CN108331560B - A kind of coal bed gas surface well pumping method of minery containing water flooding - Google Patents
A kind of coal bed gas surface well pumping method of minery containing water flooding Download PDFInfo
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- CN108331560B CN108331560B CN201810085715.XA CN201810085715A CN108331560B CN 108331560 B CN108331560 B CN 108331560B CN 201810085715 A CN201810085715 A CN 201810085715A CN 108331560 B CN108331560 B CN 108331560B
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- Prior art keywords
- casing
- well
- open
- bed gas
- minery
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B43/006—Production of coal-bed methane
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/10—Wear protectors; Centralising devices, e.g. stabilisers
- E21B17/1078—Stabilisers or centralisers for casing, tubing or drill pipes
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B43/02—Subsoil filtering
- E21B43/08—Screens or liners
- E21B43/086—Screens with preformed openings, e.g. slotted liners
Abstract
Coal bed gas extraction of the present invention field, disclose a kind of coal bed gas surface well pumping method of minery containing water flooding, surface well is arranged to three and driven a well body structure by this method, increase protective device on casing by opening two, even if two, which open casing, there is movement and deformation or fracture, increased protective device make two to open casing is more together to be protected, so that two destructions for driving a well body be effectively relieved；The steel strainer for opening sleeve bottom positioned at two ensure that the sand grains that stratum water burst carries does not enter three and drives a well body, and the three three-stage designs for opening casing had both prevented the sand grains of stratum water burst carrying into shaft bottom or borehole wall sieve pore, the structural stability that surface well can be enhanced again, has preferably ensured extracting result.
Description
Technical field
The invention belongs to coal bed gas extraction fields, and in particular to a kind of coal bed gas surface well of minery containing water flooding extraction side
Method.
Background technique
The technology of existing minery coal bed gas (gas) surface well can be solved preferably distressed zone coal bed gas (gas), including
The coal bed gas (gas) for (adopting dynamic stability area) after (mining influence area) and coal back production in coal back production；But for aquifer water-bearing stratum
For, minery coal bed gas surface well extracting result can be impacted.Main reason is that: surface well can generate change after adopting disturbance
Shape or even slight damage, but gas channel is still smooth, and due to the presence in water-bearing layer, water-bearing layer will take blowout and enter well set
It is interior, certain blocking is generated to the mining induced fissure in shaft bottom and the borehole wall, to influence extracting result.Preferable be directed to there is no to contain at present
The method of water stratum minery coal bed gas surface well extraction.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of coal bed gas surface well pumping method of minery containing water flooding,
To enhance surface well structural stability, prevent the sand grains of stratum water burst carrying into shaft bottom or borehole wall sieve pore.
In order to achieve the above objectives, the invention provides the following technical scheme: a kind of coal bed gas surface well of minery containing water flooding
Pumping method, surface well are arranged to three and drive a well body structure, mainly comprise the steps that
(1) one drives a well body from earth drilling to the following certain distance of basement rock, after install one and open casing and cement the well；
(2) two bodies that drive a well are crept into coal mining overlying strata fissure zone top edge, are installed two and are opened casing and make two to open cannula tip height
Earth's surface certain distance out；It two is opening and installs protective device on casing corresponding to the violent position section of strata deformation, it is laggard
Row two opens casing cementing；
(3) installation suspension interstage sleeve at casing shoe is opened two；
(4) three bodies that drive a well drill coal seam to following certain distance, install in earth's surface to the above certain distance in coal seam is interregional
Three open casing；Described three, which open casing, is from top to bottom followed successively by " sieve tube segment-casing section-sieve tube segment ", the sieve tube segment of middle and lower part
It drives a well body bottom surface since two to hereinafter, the two body bottom surface above sections that drive a well then are " sieve tube segment-casing section "；
(5) it is opened three and hanging sleeve and strainer is installed below casing, strainer is located above hanging sleeve；Three, which open cannula tip, passes through fixation
Plate is opened casing with two and is mutually fixed, and lower section then passes through the hanging sleeve correspondence being disposed thereon and hangs on the two suspension interstage sleeves for opening casing shoe
On.
Further, a drilling distance for driving a well body is a in the step (1), and a is basement rock or less 10m；The step
(2) two open cannula tip and are higher by earth's surface 0.3m in；A drilling distance for driving a well body is d in the step (4), and the d is from earth's surface
It is drilled into coal seam or less 10m-15m.
Further, the suspension interstage sleeve in the step (3) is equipped with multistage and arranges up and down.
Further, the strainer in the step (5) has two layers and arranges up and down.
It is three to drive a well body structure the beneficial effects of the present invention are: the surface well, wherein two open on casing and increase anti-
Protection unit, even if two open casing and movement and deformation or fracture occur, increased protective device make two to open casing is more to be protected together, energy
Two destructions for driving a well body are effectively relieved；The steel strainer for opening sleeve bottom positioned at two can guarantee the sand grains of stratum water burst carrying not
It drives a well body into three, and the sand grains that the three three-stage designs for opening casing had both prevented stratum water burst to carry is sieved into shaft bottom or the borehole wall
Hole, and the structural stability of surface well can be enhanced, preferably ensure extracting result.
Detailed description of the invention
In order to keep the purpose of the present invention, technical scheme and beneficial effects clearer, the present invention provides following attached drawing and carries out
Illustrate:
Fig. 1 is schematic diagram of the invention.
Specific embodiment
Below in conjunction with attached drawing, a preferred embodiment of the present invention will be described in detail.
For the extraction for solving the problems, such as the coal bed gas surface well of minery containing water flooding, as shown, the present embodiment is by surface well
It is arranged to three to drive a well body structure, mainly comprises the steps that
(1) one drives a well body 10m below from earth drilling to basement rock, after install one and open casing 1 and cement the well；
(2) two bodies that drive a well are crept into coal mining overlying strata fissure zone top edge, are installed two and are opened casing 2 and make two to open 2 top of casing
It is higher by 0.2~0.4m of earth's surface；It two is opening and installs protective device on casing corresponding to the violent position section of strata deformation, after
It carries out two and opens casing cementing；It two opens cannula tip herein and is higher by the setting of earth's surface ground scene extraction system can be enable preferably to pacify
If to facilitate extraction；And the protective device that two open on casing is set can open casing for two and certain deformation space is provided, make
Two open casing can certain stretcher strain in tension in the axial direction, to not damage well bore, i.e., at " strata deformation is violent "
In the case of open casing to two and play a certain protective role.
(3) 2 bottom end of casing installation suspension interstage sleeve 3 is opened two；
(4) three bodies that drive a well drill coal seam to following 10~15m, install three to the above certain distance in coal seam is interregional in earth's surface
Open casing 4；Described three, which open casing, is from top to bottom followed successively by " sieve tube segment-casing section-sieve tube segment ", the sieve tube segment of middle and lower part from
Two drive a well body bottom surface start to hereinafter, top sieve tube segment since earth's surface to following certain distance, middle part is then casing section；Tool
Body, casing 4 is opened by three and is arranged to sieve tube segment-casing section-sieve tube segment form, and superposed sieve tube segment is opened for extraction two
Drive a well the coal bed gas that overlying strata crack comes out between body with three, the casing section at middle part for preventing water or sand from blocking extraction channel, and
The sieve tube segment of lower part is then used for the coal bed gas in extraction coal seam and coal seam top gap region；It should be noted that this three opens casing
Bottom end is arranged in coal seam top certain distance, is to prevent the later period from mining to ensure that screen casing does not influence seam mining and be difficult to handle.
(5) it is opened three and hanging sleeve and strainer 5 is installed below casing 4, strainer 5 is located above hanging sleeve；Three, which open cannula tip, passes through
Fixed plate 6 is opened casing with two and is mutually fixed, and lower section then passes through that the hanging sleeve that is disposed thereon is corresponding to be hung on two and open the outstanding of casing shoe
It puts into gear on set 3, well has been hung in realization.For fixed plate 6 herein there are two effect, one is to make three to open casing placed in the middle as far as possible, another
It is a, it is to try to sealing two and opens the gap to drive a well between body with three, prevent gas leakage to earth's surface.Two open the suspension of casing shoe
Interstage sleeve 3 is to be welded on two to open cross interstage sleeve on the inside of casing, and the extension matched with suspension interstage sleeve is set on three pairs for opening casing
Position is answered, is cooperated by the two, ensure that two open the connection opened with three.
Suspension interstage sleeve 3 in step (3) can be equipped with multistage, and arrangement up and down；At least two layers of strainer 5 in step (5)
And it arranges up and down.The steel strainer for opening sleeve bottom positioned at two can guarantee that the sand grains that stratum water burst carries does not enter three and drives a well
Body, the three of Quan Jingshen, which open casing then, can enhance the stable structure of surface well.
The surface well is three to drive a well body structure, wherein two open on casing and increase protective device, two opens casing at this time and has
The mobile effect of overlying strata is resisted, even if two open casing and movement and deformation or fracture occur, increased protective device makes two, and to open casing more
It protects together, two destructions for driving a well body can be effectively relieved, therefore increase ground structure stability or connectivity.And three open casing
Three-stage design then prevent stratum water burst to carry sand grains into shaft bottom or borehole wall sieve pore, therefore the increase of the casing can be preferably
Ensure extracting result.
Finally, it is stated that preferred embodiment above is only used to illustrate the technical scheme of the present invention and not to limit it, although logical
It crosses above preferred embodiment the present invention is described in detail, however, those skilled in the art should understand that, can be
Various changes are made to it in form and in details, without departing from claims of the present invention limited range.
Claims (4)
1. a kind of coal bed gas surface well pumping method of minery containing water flooding, it is characterised in that: surface well is arranged to three and drives a well body
Structure mainly comprises the steps that
(1) one drives a well body from earth drilling to the following certain distance of basement rock, after install one and open casing and cement the well；
(2) two bodies that drive a well are crept into coal mining overlying strata fissure zone top edge, are installed two and are opened casing and make two to open cannula tip and are higher by ground
Table certain distance；It two is opening and installs protective device on casing corresponding to the violent position section of strata deformation, carrying out two afterwards
Open casing cementing；
(3) installation suspension interstage sleeve at casing shoe is opened two；
(4) three bodies that drive a well drill coal seam to following certain distance, install three to the above certain distance in coal seam is interregional in earth's surface and open
Casing；Described three, which open casing, is from top to bottom followed successively by " sieve tube segment-casing section-sieve tube segment ", and the sieve tube segment of middle and lower part is from two
The body bottom surface that drives a well starts to hereinafter, the two body bottom surface above sections that drive a well then are " sieve tube segment-casing section "；
(5) it is opened three and hanging sleeve and strainer is installed below casing, strainer is located above hanging sleeve；Three open cannula tip by fixed plate with
Two, which open casing, mutually fixes, and lower section then passes through that the hanging sleeve that is disposed thereon is corresponding to be hung on two and open on the suspension interstage sleeve of casing shoe.
2. the coal bed gas of minery containing water flooding surface well pumping method according to claim 1, it is characterised in that:
A drilling distance for driving a well body is a in the step (1), and a is basement rock or less 10m；
Two open cannula tip and are higher by 0.2~0.4m of earth's surface in the step (2)；
A drilling distance for driving a well body is d in the step (4), and the d is drilled into coal seam or less 10m~15m from earth's surface.
3. the coal bed gas of minery containing water flooding surface well pumping method according to claim 1, it is characterised in that: the step
Suddenly the suspension interstage sleeve in (3) is equipped with multistage and arranges up and down.
4. the coal bed gas of minery containing water flooding surface well pumping method according to claim 1, it is characterised in that: the step
Suddenly the strainer in (5) has two layers and arranges up and down.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810085715.XA CN108331560B (en) | 2018-01-29 | 2018-01-29 | A kind of coal bed gas surface well pumping method of minery containing water flooding |
Applications Claiming Priority (1)
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| CN201810085715.XA CN108331560B (en) | 2018-01-29 | 2018-01-29 | A kind of coal bed gas surface well pumping method of minery containing water flooding |
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| CN108331560A CN108331560A (en) | 2018-07-27 |
| CN108331560B true CN108331560B (en) | 2019-04-02 |
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| CN109630189B (en) * | 2018-12-12 | 2021-01-01 | 中煤科工集团重庆研究院有限公司 | Method for controlling coal face gas of ground well in mining area of high gas mine |
| CN111075349B (en) * | 2019-12-20 | 2021-08-27 | 山西晋城无烟煤矿业集团有限责任公司 | Construction method of ground mining empty well suspension type well body structure |
| CN112796680B (en) * | 2021-01-04 | 2022-05-03 | 中煤科工集团重庆研究院有限公司 | Suspension installation method for protecting casing pipe of pre-pumping ground well to mining well |
| CN113863895A (en) * | 2021-04-30 | 2021-12-31 | 中国矿业大学 | Well body structure of oil and gas well penetrating through recoverable coal seam and construction method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CA2304938C (en) * | 1999-08-31 | 2008-02-12 | Suncor Energy Inc. | Slanted well enhanced extraction process for the recovery of heavy oil and bitumen using heat and solvent |
| CN1313702C (en) * | 2005-06-02 | 2007-05-02 | 淮南矿业(集团)有限责任公司 | Gas pressure relief method of ground drilling extraction minery and goaf |
| CN101915072B (en) * | 2010-08-04 | 2014-03-26 | 中煤科工集团重庆研究院 | Method for extracting coal bed gas in stable mining region by ground well drilling |
| CN102121364A (en) * | 2011-02-14 | 2011-07-13 | 中国矿业大学 | Well structure of pressure-releasing coal bed gas ground extraction well and arrangement method thereof |
| CN203201486U (en) * | 2013-04-17 | 2013-09-18 | 中煤科工集团重庆研究院 | Casing pipe device for mining area coal-bed gas well on ground |
| US9097108B2 (en) * | 2013-09-11 | 2015-08-04 | Baker Hughes Incorporated | Wellbore completion for methane hydrate production |
| CN204627657U (en) * | 2014-12-01 | 2015-09-09 | 河南立升怡兴油气技术开发有限公司 | Coal mine gas ground extraction casing programme |
| CN104895531A (en) * | 2015-04-30 | 2015-09-09 | 山西蓝焰煤层气集团有限责任公司 | Single thick coal seam ground mining well extraction process |
| CN107401393B (en) * | 2017-07-31 | 2023-07-25 | 山西晋城无烟煤矿业集团有限责任公司 | Drainage and gas production integrated goaf gas extraction well body structure and construction method thereof |
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