CN110886586B - Method for improving cutting efficiency of mill shoes and fracture centering mill shoes used by method - Google Patents
Method for improving cutting efficiency of mill shoes and fracture centering mill shoes used by method Download PDFInfo
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- CN110886586B CN110886586B CN201911309917.9A CN201911309917A CN110886586B CN 110886586 B CN110886586 B CN 110886586B CN 201911309917 A CN201911309917 A CN 201911309917A CN 110886586 B CN110886586 B CN 110886586B
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- 238000005520 cutting process Methods 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000003801 milling Methods 0.000 claims abstract description 37
- 239000000956 alloy Substances 0.000 claims abstract description 22
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000000227 grinding Methods 0.000 claims abstract description 10
- 238000005553 drilling Methods 0.000 claims abstract description 6
- 239000004568 cement Substances 0.000 claims abstract description 5
- 238000003466 welding Methods 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 238000005219 brazing Methods 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 239000002131 composite material Substances 0.000 claims description 3
- 239000000110 cooling liquid Substances 0.000 claims description 3
- MOFOBJHOKRNACT-UHFFFAOYSA-N nickel silver Chemical compound [Ni].[Ag] MOFOBJHOKRNACT-UHFFFAOYSA-N 0.000 claims description 3
- 239000010956 nickel silver Substances 0.000 claims description 3
- 230000002035 prolonged effect Effects 0.000 claims description 3
- 241000251468 Actinopterygii Species 0.000 abstract description 5
- 230000001788 irregular Effects 0.000 abstract description 3
- 238000010902 jet-milling Methods 0.000 abstract 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000005507 spraying Methods 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
- E21B29/00—Cutting or destroying pipes, packers, plugs or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground
Landscapes
- 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)
- Earth Drilling (AREA)
- Crushing And Pulverization Processes (AREA)
Abstract
The invention discloses a method for improving the cutting efficiency of a mill shoe and a fracture centering mill shoe used by the method; firstly eliminating cement cakes and oil dirt on the inner wall of the pipe column by utilizing tungsten carbide polygonal prism hard alloy blocks welded on the front end and the middle two blades of the drill bit section, and then milling by using a milling section at the rear end of the drill bit section; thereby improving the cutting efficiency of the grinding shoe. The structure of the jet milling device comprises a body (1), wherein the body (1) is divided into a connecting section (2), a milling section (3), a jet flow section (4) and a drill bit section (5) from left to right; a group of multi-edge hard alloy cutter blocks (9) are arranged at the edges of the two sides of the drill bit section (5). The invention can efficiently treat hard objects in the water hole and repair irregular water holes, can realize the purpose of simultaneously completing water hole feeding and fish head repairing by one trip of drilling, improves the efficiency by 3-5 times, and shortens the operation period.
Description
Technical Field
The invention relates to a method for improving the cutting efficiency of a mill shoe and a fracture centering mill shoe used by the method, belonging to the technical field of well repair tools.
Background
At present, in the oil-water well action process of an oil field, when a damaged fish roof in the well cannot be normally salvaged, a junk fish roof damaged is often ground and milled by a mill shoe so as to salvage the junk, and when a plug surface which cannot be drilled by a common drill bit and a cement fixed-clamping pipe column are used for treating the unknown junk in the well, different milling tools are generally adopted for realizing. Milling tools typically include flat bottom shoes, concave bottom shoes, multi-bladed shoes, etc., typically the milling teeth of these shoes are composed of the YD cemented carbide or other wear resistant material deposited. The hard alloy particles have no regular rake angles and cutting grooves, so that the use process has low efficiency and long operation time, and the production is influenced.
Disclosure of Invention
The invention aims to provide a method for improving the cutting efficiency of a mill shoe and a fracture centering mill shoe used for improving the cutting efficiency of the mill shoe, thereby overcoming the defects in the prior art.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the invention relates to a method for improving the cutting efficiency of grinding shoes, which is characterized in that a drill bit section is additionally arranged at the front end of a grinding and milling section of a body; firstly eliminating cement cakes and oil dirt on the inner wall of the pipe column by utilizing tungsten carbide polygonal prism hard alloy blocks welded on the front end and the middle two blades of the drill bit section, and then milling by using a milling section at the rear end of the drill bit section; thereby improving the cutting efficiency of the grinding shoe.
In the method for improving the cutting efficiency of the grinding shoe, the tungsten carbide polygonal prism hard alloy block is a blade with a rake angle and a cutting groove.
In the method for improving the cutting efficiency of the grinding shoe, the tungsten carbide polygonal prism hard alloy block adopts a tungsten carbide composite welding rod with the diameter of 3.2-4.8 mm and is matched with high-strength nickel-silver based brazing material with coating for welding.
In the method for improving the cutting efficiency of the mill shoes, the rear end of the drill bit section is provided with a jet flow section; the jet hole on the jet section is positioned between the two blades of the drill section, and the drill section is cooled by jetting cooling liquid, so that the service life of the drill is prolonged.
The fracture centering milling shoe comprises a body, wherein the body is divided into a connecting section, a milling section, a jet section and a drill bit section from left to right; the front end of the drill bit section is in a conical flat plate shape, and a group of multi-edge hard alloy cutter blocks are arranged at the edges of two sides of the conical flat plate; the rear section of the drill bit section is of a double-blade structure, and a cooling channel is formed between the two blades.
In the fracture centering milling shoe, the jet flow section is a cylinder, a blind hole is formed in the center of the jet flow section, a pair of jet holes uniformly distributed along the circumference are formed in the periphery of the blind hole, and one end of each jet hole is communicated with the blind hole; the outlet at the other end of the jet hole is positioned between two blades of the drill bit section.
In the fracture centering milling shoe, the cross section of the milling section is in a cross wing shape, a group of multi-edge hard alloy cutter blocks are arranged on the same side of each cutter wing of the cross wing, and a water hole is formed in the center of the milling section; the water hole is communicated with the blind hole of the jet section.
In the fracture centering milling shoe, the outer circle of the connecting section is a reducing cylinder, and the thicker diameter end of the connecting section is connected with the milling section into a whole; the center of the connecting section is provided with a water hole, and an orifice at one end with a smaller diameter of the connecting section is provided with a connecting thread for connecting a drilling tool.
In the fracture centering milling shoe, a group of multi-edge hard alloy cutter blocks on each blade of the milling section are orderly arranged in a row and column mode; the tungsten carbide polygonal prism hard alloy block is provided with a cutting groove and a cutting rake angle.
Due to the adoption of the technical scheme, compared with the prior art, the invention can efficiently treat hard objects in the water hole and repair irregular water holes, can realize the purpose of completing water hole feeding and fish head repairing at the same time of one trip of drilling, improves the efficiency by 3-5 times, and shortens the operation period.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a front view of FIG. 1;
FIG. 3 is a schematic cross-sectional view of A-A in FIG. 2;
FIG. 4 is a schematic view in cross-section B-B of FIG. 2;
FIG. 5 is a schematic view in cross-section C-C of FIG. 2;
fig. 6 is a view in the direction D in fig. 1.
The marks in the drawings are: 1-body, 2-connecting section, 3-milling section, 4-jet section, 5-drill section, 6-water hole, 7-connecting screw thread, 8-blade, 9-polygonal cemented carbide cutter block, 10-blind hole, 11-jet hole, 12-conical flat plate and 13-cooling channel.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples.
The invention relates to a method for improving the cutting efficiency of grinding shoes, as shown in fig. 1 and 2, which is characterized in that a drill bit section 5 is additionally arranged at the front end of a grinding section 3 of a body 1; the method comprises the steps of firstly eliminating cement cakes and oil dirt on the inner wall of a pipe column by using tungsten carbide polygonal prism hard alloy cutter blocks 9 welded on the front end and the middle two blades of a drill bit section 5, and then milling by using a milling section 3 at the rear end of the drill bit section 5; thereby improving the cutting efficiency of the grinding shoe. The tungsten carbide polygonal cemented carbide insert 9 is an insert with rake angles and cutting flutes. The tungsten carbide polygonal prism hard alloy cutter block 9 adopts a tungsten carbide composite welding rod with the diameter of 3.2-4.8 mm, and is matched with high-strength nickel-silver based brazing material with coating for welding. The rear end of the drill bit section 5 is provided with a jet flow section 4; jet holes 11 on the jet section 4 are positioned between two blades of the drill bit section 5, and the drill bit section 5 is cooled by spraying cooling liquid, so that the service life of the drill bit is prolonged.
The fracture centering milling shoe of the invention constructed according to and used in the above method, as shown in fig. 1 to 6, comprises a body 1, the body 1 being divided from left to right into a connecting section 2, a milling section 3, a jet section 4 and a drill bit section 5; the front end of the drill bit section 5 is in the shape of a conical flat plate 12 as shown in fig. 2 and 5, and a group of polygonal cemented carbide cutter blocks 9 are arranged at the edges of two sides of the conical flat plate 12; the rear section of the drill bit section 5 is shown in fig. 4 as a double blade structure, and a cooling channel 13 is formed between the two blades. The jet section 4 is a cylinder, a blind hole 10 is arranged in the center of the jet section 4, a pair of jet holes 11 uniformly distributed along the circumference are arranged around the blind hole 10, and one end of each jet hole 11 is communicated with the blind hole 10; the outlet of the other end of the jet hole 11 is positioned between two blades of the drill bit section 5. The cross section of the milling section 3 is in a cross wing shape as shown in fig. 3, a group of multi-edge hard alloy cutter blocks 9 are arranged on the same side of each cutter wing 8 of the cross wing, and a water hole 6 is arranged in the center of the milling section 3; the water hole 6 is communicated with the blind hole 10 of the jet section 4. The outer circle of the connecting section 2 is a reducing cylinder, wherein the thicker diameter end is connected with the milling section 3 into a whole; the center of the connecting section 2 is provided with a water hole 6, and the orifice of the thinner end of the connecting section 2 is provided with a connecting thread 7 for connecting a drilling tool. A group of multi-edge hard alloy cutter blocks 9 on each cutter blade 8 of the milling section 3 are orderly arranged in a row and column mode; the tungsten carbide polygonal prism hard alloy block is provided with a cutting groove and a cutting rake angle.
The invention can efficiently treat hard objects in the water hole and repair irregular water holes, can realize the purpose of simultaneously completing water hole feeding and fish head repairing by one trip of drilling, improves the efficiency by 3-5 times, and shortens the operation period.
Claims (6)
1. A method for improving the cutting efficiency of a mill shoe, comprising the steps of: the method is that a drill bit section is additionally arranged at the front end of a milling section of a body; firstly eliminating cement cakes and oil dirt on the inner wall of the pipe column by utilizing tungsten carbide polygonal prism hard alloy blocks welded on the front end and the middle two blades of the drill bit section, and then milling by using a milling section at the rear end of the drill bit section; thereby improving the cutting efficiency of the grinding shoe; the rear end of the drill bit section is provided with a jet flow section; the jet hole on the jet section is positioned between the two blades of the drill bit section, and the drill bit section is cooled by jetting cooling liquid, so that the service life of the drill bit is prolonged;
fracture centering milling shoe for said method, comprising a body (1), characterized in that: the body (1) is divided into a connecting section (2), a milling section (3), a jet flow section (4) and a drill bit section (5) from left to right; the front end of the drill bit section (5) is in a shape of a conical flat plate (12), and a group of polygonal hard alloy cutter blocks (9) are arranged at the edges of two sides of the conical flat plate (12); the section of the rear section of the drill bit section (5) is of a double-blade structure, and a cooling channel (13) is formed between the two blades;
the jet flow section (4) is a cylinder, a blind hole (10) is formed in the center of the jet flow section (4), a pair of jet holes (11) which are uniformly distributed along the circumference are formed in the periphery of the blind hole (10), and one end of each jet hole (11) is communicated with the blind hole (10); the outlet at the other end of the jet hole (11) is positioned between two blades of the drill bit section (5).
2. A method of improving the cutting efficiency of a mill shoe according to claim 1, wherein: the tungsten carbide polygonal prism hard alloy block is a blade with a rake angle and a cutting groove.
3. A method of improving the cutting efficiency of a mill shoe according to claim 1, wherein: the tungsten carbide polygonal prism hard alloy block adopts a tungsten carbide composite welding rod with the diameter of 3.2-4.8 mm, and is matched with high-strength nickel-silver based brazing material with coating for welding.
4. A method of improving the cutting efficiency of a mill shoe according to claim 1, wherein: the cross section of the milling section (3) is in a cross wing shape, a group of multi-edge hard alloy cutter blocks (9) are arranged on the same side of each cutter wing (8) of the cross wing, and a water hole (6) is formed in the center of the milling section (3); the water hole (6) is communicated with a blind hole (10) of the jet section (4).
5. A method of improving the cutting efficiency of a mill shoe according to claim 1, wherein: the outer circle of the connecting section (2) is a reducing cylinder, and one end with a thicker diameter is connected with the milling section (3) into a whole; the center of the connecting section (2) is provided with a water hole (6), and an orifice at the end with the smaller diameter of the connecting section (2) is provided with a connecting thread (7) for connecting a drilling tool.
6. The method for improving the cutting efficiency of a mill shoe according to claim 4, wherein: a group of multi-edge hard alloy cutter blocks (9) on each cutter wing (8) of the milling section (3) are orderly arranged in a row and column mode; the tungsten carbide polygonal prism hard alloy block is provided with a cutting groove and a cutting rake angle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911309917.9A CN110886586B (en) | 2019-12-18 | 2019-12-18 | Method for improving cutting efficiency of mill shoes and fracture centering mill shoes used by method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911309917.9A CN110886586B (en) | 2019-12-18 | 2019-12-18 | Method for improving cutting efficiency of mill shoes and fracture centering mill shoes used by method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110886586A CN110886586A (en) | 2020-03-17 |
| CN110886586B true CN110886586B (en) | 2023-12-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911309917.9A Active CN110886586B (en) | 2019-12-18 | 2019-12-18 | Method for improving cutting efficiency of mill shoes and fracture centering mill shoes used by method |
Country Status (1)
| Country | Link |
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| CN (1) | CN110886586B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112031692A (en) * | 2020-09-14 | 2020-12-04 | 北京博德世达石油技术股份有限公司 | External positioning milling composite milling shoe, and oil drilling equipment and method adopting same |
| CN113404456B (en) * | 2021-07-30 | 2023-02-28 | 中国石油化工股份有限公司 | Process method suitable for drilling soluble bridge plug for shale gas well |
| CN115958227B (en) * | 2022-12-24 | 2024-04-16 | 贵州高峰石油机械股份有限公司 | Multistage flexible shaper |
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