WO2008067772A1 - Buffer unit for perforation testing system of oil/gas well - Google Patents
Buffer unit for perforation testing system of oil/gas well Download PDFInfo
- Publication number
- WO2008067772A1 WO2008067772A1 PCT/CN2007/071189 CN2007071189W WO2008067772A1 WO 2008067772 A1 WO2008067772 A1 WO 2008067772A1 CN 2007071189 W CN2007071189 W CN 2007071189W WO 2008067772 A1 WO2008067772 A1 WO 2008067772A1
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- WIPO (PCT)
- Prior art keywords
- cylinder
- telescopic cylinder
- buffer
- telescopic
- buffer head
- Prior art date
Links
- 238000012360 testing method Methods 0.000 title claims abstract description 19
- 230000013011 mating Effects 0.000 claims description 5
- 230000003139 buffering effect Effects 0.000 abstract description 9
- 238000013016 damping Methods 0.000 description 7
- 239000012530 fluid Substances 0.000 description 6
- 230000035939 shock Effects 0.000 description 5
- 239000002131 composite material Substances 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 239000010410 layer Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000006096 absorbing agent Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003721 gunpowder Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/11—Perforators; Permeators
- E21B43/119—Details, e.g. for locating perforating place or direction
Definitions
- the utility model relates to the technical field of oil exploitation, in particular to a buffer device for a test system for oil and gas well composite perforation. Background technique
- composite perforation-testing is an important aspect of current research in the field of perforation.
- Composite perforation – The test is to connect the perforator, pressure gauge and other test instruments in the column, feed them into the wellbore, then detonate the perforating projectile, gunpowder, and then test the relevant parameters of the formation.
- the perforator uses a perforating projectile and gunpowder to generate a large amount of high-temperature and high-pressure gas to act on the oil and gas layer. When the perforator acts, it will produce severe longitudinal and lateral impact on the downhole string, especially the vibration caused by the longitudinal impact on the test instrument. The impact is even greater.
- the existing longitudinal shock absorbers for downhole testing operations are composed of a sealing tube, a shock absorber, a pressure guiding joint, a shock absorbing spring, a damping rubber, and a sealant, etc., and the disadvantages are as follows: 1. The structure is complicated, It is difficult to manufacture and cumbersome to connect; 2. The reaction by spring damping is slow, the buffering capacity is limited, and it can only buffer 200mm; 3. The cross-sectional diameter is large, which is not suitable for small-aperture oil and gas well operations.
- Chinese patent CN2540630 discloses a downhole test electronic pressure gauge shock protection protection cylinder, which is added with two layers of protection cylinders on the original single layer protection cylinder, and each layer of protection cylinder is composed of different combinations of rubber and spring. Structured. This structure of the protection cylinder is more complicated and the longitudinal buffering capacity is extremely limited. Utility model content
- the problem to be solved by the utility model is to provide a buffering device for a test system for oil and gas well perforation with strong buffering capability and fast response to longitudinal impact.
- the buffer device of the test system for perforating the oil and gas well has an upper joint and a lower joint
- the special feature of the utility model further comprises an outer cylinder tube connected with the upper joint, and An inner cylinder connected to the outer cylinder and a telescopic cylinder connected to the lower joint, wherein the upper end of the telescopic cylinder is connected with a buffer head, and the buffer head is slidably engaged with the outer cylinder, the telescopic cylinder Slidingly engaging with the inner cylinder tube, the inner surface of the outer cylinder tube and the outer surface of the telescopic cylinder, the upper end surface of the inner cylinder tube and the lower end surface of the buffer head enclose a closed buffer chamber, and the telescopic cylinder is provided with the above a diversion hole that communicates with the chamber.
- the high-pressure fluid enters the telescopic cylinder from the lower joint, and then enters the buffer chamber by the diversion hole of the telescopic cylinder.
- the fluid in the buffer chamber pushes the buffer head upward, and the telescopic cylinder goes up, thereby achieving the purpose of buffer damping.
- the number of the air guiding holes on the telescopic cylinder may be 2 to 20, and the diameter of the air guiding hole may be 6 to 30 mm.
- the utility model adopts a telescopic cylinder structure, uses a diversion hole having a damping function to introduce a high-pressure fluid into the buffer cavity, and pushes the telescopic cylinder upward, which not only has a simple structure, but also has a large buffering capacity.
- the test buffer stroke can reach 2 meters, which ensures the safety of the test instrument.
- the speed of the fluid passing through the diversion holes can be controlled by adjusting the number of diversion holes (blocking the partial diversion holes as appropriate) to achieve the best cushioning effect depending on the actual situation.
- the upper joint 1 and the lower joint 7 are respectively provided with pipe threads for connection with a tester or other device.
- the upper joint 1 and the outer cylinder tube 2 are connected by a threaded sealing member, and the lower joint 7 and the telescopic cylinder 4 are also connected by a thread and a sealing member.
- the upper end of the telescopic cylinder 4 is provided with a buffer head 3, which is connected with the telescopic cylinder. Threaded connection.
- the upper half of the inner cylinder 5 is located between the outer cylinder 2 and the telescopic cylinder 4, and is screwed to the outer cylinder.
- the telescopic cylinder 4 and the inner cylinder tube are in a sliding fit, and the buffer head 3 and the outer cylinder tube 2 are in a sliding fit, that is, the buffer head 3 corresponds to a piston, and the telescopic cylinder 4 corresponds to a piston rod.
- the telescopic cylinder 4 is provided with eight flow guiding holes 8 communicating with the buffer chamber 6, and the eight guiding holes are circumferentially Cloth, which has a diameter of 10 mm.
- the high-pressure fluid in the action of the perforator enters the inner cavity of the telescopic cylinder 4 from the lower joint, and then enters the buffer chamber 6 by the diversion hole 8 of the telescopic cylinder.
- the fluid in the buffer chamber pushes the buffer head upward, and the telescopic cylinder follows Upward, during this process, the vibration energy in the longitudinal direction is absorbed, thereby achieving the purpose of buffer damping.
- a mating surface between the buffer head 3 and the outer cylinder 2 and a mating surface between the telescopic cylinder 4 and the inner cylinder 5 may be provided with a scraping surface. Rings 10, 11.
- the utility model can be used not only for buffering and damping in high-energy and high-pressure harsh environments in the process of composite perforating, but also for buffering and damping of high-energy gas fracturing and unblocking in oil and gas wells.
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
A buffer unit for perforation testing system of oil/gas well comprises an upper adaptor (1), a lower adaptor (7), an outer cylinder (2) connected to the upper adaptor (1), an inner cylinder (5) connected to the outer cylinder (2) and a telescopic cylinder (4) connected to the lower adaptor (7). A buffer head (3) connected to the upside of the telescopic cylinder (4) is slidable fitting together with the outer cylinder (2). The telescopic cylinder (4) is slidable fitted together with the inner cylinder (5). A closed cushion chamber (6) is formed between the inner surface of the outer cylinder (2) and the outer surface of the telescopic cylinder (4) and also between the upper end surface of the inner cylinder (5) and the lower end surface of the buffer head (3). Diversion holes(8) which communicate with the cushion chamber (6) are set on the telescopic cylinder (4). The high pressure gas generated by perforating flows from the lower adaptor (7) into the telescopic cylinder (4), and then flows into the cushion chamber (6) through diversion holes of the telescopic cylinder (4), and then pushes the buffer head (3) upward. The telescopic cylinder (4) is moved upwardly together with the buffer head (3). The upward vibration energy in the longitudinal direction is absorbed to achieve the function of buffering.
Description
油气井射孔用测试系统的緩冲装置 技术领域 Buffer device for test system for oil and gas well perforation
本实用新型涉及石油开采技术领域， 特别是一种油气井复合射孔用测 试系统的緩冲装置。 背景技术 The utility model relates to the technical field of oil exploitation, in particular to a buffer device for a test system for oil and gas well composite perforation. Background technique
在石油开采中， 复合射孔——测试联作是目前射孔领域研究的一个重 要方面。 复合射孔——测试联作是将射孔器、 压力计等测试仪器联接在管 柱中， 一起送入井筒， 然后引爆射孔弹、 火药， 紧接着对地层有关参数进 行测试。射孔器是利用射孔弹和火药燃烧产生大量高温高压气体作用于油 气层， 射孔器作用时会对井下管柱产生剧烈的纵向和横向冲击， 特别是纵 向冲击引起的震动对测试仪器的影响更大。 所以在测试中需要采取保护测 试仪器的措施， 防止射孔时测试仪器因震动、 碰撞而毁坏。 现有的用于井 下测试作业的纵向防震器， 是由密封管、 减震器、 导压接头、 减震弹簧、 减震胶圏和密封胶圏等组成， 其缺点在于： 1.结构复杂、 制造难度大、 连 接烦瑣； 2.通过弹簧减震作用的反应较慢， 緩冲能力有限， 只能緩冲 200mm; 3.截面直径大， 不适于小孔径油气井作业。 中国专利 CN2540630 公开了一种井下测试电子压力计减震保护托筒 , 它是在原来单层保护筒的 上多加了两层保护筒， 且每层保护筒之间是由橡胶加弹簧的不同组合 结构而成。 这种保护托筒的结构更为复杂， 而且纵向緩冲能力极其有限。 实用新型内容 In oil exploration, composite perforation-testing is an important aspect of current research in the field of perforation. Composite perforation – The test is to connect the perforator, pressure gauge and other test instruments in the column, feed them into the wellbore, then detonate the perforating projectile, gunpowder, and then test the relevant parameters of the formation. The perforator uses a perforating projectile and gunpowder to generate a large amount of high-temperature and high-pressure gas to act on the oil and gas layer. When the perforator acts, it will produce severe longitudinal and lateral impact on the downhole string, especially the vibration caused by the longitudinal impact on the test instrument. The impact is even greater. Therefore, measures to protect the test instrument are required in the test to prevent the test instrument from being damaged by vibration and collision when perforating. The existing longitudinal shock absorbers for downhole testing operations are composed of a sealing tube, a shock absorber, a pressure guiding joint, a shock absorbing spring, a damping rubber, and a sealant, etc., and the disadvantages are as follows: 1. The structure is complicated, It is difficult to manufacture and cumbersome to connect; 2. The reaction by spring damping is slow, the buffering capacity is limited, and it can only buffer 200mm; 3. The cross-sectional diameter is large, which is not suitable for small-aperture oil and gas well operations. Chinese patent CN2540630 discloses a downhole test electronic pressure gauge shock protection protection cylinder, which is added with two layers of protection cylinders on the original single layer protection cylinder, and each layer of protection cylinder is composed of different combinations of rubber and spring. Structured. This structure of the protection cylinder is more complicated and the longitudinal buffering capacity is extremely limited. Utility model content
本实用新型所要解决的问题是： 提供一种緩冲能力强、 对纵向冲击反 应快的油气井射孔用测试系统的緩冲装置。 The problem to be solved by the utility model is to provide a buffering device for a test system for oil and gas well perforation with strong buffering capability and fast response to longitudinal impact.
解决上述问题的技术方案是： 所提供的油气井射孔用测试系统的緩冲 装置具有上接头和下接头， 本实用新型的特别之处是还包括一个与上接头 连接的外缸筒、 与外缸筒连接的内缸筒和与下接头连接的伸缩筒， 其中伸 缩筒的上端连接一个緩冲头， 该緩冲头与上述的外缸筒滑动配合， 伸缩筒
与上述的内缸筒滑动配合， 上述外缸筒内表面与伸缩筒外表面、 内缸筒上 端面和緩冲头下端面之间围成一个封闭的緩冲腔， 伸缩筒上设有与上述緩 冲腔相连通的导流孔。 高压流体从下接头进入伸缩筒内， 再由伸缩筒的导 流孔进入緩冲腔， 緩冲腔内的流体推动緩冲头上行， 伸缩筒随之上行， 从 而达到緩冲减震的目的。 The technical solution for solving the above problem is: the buffer device of the test system for perforating the oil and gas well provided has an upper joint and a lower joint, and the special feature of the utility model further comprises an outer cylinder tube connected with the upper joint, and An inner cylinder connected to the outer cylinder and a telescopic cylinder connected to the lower joint, wherein the upper end of the telescopic cylinder is connected with a buffer head, and the buffer head is slidably engaged with the outer cylinder, the telescopic cylinder Slidingly engaging with the inner cylinder tube, the inner surface of the outer cylinder tube and the outer surface of the telescopic cylinder, the upper end surface of the inner cylinder tube and the lower end surface of the buffer head enclose a closed buffer chamber, and the telescopic cylinder is provided with the above a diversion hole that communicates with the chamber. The high-pressure fluid enters the telescopic cylinder from the lower joint, and then enters the buffer chamber by the diversion hole of the telescopic cylinder. The fluid in the buffer chamber pushes the buffer head upward, and the telescopic cylinder goes up, thereby achieving the purpose of buffer damping.
上述伸缩筒上的导流孔的数量可为 2〜20个， 导流孔的直径可为 6〜30 毫米。 The number of the air guiding holes on the telescopic cylinder may be 2 to 20, and the diameter of the air guiding hole may be 6 to 30 mm.
与现有技术相比， 本实用新型由于采用了伸缩筒式结构， 利用具有阻 尼作用的导流孔将高压流体引入緩冲腔， 并推动伸缩筒上行， 不但结构简 单， 而且緩冲能力大， 经试验緩冲行程可达 2米， 保证了测试仪器的安全 性。 另外， 通过调整导流孔的数量（根据情况可封堵部分导流孔）可以控 制流体通过导流孔的速度， 以便根据实际情况实现最好的緩冲效果。 附图说明 Compared with the prior art, the utility model adopts a telescopic cylinder structure, uses a diversion hole having a damping function to introduce a high-pressure fluid into the buffer cavity, and pushes the telescopic cylinder upward, which not only has a simple structure, but also has a large buffering capacity. The test buffer stroke can reach 2 meters, which ensures the safety of the test instrument. In addition, the speed of the fluid passing through the diversion holes can be controlled by adjusting the number of diversion holes (blocking the partial diversion holes as appropriate) to achieve the best cushioning effect depending on the actual situation. DRAWINGS
图 1是本实用新型一个实施例的整体结构图。 具体实施方式 1 is an overall structural view of an embodiment of the present invention. detailed description
如图 1所示： 上接头 1和下接头 7上分别设有管螺纹， 用于与测试器 或其它装置连接。 上接头 1与外缸筒 2之间采用螺纹加密封件连接， 下接 头 7与伸缩筒 4之间同样采用螺纹加密封件连接， 伸缩筒 4上端装有緩冲 头 3 , 它与伸缩筒之间采用螺纹连接。 内缸筒 5的上半部分位于外缸筒 2 和伸缩筒 4之间， 它与外缸筒之间采用螺纹连接。 伸缩筒 4与内缸筒之间 为滑动配合， 緩冲头 3与外缸筒 2之间为滑动配合， 即， 緩冲头 3相当于 一个活塞， 伸缩筒 4相当于一个活塞杆。 外缸筒 2与伸缩筒 4之间还有一 个封闭的緩冲腔 6， 伸缩筒 4上设有八个与上述緩冲腔 6相连通的导流孔 8, 八个导流孔沿圆周均布， 其直径为 10毫米。 射孔器作用时的高压流体 从下接头 Ί进入伸缩筒 4的内腔， 再由伸缩筒的导流孔 8进入緩冲腔 6， 緩冲腔内的流体推动緩冲头上行， 伸缩筒随之上行， 在这个过程中纵向上 的震动能量被吸收， 从而达到緩冲减震的目的。
为了有效地保护各运动部件与相关配合面的清洁和密封效果， 可在緩 冲头 3与外缸筒 2之间的配合面以及伸缩筒 4与内缸筒 5之间的配合面设 有刮环 10、 11。 As shown in Figure 1: The upper joint 1 and the lower joint 7 are respectively provided with pipe threads for connection with a tester or other device. The upper joint 1 and the outer cylinder tube 2 are connected by a threaded sealing member, and the lower joint 7 and the telescopic cylinder 4 are also connected by a thread and a sealing member. The upper end of the telescopic cylinder 4 is provided with a buffer head 3, which is connected with the telescopic cylinder. Threaded connection. The upper half of the inner cylinder 5 is located between the outer cylinder 2 and the telescopic cylinder 4, and is screwed to the outer cylinder. The telescopic cylinder 4 and the inner cylinder tube are in a sliding fit, and the buffer head 3 and the outer cylinder tube 2 are in a sliding fit, that is, the buffer head 3 corresponds to a piston, and the telescopic cylinder 4 corresponds to a piston rod. There is also a closed buffer chamber 6 between the outer cylinder tube 2 and the telescopic cylinder 4. The telescopic cylinder 4 is provided with eight flow guiding holes 8 communicating with the buffer chamber 6, and the eight guiding holes are circumferentially Cloth, which has a diameter of 10 mm. The high-pressure fluid in the action of the perforator enters the inner cavity of the telescopic cylinder 4 from the lower joint, and then enters the buffer chamber 6 by the diversion hole 8 of the telescopic cylinder. The fluid in the buffer chamber pushes the buffer head upward, and the telescopic cylinder follows Upward, during this process, the vibration energy in the longitudinal direction is absorbed, thereby achieving the purpose of buffer damping. In order to effectively protect the cleaning and sealing effects of the moving parts and the associated mating surfaces, a mating surface between the buffer head 3 and the outer cylinder 2 and a mating surface between the telescopic cylinder 4 and the inner cylinder 5 may be provided with a scraping surface. Rings 10, 11.
由于本緩冲装置的緩冲行程较长， 为了便于运输， 可在内缸筒 5下端 部装有一个带内螺纹的固定环 9， 下接头 Ί的上端部设有与该固定环 9配 合的外螺纹部分 71。 运输时， 将伸缩筒 4完全回缩， 转动固定环 9， 使其 下端部与下接头 7的外螺纹部分 71连接在一起， 并用紧定螺钉 91锁死。 使用时， 松开固定环 9， 伸缩筒 4伸出到下限位置。 Since the buffering stroke of the shock absorbing device is long, a fixing ring 9 with an internal thread is provided at the lower end of the inner cylinder barrel 5 for the purpose of transportation, and the upper end portion of the lower joint 设有 is provided with the fixing ring 9 Externally threaded portion 71. When transporting, the telescopic cylinder 4 is completely retracted, and the fixing ring 9 is rotated so that the lower end portion thereof is coupled with the externally threaded portion 71 of the lower joint 7, and is locked by the set screw 91. When in use, loosen the retaining ring 9, and the telescopic cylinder 4 extends to the lower limit position.
本实用新型不但可用于复合射孔过程中高能高压恶劣环境中的緩冲 减震，还可应用于油气井的高能气体压裂、解堵等强震动场合的緩冲减震。
The utility model can be used not only for buffering and damping in high-energy and high-pressure harsh environments in the process of composite perforating, but also for buffering and damping of high-energy gas fracturing and unblocking in oil and gas wells.
Claims
权 利 要 求 Rights request
1、 一种油气井射孔用测试系统的緩冲装置， 具有上接头（1 )和下接 头 （7), 其特征是还包括一个与上接头 （1 )连接的外缸筒 （2)、 与外缸 筒 （2)连接的内缸筒 （5)和与下接头 （7)连接的伸缩筒 （4), 其中伸 缩筒的上端连接一个緩冲头（3), 该緩冲头（3)与上述的外缸筒 （2)滑 动配合， 伸缩筒 （4)与上述的内缸筒（5)滑动配合， 上述外缸筒内表面 与伸缩筒外表面、 内缸筒上端面和緩冲头下端面之间围成一个封闭的緩冲 腔（6), 伸缩筒上设有与上述緩冲腔（6)相连通的导流孔（8)。 A buffer device for a test system for perforating oil and gas wells, comprising an upper joint (1) and a lower joint (7), characterized in that it further comprises an outer cylinder (2) connected to the upper joint (1), An inner cylinder (5) connected to the outer cylinder (2) and a telescopic cylinder (4) connected to the lower joint (7), wherein the upper end of the telescopic cylinder is connected with a buffer head (3), the buffer head (3) a sliding fit with the outer cylinder (2), the telescopic cylinder (4) is slidably engaged with the inner cylinder (5), the outer surface of the outer cylinder and the outer surface of the telescopic cylinder, the upper end surface of the inner cylinder and the buffer head A closed buffer chamber (6) is defined between the lower end faces, and a bellows (8) communicating with the buffer chamber (6) is disposed on the telescopic cylinder.
2、 根据权利要求 1所述的緩冲装置， 其特征是所说的伸缩筒（4)上 的导流孔（ 8 ) 的数量为 2〜20个。 2. A cushioning device according to claim 1, characterized in that the number of the flow guiding holes (8) on the telescopic cylinder (4) is 2 to 20.
3、根据权利要求 1或 2所述的緩冲装置，其特征是所说的伸缩筒（ 4 ) 上的导流孔（ 8 ) 的直径为 6〜30毫米。 A cushioning device according to claim 1 or 2, wherein the diameter of the flow guiding hole (8) on said telescopic cylinder (4) is 6 to 30 mm.
4、 根据权利要求 3所述的緩冲装置， 其特征是在緩冲头（3)与外缸 筒 （2)之间的配合面以及伸缩筒 （4) 与内缸筒 （5)之间的配合面设有 刮环 ( 10、 11 )。 4. A cushioning device according to claim 3, characterized by a mating surface between the buffer head (3) and the outer cylinder (2) and between the telescopic cylinder (4) and the inner cylinder (5) The mating surface is provided with a scraper ring (10, 11).
5、 根据权利要求 4所述的緩冲装置， 其特征是在内缸筒（5)下端部 装有一个带内螺纹的固定环 （9)， 下接头 （7) 的上端部设有与该固定环 5. The cushioning device according to claim 4, characterized in that the lower end of the inner cylinder (5) is provided with a fixed ring (9) with an internal thread, and the upper end of the lower joint (7) is provided with M
(9) 配合的外螺纹部分（71)。
(9) Fitted external threaded part (71).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2006201362941U CN200975252Y (en) | 2006-12-06 | 2006-12-06 | Buffering device of testing system for oil gas well perforation |
| CN200620136294.1 | 2006-12-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2008067772A1 true WO2008067772A1 (en) | 2008-06-12 |
Family
ID=38901538
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/CN2007/071189 WO2008067772A1 (en) | 2006-12-06 | 2007-12-06 | Buffer unit for perforation testing system of oil/gas well |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN200975252Y (en) |
| WO (1) | WO2008067772A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103174402A (en) * | 2011-12-23 | 2013-06-26 | 中国石油化工股份有限公司 | Longitudinal absorber for reducing perforation instantaneous shock vibration force |
| CN111140202A (en) * | 2020-01-13 | 2020-05-12 | 中国石油天然气股份有限公司 | Deep well and ultra-deep well integrated production completion pipe string and operation method thereof |
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| CN2366315Y (en) * | 1999-03-30 | 2000-03-01 | 黄卫明 | Automobile shock absorber |
| US6223818B1 (en) * | 1998-01-16 | 2001-05-01 | Joe Hrupp | Perforating gun brake |
| CN2455933Y (en) * | 2000-11-22 | 2001-10-24 | 许苏明 | Choke |
| US6412614B1 (en) * | 1999-09-20 | 2002-07-02 | Core Laboratories Canada Ltd. | Downhole shock absorber |
| CN2519020Y (en) * | 2001-08-10 | 2002-10-30 | 吉林石油集团有限责任公司试油处 | Downhole damper |
-
2006
- 2006-12-06 CN CNU2006201362941U patent/CN200975252Y/en not_active Expired - Lifetime
-
2007
- 2007-12-06 WO PCT/CN2007/071189 patent/WO2008067772A1/en active Application Filing
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2296003Y (en) * | 1997-05-17 | 1998-10-28 | 大庆石油管理局试油试采公司 | Protector for electronic pressure meter at hole shooting period |
| US6223818B1 (en) * | 1998-01-16 | 2001-05-01 | Joe Hrupp | Perforating gun brake |
| CN2366315Y (en) * | 1999-03-30 | 2000-03-01 | 黄卫明 | Automobile shock absorber |
| US6412614B1 (en) * | 1999-09-20 | 2002-07-02 | Core Laboratories Canada Ltd. | Downhole shock absorber |
| CN2455933Y (en) * | 2000-11-22 | 2001-10-24 | 许苏明 | Choke |
| CN2519020Y (en) * | 2001-08-10 | 2002-10-30 | 吉林石油集团有限责任公司试油处 | Downhole damper |
Also Published As
| Publication number | Publication date |
|---|---|
| CN200975252Y (en) | 2007-11-14 |
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