CN109057768A - Recovery method suitable for thin interbed native soda deposit - Google Patents
Recovery method suitable for thin interbed native soda deposit Download PDFInfo
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- CN109057768A CN109057768A CN201810868010.5A CN201810868010A CN109057768A CN 109057768 A CN109057768 A CN 109057768A CN 201810868010 A CN201810868010 A CN 201810868010A CN 109057768 A CN109057768 A CN 109057768A
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- 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
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- 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
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- 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
- E21B43/285—Melting minerals, e.g. sulfur
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Abstract
The invention discloses a kind of recovery methods suitable for thin interbed native soda deposit, comprising the following steps: S1: selecting at least two head away from earth's surface different depth to adopt layer and the water-soluble back production unit of design according to the seam thickness of thin interbed natural alkali mine and integrity degree；S2: adopting layer arrangement at least two straight wells arranged in a straight line in most deep head, and all straight wells both pass through all head and adopt layer, and to all straight well water flooding recoveries, build molten chamber；Multi-branched horizontal well is built on the same plane of all straight wells in S3:S2, the multi-branched horizontal well is arranged in a linear with all straight wells, multi-branched horizontal well is adopted layer along the head of different depth respectively and is connected to all straight wells, all straight wells are made to adopt layer and multi-branched horizontal well one water-soluble back production unit of formation in each head by packing, perforation, being docked and connected for multiple wells can be achieved, and different head is exploited simultaneously and adopts layer, increase the contact area with ore bed, the halogen concentration out that later period note is adopted is greatly improved, to improve the resource recovery ratio of ore bed.
Description
Technical field
The present invention relates to trona drilling and production technology field, especially a kind of brill that the multilayer of thin interbed native soda deposit is adopted altogether
Well solution mining method.
Background technique
Trona is a kind of evaporite mineral, is aqueous sodium bicarbonate.It is mainly used for processing soda ash, caustic soda, sodium bicarbonate, bubble
Flower alkali, akali sulphide etc., be widely used in chemical industry, building materials, light industry, metallurgy, petroleum, weaving, medicine, fire-fighting, animal husbandry, glass,
The industrial departments such as food.Daily life makes food and washing common alkali, and alkali is important basic chemical raw materials in industrial production.
Horizontal well docking drilling solution mining is exploitation the most frequently used and effective method of natural alkali mine.This method is using naturally
Alkali soluble orients docking drilling technology means in the water the characteristics of, through horizontal well, forms the channel of earth's surface and mineral reserve, then fills the water molten
Solution, forms it into the high-concentrated brine rich in trona, then be drawn to ground and processed.
Thin interbed alkali mine is the complicated ore bed that a kind of interlayer is more, ore bed is thin, and most low seam is less than 1m.Using conventional level
Well docks the such ore bed of drilling solution mining, and there are two major defects: 1) ore bed is relatively thin, and trajectory of horizontal is easy to deviate ore bed,
It is difficult to effectively bore and meets ore bed, alkali bittern concentration is low, and ore bed resource utilization is low so that being formed by；2) such ore bed can adopt layer
It is thin, interlayer is more, one head of exploitation is only capable of using conventional straight well-horizontal well well spacing combination and adopts layer, is adopted to exploit other head
Layer, must establish more well groups to exploit other head and adopt layer, not only take considerable time and engineering cost, but also occupy more soil
Ground resource.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of recovery methods suitable for thin interbed native soda deposit, can
Make more mouthfuls of halogen wells while being docked and connected, compared with conventional straight well-horizontal well well group is docked and connected, reduces and optimize total well group cloth
It sets, saves duration of a project and land resource.
The technical scheme adopted by the invention is that: suitable for the recovery method of thin interbed native soda deposit, including following step
It is rapid:
S1: at least two head away from earth's surface different depth are selected according to the seam thickness of thin interbed natural alkali mine and integrity degree
Adopt layer and the water-soluble back production unit of design；
S2: adopting layer arrangement at least two straight wells arranged in a straight line, all straight wells in most deep head and both pass through all head and adopt layer,
And to all straight well water flooding recoveries, build molten chamber；
Multi-branched horizontal well is built on the same plane of all straight wells in S3:S2, the multi-branched horizontal well and all straight wells
It is arranged in a linear, multi-branched horizontal well is adopted layer along the head of different depth respectively and is connected to all straight wells, makes institute by packing, perforation
There is straight well to adopt layer and multi-branched horizontal well in each head and form a water-soluble back production unit, it can be achieved that multiple wells are docked and connected,
And exploit different head simultaneously and adopt layer, it adopts to establish on layer in different head and adopts defeated channel, effectively improve brill and meet ore bed length, increase
Contact area with ore bed, greatly improve that later period note adopts goes out halogen concentration, thus improve the resource recovery ratio of ore bed, while
Total well group arrangement is reduced and optimized, duration of a project and land resource are saved.
Further, select three head to adopt layer according to the seam thickness of thin interbed natural alkali mine and integrity degree in S1, by away from
The depth of earth's surface is followed successively by I alkali layer, II alkali layer and III alkali layer from shallow to deep；
In III alkali layer arrangement straight well B in S21With straight well B2, straight well B1With straight well B2Both pass through I alkali layer, II alkali layer；
Multi-branched horizontal well includes straight well section in S3, further includes the level for being separately positioned on I alkali layer, II alkali layer and III alkali layer
Section I, horizontal segment II and horizontal segment III, horizontal segment I, horizontal segment II and horizontal segment III and straight well B1With straight well B2Pass through third respectively
Branch, the second branch, the connection of the first branch, in which:
First branch and straight well B1With straight well B2Connection: first by the first branch along III alkali layer and straight well B1With straight well B2's
Molten chamber docking, then closes the inclination section of the first branch, makes straight well B1, straight well B2Molten chamber form docking, and to straight well B1With it is straight
Well B2Central tube I, central tube II are each led into, central tube I, horizontal segment I, central tube II form a water-soluble back production unit and complete
The exploitation of III alkali layer；
Second branch and straight well B1With straight well B2Connection: closing the first branch inclination section after, first by the second branch along II
Alkali layer and straight well B1With straight well B2Docking, then closes the inclination section of the second branch, makes straight well B by perforation1With straight well B2It is right
It connects, closes the straight well B below II alkali layer1, straight well B1, horizontal segment II, straight well B2It forms a water-soluble back production unit and completes II alkali layer
Exploitation；
The Single well convection of third branch is exploited: due to the first branch and the second branch occupy respectively straight well central tube and
The note of annular space adopts channel, and third branch can only be exploited using Single well convection.Specific construction are as follows: the inclination section of the second branch of closing
Afterwards, first by third branch along I alkali layer docked with horizontal segment III after with straight well section formed autonomous channel, be passed through central tube to the channel
III, central tube III forms the exploitation that a water-soluble back production unit completes I alkali layer.
Further, straight well B is docked in the first branch, the second branch in S31Afterwards, continue to dock straight well B2When, using brill with pressure
Well technology and RMRS precise positioning technology guarantee straight well B1, straight well B2Along II alkali layer accurate commutation, drilling technology with pressure is solved
Continue to dock straight well B2When straight well B1The technical issues of well a large amount of water bursts.
The beneficial effects of the present invention are:
(1) being docked and connected for multiple wells can be achieved, and exploit different head simultaneously and adopt layer.
(2) total well group arrangement is also reduced and optimized simultaneously, saves duration of a project and land resource.
(3) it adopts to establish on layer in different head and adopts defeated channel, effectively improve brill and meet ore bed length, increase and connect with ore bed
Contacting surface product greatly improves the halogen concentration out that later period note is adopted, to improve the resource recovery ratio of ore bed.
Detailed description of the invention
Fig. 1 is well bore arrangement sectional view of the present invention.
Fig. 2 is wellbore trajectory floor projection schematic diagram of the present invention.
In the figure, it is marked as 1- multi-branched horizontal well, I alkali layer of 2-, II alkali layer of 3-, III alkali layer of 4-, 5- straight well B1,6- straight well
B2,7- horizontal segment I, 8- horizontal segment II, 9- horizontal segment III, the first kickoff point (KOP) of 10-, the second kickoff point (KOP) of 11-, 12- third kickoff point (KOP),
13- central tube I, 14- central tube II, 15- central tube III, the first packer of 16-, the second packer of 17-, 18- third packer,
19- perforation, 20- straight well section.
Specific embodiment
Present invention will be further explained below with reference to the attached drawings and examples.
Embodiment 1:
Layer is adopted with three head, for III alkali layer 4 has bored two straight wells, the of the invention thin interbed native soda deposit that is suitable for
Recovery method specifically comprises the steps of:
S1: determining that head adopts layer, designs water-soluble back production unit:
The features such as passing through areal geology analysis ore bed buried depth, thickness, ore bed inclination first, determines that three head adopt layer i.e.
In conjunction with the distribution of existing well location, distal end straight well has been bored with Review of geologic model building techniques in the position of I alkali layer 2, II alkali layer 3 and III alkali layer 4
B15, straight well B26 three-dimensional track and the information such as the lateral spread of natural alkali mine and longitudinal profile feature, optimization design are such as Fig. 1
Shown in " two straight wells+multi-branched horizontal well " the water-soluble back production unit adopted altogether of multilayer.
S2: straight well B15, straight well B26 are drilled well and shaft building:
Using conventional drilling technique drilling straight-hole B15, straight well B26 to III alkali layer 4, respectively the first target spot well and the second target spot
Well；
To straight well B15, straight well B26 carry out water filling pilot production, build molten chamber, and it is precisely fixed that molten chamber radius should meet multi-branched horizontal well 1
The requirement of position technical matters.
S3: the complete well of multi-branched horizontal well 1 and shaft building:
The straight well section 20 of multi-branched horizontal well 1 is drilled using conventional drill assembly, straight well section 20 is drilled into III alkali layer 4, makes it
With straight well B15, straight well B26 in same level, adopt the factors such as the buried depth of layer, deflecting tool according to three head, determine first
The kickoff point (KOP) of branch, the second branch, third branch, i.e. respectively the first kickoff point (KOP) 10, the second kickoff point (KOP) 11, third kickoff point (KOP)
12；Then the construction of " two straight wells+multi-branched horizontal well " wellbore trajectory is completed, Specific construction is as follows:
First branch straight well B15 and straight well B26 connection: the first branch is established from the first kickoff point (KOP) 10, using gamma with brill
Logging technique ensures that the first branch promotes along III alkali layer 4, and using RMRS precise positioning technology successively with straight well B15 and straight well B26
It is docked and connected, that is, completes the drilling of horizontal segment I 7, the inclination section for then descending the first packer 16, beating the first branch of cement seal,
And to straight well B15 and straight well B26 each lead into central tube I 13, central tube II 14, make central tube I 13, horizontal segment I 7, central tube II
14 form a water-soluble back production unit, by forming the height for being rich in trona to central tube I 13 or the water filling dissolution of central tube II 14
Dense brine, then central tube that it is never filled the water are drawn to ground and process, and complete the exploitation of III alkali layer 4.
Second branch and straight well B15 and straight well B26 connection: after the inclination section of the first branch of closing, from the second kickoff point (KOP) 11
The second branch is established, so that it is close to straight well B using drilling technology with pressure and RMRS precise positioning technology15 protective casing and edge
II alkali layer 3 carries out horizontal segment drilling, continues the Open-Hole Section connection for being advanced into straight well B26, completes the drilling of horizontal segment II 8, continue
Dock straight well B2When 6, the inclination section for then descending the second packer 17, beating the second branch of cement seal, in straight well B15 along II alkali layer 3
With straight well B2The position perforation 19 of 6 docking is simultaneously connected to horizontal segment II 8, makes straight well B15 and straight well B26 docking, then in perforation 19
The straight well B of lower section1Lower third packer 18, makes central tube I 13 and straight well B between 5 and central tube I 131Gap, level between 5
Section II 8, central tube II 14 and straight well B2Gap between 6 forms an annular space, i.e., water-soluble back production unit, by central tube I
13 and straight well B1Gap or central tube II 14 and straight well B between 52Gap between 6 fills the water dissolution, is formed rich in trona
High-concentrated brine, then straight well that it is never filled the water are drawn to ground and process, and complete the exploitation of II alkali layer 3.
The Single well convection of third branch is exploited: since the first branch and the second branch occupy the center of two straight wells respectively
The water flooding recovery channel of pipe and annular space, third branch can only be exploited using Single well convection.Specific construction are as follows: the second branch of closing
After inclination section, third branch is established from third kickoff point (KOP) 12, third branch is drilled into design target spot i.e. completion level along I alkali layer 2
The drilling of section III 9, the straight well section 20 of multi-branched horizontal well 1, third branch, horizontal segment III 9 form autonomous channel, logical to the channel
Enter central tube III 15, central tube III 15 forms a water-soluble back production unit, fills the water and dissolves to central tube III 15, is formed rich in natural
The high-concentrated brine of alkali, then it is drawn to ground from central tube III 15 and is processed, complete the exploitation of I alkali layer 2.
As shown in Fig. 2, multi-branched horizontal well 1, straight well B15, straight well B26 well group track floor projections on the same line, water
On the same line, horizontal segment III 9 is due to lacking connected well convection current exploitation for flat section I 7, the projection of horizontal segment II 8 and well group track
Channel and use Single well convection exploit, thus its projection deviate multi-branched horizontal well 1, straight well B15, straight well B26 well group tracks are set
Meter.If horizontal segment III 9 later period production capacity reduce, can in another horizontal layout at least a bite straight well, by communication around barrier technique,
Realization is docked and connected exploitation.
By taking the creation data of Henan area mining area as an example, compared with using Single well convection exploitation, there is following obvious benefit:
(1) reduce and optimize total well group arrangement, it is contemplated that save expropriation of land direct cost about 2,200,000；
(2) reduce wellbore construction process, save the mine construction duration progress, at least save 3,300,000 correlative charges；
(3) it adopts to establish on layer in different head and adopts defeated channel, effectively improve brill and meet ore bed length, increase and connect with ore bed
Contacting surface product, ore bed Drilling ratio are up to 85% or more；
(4) injectivity and productivity significantly improves.Before recovery method of the invention, note adopts flow about 50m3/h, and concentration is insufficient
50g/L；After the recovery method, note adopts flow about 220m3/ h, the nearly 60g/L of concentration, note adopt concentration and improve about 10%, and note is adopted
Flow increases by 4 times, is equivalent to the injectivity and productivities for increasing a well after being converted to individual well more.
Claims (3)
1. being suitable for the recovery method of thin interbed native soda deposit, it is characterised in that: the following steps are included:
S1: at least two head away from earth's surface different depth are selected to adopt layer according to the seam thickness of thin interbed natural alkali mine and integrity degree
And the water-soluble back production unit of design；
S2: adopting layer arrangement at least two straight wells arranged in a straight line in most deep head, and all straight wells both pass through all head and adopt layer, and to
All straight well water flooding recoveries build molten chamber；
It is built on the same plane of all straight wells in S3:S2 multi-branched horizontal well (1), the multi-branched horizontal well (1) and all straight
Well is arranged in a linear, and multi-branched horizontal well (1) is adopted layer along the head of different depth respectively and is connected to all straight wells, by insulating, penetrating
Hole makes all straight wells adopt one water-soluble back production unit of layer and multi-branched horizontal well (1) formation in each head.
2. being suitable for the recovery method of thin interbed native soda deposit as described in claim 1, it is characterised in that:
Three head are selected to adopt layer according to the seam thickness of thin interbed natural alkali mine and integrity degree in S1, by the depth away from earth's surface by shallow
I alkali layer (2), II alkali layer (3) and III alkali layer (4) are followed successively by deep；
Straight well B is arranged in III alkali layer (4) in S21(5) and straight well B2(6), straight well B1(5) and straight well B2(6) both pass through I alkali layer (2),
II alkali layer (3)；
Multi-branched horizontal well (1) includes straight well section (20) in S3, further includes being separately positioned on I alkali layer (2), II alkali layer (3) and III
Horizontal segment I (7), horizontal segment II (8) and the horizontal segment III (9) of alkali layer (4), horizontal segment I (7), horizontal segment II (8) and horizontal segment III
(9) with straight well B1(5) and straight well B2(6) pass through third branch, the second branch, the connection of the first branch respectively, in which:
First branch and straight well B1(5) and straight well B2(6) connection: first by the first branch along III alkali layer (4) and straight well B1(5) and
Straight well B2(6) molten chamber docking, then closes the inclination section of the first branch, makes straight well B1(5), straight well B2(6) molten chamber is formed pair
It connects, and to straight well B1(5) and straight well B2(6) central tube I (13), central tube II (14), central tube I (13), horizontal segment are each led into
I (7), central tube II (14) form the exploitation that a water-soluble back production unit completes III alkali layer (4)；
Second branch and straight well B1(5) and straight well B2(6) connection: after the inclination section of the first branch of closing, first by the second branch edge
II alkali layer (3) and straight well B1(5) and straight well B2(6) it docks, then closes the inclination section of the second branch, made directly by perforation (19)
Well B1(5) and straight well B2(6) it docks, closes the straight well B below II alkali layer (3)1(5), straight well B1(5), horizontal segment II (8), straight well
B2(6) exploitation that a water-soluble back production unit completes II alkali layer (3) is formed；
The Single well convection of third branch is exploited: since the first branch and the second branch occupy the central tube and annular space of straight well respectively
Note adopt channel, third branch can only be exploited using Single well convection.Specific construction are as follows: after the inclination section of the second branch of closing, first
By third branch along I alkali layer (2) docked with horizontal segment III (9) after with straight well section (20) formed autonomous channel, be passed through to the channel
Central tube III (15), central tube III (15) form the exploitation that a water-soluble back production unit completes I alkali layer (2).
3. being suitable for the recovery method of thin interbed native soda deposit as claimed in claim 2, it is characterised in that: first point in S3
Straight well B is docked in branch, the second branch1(5) after, continue to dock straight well B2When, using drilling technology with pressure and RMRS precise positioning skill
Art.
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| CN110295901A (en) * | 2019-07-30 | 2019-10-01 | 核工业北京化工冶金研究院 | A kind of mining using leaching technology method and system |
| CN110566176A (en) * | 2019-09-26 | 2019-12-13 | 四川盐业地质钻井大队 | Rock salt mine mining method |
| CN111894528A (en) * | 2020-08-31 | 2020-11-06 | 西南石油大学 | A method for multi-gas commingled production and productivity replacement in coal-measure strata |
| CN112302656A (en) * | 2020-05-07 | 2021-02-02 | 内蒙古博源控股集团有限公司 | A dual-horizontal segment classification mining model and process for Na2CO3 and NaHCO3 |
| CN112412393A (en) * | 2020-10-19 | 2021-02-26 | 四川盐业地质钻井大队 | Bittern natural gas waste well differential pressure segmented plugging process |
| CN113389596A (en) * | 2020-03-12 | 2021-09-14 | 中国石油天然气集团有限公司 | Salt layer storage cavity structure and salt layer reservoir building method |
| CN113914840A (en) * | 2021-09-26 | 2022-01-11 | 中国地质大学（武汉） | A kind of mining method of thin layer trona |
| CN115370344A (en) * | 2022-08-01 | 2022-11-22 | 国投新疆罗布泊钾盐有限责任公司 | Salt lake underground brine collecting system and construction method thereof |
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| CN110566176A (en) * | 2019-09-26 | 2019-12-13 | 四川盐业地质钻井大队 | Rock salt mine mining method |
| CN113389596A (en) * | 2020-03-12 | 2021-09-14 | 中国石油天然气集团有限公司 | Salt layer storage cavity structure and salt layer reservoir building method |
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