CN107401397B - Communication method of double horizontal wells - Google Patents
Communication method of double horizontal wells Download PDFInfo
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- CN107401397B CN107401397B CN201710799614.4A CN201710799614A CN107401397B CN 107401397 B CN107401397 B CN 107401397B CN 201710799614 A CN201710799614 A CN 201710799614A CN 107401397 B CN107401397 B CN 107401397B
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- 238000000034 method Methods 0.000 title claims abstract description 50
- 238000004891 communication Methods 0.000 title abstract description 8
- 238000010793 Steam injection (oil industry) Methods 0.000 claims abstract description 182
- 238000004519 manufacturing process Methods 0.000 claims abstract description 182
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 124
- 239000002904 solvent Substances 0.000 claims abstract description 67
- 238000002347 injection Methods 0.000 claims abstract description 43
- 239000007924 injection Substances 0.000 claims abstract description 43
- 238000011161 development Methods 0.000 claims abstract description 9
- 230000009977 dual effect Effects 0.000 claims description 67
- 239000003921 oil Substances 0.000 claims description 37
- 239000007789 gas Substances 0.000 claims description 23
- 238000005336 cracking Methods 0.000 claims description 17
- 238000006073 displacement reaction Methods 0.000 claims description 11
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 claims description 9
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 9
- 239000010779 crude oil Substances 0.000 claims description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 claims description 5
- 239000012155 injection solvent Substances 0.000 claims description 5
- 235000020681 well water Nutrition 0.000 claims description 5
- 239000002349 well water Substances 0.000 claims description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 239000002283 diesel fuel Substances 0.000 claims description 3
- 239000011229 interlayer Substances 0.000 claims description 3
- 239000003350 kerosene Substances 0.000 claims description 3
- 239000003208 petroleum Substances 0.000 claims description 3
- 238000010025 steaming Methods 0.000 claims description 3
- 239000008096 xylene Substances 0.000 claims description 3
- 238000001556 precipitation Methods 0.000 claims description 2
- 230000000977 initiatory effect Effects 0.000 claims 1
- 238000012360 testing method Methods 0.000 abstract description 4
- 238000010796 Steam-assisted gravity drainage Methods 0.000 description 14
- 238000010438 heat treatment Methods 0.000 description 13
- 238000012546 transfer Methods 0.000 description 13
- 230000000694 effects Effects 0.000 description 9
- 239000004615 ingredient Substances 0.000 description 9
- 230000008569 process Effects 0.000 description 7
- 208000010392 Bone Fractures Diseases 0.000 description 6
- 206010017076 Fracture Diseases 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 230000008901 benefit Effects 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- 230000007935 neutral effect Effects 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 235000014171 carbonated beverage Nutrition 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000012071 phase Substances 0.000 description 3
- 239000002351 wastewater Substances 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000004904 shortening Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000686 essence Substances 0.000 description 1
- 239000008398 formation water Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 239000011435 rock 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
- E21B43/17—Interconnecting two or more wells by fracturing or otherwise attacking the formation
-
- 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
- E21B43/20—Displacing by water
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)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Earth Drilling (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
Abstract
The invention discloses a communication method of double horizontal wells, which relates to the field of oil and gas development and comprises the following steps: testing a steam injection horizontal well and a production horizontal well; injecting a solvent into the steam injection horizontal well and the production horizontal well respectively; injecting water into the steam injection horizontal well through a shaft of the steam injection horizontal well, and injecting water into the production horizontal well through a shaft of the production horizontal well; continuously injecting water into the steam injection well and the production horizontal well respectively, and improving the water injection pressure of the steam injection horizontal well and the water injection pressure of the production horizontal well; after the steam injection horizontal well and the production horizontal well are closed to meet a first preset condition, gas is respectively injected into the steam injection horizontal well and the production horizontal well so that underground water is drained back to the ground; and after the underground water is drained back to the ground, injecting steam with the same pressure into the steam injection horizontal well and the production horizontal well to meet a second preset condition. The utility model provides a uniform degree of UNICOM between two horizontal wells can effectively be strengthened to this application, shortens the UNICOM time between two horizontal wells, reduces solvent consumption by a wide margin.
Description
Technical field
The present invention relates to oil and gas development field, in particular to a kind of method for communicating of dual horizontal well.
Background technique
Dual horizontal well SAGD develops shallow super heavy oil and achieves success in Canada, and obtains business application, therefore, should
Kind development scheme is also also received in the country, China therewith slowly to be paid attention to.In SAGD startup stage, due to initial temperature of reservoir is low,
Viscosity of crude is big, is difficult to form effective connection between the dual horizontal well well of 5 meters of traditional well spacings, thus has after being heated near steam injection well
Having the viscous crude of fluid ability can not flow downward, and vapor chamber is also unable to get extension, therefore establishes effective fluid communication and seem
It is particularly significant.In addition, the thermal communication between well is also most important, the process of the viscous crude of the top heating slow seepage flow of producing well to the lower part
In can lose heat, cause temperature decline, viscosity to increase, it is difficult so as to cause crude oil flow between well, be unable to complete successfully draining
Process.
Summary of the invention
In order to overcome the drawbacks described above of the prior art, the technical problem to be solved is that provide one kind for the embodiment of the present invention
The method for communicating of dual horizontal well can effectively reinforce the connection uniformity coefficient between dual horizontal well, shorten between dual horizontal well
The connection time.
The specific technical solution of the embodiment of the present invention is:
A kind of method for communicating of dual horizontal well, the dual horizontal well include steam injection horizontal well and production level well, described double
The method for communicating of horizontal well the following steps are included:
The steam injection horizontal well and the production level well are tested main to obtain the minimum of the steam injection horizontal well
Stress, the initial cracking pressure of the steam injection horizontal well, the minimum principal stress of the production level well and the production level well rise
Split pressure；
Solvent is injected to the steam injection horizontal well and the production level well respectively；
It is filled the water by the pit shaft of the steam injection horizontal well into the steam injection horizontal well, passes through the production level well
Pit shaft filled the water into the production level well so that in the pit shaft of the steam injection horizontal well and the production level well
The solvent displacement is into oil reservoir；
Continue to be filled the water to the steam injection well and the production level well respectively, and improves the note of the steam injection horizontal well
Water pressure to the steam injection horizontal well minimum principal stress between the initial cracking pressure of the steam injection horizontal well, the production level
The water injection pressure of well to the production level well minimum principal stress between the initial cracking pressure of the production level well；
It, will be described after forming High water cut region in the steam injection horizontal well and the respective solvent area of the production level well
After steam injection horizontal well and the production level well close the first preset condition of satisfaction, respectively to the steam injection horizontal well and the life
It produces horizontal well injection gas and drains into ground so that mine water returns；
After mine water returns and drains into ground, the steaming of Xiang Suoshu steam injection horizontal well and production level well injection equal pressure
Vapour meets the second preset condition.
In a preferred embodiment, continue to be filled the water to the steam injection well and the production level well respectively,
And the water injection pressure of the steam injection horizontal well is improved to the minimum principal stress of the steam injection horizontal well to the steam injection horizontal well
Between initial cracking pressure, the minimum principal stress of the water injection pressure of the production level well to the production level well to the production water
Between the initial cracking pressure of horizontal well, so that being respectively formed one in the solvent area of the steam injection horizontal well and the production level well
High water cut region centered on pit shaft, and height of the High water cut region of the steam injection horizontal well not with the production level well contains
Water area connection.
In a preferred embodiment, the method for communicating of the dual horizontal well is further comprising the steps of:
Have the water of pressure to judge underground crack to the steam injection horizontal well and production level well injection respectively
Developmental state.
In a preferred embodiment, the method for communicating of the dual horizontal well is further comprising the steps of:
It is recycled respectively to the steam injection horizontal well and production level well water filling to clean wellbore wall surface.
In a preferred embodiment, the method for communicating of the dual horizontal well is further comprising the steps of:
It is filled the water in the pit shaft by the steam injection horizontal well into the steam injection horizontal well, passes through the production
The pit shaft of horizontal well is filled the water into the production level well, so that the well of the steam injection horizontal well and the production level well
Before step of the solvent displacement into oil reservoir in cylinder, respectively by the well of the steam injection horizontal well and the production level well
Injection slug can colloidal sol in cylinder annular space.
In a preferred embodiment, it is provided with first tubing string in the steam injection horizontal well and is longer than first pipe
The second tubing string of column, the production level well is provided with third tubing string and is longer than the 4th tubing string of the third tubing string, described
The steam injection horizontal well and the production level well are closed after meeting the first preset condition, respectively to the steam injection horizontal well and
Production level well injection gas is so that mine water returned in the step of draining into ground, respectively to the steam injection horizontal well and described
Gas is injected in the ring set of production level well, so that the mine water of the steam injection horizontal well is from the first tubing string or described second
Tubing string, which returns, drains into ground, and the mine water of the production level well returns from the third tubing string or the 4th tubing string and drains into ground.
In a preferred embodiment, it is injected into the ring set of the steam injection horizontal well and the production level well
Gas, so that the mine water of the steam injection horizontal well is returned from the first tubing string or the second tubing string drains into ground, the life
The mine water for producing horizontal well returns during draining into ground from the third tubing string or the 4th tubing string, gradually reduces underground pressure
Power drains into ground to promote mine water to return.
In a preferred embodiment, first preset condition is the steam injection horizontal well and the production level
The well shut-in time is more than or equal to 24 hours.
In a preferred embodiment, second preset condition is to the steam injection horizontal well and the production water
The time of the isobaric steam of horizontal well injection is more than or equal to 2 months.
In a preferred embodiment, it is injected respectively to the steam injection horizontal well and the production level well described
Solvent is so that in the step of filling the solvent in the steam injection horizontal well pit shaft and the production level well shaft, in Xiang Suoshu
When filling the solvent in steam injection horizontal well pit shaft and the production level well shaft, it is described molten that injection is adjusted by injection pressure
The flow velocity and pressure of agent.
In a preferred embodiment, the steam injection horizontal well and production level well meet the following conditions: the note
There is no interlayers between well between carbonated drink horizontal well and production level well；Oil reservoir where the steam injection horizontal well and production level well belongs to
Group III oil reservoir；Intrinsic fracture is not present in oil reservoir region where the steam injection horizontal well and production level well；The steam injection horizontal well
Edge-bottom water is not present with oil reservoir region where production level well.
In a preferred embodiment, the solvent can mutually dissolve each other with the viscous crude, and not will cause asphalitine analysis
Out.
In a preferred embodiment, the viscosity of the solvent at room temperature in 1mPa.S between 100mPa.S,
Density is in 0.7g/cm3 between 1.2g/cm3.
In a preferred embodiment, the solvent has the glutinous ability of drop, solvent quality score in reservoir temperature
5000mPaS should be lower than for 20% solvent and the viscosity of blends of crudes.
In a preferred embodiment, the solvent include at least following one: benzene,toluene,xylene, kerosene,
Diesel oil, petroleum ether and light crude oil.
In a preferred embodiment, meet in described close the steam injection horizontal well and the production level well
After first preset condition, drain into ground to the steam injection horizontal well and production level well injection gas so that mine water returns respectively
In the step of face, the gas is nitrogen.
In a preferred embodiment, respectively to the steam injection horizontal well and the production level well injection solvent with
Make to fill the solvent in the steam injection horizontal well pit shaft and the production level well shaft.
Technical solution of the present invention have it is following significant the utility model has the advantages that
The method for communicating of dual horizontal well is by injecting solvent into dual horizontal well in the application, then displacement in flooding solvent and thick
The mixture that oil is formed, and then the High water cut area centered on wellbore is gradually formed, steam is then injected into dual horizontal well again
It is recycled.Since High water cut area expands the radius of line heat source, the heat transfer distances between dual horizontal well are obtained
To declining to a great extent, so that rate of rise in temperature is substantially increased between dual horizontal well well, institute can substantially shorten double water in this way
The connection time of horizontal well substantially mentions to save a large amount of steam in addition, the uniformity of connection is also available between dual horizontal well well
It rises.
Referring to following description and accompanying drawings, only certain exemplary embodiments of this invention is disclosed in detail, specifies original of the invention
Reason can be in a manner of adopted.It should be understood that embodiments of the present invention are not so limited in range.In appended power
In the range of the spirit and terms that benefit requires, embodiments of the present invention include many changes, modifications and are equal.For a kind of reality
The feature that the mode of applying is described and/or shown can be made in one or more other embodiments in a manner of same or similar
With, be combined with the feature in other embodiment, or substitution other embodiment in feature.
Detailed description of the invention
Attached drawing described here is only used for task of explanation, and is not intended to limit model disclosed by the invention in any way
It encloses.In addition, shape and proportional sizes of each component in figure etc. are only schematical, it is used to help the understanding of the present invention, and
It is not the specific shape and proportional sizes for limiting each component of the present invention.Those skilled in the art under the teachings of the present invention, can
Implement the present invention to select various possible shapes and proportional sizes as the case may be.
Fig. 1 is the sectional view under routine SAGD production along horizontal well direction.
Fig. 2 is the temperature field schematic diagram between routine SAGD production is gone into the well under 5 meters of double heat source unsteady-state heat transfers.
Fig. 3 is that the conventional double heat sources of steam injected cycle thermal communication fly Heat Conduction schematic diagram.
Fig. 4 is the step schematic diagram of the method for communicating of dual horizontal well in the embodiment of the present application.
Fig. 5 is the fingering effect picture that formation is filled the water after infusing solvent in the embodiment of the present application.
Fig. 6 is that steam circulation dual horizontal well neutral temperature is at any time under the conditions of different heating radius in the embodiment of the present application
Variation relation figure.
The appended drawing reference of the figures above:
1, steam injection horizontal well；11, first tubing string；12, second tubing string；2, production level well；21, third tubing string；22, the 4th
Tubing string；3, dual horizontal well center line.
Specific embodiment
With reference to the drawings and the description of the specific embodiments of the present invention, details of the invention can clearly be understood.But
It is the specific embodiment of invention described herein, purpose for explaining only the invention, and cannot understand in any way
At being limitation of the present invention.Under the teachings of the present invention, technical staff is contemplated that based on any possible change of the invention
Shape, these are regarded as belonging to the scope of the present invention.It should be noted that when element is referred to as " being set to " another yuan
Part, it can directly on the other element or there may also be elements placed in the middle.When an element is considered as " connection "
Another element, it can be directly to another element or may be simultaneously present centering elements.Term " installation ",
" connected ", " connection " shall be understood in a broad sense, for example, it may be mechanical connection or electrical connection, are also possible to inside two elements
Connection, can be directly connected, can also indirectly connected through an intermediary, for the ordinary skill in the art,
The concrete meaning of above-mentioned term can be understood as the case may be.Term as used herein " vertical ", " horizontal ",
"upper", "lower", "left", "right" and similar statement for illustrative purposes only, are not meant to be the only embodiment.
Unless otherwise defined, all technical and scientific terms used herein and the technical field for belonging to the application
The normally understood meaning of technical staff is identical.The term used in the description of the present application is intended merely to description tool herein
The purpose of the embodiment of body, it is not intended that in limitation the application.Term as used herein "and/or" includes one or more
Any and all combinations of relevant listed item.
Fig. 1 is the sectional view under routine SAGD production along horizontal well direction, as shown in Figure 1, the operating technology of mainstream at present
It is the arrangement double tube tubular column structure in top steam injection well and lower part producing well, while pressure injections is carried out etc. to gas injection well and producing well
Then steam circulation preheating relies on temperature difference in the form of heat transfer to reservoir to form stable high-temperature region near wellbore
Deep heat transfer, thus the oil reservoir between being slowly heated injection-production well.Double heat source unstable state that Fig. 2 is 5 meters between routine SAGD production is gone into the well
Temperature field schematic diagram under heat transfer, Fig. 3 are that the conventional double heat sources of steam injected cycle thermal communication fly Heat Conduction schematic diagram, such as Fig. 2
With shown in Fig. 3, from thermal conduction study angle analysis, the above method has following intrinsic drawback: 1, steam injection horizontal well 1 and production level well
There are low temperature bottle-neck zone, the low temperature bottle-neck zones to be easy to cause later period steam injection horizontal well 1 and production level well for 2 middle sections region
Connection is uneven between 2；2, the heat transfer below producing well will form invalid heating zone, and efficiency of heating- utilization is not high；3, fixed double
Heat source heat transfer is slow, and energy consumption is high；4, it needs kill-job to cool down when turning SAGD and repairing pump, thus will cause a large amount of heat-energy losses in well.
For the horizontal well of 350 meters or so buried depths, injecting vapor (steam) temperature is about 260 degrees Celsius, pressure 4.5MPa, water
The length of horizontal well is 400 meters or so, naked eye diameter is 7 cun or so, and injection steam flow is about 70M3/d.Current main heat
Source is the steam boiler using natural gas, and by this flow rate calculation, the gas cost of odd-numbered day individual well group is i.e. more than a Wan Yuan.It is logical
Often, circulation warm at least needs to ensure for lasting 4 months or so effective connection between well, so as to be transferred to normal SAGD
Production phase.However, will appear the influence of many unfavorable factors during connection between well, as oil reservoir water saturation is high, heat
Physical property is poor, wellbore trace controls bad, buried depth compared with deep, oil reservoir is thin, injection steam quality is low, underground heating is unequal, it is above-mentioned because
Element may cause that circulation pre-heat effect is poor, time-consuming, when serious or even may require that nearly 1 year or so circulation preheating time, such as
Overall oil-gas ratio, business efficiency that this SAGD is developed etc. will receive large effect.In addition, in SAGD startup stage, if
Previous circulation pre-heat effect is poor to frequently can lead to after turning SAGD that horizontal well development degree is low, and scheme is not achieved in oil production rate
The expection rate of design, the effect even if then taking measures to improve horizontal well development degree subsequent, after improving
Also extremely limited, thus the connection effect between initial start stage well is in poor state will seriously affect the development effectiveness of SAGD.
In order to effectively reinforce the connection effect between dual horizontal well, shorten the connection time between dual horizontal well, In
A kind of method for communicating of dual horizontal well is proposed in the application, dual horizontal well includes steam injection horizontal well 1 and production level well 2, note
It can be set first tubing string 11 and the second tubing string 12 for being longer than first tubing string 11 in carbonated drink horizontal well 1, it can be in production level well 2
It is provided with third tubing string 21 and is longer than the 4th tubing string 22 of third tubing string 21, be between steam injection horizontal well 1 and production level well 2
Dual horizontal well center line 3, meanwhile, steam injection horizontal well 1 and production level well 2 meet the following conditions: steam injection horizontal well 1 and production water
There is no interlayers between well between horizontal well 2；Steam injection horizontal well 1 and 2 place oil reservoir of production level well belong to Group III oil reservoir；Steam injection water
Intrinsic fracture is not present in horizontal well 1 and 2 place oil reservoir region of production level well；2 place oil reservoir of steam injection horizontal well 1 and production level well
Edge-bottom water is not present in region.Of course, when implementing the method in the application to steam injection horizontal well 1 and production level well 2, it should
It is obtained in advance about the detecting earth stress data of 2 place block adjacent well of above-mentioned steam injection horizontal well 1 and production level well and other
Related data, such as reservoir and crude oil property parameter such as porosity, permeability, formation water salinity, oil saturation, crude oil are glutinous
Degree etc., to provide corresponding data support to implement this method, Fig. 4 is the method for communicating of dual horizontal well in the embodiment of the present application
Step schematic diagram, the method for communicating of dual horizontal well the following steps are included:
S101: there is the water of pressure to judge the hair in underground crack to steam injection horizontal well 1 and the injection of production level well 2 respectively
Educate situation.It in this step, can be by having the water of pressure to sentence to steam injection horizontal well 1 and the injection of production level well 2 respectively
Situations such as disconnected underground whether there is the state of intrinsic fracture, underground fracture development.If having understood above-mentioned steam injection horizontal well 1 and life
Producing information, this step such as intrinsic fracture, the underground fracture development state of 2 underground of horizontal well can be omitted.
S102: it is recycled respectively to steam injection horizontal well 1 and the water filling of production level well 2 to clean wellbore wall surface.In this step
In rapid, it can be filled the water to the pit shaft or first tubing string 11 or second tubing string 12 of steam injection horizontal well 1, with the well to steam injection horizontal well 1
The mud of the wall surface of eye is cleaned, and the waste water after cleaning can be from corresponding pit shaft or first tubing string 11 or second tubing string 12
It returns and drains into ground.For example, filled the water to the pit shaft of steam injection horizontal well 1, then can from the waste water after cleaning can with first tubing string 11 or
Second tubing string 12, which is returned, drains into ground.It similarly, can be to 22 note of pit shaft or third tubing string 21 or the 4th tubing string of production level well 2
Water is cleaned with the mud of the wall surface of the wellbore to production level well 2, the waste water after cleaning can from corresponding pit shaft or
Third tubing string 21 or the 4th tubing string 22 return and drain into ground.If the wellbore wall surface of steam injection horizontal well 1 and production level well 2 satisfaction is wanted
It asks, then can not implement this step.
S103: steam injection horizontal well 1 and production level well 2 are tested with obtain the minimum principal stress of steam injection horizontal well 1,
The initial cracking pressure of the initial cracking pressure of steam injection horizontal well 1, the minimum principal stress of production level well 2 and production level well 2.Usually and
Speech, the test can be minute-pressure and split test.
S104: solvent is injected so that 1 pit shaft of steam injection horizontal well and production to steam injection horizontal well 1 and production level well 2 respectively
Solvent is injected in 2 pit shaft of horizontal well.In this step, injected into 2 pit shaft of 1 pit shaft of steam injection horizontal well and production level well it is molten
When agent, the flow velocity and down-hole pressure of injection solvent can be adjusted by injection pressure.When down-hole pressure rises to minimum principal stress
When reduce injection solvent flow velocity, i.e., reduction injection pressure；Injection solvent can be properly increased when down-hole pressure continues to decline
Flow velocity, the high injection pressure of bank run.Meanwhile the gas of underground can be first emptied, then as far as possible with prestissimo by steam injection water
The pit shaft of horizontal well 1 and production level well 2 is filled completely.
In the present embodiment, the type of solvent can be diversified, can be and is made of one-component, can be with
Be also mixture, need to only meet the following conditions: solvent can mutually dissolve each other with viscous crude, and not will cause asphalitine precipitation；It is molten
The viscosity of agent at room temperature is in 1mPa.S between 100mPa.S, and density is in 0.7g/cm3To between 1.2g/cm3；Solvent is in oil
Hiding temperature has the ability of sticking that drops, and the viscosity of solvent and blends of crudes that solvent quality score is 20% should be lower than
5000mPaS.Solvent it is subsequent inject steam to steam injection horizontal well 1 and production level well 2 when, influenced by high-temperature steam, can
It can also be in gas phase to be in liquid phase.For example, solvent at least may include following one: benzene,toluene,xylene, kerosene, diesel oil,
Petroleum ether and light crude oil etc..
The injection rate for injecting solvent to steam injection horizontal well 1 and production level well 2 is different according to the difference two of type of solvent.One
As for 400 meters or so of injection rate for forming the horizontal well for the purpose of wellbore is the solvent chamber that center of circle radius is 1 meter, most
Good injection rate is between 78 cubic metres to 144 cubic metres.
After filling solvent in 2 pit shaft of 1 pit shaft of steam injection horizontal well and production level well, after solvent carrying well inner part drop is glutinous
Viscous crude along the depths radially into reservoir of well, to will form a column solvent area centered on wellbore.
S105: respectively by the mineshaft annulus of steam injection horizontal well 1 and production level well 2 inject slug can colloidal sol.In order to
It can be separated at intervals in the later period to the solvent that steam injection horizontal well 1 and the injection of production level well 2 water energy inject water with before, shape
At displacement process, since the density of organic solvent is lower than water, the solvable of injection slug can be injected into mineshaft annulus at this moment
Solvent in pit shaft can be pressed into stratum by glue as far as possible later in this way.This can colloidal sol can dissolve at high temperature, because
This is influenced when injecting steam to steam injection horizontal well 1 and production level well 2 in the later period by after steam heating, this can colloidal sol be
It can dissolve, so that it be avoided to influence fluid communication and thermal communication between steam injection horizontal well 1 and production level well 2.
S106: it is filled the water by the pit shaft of steam injection horizontal well 1 into steam injection horizontal well 1, passes through the well of production level well 2
Cylinder is filled the water into production level well 2, so that the solvent displacement in the pit shaft of steam injection horizontal well 1 and production level well 2 is to oil
In layer.In this step, it can be filled the water by pit shaft to steam injection horizontal well 1 and production level well 2, the water of injection will be original
The equal displacement of solvent of steam injection horizontal well 1 and 2 pit shaft vertical section of production level well and horizontal segment is into oil reservoir.
S107: continue to be filled the water to steam injection well 1 and production level well 2 respectively, and improve the water filling pressure of steam injection horizontal well 1
Power to steam injection horizontal well 1 minimum principal stress between the initial cracking pressure of steam injection horizontal well 1, the water injection pressure of production level well 2
To production level well 2 minimum principal stress between the initial cracking pressure of production level well 2.
In this step, continue to fill the water steam injection horizontal well 1 and production level, and improve water injection pressure, by steam injection
The water injection pressure of horizontal well 1 is increased to the minimum principal stress of steam injection horizontal well 1 between the initial cracking pressure of steam injection horizontal well 1, such as
This, so that the moveable oil in the solvent area of steam injection horizontal well 1 is replaced by water drive to the deeper inside of oil reservoir, in this way, steam injection horizontal well 1
In solvent area and it is formed about a High water cut region centered on pit shaft.Similarly, the water injection pressure of production level well 2 is mentioned
Height to production level well 2 minimum principal stress between the initial cracking pressure of production level well 2, in this way, making production level well 2
Moveable oil in solvent area is replaced by water drive to the deeper inside of oil reservoir, in the solvent area of production level well 2 be formed about one with
High water cut region centered on pit shaft, meanwhile, the High water cut region of steam injection horizontal well 1 not with the High water cut area of production level well 2
Domain connection.Fig. 5 is the fingering effect picture that formation is filled the water after infusing solvent in the embodiment of the present application, as shown in figure 5, the circle of two black
Steam injection horizontal well 1 and production level well 2 respectively are successively respectively as follows: wellbore (circle of black) since the circle of black, with well outward
High water cut area, solvent effect area, the original reservoir centered on eye.The part crude oil of near wellbore zone can be dropped by this step
It is viscous, and with water by its displacement to stratum depths, in the zone of saturation of near wellbore zone formation High water cut after water displacement crude oil, utilize this
Following purpose may be implemented in the zone of saturation of High water cut: 1, mainly with thermal convection heat transfer modes, heat transfer in High water cut zone of saturation
It is high-efficient, it is equivalent to and increases the diameter of horizontal hole, shorten the distance conducted heat between inefficient well, when so as to shorten steam circulation
Between, accelerate connection process, while saving steam consumption.2, due to each idiomorphism centered on steam injection horizontal well 1 and production level well 2
At the incomplete connection in High water cut zone of saturation, avoid follow-up steam circulation when Local Priority be connected, lead to part of horizontal
Section section temperature is promoted obviously, and part of horizontal section can not effectively be heated, i.e. the non-uniform problem of dual horizontal well connection.
S108: after forming High water cut region in the steam injection horizontal well and the respective solvent area of the production level well,
Steam injection horizontal well 1 and production level well 2 are closed after meeting the first preset condition, respectively to steam injection horizontal well 1 and production level
Well 2 injects gas and drains into ground so that mine water returns.In this step, first steam injection horizontal well 1 and production level well 2 are closed full
The first preset condition of foot, the first preset condition is a time span, under the time span, steam injection horizontal well 1 and production water
In the solvent area of horizontal well 2 and it can nearby form a relatively stable High water cut region.In general, the first preset condition is
Steam injection horizontal well 1 and 2 shut-in time of production level well are more than or equal to 24 hours.Then again respectively to steam injection horizontal well 1 and production
Horizontal well 2 injects gas and drains into ground so that mine water returns, and gas can be the safe gas not soluble in water that can pour underground,
For example, nitrogen.In a kind of feasible embodiment, gas is injected into the ring set of steam injection horizontal well 1 and production level well 2 respectively
Body, so that the mine water of steam injection horizontal well 1 is returned from first tubing string 11 or second tubing string 12 drains into ground, the well of production level well 2
It is lauched from third tubing string 21 or the 4th tubing string 22 and returns and drain into ground.In above process, down-hole pressure can be gradually reduced to promote
It is returned into mine water and drains into ground, so that underground high specific heat capacity fluid-water content is reduced, in favor of fast lifting near wellbore zone
Temperature, more efficient utilizes latent heat of the steam in next step.
S109: after mine water returns and drains into ground, the steaming of equal pressure is injected to steam injection horizontal well 1 and production level well 2
Vapour meets the second preset condition.In this step, steam can be injected into the second tubing string 12 of steam injection horizontal well 1, passes through note
The first tubing string 11 of carbonated drink horizontal well 1 returns liquid circulation, similarly, can inject steam into the 4th tubing string 22 of production level well 2, leads to
The third tubing string 21 for crossing production level well 2 returns liquid circulation.Due in the solvent area of steam injection horizontal well 1 and production level well 2 and attached
A High water cut region is closely formed, due to moveable water convective heat transfer, rate of rise in temperature is very fast in the High water cut region, is injecting
Steam phase, temperature can rise towards saturated-steam temperature, accordingly, with respect to originally equal to horizontal well wellbore radius length
Effective heating radius, effective heating radius at this time expanded.That is, the radius of the line heat source of script is level
Well wellbore radius length, the radius of present line heat source are the radius length for being slightly less than the High water cut region, and line heat source radius obtains
Effective expansion is arrived.When injecting isobaric steam to steam injection horizontal well 1 and production level well 2 with to heating between well,
Because of the increase of the line heat source radius of steam injection horizontal well 1 and production level well 2, cause steam injection horizontal well 1 and production level well 2 it
Between heat transfer distances decline, therefore, during heating between well temperature rise speed can be substantially increased, so in well spacing
Under the premise of constant, not only available effective connection between two wells, and the time of connection has obtained substantially contracting between two wells
It is short, it is however generally that, the second preset condition be time of isobaric steam is injected to steam injection horizontal well 1 and production level well 2 can be with
It foreshortens to 2 months or two months or more.The shortening of the time of connection can save a large amount of injection steam between two wells, subtract significantly
Small connection cost.This method can to obtain effective connection between two wells, therefore, can reduce the track to well-drilling borehole
It is required that the degree that horizontal segment is uniformly employed when improving oil reservoir exploitation, gives full play to the advantage of horizontal well gravity drainage.Fig. 6 is this
Steam circulation dual horizontal well neutral temperature changes with time relational graph under the conditions of different heating radius in application embodiment, such as schemes
Shown in 6, in one embodiment, steam injection temperature is 250 degrees Celsius, and steam injection flow is 75 cubic metres/day, and calculating wellbore has
The temperature at the midpoint between dual horizontal well when radius is respectively 0.11 meter and 1.11 meters is imitated with the pass of steam circulation preheating time
System is calculated according to the big unsteady-state heat transfer model of two-wire heat source semo-infinite.Wherein 0.11m can be the radius of horizontal hole,
The High water cut area that the radius that 1.11m is formed after can filling the water again for first note solvent is 1.11m, in steam cycle process,
Being equivalent to wellbore increasing radius is 1.11m.The neutral temperature calculated by different heating radius (line heat source radius) is at any time
After relationship is it is found that be increased to 1.11m for radius, it is only necessary to 30 days can be by midpoint between well when ideal wellbore trace (i.e. be 2.5m)
It is increased to 100 DEG C or more.And the heating radius (line heat source radius) in conventional method only has 0.11m, and neutral temperature between well is mentioned
The steam cycle time that height is needed to 100 DEG C more than 100 days.Thus comparison is it is found that heating radius (line heat source radius) is increased
Afterwards, the rate that temperature rises between well is substantially improved, and reaches crude oil and has the steam injection time required for fluid ability and also just substantially contracts
Short, from the point of view of in the present embodiment, the steam injection time is about the 1/3 of conventional scheme.Since the steam injection time greatly shortens, can save
A large amount of steam cost is saved, while it is also possible that the cost of water process declines to a great extent, so the program has preferable economy
Benefit.
The following are the method for communicating of the dual horizontal well in the application to apply the embodiment in a certain specific oil reservoir.
The heavy crude reservoir that the oil reservoir is 440 meters of buried depth, 50 DEG C of degassed crude viscositys are 106000mPa.S, the hole of oil reservoir
Degree is 30%, and permeability is 1.4 darcies, oil saturation 85%, reservoir thickness 25m.The minimum that on-the-spot test obtains is main
Stress is 6.3MPa, initial cracking pressure 8.5MPa.A length of 400 meters of the dual horizontal well horizontal segment being arranged in oil reservoir, borehole diameter is
8.5in, the well spacing of dual horizontal well are 5 meters, and horizontal production well is located above bottom substrate rock at 1 meter.Dual horizontal well is respectively infused
Entering 80 cubic metres of dimethylbenzene, subsequent dual horizontal well respectively fills the water 117 cubic metres, and totally 5 days, then injected from the respective ring set of dual horizontal well
Nitrogen is discharged in the tubing string of Cong Jingzhong, gradually by ring set pressure reduction, is finally injected from long tube respective in dual horizontal well note
Steam returns liquid circulation, steam injection pressure 4MPa, 75 cubic metre/day of underground steam flow, well head steam quality in short string
95%, circulation judged that connection is good between dual horizontal well after 2 months, and effective use rate of dual horizontal well horizontal segment reaches 90%,
Normal SAGD production is gone to after turning half SAGD transition.Relative to neighbouring other well groups using conventional method, preheating time is recycled
Shorten nearly 10 months.
The method for communicating of dual horizontal well is by injecting solvent into dual horizontal well in the application, then displacement in flooding solvent and thick
The mixture that oil is formed, and then the High water cut area centered on wellbore is gradually formed, steam is then injected into dual horizontal well again
It is recycled.Since High water cut area expands the radius of line heat source, the heat transfer distances between dual horizontal well obtain
To declining to a great extent, so that rate of rise in temperature is substantially increased between dual horizontal well well, so the method in the application can be substantially
The connection time for shortening dual horizontal well, to save a large amount of steam, in addition, by between this method dual horizontal well well connection it is uniform
Property is also available to be substantially improved.
All articles and reference disclosed, including patent application and publication, for various purposes by quoting knot
Together in this.Describing combined term " substantially by ... constitute " should include identified element, ingredient, component or step and reality
Other elements, ingredient, component or the step of the basic novel feature of the combination are not influenced in matter.Using term "comprising" or
" comprising " describes the combination of element here, ingredient, component or step it is also contemplated that substantially by these elements, ingredient, component
Or the embodiment that step is constituted.Here by using term " can with ", it is intended to illustrate that " can with " includes described any
Attribute is all optional.Multiple element, ingredient, component or step can be mentioned by single integrated component, ingredient, component or step
For.Alternatively, single integrated component, ingredient, component or step can be divided into multiple element, ingredient, component or the step of separation
Suddenly.For describe the open "a" or "an" of element, ingredient, component or step do not say in order to exclude other elements, at
Point, component or step.
All the embodiments in this specification are described in a progressive manner, the highlights of each of the examples are with
The difference of other embodiments, the same or similar parts between the embodiments can be referred to each other.Above-described embodiment is only
Illustrate technical concepts and features of the invention, its object is to those skilled in the art can understand the contents of the present invention
And implement accordingly, it is not intended to limit the scope of the present invention.Equivalence changes made by all Spirit Essences according to the present invention
Or modification, it should be covered by the protection scope of the present invention.
Claims (15)
1. a kind of method for communicating of dual horizontal well, the dual horizontal well include steam injection horizontal well and production level well, feature exists
In, the dual horizontal well method for communicating the following steps are included:
The steam injection horizontal well and the production level well are tested with obtain the minimum principal stress of the steam injection horizontal well,
The crack initiation pressure of the initial cracking pressure of the steam injection horizontal well, the minimum principal stress of the production level well and the production level well
Power；
Solvent is injected to the steam injection horizontal well and the production level well respectively；
It is filled the water by the pit shaft of the steam injection horizontal well into the steam injection horizontal well, passes through the well of the production level well
Cylinder is filled the water into the production level well, so that described in the pit shaft of the steam injection horizontal well and the production level well
Solvent displacement is into oil reservoir；
Continue to be filled the water to the steam injection horizontal well and the production level well respectively, and improves the note of the steam injection horizontal well
Water pressure to the steam injection horizontal well minimum principal stress between the initial cracking pressure of the steam injection horizontal well, the production level
The water injection pressure of well to the production level well minimum principal stress between the initial cracking pressure of the production level well；
After forming High water cut region in the steam injection horizontal well and the respective solvent area of the production level well, by the steam injection
After horizontal well and the production level well close the first preset condition of satisfaction, respectively to the steam injection horizontal well and the production water
Horizontal well injects gas and drains into ground so that mine water returns, and first preset condition is the steam injection horizontal well and the production water
The horizontal well shut-in time is more than or equal to 24 hours；
After mine water returns and drains into ground, the steam of Xiang Suoshu steam injection horizontal well and production level well injection equal pressure is full
The second preset condition of foot, second preset condition are the steaming isobaric to the steam injection horizontal well and production level well injection
The time of vapour is more than or equal to 2 months.
2. the method for communicating of dual horizontal well according to claim 1, which is characterized in that continue respectively to the steam injection well and
The production level well is filled the water, and the minimum for improving water injection pressure to the steam injection horizontal well of the steam injection horizontal well is main
Stress between the initial cracking pressure of the steam injection horizontal well, the water injection pressure of the production level well to the production level well
Minimum principal stress is between the initial cracking pressure of the production level well, so that the steam injection horizontal well and the production level well
Solvent area in be respectively formed a High water cut region centered on pit shaft, and the High water cut region of the steam injection horizontal well is not
With the High water cut regional connectivity of the production level well.
3. the method for communicating of dual horizontal well according to claim 1, which is characterized in that the method for communicating of the dual horizontal well
It is further comprising the steps of:
There is the water of pressure to judge the development in underground crack to the steam injection horizontal well and production level well injection respectively
Situation.
4. the method for communicating of dual horizontal well according to claim 1, which is characterized in that the method for communicating of the dual horizontal well
It is further comprising the steps of:
It is recycled respectively to the steam injection horizontal well and production level well water filling to clean wellbore wall surface.
5. the method for communicating of dual horizontal well according to claim 1, which is characterized in that the method for communicating of the dual horizontal well
It is further comprising the steps of:
It is filled the water in the pit shaft by the steam injection horizontal well into the steam injection horizontal well, passes through the production level
The pit shaft of well is filled the water into the production level well, so that in the pit shaft of the steam injection horizontal well and the production level well
Step of the solvent displacement into oil reservoir before, respectively by the pit shaft ring of the steam injection horizontal well and the production level well
Aerial injection slug can colloidal sol.
6. the method for communicating of dual horizontal well according to claim 1, which is characterized in that be provided in the steam injection horizontal well
First tubing string and the second tubing string for being longer than the first tubing string, the production level well are provided with third tubing string and are longer than described the
4th tubing string of three tubing strings meets the first preset condition in described close the steam injection horizontal well and the production level well
Afterwards, respectively to the steam injection horizontal well and production level well injection gas so that mine water returned in the step of draining into ground,
Gas is injected into the ring set of the steam injection horizontal well and the production level well respectively, so that the underground of the steam injection horizontal well
Water returns from the first tubing string or the second tubing string and drains into ground, and the mine water of the production level well is from the third tubing string
Or the 4th tubing string returns and drains into ground.
7. the method for communicating of dual horizontal well according to claim 6, which is characterized in that the steam injection horizontal well and institute
It states in the ring set of production level well and injects gas, so that the mine water of the steam injection horizontal well is from the first tubing string or described
Two tubing strings, which return, drains into ground, and the mine water of the production level well returns from the third tubing string or the 4th tubing string and drains into ground
During, down-hole pressure is gradually reduced to promote mine water to return and drain into ground.
8. the method for communicating of dual horizontal well according to claim 1, which is characterized in that described respectively to the steam injection water
Horizontal well and production level well injection solvent in the steam injection horizontal well pit shaft and the production level well shaft so as to fill
In the step of solvent, when filling the solvent into the steam injection horizontal well pit shaft and the production level well shaft,
The flow velocity and pressure for injecting the solvent are adjusted by injection pressure.
9. the method for communicating of dual horizontal well according to claim 1, which is characterized in that the steam injection horizontal well and production water
Horizontal well meets the following conditions: there is no interlayers between well between the steam injection horizontal well and production level well；The steam injection horizontal well
Belong to Group III oil reservoir with oil reservoir where production level well；Oil reservoir region where the steam injection horizontal well and production level well is not deposited
In intrinsic fracture；Edge-bottom water is not present in oil reservoir region where the steam injection horizontal well and production level well.
10. the method for communicating of dual horizontal well according to claim 1, which is characterized in that the solvent can be mutual with viscous crude
It is molten, and not will cause asphalitine precipitation.
11. the method for communicating of dual horizontal well according to claim 1, which is characterized in that the solvent at room temperature glutinous
Degree is in 1mPa.S between 100mPa.S, and density is in 0.7g/cm3To 1.2g/cm3Between.
12. the method for communicating of dual horizontal well according to claim 1, which is characterized in that the solvent exists in reservoir temperature
With glutinous ability is dropped, the viscosity of solvent and blends of crudes that solvent quality score is 20% should be lower than 5000mPaS.
13. the method for communicating of dual horizontal well according to claim 1, which is characterized in that the solvent includes at least following
One of: benzene,toluene,xylene, kerosene, diesel oil, petroleum ether and light crude oil.
14. the method for communicating of dual horizontal well according to claim 1, which is characterized in that described that the steam injection is horizontal
After well and the production level well close the first preset condition of satisfaction, respectively to the steam injection horizontal well and the production level well
Gas is injected so that mine water returned in the step of draining into ground, and the gas is nitrogen.
15. the method for communicating of dual horizontal well according to claim 1, which is characterized in that respectively to the steam injection horizontal well
Solvent is injected with the production level well so as to fill in the steam injection horizontal well pit shaft and the production level well shaft described
Solvent.
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| CN109138976B (en) * | 2018-07-23 | 2022-01-04 | 中国石油天然气股份有限公司 | Method for judging time for converting double-horizontal-well preheating into SAGD (steam assisted gravity drainage) and double-horizontal-well preheating device |
| CN112727421B (en) * | 2019-10-14 | 2022-10-04 | 中国石油天然气股份有限公司 | Method for increasing connection length of SAGD horizontal sections of double horizontal wells |
| CN113356824A (en) * | 2021-07-01 | 2021-09-07 | 山西蓝焰煤层气工程研究有限责任公司 | Integral development method for adjacent coal seam horizontal well in multi-coal seam development area |
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| CA3012371C (en) | 2020-09-22 |
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