CN103993855A - Well drilling and well cementation mud-backflow-preventing device - Google Patents
Well drilling and well cementation mud-backflow-preventing device Download PDFInfo
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- CN103993855A CN103993855A CN201410187899.2A CN201410187899A CN103993855A CN 103993855 A CN103993855 A CN 103993855A CN 201410187899 A CN201410187899 A CN 201410187899A CN 103993855 A CN103993855 A CN 103993855A
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- valve seat
- steel core
- mud
- plug
- well
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Abstract
The invention relates to a well drilling and well cementation mud-backflow-preventing device. A valve assembly is installed on the lower portion of a valve seat, a jacket is installed in the valve seat, the valve assembly is pushed to be opened by the lower portion of the jacket, the jacket is connected to the valve seat through a pin, the valve seat is connected into a main body, the upper portion of the main body is connected to the lower portion of a sleeve, a rubber plug and a steel core are vulcanized together and placed in the sleeve, a locking groove is formed in the upper portion of the valve seat, an opening lock ring is installed on the steel core, the outer portion of the lower end of the opening lock ring is of a taper-shaped structure so that the opening lock ring can be pressed into a lock groove under the effect of the axial force, the diameter of the lower portion of the steel core is equal to the inner diameter of the valve seat, an upper sealing ring is installed on the lower portion of the steel core, the valve assembly is protected to be free of damage caused by washing of mud, the jacket is pushed to be opened by the steel core, an inner hole of the valve seat can be reliably closed through the valve assembly, a cement plug formed by the fact that the well cementation mud flows back to the sleeve from the lower portion of the valve seat can be prevented, the well cementation work is smoothly completed, the plug drilling operation is avoided, the well cementation quality can be guaranteed, normal production of an oil well after well cementation can be achieved, and the remarkable economic benefits are achieved.
Description
technical field:
The equipment that when the present invention is oil drilling, completion is used is the anti-mud counterflow unit of a kind of well drilling and cementing.
background technology:
Cementing plug is after cemented up slurry, cementing plug is pressed in sleeve pipe, then replace cement paste operation, cementing plug plays the effect of isolated water mud and drilling fluid, in addition in the time that cementing plug replaces to float collar place, due to the sealing function of plug, produce bruising phenomenon, indicate the end of cementing operation.The float collar that is connected to sleeve pipe bottom is one-way valve structures, and object is to flow backwards back in sleeve pipe for avoiding well cementing operation to finish rear cement paste.Due to the unicity of cementing plug and float collar function, there is the insecure problem of float collar one way valve sealing performance, cause well cementing operation to finish rear section cement paste and flow backwards back in sleeve pipe under differential pressure action, and the certain altitude that plug is returned back to top in sleeve pipe, cement plug in sleeve pipe, formed, need to increase to bore and fill in operation, make completion practice complexity, drilling cost is increased, also can affect cementing quality and oil well production, even can cause oil well to scrap, produce heavy economic losses.
summary of the invention:
The object of the invention is to design the anti-mud counterflow unit of a kind of well drilling and cementing, the mud that prevents from cementing the well flows backwards and in sleeve pipe, forms cement plug, and well completion work is completed smoothly.
The object of the present invention is achieved like this: comprise sleeve pipe, plug, steel core, pin, sheath, valve seat, valve assembly, main body, valve assembly is installed in the bottom of valve seat, sheath is arranged in valve seat, the bottom of sheath is pushed valve assembly open, sheath is connected on valve seat by pin, and valve seat is connected in main body, and the top of main body is connected under sleeve pipe, plug and steel core are sulfided into one, and plug, steel core are placed in sleeve pipe.
In the top of valve seat, there is locked groove, construction opening lock ring on steel core, the outside, lower end of opening lock ring is pyramidal structure, and it can be pressed in locked groove under responsive to axial force.
The lower diameter of steel core equates with the internal diameter of valve seat, and sealing ring is installed in the bottom of steel core.
Between valve seat and main body, lower seal is installed.
The invention has the beneficial effects as follows: the bottom of sheath is pushed valve assembly open; valve assembly is protected not to be washed away by mud and damages; sheath is pushed open by steel core; valve assembly can reliably be closed valve seat endoporus, and the mud that can prevent from cementing the well flows back in sleeve pipe and forms cement plug from valve seat bottom, and well completion work is completed smoothly; the present invention has avoided boring plug operation; can ensure cementing quality, after completion, oil well can normally be produced, and has significant economic benefit.
brief description of the drawings:
Fig. 1 is the assembling drawing of the embodiment of the present invention.
detailed description of the invention:
Below in conjunction with accompanying drawing, embodiments of the invention are described.
As shown in Figure 1, embodiments of the invention comprise sleeve pipe 1, plug 2, steel core 3, upper sealing ring 4, opening lock ring 5, pin 7, sheath 8, valve seat 9, lower seal 10, valve assembly 11, main body 12, valve assembly 11 is installed in the bottom of valve seat 9, valve assembly 11 is hinged with valve seat 9, sheath 8 is arranged in valve seat 9, the bottom of sheath 8 is pushed valve assembly 11 open, on valve assembly 11, there is torsionspring, torsionspring energy storage when the bottom of sheath 8 is pushed valve assembly 11 open on it, sheath 8 is connected on valve seat 9 by pin 7, valve seat 9 is connected in main body 12, between valve seat 9 and main body 12, lower seal 10 is installed, ensure not miss between valve seat 9 and main body 12, the top of main body 12 is connected to sleeve pipe 1 time, plug 2 is sulfided into one with steel core 3, plug 2 can not come off from steel core 3, plug 2, steel core 3 is placed in sleeve pipe 1, plug 2 is out of shape afterwards and sleeve pipe 1 forms sealing state.In the top of valve seat 9, there is locked groove 6, construction opening lock ring 5 on steel core 3, the outside, lower end of opening lock ring 5 is pyramidal structure, makes its reduced diameter under responsive to axial force can be pressed into 6 li of locked grooves.The lower diameter of steel core 3 equates with the internal diameter of valve seat 9, and sealing ring 4 is installed in the bottom of steel core 3.
During to sleeve pipe 1 interior slip casting, plug 2 is not put into sleeve pipe 1, and mud passes through in sheath 8, can not wash away valve assembly 11, and valve assembly 11 can reliably working.After finishing to the interior slip casting of sleeve pipe 1, plug 2(is with to steel core 3, upper sealing ring 4, opening lock ring 5) put into sleeve pipe 1, in sleeve pipe 1, squeeze into displacement fluid, promote plug 2, steel core 3, upper sealing ring 4, opening lock ring 5 is to descending, steel core 3 is pushed down sheath 8, pin 7 is cut off, sheath 8 falls, lose the constraint to valve assembly 11, valve assembly 11 torsionspring thereon drives the bottom entrance of lower rotation shut off valve seat 9, the bottom of steel core 3 is with upper sealing ring 4, opening lock ring 5 enters in valve seat 9, opening lock ring 5 enters in locked groove 6, steel core 3, upper sealing ring 4 is all the time in valve seat 9, the endoporus of shutoff valve seat 9, form two seals with valve assembly 11.Therefore, the present invention can prevent from cementing the well mud flow backwards.
Claims (4)
1. the anti-mud counterflow unit of well drilling and cementing, comprise sleeve pipe (1), plug (2), steel core (3), pin (7), sheath (8), valve seat (9), valve assembly (11), main body (12), it is characterized in that: valve assembly (11) is installed in the bottom of valve seat (9), sheath (8) is arranged in valve seat (9), the bottom of sheath (8) is pushed valve assembly (11) open, sheath (8) is connected on valve seat (9) by pin (7), valve seat (9) is connected in main body (12), the top of main body (12) is connected under sleeve pipe (1), plug (2) is sulfided into one with steel core (3), plug (2), steel core (3) is placed in sleeve pipe (1).
2. the anti-mud counterflow unit of well drilling and cementing according to claim 1, it is characterized in that: in the top of valve seat (9), have locked groove (6), the upper construction opening lock ring (5) of steel core (3), the outside, lower end of opening lock ring (5) is pyramidal structure, makes it under responsive to axial force, can be pressed into locked groove (6) inner.
3. the anti-mud counterflow unit of well drilling and cementing according to claim 1, is characterized in that: the lower diameter of steel core (3) equates with the internal diameter of valve seat (9), and sealing ring (4) is installed in the bottom of steel core (3).
4. the anti-mud counterflow unit of well drilling and cementing according to claim 1, is characterized in that: between valve seat (9) and main body (12), lower seal (10) is installed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410187899.2A CN103993855A (en) | 2014-05-07 | 2014-05-07 | Well drilling and well cementation mud-backflow-preventing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410187899.2A CN103993855A (en) | 2014-05-07 | 2014-05-07 | Well drilling and well cementation mud-backflow-preventing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103993855A true CN103993855A (en) | 2014-08-20 |
Family
ID=51308163
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410187899.2A Pending CN103993855A (en) | 2014-05-07 | 2014-05-07 | Well drilling and well cementation mud-backflow-preventing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103993855A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4706747A (en) * | 1985-11-25 | 1987-11-17 | Weatherford U.S., Inc. | Cementing plug |
| CN2216141Y (en) * | 1995-01-26 | 1995-12-27 | 钟德华 | Self-filling casing back-pressure valve |
| CN2625569Y (en) * | 2003-06-06 | 2004-07-14 | 辽河石油勘探局钻井一公司 | Impacting shearing device for tail pipe well completion |
| CN2881078Y (en) * | 2006-04-10 | 2007-03-21 | 新疆石油管理局钻井工艺研究院 | Self-locking rubber plug |
| CN200982177Y (en) * | 2006-08-18 | 2007-11-28 | 辽河石油勘探局 | Bumping device for well cementing |
| CN201428426Y (en) * | 2009-05-30 | 2010-03-24 | 中国石油集团西部钻探工程有限公司克拉玛依钻井工艺研究院 | Rubber plug assembly |
| CN201738871U (en) * | 2010-06-17 | 2011-02-09 | 中国石油集团川庆钻探工程有限公司井下作业公司 | Anti-rotating well cementation rubber stopper with self-locking mechanism |
-
2014
- 2014-05-07 CN CN201410187899.2A patent/CN103993855A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4706747A (en) * | 1985-11-25 | 1987-11-17 | Weatherford U.S., Inc. | Cementing plug |
| CN2216141Y (en) * | 1995-01-26 | 1995-12-27 | 钟德华 | Self-filling casing back-pressure valve |
| CN2625569Y (en) * | 2003-06-06 | 2004-07-14 | 辽河石油勘探局钻井一公司 | Impacting shearing device for tail pipe well completion |
| CN2881078Y (en) * | 2006-04-10 | 2007-03-21 | 新疆石油管理局钻井工艺研究院 | Self-locking rubber plug |
| CN200982177Y (en) * | 2006-08-18 | 2007-11-28 | 辽河石油勘探局 | Bumping device for well cementing |
| CN201428426Y (en) * | 2009-05-30 | 2010-03-24 | 中国石油集团西部钻探工程有限公司克拉玛依钻井工艺研究院 | Rubber plug assembly |
| CN201738871U (en) * | 2010-06-17 | 2011-02-09 | 中国石油集团川庆钻探工程有限公司井下作业公司 | Anti-rotating well cementation rubber stopper with self-locking mechanism |
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| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140820 |