CN204691679U - The anti-backing pressure device of a kind of drilling tool for directional well - Google Patents
The anti-backing pressure device of a kind of drilling tool for directional well Download PDFInfo
- Publication number
- CN204691679U CN204691679U CN201520416341.7U CN201520416341U CN204691679U CN 204691679 U CN204691679 U CN 204691679U CN 201520416341 U CN201520416341 U CN 201520416341U CN 204691679 U CN204691679 U CN 204691679U
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- Prior art keywords
- mandrel
- core sleeve
- impeller
- drilling tool
- directional well
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000005553 drilling Methods 0.000 title claims abstract description 45
- 239000002002 slurry Substances 0.000 claims abstract description 35
- 230000036961 partial effect Effects 0.000 claims abstract description 5
- 230000000670 limiting effect Effects 0.000 claims description 13
- 238000011144 upstream manufacturing Methods 0.000 claims description 11
- 238000005461 lubrication Methods 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 27
- 230000010355 oscillation Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 12
- 239000012530 fluid Substances 0.000 description 7
- 239000002184 metal Substances 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 238000009434 installation Methods 0.000 description 4
- 125000004122 cyclic group Chemical group 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000033001 locomotion Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000009527 percussion Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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- Earth Drilling (AREA)
Abstract
The utility model provides the anti-backing pressure device of a kind of drilling tool for directional well, comprising: mandrel, and described mandrel is the cavity being provided with through hole; Core sleeve, described core sleeve is socketed in the outside of described mandrel in the mode that can move axially; High-pressure slurry flows through the inner chamber of described core sleeve, and flows through the inner chamber of described mandrel; The arrival end of described mandrel is provided with the piston that dams, described in the piston that dams can the partial pressure of high-pressure slurry be transferred on described mandrel, guarantee that high-pressure slurry flowing is unimpeded simultaneously; Impeller, described impeller is arranged in described mandrel, and the rotating shaft of described impeller is perpendicular to the axis direction of described mandrel, and high-pressure slurry orders about described wheel rotation.The anti-backing pressure device of drilling tool for directional well of the present utility model, impeller is set in the circulation passage of high-pressure slurry and the piston that dams, makes mandrel produce axial impulse oscillation, reduce the friction between drilling tool and the borehole wall, solve backing pressure problem, improve drilling well effect.
Description
Technical field
The utility model relates to oil-well drilling equipment technical field, particularly relates to the anti-backing pressure device of a kind of drilling tool for directional well.
Background technology
Along with the progress of oil drilling exploitation cause, increasing directional well, horizontal well technology have applied in petroleum drilling engineering, even adopt cluster well in some areas.Such well bore design is not only drilling well and provides cost savings, and drill bit also can be made to be drilled into desirable target position better more accurately, thus improves efficiency and the output of oil exploitation.But the casing programme of above-mentioned various drilling well also brings larger difficulty to drilling well work, this will ask for help use new equipment new technology to go to solve the problems such as well bore safety problem, directional bearing problem, drill tool wear problem and drill bit backing pressure.
Wherein, drill bit backing pressure problem is comparatively outstanding, also hampers further developing of drilling technology.Drill bit backing pressure problem Producing reason is: in directional well, horizontal well, owing to there is the well bore level trend of long distance, drill bit before drilling tool is lain low to creep in well, wherein most drilling pressure is consumed in and overcomes on the frictional resistance of drilling tool, so ground installation is difficult to apply enough pressure in order to fractured rock to drill bit; Meanwhile, terrestrial operation engineer is even difficult to the accurate pressure understanding drill bit, causes rate of penetration to be very restricted; Further, if strong pressurizing also can bring safely very large hidden danger to well bore in order to solve drill bit backing pressure problem.
Creep into backing pressure problem to solve, drilling engineering both domestic and external have employed and much improves behave.Such as, adopt rational deflecting mode, adopt composite lubricated technology, strengthening well slurry shutoff wall building property etc.Although these measures can alleviate drill bit backing pressure problem to a certain extent, be only the improvement of method, process aspect, instead of equipment, instrument transformation, its anti-backing pressure DeGrain, service condition also has certain limitation.
Utility model content
The purpose of this utility model is to provide a kind of drilling tool for directional well anti-backing pressure device, to solve the drill bit backing pressure problem that drilling tool of the prior art exists in the drilling process of directional well, horizontal well.
To achieve these goals, the utility model is by the following technical solutions:
The anti-backing pressure device of a kind of drilling tool for directional well that the utility model provides, comprising: mandrel, described mandrel is the cavity being provided with through hole; Core sleeve, described core sleeve is socketed in the outside of described mandrel in the mode that can move axially; High-pressure slurry flows through the inner chamber of described core sleeve, and flows through the inner chamber of described mandrel; The arrival end of described mandrel is provided with the piston that dams, described in the piston that dams can the partial pressure of high-pressure slurry be transferred on described mandrel, guarantee that high-pressure slurry flowing is unimpeded simultaneously; Impeller, described impeller is arranged in described mandrel, and the rotating shaft of described impeller is perpendicular to the axis direction of described mandrel, and high-pressure slurry orders about described wheel rotation.
Further, comprise impeller base, described impeller is arranged in impeller base, and described impeller base is arranged in described mandrel.The technique effect of this technical scheme is: the profile of impeller base and the inner chamber of mandrel are worked in coordination, and impeller is arranged on impeller base by rotating shaft, and impeller base is then placed in mandrel.Avoiding impeller is directly installed on mandrel, facilitates dismounting and the maintenance of impeller and impeller base.
Further, comprise the diversion component being arranged on described impeller base upstream, the water conservancy diversion direction of described diversion component is towards described impeller.The technique effect of this technical scheme is: because impeller to be arranged on the inner chamber of mandrel by impeller base, need to arrange the tangential direction of a diversion component by the guiding of high-pressure slurry stream and along blade to flow, make impeller under the percussion of mud, can along the axis of rotation of self; Meanwhile, diversion component makes the circulation area of high-pressure slurry diminish, and impels the flow velocity of high-pressure slurry to increase, enhances the rotating effect of impeller.
Further, comprise elastomeric element, described elastomeric element is used for fixing described diversion component and described impeller base.The technique effect of this technical scheme is: diversion component and impeller base are placed on mandrel inner chamber by removably on the one hand, and elastomeric element leaves larger acceptable scale error to installation diversion component and impeller base; On the other hand, elastomeric element reduces the oscillation fault rate of impeller, impeller base and diversion component.
Further, dam described between piston and described core sleeve and be provided with the first seal.The technique effect of this technical scheme is: the first seal can prevent high-pressure slurry from flowing to toroidal cavity between mandrel and core sleeve, prevents the mutual translational motion of high-pressure slurry to mandrel and core sleeve from producing adverse influence.
Preferably, described first seal comprises back-up ring and O RunddichtringO.The technique effect of this technical scheme is: the effect of O RunddichtringO is the space between the lateral wall of sealed core axle and the inside wall of core sleeve; And the effect of back-up ring is the compression capability and the sealing effectiveness that increase O-ring seals.
Further, between the inside wall of the described core sleeve port of export and the lateral wall of described mandrel, the second seal is provided with; Between described first seal and described second seal, form a toroidal cavity surrounded by described mandrel and described core sleeve, in described toroidal cavity, be provided with lubrication oil.The technique effect of this technical scheme is: first effect of the second seal is to prevent the mud returning annular space from entering gap between mandrel and core sleeve, and second effect is the leakage preventing lubrication oil; The effect of lubrication oil is to reduce the friction between mandrel and core sleeve, the application life of both increases.
Further, between the inside wall of described core sleeve and the lateral wall of described mandrel, also limiting component is provided with; Described limiting component departs from described core sleeve for stoping described mandrel.The technique effect of this technical scheme is: the effect of mandrel is to guide high-pressure slurry to flow to impeller and drill bit on the one hand, be that the mud pressure along with cyclic fluctuation produces axial dither on the other hand, if mandrel have left the scope comprised inside core sleeve, just lose the effect of itself, therefore the normal work that this limiting component can ensure mandrel is set.
Preferably, described limiting component comprises the groove being arranged on described mandrel lateral wall, and two semicircular ring; Two described semicircular ring are fastened in described groove, form the annulus that external diameter is greater than the external diameter of described mandrel.The technique effect of this technical scheme is: the object arranging two semicircular ring is the installation facilitating whole limiting component, and the effect of groove is the position fixing two semicircular ring, the external diameter that the external diameter of the annulus combined is greater than mandrel just can play clamping and spacing effect.
Further, the inside wall of described core sleeve is provided with the axially extended tooth bar along described core sleeve or teeth groove, correspondingly on the lateral wall of described mandrel is provided with axially extended teeth groove along described mandrel or tooth bar.The technique effect of this technical scheme is: while mandrel transmits the pressure of high-pressure slurry, also need to transmit the torque from core sleeve, and the tooth bar (or teeth groove) on mandrel lateral wall and the teeth groove (or tooth bar) on core sleeve's inside wall can provide the propagation function of torque.
The beneficial effects of the utility model are: utilize impeller to make continuous print slurry fluid become the fluid of pulsed, realize mud pressure cyclic fluctuation with pulsed flow; The cyclic fluctuation of mud pressure impels mandrel appearance dither vertically; Mandrel dither vertically impels entire drill tool to produce equidirectional vibration, makes the static friction between drilling tool and the borehole wall change dynamic friction into, solves the backing pressure problem of creeping into, improves the drilling well effect of drill bit.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme of the utility model detailed description of the invention, below the accompanying drawing used required in describing detailed description of the invention is briefly described.Apparently, the accompanying drawing in the following describes is embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
The structural representation of the anti-backing pressure of the drilling tool for the directional well device that Fig. 1 provides for the utility model;
The longitdinal cross-section diagram of the impeller base of the anti-backing pressure of the drilling tool for the directional well device that Fig. 2 provides for the utility model;
The top view of the impeller base of the anti-backing pressure of the drilling tool for the directional well device that Fig. 3 provides for the utility model;
Fig. 4 is I place partial enlarged drawing in Fig. 1;
Fig. 5 is the cross-section cutaway view at F-F place in Fig. 1.
Reference numeral:
1-impeller; 2-impeller base; 3-diversion component;
4-elastomeric element; 5-mandrel; 6-core sleeve;
7-dams piston; 8-first seal; 801-back-up ring;
802-O RunddichtringO; 9-second seal; 10-toroidal cavity;
11-limiting component; 12-tooth bar; 13-teeth groove.
Detailed description of the invention
Be clearly and completely described the technical solution of the utility model below in conjunction with accompanying drawing, obviously, described embodiment is the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
In description of the present utility model, it should be noted that, orientation or the position relationship of the instruction such as term " " center ", " on ", D score, "left", "right", " vertically ", " level ", " interior ", " outward " they be based on orientation shown in the drawings or position relationship; be only the utility model and simplified characterization for convenience of description; instead of instruction or imply the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore can not be interpreted as restriction of the present utility model.In addition, term " first ", " second ", " the 3rd " only for describing object, and can not be interpreted as instruction or hint relative importance.
In description of the present utility model, it should be noted that, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or connect integratedly; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals.For the ordinary skill in the art, concrete condition the concrete meaning of above-mentioned term in the utility model can be understood.
The structural representation of the anti-backing pressure of the drilling tool for the directional well device that Fig. 1 provides for the utility model.As shown in Figure 1, the anti-backing pressure device of drilling tool for directional well arranges the mandrel 5 with central through hole, and the outside of mandrel 5 is enclosed with the identical core sleeve of axis direction 6, and mandrel 5 can move in the axial direction relative to core sleeve 6, further, mandrel 5 is not concordant with the upstream and downstream port of core sleeve 6.High-pressure slurry not only completely by the inner chamber of core sleeve 6, and passes through the inner chamber of mandrel 5 completely.The arrival end of mandrel 5 is positioned at the inner side of core sleeve 6, be provided with at the arrival end of mandrel 5 piston 7 that dams, high-pressure slurry flows into from core sleeve 6 inner chamber, arrives this piston 7 that dams, axial thrust is produced to mandrel 5, and high-pressure slurry all flows to downstream from the inner chamber of mandrel 5.At mandrel 5 on the inner chamber of lower exit end, impeller 1 is also installed.The rotating shaft of impeller 1, perpendicular to the axis direction of mandrel 5, when high-pressure slurry flows through the downstream of mandrel 5 inner chamber, can drives impeller 1 rotate.The rotation of impeller 1 makes continuous print high-pressure slurry fluid become the slurry fluid of pulsed, the slurry fluid of pulsed impels the pressure of slurry fluid to produce periodically fluctuation, the fluctuation of slurry fluid pressure cycle promotes mandrel 5 by the piston 7 that dams being positioned at upstream and produces axial vibration, and the axial vibration of mandrel 5 causes entire drill tool to vibrate vertically.Static friction between drilling tool and the borehole wall is transformed into dynamic friction by this vibration, greatly reduces friction factor, solves backing pressure problem, improves drilling well effect.
The longitdinal cross-section diagram of the impeller base 2 of the anti-backing pressure of the drilling tool for the directional well device that Fig. 2 provides for the utility model, the top view of the impeller base 2 of the anti-backing pressure of the drilling tool for the directional well device that Fig. 3 provides for the utility model.Further, on the basis of above-described embodiment, as shown in Figure 2,3, impeller 1 is arranged on impeller base 2, and impeller base 2 is arranged on the inner chamber of mandrel 5.Wherein, impeller 1 also can be directly installed on the inside wall of mandrel 5.Impeller 1 is arranged on mandrel 5 inner chamber by impeller base 2 by the present embodiment, avoids the inside wall that impeller 1 is directly installed on mandrel 5, facilitates dismounting and the maintenance of impeller 1 and impeller base 2, and the excessive impact force of high-pressure slurry is born in the rotating shaft decreasing impeller 1.
Further, on the basis of above-described embodiment, as shown in Figure 1, in impeller base 2 upstream of the anti-backing pressure device of drilling tool for directional well, diversion component 3 is installed, by the guide functions of this diversion component 3, high-pressure slurry only can impact the blade of impeller 1 rotating shaft side, and impeller 1 is ceaselessly rotated.Further, diversion component 3 makes the circulation bore of high-pressure slurry diminish suddenly, and flow velocity becomes large, more enhances the rotate effect of impeller 1.
Further, on the basis of above-described embodiment, as shown in Figure 1, in the upstream of the diversion component 3 of the anti-backing pressure device of drilling tool for directional well, elastomeric element 4 is installed.Because elastomeric element 4 has elastic force laterally, diversion component 3 and impeller base 2 are stuck in the draw-in groove of mandrel 5 inner chamber by elastomeric element 4.As shown in Figure 1, conveniently install impeller base 2, diversion component 3 and elastomeric element 4, this part of mandrel 5 can be independent segmented, is connected by screw thread with the mandrel 5 of upstream.
Further, on the basis of above-described embodiment, as shown in Figure 1, damming between piston 7 and core sleeve 6, be provided with the first seal 8.The effect of the first seal 8 is to stop the high-pressure slurry from mandrel 5 arrival end upstream to enter space between mandrel 5 and core sleeve 6.
Fig. 4 is I place partial enlarged drawing in Fig. 1.Preferably, on the basis of above-described embodiment, as shown in Figure 4, the first seal 8 is made up of back-up ring 801 and O RunddichtringO 802.Wherein O RunddichtringO 802 is enclosed within the groove of mandrel 5 lateral wall, and the both sides of O RunddichtringO 802 are respectively provided with a back-up ring 801, forms the position relationship that two back-up rings 801 clamp O RunddichtringO 802.The effect of O-ring seals is the space between the inside wall of the lateral wall of mandrel 5 and core sleeve 6 is sealed, and the effect of back-up ring 801 is the compression capability and the sealing effectiveness that increase O-ring seals.
Further, on the basis of above-described embodiment, as shown in Figure 1, between the inner side and the outside of mandrel 5 of core sleeve 6 port of export, also be provided with the second seal 9, make, between the first seal 8 and the second seal 9, to form a toroidal cavity 10 surrounded by mandrel 5 and core sleeve 6, in toroidal cavity 10, be packaged with lubrication oil.Lubrication oil can reduce the friction between mandrel 5 and core sleeve 6, the application life of both increases; And the sealing function of the first seal 8 and the second seal 9 effectively can prevent mud from entering gap between mandrel 5 and core sleeve 6, prevent the leakage of lubrication oil.Wherein, the second seal 9 is the same with the first seal 8, is also provided with back-up ring 801 and O RunddichtringO 802.
Further, on the basis of above-described embodiment, as shown in Figure 1, between the inner side of core sleeve 6 and the outside of mandrel 5, limiting component 11 is also provided with.The structure of limiting component 11 is: on the lateral wall of mandrel 5, installs the snap ring that an outside dimension is greater than mandrel 5 outside dimension, and in the upstream and downstream position of core sleeve 6 inner chamber, installs one respectively for stoping the baffle ring of snap ring movement.The effect of limiting component 11 is: restriction mandrel 5, relative to the shift length of core sleeve 6, ensures that mandrel 5 does not depart from core sleeve 6 all the time when axial vibration.
Further, on the basis of above-described embodiment, as shown in Figure 1, limiting component 11 comprises two the metal semicircular ring fastening and become a metal ring, and is arranged on two fixing baffle rings in core sleeve.Wherein, metal ring is arranged on the groove of mandrel 5 lateral wall, and groove is positioned at the downstream of the piston 7 that dams, and on metal ring external diameter surface, be provided with an O shape rubber ring, makes metal ring separate and to depart from mandrel 5.On the inside wall of core sleeve 6 upstream and downstream, as required the fixing baffle ring supporting with metal ring is set respectively, mandrel 5 is moved relative to core sleeve 6 upstream direction and downstream direction, all there is an extreme position, and cannot depart from core sleeve 6.As shown in Figure 1, in the present embodiment, limiting fixing baffle ring that mandrel 5 arrives updrift side extreme position is the joint that of being threaded with the arrival end of core sleeve 6 is with through hole, and limit to arrange fixing baffle ring and the conveniently mounting limit parts 11 that mandrel 5 arrives downstream direction extreme position, the location segment of mandrel 5 in downstream also arranges and is threaded, the internal diameter of second half section arrival end arranges less, as the fixing baffle ring of mandrel 5 downstream moving limit position.
Fig. 5 is the cross-section cutaway view at F-F place in Fig. 1.Further, on the basis of above-described embodiment, as shown in Figure 5, the inside wall of core sleeve 6 arranges the axially extended tooth bar 12 along core sleeve 6 or teeth groove 13, axially extended teeth groove 13 along mandrel 5 or tooth bar 12 are set simultaneously on the lateral wall of mandrel 5, and make the tooth bar 12 of two sidewalls engaged with teeth groove 13.Engaged tooth bar 12 and teeth groove 13 can ensure the transmission of torque of mandrel 5 and core sleeve 6.Wherein, tooth bar 12 and teeth groove 13 can also use other structures such as latch to substitute.
Last it is noted that above each embodiment is only in order to illustrate the technical solution of the utility model, be not intended to limit; Although be described in detail the utility model with reference to foregoing embodiments, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein some or all of technical characteristic; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of each embodiment technical scheme of the utility model.
Claims (10)
1., for the anti-backing pressure device of drilling tool of directional well, it is characterized in that, comprising:
Mandrel, described mandrel is the cavity being provided with through hole;
Core sleeve, described core sleeve is socketed in the outside of described mandrel in the mode that can move axially; High-pressure slurry flows through the inner chamber of described core sleeve, and flows through the inner chamber of described mandrel; The arrival end of described mandrel is provided with the piston that dams, described in the piston that dams can the partial pressure of high-pressure slurry be transferred on described mandrel, guarantee that high-pressure slurry flowing is unimpeded simultaneously;
Impeller, described impeller is arranged in described mandrel, and the rotating shaft of described impeller is perpendicular to the axis direction of described mandrel, and high-pressure slurry orders about described wheel rotation.
2. the anti-backing pressure device of the drilling tool for directional well according to claim 1, it is characterized in that, comprise impeller base, described impeller is arranged in impeller base, and described impeller base is arranged in described mandrel.
3. the anti-backing pressure device of the drilling tool for directional well according to claim 2, is characterized in that, comprise the diversion component being arranged on described impeller base upstream, and the water conservancy diversion direction of described diversion component is towards described impeller.
4. the anti-backing pressure device of the drilling tool for directional well according to claim 3, is characterized in that, comprise elastomeric element, and described elastomeric element is used for fixing described diversion component and described impeller base.
5. the anti-backing pressure device of the drilling tool for directional well according to claim 4, is characterized in that, described in dam between piston and described core sleeve and be provided with the first seal.
6. the anti-backing pressure device of the drilling tool for directional well according to claim 5, is characterized in that, described first seal comprises back-up ring and O RunddichtringO.
7. the anti-backing pressure device of the drilling tool for directional well according to claim 6, is characterized in that, between the inside wall of the described core sleeve port of export and the lateral wall of described mandrel, is provided with the second seal; Between described first seal and described second seal, form a toroidal cavity surrounded by described mandrel and described core sleeve, in described toroidal cavity, be provided with lubrication oil.
8. the anti-backing pressure of the drilling tool for the directional well device according to any one of claim 1-7, is characterized in that, between the inside wall of described core sleeve and the lateral wall of described mandrel, be also provided with limiting component; Described limiting component departs from described core sleeve for stoping described mandrel.
9. the anti-backing pressure device of the drilling tool for directional well according to claim 8, it is characterized in that, described limiting component comprises the groove being arranged on described mandrel lateral wall, and two semicircular ring; Two described semicircular ring are fastened in described groove, form the annulus that external diameter is greater than the external diameter of described mandrel.
10. the anti-backing pressure device of the drilling tool for directional well according to claim 1, it is characterized in that, the inside wall of described core sleeve is provided with the axially extended tooth bar along described core sleeve or teeth groove, correspondingly on the lateral wall of described mandrel is provided with axially extended teeth groove along described mandrel or tooth bar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520416341.7U CN204691679U (en) | 2015-06-16 | 2015-06-16 | The anti-backing pressure device of a kind of drilling tool for directional well |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520416341.7U CN204691679U (en) | 2015-06-16 | 2015-06-16 | The anti-backing pressure device of a kind of drilling tool for directional well |
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| Publication Number | Publication Date |
|---|---|
| CN204691679U true CN204691679U (en) | 2015-10-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520416341.7U Withdrawn - After Issue CN204691679U (en) | 2015-06-16 | 2015-06-16 | The anti-backing pressure device of a kind of drilling tool for directional well |
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| Country | Link |
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| CN (1) | CN204691679U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104912487A (en) * | 2015-06-16 | 2015-09-16 | 王岳 | Drilling tool backing pressure prevention device for directional well |
-
2015
- 2015-06-16 CN CN201520416341.7U patent/CN204691679U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104912487A (en) * | 2015-06-16 | 2015-09-16 | 王岳 | Drilling tool backing pressure prevention device for directional well |
| CN104912487B (en) * | 2015-06-16 | 2017-08-08 | 王岳 | A kind of anti-backing pressure device of drilling tool for directional well |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20151007 Effective date of abandoning: 20170808 |
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| AV01 | Patent right actively abandoned |