, yield potential is big, is worth carrying out technology tackling key problem and popularization and application.
The schematical embodiment of the present invention is the foregoing is only, is not limited to the scope of the present invention.It is any
Those skilled in the art, the equivalent variations made on the premise of the design of the present invention and principle is not departed from and modification, all should
Belong to the scope of protection of the invention.And it should be noted that the present invention each part be not limited in above-mentioned entirety should
With, each technical characteristic described in specification of the invention can according to be actually needed selection one individually use or select it is multinomial
Combine use, and therefore, the present invention covers the other combinations relevant with this case inventive point and concrete application in the nature of things.
Claims (7)
1. breaking through the method for oil reservoir interval interlayer in a kind of dual horizontal well SAGD exploitations, the dual horizontal well includes steam injection well and life
Well is produced, the steam injection well includes steam injection well horizontal segment and steam injection well vertical section, and the producing well includes producing well horizontal segment and life
Produce well vertical section, the flat section of steam injection well water be located at the producing well horizontal segment top and it is parallel with the producing well horizontal segment,
It is located at every interlayer above the steam injection well horizontal segment, it is characterised in that the method for breaking through oil reservoir interval interlayer includes following
Step：
Step A：Tunnel is excavated in the oil recovery region of the steam injection well and the producing well, the tunnel is laterally towards the note
The direction extension of vapour well horizontal segment extension, the tunnel make the oil reservoir phase every interlayer both sides longitudinally through described every interlayer
Connection；
Step B：Permeable medium is filled in the tunnel, formation in the tunnel is led to for the circulation that steam and crude oil flow through
Road；
Step C：After filling permeable medium into the tunnel, steam is injected to the steam injection well, steam is logical via the circulation
Road is delivered in the oil reservoir above interlayer, makes that the viscous crude above interlayer is heated, drop is glutinous, the crude oil warp after drop is glutinous
Entered by the circulation passage in the producing well；
Step D：Recovered the oil from the producing well.
2. the method for oil reservoir interval interlayer is broken through in dual horizontal well SAGD exploitations as claimed in claim 1, it is characterised in that institute
State steam injection well and the producing well is arranged in the first perpendicular, tunnel is excavated along first perpendicular, make described
Steam injection well water well section and the producing well horizontal segment are respectively positioned in the tunnel.
3. the method for oil reservoir interval interlayer is broken through in dual horizontal well SAGD exploitations as claimed in claim 1, it is characterised in that institute
State producing well to be arranged in the first perpendicular, the steam injection well is arranged in the second perpendicular, first perpendicular
It is parallel with second perpendicular and separately, tunnel is excavated along first perpendicular, makes the producing well horizontal
Section is in the tunnel, the flat section of steam injection well water is located on the outside of the tunnel.
4. the method for oil reservoir interval interlayer is broken through in dual horizontal well SAGD exploitations as claimed in claim 1, it is characterised in that institute
State steam injection well and the producing well is arranged in the second perpendicular, the first perpendicular is equal with second perpendicular
Go and separately, excavate tunnel along first perpendicular, make the steam injection well horizontal segment and the producing well horizontal segment equal
On the outside of the tunnel.
5. the method for oil reservoir interval interlayer is broken through in dual horizontal well SAGD exploitations as claimed in claim 1, it is characterised in that institute
It is gravel to state permeable medium.
6. the method for oil reservoir interval interlayer is broken through in dual horizontal well SAGD exploitations as claimed in claim 1, it is characterised in that institute
The length for stating tunnel is equal to the length of the steam injection well horizontal segment, and the width in the tunnel is straight equal to the well of the steam injection well
Footpath, the height in the tunnel are equal to core intersection.
7. the method for oil reservoir interval interlayer, its feature are broken through in the dual horizontal well SAGD exploitations as described in any one of claim 1 to 6
It is, the method for breaking through oil reservoir interval interlayer comprises the following specific steps that：
Step S1：Horizontal well drilling eye；
Step S2：Tripping in sap excavating instrument, the sap excavating instrument includes slotting function module and slotted platform, described to open
Groove functional module includes the high-pressure jet boring device and coiled tubing being connected；
Step S3：Fluting, the high-pressure jet boring device is crept into by the top of the lower direction oil reservoir of oil reservoir and pass through described
Every interlayer, the high-pressure jet boring device constantly sprays high-pressure fluid, and landwaste returns to ground by the coiled tubing, works as institute
When stating high-pressure jet boring device drilling to top of oil horizon, the slotting function module is recalled into oil reservoir bottom；
Step S4：The slotted platform is slided along the direction of steam injection well horizontal segment extension；
Step S5：Repeat step S3 to step S4, until the slotted platform reaches the end of steam injection well horizontal segment, sap excavating
Terminate；
Step S6：Permeable medium is filled into tunnel；
Step S7：Steam is injected into steam injection well, steam is delivered in the oil reservoir above interlayer via tunnel, is made described
Viscous crude above interlayer is heated, drop is glutinous, through being entered by the tunnel in the producing well after viscous crude drop is glutinous, is adopted by producing well
Oil.
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| CN103375140A (en) * | 2012-04-13 | 2013-10-30 | 中国石油天然气集团公司 | Radial horizontal well orienting device and method for operating same |
| CA2790475C (en) * | 2012-09-20 | 2019-12-03 | Statoil Canada Limited | Method for improved gravity drainage in a hydrocarbon formation |
| CN103334734A (en) * | 2013-06-09 | 2013-10-02 | 中国石油天然气股份有限公司 | Transformation method of SAGD well interlayer |
| CN104454669B (en) * | 2014-09-25 | 2016-08-24 | 中国石油天然气股份有限公司 | Jet pump and oil testing process based on same |
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