CN207169186U - Sectionally assembled Hydraulic Fracturing Stress Measurements filter - Google Patents
Sectionally assembled Hydraulic Fracturing Stress Measurements filter Download PDFInfo
- Publication number
- CN207169186U CN207169186U CN201721111183.XU CN201721111183U CN207169186U CN 207169186 U CN207169186 U CN 207169186U CN 201721111183 U CN201721111183 U CN 201721111183U CN 207169186 U CN207169186 U CN 207169186U
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- filter
- hydraulic fracturing
- stress measurements
- assembled hydraulic
- hollow
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Abstract
Geostress survey technical field is the utility model is related to, more particularly, to a kind of sectionally assembled Hydraulic Fracturing Stress Measurements filter.Sectionally assembled Hydraulic Fracturing Stress Measurements filter includes hollow pipe column, first filter and the second filter；The first filter and second filter are hollow cylinder；Second filter is set in the outside of the first filter；One end of the first filter is connected with one end of the hollow pipe column.Sectionally assembled Hydraulic Fracturing Stress Measurements filter provided by the utility model, after simply assembling, classified filtering can be carried out, avoid iron rust and enter push-and-pull switch, ensure that being smoothed out for test；Blocking of the chemical grease to filter opening is avoided, ensure that liquid can normally enter push-and-pull switch, ensures being smoothed out for test.
Description
Technical field
Geostress survey technical field is the utility model is related to, more particularly, to a kind of sectionally assembled hydrofracturing stress
Measure filter.
Background technology
Crustal stress is the primary stress being present in earth's crust rock mass, and solid earth important physical property parameters it
One.Crustal stress is the root strength for causing rock mass deformation, unstability and destruction, thus the measurement for carrying out crustal stress is operated in earthquake machine
Reason research, mining tunnel design, large-scale dam dam foundation construction etc. have important scientific meaning.
The most important method of geostress survey is hydraulic fracturing.Hydraulic fracturing geostress survey is by the borehole
One section of rock open-hole is insulated, to packing section injection highly pressurised liquid, makes hole wall fracturing section rock mass that rupture occur to determine that crustal stress is big
A kind of small and method in direction.Party's law theory is ripe, it is easy to operate, fathom that big, cost is low, at present in worldwide
Inside it is widely used.For water pressure supporing dependent on drilling, drilling average diameters tens are deep several to hundreds of centimetres
Ten meters to several kilometers.
Hydraulic Fracturing Stress Measurements use the passage of geology or oil drill rocker as highly pressurised liquid.Liquid is entered by drilling rod
Underground push-and-pull switch.Push-and-pull switch is the core instrument of two kinds of key operations conversions of the setting and pressure break of control, has a row inside it
Tiny eyelet enters the passage of packer and open-hole fracturing section as highly pressurised liquid from drilling rod, while has multiple tracks precision machined resistance to
High-pressure seal ring is as baffle, the core component for preventing highly pressurised liquid from ganging up.Ideally, hydraulic pressure is carried out in the borehole
The geostress survey of fracturing method needs clean clear water as fracturing liquid.Under current common situation, to avoid impurity from blocking push-and-pull
Switch, generally in drilling rod end and push-and-pull switch junction, place a Simple filter pipe.Screen pipe is mesopore plastic tube, pipe
Beating some duck eyes week prevents silt etc. in water from entering push-and-pull switch.
Due to field complex geological condition and the limitation of various reality constructions, be difficult to provide in many cases it is clean, after
Water source of the person containing a small amount of silt.
Current filter pipe is difficult to solve following three major issues：
1) because liquid of drilling has corrosivity, drilling rod inwall peels off a large amount of iron rust, and existing screen pipe can not limit one
A little trickle iron rust enter push-and-pull switch, in turn result in iron rust and scratch, isolate fluorination high-pressure-resistant sealed circle, cause test crash；
2) some water sources contain chemical substance, these greases such as butter, saponification (oil) liquid can adsorb various impurity in water,
Assemble it is agglomerating, and then block and be attached to outside screen pipe, block aperture completely, liquid is caused from entering push-and-pull switch
Measurement failure；
3) in measurement process, the anti-water that flows back to of fracturing section has certain pressure, and this High-Pressure Water returns by screen pipe
When returning in drilling rod, the impurity such as the silt for being deposited in screen pipe and drilling rod annulus bottom position, the impurity of suspension can be kicked up
It is possible to be again introduced into and block push-and-pull switch, causes secondary injury.As hydrofracturing drilling depth is more and more big, anti-draining
Pressure is bigger, and these problems also will be protruded more.
Utility model content
The purpose of this utility model is to provide a kind of sectionally assembled Hydraulic Fracturing Stress Measurements filter, existing to solve
There is technical problem present in technology.
Sectionally assembled Hydraulic Fracturing Stress Measurements filter provided by the utility model, including hollow pipe column, the first mistake
Filter and the second filter；
The first filter and second filter are hollow cylinder；
Second filter is set in the outside of the first filter；
One end of the first filter is connected with one end of the hollow pipe column.
Further, separation circle is provided with the first filter；
The separation circle is close to one end of the hollow pipe column and the hollow pipe column grafting；
Second filter is set in the described one end of separation circle away from the hollow pipe column.
Further, coordinate between second filter and the first filter for gap.
Further, the filter opening of the first filter is more than the filter opening of second filter；
The filter opening density of second filter is more than the filter opening density of the first filter.
Further, sectionally assembled Hydraulic Fracturing Stress Measurements filter also includes the 3rd filter；
3rd filter is hollow cylinder；
One end of 3rd filter is connected with the one end of the first filter away from the hollow pipe column.
Further, it is provided with least one hollow tubule on the outer wall of the 3rd filter；
The hollow tubule connects one to one with the filter opening on the 3rd filter.
Further, the hollow tubule is multiple rows of setting；
In hollow tubule described in same row, the axis angle of adjacent hollow tubule is 90 °.
Further, the adjacent hollow tubule is not at grade.
Further, the described one end of 3rd filter away from the first filter is provided with plug.
Further, the hollow pipe column is handled for hard magnetization.
Sectionally assembled Hydraulic Fracturing Stress Measurements filter provided by the utility model, can after simply assembling
Classified filtering is carried out, iron rust is avoided and enters push-and-pull switch, ensure that being smoothed out for test；Chemical grease is avoided to filter opening
Blocking, ensure that liquid can normally enter push-and-pull switch, ensure test be smoothed out.
Brief description of the drawings
, below will be to specific embodiment party in order to illustrate more clearly of the technical scheme in the utility model embodiment
The required accompanying drawing used is briefly described in formula description, it should be apparent that, drawings in the following description are the utility model
Some embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, can be with root
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the explosive view for the sectionally assembled Hydraulic Fracturing Stress Measurements filter that the utility model embodiment provides；
Fig. 2 is the hollow pipe column for the sectionally assembled Hydraulic Fracturing Stress Measurements filter that the utility model embodiment provides
Structural representation；
Fig. 3 is the first filtering of the sectionally assembled Hydraulic Fracturing Stress Measurements filter that the utility model embodiment provides
The structural representation of device；
Fig. 4 is the second filtering of the sectionally assembled Hydraulic Fracturing Stress Measurements filter that the utility model embodiment provides
The structural representation of device；
Fig. 5 is the 3rd filtering of the sectionally assembled Hydraulic Fracturing Stress Measurements filter that the utility model embodiment provides
The structural representation of device.
Reference：
1：Hollow pipe column；1-1：External screw thread；
2：First filter；2-1：First linkage section；2-2：Separation circle；2-3：Fillter section；2-4：First filter opening；
3：Second filter；3-1：Second filter opening；
4：3rd filter；4-1：Second linkage section；4-2：Hollow tubule；
5：Plug.
Embodiment
The technical solution of the utility model is clearly and completely described below in conjunction with accompanying drawing, it is clear that described
Embodiment is the utility model part of the embodiment, rather than whole embodiments.Based on the embodiment in the utility model, sheet
The every other embodiment that field those of ordinary skill is obtained under the premise of creative work is not made, belongs to this practicality
Novel protected scope.
, it is necessary to explanation in description of the present utility model, term " " center ", " on ", " under ", it is "left", "right", " perpendicular
Directly ", the orientation of the instruction such as " level ", " interior ", " outer " or position relationship are based on orientation shown in the drawings or position relationship, are only
Described for the ease of description the utility model and simplifying, rather than instruction or imply signified device or element must have it is specific
Orientation, with specific azimuth configuration and operation, therefore it is not intended that to limitation of the present utility model.
In addition, term " first ", " second ", " the 3rd " are only used for describing purpose, and it is not intended that instruction or implying phase
To importance.
, it is necessary to which explanation, unless otherwise clearly defined and limited, term " are pacified in description of the present utility model
Dress ", " connected ", " connection " should be interpreted broadly, for example, it may be fixedly connected or be detachably connected, or integratedly
Connection；Can be mechanical connection or electrical connection；Can be joined directly together, can also be indirectly connected by intermediary,
It can be the connection of two element internals.For the ordinary skill in the art, above-mentioned art can be understood with concrete condition
Concrete meaning of the language in the utility model.
As shown in accompanying drawing 1-5, the utility model provides a kind of sectionally assembled Hydraulic Fracturing Stress Measurements filter, bag
Include hollow pipe column 1, the filter 3 of first filter 2 and second；
The first filter 2 and second filter 3 are hollow cylinder；
Second filter 3 is set in the outside of the first filter 2；
One end of the first filter 2 is connected with one end of the hollow pipe column 1.
In the present embodiment, one end of hollow pipe column 1 is detachably connected with first filter 2 so that hollow pipe column 1 can
Quickly assembled with first filter 2, the other end is provided with external screw thread 1-1, can be by external screw thread 1-1 and other parts, such as
Push-and-pull switch connects.
In the present embodiment, the second filter 3 is set in the outside of first filter 2, can first pass through the second filter 3
After tentatively being come, first filter 2 is recycled to be filtered.
In the present embodiment, the second filter 3 is sieves.
When in use, after one end of hollow pipe column 1 is connected with first filter 2, side that the other end is connected through a screw thread
Formula is connected with push-and-pull switch, and the second filter 3 is set in first filter 2.When liquid passes through the second filter 3, first
Enter hollow pipe column 1 after filter 2, now liquid has already passed through filters twice, eliminates most impurity, ensure that liquid
Cleaning, avoid blocking of the impurity to push-and-pull switch, and then ensure that being smoothed out for test.
It is pointed out that in the present embodiment, the other end of hollow pipe column 1 is connected by external screw thread 1-1 and push-and-pull switch
Connect, but it is not limited solely to a kind of this connected mode, and it can also be other connected modes, such as can also be grafting,
That is, as long as hollow pipe column 1 can be removably fixedly connected with push-and-pull switch.
Preferred embodiment is that separation circle 2-2 is provided with the first filter 2；
The separation circle 2-2 is close to one end of the hollow pipe column 1 and the grafting of hollow pipe column 1；
Second filter 3 is set in the described one end of separation circle 2-2 away from the hollow pipe column 1.
In the present embodiment, be provided with first filter 2 separation circle 2-2, separation circle 2-2 both ends respectively with sky
The filter 3 of heart tubing string 1 and second connects.
In the present embodiment, separation circle 2-2 diameter is more than the diameter of first filter 2 so that separation circle 2-2 is first
The outer surface of filter 2 forms a circular boss.
In the present embodiment, one end of separator is the first linkage section 2-1, and for being connected with hollow pipe column 1, the other end is
Fillter section 2-3, for being filtered to liquid.
Preferred embodiment is to coordinate between second filter 3 and the first filter 2 for gap.
In the present embodiment, gap, i.e. the second filter 3 and are provided between the second filter 3 and first filter 2
Coordinate between one filter 2 for gap.
Such setting, the impurity for enabling to first filter 2 to filter down, first filter 2 and can be passed through
Gap discharge between tow filtrator 3, avoids resulting in blockage to the filter opening of the second filter 3.
It is pointed out that in the present embodiment, coordinate between the filter 3 of first filter 2 and second for gap, but its
It is not limited solely to gap and coordinates a kind of mode, it has can also be other connected modes, such as can be by the second filtering
One end of device 3 is fixedly connected or be threadedly coupled with separating circle 2-2, that is to say, that if can by the second filter 3 and
First filter 2 is fixed together, and is provided between the filter 3 of first filter 2 and second and be can allow for impurity
The gap passed through.
Preferred embodiment is that the filter opening of the first filter 2 is more than the filter opening of second filter 3；
The filter opening density of second filter 3 is more than the filter opening density of the first filter 2.
In the present embodiment, the filter opening in first filter 2 is the first filter opening 2-4, and the filter opening on the second filter 3 is the
Two filter opening 3-1.
In the present embodiment, diameter of the first filter opening 2-4 diameter more than the second filter opening 3-1, the first of first filter 2
Filter opening 2-4 density is less than the density of the second filter opening 3-1 on the second filter 3.Such setting, the second filter can be passed through
After 3 are filtered most impurity, secondary filter is carried out by first filter 2, can also avoid impurity will simultaneously
After first filter 2 blocks, first filter 2 can be entered by the gap between the filter 3 of first filter 2 and second
It is interior, filtered using the first filter opening 2-4 of first filter 2, to ensure that not having impurity enters in push-and-pull switch.
Preferred embodiment is that sectionally assembled Hydraulic Fracturing Stress Measurements filter also includes the 3rd filter 4；
3rd filter 4 is hollow cylinder；
One end of 3rd filter 4 is connected with the one end of the first filter 2 away from the hollow pipe column 1.
In the present embodiment, the 3rd filter 4 is additionally provided with, the filtering of more levels is carried out by the 3rd filter 4, with
Ensure there is no impurity in push-and-pull switch.
In the present embodiment, the 3rd filter 4 is also configured as the structure of hollow cylinder, the 3rd filter 4 and the first filtering
The one end of device 2 away from hollow pipe column 1 is detachably connected.
In the present embodiment, the 3rd filter 4 and the detachable connection of first filter 2 are grafting, i.e., the 3rd
The external diameter that the second linkage section 4-1, the second linkage section 4-1 is provided with filter 4 is less than the internal diameter of first filter 2, can incite somebody to action
Second linkage section 4-1 is inserted into the second filter 3.It is interference fit or mistake between second linkage section 4-1 and first filter 2
Cooperation is crossed, to ensure that it can be fixedly connected, without being separated when being filtered.
It is pointed out that in the present embodiment, the connected mode between the 3rd filter 4 and first filter 2 is slotting
Connect, but it is not limited solely to grafting, and it can also be other detachable connections, such as can also be threaded connection,
That is, the filter 4 of first filter 2 and the 3rd can be mainly fixed together i.e. by it by dismountable mode
Can.
In the present embodiment, between the filter 4 of first filter 2 and the 3rd for sealing, can avoid filtering after liquid
Body flows out between the filter 4 of first filter 2 and the 3rd, avoids and filters repeatedly, improves the efficiency of filtering.
Preferred embodiment is that at least one hollow tubule 4-2 is provided with the outer wall of the 3rd filter 4；
The hollow tubule 4-2 connects one to one with the filter opening on the 3rd filter 4.
In the present embodiment, multiple hollow tubule 4-2, and each hollow thin are provided with the outer wall of the 3rd filter 4
Filter opening on pipe 4-2 and the 3rd filter 4 carries out one-to-one corresponding setting, i.e., a hollow tubule is provided with each filter opening
4-2 so that hollow tubule 4-2 is connected with the 3rd filter 4 by filter opening.
Such set-up mode, it can effectively prevent from being entered in the 3rd filter 4 by the impurity that vortex current are kicked up,
Avoiding push-and-pull switch causes cumulative bad to block or injure, and ensure that the normal operation of push-and-pull switch.
Preferred embodiment is that the hollow tubule 4-2 is multiple rows of setting；
In hollow tubule 4-2 described in same row, adjacent hollow tubule 4-2 axis angle is 90 °.
In the present embodiment, hollow tubule 4-2 is arranged to four rows, and line is uniform centered on the axis of the 3rd filter 4
Arrangement.
In the present embodiment, each hollow tubule 4-2 axis and the axis of the 3rd filter 4 are 45 °, pass through folder
It the design at angle, effectively can prevent fine impurity from being stirred by current, avoid fine impurity and enter in the 3rd filter 4,
It ensure that the normal operation of push-and-pull switch.
In the present embodiment, in same row, the angle between adjacent two hollow tubule 4-2 is 90 °, i.e., adjacent sky
Between careful pipe 4-2, further prevent fine impurity from being stirred by current, avoid fine impurity and enter the 3rd filter
In 4, the normal operation of push-and-pull switch ensure that.
Preferred embodiment is, the adjacent hollow tubule 4-2 is not at grade.
In the present embodiment, the adjacent hollow tubule 4-2 in same row not at grade, so can be effective
Prevent fine impurity from being stirred by current, avoid fine impurity from entering in the 3rd filter 4, ensure the normal work of push-and-pull switch
While industry, additionally it is possible to do not influence liquid and normally enter in the 3rd filter 4, ensure that the normal operation of the 3rd filter 4.
Preferred embodiment is that the described one end of 3rd filter 4 away from the first filter 2 is provided with plug 5.
In the present embodiment, the 3rd one end of filter 4 away from first filter 2 is provided with plug 5, passes through plug 5
Set, the liquid after filtering can be avoided in turn result in filtering from one end outflow of the 3rd filter 4 away from first filter 2
Liquid afterwards is filtered again so that filter process repeatedly, and then provides the efficiency of filtering.
In the present embodiment, plug 5 is bolt, i.e., is provided with the 3rd one end of filter 4 away from first filter 2 interior
Screw thread, by bolt and screw-internal thread fit, enable to the 3rd one end of filter 4 away from first filter 2 to be sealed, keep away
The leakage of liquid is exempted from.
Preferred embodiment is that the hollow pipe column 1 is handled for hard magnetization.
From the above, it can be seen that the sectionally assembled Hydraulic Fracturing Stress Measurements filter after assembling is positioned over drilling rod inwall
Space, filter lower end are connected by the external screw thread 1-1 of hollow pipe column 1 with underground push-and-pull switch, wherein, hollow pipe column 1,
One filter 2, the second filter 3, the 3rd filter 4 and plug 5 can freely be dismantled, cleaned.
Most of bulky grain silt directly falls to the space of hollow pipe column 1 and drilling rod bottom, small part fine particle quilt
The filter 4 of first filter 2 and the 3rd stops, gradually sinks.
For the water source containing grease, after grease adsorbs the impurity such as silt, the second filter 3 and the 3rd can be attached to
The cylinder surface of filter 4, but the hollow tubule 4-2 on the surface of the 3rd filter 4 can still provide the passage in clean water route.
For seawater, containing a kind of corrosivity water source such as acid chemical, after drilling rod inwall may be corroded, drop big
The small iron rust not waited.The hollow pipe column 1 of hard magnetization processing can adsorb most of iron rust, and the trickle iron rust of fraction still may be to pushing away
Fluorination high-pressure-resistant sealed circle produces injury in drag switch, and the cylindrical outer surface of the 3rd filter 4 of weakly magnetization processing can be adsorbed
The trickle iron rust in this part.
During pressure break, high pressure backwater can the impurity such as inspired trickle silt for being deposited in the outside of hollow pipe column 1, in order to
Prevent fine impurity from being stirred by current, cause cumulative bad to block or injure, four rows on the surface of the 3rd filter 4 into push-and-pull switch
The hollow tubule 4-2 of opposing angular installation can cancel out each other local current whirlpool effect, effectively avoid airborne dust.
Each component of sectionally assembled Hydraulic Fracturing Stress Measurements filter carries out modularized design, and assembling is simple, can root
Use is combined according to specific special circumstances, also can locally double, lengthen.For example fall serious situation of becoming rusty for drilling rod,
Hollow pipe column 1 can be lengthened, and assemble and use together with the 3rd filter 4；, can be by sky for the more big deep drilling of impurity
Heart tubing string 1 lengthens；For containing the more water source of grease, the 3rd filter 4 can be doubled to lengthening etc..
Sectionally assembled Hydraulic Fracturing Stress Measurements filter provided by the utility model, can after simply assembling
Classified filtering is carried out, iron rust is avoided and enters push-and-pull switch, ensure that being smoothed out for test；Chemical grease is avoided to filter opening
Blocking, ensure that liquid can normally enter push-and-pull switch, ensure test be smoothed out.
Finally it should be noted that：Various embodiments above is only to illustrate the technical solution of the utility model, rather than it is limited
System；Although the utility model is described in detail with reference to foregoing embodiments, one of ordinary skill in the art should
Understand：It can still modify to the technical scheme described in foregoing embodiments, either to which part or whole
Technical characteristic carries out equivalent substitution；And these modifications or replacement, the essence of appropriate technical solution is departed from this practicality newly
The scope of each embodiment technical scheme of type.
Claims (10)
1. a kind of sectionally assembled Hydraulic Fracturing Stress Measurements filter, it is characterised in that including hollow pipe column, first filter
With the second filter；
The first filter and second filter are hollow cylinder；
Second filter is set in the outside of the first filter；
One end of the first filter is connected with one end of the hollow pipe column.
2. sectionally assembled Hydraulic Fracturing Stress Measurements filter according to claim 1, it is characterised in that described first
Separation circle is provided with filter；
The separation circle is close to one end of the hollow pipe column and the hollow pipe column grafting；
Second filter is set in the described one end of separation circle away from the hollow pipe column.
3. sectionally assembled Hydraulic Fracturing Stress Measurements filter according to claim 1, it is characterised in that described second
Coordinate between filter and the first filter for gap.
4. sectionally assembled Hydraulic Fracturing Stress Measurements filter according to claim 1, it is characterised in that described first
The filter opening of filter is more than the filter opening of second filter；
The filter opening density of second filter is more than the filter opening density of the first filter.
5. sectionally assembled Hydraulic Fracturing Stress Measurements filter according to claim 1, it is characterised in that also including
Three filters；
3rd filter is hollow cylinder；
One end of 3rd filter is connected with the one end of the first filter away from the hollow pipe column.
6. sectionally assembled Hydraulic Fracturing Stress Measurements filter according to claim 5, it is characterised in that the described 3rd
At least one hollow tubule is provided with the outer wall of filter；
The hollow tubule connects one to one with the filter opening on the 3rd filter.
7. sectionally assembled Hydraulic Fracturing Stress Measurements filter according to claim 6, it is characterised in that described hollow
Tubule is multiple rows of setting；
In hollow tubule described in same row, the axis angle of adjacent hollow tubule is 90 °.
8. sectionally assembled Hydraulic Fracturing Stress Measurements filter according to claim 7, it is characterised in that adjacent institute
State hollow tubule not at grade.
9. sectionally assembled Hydraulic Fracturing Stress Measurements filter according to claim 5, it is characterised in that the described 3rd
The one end of filter away from the first filter is provided with plug.
10. sectionally assembled Hydraulic Fracturing Stress Measurements filter according to claim 1, it is characterised in that the sky
Heart tubing string is handled for hard magnetization.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721111183.XU CN207169186U (en) | 2017-08-31 | 2017-08-31 | Sectionally assembled Hydraulic Fracturing Stress Measurements filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721111183.XU CN207169186U (en) | 2017-08-31 | 2017-08-31 | Sectionally assembled Hydraulic Fracturing Stress Measurements filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207169186U true CN207169186U (en) | 2018-04-03 |
Family
ID=61742437
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721111183.XU Withdrawn - After Issue CN207169186U (en) | 2017-08-31 | 2017-08-31 | Sectionally assembled Hydraulic Fracturing Stress Measurements filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207169186U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107469439A (en) * | 2017-08-31 | 2017-12-15 | 中国地质科学院地质力学研究所 | Sectionally assembled Hydraulic Fracturing Stress Measurements filter |
-
2017
- 2017-08-31 CN CN201721111183.XU patent/CN207169186U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107469439A (en) * | 2017-08-31 | 2017-12-15 | 中国地质科学院地质力学研究所 | Sectionally assembled Hydraulic Fracturing Stress Measurements filter |
| CN107469439B (en) * | 2017-08-31 | 2018-11-09 | 中国地质科学院地质力学研究所 | Sectionally assembled Hydraulic Fracturing Stress Measurements filter |
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