CN108590597A - A kind of wellbore protective device and method - Google Patents
A kind of wellbore protective device and method Download PDFInfo
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- CN108590597A CN108590597A CN201810349915.1A CN201810349915A CN108590597A CN 108590597 A CN108590597 A CN 108590597A CN 201810349915 A CN201810349915 A CN 201810349915A CN 108590597 A CN108590597 A CN 108590597A
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- inner layer
- layer sleeve
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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
- E21B43/02—Subsoil filtering
- E21B43/08—Screens or liners
- E21B43/086—Screens with preformed openings, e.g. slotted liners
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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
- E21B43/34—Arrangements for separating materials produced by the well
- E21B43/38—Arrangements for separating materials produced by the well in the well
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Abstract
The embodiment of the present application discloses a kind of wellbore protective device and method, and wellbore protective device is applied in well caving completion pit shaft, which includes：Upper inner layer sleeve, support screen casing and lower inner layer sleeve；Wherein, support screen pipe supports for connecting inner layer sleeve and lower inner layer sleeve and forms hole on screen casing, and support screen casing is applied to the cave section in well caving completion pit shaft, upper inner layer sleeve is applied to cave section top, and lower inner layer sleeve is applied to cave section lower section to the bottom of well caving completion pit shaft.After the wellbore protective device is placed in well caving completion pit shaft; well caving completion pit shaft can be connected to by the hole on the support screen casing of cave section with coal seam; simultaneously supporting screen casing can stop that the collapse coal cinder of generation of cave section coal seam is fallen into well caving completion pit shaft; well caving completion section wellbore is protected; cave section or less wellbore pocket is protected simultaneously; improve hole stability, it is ensured that the normal use of well caving completion pit shaft.
Description
Technical field
This application involves Coal-seam Gas Recovery Technologies field more particularly to a kind of wellbore protective device and methods.
Background technology
Coal bed gas is with methane hydrocarbon gas as main component, and also known as coal bed methane gas, coal industry is referred to as coal seam
Gas, be in coalification course formed and preservation in a kind of Unconventional gas in coal seam.This natural gas it is most of (70%~
90%) preservation is a small amount of to be present in hugger and other holes, the crack of coal in free state on coal petrography internal pore surface, also
Have and is dissolved in coal seam water a little.
Currently the exploitation of coal bed gas can be carried out in the producing well of well caving completion, wherein producing well can be straight well,
It can also be directional well.After the drilling well for completing producing well, well cementation is carried out by the producing well to formation and is realized to producing well
Protection, then carrying out completion makes producing well be connected to coal seam, and then carry out the exploitation of coal bed gas.
Usually before well cementation can the first tripping in casing in producing well, for convenience producing well is carried out to make well caving completion,
The casing of coal seam section is glass reinforced plastic sleeve, can make well caving completion at the glass reinforced plastic sleeve of coal seam section in this way, realizes producing well
With being connected to for coal seam.In above-mentioned well caving completion mode, since cave section coal seam is easily collapsed, and there is no protective device, lead to cave
Section wellbore and cave section are unstable with lower pocket, producing well may be made to lose effectiveness when serious.
Invention content
In order to solve the problems, such as that wellbore instability caused by the cave section coal seam of the prior art is collapsed, the embodiment of the present application carry
A kind of wellbore protective device and method are supplied.
The embodiment of the present application provides a kind of wellbore protective device, and described device is applied in well caving completion pit shaft, described
Device includes：Upper inner layer sleeve, support screen casing and lower inner layer sleeve；
Form hole on the support screen casing, the support screen pipe for connect the upper inner layer sleeve and it is described it is lower in
Layer casing；The support screen casing is applied to the cave section in the well caving completion pit shaft, and the upper inner layer sleeve is applied to described
Cave section top, the lower inner layer sleeve are applied to cave section lower section to the wellbore bottom.
Optionally, the density of described hole be every meter of 5~15 holes, a diameter of 30~150 millimeters of described hole.
Optionally, the length range of the upper inner layer sleeve is 10~100 meters.
Optionally, described device further includes tubing string, and the upper end of the lower end of the tubing string and the upper inner layer sleeve is by losing
Hand connector connects, and when described device is placed in the well caving completion pit shaft, the upper end of the tubing string is more than complete positioned at the cave
The well head of well shaft.
Optionally, the connection includes being threadedly coupled.
Optionally, if the support screen casing is connected by left-hand thread screw thread with the upper inner layer sleeve and the lower inner layer sleeve
It connects, the upper inner layer sleeve is threadedly coupled with the back-off sub by left-hand thread, then the tubing string passes through with the back-off sub
Right-handed thread connects, and applies pressure to the upper inner layer sleeve will pass through, rotates clockwise the tubing string, described give up is made to connect
Head is detached from the upper inner layer sleeve；
If the support screen casing is connect by right-handed thread with the upper inner layer sleeve and the lower inner layer sleeve, described
Upper inner layer sleeve is connect with the back-off sub by right-handed thread, then the tubing string passes through left-hand thread screw thread with the back-off sub
Connection applies pressure to the upper inner layer sleeve will pass through, rotates the tubing string counterclockwise, make the back-off sub with it is described
Upper inner layer sleeve is detached from.
Optionally, described sleeve pipe further includes leading shoes, and the shoes of leading are connected with the lower end of the lower inner layer sleeve, described to lead shoes
Lower end band chamfering.
The embodiment of the present application also provides a kind of wellbore means of defence, the method includes：
Combination forms wellbore protective device, and the wellbore protective device includes：Upper inner layer sleeve, support screen casing and lower internal layer
Casing；Hole is formed on the support screen casing, for connecting the upper inner layer sleeve and the lower inner layer sleeve；
The wellbore protective device is placed in well caving completion pit shaft, the support screen casing is made to be located at the well caving completion well
Cave section in cylinder, the lower inner layer sleeve are located at cave section lower section to the wellbore bottom, the upper inner layer sleeve position
In cave section top.
Optionally, described the wellbore protective device is placed in well caving completion pit shaft to include：
The wellbore protective device and tubing string are placed in well caving completion pit shaft, the lower end of the tubing string and the upper internal layer
The upper end of casing is connected by back-off sub, and the upper end of the tubing string is located at the well head of well caving completion pit shaft；
Act the tubing string and the back-off sub.
Optionally, if the support screen casing is connected by left-hand thread screw thread with the upper inner layer sleeve and the lower inner layer sleeve
It connects, the upper inner layer sleeve is threadedly coupled with the back-off sub by left-hand thread, and the tubing string passes through just with the back-off sub
Button is threadedly coupled, then described goes out the tubing string and the back-off sub, including：
Pressure is applied to the upper inner layer sleeve, rotates clockwise the tubing string, make the back-off sub with it is described it is upper in
Layer casing is detached from, and above carries the tubing string, with the back-off sub for acting the tubing string and being connect with the tubing string；
If the support screen casing is connect with the upper inner layer sleeve by right-handed thread, the support screen casing with it is described it is lower in
Layer casing is connected by right-handed thread, and the upper inner layer sleeve is connect with the back-off sub by right-handed thread, the tubing string
It is threadedly coupled by left-hand thread with the back-off sub, then described goes out the tubing string and the back-off sub, including：
Pressure is applied to the upper inner layer sleeve, rotates the tubing string counterclockwise, make the back-off sub with it is described it is upper in
Layer casing is detached from, and above carries the tubing string, with the back-off sub for acting the tubing string and being connect with the tubing string.
In wellbore protective device provided by the embodiments of the present application and method, wellbore protective device is applied to well caving completion pit shaft
In, which includes：Upper inner layer sleeve, support screen casing and lower inner layer sleeve；Wherein, support screen pipe is for connecting inner layer sleeve
It with lower inner layer sleeve, supports and forms hole on screen casing, support screen casing is applied to the cave section in well caving completion pit shaft, upper internal layer
Casing is applied to cave section top, and lower inner layer sleeve is applied to cave section lower section to the bottom of well caving completion pit shaft.By the well
After eye protective device is placed in well caving completion pit shaft, well caving completion pit shaft can pass through the hole on the support screen casing of cave section
Hole is connected to coal seam, and simultaneously supporting screen casing can stop that the collapse coal cinder of generation of cave section coal seam is fallen into well caving completion pit shaft,
Well caving completion section wellbore is protected, while cave section or less wellbore pocket is protected, improves hole stability, it is ensured that
The normal use of well caving completion pit shaft.
Description of the drawings
In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments described in application, for those of ordinary skill in the art, without creative efforts,
It can also be obtained according to these attached drawings other attached drawings.
Fig. 1 is a kind of structure diagram of wellbore protective device provided by the embodiments of the present application；
Fig. 2 is the structure diagram of another wellbore protective device provided by the embodiments of the present application；
Fig. 3 is the structural schematic diagram of back-off sub provided by the embodiments of the present application；
Fig. 4 is a kind of flow chart of wellbore means of defence provided by the embodiments of the present application.
Specific implementation mode
In order to make those skilled in the art more fully understand application scheme, below in conjunction in the embodiment of the present application
Attached drawing, technical solutions in the embodiments of the present application are clearly and completely described, it is clear that described embodiment is only this
Apply for a part of the embodiment, instead of all the embodiments.Based on the embodiment in the application, those of ordinary skill in the art exist
The every other embodiment obtained under the premise of creative work is not made, shall fall in the protection scope of this application.
In the prior art, it to the exploitation of coal bed gas, can be carried out in the producing well of well caving completion, and producing well is completed
After drilling well, it will usually cement the well after tripping in casing, then to producing well carry out completion so as to producing well and, it is complete for the ease of making cave
Well, casing are glass reinforced plastic pipe in coal seam section, can make well caving completion at glass reinforced plastic sleeve in this way, realize producing well and coal seam
Connection.But in this completion mode, glass reinforced plastic sleeve is destroyed, the pit shaft of producing well is directly connected to coal seam, is produced in coal seam
When life is collapsed, coal cinder can be fallen into pit shaft, may block coal seam section wellbore, cause the capacity efficiency of producing well low, meanwhile,
When due to making well caving completion, glass reinforced plastic sleeve is destroyed, causes not connect between casing and setting of casing, coal seam is collapsed seriously
When, may result in cave section wellbore pocket below and be staggered with wellbore center, equally make the generation tubing string of exploiting coal bed methane without
Method is transferred, and producing well is caused to lose effectiveness.
In order to solve the above-mentioned technical problem, refering to what is shown in Fig. 1, being a kind of wellbore protective device provided by the embodiments of the present application
Structural schematic diagram, which is applied in well caving completion pit shaft, which includes upper inner layer sleeve 101, support screen casing 102 and
Lower inner layer sleeve 103, wherein forming hole on support screen casing 102, support screen casing 102 is for connecting 101 He of inner layer sleeve
Lower inner layer sleeve 103, support screen casing 102 are applied to cave section 104, and upper inner layer sleeve 101 is applied to 104 top of cave section, under
Inner layer sleeve 103 is applied to 104 lower section of cave section to well caving completion wellbore bottom.
Upper inner layer sleeve 101 is the casing to shield to the pit shaft of 104 or more cave section in well caving completion pit shaft,
Material can be steel, and grade of steel for example can be N80, it is generally the case that in order to preferably play a protective role, upper inner layer sleeve
101 outer diameter can be slightly less than the internal diameter size of producing well.The upper end of upper inner layer sleeve 101 can be located in well caving completion pit shaft
Cave section 104 with shallow, the length range of upper inner layer sleeve 101 can be 10 meters to 100 meters, specifically, can be 50 meters.Tool
During body is implemented, the length of upper inner layer sleeve 101 can enable inner layer sleeve 101 preferably to rise depending on actual conditions
To the effect of the pit shaft of 104 or more protection cave section.
Lower inner layer sleeve 103 is to the casing that cave 104 pit shafts below of section shield in well caving completion pit shaft, class
Than can also be steel in the material of upper inner layer sleeve 101, lower inner layer sleeve 103, grade of steel for example can be N80, lower internal layer set
The outer diameter of pipe 103 can be slightly less than the internal diameter size of producing well.Lower inner layer sleeve 103 can be had with upper inner layer sleeve 101
The casing of same material and identical bore, it is possibility to have institute's difference.Lower 103 lower end of inner layer sleeve is located at well caving completion pit shaft bottom
Portion, the length of lower inner layer sleeve 103 can determine according to wellbore bottom at a distance from 104 bottoms of section of cave, can and wellbore bottom
With cave section 104 bottoms at a distance from it is roughly equal.
It is the pipe to form hole to support screen casing 102, is located at producing well cave section 104, since cave section 104 is located at coal seam
Coal seam can be connected to by section by the hole of support screen casing 102 with producing well, when being exploited to the coal bed gas in coal seam,
Can utilize pump by support screen casing 102 hole by coal seam water and coal bed gas extract out, realize the exploitation of coal bed gas.
Support screen casing 102 can also separate coal seam and producing well, and the collapse coal cinder of generation of coal seam will not pass through cave
Section 104 is fallen into the pit shaft in producing well under cave section 104, saves the step of carrying out pit shaft cleaning, is also avoided because of well
The risk that coal seam is collapsed again caused by cylinder cleaning.
Meanwhile supporting screen casing 102 for connecting inner layer sleeve 101 and lower inner layer sleeve 103, it is equivalent to upper internal layer set
Pipe 101 and lower inner layer sleeve 103 play fixed function, occur in well caving completion pit shaft more serious when collapsing, and can also avoid
Upper inner layer sleeve 101 and lower inner layer sleeve 103 misplace, and causing can not tripping in for realizing the flow string of coal-bed gas exploitation
To the problem of causing production well capacity lowly even to be scrapped in 104 pit shafts below of section of cave.
It can be steel to support the material of screen casing 102, and grade of steel for example can be N80, support the outer diameter of screen casing 102 can be with
Upper inner layer sleeve 101 and lower inner layer sleeve 103 are identical, can also be by smaller difference, not influence to be connected as standard.Support screen
Aperture density on pipe 102 can be every meter of 5~15 holes, can be specially every meter of 10 holes, the diameter of hole can be 30~150
Millimeter, can be specially 60 millimeters.To protect cave section as far as possible under the premise of not influencing coal-bed gas exploitation efficiency
104.The length of screen casing 102 is supported to be determined according to the length of cave section 104, generally at 5 meters to 15 meters, specifically, can be 9
Rice.
Upper inner layer sleeve 101, support screen casing 102 and lower inner layer sleeve 103 can be placed in the middle to well caving completion pit shaft, convenient for carrying
Protective action of the height to cave section wellbore.
Connection between upper inner layer sleeve 101 and support screen casing 102, lower inner layer sleeve 103 and support screen casing 102 can be with
It is connected through a screw thread.Specifically, the lower end of upper inner layer sleeve 101 can be connect with the threaded upper ends of support screen casing 102, support screen
The lower end of pipe 102 can be connect with the threaded upper ends of lower inner layer sleeve 103.The mode of threaded connection can be connected by right-hand thread,
It can also be connected by left-hand thread, wherein connecting left-hand thread, need to screw in counterclockwise, screwed out clockwise, right-hand thread is connected, needed
It to screw in, screw out counterclockwise clockwise.
For example, the lower end of upper inner layer sleeve 101 can be 51/2" left-hand thread pin thread, support the upper end of screen casing 102 can be with
It is 51/2" left-hand thread female thread, the threaded connection of inner layer sleeve 101 and support screen casing 102, similar in realization, support screen casing 102
Lower end is 51/2" upper end of left-hand thread pin thread, lower inner layer sleeve 103 is 51/2" left-hand thread female thread realizes support screen casing 102 and lower internal layer
The threaded connection of casing 103.
Connection before upper inner layer sleeve 101 and support screen casing 102, lower inner layer sleeve 103 and support screen casing 102 can also
By other means, for example, welding etc. forms, do not illustrate herein.
Wellbore protective device provided by the present application can also include tubing string 105, refering to what is shown in Fig. 2, Fig. 2 provides for the application
Another wellbore protective device, wherein the upper end of tubing string 105 and upper inner layer sleeve 101 is connected by back-off sub 106, is being incited somebody to action
When above-mentioned wellbore protective device is placed in well caving completion pit shaft, the upper end of tubing string 105 is located at the well head of well caving completion pit shaft.At this
Apply in embodiment, it, can be by the way that casing be placed in well to control to tubing string 105 in the decentralization process to wellbore protective device
Progress in cylinder, and then the accuracy of device decentralization can be improved.
Tubing string 105 can be oil pipe, can also be that inner layer sleeve 101,102 and of support screen casing are put under other can be used in
The metal tube of lower inner layer sleeve 103.
Back-off sub 106 can be with refering to what is shown in Fig. 3, its lower end 1062 can be pin thread, upper end 1061 can be female thread.It loses
Connection between hand connector 106 and upper inner layer sleeve 101, between back-off sub 106 and tubing string 105 can also be connected by screw thread
It connects, such as can be right-handed thread connection, can also be that left-hand thread is threadedly coupled.
For the ease of above-mentioned upper inner layer sleeve 101, support screen casing 102 and lower inner layer sleeve 103 are placed in well caving completion well
In cylinder, when specific implementation, if support screen casing 102 is connected by left-hand thread screw thread with upper inner layer sleeve 101 and lower inner layer sleeve 103
It connects, upper inner layer sleeve 101 is threadedly coupled with back-off sub 106 by left-hand thread, then tubing string 105 can pass through with back-off sub 106
Right-handed thread connects.It in this case, can be by being applied to upper inner layer sleeve 101 after wellbore protective device being placed in pit shaft
Plus-pressure, to increase upper inner layer sleeve 101 and support the connection between screen casing 102, support screen casing 102 and lower inner layer sleeve 103
Intensity.Inner layer sleeve 101 can be kept gradually de- with back-off sub 106 by rotating clockwise tubing string 105 outside pit shaft again
From, and the connection at other positions is unaffected or fastens.After rotating 105 predetermined amount of tubing string, upper lifting pipe post 105, to rise
Go out tubing string 105 and the back-off sub being connect with tubing string 105 106.Upper inner layer sleeve 101,102 and of support screen casing being placed in pit shaft
Lower inner layer sleeve 103 can be to cave 104 protective actions of section in well caving completion pit shaft.
For example, the upper end of lower inner layer sleeve 103 is 51/2" lower end of left-hand thread female thread, support screen casing 102 is 51/2It is " anti-
Pin thread is detained, lower inner layer sleeve 103 is formed and is threadedly coupled with the left-hand thread of support screen casing 102, the upper end of support screen casing 102 can be
51/2" lower end of left-hand thread female thread, upper inner layer sleeve 101 can be 51/2" left-hand thread pin thread, form support screen casing 102 and upper internal layer set
The left-hand thread of pipe 101 is threadedly coupled, and the upper end of upper inner layer sleeve 101 is 51/2" left-hand thread female thread, the lower end of back-off sub 106 is 51
/2" left-hand thread pin thread, inner layer sleeve 101 is threadedly coupled with the left-hand thread of back-off sub 106 in formation, then the upper end of back-off sub 106
Can be 27/8" right-hand thread female thread, the lower end of tubing string 105 can be 27/8" right-hand thread pin thread, form back-off sub 106 and tubing string 105
Between right-handed thread connection.
Upper inner layer sleeve, lower inner layer sleeve and support screen casing may be approximately equal to the pressure size that upper inner layer sleeve applies
The sum of gravity, can also be other pressure values, do not limit herein.
Similar, if support screen casing 102 is connect by right-handed thread with upper inner layer sleeve 101 and lower inner layer sleeve 103,
Upper inner layer sleeve 101 is connect with back-off sub 106 by right-handed thread, then tubing string 105 can pass through left-hand thread with back-off sub 106
It is threadedly coupled.In this case, it after wellbore protective device being placed in pit shaft, can be pressed by applying to upper inner layer sleeve 101
Power, to increase upper inner layer sleeve 101 and support the bonding strength between screen casing 102, support screen casing 102 and lower inner layer sleeve 103.
Inner layer sleeve 101 can be made to be progressively disengaged with back-off sub 106 by rotating tubing string 105 counterclockwise outside pit shaft again, and
The connection at other positions is unaffected or fastens, thus after rotating 105 predetermined amount of tubing string, upper lifting pipe post 105, to rise
Tubing string 105 and the back-off sub 106 being connect with tubing string 105.Be placed in the upper inner layer sleeve 101 in pit shaft, support screen casing 102 and under
Inner layer sleeve 103 can be to cave 104 protective actions of section in well caving completion pit shaft.
It, can also be by the way that upper thread connecting mode between inner layer sleeve 101 and back-off sub 106 be arranged when specific implementation
It is different from the thread connecting mode at other positions, thus can be by tubing string 105 and back-off sub 106 when rotating tubing string 105
It rises simultaneously, does not do exemplary illustration herein.
The material of above-mentioned back-off sub 106 and tubing string 105 may each be steel, and grade of steel for example can be N80.
Wellbore protective device provided by the present application can also include leading shoes 107, refering to what is shown in Fig. 2, leading shoes 107 and lower internal layer
The lower end of casing 103 connects, and the lower end band chamfering of shoes 107 is led, convenient for transferring wellbore protective device into well caving completion pit shaft.
It can be threadedly coupled that shoes 107, which are led, with the connection type of the lower end of lower inner layer sleeve 103, and the direction being threadedly coupled can be under
Inner layer sleeve 103 is identical with the support connection type of screen casing 102, such as lower inner layer sleeve 103 and the connection side for supporting screen casing 102
Formula is threadedly coupled for left-hand thread, and it can also be that left-hand thread is threadedly coupled to lead shoes 107 with the connection type of the lower end of lower inner layer sleeve 103.
Specifically, the upper end for leading shoes 107 can be 51/2" left-hand thread female thread, the lower end of lower inner layer sleeve 103 can be 51/2" left-hand thread public affairs
Button is threadedly coupled to which shoes 107 are led in formation with the left-hand thread of the lower end of lower inner layer sleeve 103.
In wellbore protective device provided by the embodiments of the present application, wellbore protective device is applied in well caving completion pit shaft, should
Device includes：Upper inner layer sleeve, support screen casing and lower inner layer sleeve；Wherein, support screen pipe is for connecting inner layer sleeve under
Inner layer sleeve supports and forms hole on screen casing, and support screen casing is applied to the cave section in well caving completion pit shaft, upper inner layer sleeve
Applied to cave section top, lower inner layer sleeve is applied to cave section lower section to the bottom of well caving completion pit shaft.Prevent by the wellbore
After protection unit is placed in well caving completion pit shaft, well caving completion pit shaft can by positioned at cave section support screen casing on hole with
Coal seam is connected to, and simultaneously supporting screen casing can stop that the collapse coal cinder of generation of cave section coal seam is fallen into well caving completion pit shaft, to hole
Cave well completion section wellbore is protected, while being protected to cave section or less wellbore pocket, improves hole stability, it is ensured that cave
The normal use of completion pit shaft.
Based on a kind of wellbore protective device that above example provides, the embodiment of the present application also provides a kind of protection of wellbore
Its operation principle is described in detail below in conjunction with the accompanying drawings in method.
The flow chart for the method that text fragments provided by the embodiments of the present application are retrieved is shown with reference to figure 4, this method includes
Following steps.
S401, combination form wellbore protective device.
Wellbore protective device includes：Upper inner layer sleeve 101, support screen casing 102 and lower inner layer sleeve 103；Support screen casing 102
Hole is formed, for connecting upper inner layer sleeve 101 and lower inner layer sleeve 103.
Support screen casing 102 can be connected through a screw thread with upper inner layer sleeve 101 and lower inner layer sleeve 103, such as left-hand thread
It is threadedly coupled or right-handed thread connects.Upper inner layer sleeve 101, support screen casing 102 and the material of lower inner layer sleeve 103 can be
Steel, grade of steel for example can be N80.
Wellbore protective device is applied in well caving completion pit shaft by S402.
Wellbore protective device is placed in well caving completion pit shaft, support screen casing 102 is made to be located at the hole in well caving completion pit shaft
Cave section 104, lower inner layer sleeve 103 are located at 104 lower section of cave section to well caving completion wellbore bottom, and upper inner layer sleeve 101 is located at hole
104 top of cave section.
It is the pipe to form hole to support screen casing 102, is located at producing well cave section 104, since cave section 104 is located at coal seam
Coal seam can be connected to by section by the hole of support screen casing 102 with producing well, when being exploited to the coal bed gas in coal seam,
Can utilize pump by support screen casing 102 hole by coal seam water and coal bed gas extract out, realize the exploitation of coal bed gas.
Support screen casing 102 can also separate coal seam and producing well, and the collapse coal cinder of generation of coal seam will not pass through cave
Section 104 is fallen into the pit shaft in producing well under cave section 104, saves the step of carrying out pit shaft cleaning, is also avoided because of well
The risk that coal seam is collapsed again caused by cylinder cleaning.
Meanwhile supporting screen casing 102 for connecting inner layer sleeve 101 and lower inner layer sleeve 103, it is equivalent to upper internal layer set
Pipe 101 and lower inner layer sleeve 103 play fixed function, occur in well caving completion pit shaft more serious when collapsing, and can also avoid
Upper inner layer sleeve 101 and lower inner layer sleeve 103 misplace, and causing can not for realizing the flow string 105 of coal-bed gas exploitation
Cause to produce the problem of well capacity is lowly even scrapped in tripping in cave 104 pit shafts below of section.
Specifically, including applied to well caving completion pit shaft by wellbore protective device：
Wellbore protective device and tubing string 105 are placed in well caving completion pit shaft, tubing string 105 is upper with upper inner layer sleeve 101
End is connected by back-off sub 106, and the upper end of tubing string 105 is located at the well head of well caving completion pit shaft, acts tubing string 105 and give up connecing
First 106.
Tubing string 105 can be oil pipe, can also be that inner layer sleeve 101,102 and of support screen casing are put under other can be used in
The metal tube of lower inner layer sleeve 103.
As a kind of possible embodiment, if support screen casing 102 and upper inner layer sleeve 101 and lower inner layer sleeve 103 are equal
It is threadedly coupled by left-hand thread, upper inner layer sleeve 101 is threadedly coupled with back-off sub 106 by left-hand thread, tubing string 105 and back-off sub
106 are connected by right-handed thread, then play out tubing string 105 and back-off sub 106, including：Pressure is applied to upper inner layer sleeve 101,
Tubing string 105 is rotated clockwise, back-off sub 106 is made to be detached from upper inner layer sleeve 101, upper lifting pipe post 105, to act tubing string 105
With the back-off sub 106 being connect with tubing string 105.
As alternatively possible embodiment, if support screen casing 102 is connected with upper inner layer sleeve 101 by right-handed thread
It connects, support screen casing 102 is connect with lower inner layer sleeve 103 by right-handed thread, and upper inner layer sleeve 101 passes through with back-off sub 106
Right-handed thread connects, and tubing string 105 is threadedly coupled with back-off sub 106 by left-hand thread, then plays out tubing string 105 and back-off sub 106,
Including：Pressure is applied to upper inner layer sleeve 101, rotates tubing string 105 counterclockwise, keeps back-off sub 106 de- with upper inner layer sleeve 101
From the tubing string 105 above being carried, to act tubing string 105 and the back-off sub 106 that is connect with tubing string 105.
In wellbore means of defence provided by the embodiments of the present application, first combination forms wellbore protective device, which includes：On
Inner layer sleeve, support screen casing and lower inner layer sleeve；Wherein, support screen pipe is propped up for connecting inner layer sleeve and lower inner layer sleeve
Hole is formed on support screen casing, then wellbore protective device is placed in well caving completion pit shaft, support screen casing is made to be located at well caving completion
Cave section in pit shaft, lower inner layer sleeve are located at cave section lower section to the bottom of well caving completion pit shaft, and upper inner layer sleeve is located at hole
Cave section top.After the wellbore protective device is placed in well caving completion pit shaft, well caving completion pit shaft can be by being located at cave
Hole on the support screen casing of section is connected to coal seam, and simultaneously supporting screen casing can stop that the collapse coal cinder of generation of cave section coal seam falls
Enter in well caving completion pit shaft, well caving completion section wellbore is protected, while cave section or less wellbore pocket is protected, carries
High hole stability, it is ensured that the normal use of well caving completion pit shaft.
When introducing the element of various embodiments of the application, article "a", "an", "this" and " described " are intended to
There are one expressions or multiple element.Word "include", "comprise" and " having " are all inclusive and mean in addition to listing
Except element, there can also be other elements.
It should be noted that one of ordinary skill in the art will appreciate that realizing the whole in above method embodiment or portion
Split flow is relevant hardware can be instructed to complete by computer program, and the program can be stored in a computer
In read/write memory medium, the program is when being executed, it may include such as the flow of above-mentioned each method embodiment.Wherein, the storage
Medium can be magnetic disc, CD, read-only memory (Read-Only Memory, ROM) or random access memory (Random
Access Memory, RAM) etc..
Each embodiment in this specification is described in a progressive manner, identical similar portion between each embodiment
Point just to refer each other, and each embodiment focuses on the differences from other embodiments.Especially for device reality
For applying example, since it is substantially similar to the method embodiment, so describing fairly simple, related place is referring to embodiment of the method
Part explanation.The apparatus embodiments described above are merely exemplary, wherein described be used as separating component explanation
Unit and module may or may not be physically separated.Furthermore it is also possible to select according to the actual needs it
In some or all of unit and module achieve the purpose of the solution of this embodiment.Those of ordinary skill in the art are not paying
In the case of creative work, you can to understand and implement.
The above is only the specific implementation mode of the application, it is noted that for the ordinary skill people of the art
For member, under the premise of not departing from the application principle, several improvements and modifications can also be made, these improvements and modifications are also answered
It is considered as the protection domain of the application.
Claims (10)
1. a kind of wellbore protective device, which is characterized in that described device is applied in well caving completion pit shaft, and described device includes：
Upper inner layer sleeve, support screen casing and lower inner layer sleeve；
Hole is formed on the support screen casing, the support screen pipe is for connecting the upper inner layer sleeve and the lower internal layer set
Pipe；The support screen casing is applied to the cave section in the well caving completion pit shaft, and the upper inner layer sleeve is applied to the cave
Duan Shangfang, the lower inner layer sleeve are applied to cave section lower section to the wellbore bottom.
2. the apparatus according to claim 1, which is characterized in that the density of described hole is every meter of 5~15 holes, described hole
A diameter of 30~150 millimeters.
3. the apparatus according to claim 1, which is characterized in that the length range of the upper inner layer sleeve is 10~100 meters.
4. according to the device described in claims 1 to 3 any one, which is characterized in that described device further includes tubing string, the pipe
The lower end of column is connect with the upper end of the upper inner layer sleeve by back-off sub, and described device is placed in the well caving completion pit shaft
When, the upper end of the tubing string is located at the well head of the well caving completion pit shaft.
5. device according to claim 4, which is characterized in that the connection includes being threadedly coupled.
6. device according to claim 5, which is characterized in that if the support screen casing and the upper inner layer sleeve and described
Lower inner layer sleeve is threadedly coupled by left-hand thread, and the upper inner layer sleeve is threadedly coupled with the back-off sub by left-hand thread, then
The tubing string is connect with the back-off sub by right-handed thread, applies pressure, up time to the upper inner layer sleeve will pass through
Needle rotates the tubing string, and the back-off sub is made to be detached from the upper inner layer sleeve；
It is described interior if the support screen casing is connect by right-handed thread with the upper inner layer sleeve and the lower inner layer sleeve
Layer casing is connect with the back-off sub by right-handed thread, then the tubing string is connected with the back-off sub by left-hand thread screw thread
Connect, pressure applied to the upper inner layer sleeve will pass through, rotates the tubing string counterclockwise, make the back-off sub with it is described on
Inner layer sleeve is detached from.
7. the apparatus according to claim 1, which is characterized in that described sleeve pipe further includes leading shoes, it is described lead shoes with it is described under
The lower end of inner layer sleeve is connected, described to lead shoes lower end band chamfering.
8. a kind of wellbore means of defence, which is characterized in that the method includes：
Combination forms wellbore protective device, and the wellbore protective device includes：Upper inner layer sleeve, support screen casing and lower internal layer set
Pipe；Hole is formed on the support screen casing, for connecting the upper inner layer sleeve and the lower inner layer sleeve；
The wellbore protective device is placed in well caving completion pit shaft, the support screen casing is made to be located in the well caving completion pit shaft
Cave section, the lower inner layer sleeve be located at the cave section below to the wellbore bottom, the upper inner layer sleeve is located at institute
State cave section top.
9. according to the method described in claim 8, it is characterized in that, described be placed in well caving completion well by the wellbore protective device
Cylinder include：
The wellbore protective device and tubing string are placed in well caving completion pit shaft, the lower end of the tubing string and the upper inner layer sleeve
Upper end connected by back-off sub, the upper end of the tubing string is located at the well head of the well caving completion pit shaft；
Act the tubing string and the back-off sub.
10. if according to the method described in claim 9, it is characterized in that, the support screen casing and the upper inner layer sleeve and institute
Lower inner layer sleeve to be stated to be threadedly coupled by left-hand thread, the upper inner layer sleeve is threadedly coupled with the back-off sub by left-hand thread,
The tubing string is connect with the back-off sub by right-handed thread, then described goes out the tubing string and the back-off sub, including：
Pressure is applied to the upper inner layer sleeve, the tubing string is rotated clockwise, makes the back-off sub and the upper internal layer set
Pipe is detached from, and above carries the tubing string, with the back-off sub for acting the tubing string and being connect with the tubing string；
If the support screen casing is connect with the upper inner layer sleeve by right-handed thread, the support screen casing and the lower internal layer set
Pipe is connected by right-handed thread, and the upper inner layer sleeve is connect with the back-off sub by right-handed thread, the tubing string and institute
Back-off sub is stated to be threadedly coupled by left-hand thread, then described goes out the tubing string and the back-off sub, including：
Pressure is applied to the upper inner layer sleeve, the tubing string is rotated counterclockwise, makes the back-off sub and the upper internal layer set
Pipe is detached from, and above carries the tubing string, with the back-off sub for acting the tubing string and being connect with the tubing string.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810349915.1A CN108590597A (en) | 2018-04-18 | 2018-04-18 | A kind of wellbore protective device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810349915.1A CN108590597A (en) | 2018-04-18 | 2018-04-18 | A kind of wellbore protective device and method |
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| CN108590597A true CN108590597A (en) | 2018-09-28 |
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| CN201810349915.1A Pending CN108590597A (en) | 2018-04-18 | 2018-04-18 | A kind of wellbore protective device and method |
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| US4353417A (en) * | 1980-11-28 | 1982-10-12 | Texaco Inc. | Method for producing a well in an unconsolidated formation |
| CN102561998A (en) * | 2010-12-10 | 2012-07-11 | 淮南矿业(集团)有限责任公司 | Gas extraction bored well and forming method |
| CN102767349A (en) * | 2012-07-12 | 2012-11-07 | 中国石油天然气股份有限公司 | Completion method for suspending sieve tube in coal bed gas horizontal well |
| CN202628163U (en) * | 2012-04-10 | 2012-12-26 | 张巨峰 | Soft coal seam gas pressure relief pumping extraction device for ground well drilling |
| CN207063915U (en) * | 2017-07-12 | 2018-03-02 | 中国石油化工股份有限公司 | A kind of tubing string for being used to support Open-Hole Section |
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2018
- 2018-04-18 CN CN201810349915.1A patent/CN108590597A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4353417A (en) * | 1980-11-28 | 1982-10-12 | Texaco Inc. | Method for producing a well in an unconsolidated formation |
| CN102561998A (en) * | 2010-12-10 | 2012-07-11 | 淮南矿业(集团)有限责任公司 | Gas extraction bored well and forming method |
| CN202628163U (en) * | 2012-04-10 | 2012-12-26 | 张巨峰 | Soft coal seam gas pressure relief pumping extraction device for ground well drilling |
| CN102767349A (en) * | 2012-07-12 | 2012-11-07 | 中国石油天然气股份有限公司 | Completion method for suspending sieve tube in coal bed gas horizontal well |
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