CN105089535A - Self-centering rotating cutting tool - Google Patents
Self-centering rotating cutting tool Download PDFInfo
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- CN105089535A CN105089535A CN201510388144.3A CN201510388144A CN105089535A CN 105089535 A CN105089535 A CN 105089535A CN 201510388144 A CN201510388144 A CN 201510388144A CN 105089535 A CN105089535 A CN 105089535A
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- mandrel
- housing
- cavity
- handle
- cutting tool
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Abstract
The invention relates to a self-centering rotating cutting tool, which is characterized by comprising an upper joint, a first casing and a second casing, wherein the upper joint, the first casing and the second casing are all in hollow structures and form a combined cavity; the right end of the second casing is provided with a plug; three cutter handle grooves are symmetrically formed in the outer wall of the second casing; a retractable cutter handle is arranged in each cutter handle groove; the self-centering rotating cutting tool also comprises a mandrel; the mandrel is arranged in the combined cavity in an inserted way; a resetting ring is fixed on the mandrel; a first cavity is formed between the resetting ring and the second casing; a first flow guide hole and a second flow guide hole are formed in the mandrel; the first flow guide hole and the first cavity are communicated; and a second cavity is also formed between the mandrel and the plug. The self-centering rotating cutting tool has the beneficial effects that a cutting cutter can maintain the centering state; the oil pipe deviating cutting risk is reduced; and a protection effect is achieved on an outer layer oil/casing pipe.
Description
Technical field
The present invention relates to oil field equipment field, particularly relate to a kind of from rotary cutting tool placed in the middle.
Background technology
In existing field produces, cutting tool is all connected with oil pipe, drilling rod and uses, and relies on the rotation of oil pipe, drilling rod to drive cutting tool to rotate, realizes the cutting of oil, sleeve pipe.Owing to being subject to the restriction of oil pipe, drilling rod size, cutting tool cannot realize the cutting of minor diameter tubing.On the other hand due to oil pipe, run of steel restriction, cutting tool lowering velocity is slow, and cutting efficiency is lower.
Along with the development of underground work new technology of preparing, tubing string down-hole meet card cannot unfreezing situation get more and more, meet card position and usually concentrate on horizontal segment, the internal diameter of meeting card tubing string is on the other hand also more and more less, oil pipe, drilling rod cannot be utilized to connect cutting tool and cut.Existing Conventional solutions takes the cutting mode such as chemistry, explosion end-on card tubing string to carry out cutting unfreezing, is easy to the damage causing outer oil, sleeve pipe like this, affects the oil in later stage, the continuous seepage of gas well.
Summary of the invention
The present invention is directed to the deficiency that prior art exists, provide a kind of compact, easy to usely can available protecting outer oil, sleeve pipe cut inclined to rotary cutting tool placed in the middle.
The technical scheme that the present invention solves the problems of the technologies described above is as follows: a kind of from rotary cutting tool placed in the middle, it is characterized in that, comprise the top connection all in hollow-core construction, the first housing and the second housing, described top connection and the second housing are connected to the right-hand member of described first housing and left end and form combined cavity, the right-hand member of described second housing is provided with plug, be arranged with three handle of a knife grooves at the outer wall of described second housing, being provided with in each described handle of a knife groove can folding and unfolding handle of a knife; Also comprise the mandrel in hollow-core construction, described mandrel is slidably inserted in described combined cavity, on described mandrel, fixed cover is equipped with reset ring, described reset ring can slide at the inner wall sealing of the first housing, the first cavity is formed between the right-hand member of described reset ring and the left end of the second housing, described mandrel is provided with the first pod apertures and the second pod apertures, and described first pod apertures is connected with described first cavity, the ft connection of described second pod apertures and described second housing.Between the left end and described top connection right-hand member of described reset ring, form spring cavity, in described spring cavity, be provided with back-moving spring.
The invention has the beneficial effects as follows: by being arranged with three handle of a knife grooves at the outer wall of described second housing, and be provided with in each described handle of a knife groove can folding and unfolding handle of a knife; Form one after three handle of a knifes are opened under mandrel effect to hold round, serve the effect of centralizer, cutting tool can be supported placed in the middle in oil, sleeve pipe, reduce and cut inclined risk, outer oil, sleeve pipe are played a protective role.
On the basis of technique scheme, the present invention can also do following improvement.
Further, the right-hand member diameter of described mandrel is greater than left end diameter, forms arc necking down in described handle of a knife groove location, described arc necking down and described handle of a knife suitable.
The beneficial effect of above-mentioned further scheme is adopted to be that, when mandrel is moved to the left, ensure under the effect of arc necking down, make three handle of a knifes synchronously actuate, arc necking down plays symmetric support effect to handle of a knife.
Further, between described mandrel right-hand member and described plug left end, the second cavity is also provided with.
Adopting the beneficial effect of above-mentioned further scheme to be possessed the effect of twin-stage fluid cylinder, also by changing inner sealing form, single-stage fluid cylinder can be become from twin-stage fluid cylinder.
Further, the right-hand member of described mandrel is also provided with gas pressure relief slot, and when mandrel moves to high order end, described gas pressure relief slot makes the ft connection of the inside of mandrel and described second housing.
The beneficial effect of above-mentioned further scheme is adopted to be that, when mandrel moves to right-hand member, this gas pressure relief slot is enclosed on the wall of described second housing; When mandrel moves to left end, this gas pressure relief slot makes combined cavity and turned on outside, thus makes the rapid pressure release of hydraulic pressure in combination cavity, and this Pressure Fluctuation Signal is transmitted to aboveground hydraulic system by pipeline, thus learns that handle of a knife opens up into maximum magnitude.
Further, be provided with bearing pin in described handle of a knife groove, described handle of a knife is hinged by described bearing pin and described second housing.
The beneficial effect of above-mentioned further scheme is adopted to be handle of a knife is changed simple, quick, rotate flexibly.
Further, the limiting stand for limiting described handle of a knife maximum opening is provided with in described handle of a knife groove.
The beneficial effect of above-mentioned further scheme is adopted to be ensure at handle of a knife to maximum opening time limit allocation.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is the structural representation of mandrel;
Fig. 3 is working state figure of the present invention:
Fig. 4 is that the A-A of the middle mandrel of Fig. 3 is to generalized section.
In Fig. 1 to Fig. 4,1, top connection; 2, the first housing; 3, back-moving spring; 4, reset ring; 5, pin; 6, the second housing; 6-1, handle of a knife groove; 7, bearing pin; 8, handle of a knife; 9, mandrel; 9-1, the first pod apertures; 9-2, the second pod apertures; 9-3, gas pressure relief slot; 9-4, arc necking down; 10, plug; 11, the first cavity; 12, the second cavity.
Detailed description of the invention
Be described principle of the present invention and feature below in conjunction with accompanying drawing, example, only for explaining the present invention, is not intended to limit scope of the present invention.
As shown in Figures 1 to 4, a kind of from rotary cutting tool placed in the middle, comprise top connection 1, first housing 2 all in hollow-core construction and the second housing 6, described top connection 1 and the second housing 6 are connected to the right-hand member of described first housing 2 and left end and form combined cavity, the right-hand member of described second housing 6 is provided with plug 10, be arranged with three handle of a knife groove 6-1 at the outer wall of described second housing 6, being provided with in each described handle of a knife groove can folding and unfolding handle of a knife 8; Also comprise the mandrel 9 in hollow-core construction, described mandrel 9 is slidably inserted in described combined cavity, on described mandrel 9, fixed cover is equipped with reset ring 4, described reset ring can slide at the inner wall sealing of the first housing 2, the first cavity 11 is formed between the right-hand member of described reset ring and the left end of the second housing 6, described mandrel 9 is provided with the first pod apertures 9-1 and the second pod apertures 9-2, and described first pod apertures is connected with described first cavity, the ft connection of described second pod apertures and described second housing 6.Between the left end and described top connection right-hand member of described reset ring, form spring cavity, in described spring cavity, be provided with back-moving spring 3.Described reset ring 4 is fixed by pin 5 and described mandrel 9.
The right-hand member diameter of described mandrel is greater than left end diameter, forms arc necking down at described handle of a knife groove 6-1 position, described arc necking down 9-4 and described handle of a knife 8 suitable.
The second cavity 12 is also provided with between described mandrel 9 right-hand member and described plug 10 left end.
The right-hand member of described mandrel is also provided with gas pressure relief slot 9-3, and when mandrel 9 moves to high order end, described gas pressure relief slot 9-3 makes the ft connection of the inside of mandrel and described second housing 6.
Be provided with bearing pin 7 in described handle of a knife groove, described handle of a knife 8 is hinged with described second housing 6 by described bearing pin 7.
The limiting stand for limiting described handle of a knife maximum opening is provided with in described handle of a knife groove 6-1.
Operating principle of the present invention is as follows:
Described from rotary cutting tool placed in the middle need collocation helicoid hydraulic motor use.Helicoid hydraulic motor is connected with the present invention by top connection 1, and after transferring to from rotary cutting tool string placed in the middle and needing cutting position, by ground pumping liquid, helicoid hydraulic motor rotates under the effect of Hydraulic pump, thus drive is rotated from rotary cutting tool placed in the middle.Because the right-hand member of the second housing 6 is provided with plug 10, plug 10 plays sealing function.Liquid is by after the centre bore of mandrel 9, and a part of liquid enters into the first cavity 11, and another part enters into the second cavity 12, and Part III flows to tool exterior by the second pod apertures 9-2.After the second pod apertures 9-2, produce pressure differential according to bernoulli principle liquid stream, namely there is a hydraulic pressure in the two ends of the second pod apertures 9-2.Due to the first pod apertures 9-1 and the first cavity 11 together with, after being full of liquid in the first cavity 11, the first pod apertures 9-1 two ends are without pressure differential, and the pressure namely in the first cavity 11 is equal with the pressure of mandrel 9 centre bore.According to fluid pressure characteristic (ignoring the frictional dissipation between the first pod apertures 9-1 and the second pod apertures 9-2), the centre bore each point place pressure of mandrel 9 is equal, and the pressure namely in the first cavity 11 is equal with the pressure in the second cavity in 12.
Fluid pressure in first cavity 11 acts on the cross section, right side of reset ring 4, forms first order fluid cylinder.Fluid pressure in second cavity 12 acts on its right end face of mandrel 9, forms second level fluid cylinder.Because mandrel 9 freely can slide axially in the combined cavity of top connection 1 and the second housing 6, therefore under the effect of twin-stage fluid cylinder, promote mandrel 9 be moved to the left trend, when mandrel 9 is moved to the left, Compress Spring 3 is compressed, produce a compression force on the left surface of reset ring 4, when the power left that mandrel 9 is subject to is greater than the spring force of Compress Spring 3 generation, mandrel 9 is moved to the left, until mandrel 9 moves to extreme position.When mandrel 9 power be subject to left is less than the spring force of back-moving spring 3 generation, mandrel just moves right, until mandrel right-hand member contacts with plug 10.
The size of the power that mandrel 9 is subject to left depends primarily on the pressure in the first cavity 11 and the second cavity 12.By changing from rotary cutting tool structure placed in the middle, only can form single-stage fluid cylinder and promoting mandrel 9 to left movement.Because mandrel 9 right-hand member diameter is greater than left end, after mandrel 9 is moved to the left, the necking down right-hand member of mandrel 9 contacts with handle of a knife 8, and forces handle of a knife 8 to open laterally around bearing pin 7, and 3 handle of a knifes 8 outwards open simultaneously.
Progressively increase the liquid displacement flowing through mandrel 9, the pressure differential that liquid stream produces through the second pod apertures 9-2 just increases thereupon, pressure in first cavity 11 and the second cavity 12 also increases simultaneously, the power that mandrel 9 is subject to left under the effect of twin-stage fluid cylinder constantly increases, overcome the compressive force that back-moving spring 3 produces, the scope that handle of a knife 8 opens increases gradually, and after mandrel 9 is moved to the left to maximum displacement, the angle that handle of a knife 8 opens reaches maximum.Because there is arc necking down 9-4 the second housing 6 inside, the diameter of mandrel 9 right-hand member is greater than necking down, and mandrel 9 just stops being moved to the left, if now increase discharge capacity again, mandrel 9 also can not be moved to the left.On the other hand after mandrel 9 arrives high order end position, mandrel 9 right side has gas pressure relief slot 9-3 just expose, with from rotary cutting tool ft connection placed in the middle, add liquid stream flow pass after mandrel 9, when liquid displacement is constant, the pressure differential now flowing through the second pod apertures 9-2 generation just reduces, and system pressure just reduces, and points out to operator one.This gas pressure relief slot can be communicated with along mandrel exterior with the second cavity 12, also can radially be communicated with the endoporus of mandrel.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. one kind from rotary cutting tool placed in the middle, it is characterized in that, comprise the top connection all in hollow-core construction, the first housing and the second housing, described top connection and the second housing are connected to the right-hand member of described first housing and left end and form combined cavity, the right-hand member of described second housing is provided with plug, be arranged with three handle of a knife grooves at the outer wall of described second housing, being provided with in each described handle of a knife groove can folding and unfolding handle of a knife; Also comprise the mandrel in hollow-core construction, described mandrel is slidably inserted in described combined cavity, on described mandrel, fixed cover is equipped with reset ring, described reset ring can slide at the inner wall sealing of the first housing, the first cavity is formed between the right-hand member of described reset ring and the left end of the second housing, described mandrel is provided with the first pod apertures and the second pod apertures, and described first pod apertures is connected with described first cavity, the ft connection of described second pod apertures and described second housing; Between the left end and described top connection right-hand member of described reset ring, form spring cavity, in described spring cavity, be provided with back-moving spring.
2. according to claim 1ly it is characterized in that from rotary cutting tool placed in the middle, the right-hand member diameter of described mandrel is greater than left end diameter, forms arc necking down in described handle of a knife groove location, described arc necking down and described handle of a knife suitable.
3. according to claim 1ly to it is characterized in that from rotary cutting tool placed in the middle, between described mandrel right-hand member and described plug left end, be also provided with the second cavity.
4. according to any one of claims 1 to 3 from rotary cutting tool placed in the middle, it is characterized in that, the right-hand member of described mandrel is also provided with gas pressure relief slot, and when mandrel moves to high order end, described gas pressure relief slot makes the ft connection of the inside of mandrel and described second housing.
5. according to any one of claims 1 to 3 from rotary cutting tool placed in the middle, it is characterized in that, be provided with bearing pin in described handle of a knife groove, described handle of a knife is hinged by described bearing pin and described second housing.
6. according to any one of claims 1 to 3 from rotary cutting tool placed in the middle, it is characterized in that, in described handle of a knife groove, being provided with the limiting stand for limiting described handle of a knife maximum opening.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510388144.3A CN105089535B (en) | 2015-07-03 | 2015-07-03 | It is a kind of from rotary cutting tool placed in the middle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510388144.3A CN105089535B (en) | 2015-07-03 | 2015-07-03 | It is a kind of from rotary cutting tool placed in the middle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105089535A true CN105089535A (en) | 2015-11-25 |
| CN105089535B CN105089535B (en) | 2017-10-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510388144.3A Active CN105089535B (en) | 2015-07-03 | 2015-07-03 | It is a kind of from rotary cutting tool placed in the middle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113319935A (en) * | 2021-05-24 | 2021-08-31 | 中国地质大学（北京） | Simple mechanical internal cutting knife |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5732770A (en) * | 1996-08-02 | 1998-03-31 | Weatherford/Lamb, Inc. | Wellbore cutter |
| US5791409A (en) * | 1996-09-09 | 1998-08-11 | Baker Hughes Incorporated | Hydro-mechanical multi-string cutter |
| GB2352747A (en) * | 1999-07-27 | 2001-02-07 | Baker Hughes Inc | Reusable cutting and milling tool |
| CN203685093U (en) * | 2013-12-31 | 2014-07-02 | 中国石油集团渤海钻探工程有限公司 | Downhole bushing end mill |
| CN204754841U (en) * | 2015-07-03 | 2015-11-11 | 杰瑞能源服务有限公司 | From cutting means placed in middle rotatory |
-
2015
- 2015-07-03 CN CN201510388144.3A patent/CN105089535B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5732770A (en) * | 1996-08-02 | 1998-03-31 | Weatherford/Lamb, Inc. | Wellbore cutter |
| US5791409A (en) * | 1996-09-09 | 1998-08-11 | Baker Hughes Incorporated | Hydro-mechanical multi-string cutter |
| GB2352747A (en) * | 1999-07-27 | 2001-02-07 | Baker Hughes Inc | Reusable cutting and milling tool |
| CN203685093U (en) * | 2013-12-31 | 2014-07-02 | 中国石油集团渤海钻探工程有限公司 | Downhole bushing end mill |
| CN204754841U (en) * | 2015-07-03 | 2015-11-11 | 杰瑞能源服务有限公司 | From cutting means placed in middle rotatory |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113319935A (en) * | 2021-05-24 | 2021-08-31 | 中国地质大学（北京） | Simple mechanical internal cutting knife |
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| Publication number | Publication date |
|---|---|
| CN105089535B (en) | 2017-10-20 |
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