CN108489341A - A kind of target of simulation reservoir confining pressure effect - Google Patents
A kind of target of simulation reservoir confining pressure effect Download PDFInfo
- Publication number
- CN108489341A CN108489341A CN201810499926.8A CN201810499926A CN108489341A CN 108489341 A CN108489341 A CN 108489341A CN 201810499926 A CN201810499926 A CN 201810499926A CN 108489341 A CN108489341 A CN 108489341A
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- Prior art keywords
- target
- sheath
- target core
- core
- sandstone
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- 238000004088 simulation Methods 0.000 title claims abstract description 13
- 230000000694 effects Effects 0.000 title claims abstract description 12
- 238000007596 consolidation process Methods 0.000 claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000004568 cement Substances 0.000 claims abstract description 6
- 239000011083 cement mortar Substances 0.000 claims abstract description 6
- 239000006004 Quartz sand Substances 0.000 claims abstract description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000003129 oil well Substances 0.000 claims abstract description 5
- 230000010412 perfusion Effects 0.000 claims abstract description 4
- 238000003860 storage Methods 0.000 claims description 11
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 239000010433 feldspar Substances 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 238000005520 cutting process Methods 0.000 claims description 2
- 239000011435 rock Substances 0.000 claims description 2
- 230000035515 penetration Effects 0.000 abstract description 5
- 238000005474 detonation Methods 0.000 abstract description 4
- 238000011156 evaluation Methods 0.000 abstract description 4
- 238000002224 dissection Methods 0.000 abstract description 3
- 239000002184 metal Substances 0.000 abstract description 3
- 238000009826 distribution Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 abstract description 2
- 238000004062 sedimentation Methods 0.000 abstract description 2
- 230000002427 irreversible effect Effects 0.000 abstract 1
- 230000029052 metamorphosis Effects 0.000 abstract 1
- 230000001681 protective effect Effects 0.000 abstract 1
- 238000004513 sizing Methods 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 208000037656 Respiratory Sounds Diseases 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 238000012356 Product development Methods 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000005429 filling process Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 230000004941 influx Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 238000010606 normalization Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 238000012372 quality testing Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F41—WEAPONS
- F41J—TARGETS; TARGET RANGES; BULLET CATCHERS
- F41J1/00—Targets; Target stands; Target holders
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a kind of simulation reservoir confining pressures to act on target, including sandstone target core, consolidation object and sheath.Sandstone target core is that crude sedimentation sandstone (or reservoir core) is made；Consolidation object is mixed into cement mortar by quartz sand, A grades of oil-well cements and clear water with certain proportion, will be consolidated in cement mortar perfusion, the gap being filled between sandstone target core and sheath；Sheath is metal shell, as after sizing, the detonation of protective device perforating bullet constraint of the reservoir confining pressure to sandstone target core is simulated by consolidating object and sheath, perforation situation of the true reflection jet stream in reservoir, while preventing jet stream irreversible breaking caused by target body in sandstone target core perforation procedure.Dissection to target, it can clearly see observation perforation tunnel metamorphosis, penetration depth and duct crack distribution situation, it is capable of the performance of objective reality evaluation perforating bullet, more can really reflects perforating effect of the perforating bullet in oil and gas reservoir, achieve the purpose that meet frscturing.
Description
Technical field
The invention belongs to the performance test fields of oil and gas industry perforation explosive, and in particular to a kind of simulation
The target of reservoir confining pressure effect.
Background technology
Perforating bullet forms high-velocity wire jet stream by detonation and penetrates the oil-containing of casing, cement sheath and certain depth, gas reservoir,
Oil or gas in stratum is by carrying out oil and gas gathering in these perforation tunnel sleeve pipes (pit shaft).Therefore the pierceability of perforating bullet
Energy, mainly duct crack distribution situation after penetration depth, piercing aperture, jet hole channel morphology and perforation, affect
The yield of oil gas, therefore be ten to the evaluation of the performances such as shape of plasma jet after the punching quality of perforating bullet, perforating bullet detonation
Divide key.Performance Evaluation to perforating bullet and detection can only be penetrated because of the limitation of conditions down-hole in surface condition Imitating underground
Hole state using a kind of target of manual manufacture, then carries out perforating test, by test target penetration depth, the performances such as barrel hole size,
To differentiate the quality good or not of perforating bullet and judge whether that adapting to corresponding stratum perforation wears deep requirement.The target that the country uses at present
It is to recommend the requirement in " API19B " standard according to American Petroleum Institute (API) and make for concrete target, exists and be fabricated to
This height, fabrication cycle are long, duct is easily destroyed, the variation of target body axial compression strength greatly the shortcomings of, and in perforating bullet design and
It is unable to normalization use during product quality inspection, and differs greatly with actual reservoir condition, it cannot objective guide product
Design and completion practice design.
Invention content
Present invention solves the technical problem that being：In order to solve make target it is of high cost, compression strength change greatly, jet hole
Road form destructible is difficult the problems such as reaction perforating bullet wears deep performance.
The technical scheme is that：A kind of target of simulation reservoir confining pressure effect, the target includes aqua storage tank
1, sheath 4, target core 2 and consolidation object 3, the cavity column generally closed at both ends of sheath 4, wherein one side edge are along axis week
To equipped with a circle protrusion, aqua storage tank 1 is formed；Target core 2 is located in cavity, and 2 axis of target core overlaps with 4 axis of sheath；Target
Object 3 is consolidated between 4 inner wall of 2 outer wall of core and sheath by filling to reinforce target core 2.
The present invention further technical solution be：Between height of water level ranging from 30mm~100mm in the aqua storage tank.
The present invention further technical solution be：The target core 2 belong to purple mudstone it is thin-superfine particle feldspar quartzy sandstone, it is whole
Body rock becomes the cylindrical target that height H1 is between 600mm~1000mm, diameter phi 1 is between 110mm~180mm after cutting
Core.
The present invention further technical solution be：The consolidation object 3 presses quality using A grades of oil-well cement/quartz sand/clear water
Than 1:2:1 ratio is mixed into cement mortar perfusion, consolidates in the gap that is filled between target core 2 and sheath 4 and is made, height
H1 is between 600mm~1000mm, and diameter phi 2 is between 300mm~450mm.
The present invention further technical solution be：The sheath 4 is formed so that steel plate is coiling welded, height H 800mm~
Between 1200mm, wall thickness δ is between 3mm~5mm, diameter phi 3=φ 2+2 δ.
Invention effect
The present invention is suitable for perforating bullet manufacturer in product as petroleum perforation charge performance evaluation, quality testing target
To various technical parameters, preferred verification, the examination of design scheme during quality control detection target and new product development are developed in production
It tests and uses target, could be applicable to user to product quality examination, detection target.The utility model have it is at low cost, cost is mixed
The part of soil target cuts open the features such as target is easy, and can axially split exposed duct to detect observation perforation using simple
Duct situation can save several times testing expenses compared with mixed mud target.
Description of the drawings
Fig. 1 is the structural schematic diagram of target.
Fig. 2 is the sectional view that target is cut along cross section.
Reference sign：1-aqua storage tank, 2-target cores, 3-consolidation objects, 4-sheaths.
Specific implementation mode
Referring to Fig. 1-Fig. 2, a kind of simulation reservoir confining pressure effect target, sheath 4 is metal shell, generally cylindrical,
4 center of sheath be placed with purple mudstone it is thin-the target core 2 that is fabricated to of superfine particle feldspar quartzy sandstone, target core 2 by setting sheath 4 with
Consolidation object 3 between target core 2 is connected.
Sandstone target core 2 purple mudstone it is thin-superfine particle feldspar quartzy sandstone made of cylindrical target core, height H1 is in 600mm
Between~1000mm, diameter phi 1 is between 110mm~180mm.
Object 3 is consolidated with A grades of oil-well cements, quartz sand, clear water according to mass ratio 1:2：Water made of 1 ratio mixed preparing
Cement mortar is perfused, is consolidated in the gap that is filled between target core 2 and sheath 4, and height H1 is in 600mm~1000mm, directly
Diameter φ 2 is in 300mm~450mm.
Sheath 4 is formed so that steel plate is coiling welded, and height H is between 800mm~1200mm, and wall thickness δ is between 3mm~5mm, directly
Diameter φ 3=φ 2+2 δ, wherein δ is expressed as the wall thickness of sheath.
Sheath 4 is metal shell, generally cylindrical, the sandstone target core 2 being fabricated to equipped with crude sedimentation sandstone in sheath,
Sandstone target core 2 is connected by the consolidation object 3 being arranged between sheath 4 and sandstone target core 2, and clear water is layered on target body aqua storage tank 1
Inside it is mainly used for conserving target body.
It when manufacture, is sealed first with plastic foil in the bottom end of sheath 4, prevents the slurries in filling concrete mortar from flowing out,
It is secondary that target core 2 is placed on to 4 center of sheath is fixed, the consolidation object 3 configured is then fed into target core 2 and sheath 4
Between, filling process will be stirred, and reduce the bubble in cement mortar as far as possible, be flushed with target core 2 until consolidating object 3, will
It consolidates object 3 to smooth out, being put into clear water in the aqua storage tank 1 after placement waiting condensation above target body is conserved, and object 3 to be consolidated is thoroughly
It can be used after solidification.
The invention mainly comprises：Aqua storage tank 1, target core 2, consolidation object 3 and sheath 4.Target core 2 is cylindric, generally selects day
So deposition sandstone is made, and lithology is based on packsand, and between 110mm~180mm, height H1's 2 diameter phi 1 of target core exists
Between 600mm~1000mm, target core outer surface is without apparent crackle.Consolidation object 3 is with A grades of oil-well cement/quartz sand/clear water by matter
Measure ratio 1:2：1 ratio mixed preparing forms, and consolidation object 3 is filled into after stirring evenly between target core 2 and sheath 4, is perfused
Journey will stir, and reduce bubble as far as possible, and packed height H1 is determined in 600mm~1000mm, influx height by target core height, straight
Diameter φ 2 is in 200mm~450mm.Sheath 4 is formed by steel plate is coiling welded, height H in 600mm~1000mm, diameter phi 3=φ 1+2 δ,
4 wall thickness δ of sheath is between 3mm~5mm.It is put into clear water in aqua storage tank 1 after the consolidation perfusion of object 3 finishes Surface hardened layer, is formed
Clear water conservation layer can be used until consolidation object 3 is fully hardened.
Using target produced by the present invention, target major parameter is that target core diameter is 110mm, is highly 800mm, shield
Sleeve wall thickness 3mm, a diameter of 400mm, height 1000mm, match 114 type perforating bullets, and progress ground simulation fills 114 type perforating guns and wears 7 "
Test on bushing, after tested, average penetration depth reach 400mm or more.Annular concrete target is used compared to API standard, after perforation
It needs Large Crusher tool to carry out target body dissection, and is particularly easy to the phenomenon that perforation tunnel is destroyed occur, and the target
It is easy to operate in target body when dissected, sheath is cut with along solder joint, is left consolidation object and target core after taking down sheath, consolidates object not only
Protection target core can form the constraint to jet stream radial direction detonation pressure without being crushed and dispersing completely, altitude simulation stratum
Confining pressure acts on；Due to being acted on by blast wave, consolidation object has cracked, and is splitted along crackle and exposes target core, edge after consolidating object
The dissection of target core crackle, can see clear, complete jet stream duct.The target can not only reach effective survey after perforation
Measure the purpose of the penetration depth of target body, the crushed zone and compaction band that can be more clearly observable around perforation tunnel, for follow-up volume increase
Etc. techniques provide reference frame.
Claims (5)
1. a kind of target of simulation reservoir confining pressure effect, which is characterized in that the target includes aqua storage tank (1), sheath
(4), target core (2) and consolidation object (3), sheath (4) cavity column generally closed at both ends, wherein one side edge is along axis
It is circumferentially with circle protrusion, forms aqua storage tank (1)；Target core (2) is located in cavity, and target core (2) axis and sheath (4) axis phase
Mutually overlap；Object (3) is consolidated between target core (2) outer wall and sheath (4) inner wall by filling to reinforce target core (2).
2. a kind of target of simulation reservoir confining pressure effect as described in claim 1, which is characterized in that in the aqua storage tank
Between height of water level ranging from 30mm~100mm.
3. a kind of target of simulation reservoir confining pressure effect as described in claim 1, which is characterized in that the target core (2) belongs to
In purple mudstone it is thin-superfine particle feldspar quartzy sandstone, whole rock become after cutting height H1 between 600mm~1000mm, it is straight
Cylindrical target cores of the diameter φ 1 between 110mm~180mm.
4. a kind of target of simulation reservoir confining pressure effect as described in claim 1, which is characterized in that the consolidation object (3)
Using A grades of oil-well cement/quartz sand/clear water in mass ratio 1:2:1 ratio is mixed into cement mortar perfusion, is filled in target core
(2) consolidate and be made in the gap between sheath (4), height H1 between 600mm~1000mm, diameter phi 2 300mm~
Between 450mm.
5. a kind of target of simulation reservoir confining pressure effect as described in claim 1, which is characterized in that the sheath (4) with
Steel plate is coiling welded to be formed, and height H is between 800mm~1200mm, and wall thickness δ is between 3mm~5mm, diameter phi 3=φ 2+2 δ.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810499926.8A CN108489341A (en) | 2018-05-23 | 2018-05-23 | A kind of target of simulation reservoir confining pressure effect |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810499926.8A CN108489341A (en) | 2018-05-23 | 2018-05-23 | A kind of target of simulation reservoir confining pressure effect |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108489341A true CN108489341A (en) | 2018-09-04 |
Family
ID=63351124
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810499926.8A Pending CN108489341A (en) | 2018-05-23 | 2018-05-23 | A kind of target of simulation reservoir confining pressure effect |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108489341A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112211600A (en) * | 2020-09-15 | 2021-01-12 | 中国石油天然气股份有限公司 | Radial confining pressure loading anti-impact structure of perforation target |
| CN114060006A (en) * | 2021-11-26 | 2022-02-18 | 西南石油大学 | Device for testing strength and sealing performance of cement sheath after perforation and using method thereof |
| CN115159913A (en) * | 2022-07-29 | 2022-10-11 | 物华能源科技有限公司 | High-strength columnar concrete formula for static penetration of perforating bullet and target |
| CN116482336A (en) * | 2023-06-26 | 2023-07-25 | 中海油田服务股份有限公司 | Multi-dimensional perforation damage evaluation method, device, computing equipment and storage medium |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2204855Y (en) * | 1994-10-17 | 1995-08-09 | 李永清 | Sandstone target for perforating bullet inspection |
| US6238595B1 (en) * | 1998-02-17 | 2001-05-29 | Schlumberger Technology Corp. | Target for testing perforating systems |
| CN2913602Y (en) * | 2006-07-12 | 2007-06-20 | 中国石化集团胜利石油管理局测井公司 | Experimental perforating butt and experimental perforating tool for simulating down-hole perforating conditions |
| CN101514623A (en) * | 2009-04-07 | 2009-08-26 | 中国石油集团川庆钻探工程有限公司 | Production and installation method of perforation simulation target device for laboratory |
| US20090241700A1 (en) * | 2008-03-31 | 2009-10-01 | Halliburton Energy Services, Inc. | Apparatus for Constructing a Target Core From Unconsolidated Sand and Method for Use of Same |
| CN208282685U (en) * | 2018-05-23 | 2018-12-25 | 中海石油（中国）有限公司天津分公司 | A kind of target of simulation reservoir confining pressure effect |
-
2018
- 2018-05-23 CN CN201810499926.8A patent/CN108489341A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2204855Y (en) * | 1994-10-17 | 1995-08-09 | 李永清 | Sandstone target for perforating bullet inspection |
| US6238595B1 (en) * | 1998-02-17 | 2001-05-29 | Schlumberger Technology Corp. | Target for testing perforating systems |
| CN2913602Y (en) * | 2006-07-12 | 2007-06-20 | 中国石化集团胜利石油管理局测井公司 | Experimental perforating butt and experimental perforating tool for simulating down-hole perforating conditions |
| US20090241700A1 (en) * | 2008-03-31 | 2009-10-01 | Halliburton Energy Services, Inc. | Apparatus for Constructing a Target Core From Unconsolidated Sand and Method for Use of Same |
| CN101514623A (en) * | 2009-04-07 | 2009-08-26 | 中国石油集团川庆钻探工程有限公司 | Production and installation method of perforation simulation target device for laboratory |
| CN208282685U (en) * | 2018-05-23 | 2018-12-25 | 中海石油（中国）有限公司天津分公司 | A kind of target of simulation reservoir confining pressure effect |
Non-Patent Citations (1)
| Title |
|---|
| 熊丹安等: "《疏松砂岩油藏大孔道形成机理及渗流规律研究》", 华南理工大学出版社, pages: 148 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112211600A (en) * | 2020-09-15 | 2021-01-12 | 中国石油天然气股份有限公司 | Radial confining pressure loading anti-impact structure of perforation target |
| CN114060006A (en) * | 2021-11-26 | 2022-02-18 | 西南石油大学 | Device for testing strength and sealing performance of cement sheath after perforation and using method thereof |
| CN114060006B (en) * | 2021-11-26 | 2023-11-03 | 西南石油大学 | Device for testing strength and sealing performance of cement sheath after perforation and application method thereof |
| CN115159913A (en) * | 2022-07-29 | 2022-10-11 | 物华能源科技有限公司 | High-strength columnar concrete formula for static penetration of perforating bullet and target |
| CN116482336A (en) * | 2023-06-26 | 2023-07-25 | 中海油田服务股份有限公司 | Multi-dimensional perforation damage evaluation method, device, computing equipment and storage medium |
| CN116482336B (en) * | 2023-06-26 | 2023-08-22 | 中海油田服务股份有限公司 | Multi-dimensional perforation damage evaluation method, device, computing equipment and storage medium |
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| CB03 | Change of inventor or designer information |
Inventor after: Ma Yingwen Inventor after: Wang Xi Inventor after: Wei Ling Inventor after: Lu Kun Inventor after: Fu Jianmin Inventor after: Liu Zhiqiang Inventor after: Ma Changliang Inventor after: Zhang Ming Inventor after: Sheng Tingqiang Inventor after: Wang Feng Inventor after: Li Bihong Inventor after: Li Shangjie Inventor before: Ma Yingwen Inventor before: Wang Xi Inventor before: Wei Ling Inventor before: Lu Kun Inventor before: Fu Jianmin Inventor before: Liu Zhiqiang Inventor before: Ma Changliang Inventor before: Zhang Ming Inventor before: Sheng Tingqiang Inventor before: Wang Feng Inventor before: Li Bihong Inventor before: Li Shangjie |
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