CN101748989A - Branch well window sealing method - Google Patents
Branch well window sealing method Download PDFInfo
- Publication number
- CN101748989A CN101748989A CN200910220789A CN200910220789A CN101748989A CN 101748989 A CN101748989 A CN 101748989A CN 200910220789 A CN200910220789 A CN 200910220789A CN 200910220789 A CN200910220789 A CN 200910220789A CN 101748989 A CN101748989 A CN 101748989A
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- CN
- China
- Prior art keywords
- sealing device
- window
- sealing
- well
- branch well
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- Pending
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- 238000007789 sealing Methods 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000005553 drilling Methods 0.000 claims abstract description 5
- 238000003466 welding Methods 0.000 claims abstract description 5
- 238000004512 die casting Methods 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims abstract description 4
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 238000012856 packing Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 2
- 238000005516 engineering process Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
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- Excavating Of Shafts Or Tunnels (AREA)
Abstract
A method for sealing the window of branch well for oil or water well features that a sealing unit is used to make the window of branch well composed of main well under the window, branch well and main well on the window; the sealing device is made of a material which has certain elasticity and plasticity and can be expanded and recovered to deform, and is formed by die casting or pipe welding; after the sealing device and the feeding tool are put down to the window of the branch well, the hydraulic expansion sealing device is firstly used, and the drilling tool is simultaneously put down to enable the sealing device to go down until the sealing device reaches the designed position, after the sealing device is fully expanded, the feeding pipe column is pressed down to cut off a connecting pin between the feeding tool and the sealing device, so that the feeding tool is separated from the sealing device, the feeding pipe column and the feeding tool are lifted out of the well, and then the feeding expansion tool pushes the expansion cone to expand the sealing device by utilizing hydraulic pressure so that the expansion of the sealing device is different from the inner wall of the sleeve pipe at the window to be fully attached and ensure the communication of the two branches. It can be used for sealing operation of branch well of oil-water well.
Description
Technical field:
The present invention relates to a kind of branch well window sealing method that oil, well branch well window seal are used.
Background technology:
Multilateral Wells has become the frontier technology of world's oil extraction with its higher oil well well yield, lower oil extraction cost, and the sealing of its window is the leading indicator of Multilateral Wells completion degree height.Present domestic Multilateral Wells technology has only the level Four level, and its window place does not have reliable mechanical seal, and six-grade branch well adopts abroad is in the main borehole position reaming of windowing, and is lowered to the mechanical seal that prefabricated profiled underground branching device for multi is realized the window place.This sealing device be lowered to the size that tends to reduce each branch well hole, because drill bit often passes through from fabricated device, can cause the wearing and tearing of this device, thereby influence the sealing at window place simultaneously.The present invention has proposed new method to branch well window seal.
Summary of the invention:
The purpose of this invention is to provide a kind of branch well window sealing method, this method has solved the problem that the branch well window place that exists in the prior art does not have reliable mechanical seal.
The technical solution adopted for the present invention to solve the technical problems is: a kind of branch well window sealing method is to realize by sealing device; After Multilateral Wells is all bored completion, be lowered to the pre-formed sealing device in a ground at the branch well window place: this device by main borehole, branch well hole, window under the window on main borehole form; Main the sealing device of Multilateral Wells be to adopt to have certain elastoplasticity, inflatablely can recover the material of distortion, with die casting or tubing welding fabrication; Sealing device and running tool are by welding or be threaded, utilize drilling tool with after arriving the branch well window place under sealing device and the running tool thereof, utilize the bearing unit of sealing device to find its position of should writing out a prescription, use earlier the hydraulic buckling sealing device, transfer drilling tool simultaneously, make sealing device descending, until design attitude, after the sealing device complete expansion, press down again and send into tubing string and cut off the pin that is connected between running tool and sealing device, running tool and sealing device are broken away from, to send into tubing string and the instrument of packing into proposes in well, be lowered to bloat tool again and utilize the hydraulic drive awl Expansion sealing device that expands, it is expand into fit fully with window place internal surface of sleeve pipe and guarantee being communicated with of two bifurcation, thereby realize the sealing at window jag place.
The invention has the beneficial effects as follows: the branch well window that utilizes this method to finish can be realized hydraulic seal, and good sealing effect; The Multilateral Wells of finishing with this method is very little to the influence of window place borehole size.
Description of drawings:
Fig. 1 is a structural representation after the window sealing device expands.
Fig. 2 is a window sealing device ground precast construction schematic diagram.
Fig. 3 is lowered to the preceding Multilateral Wells completion tubular column schematic diagram of sealing device.
Main borehole among the figure 1, under the window, 2, branch well hole, 3, main borehole on the window.
The specific embodiment:
A kind of branch well window sealing method is realized by sealing device: after Multilateral Wells is all bored completion, be lowered to the prefabricated profiled sealing device in ground at the branch well window place; This device is made up of main borehole 3 on main borehole under the window 1, branch well hole 2, the window; The sealing device is to adopt to have certain elastoplasticity, and inflatable energy recovers the material of distortion, with die casting or tubing welding fabrication; Sealing device and running tool are down behind the branch well window place, use earlier the hydraulic buckling sealing device, transfer drilling tool simultaneously, make sealing device descending, until design attitude, after the sealing device complete expansion, press down again and send into tubing string and cut off the pin that is connected between running tool and sealing device, running tool and sealing device are broken away from, to send into tubing string and the instrument of packing into proposes in well, be lowered to bloat tool again and utilize the hydraulic drive awl Expansion sealing device that expands, it is expand into fit fully with window place internal surface of sleeve pipe and guarantee being communicated with of two bifurcation, thereby realize the sealing at window jag place.
Claims (1)
1. branch well window sealing method, this method shows by sealing device, this device, form by main borehole (3) on main borehole under the window (1), branch well hole (2), the window, it is characterized in that: after Multilateral Wells is all bored completion, be lowered to the prefabricated profiled sealing device in ground at the branch well window place; The sealing device is to adopt to have certain elastoplasticity, and inflatable energy recovers the material of distortion, with die casting or tubing welding fabrication; Sealing device and running tool are down behind the branch well window place, use earlier the hydraulic buckling sealing device, transfer drilling tool simultaneously, make sealing device descending, until design attitude, after the sealing device complete expansion, press down again and send into tubing string and cut off the pin that is connected between running tool and sealing device, running tool and sealing device are broken away from, to send into tubing string and the instrument of packing into proposes in well, be lowered to bloat tool again and utilize the hydraulic drive awl Expansion sealing device that expands, it is expand into fit fully with window place internal surface of sleeve pipe and guarantee being communicated with of two bifurcation, thereby realize the sealing at window jag place.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910220789A CN101748989A (en) | 2009-12-15 | 2009-12-15 | Branch well window sealing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910220789A CN101748989A (en) | 2009-12-15 | 2009-12-15 | Branch well window sealing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101748989A true CN101748989A (en) | 2010-06-23 |
Family
ID=42476548
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910220789A Pending CN101748989A (en) | 2009-12-15 | 2009-12-15 | Branch well window sealing method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101748989A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102102490A (en) * | 2010-12-17 | 2011-06-22 | 中国石油集团长城钻探工程有限公司 | Feeding and expanding method of forked three-way mechanism based on downward orientation |
| CN102425391A (en) * | 2011-11-11 | 2012-04-25 | 中国石油集团长城钻探工程有限公司 | Branch well window sealing method based on memory alloy |
| CN103244070A (en) * | 2013-05-07 | 2013-08-14 | 中国石油集团长城钻探工程有限公司 | Five-level multilateral well seal tool |
| CN104033121A (en) * | 2013-03-04 | 2014-09-10 | 中国石油化工股份有限公司 | Expansion device for underground branch system |
| CN104234649A (en) * | 2014-09-02 | 2014-12-24 | 中国石油集团长城钻探工程有限公司 | Method for tripping in straddles of lambdoidal sealing device for multilateral well |
-
2009
- 2009-12-15 CN CN200910220789A patent/CN101748989A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102102490A (en) * | 2010-12-17 | 2011-06-22 | 中国石油集团长城钻探工程有限公司 | Feeding and expanding method of forked three-way mechanism based on downward orientation |
| CN102425391A (en) * | 2011-11-11 | 2012-04-25 | 中国石油集团长城钻探工程有限公司 | Branch well window sealing method based on memory alloy |
| CN104033121A (en) * | 2013-03-04 | 2014-09-10 | 中国石油化工股份有限公司 | Expansion device for underground branch system |
| CN103244070A (en) * | 2013-05-07 | 2013-08-14 | 中国石油集团长城钻探工程有限公司 | Five-level multilateral well seal tool |
| CN103244070B (en) * | 2013-05-07 | 2015-09-23 | 中国石油集团长城钻探工程有限公司 | A kind of five-level multilateral well seal tool |
| CN104234649A (en) * | 2014-09-02 | 2014-12-24 | 中国石油集团长城钻探工程有限公司 | Method for tripping in straddles of lambdoidal sealing device for multilateral well |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20100623 |