CN202900116U - Special casing milling head for broken well - Google Patents
Special casing milling head for broken well Download PDFInfo
- Publication number
- CN202900116U CN202900116U CN 201220639823 CN201220639823U CN202900116U CN 202900116 U CN202900116 U CN 202900116U CN 201220639823 CN201220639823 CN 201220639823 CN 201220639823 U CN201220639823 U CN 201220639823U CN 202900116 U CN202900116 U CN 202900116U
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- milling head
- milling
- casing
- welded
- well
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Abstract
The utility model discloses a special casing milling head for a broken well, solving the problem that the existing casing milling head only absorbs fish heads, casing-cut rocks and cement sheaths but can not casing-mill a packer and a centering guide outside a pipe. The special casing milling head comprises a milling head body, wherein the milling head body comprises a milling head part and a connecting part, wherein a YD hard alloy welding cladding is welded on the milling head part, a plurality of vertical grooves of even quantity are uniformly formed in the milling head part, milling teeth are welded in the grooves, a plurality of PDC (polycrystalline diamond) compound sheets are respectively welded on the outer side surface and the upper end face of each milling tooth, a support plate is welded on the inner wall of each milling tooth, and a PDC compound sheet and a high-strength hard alloy compound sheet are welded on the support plates, the PDC compound sheets are preferably suitable for milling rock cement sheaths, and the high-strength hard alloy compound sheets are preferably suitable for milling metals. The casing milling head is capable of casing-milling the rocks and the cement sheaths as well as casing-milling the packer and the centering guide outside the pipe, and can complete the operation of extracting a casting of the broken well of a deep well casing by only descending the well once.
Description
Technical field
The utility model relates to that the oil well deep-well gets that cover uses during operation gets the cover drill bit.
Background technology
The Deep Well Casings broken well is got the cover operation, is exactly the damaged sleeve pipe more than the casing-broken fracture is taken out.When getting cover, at first connect broken well cover special milling head with milling pipe, outer cement sheath, the rock of sleeve pipe and be fixed on the outer centralizer cover of pipe mill off in the cement, be incorporated into lower fracture smoothly in the sleeve pipe, then damaged sleeve pipe is taken out, last again sleeve pipe and lower sleeve pipe docking below the fracture.
At present the broken well cover special milling head that uses of Daqing oil field has two kinds: a kind of is that the composite sheet of cutting teeth welding-on PDC composite sheet is got the cover drill bit, can collect the fish head when cover is got in workover treatment, can milling outside tube water mud ring and rock, and can not the outer centralizer of milling pipe; Another kind is the loudspeaker muzzle milling head that cutting teeth is formed by the built-up welding of YD carbide electrode, and it can only spasm fish head, can not milling outside tube water mud ring and rock, and can not the outer centralizer of milling pipe.Should the milling rock in the cover operation because get at deep-well, cement sheath, (centralizer is that spring steel is made for milling external packer of pipe and centralizer again, regular being blended in the cement sheath), so these two kinds of instruments all can't once solve the difficult problem that deep-well is got cover at present.
Summary of the invention
The purpose of this utility model provides a kind of broken well cover special milling head, solved present cover milling head can only spasm fish head and cover mill rock, cement sheath, but can not the milling pipe external packer, the problem of centralizer.
For achieving the above object, the technical solution of the utility model is: broken well cover special milling head, comprise the milling head body, the milling head body is comprised of the connecting portion of cutting head and connection tubing string, wherein milling head body coupling part is three sections, the drilling rod button is set in its hypomere, is provided with axial bar hole on its stage casing sidewall, its epimere internal diameter is greater than its stage casing internal diameter; The cutting head of described milling head body is welded with the YD weld-deposited cladding, be evenly equipped with the vertical groove of even number on the cutting head, welding cutting teeth in the groove, the width of cutting teeth and highly respectively greater than the width of groove and height, there are some PDC composite sheet the lateral surface of cutting teeth and upper surface respectively welding-on; This cover milling head also comprises the supporting plate that doubles vertical groove number, each supporting plate is end to end to be welded on the surface between cutting teeth and the body connecting portion epimere with the YD carbide electrode, supporting plate below each cutting teeth from top to bottom welding-on has hard metal tip, wherein uppermost hard metal tip is the PDC composite sheet, and following is the high strength cemented carbide composite sheet.
The quantity of preferred above-mentioned vertical groove is 8.
Beneficial effect: cover milling head of the present utility model, adopt the compound disk of PDC and high strength cemented carbide composite sheet welding-on on the different lands of each cutting teeth, wherein the PDC composite sheet is the optimal material of rock cutting cement sheath, the high strength cemented carbide composite sheet is the optimal material of cutting metal, two kinds of composite sheet are given full play to optimized cutting performance separately, make cover milling head of the present utility model have the cutting function of combined type, can overlap and mill rock, cement sheath, can overlap again and mill external casing packer, centralizer, the function that also has spasm fish head, only need go into the well and once just can finish the Deep Well Casings broken well and get the cover operation, efficiently solve deep-well and get a difficult problem of overlapping operation.
Description of drawings
Fig. 1 is structural representation of the present utility model.
Fig. 2 is the top view of Fig. 1.
Fig. 3 is the structural representation of milling head body.
Fig. 4 is the lateral view of Fig. 3.
Fig. 5 is the structural representation of cutting teeth and supporting plate.
The specific embodiment
Below in conjunction with accompanying drawing the utility model is further described:
By Fig. 1 in conjunction with shown in Figure 2: broken well cover special milling head, comprise milling head body 1, its structure is as shown in Figures 3 and 4: milling head body 1 is comprised of cutting head 12 and the connecting portion 15 that connects tubing string, wherein body connecting portion 15 is divided into three sections, drilling rod button 16 is set in its hypomere, be provided with axial bar hole 14 on its stage casing sidewall, this bar hole 14 is the water channel of cover milling head, and its epimere 13 internal diameters are greater than its stage casing internal diameter; The cutting head 12 of described milling head body 1 is welded with YD weld-deposited cladding (this overlay cladding is not shown in the drawings), is evenly equipped with the vertical groove 11 of even number on the cutting head 12, better performances when vertical groove 11 quantity of the applicant's design are 8.Groove 11 interior welding cutting teeths 4, the width of cutting teeth 4 and highly respectively greater than the width of groove 11 and height, there are some PDC composite sheet 5 lateral surface of cutting teeth 4 and upper surface respectively welding-on; This cover milling head also comprises the supporting plate 2 that doubles vertical groove 11 quantity, by Fig. 2 in conjunction with shown in Figure 5: each supporting plate 2 is end to end to be welded on the surface between cutting teeth 4 and the body connecting portion epimere 13 with the YD carbide electrode, supporting plate below each cutting teeth from top to bottom welding-on has hard metal tip, wherein uppermost hard metal tip is PDC composite sheet 5, following is high strength cemented carbide composite sheet 3, this high strength cemented carbide composite sheet 3 is available from Zi Gong, Mudanjiang carbide alloy Co., Ltd, and model is PTQ02-13.5-P.
The PDC composite sheet 5 that above-mentioned cutting teeth upper surface and lateral surface are inlayed, mainly bear the task of cutting rock of borehole, the PDC composite sheet 5 of inlaying on the supporting plate and high strength cemented carbide composite sheet 3 are mainly born the task of cutting cement sheath and external casing packer and centralizer.
Claims (2)
1. broken well cover special milling head, comprise the milling head body, the milling head body is comprised of the connecting portion of cutting head and connection tubing string, it is characterized in that: described milling head body coupling part is three sections, the drilling rod button is set in its hypomere, be provided with axial bar hole on its stage casing sidewall, its epimere internal diameter is greater than its stage casing internal diameter; The cutting head of described milling head body is welded with the YD weld-deposited cladding, be evenly equipped with the vertical groove of even number on the cutting head, welding cutting teeth in the groove, the width of cutting teeth and highly respectively greater than the width of groove and height, there are some PDC composite sheet the lateral surface of cutting teeth and upper surface respectively welding-on; This cover milling head also comprises the supporting plate that doubles vertical groove number, each supporting plate is end to end to be welded on the surface between cutting teeth and the body connecting portion epimere with the YD carbide electrode, supporting plate below each cutting teeth from top to bottom welding-on has hard metal tip, wherein uppermost hard metal tip is the PDC composite sheet, and following is the high strength cemented carbide composite sheet.
2. broken well cover special milling head according to claim 1, it is characterized in that: the quantity of described vertical groove is 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220639823 CN202900116U (en) | 2012-11-28 | 2012-11-28 | Special casing milling head for broken well |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220639823 CN202900116U (en) | 2012-11-28 | 2012-11-28 | Special casing milling head for broken well |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202900116U true CN202900116U (en) | 2013-04-24 |
Family
ID=48120799
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220639823 Expired - Lifetime CN202900116U (en) | 2012-11-28 | 2012-11-28 | Special casing milling head for broken well |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202900116U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103643915A (en) * | 2013-12-03 | 2014-03-19 | 中国石油天然气股份有限公司 | Composite casing cutter head for well repair in oil field |
| CN106460467A (en) * | 2014-06-05 | 2017-02-22 | 史密斯国际有限公司 | Polycrystalline diamond cutting element and bit body assemblies |
| CN107587854A (en) * | 2017-08-09 | 2018-01-16 | 胜利油田华滨实业有限公司石油机械滨州分公司 | Horizontal well change casing technique |
| CN111502583A (en) * | 2020-05-20 | 2020-08-07 | 中国石油集团渤海钻探工程有限公司 | Special milling shoe for milling large-diameter surface layer sleeve |
-
2012
- 2012-11-28 CN CN 201220639823 patent/CN202900116U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103643915A (en) * | 2013-12-03 | 2014-03-19 | 中国石油天然气股份有限公司 | Composite casing cutter head for well repair in oil field |
| CN106460467A (en) * | 2014-06-05 | 2017-02-22 | 史密斯国际有限公司 | Polycrystalline diamond cutting element and bit body assemblies |
| CN107587854A (en) * | 2017-08-09 | 2018-01-16 | 胜利油田华滨实业有限公司石油机械滨州分公司 | Horizontal well change casing technique |
| CN107587854B (en) * | 2017-08-09 | 2020-01-14 | 胜利油田华滨实业有限公司井下作业维修分公司 | Horizontal well casing pipe replacing process |
| CN111502583A (en) * | 2020-05-20 | 2020-08-07 | 中国石油集团渤海钻探工程有限公司 | Special milling shoe for milling large-diameter surface layer sleeve |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130424 |