CN108252698A - Method for producing petroleum - Google Patents
Method for producing petroleum Download PDFInfo
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- CN108252698A CN108252698A CN201611256080.2A CN201611256080A CN108252698A CN 108252698 A CN108252698 A CN 108252698A CN 201611256080 A CN201611256080 A CN 201611256080A CN 108252698 A CN108252698 A CN 108252698A
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- 238000004519 manufacturing process Methods 0.000 title claims description 31
- 239000003208 petroleum Substances 0.000 title abstract description 6
- 238000000034 method Methods 0.000 claims abstract description 38
- 238000010793 Steam injection (oil industry) Methods 0.000 claims description 21
- 239000011229 interlayer Substances 0.000 claims description 13
- 238000002347 injection Methods 0.000 claims description 10
- 239000007924 injection Substances 0.000 claims description 10
- 239000003921 oil Substances 0.000 description 95
- 238000010796 Steam-assisted gravity drainage Methods 0.000 description 30
- 238000011161 development Methods 0.000 description 15
- 230000018109 developmental process Effects 0.000 description 15
- 238000011084 recovery Methods 0.000 description 14
- 238000005516 engineering process Methods 0.000 description 13
- 239000010779 crude oil Substances 0.000 description 11
- 239000000295 fuel oil Substances 0.000 description 7
- 238000010276 construction Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 230000009467 reduction Effects 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 150000003839 salts Chemical class 0.000 description 5
- 238000002485 combustion reaction Methods 0.000 description 4
- 230000009977 dual effect Effects 0.000 description 4
- 238000000605 extraction Methods 0.000 description 4
- 238000010795 Steam Flooding Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 238000011065 in-situ storage Methods 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
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- 150000001875 compounds Chemical class 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 239000003129 oil well Substances 0.000 description 2
- 239000012188 paraffin wax Substances 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 238000010025 steaming Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 241001023788 Cyttus traversi Species 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 241000219000 Populus Species 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000010426 asphalt Substances 0.000 description 1
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- 230000008859 change Effects 0.000 description 1
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- 239000013043 chemical agent Substances 0.000 description 1
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- 235000013399 edible fruits Nutrition 0.000 description 1
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- 239000012530 fluid Substances 0.000 description 1
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- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
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- 239000007921 spray Substances 0.000 description 1
- 230000000638 stimulation Effects 0.000 description 1
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- 238000012546 transfer Methods 0.000 description 1
- 239000010913 used oil Substances 0.000 description 1
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
- E21B43/30—Specific pattern of wells, e.g. optimising the spacing of wells
- E21B43/305—Specific pattern of wells, e.g. optimising the spacing of wells comprising at least one inclined or horizontal well
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
Abstract
The invention provides a method for exploiting petroleum, which comprises the following steps: arranging a horizontal well group according to the oil storage layer; injecting first steam into the horizontal well group to enable the oil reservoir to form a steam cavity; and opening a vertical well according to the oil storage layer, and injecting second steam into the vertical well so as to discharge oil bodies in the oil storage layer through the horizontal well group. The method can effectively improve the yield of petroleum.
Description
Technical field
The present invention relates to technical field of petroleum extraction, in particular to a kind of method for exploiting oil.
Background technology
It is the effective of raising oil deposit of shallow-layer super heavy exploitation using dual horizontal well SAGD in existing technical field of petroleum extraction
Technology compared with steam soak and steam drive development technology, has the advantage that daily oil production is high, gas oil ratio is high, recovery ratio is high.It is double
Horizontal well SAGD exploitations are high to reservoir conditions requirement, and the SAGD well group horizontal segments existed between I, P well and above I wells every interlayer are employed
The problems such as degree is low, and vapor chamber development is unbalanced, and well group is actually movably reduced with oil in place, causes production capacity not high.
Invention content
It is a primary object of the present invention to provide a kind of method for exploiting oil, to solve in the prior art, oil production rate is not
The problem of high.
To achieve these goals, according to an aspect of the invention, there is provided a kind of method for exploiting oil, method packet
Include following steps：Horizontal well group is opened up according to oil reservoirs；The first steam is injected in horizontal well group so that oil reservoirs form steam
Chamber；Straight well is opened up according to oil reservoirs, the second steam is injected in straight well so that the oil body of oil reservoirs is discharged by horizontal well group.
Further, horizontal well group is opened up to include the following steps：Horizontal production well is opened up, is opened above horizontal production well
If horizontal steam injection well.
Further, the first steam is injected in horizontal well group to include the following steps：It is injected in horizontal steam injection well
First steam is so that oil reservoirs form vapor chamber.
Further, vapor chamber is formed between the sandwiched area of oil reservoirs.
Further, straight well is opened up to include the following steps：Straight well is opened up in the sandwiched area for forming vapor chamber.
Further, straight well is opened up to include the following steps：Straight well is opened up in sandwiched area so that vapor chamber is formed in straight well
Between horizontal steam injection well.
Further, the second steam is injected in straight well to include the following steps：The second steam is injected in straight well, second steams
Vapour is sprayed by spray-hole to sandwiched area, so that the oil body in sandwiched area is discharged by horizontal production well.
Further, spray-hole is located at the top of horizontal production well.
Further, it is further comprising the steps of to open up straight well：Straight well is opened up in the side of the center line of horizontal well group.
Further, straight well is multiple, and the second steam is injected in each straight well.
It applies the technical scheme of the present invention, the method for the exploitation oil includes the following steps：Level is opened up according to oil reservoirs
Well group.The first steam is injected in horizontal well group so that oil reservoirs form vapor chamber.Straight well is opened up according to oil reservoirs, in straight well
The second steam is injected so that the oil body of oil reservoirs is discharged by horizontal well group.Oil can be effectively improved using this method
Yield.
Description of the drawings
The accompanying drawings which form a part of this application are used to provide further understanding of the present invention, and of the invention shows
Meaning property embodiment and its explanation do not constitute improper limitations of the present invention for explaining the present invention.In the accompanying drawings：
Fig. 1 shows the structure diagram of the embodiment of the interlayer agensis of straight well auxiliary SAGD according to the present invention；
Fig. 2 shows the overlooking the structure diagrams of the embodiment of interlayer agensis in Fig. 1；
Fig. 3 shows the structure diagram of the embodiment of the interlayer development of straight well auxiliary SAGD according to the present invention；
Fig. 4 shows the overlooking the structure diagram of the embodiment that interlayer is developed in Fig. 3.
Wherein, above-mentioned attached drawing is marked including the following drawings：
10th, horizontal well group；11st, horizontal production well；12nd, horizontal steam injection well；20th, vapor chamber；30th, straight well；31st, it sprays
Hole.
Specific embodiment
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the application can phase
Mutually combination.The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singulative
It is also intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or combination thereof.
It should be noted that term " first " in the description and claims of this application and above-mentioned attached drawing, "
Two " etc. be the object for distinguishing similar, and specific sequence or precedence are described without being used for.It should be appreciated that it uses in this way
Term can be interchanged in the appropriate case, so that presently filed embodiment described herein for example can be in addition to herein
Sequence other than those of diagram or description is implemented.In addition, term " comprising " and " having " and their any deformation, it is intended that
Be to cover it is non-exclusive include, for example, containing the process of series of steps or unit, method, system, product or equipment not
Be necessarily limited to those steps clearly listed or unit, but may include not listing clearly or for these processes, side
The intrinsic other steps of method, product or equipment or unit.
For ease of description, spatially relative term can be used herein, as " ... on ", " ... top ",
" ... upper surface ", " above " etc., for describing such as a device shown in the figure or feature and other devices or spy
The spatial relation of sign.It should be understood that spatially relative term is intended to comprising the orientation in addition to device described in figure
Except different direction in use or operation.For example, if the device in attached drawing is squeezed, it is described as " in other devices
It will be positioned as " under other devices or construction after the device of part or construction top " or " on other devices or construction "
Side " or " under other devices or construction ".Thus, exemplary term " ... top " can include " ... top " and
" in ... lower section " two kinds of orientation.The device can also other different modes positioning (being rotated by 90 ° or in other orientation), and
And respective explanations are made in opposite description to space used herein above.
Now, the illustrative embodiments according to the application are more fully described with reference to the accompanying drawings.However, these are exemplary
Embodiment can be implemented by many different forms, and should not be construed to be limited solely to embodiment party set forth herein
Formula.It should be understood that these embodiments are provided so that disclosure herein is thoroughly and complete, and these are shown
The design of example property embodiment is fully conveyed to those of ordinary skill in the art, in the accompanying drawings, for the sake of clarity, it is possible to expand
The big thickness of layer and region, and make identical device is presented with like reference characters, thus they are retouched by omitting
It states.
With reference to shown in Fig. 1 to Fig. 4, according to an embodiment of the invention, a kind of method for exploiting oil is provided.
Specifically, the method for the exploitation oil includes the following steps：Horizontal well group 10 is opened up according to oil reservoirs.In horizontal well
The first steam is injected in group 10 so that oil reservoirs form vapor chamber 20.Straight well 30 is opened up according to oil reservoirs, is injected in straight well 30
Second steam is so that the oil body of oil reservoirs is discharged by horizontal well group 10.
In the present embodiment, two kinds of mechanism of steam flooding and gravity drainage are comprehensively utilized, reserves difficulty is promoted to employ area's steam
Chamber is developed and extension, improves well group reserves exploitation rate, improves 13 to 15 percentage points of recovery ratio, reach 50%~55%.Adopt
The yield of oil can be effectively improved with this method.
Include the following steps as shown in Figure 1, opening up horizontal well group 10：Horizontal production well 11 is opened up, in horizontal production well 11
Top open up horizontal steam injection well 12.It enables in this way under the action of steam is injected, Tibetan oil can be effectively reduced
Consistency so that hide oil be oil body can quickly be flowed into horizontal production well 11 under the gravity of itself.
Further, the first steam is injected in horizontal well group 10 to include the following steps：In horizontal steam injection well 12
The first steam is injected so that oil reservoirs form vapor chamber 20.Wherein, vapor chamber 20 be formed in the sandwiched areas of oil reservoirs as (Fig. 1,
In Fig. 3 shown in A) between.Setting can further improve Tibetan oil yield in this way.
In order to further improve oil yield is hidden, open up straight well 30 and include the following steps：In the interlayer for forming vapor chamber 20
Region opens up straight well 30.Preferably, straight well 30 is opened up in sandwiched area so that vapor chamber 20 is formed in straight well 30 and horizontal steam
Between injection well 12.
Wherein, the second steam is injected in straight well 30 to include the following steps：The second steam is injected in straight well 30, second steams
Vapour is sprayed by spray-hole 31 to sandwiched area, so that the oil body in sandwiched area is discharged by horizontal production well 11.Specifically,
Spray-hole 31 is located at the top of horizontal production well 11.
Further, it is further comprising the steps of to open up straight well 30：Straight well is opened up in the side of the center line of horizontal well group 10
30.Certainly, in order to increase Tibetan oil yield, straight well 30 can be opened up into multiple, injects the second steam in each straight well 30.
Specifically, in the present embodiment, a kind of technology that development scheme is converted on the basis of dual horizontal well SAGD is provided.
Horizontal segment development degree is low, vapor chamber is developed unbalanced SAGD well groups and used being influenced to cause by reservoir heterogeneity, improves
Well group reserves exploitation rate achievees the purpose that improve rate of oil production, oil and gas when ultimate recovery.
Straight well auxiliary SAGD is developed from super-heavy oil deposit dual horizontal well SAGD technical foundation.Dual horizontal well SAGD
Well group steam chamber ascent stage and lateral extension stage, interlayer block drain path, vapor chamber rising passway, restrict vapor chamber hair
It educates, well group control reserve is caused not employ completely.
To solve the above problems, it is disposed in a manner of the utilization of old well or stepout well in SAGD well group steam chamber impaired developments section
Flatly or more mouthfuls of straight wells carry out steam injection or production, employ area's crude oil reserve.By carrying out straight well steam soak, heating straight well with
In-place oil between horizontal well realizes interwell communication.By carrying out straight well continuous steam injection, crude oil enters the steaming of SAGD well groups between driving well
Vapour chamber is simultaneously produced by SAGD producing wells, is promoted area's vapor chamber development and extension, is reached " drive is let out compound " auxiliary and improve exploitation effect
The purpose of fruit.
Using the oil production method in the embodiment, 0.4 times of rate of oil production is improved, reaches 3.5%~3.8%, improves simultaneously
Gas oil ratio 0.05, reaches 0.20.Evaluation well, observation well or the other well pattern straight wells of SAGD exploitation well group peripheries administration can be received
Enter straight well auxiliary SAGD ranges, effectively improve the utilization rate of oil wells.Oil reservoir is continuous above the horizontal steam injection well of SAGD well groups,
Region arrangement a bite straight well of vapor chamber agensis above horizontal steam injection well, perforated interval are located above horizontal steam injection well
Near.It is handled up by straight well steam injection, realizes that straight well is connected with SAGD well groups, by way of straight well steam injection and auxiliary production,
Promote the region vapor chamber development (as depicted in figs. 1 and 2).
Oil reservoir is blocked by interlayer above SAGD well group horizontal steams injection well, is hidden above horizontal steam injection well by interlayer
Region arrangement a bite straight well of gear, perforation ranking system are located above interlayer, by straight well steam soak, realize interlayer upper area
It is connected with SAGD well group steam chambers, by way of straight well steam injection and auxiliary production, promotes the region vapor chamber development and extension,
Achieve the purpose that " drive is let out compound " auxiliary improves development effectiveness.
Wherein, SAGD oil recovery techniques (Steam Assisted Gravity Drainage, abbreviation SAGD) are a kind of by steaming
A bite straight well or a bite horizontal well injection oil reservoir of the vapour above the horizontal production well near oil reservoir bottom, the original heated
Oil and steam condensate are from the oil production method of the horizontal well output of oil reservoir bottom.
SAGD is a cutting edge technology of international development super-viscous oil.Its theory is initially based on water filling and adopts salt principle, that is, notes
Enter fresh water to dissolve solid salt in salt deposit, the big salting liquid of concentration flows downward since its density is big, and density is relatively small
Aqueous solution float on above, by continuing to the water filling of salt deposit top, the continuous high concentration salt solutions in salt deposit lower part are produced.By this
As soon as principle is applied to during heat extraction by steam injection, the concept of gravity drainage is produced.SAGD is exactly steam driving exploitation mode, i.e.,
High temperature, high-quality steam are continuously injected into steam injection well, develops vapor chamber first, in heated oil reservoir and keeps certain formation pressure
(supplement stratum energy), crude oil is driven in producing well around, is then produced.
SAGD abbreviations steam assisted gravity drainage (Steam Assisted Gravity Drainage, abbreviation SAGD) is
A kind of a bite straight well or a bite horizontal well injection oil reservoir by steam above the horizontal production well near oil reservoir bottom, quilt
The crude oil and steam condensate of heating have high oil recovery ability, high oil from the oil production method of the horizontal well output of oil reservoir bottom
Vapour is than, higher ultimate recovery and reduces inter-well interference, avoids altering the advantages of logical between too early well.
Frequently problem in SAGD oil recovery techniques SAGD：
1st, reservoir quality is poor than expected, and if oil saturation is than relatively low, water saturation is higher.
2nd, producing well well screen is shaked out destruction by channeling --- it is showed more so in the artesian well of non-armored pump.
3rd, jacking capacity is insufficient, and vaporium cannot advance downwardly --- particularly well section it is very long in the case of.
4th, vaporium hypotony, it is impossible to prevent water enchroachment (invasion).
5th, TRAJECTORY CONTROL level is low, and steam injection well and producing well horizontal segment hang down away from fluctuation greatly, be easy to cause flash distillation.
The crude oil that viscous crude is asphalitine and gum level is higher, viscosity is larger.Usually ground surface density be more than 0.943,
Lower viscosity is more than the crude oil of 50 centipoises viscous crude.Because the density of viscous crude is big, also referred to as heavy oil.
Viscous crude, viscosity is more than 50 mpas or degassed crude viscosity is 1000~10000 millipascals under reservoir temperature
The high viscosity heavy crude of second.For viscous crude in addition to viscosity is high, density is also high.Viscous crude is few containing light fraction, and colloid is high with bitumen content.
The viscosity of viscous crude varies with temperature, and changes significantly, if temperature increases by 8~9 degrees Celsius, viscosity can reduce half.Therefore, to viscous crude
Exploitation, conveying, multi-purpose heating power reduces its viscosity, such as steam driving, hot-oil circulation, combustion in situ.It is dilute that incorporation can also be used
Oil, emulsification, addition activating agent reduce its viscosity.Under reservoir temperature, degassed crude viscosity is more than the crude oil of 10000 mpas
Referred to as special heavy crude oil (very heavy oil).
Viscous crude is a kind of more sticky oil as its name suggests.Because of its viscosity height, density is big, external to be generally referred to as
Heavy oil, we are accustomed to being referred to as viscous crude, this is named with respect to thin oil.The intuitive comparison of viscous crude and thin oil, we can see
It is flowed as water to thin oil, and viscous crude is difficult flowing, caused by this is viscosity of thickened oil height, some viscosity of thickened oil are up to hundreds of
Ten thousand mpas as " black mud ", can use spade, be picked up with hand.Said with the language of science, be exactly the mobility of viscous crude too
Difference, oil sticky in this way are difficult to be produced from underground naturally.
In the oil exploitation in oil field, viscous crude has special high viscosity and high-solidification point characteristic, in development and application
Various aspects all encounter some technical barriers.For production technique, colloid, asphalitine and long chain paraffin cause crude oil in reservoir
It is deteriorated with the mobility in pit shaft, it is desirable that implement the tertiary oil recovery process of high investment.Height is viscous, the conveying of High viscosity crude is necessary
Using more powerful pumping equipment, and in order to reach rational pump displacement, it is desirable that transport system is heated
Or processing is diluted to crude oil.For refinery technology, the heavy metal in heavy oil can reduce rapidly the effect of catalyst, and
And in order to which viscous crude is converted into fuel oil, it is also necessary to hydrogen is added in, is greatly increased so as to cause refinery cost, residual oil amount is big, sulphur,
The difficult component content such as nitrogen, metal, acid is high and oil plant is reluctant the reason of refining viscous crude more.As it can be seen that the special nature of viscous crude
Determine adopting, is defeated, refining what is necessarily carried out around the modification of the viscosity reduction pour point depression of viscous crude or modifying process for viscous crude.
Different DP technologies can be taken for the construction of the features such as viscosity of thickened oil is big and each oil reservoir.Heavy crude reservoir water drive is opened
Technology is adopted mainly to include mechanical viscosity reduction, pit shaft heating, dilution viscosity reduction, chemical viscosity reduction, microbial single well stimulation, take out thick process matching
Deng：Heavy crude reservoir thermal recovery technology mainly includes steam soak, steam drives, clump formula directional well and horizontal well, combustion in situ and
Mating other technologies etc. with heavy crude heat extraction.
The difficult point of combustion in situ is that implementing process difficulty is big, is difficult to control underground combustion, while high pressure injection large quantity of air
Cost again it is sufficiently expensive.And the chemical agent that chemical viscosity reduction method adds in causes stratum seriously to pollute to a certain extent.At present
Both at home and abroad to viscous crude and high solidifying oil exploitation generally using thermal recovery mode, electric-heating technology is that an electricity is worn in hollow rod
Cable, one end of cable are connected with the bottom end of hollow rod, apply exchange on the circuit being made of cable, hollow rod
Electricity realizes heating, viscosity reducing by the hollow rod heated to viscous crude or the high heat transfer for coagulating oil.Compared with other technologies, tool
There is higher efficiency, and the process operation is fairly simple, expense is relatively low, recovers the oil both economical.Therefore with apparent
Superiority is used widely in many oil fields of China.
Heavy oil development is global hang-up.In today that Chinese energy is in short supply, viscous crude resource is undoubtedly China can not
One of energy of ignorance.Most of heavy crude reservoir of China is essentially all small fault block heavy crude reservoir, and this kind of oil reservoir belongs to low product
Position petroleum resources, crude oil property is poor, and exploitation, oil recovery, surface gathering and transferring and intractability are big.
So, viscous crude field exploitation in Productivity Construction, how Above Ground Technology optimizes, should use what technology with
Method could improve whole development benefitThe He Nanxin village, the exploitation of the two small fault block viscous crude field in poplar building, are sinopec stocks
Part company " 15 " key project." current year determines block, and production capacity is built in current year drilling well for the year, and current year goes into operation ".Oil reservoir, technique, collection
Defeated " Trinity ", oil reservoir, pit shaft, ground organically combine, and form crude output capacity, oil field development overall efficiency quickly
Preferably, technological precedence level has been reached at home.
For widely used pumping well with pole, in heavy crude producing, since viscosity is excessively high, paraffin content is big so that oil
The oil flow channel of pipe reduces, and the uplink and downlink resistance of rod string increases, and when down stroke horse head easily occurs and " fights " phenomenon, upper punching
Beam rating increases during journey, can make sucker rod is stuck in oil pipe or even to cause the down-hole accident of rod broken when serious.This
Outside, for the relatively low well of reservoir temperature, standing valve for oil-well pump, standing valve cover and its with lower portion since pressure is low, producing
It is easily formed stifled well in the process, and to be forced to carry out well workover.
For electric submersible pump producing well, since electric immersible pump well discharge capacity is big, pressure is low at suction inlet, when reservoir temperature is relatively low
When, herein easy wax deposition and cause blade guiding wheel runner block, drilling fluid resistance increase, decline the discharge capacity of pump, while electricity can be made
Machine load increases, serious that motor is caused often to shut down, and prevents electric pump unit from running well.
In short, there are many difficulties in the recovery process of viscous crude, since the property of viscous crude causes the down-hole accident in exploitation
And its expense, cost for oil production can be made significantly to increase.Therefore, the research of reducing thick oil viscosity recovery method is for reducing down-hole accident
Occur and reduction thickened oil recovery cost is of great significance.
Than that described above, it is also necessary to which explanation is " one embodiment " spoken of in the present specification, " another implementation
Example ", " embodiment " etc. refer to that the specific features, structure or the feature that combine embodiment description are included in the application summary
Property description at least one embodiment in.It is not centainly to refer to same reality that statement of the same race, which occur, in multiple places in the description
Apply example.Furthermore, it is understood that when describing a specific features, structure or feature with reference to any embodiment, what is advocated is knot
Other embodiment is closed to realize that this feature, structure or feature are also fallen within the scope of the present invention.
In the above-described embodiments, it all emphasizes particularly on different fields to the description of each embodiment, there is no the portion being described in detail in some embodiment
Point, it may refer to the associated description of other embodiment.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, that is made any repaiies
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
- A kind of 1. method for exploiting oil, which is characterized in that the described method comprises the following steps：Horizontal well group (10) is opened up according to oil reservoirs；The first steam of injection in the horizontal well group (10) is so that the oil reservoirs form vapor chamber (20)；Straight well (30) is opened up according to oil reservoirs, the second steam of injection is so that the oil body of the oil reservoirs leads in the straight well (30) Cross horizontal well group (10) discharge.
- 2. according to the method described in claim 1, include the following steps it is characterized in that, opening up the horizontal well group (10)：Horizontal production well (11) is opened up, horizontal steam injection well (12) is opened up above the horizontal production well (11).
- 3. according to the method described in claim 2, it is characterized in that, first steam is injected in the horizontal well group (10) Include the following steps：First steam is injected in the horizontal steam injection well (12) so that the oil reservoirs form vapor chamber (20).
- 4. according to the method described in claim 3, it is characterized in that, the vapor chamber (20) is formed in the interlayer of the oil reservoirs Between region.
- 5. according to the method described in claim 4, include the following steps it is characterized in that, opening up the straight well (30)：The straight well (30) is opened up in the sandwiched area for forming the vapor chamber (20).
- 6. according to the method described in claim 5, include the following steps it is characterized in that, opening up the straight well (30)：The straight well (30) is opened up in the sandwiched area so that the vapor chamber (20) be formed in the straight well (30) with it is described Between horizontal steam injection well (12).
- 7. according to the method described in claim 4, it is characterized in that, injection second steam includes in the straight well (30) Following steps：Injection second steam in the straight well (30), second steam are sprayed by spray-hole (31) to the interlayer Region, so that the oil body in the sandwiched area is discharged by the horizontal production well (11).
- 8. the method according to the description of claim 7 is characterized in that the spray-hole (31) is positioned at the horizontal production well (11) Top.
- 9. according to the method described in claim 1, it is characterized in that, to open up the straight well (30) further comprising the steps of：The straight well (30) is opened up in the side of the center line of the horizontal well group (10).
- 10. according to the method described in claim 1, it is characterized in that, the straight well (30) is multiple, in each straight well (30) Middle injection second steam.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611256080.2A CN108252698A (en) | 2016-12-29 | 2016-12-29 | Method for producing petroleum |
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| CN201611256080.2A CN108252698A (en) | 2016-12-29 | 2016-12-29 | Method for producing petroleum |
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| CN108252698A true CN108252698A (en) | 2018-07-06 |
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| CN201611256080.2A Pending CN108252698A (en) | 2016-12-29 | 2016-12-29 | Method for producing petroleum |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111364961A (en) * | 2018-12-25 | 2020-07-03 | 中国石油天然气股份有限公司 | Super heavy oil SAGD exploitation method |
| CN112081567A (en) * | 2019-06-12 | 2020-12-15 | 中国石油天然气股份有限公司 | Method for improving SAGD oil production effect |
| WO2025000902A1 (en) * | 2023-06-26 | 2025-01-02 | 中国石油天然气股份有限公司 | Sagd injection-extraction method for deep ultra-heavy oil reservoir |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111364961A (en) * | 2018-12-25 | 2020-07-03 | 中国石油天然气股份有限公司 | Super heavy oil SAGD exploitation method |
| CN112081567A (en) * | 2019-06-12 | 2020-12-15 | 中国石油天然气股份有限公司 | Method for improving SAGD oil production effect |
| WO2025000902A1 (en) * | 2023-06-26 | 2025-01-02 | 中国石油天然气股份有限公司 | Sagd injection-extraction method for deep ultra-heavy oil reservoir |
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