CN107060680A - Downhole packer system - Google Patents
Downhole packer system Download PDFInfo
- Publication number
- CN107060680A CN107060680A CN201710484369.8A CN201710484369A CN107060680A CN 107060680 A CN107060680 A CN 107060680A CN 201710484369 A CN201710484369 A CN 201710484369A CN 107060680 A CN107060680 A CN 107060680A
- Authority
- CN
- China
- Prior art keywords
- packer
- lower packet
- fracturing section
- high pressure
- middle fracturing
- 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.)
- Granted
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 invention provides a kind of downhole packer system for the hydrofracturing detecting earth stress in situ that drills, including upper packer body, middle fracturing section and lower packet body；The upper end of the upper packer body and the lower end of lower packet body are arranged respectively to sliding end, the middle fracturing section is fixedly connected with the upper packer body and lower packet body respectively, and high pressure water circuit is arranged at the inside of the upper packer body, middle fracturing section and lower packet body.The design of the present invention, add the voltage endurance capability of packer, high pressure water circuit is placed in the inside of upper packer body, middle fracturing section and lower packet body, add the external diameter of middle fracturing section, and middle fracturing section links into an integrated entity with upper lower packet, reduce above and below after packer inflation, water under high pressure acts on the area of upper packer lower end and lower packet upper end, the tension of middle fracturing section is acted on when reducing fracturing work, the compression strength of system is improved.
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 technology
At present, in the measurement of drilling waterpower hydrofracturing ground stress, with the increase of MTD, downhole packer need to be improved constantly
The overall voltage endurance capability of system, could meet the pressure demand of deep hole water pressure blasting hydrofracturing ground stress test.Answer existing hydrofracturing
In force test system, underground straddle packer is that end is fixed and by fastener for connection mostly, though the resistance to pressure of single packer
Degree, which is met, to be required, but when carrying out fracturing work, with the rise of middle fracturing section Fluid pressure, packer shearing strain quantity increases
Greatly, the pulling force increase of middle fracturing section is acted on, the pressure-resistant and tensile capacity of system decreases after being bridged by steel pipe, causes
Packer system can not meet 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.
The content of the invention
It is an object of the invention to provide a kind of downhole packer system for the hydrofracturing detecting earth stress in situ that drills
System, to solve packer compressive resistance present in prior art and the low technical problem of middle fracturing section tensile capacity.In order to
Above-mentioned purpose is realized, the invention provides following technical scheme；
It is used for the downhole packer system of hydrofracturing detecting earth stress in situ of drilling the invention provides a kind of, including it is upper
Packer body, middle fracturing section and lower packet body；
The upper end of the upper packer body and the lower end of lower packet body are arranged respectively to sliding end, the intermediate pressure
Split section to be fixedly connected with the upper packer body and lower packet body respectively, high pressure water circuit is arranged at the upper packer sheet
The inside of body, middle fracturing section and lower packet body.
The upper and lower ends of the packer system that the present invention is provided, upper packer body and lower packet body are arranged respectively to
Sliding end, middle fracturing section is fixedly connected with the upper packer body and lower packet body respectively, such design, middle
Fracturing section is connected with upper and lower packer body seamless seal, and high pressure water circuit is built in upper and lower packer body and middle fracturing section
Inside, upper lower packet body expansion after, form closed annulus in middle fracturing section, held to middle fracturing section
During water-filling pressure hydrofracturing ground stress experiment, while water under high pressure produces tension to stratum, pulling force (pressure is also produced to middle fracturing section
Power, which has, promotes the movement tendency of upper lower packet body respectively above and below), therefore by the way that high pressure water circuit is built in into internal system,
The external diameter of middle fracturing section is added, and middle fracturing section links into an integrated entity with upper lower packet, reduces lower packet sheet
After volume expansion, water under high pressure acts on the area of upper packer body lower end and lower packet body upper end, makees when reducing pressure break
For the tension of middle fracturing section, i.e., while packer compressive resistance is improved, the compression strength of system is also improved,
High pressure water circuit is integrated in the inside of upper lower packet body and middle fracturing section simultaneously, the protective effect to water route is served.
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 scheme, further, water under high pressure output channel is provided with the middle fracturing section.
In any of the above-described technical scheme, further, the upper packer body, middle fracturing section and lower packet sheet
Body is tightly connected successively.
In any of the above-described technical scheme, further, the middle fracturing section respectively with the upper packer body and
The junction of lower packet body is provided with annulus, to realize the connection of high pressure water circuit.
In any of the above-described technical scheme, further, the junction of high pressure water circuit is provided with high-pressure seal ring.
In any of the above-described technical scheme, further, in the slip of the upper packer body and lower packet body
End is slidingly sealed by high-pressure-resistant sealed circle respectively.
In any of the above-described technical scheme, further, the middle pressure break section be located at the upper packer body and under
Between packer body, and the external diameter of the middle fracturing section is respectively smaller than the upper packer body and lower packet body
External diameter.
In any of the above-described technical scheme, further, the bottom of the lower packet body is provided with seal plug.
In any of the above-described technical scheme, further, the bulge of the upper packer body and lower packet body
Position is made up of elastomeric material.
Using above-mentioned technical proposal, the present invention has the advantages that：
The upper and lower ends of the packer system that the present invention is provided, upper packer body and lower packet body are arranged respectively to
Sliding end, middle fracturing section is fixedly connected with the upper packer body and lower packet body respectively, such design, middle
Fracturing section is connected with upper and lower packer body seamless seal, and high pressure water circuit is built in upper and lower packer body and middle fracturing section
Inside, upper lower packet body expansion after, form closed annulus in middle fracturing section, held to middle fracturing section
During water-filling pressure hydrofracturing ground stress experiment, while water under high pressure produces tension to stratum, pulling force (pressure is also produced to middle fracturing section
Power, which has, promotes the movement tendency of upper lower packet body respectively above and below), therefore by the way that high pressure water circuit is built in into internal system,
The external diameter of middle fracturing section is added, and middle fracturing section links into an integrated entity with upper lower packet, reduces the effect of water under high pressure
Area, reduces the tension for acting on middle fracturing section, improves the compression strength of system, the range of pressure values of high pressure water circuit
For a-b, while packer voltage endurance capability is improved, the middle fracturing section i.e. tensile strength of fracturing section is also improved, by height
Protective effect is realized in the pressure integrated system of this packer again in water route.
The additional aspect and advantage of the present invention will become obvious in following description section, or pass through the practice of the present invention
Recognize.
Brief description of the drawings
Below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical scheme of the prior art
The accompanying drawing used required in embodiment or description of the prior art is briefly described, it should be apparent that, in describing below
Accompanying drawing is some embodiments of the present invention, for those of ordinary skill in the art, before creative work is not paid
Put, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is packer system dimensional structure diagram provided in an embodiment of the present invention；
Fig. 2 is the cross section structure diagram at a visual angle of packer system provided in an embodiment of the present invention；
Fig. 3 is the cross section structure diagram of the middle fracturing section shown in Fig. 2；
Fig. 4 is the cross section structure diagram of the sliding end shown in Fig. 2；
The dimensional structure diagram of the center-pole for the packer system that Fig. 5 provides for the present invention.
Reference：
10- upper packer bodies；11- sliding ends；12- center-poles；Fracturing section in the middle of 20-；30- lower packet bodies；40-
High pressure water circuit；50- high-pressure seal rings.
Embodiment
Technical scheme is clearly and completely described below in conjunction with accompanying drawing, it is clear that described implementation
Example is a part of embodiment of the invention, rather than whole embodiments.Based on the embodiment in the present invention, ordinary skill
The every other embodiment that personnel are obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
It should be noted that in the case where not conflicting, the feature in embodiments herein and embodiment can be mutually combined.
In the description of the invention, it is necessary to explanation, term " " center ", " on ", " under ", "left", "right", " vertical ",
The orientation or position relationship of the instruction such as " level ", " interior ", " outer " be based on orientation shown in the drawings or position relationship, merely to
Be easy to the description present invention and simplify description, rather than indicate or imply signified device or element must have specific orientation,
With specific azimuth configuration and operation, therefore it is not considered as limiting the invention.In addition, term " first ", " second ",
" the 3rd " is only used for describing purpose, and it is not intended that indicating or implying relative importance.
In the description of the invention, it is necessary to illustrate, unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected, or be integrally connected；Can
To be mechanical connection or electrical connection；Can be joined directly together, can also be indirectly connected to by intermediary, Ke Yishi
The connection of two element internals.For the ordinary skill in the art, with concrete condition above-mentioned term can be understood at this
Concrete meaning in invention.
With reference to specific embodiment the present invention will be further explained explanation.
Fig. 1 is packer system dimensional structure diagram provided in an embodiment of the present invention；Fig. 2 provides for the embodiment of the present invention
Packer system a visual angle cross section structure diagram；Fig. 3 is the sectional structure signal of the middle fracturing section shown in Fig. 2
Figure；
Fig. 4 is the cross section structure diagram of the sliding end shown in Fig. 2；The packer system that Fig. 5 provides for the present invention
The dimensional structure diagram of center-pole.
Embodiment one
As Figure 1-5, the packer system that the present embodiment is provided, including upper packer body 10, middle fracturing section 20
With lower packet body 30；
The upper end of the upper packer body 10 and the lower end of lower packet body 30 are arranged respectively to sliding end 11, described
Middle fracturing section 20 is fixedly connected with upper packer body 10 and lower packet body 30 respectively, high pressure water circuit set with it is described on
The inside of packer body 10, middle fracturing section 20 and lower packet body 30.
The packer system that embodiments of the invention are provided, up and down the two of upper packer body 10 and lower packet body 20
End is arranged respectively to sliding end 11, and middle fracturing section 20 is fixed with the upper packer body 10 and lower packet body 30 respectively
Connection, such design, middle fracturing section 20 is connected with upper and lower packer body seamless seal, high pressure water circuit 40 is built in,
The inside of lower packet body and middle fracturing section 20, after upper and lower this volume expansion of packer, is formd in middle fracturing section 20
Closed annulus, when performing the experiment of hydrofracturing crustal stress to middle fracturing section 20, water under high pressure produces tension to stratum
While, pulling force is also produced to middle fracturing section 20, and (pressure has upper motion of the lower packet body respectively above and below of promotion to become
Gesture), therefore by the way that high pressure water circuit 40 is built in into internal system, add the external diameter of middle fracturing section 20, and middle fracturing section
20 link into an integrated entity with upper lower packet body, reduce after upper and lower this volume expansion of packer, water under high pressure acts on upper packer
The lower end of body 10 and the area of the upper end of lower packet body 30, act on the tension of middle 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 packer voltage endurance capability is improved,
The middle fracturing section i.e. tensile strength of fracturing section is also improved, protection will be realized in the integrated system of this packer 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
Bar.
In this embodiment, the high pressure water circuit 40 of two, in the resistance to height of cross connection type sliding eye of downhole transmitted to the application
Press after packer system, offer high pressure aquaporin when respectively the expansion of packer system is with contraction and Hydraulic Fracturing Tests.
In an optional embodiment of above-described embodiment, it is preferred that be provided with height on the middle fracturing section 20
Press water output channel.
In this embodiment, middle fracturing section 20 is fracturing section, is expanded by injecting after water under high pressure, real in the borehole
Existing sealing space, water under high pressure enters from the water under high pressure output channel, up and down the confined space of two packer body formation, and then
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 body
10th, middle fracturing section 20 is mutually tightly connected successively with lower packet body 30.
Specifically, as Figure 1-5, the middle fracturing section 20 respectively with the upper packer body 10 and lower packet
The junction of body 30 is provided with annulus, to realize the connection of high pressure water circuit 40.Set in the junction of high pressure water circuit 40
Have high-pressure seal ring 50, the upper packer body 10 and lower packet body 30 sliding end 11 respectively by high pressure resistant close
Seal 50 is realized and is slidingly sealed.
In this specific embodiment, the center-pole 12 of high pressure water circuit 40 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 body 10 and lower packet body 30
11 are sealed by high-pressure seal ring 50 respectively, and the expansion position of the upper packer body 10 and lower packet body 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 Figure 1-2, it is preferred that the middle fracturing section
20 are located between the upper packer body 10 and lower packet body 30, and the external diameter difference of the middle fracturing section 20 is small
In the upper packer body 10 and the external diameter of lower packet body 30.
In this embodiment, interlude packer is that fracturing section between two packers, is sealed above and below at two up and down
Every after device sealing, water under high pressure is injected by high pressure water circuit 40, water under high pressure enters upper packer body from water under high pressure output channel
10 and lower packet body 30 formation ring-type hole wall space, high pressure water circuit 40 has been integrated into fracturing section in fracturing section
Portion, improves the external diameter of fracturing section, and then reduces the pulling force formed during water under high pressure 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 of the lower packet body 30 is set
It is equipped with seal plug.Such versatility for being designed to ensure that system accessories, seal plug is provided with system bottom, is realized
Upper lower packet is interchangeable, improves the practicality of system.
In summary, the upper and lower ends of the packer system that the present invention is provided, upper packer body and lower packet body
Sliding end is arranged respectively to, middle fracturing section is fixedly connected with the upper packer body and lower packet body respectively, so
Design, middle fracturing section is connected with upper and lower packer body seamless seal, and high pressure water circuit is built in upper and lower packer body
With the inside of middle fracturing section, after the expansion of upper lower packet body, closed annulus is formd in middle fracturing section, right
When middle fracturing section performs the experiment of hydrofracturing crustal stress, while water under high pressure produces tension to stratum, to middle fracturing section
Also pulling force (pressure, which has, promotes the movement tendency of upper lower packet body respectively above and below) is produced, therefore by by high pressure water circuit
Internal system is placed in, the external diameter of middle fracturing section is added, and middle fracturing section links into an integrated entity with upper lower packet, reduces
After upper lower packet body expansion, water under high pressure acts on the area of upper packer body lower end and lower packet body upper end, drop
The tension of middle fracturing section is acted on during low pressure break, i.e., while packer compressive resistance is improved, also improves and is
The tensile strength of system, while high pressure water circuit to be integrated in the inside of upper lower packet body and middle fracturing section, is served to water
The protective effect on road.
Finally it should be noted that：Various embodiments above is merely illustrative of the technical solution of the present invention, rather than its limitations；To the greatest extent
The present invention is described in detail with reference to foregoing embodiments for pipe, it will be understood by those within the art that：Its according to
The technical scheme described in foregoing embodiments can so be modified, or which part or all technical characteristic are entered
Row equivalent substitution；And these modifications or replacement, the essence of appropriate technical solution is departed from various embodiments of the present invention technology
The scope of scheme.Although in addition, it will be appreciated by those of skill in the art that some embodiments described herein include other implement
Included some features rather than further feature in example, but the combination of the feature of be the same as Example does not mean in the present invention
Within the scope of and form different embodiments.For example, in superincumbent claims, embodiment claimed
It is one of any mode to use in any combination.The information for being disclosed in the background section is merely intended to intensification pair
The understanding of the general background technology of the present invention, and it has been this to be not construed as recognizing or imply the information structure in any form
Prior art well known to art personnel.
Claims (10)
1. a kind of downhole packer system, for the hydrofracturing detecting earth stress in situ that drills, it is characterised in that including upper packing
Device body, middle fracturing section and lower packet body；
The upper end of the upper packer body and the lower end of lower packet body are arranged respectively to sliding end, the middle fracturing section
Be fixedly connected respectively with the upper packer body and lower packet body, high pressure water circuit be arranged at the upper packer body,
The inside of middle fracturing section and lower packet body.
2. downhole packer system according to claim 1, it is characterised in that
The high pressure water circuit is at least provided with two.
3. downhole packer system according to claim 1, it is characterised in that
Water under high pressure output channel is provided with the middle fracturing section.
4. downhole packer system according to claim 1, it is characterised in that
The upper packer body, middle fracturing section and lower packet body are tightly connected successively.
5. downhole packer system according to claim 4, it is characterised in that
Junction of the middle fracturing section respectively with the upper packer body and lower packet body is provided with annulus,
To realize the connection of high pressure water circuit.
6. downhole packer system according to claim 5, it is characterised in that
The junction of high pressure water circuit is provided with high-pressure seal ring.
7. downhole packer system according to claim 1, it is characterised in that
It is slidingly sealed respectively by high-pressure-resistant sealed circle in the sliding end of the upper packer body and lower packet body.
8. downhole packer system according to claim 1, it is characterised in that
The middle pressure break section is located between the upper packer body and lower packet body, and the middle fracturing section
External diameter is respectively smaller than the external diameter of the upper packer body and lower packet body.
9. downhole packer system according to claim 1, it is characterised in that
The bottom of the lower packet body is provided with seal plug.
10. downhole packer system according to claim 1, it is characterised in that
The expansion position of the upper packer body and lower packet body is made up of elastomeric 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 true CN107060680A (en) | 2017-08-18 |
| CN107060680B 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) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107829725A (en) * | 2017-12-06 | 2018-03-23 | 中国地质科学院地质力学研究所 | A kind of water causes pressure break stress measurement with inducing 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 |
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| 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 |
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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 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107829725A (en) * | 2017-12-06 | 2018-03-23 | 中国地质科学院地质力学研究所 | A kind of water causes pressure break stress measurement with inducing 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 |
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| Publication number | Publication date |
|---|---|
| CN107060680B (en) | 2019-10-01 |
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