CN206693990U - A kind of coal bed gas well well washing apparatus - Google Patents
A kind of coal bed gas well well washing apparatus Download PDFInfo
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- CN206693990U CN206693990U CN201720335137.1U CN201720335137U CN206693990U CN 206693990 U CN206693990 U CN 206693990U CN 201720335137 U CN201720335137 U CN 201720335137U CN 206693990 U CN206693990 U CN 206693990U
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- pipe
- oil pipe
- packer
- well
- pit shaft
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Abstract
The utility model discloses a kind of coal bed gas well well washing apparatus, including oil pipe (1), described device also includes：Packer (2), the first pipe (3) into the oil pipe (1) inside, the annular space (4) between the described first pipe (3) and the oil pipe (1) being connected with the oil pipe (1)；First pipe (3) connects through the packer (2) with pit shaft, and the oil pipe (1) connects with pit shaft.The utility model is used cooperatively by packer, oil pipe, the first pipe, is made annular space of the flushing fluid not through oil pipe between sleeve pipe, is avoided reservoir damage, improves well-flushing efficiency.
Description
Technical field
It the utility model is related to a kind of coal bed gas well well washing apparatus.
Background technology
Coal bed gas is the common of coal, accompanying gas resource, is born from storage certainly by coal seam.In China East Ordos Basin south edge
Coal Pore Structure be mainly granulated coal, granulated coal is the main source of coal dust output, and its clay mineral content is overall higher, mechanical
Intensity is small, therefore coal bed gas well easily output coal dust in the block.Coal dust output causes coal bed gas well that holddown, pump leakage frequently occurs
The underground failures such as mistake, screen casing blocking, influence coal bed gas well exploitation continuity.Therefore circulation need to be passed through to the coal dust deposited in pit shaft
Well-flushing is lifted to ground, to reduce coal powder density, delays holddown, pump leakage, the generation of screen casing blocking.
The coal bed gas well well washing apparatus used at present lowers into pit shaft for oil pipe, by oil pipe, or directly using production
With oil pipe, flushing fluid is passed through in oil pipe, with the continuous injection of flushing fluid, the coal dust deposited in pit shaft taken by flushing fluid
Annular space of the band between oil pipe and sleeve pipe, and ground is lifted to, realize the cleaning to the coal dust in pit shaft.
During the utility model is realized, designer has found that prior art at least has problems with：
Flushing fluid enters pit shaft by oil pipe, is then discharged by the annular space between oil pipe and sleeve pipe, what flushing fluid flowed through
Route can directly contact with reservoir, and because coal bed gas well by exploiting for a long time, near wellbore zone has deficit, and flushing fluid largely enters
Enter stratum, circulation returning fluid is less or can not return out at all, and well washing effect is poor, and easily causes a large amount of flushing fluids and enter coal
Layer and cause reservoir damage.
Utility model content
In order to solve the problems, such as that prior art is above-mentioned, the utility model embodiment provides a kind of coal bed gas well well-flushing dress
Put.Technical scheme is as follows：
A kind of coal bed gas well well washing apparatus, including oil pipe, described device also include：The packer that is connected with the oil pipe,
Into the first pipe inside the oil pipe, the annular space between the described first pipe and the oil pipe；
First pipe connects through the packer with pit shaft, and the oil pipe connects with pit shaft.
Specifically, the oil pipe includes the first oil pipe being connected to above the packer and is connected under the packer
Second oil pipe of side；First oil pipe connects with second oil pipe.
Specifically, the end of first pipe is cusp-shaped.
Alternatively, the end of first pipe is the inclined-plane only with a summit.
Alternatively, the diameter ratio of first pipe and the oil pipe is 1:2.
Alternatively, the packer is mechanical packer.
Alternatively, the model Y221-114 of the packer, the name of model herein is named according to professional standard.
The beneficial effect brought of technical scheme that the utility model embodiment provides is：
Wellbore space to be cleaned is separated with extraneous by packer, by packer and oil pipe by flushing fluid with storing up
Layer exploitation perforated interval separates, and makes annular space of the flushing fluid not through oil pipe between sleeve pipe, avoids reservoir damage, flushing fluid is suitable
The first inside pipe wall and be downwardly into pit shaft, after carrying the coal dust deposited on wellbore bottom and barrel, in the effect of injection pressure
Under continue to flow, i.e., the annular space between the first pipe and oil pipe moves up, and then is lifted to ground, improves well-flushing effect
Rate.
Brief description of the drawings
, below will be to needed for embodiment description in order to illustrate more clearly of the technical scheme in the embodiment of the utility model
The accompanying drawing to be used is briefly described, it should be apparent that, drawings in the following description are only some realities of the present utility model
Example is applied, for those of ordinary skill in the art, on the premise of not paying creative work, can also be according to these accompanying drawings
Obtain other accompanying drawings.
Fig. 1 is the coal bed gas well well washing apparatus structural representation that the utility model embodiment provides.
Reference is:
1st, oil pipe；2nd, packer；3rd, the first pipe；4th, annular space；5th, sleeve pipe；6th, reservoir exploitation perforated interval；101st, the first oil pipe；
102nd, the second oil pipe.
Embodiment
It is new to this practicality below in conjunction with accompanying drawing to make the purpose of this utility model, technical scheme and advantage clearer
Type embodiment is described in further detail.
A kind of coal bed gas well well washing apparatus, as shown in figure 1, it includes oil pipe 1, and the packing being connected with the oil pipe 1
Device 2, into the first pipe 3 inside the oil pipe 1, the annular space 4 between first pipe 3 and the oil pipe 1；
First pipe 3 connects through the packer 2 with pit shaft, and the oil pipe 1 connects with pit shaft.
When in use, oil pipe 1 and packer 2 are attached, both is lowered into the sleeve pipe 5 of pit shaft, will insulated
Device is set in the lower section of reservoir exploitation perforated interval 6, separates the annular space between oil-pipe external wall and sleeve pipe 5, is made under extraneous and packer
The communicating passage of side space is only oil pipe 1, then lowers into the first pipe 3 inside oil pipe 1, and enters envelope through packer 2
Connect, flushing fluid is injected from the first pipe 3, flushing fluid is downwardly into along the inwall of the first pipe 1 with pit shaft every device underlying space
Pit shaft, after carrying the coal dust deposited on wellbore bottom and barrel, continue to flow in the presence of pressure is injected, i.e., along first
Annular space 4 between pipe 3 and oil pipe moves up, and then is lifted to ground, the arrow in the flow direction of flushing fluid liquid stream such as Fig. 1
Direction shown in head.The coal dust in pit shaft is lifted to ground by flushing fluid circulation well cleanup so as to realize, by packer 2 with
And oil pipe 1 by flushing fluid and reservoir exploitation perforated interval separate, avoid flushing fluid into reservoir and caused by reservoir damage, and
And improve well-flushing efficiency.
It should be noted that packer 2 setting position selection reservoir exploitation perforated interval 6 lower section set, be in order to
Avoid flushing fluid from being contacted with the direct of reservoir, wellbore space to be cleaned is separated with extraneous by packer 2, passes through packer
2 and oil pipe 1 by flushing fluid and reservoir exploitation perforated interval 6 separate, make ring of the flushing fluid not through oil pipe 1 between sleeve pipe 5
Sky, avoid reservoir damage.
Specifically, the oil pipe 1 includes being connected to the first oil pipe 101 of the top of packer 2 and is connected to the envelope
The second oil pipe 102 every the lower section of device 2；First oil pipe 101 connects with second oil pipe 102.In the process of actual use
In, the through hole at the center of packer 2 can connected pipes, form fluid course.
The end of first pipe 3 is cusp-shaped.The first pipe 3 is lowered into pit shaft from oil pipe 1 in use,
The coal dust that pit shaft may deposit close to the position of bottom is more, end for cusp-shaped the first pipe 3 if contacted with coal dust, also not
Completely plugged first pipe 3 of meeting, Comparatively speaking, end once contacts coal dust for the pipe of plane, it is easy to blocks end.It is preferred that
Ground, the end of first pipe 3 is the inclined-plane (can be seen that from Fig. 1 plan) only with a summit.
Further, the diameter ratio preferably 1 of first pipe 3 and the oil pipe 1:2, between the first pipe 3 and oil pipe 1 it
Between annular space 4 be rising passway that flushing fluid is exited into from the first pipe 3 after pit shaft, the excessively stream that the annular space 4 is formed is cut
Size between the diameter of face and the first pipe 3 has an impact for well-flushing efficiency, for example, when the overflow section of annular space 4 is excessive,
And the diameter of the first pipe 3 is smaller, the speed that flushing fluid up flows is slow, under gravity, coal dust may also not by
Giving rise to well head can deposit in pit shaft again, reduce the efficiency of well-flushing.And being relatively large in diameter when the first pipe 3, and the mistake of annular space 4
When flow section is smaller, then easily occur that bottom pressure is larger, and shaft bottom builds the pressure, increase the load of packer, also cause ground installation
Load increase.Therefore, the diameter ratio of first pipe 3 and the oil pipe 1 should be selected to make well-flushing efficiency optimization, and the present invention is implemented
Both diameter ratios preferably 1 of example:2, it will be appreciated by those skilled in the art that first pipe 3 and the oil pipe 1
Diameter need to be controlled within the scope of certain than only, you can meet the lifting of well-flushing efficiency, can be with different actual conditions
Make corresponding adjustment.
In addition, the packer 2 should be mechanical packer, according to the difference of the species of packer 2, it sets, unseals
Mode is then different, such as mechanical packer can be set by rotation, and then by above proposing deblocking, hydraulic packer can be with
Build the pressure and set by injecting liquid from oil pipe.But device provided by the utility model is because the bottom of oil pipe 1 need to connect with pit shaft,
That is the bottom of the second oil pipe 102 is open that for forming continuous flushing fluid flow channel, and some hydraulic packers need
Want the bottom of oil pipe to seal to set to realize, therefore in order to not hinder flushing fluid flow channel, used in the utility model
Packer be preferably mechanical packer, more preferably model Y221-114 packer, those skilled in the art can be with
Understand, according to different casing sizes, preferable packer model can make corresponding adjustment herein.
Parameters of the present utility model are illustrated with one embodiment below：
Come so that the external diameter of sleeve pipe 5 is 139.7mm as an example for example, coal bed gas well well washing apparatus provided by the utility model
The external diameter of oil pipe 1 be 73mm, the external diameter of the first pipe 3 is 36mm, packer model Y221-114, and the name of model herein is
Named according to professional standard.
Above-mentioned all optional technical schemes, any combination can be used to form the alternative embodiment of the disclosure, herein no longer
Repeat one by one.
Preferred embodiment of the present utility model is the foregoing is only, it is all in this practicality not to limit the utility model
Within new spirit and principle, any modification, equivalent substitution and improvements made etc., guarantor of the present utility model should be included in
Within the scope of shield.
Claims (6)
1. a kind of coal bed gas well well washing apparatus, including oil pipe (1), it is characterised in that described device also includes：With the oil pipe
(1) packer (2) of connection, into the first internal pipe (3) of the oil pipe (1), between the described first pipe (3) and the oil pipe
(1) annular space (4) between；
First pipe (3) connects through the packer (2) with pit shaft, and the oil pipe (1) connects with pit shaft.
2. device according to claim 1, it is characterised in that the oil pipe (1) includes being connected on the packer (2)
The first oil pipe (101) of side and the second oil pipe (102) being connected to below the packer (2)；First oil pipe (101) with
Second oil pipe (102) connection.
3. device according to claim 1, it is characterised in that the end of first pipe (3) is cusp-shaped.
4. device according to claim 3, it is characterised in that the end of first pipe (3) is only to have a summit
Inclined-plane.
5. device according to claim 4, it is characterised in that first pipe (3) and the diameter ratio of the oil pipe (1) are
1:2。
6. device according to claim 1, it is characterised in that the packer (2) is mechanical packer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720335137.1U CN206693990U (en) | 2017-03-31 | 2017-03-31 | A kind of coal bed gas well well washing apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720335137.1U CN206693990U (en) | 2017-03-31 | 2017-03-31 | A kind of coal bed gas well well washing apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206693990U true CN206693990U (en) | 2017-12-01 |
Family
ID=60441264
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720335137.1U Active CN206693990U (en) | 2017-03-31 | 2017-03-31 | A kind of coal bed gas well well washing apparatus |
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| Country | Link |
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| CN (1) | CN206693990U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113356774A (en) * | 2020-03-06 | 2021-09-07 | 中国石油天然气股份有限公司 | Well washing method and device for protecting coal gas layer |
| CN113586007A (en) * | 2021-09-06 | 2021-11-02 | 王军 | Method for determining flow rate of washing pump injection liquid of coal-bed gas well on site |
-
2017
- 2017-03-31 CN CN201720335137.1U patent/CN206693990U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113356774A (en) * | 2020-03-06 | 2021-09-07 | 中国石油天然气股份有限公司 | Well washing method and device for protecting coal gas layer |
| CN113586007A (en) * | 2021-09-06 | 2021-11-02 | 王军 | Method for determining flow rate of washing pump injection liquid of coal-bed gas well on site |
| CN113586007B (en) * | 2021-09-06 | 2023-08-18 | 王军 | Method for determining flow of washing pump injection liquid of coal-bed gas well on site |
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