CN107060680B - Downhole packer system - Google Patents
Downhole packer system Download PDFInfo
- Publication number
- CN107060680B CN107060680B CN201710484369.8A CN201710484369A CN107060680B CN 107060680 B CN107060680 B CN 107060680B CN 201710484369 A CN201710484369 A CN 201710484369A CN 107060680 B CN107060680 B CN 107060680B
- Authority
- CN
- China
- Prior art keywords
- ontology
- packer
- lower packet
- fracturing section
- high pressure
- 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.)
- Active
Links
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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/124—Units with longitudinally-spaced plugs for isolating the intermediate space
- E21B33/1243—Units with longitudinally-spaced plugs for isolating the intermediate space with inflatable sleeves
Abstract
The present invention provides a kind of downhole packer systems for the hydrofracturing detecting earth stress in situ that drills, including upper packer ontology, intermediate fracturing section and lower packet ontology；The upper end of the upper packer ontology and the lower end of lower packet ontology are arranged respectively to sliding end, the intermediate fracturing section is fixedly connected with the upper packer ontology and lower packet ontology respectively, and high pressure water circuit is set to the inside of the upper packer ontology, intermediate fracturing section and lower packet ontology.Design of the invention, increase the voltage endurance capability of packer, high pressure water circuit is placed in the inside of upper packer ontology, intermediate fracturing section and lower packet ontology, increase the outer diameter of intermediate fracturing section, and intermediate fracturing section links into an integrated entity with upper lower packet, after reducing packer inflation up and down, high pressure water acts on the area of upper packer lower end and lower packet upper end, the tensile stress that intermediate fracturing section is acted on when reducing fracturing work improves the compression strength of system.
Description
Technical field
The present invention relates to drilling hydraulic pressure hydrofracturing ground stress field of measuring technique, more particularly, to a kind of downhole packer system
System.
Background technique
Currently, with the increase of test depth, downhole packer need to be continuously improved in drilling waterpower hydrofracturing ground stress measurement
The whole voltage endurance capability of system is just able to satisfy the pressure demand of deep hole water pressure blasting hydrofracturing ground stress test.Answer to existing hydrofracturing
In force test system, underground straddle packer mostly be end fix and by steel pipe connect, though individually packer resistance to pressure
Degree is met the requirements, but when carrying out fracturing work, and with the raising of intermediate fracturing section Fluid pressure, packer shear deformation increases
Greatly, the pulling force for acting on intermediate fracturing section increases, and the pressure resistance of system and tensile capacity decrease after being bridged by steel pipe, causes
Packer system is unable to satisfy the strength demand in deep hole water pressure blasting hydrofracturing ground stress test process, with reducing deep hole water pressure blasting fracturing
The reliability and testing efficiency of stress test system.
Summary of the invention
The purpose of the present invention is to provide a kind of downhole packer systems for the hydrofracturing detecting earth stress in situ that drills
System, to solve the packer compressive resistance existing in the prior art technical problem low with intermediate fracturing section tensile capacity.In order to
Realize above-mentioned purpose, the present invention provides following technical schemes；
The present invention provides a kind of downhole packer system for the hydrofracturing detecting earth stress in situ that drills, including it is upper
Packer ontology, intermediate fracturing section and lower packet ontology；
The upper end of the upper packer ontology and the lower end of lower packet ontology are arranged respectively to sliding end, the intermediate pressure
It splits section to be fixedly connected with the upper packer ontology and lower packet ontology respectively, high pressure water circuit is set to the upper packer sheet
The inside of body, intermediate fracturing section and lower packet ontology.
The upper and lower ends of packer system provided by the invention, upper packer ontology and lower packet ontology are arranged respectively to
Sliding end, intermediate fracturing section are fixedly connected with the upper packer ontology and lower packet ontology respectively, such design, intermediate
Fracturing section is connect with upper and lower packer ontology seamless seal, and high pressure water circuit is built in upper and lower packer ontology and intermediate fracturing section
Inside, upper lower packet ontology expansion after, form closed annulus in intermediate fracturing section, held to intermediate fracturing section
When row hydrofracturing crustal stress is tested, while high pressure water generates tensile stress to stratum, pulling force (pressure is also generated to intermediate fracturing section
Power has the upper lower packet ontology of promotion respectively to upper and lower movement tendency), therefore by the way that high pressure water circuit is built in internal system,
The outer diameter of intermediate fracturing section is increased, and intermediate fracturing section links into an integrated entity with upper lower packet, reduces lower packet sheet
After body expansion, high pressure water acts on the area of upper packer ontology lower end and lower packet ontology upper end, work when reducing pressure break
For the tensile stress of intermediate fracturing section, i.e., while improving packer compressive resistance, the compression strength of system is also improved,
High pressure water circuit is integrated in the inside of upper lower packet ontology and intermediate fracturing section simultaneously, plays the protective effect to water route.
In the above-mentioned technical solutions, further, the high pressure water circuit is at least provided with two.
In any of the above-described technical solution, further, high pressure water output channel is provided on the intermediate fracturing section.
In any of the above-described technical solution, further, the upper packer ontology, intermediate fracturing section and lower packet sheet
Body is successively tightly connected.
In any of the above-described technical solution, further, the intermediate fracturing section respectively with the upper packer ontology and
The junction of lower packet ontology is provided with annulus, to realize the connection of high pressure water circuit.
In any of the above-described technical solution, further, the junction of high pressure water circuit is provided with high-pressure seal ring.
In any of the above-described technical solution, further, in the sliding of the upper packer ontology and lower packet ontology
End is slidingly sealed by high-pressure-resistant sealed circle respectively.
In any of the above-described technical solution, further, the intermediate pressure break section be located at the upper packer ontology and under
Between packer ontology, and the outer diameter of the intermediate fracturing section is respectively smaller than the upper packer ontology and lower packet ontology
Outer diameter.
In any of the above-described technical solution, further, the bottom end of the lower packet ontology is provided with seal plug.
In any of the above-described technical solution, further, the bulge of the upper packer ontology and lower packet ontology
Position is made of rubber material.
By adopting the above technical scheme, the invention has the following beneficial effects:
The upper and lower ends of packer system provided by the invention, upper packer ontology and lower packet ontology are arranged respectively to
Sliding end, intermediate fracturing section are fixedly connected with the upper packer ontology and lower packet ontology respectively, such design, intermediate
Fracturing section is connect with upper and lower packer ontology seamless seal, and high pressure water circuit is built in upper and lower packer ontology and intermediate fracturing section
Inside, upper lower packet ontology expansion after, form closed annulus in intermediate fracturing section, held to intermediate fracturing section
When row hydrofracturing crustal stress is tested, while high pressure water generates tensile stress to stratum, pulling force (pressure is also generated to intermediate fracturing section
Power has the upper lower packet ontology of promotion respectively to upper and lower movement tendency), therefore by the way that high pressure water circuit is built in internal system,
The outer diameter of intermediate fracturing section is increased, and intermediate fracturing section links into an integrated entity with upper lower packet, reduces the effect of high pressure water
Area reduces the tensile stress for acting on intermediate fracturing section, improves the compression strength of system, the range of pressure values of high pressure water circuit
The intermediate fracturing section i.e. tensile strength of fracturing section is also improved while improving packer voltage endurance capability for a-b, it will be high
Protective effect is realized in integrated this packer system again in pressure water route.
Additional aspect and advantage of the invention will become obviously in following description section, or practice through the invention
Recognize.
Detailed description of the invention
It below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art be briefly described, it should be apparent that, it is described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, is also possible to obtain other drawings based on these drawings.
Fig. 1 is packer system schematic perspective view provided in an embodiment of the present invention；
Fig. 2 is the schematic cross-sectional view at a visual angle of packer system provided in an embodiment of the present invention；
Fig. 3 is the schematic cross-sectional view of intermediate fracturing section shown in Fig. 2；
Fig. 4 is the schematic cross-sectional view of sliding end shown in Fig. 2；
Fig. 5 is the schematic perspective view of the center-pole of packer system provided by the invention.
Appended drawing reference:
10- upper packer ontology；11- sliding end；12- center-pole；Fracturing section among 20-；30- lower packet ontology；40-
High pressure water circuit；50- high-pressure seal ring.
Specific embodiment
Technical solution of the present invention is clearly and completely described below in conjunction with attached drawing, it is clear that described implementation
Example is a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill
Personnel's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
It should be noted that in the absence of conflict, the feature in embodiments herein and embodiment can be combined with each other.
In the description of the present invention, it should be noted that term " center ", "upper", "lower", "left", "right", "vertical",
The orientation or positional relationship of the instructions such as "horizontal", "inner", "outside" be based on the orientation or positional relationship shown in the drawings, merely to
Convenient for description the present invention and simplify description, rather than the device or element of indication or suggestion meaning must have a particular orientation,
It is constructed and operated in a specific orientation, therefore is not considered as limiting the invention.In addition, term " first ", " second ",
" third " is used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition
Concrete meaning in invention.
Below with reference to specific embodiment the present invention will be further explained explanation.
Fig. 1 is packer system schematic perspective view provided in an embodiment of the present invention；Fig. 2 provides for the embodiment of the present invention
Packer system a visual angle schematic cross-sectional view；Fig. 3 is that the sectional structure of intermediate fracturing section shown in Fig. 2 is illustrated
Figure；
Fig. 4 is the schematic cross-sectional view of sliding end shown in Fig. 2；Fig. 5 is packer system provided by the invention
The schematic perspective view of center-pole.
Embodiment one
As shown in Figs. 1-5, packer system provided in this embodiment, including upper packer ontology 10, intermediate fracturing section 20
With lower packet ontology 30；
The upper end of the upper packer ontology 10 and the lower end of lower packet ontology 30 are arranged respectively to sliding end 11, described
Intermediate fracturing section 20 is fixedly connected with upper packer ontology 10 and lower packet ontology 30 respectively, high pressure water circuit setting with it is described on
The inside of packer ontology 10, intermediate fracturing section 20 and lower packet ontology 30.
The packer system that the embodiment of the present invention provides, up and down the two of upper packer ontology 10 and lower packet ontology 20
End is arranged respectively to sliding end 11, and intermediate fracturing section 20 is fixed with the upper packer ontology 10 and lower packet ontology 30 respectively
Connection, such design, intermediate fracturing section 20 connect with upper and lower packer ontology seamless seal, high pressure water circuit 40 is built in,
The inside of lower packet ontology and intermediate fracturing section 20 forms after the expansion of upper and lower packer ontology in intermediate fracturing section 20
Closed annulus, when executing the test of hydrofracturing crustal stress to intermediate fracturing section 20, high pressure water generates tensile stress to stratum
While, pulling force is also generated to intermediate fracturing section 20, and (pressure has the upper lower packet ontology of promotion to become respectively to upper and lower movement
Gesture), therefore by the way that high pressure water circuit 40 is built in internal system, increase the outer diameter of intermediate fracturing section 20, and intermediate fracturing section
20 link into an integrated entity with upper lower packet ontology, and after reducing upper and lower packer ontology expansion, high pressure water acts on upper packer
The area of 30 upper end of 10 lower end of ontology and lower packet ontology, acts on the tensile stress of intermediate fracturing section 20 when reducing pressure break,
The compression strength of system is improved, the range of pressure values of high pressure water circuit is a-b, while improving packer voltage endurance capability,
The intermediate fracturing section i.e. tensile strength of fracturing section is also improved, protection will be realized in integrated this packer system again of high pressure water circuit
Effect.
It should be noted that in the present embodiment, the range of pressure values of high pressure water circuit is 0-50MPa.
In an optional embodiment of above-described embodiment, it is preferred that the high pressure water circuit 40 is at least provided with two
Item.
In this embodiment, two high pressure water circuits 40, in the resistance to height of cross connection type sliding eye of downhole transmitted to the application
After pressing packer system, the respectively expansion of packer system and offer high pressure aquaporin when contraction and Hydraulic Fracturing Tests.
In an optional embodiment of above-described embodiment, it is preferred that be provided with height on the intermediate fracturing section 20
Press water output channel.
In this embodiment, intermediate fracturing section 20 is fracturing section, real in the borehole by expanding after injection high pressure water
Existing sealing space, high pressure water enter from the high pressure water output channel, the confined space that upper and lower two packer ontologies are formed, in turn
Confined space between two packers carries out hydrofracturing detecting earth stress.
In an optional embodiment of above-described embodiment, as shown in Figure 1, it is preferred that the upper packer ontology
10, intermediate fracturing section 20 is successively mutually tightly connected with lower packet ontology 30.
Specifically, as shown in Figs. 1-5, the intermediate fracturing section 20 respectively with the upper packer ontology 10 and lower packet
The junction of ontology 30 is provided with annulus, to realize the connection of high pressure water circuit 40.It is arranged in the junction of high pressure water circuit 40
There is high-pressure seal ring 50, in the sliding end 11 of the upper packer ontology 10 and lower packet ontology 30 respectively by high pressure resistant close
The realization of seal 50 is slidingly sealed.
In this specific embodiment, 40 center-pole 12 of high pressure water circuit is sealed in packer system by way of being spirally connected
It is interior, and be slidingly sealed with high-pressure seal ring 50 with realizing, meanwhile, the sliding end of upper packer ontology 10 and lower packet ontology 30
11 are sealed by high-pressure seal ring 50 respectively, and the expansion position of the upper packer ontology 10 and lower packet ontology 30 is rubber
Material is made, and provides adjustment space in packer inflation and contraction, improves the voltage endurance capability of packer.
In an optional embodiment of above-described embodiment, as shown in Figs. 1-2, it is preferred that the intermediate fracturing section
20 between the upper packer ontology 10 and lower packet ontology 30, and the outer diameter difference of the intermediate fracturing section 20 is small
In the outer diameter of the upper packer ontology 10 and lower packet ontology 30.
In this embodiment, interlude packer, that is, fracturing section seals between upper and lower two packers at upper and lower two
After device sealing, high pressure water is injected by high pressure water circuit 40, high pressure water enters upper packer ontology from high pressure water output channel
10 and lower packet ontology 30 formed cyclic annular hole wall space, high pressure water circuit 40 has been integrated into fracturing section in fracturing section
Portion improves the outer diameter of fracturing section, thereby reduces the pulling force formed when high pressure water injection in fracturing section, improves the anti-of system
Drawing ability.
In an optional embodiment of above-described embodiment, it is preferred that the bottom end of the lower packet ontology 30 is set
It is equipped with seal plug.Such versatility for being designed to ensure that system accessories is provided with seal plug in system lower end, realizes
Upper lower packet is interchangeable, improves the practicability of system.
In conclusion packer system provided by the invention, the upper and lower ends of upper packer ontology and lower packet ontology
It is arranged respectively to sliding end, intermediate fracturing section is fixedly connected with the upper packer ontology and lower packet ontology respectively, in this way
Design, intermediate fracturing section connect with upper and lower packer ontology seamless seal, and high pressure water circuit is built in upper and lower packer ontology
Closed annulus is formd in intermediate fracturing section, right after the expansion of upper lower packet ontology with the inside of intermediate fracturing section
When intermediate fracturing section executes the test of hydrofracturing crustal stress, while high pressure water generates tensile stress to stratum, to intermediate fracturing section
Also it generates pulling force (pressure has the upper lower packet ontology of promotion respectively to upper and lower movement tendency), therefore by will be in high pressure water circuit
It is placed in internal system, increases the outer diameter of intermediate fracturing section, and intermediate fracturing section links into an integrated entity with upper lower packet, reduces
After upper lower packet ontology expansion, high pressure water acts on the area of upper packer ontology lower end and lower packet ontology upper end, drop
The tensile stress that intermediate fracturing section is acted on when low pressure break also improves that is, while improving packer compressive resistance and is
The tensile strength of system, while high pressure water circuit being integrated in the inside of upper lower packet ontology and intermediate fracturing section, it plays to water
The protective effect on road.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to
So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into
Row equivalent replacement；And these are modified or replaceed, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.In addition, it will be appreciated by those of skill in the art that although some embodiments described herein include other implementations
Certain features rather than other feature included by example, but the combination of the feature of different embodiments means in the present invention
Within the scope of and form different embodiments.For example, in claims above, embodiment claimed
It is one of any can in any combination mode come using.The information disclosed in the background technology section is intended only to deepen pair
The understanding of general background technology of the invention, and be not construed as recognizing or implying in any form that information composition has been this
The prior art well known to the technical staff of field.
Claims (4)
1. a kind of downhole packer system, for the hydrofracturing detecting earth stress in situ that drills, which is characterized in that including upper packing
Device ontology, intermediate fracturing section and lower packet ontology；
The upper end of the upper packer ontology and the lower end of lower packet ontology are arranged respectively to sliding end, the intermediate fracturing section
Be fixedly connected respectively with the upper packer ontology and lower packet ontology, high pressure water circuit be set to the upper packer ontology,
The inside of intermediate fracturing section and lower packet ontology；
High pressure water output channel is provided on the intermediate fracturing section；
The upper packer ontology, intermediate fracturing section and lower packet ontology are successively tightly connected；
Junction of the intermediate fracturing section respectively with the upper packer ontology and lower packet ontology is provided with annulus,
To realize the connection of high pressure water circuit；
The junction of high pressure water circuit is provided with high-pressure seal ring；
The high pressure water circuit is at least provided with two；
High pressure water circuit center-pole is sealed in the downhole packer system by way of being spirally connected, and in the upper packer
The sliding end of ontology and lower packet ontology passes through high-pressure-resistant sealed circle respectively and is slidingly sealed；
The intermediate pressure break section is between the upper packer ontology and lower packet ontology.
2. downhole packer system according to claim 1, which is characterized in that
The outer diameter of the intermediate fracturing section is respectively smaller than the outer diameter of the upper packer ontology and lower packet ontology.
3. downhole packer system according to claim 1, which is characterized in that
The bottom end of the lower packet ontology is provided with seal plug.
4. downhole packer system according to claim 1, which is characterized in that
The expansion position of the upper packer ontology and lower packet ontology is made of rubber material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710484369.8A CN107060680B (en) | 2017-06-23 | 2017-06-23 | Downhole packer system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710484369.8A CN107060680B (en) | 2017-06-23 | 2017-06-23 | Downhole packer system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107060680A CN107060680A (en) | 2017-08-18 |
| CN107060680B true CN107060680B (en) | 2019-10-01 |
Family
ID=59613205
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710484369.8A Active CN107060680B (en) | 2017-06-23 | 2017-06-23 | Downhole packer system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107060680B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107829725B (en) * | 2017-12-06 | 2018-10-02 | 中国地质科学院地质力学研究所 | A kind of water causes pressure break stress measurement and induces crack dynamic imaging integrating device |
| CN111650050A (en) * | 2020-06-12 | 2020-09-11 | 鞍钢集团矿业有限公司 | Hydraulic fracturing test system and method for improving collapse characteristic of hard rock ore |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5974874A (en) * | 1993-10-20 | 1999-11-02 | Gas Research Institute | Method for testing gas wells in low pressured gas formations |
| CN2651433Y (en) * | 2003-09-10 | 2004-10-27 | 长春市恒大石油机械厂 | Small diameter inflatable packer for water injection well |
| CN104453865A (en) * | 2013-09-17 | 2015-03-25 | 李忠久 | Single-loop hydrofracturing in-situ stress measuring system |
| JP2016108804A (en) * | 2014-12-05 | 2016-06-20 | 応用地質株式会社 | Hydraulic fracture testing device |
| CN205714149U (en) * | 2016-06-12 | 2016-11-23 | 中国地震局地壳应力研究所 | Hydraulic fracturing stress measurement device |
-
2017
- 2017-06-23 CN CN201710484369.8A patent/CN107060680B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5974874A (en) * | 1993-10-20 | 1999-11-02 | Gas Research Institute | Method for testing gas wells in low pressured gas formations |
| CN2651433Y (en) * | 2003-09-10 | 2004-10-27 | 长春市恒大石油机械厂 | Small diameter inflatable packer for water injection well |
| CN104453865A (en) * | 2013-09-17 | 2015-03-25 | 李忠久 | Single-loop hydrofracturing in-situ stress measuring system |
| JP2016108804A (en) * | 2014-12-05 | 2016-06-20 | 応用地質株式会社 | Hydraulic fracture testing device |
| CN205714149U (en) * | 2016-06-12 | 2016-11-23 | 中国地震局地壳应力研究所 | Hydraulic fracturing stress measurement device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107060680A (en) | 2017-08-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103868661B (en) | Open hole packer assay device and using method thereof | |
| CN103930645B (en) | Annular barrier system and the method for the pressure integrity using this system test well | |
| CN202596684U (en) | Testing process pipe column for casing pipe well completion horizontal well multistage subsection production and water detection | |
| CN102747967A (en) | Multi-stage segmented release water exploration pipe column and method for casing well completion multi-stage fractured horizontal well | |
| CN104729969B (en) | Surrouding rock stress level of disruption test device | |
| CN103603651B (en) | Devices and methods for testing the stability of coal seam gas extraction drilled holes | |
| CN105804735A (en) | Three-plunger type hydraulic fracturing ground stress measurement system | |
| CN107060680B (en) | Downhole packer system | |
| CN107923230A (en) | Seal the downhole completion system of cap rock | |
| AU2019201471B2 (en) | High-pressure self-locking packer and setting method thereof | |
| CN102953365B (en) | Multilayer blade-typed multipoint displacement metre anchor head used for soft soil layer | |
| CN205858333U (en) | A kind of three plug hydraulic fracturing detecting earth stress systems | |
| CN203321480U (en) | Cased hole completion multi-stage fracturing horizontal well selective mining pipe column | |
| US9534478B2 (en) | Perforating packer casing evaluation methods | |
| CN107725029A (en) | A kind of underground coal mine long drilled holes gas flow test device and method | |
| CN110017132A (en) | A kind of hydraulic fracturing packer and fracturing section pressure monitoring device | |
| CN111042786A (en) | Hydraulic fracturing measuring device suitable for three-dimensional measuring device | |
| CN104563953A (en) | Double-layer steel pipe expansion type pipe external casing packer | |
| CN103776572B (en) | Detecting earth stress device | |
| CN110847889A (en) | Hydraulic fracturing test system and test method | |
| CN102619495A (en) | Multi-section delaminated fracturing tool string for vertical shaft immovable pipe column | |
| CN203584405U (en) | Device for testing stability of drilled hole for coal bed gas extraction | |
| US20140166275A1 (en) | System and method for determining mechanical properties of a formation | |
| CN202273639U (en) | High pressure resistant hydraulic packer | |
| CN202645523U (en) | Shallow measuring sectional water-injecting pipe column for horizontal well |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |