CN109025911A - A kind of coal bed gas well gaslift draining reservoir protection device and water discharge method - Google Patents
A kind of coal bed gas well gaslift draining reservoir protection device and water discharge method Download PDFInfo
- Publication number
- CN109025911A CN109025911A CN201810964064.1A CN201810964064A CN109025911A CN 109025911 A CN109025911 A CN 109025911A CN 201810964064 A CN201810964064 A CN 201810964064A CN 109025911 A CN109025911 A CN 109025911A
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- CN
- China
- Prior art keywords
- oil pipe
- fixed valve
- beam hanger
- hollow beam
- setting ball
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- 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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
- E21B43/121—Lifting well fluids
- E21B43/122—Gas lift
Abstract
The invention belongs to cbm development and mining technical field, specifically a kind of coal bed gas well gaslift draining reservoir protection device and water discharge method.When solving using coal bed gas well concentric tube type gaslift technology progress mining, it may be by coal dust, the particles such as proppant are pressed into reservoir, the problem of causing reservoir damage, including screen casing fixed valve, setting ball, hoop, oil pipe and hollow beam hanger, oil pipe bottom is connected and fixed valve with hoop, fixed valve bottom connects screen casing, oil pipe is internally provided with hollow beam hanger, oil pipe and hollow beam hanger annular space are formed between oil pipe and hollow beam hanger, one is placed inside fixed valve has the smooth setting ball being centainly self-possessed, there are activity spaces between setting ball and fixed valve, and the lower outlet of setting ball edge and fixed valve fits closely.The configuration of the present invention is simple, reservoir protection significant effect.
Description
Technical field
The invention belongs to cbm development and mining technical field, specifically a kind of coal bed gas well gaslift drains reservoir protection
Device and water discharge method.
Background technique
When carrying out coal bed gas well mining using concentric tube type gaslift technology, due to coal bed gas well interval of interest casing quilt
It is shot through, high pressure gas is in injection process, it is possible to be entered in coal seam reservoirs from preforation tunnel.Not only cause high pressure gas
Loss is unable to complete successfully gaslift, and also water, coal dust, proppant etc. can be pressed into reservoir fracture, bring potential trauma to reservoir
Evil.Therefore, need a kind of simple, efficient gaslift draining reservoir protection device, come when meeting coal bed gas well gaslift to reservoir
Protection, effectively avoids the potential harm to reservoir.
Summary of the invention
It, may be by coal dust, proppant when the present invention is that solution carries out mining using coal bed gas well concentric tube type gaslift technology
The problem of equal particles are pressed into reservoir, cause reservoir damage provides a kind of coal bed gas well gaslift draining reservoir protection device and draining
Method.
The present invention takes following technical scheme: a kind of coal bed gas well gaslift draining reservoir protection device, including screen casing are fixed
Valve, setting ball, hoop, oil pipe and hollow beam hanger, oil pipe bottom are connected and fixed valve with hoop, and fixed valve bottom connects screen casing, oil
Pipe is internally provided with hollow beam hanger, forms oil pipe and hollow beam hanger annular space between oil pipe and hollow beam hanger, places inside fixed valve
One has the smooth setting ball be centainly self-possessed, there are activity space between setting ball and fixed valve, and setting ball edge and fixation
The lower outlet of valve fits closely.
A kind of water discharge method of coal bed gas well gaslift draining reservoir protection device, comprising the following steps:
S100, valve and screen casing are connected and fixed with hoop in oil pipe bottom；
S200, when the natural gas of gaslift is pressed into coal bed gas well from oil pipe and hollow beam hanger annular space, setting ball is in gas
The under shed of fixed valve is blocked under pressure and the collective effect of self weight, liquid is enumerated ground out of hollow beam hanger；
S300, after the fluid column in the above oil pipe of fixed valve and hollow beam hanger annular space is all lifted out ground, it is high to stop injection
It calms the anger body；
S400, at this point, water flooding enters fixed valve by bottom screen casing, setting ball is pushed up under the action of water flooding bearing capacity
It opens, loses setting ability；
S500, water flooding are poured in from the under shed of fixed valve, are entered in oil pipe by upper opening, and hollow beam hanger and oil pipe and sky are made
The liquid level of heart beam hanger annular space reaches balance again；
S600, gas lift system restarting, high pressure gas are pressed into again in oil pipe and hollow beam hanger annular space, and setting ball is again
It is setting, start to carry out next gaslift discharge cycle.
Compared with prior art, the invention has the following advantages that
(1) structure is simple.The reservoir protection device core building block is only made of setting ball and fixed valve, and structure is simple.Together
When, the work of the device is that machinery is setting, and principle is simple, and operability is reliable.
(2) reservoir protection significant effect.Gaslift process can be divided into two independent systems by the present invention, make height
Body of calming the anger acts only in oil pipe, and the outer reservoir of oil pipe is not influenced substantially by high pressure gas, significantly reduces high pressure gas pair
The potential harm of coal seam reservoirs improves gaslift working efficiency.
Detailed description of the invention
Fig. 1 is structure of the invention and connection schematic diagram；
Fig. 2 is working system diagram of the present invention；
1- screen casing in figure, 2- fixed valve, the setting ball of 3-, 4- hoop, 5- oil pipe and hollow beam hanger annular space, 6- oil pipe, the hollow oil of 7-
Bar, 8- oil jacket annulus, 9- casing, the coal seam 10-.
Specific embodiment
As shown in Figure 1, a kind of coal bed gas well gaslift drains reservoir protection device, including screen casing 1, fixed valve 2, setting ball 3,
Hoop 4, oil pipe 6 and hollow beam hanger 7,6 bottom hoop 4 of oil pipe are connected and fixed valve 2, and 2 bottom of fixed valve connects screen casing 1, oil pipe 6
It is internally provided with hollow beam hanger 7, oil pipe and hollow beam hanger annular space 5 is formed between oil pipe 6 and hollow beam hanger 7, is put inside fixed valve 2
Setting one has the smooth setting ball 3 be centainly self-possessed, there are activity space between setting ball 3 and fixed valve 2, and 3 edge of setting ball
Lower outlet with fixed valve 2 fits closely.
A kind of water discharge method of coal bed gas well gaslift draining reservoir protection device, comprising the following steps:
S100, valve 2 and screen casing 1 are connected and fixed in 6 bottom hoop 4 of oil pipe；
S200, it is pressed into coal bed gas well from oil pipe and hollow beam hanger annular space 5 when the natural gas of gaslift, setting ball 3 is in gas
The under shed of fixed valve is blocked under body pressure and the collective effect of self weight, liquid is enumerated ground out of hollow beam hanger 7；
S300, after the fluid column in 2 or more oil pipe of fixed valve and hollow beam hanger annular space 5 is all lifted out ground, stop injection
High pressure gas；
S400, at this point, water flooding enters fixed valve 2, setting ball 3 quilt under the action of water flooding bearing capacity by bottom screen casing 1
It opens, loses setting ability；
S500, water flooding are poured in from the under shed of fixed valve 2, are entered in oil pipe 6 by upper opening, and hollow beam hanger 7 and oil pipe are made
Reach balance again with the liquid level of hollow beam hanger annular space 5；
S600, gas lift system restarting, high pressure gas are pressed into again in oil pipe and hollow beam hanger annular space 5, and setting ball 3 is again
It is secondary setting, start to carry out next gaslift discharge cycle.
Fig. 1 is reservoir protection apparatus structure and connection schematic diagram, which mainly avoids high pressure gas during gaslift
It is damaged from casing wall perforated interval loss, and by the particles such as coal dust, proppant indentation reservoir.Gaslift high pressure gas by from
When in oil pipe and hollow beam hanger annular space indentation well, setting ball seat envelope closes lower part fixed valve under shed, pressure only acts on oil pipe
Inside makes coal seam reservoirs be effectively protected.
Fig. 2 is reservoir protection device working system diagram.Gaslift reservoir protection device is connected to oil pipe bottom, and
Reservoir protection device lower end connects a bit of screen casing, avoids big solid particle from entering in reservoir protection device, reduces the dress
The leakproofness set.When the high pressure gas of gaslift is pressed into well from oil pipe and hollow beam hanger annular space, reservoir protection device is closed
It closes, high pressure gas acts only in oil pipe.After oily liquid in pipe is all discharged, gaslift stops.Setting ball is in oil jacket at this time
It is opened under the action of annular space head of liquid, coal seam water adds to oil pipe and sky by bottom screen casing, fixed valve under shed again
In heart beam hanger.Liquid level reaches new balance between hollow beam hanger, oil pipe and casing, and gaslift carries out again.
Gaslift draining before, the liquid in coal seam enters oil pipe by screen casing and fixed valve, make oil jacket annulus, oil pipe with it is hollow
Liquid level between beam hanger annular space, hollow beam hanger is at the same level.When gaslift is pressed into natural gas from oil pipe and hollow beam hanger annular space, seat
Blocking is firmly pressed on fixed valve under shed, is completed setting.Make to become an independent enclosure space in oil pipe, ensure that height
Body of calming the anger can only act in oil pipe, not can enter reservoir.Liquid in oil pipe enumerates ground from hollow beam hanger by high pressure gas
Face stops gas injection after the liquid in oil pipe is all discharged.At this point, the liquid in coal bed gas well exists only in oil jacket annulus
In.
Setting ball is opened under the action of oil jacket annulus head of liquid, and the liquid of oil jacket annulus is through screen casing and fixed valve weight
It newly enters in oil pipe, the liquid level of oil jacket annulus and oil pipe is made to maintain an equal level again.
High pressure gas is pressed into from oil pipe and hollow beam hanger annular space again, and setting ball sealing is stifled, and reservoir protection device is again
Starting, new round gaslift start.Setting, the unlatching of gaslift protective device in cycles, while ensureing that gaslift smoothly drains,
Achieve the purpose that protect reservoir.To improve the efficiency of gaslift draining.
Claims (2)
1. a kind of coal bed gas well gaslift drains reservoir protection device, it is characterised in that: including screen casing (1) fixed valve (2), setting ball
(3), hoop (4), oil pipe (6) and hollow beam hanger (7), oil pipe (6) bottom are connected and fixed valve (2) with hoop (4), fixed valve (2)
Bottom connects screen casing (1), and oil pipe (6) is internally provided with hollow beam hanger (7), forms oil pipe between oil pipe (6) and hollow beam hanger (7)
With hollow beam hanger annular space (5), fixed valve (2) is internal to place one with the smooth setting ball (3) being centainly self-possessed, setting ball (3)
There are activity spaces between fixed valve (2), and setting ball (3) edge and the lower outlet of fixed valve (2) fit closely.
2. a kind of water discharge method of coal bed gas well gaslift draining reservoir protection device as described in claim 1, it is characterised in that:
The following steps are included:
S100, valve (2) and screen casing (1) are connected and fixed with hoop (4) in oil pipe (6) bottom；
S200, when the natural gas of gaslift is by from oil pipe and hollow beam hanger annular space (5) in indentation coal bed gas well, setting ball (3)
The under shed of fixed valve is blocked under gas pressure and the collective effect of self weight, liquid is enumerated ground out of hollow beam hanger (7)
Face；
S300, after the fluid column in fixed valve (2) the above oil pipe and hollow beam hanger annular space (5) is all lifted out ground, stop
Inject high pressure gas；
S400, at this point, water flooding is entered fixed valve (2) by bottom screen casing (1), work of the setting ball (3) in water flooding bearing capacity
It is opened with lower, loses setting ability；
S500, water flooding are poured in from the under shed of fixed valve (2), are entered in oil pipe (6) by upper opening, and hollow beam hanger (7) are made
Reach balance again with the liquid level of oil pipe and hollow beam hanger annular space (5)；
S600, gas lift system restarting, high pressure gas are pressed into again in oil pipe and hollow beam hanger annular space (5), setting ball
(3) setting again, start to carry out next gaslift discharge cycle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810964064.1A CN109025911A (en) | 2018-08-23 | 2018-08-23 | A kind of coal bed gas well gaslift draining reservoir protection device and water discharge method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810964064.1A CN109025911A (en) | 2018-08-23 | 2018-08-23 | A kind of coal bed gas well gaslift draining reservoir protection device and water discharge method |
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| CN109025911A true CN109025911A (en) | 2018-12-18 |
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| CN201810964064.1A Pending CN109025911A (en) | 2018-08-23 | 2018-08-23 | A kind of coal bed gas well gaslift draining reservoir protection device and water discharge method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110984880A (en) * | 2019-12-25 | 2020-04-10 | 山西晋城无烟煤矿业集团有限责任公司 | Well repairing method for treating sand burial of coal-bed gas well |
| CN111042774A (en) * | 2019-12-25 | 2020-04-21 | 山西晋城无烟煤矿业集团有限责任公司 | Method for switching whole cylinder pump and gas lift extraction mode without sleeve pressure unloading |
| CN112855088A (en) * | 2021-04-06 | 2021-05-28 | 中联煤层气有限责任公司 | Method for improving gas production rate of coal bed |
| CN114183099A (en) * | 2022-02-15 | 2022-03-15 | 东营云起石油科技有限公司 | Negative pressure lifting shaft liquid operation method |
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| US20040244988A1 (en) * | 2003-06-05 | 2004-12-09 | Preston Yale Matthew | Baffle system for two-phase annular flow |
| CN102472089A (en) * | 2009-06-29 | 2012-05-23 | 国际壳牌研究有限公司 | System and method for intermittent gas lift |
| US20170051588A1 (en) * | 2015-08-19 | 2017-02-23 | Encline Artificial Lift Technologies LLC | Gas Compression System For Wellbore Injection, and Method For Optimizing Gas Injection |
| CN107558962A (en) * | 2017-07-21 | 2018-01-09 | 山西晋城无烟煤矿业集团有限责任公司 | Concentric tube type batch-type gaslift drainage technology |
-
2018
- 2018-08-23 CN CN201810964064.1A patent/CN109025911A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040244988A1 (en) * | 2003-06-05 | 2004-12-09 | Preston Yale Matthew | Baffle system for two-phase annular flow |
| CN102472089A (en) * | 2009-06-29 | 2012-05-23 | 国际壳牌研究有限公司 | System and method for intermittent gas lift |
| US20170051588A1 (en) * | 2015-08-19 | 2017-02-23 | Encline Artificial Lift Technologies LLC | Gas Compression System For Wellbore Injection, and Method For Optimizing Gas Injection |
| CN107558962A (en) * | 2017-07-21 | 2018-01-09 | 山西晋城无烟煤矿业集团有限责任公司 | Concentric tube type batch-type gaslift drainage technology |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110984880A (en) * | 2019-12-25 | 2020-04-10 | 山西晋城无烟煤矿业集团有限责任公司 | Well repairing method for treating sand burial of coal-bed gas well |
| CN111042774A (en) * | 2019-12-25 | 2020-04-21 | 山西晋城无烟煤矿业集团有限责任公司 | Method for switching whole cylinder pump and gas lift extraction mode without sleeve pressure unloading |
| CN111042774B (en) * | 2019-12-25 | 2021-08-20 | 山西晋城无烟煤矿业集团有限责任公司 | Method for switching whole cylinder pump and gas lift extraction mode without sleeve pressure unloading |
| CN110984880B (en) * | 2019-12-25 | 2021-08-27 | 山西晋城无烟煤矿业集团有限责任公司 | Well repairing method for treating sand burial of coal-bed gas well |
| CN112855088A (en) * | 2021-04-06 | 2021-05-28 | 中联煤层气有限责任公司 | Method for improving gas production rate of coal bed |
| CN114183099A (en) * | 2022-02-15 | 2022-03-15 | 东营云起石油科技有限公司 | Negative pressure lifting shaft liquid operation method |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20181218 |
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| RJ01 | Rejection of invention patent application after publication |