CN201915836U - Directional drilling system - Google Patents
Directional drilling system Download PDFInfo
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- CN201915836U CN201915836U CN2011200132750U CN201120013275U CN201915836U CN 201915836 U CN201915836 U CN 201915836U CN 2011200132750 U CN2011200132750 U CN 2011200132750U CN 201120013275 U CN201120013275 U CN 201120013275U CN 201915836 U CN201915836 U CN 201915836U
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Abstract
The utility model relates to a directional drilling system, which comprises a measuring probe, a first nonmagnetic drill stem, a second nonmagnetic drill stem, a communication cable drill stem, a communication cable water feeder, a data switching exchanger and a communication cable. Both left and right ends of the measuring probe are respectively provided with the first nonmagnetic drill stem and the second nonmagnetic drill stem, wherein the right end of the second nonmagnetic drill stem is connected with a drill bit; the left end of the first nonmagnetic drill stem is connected with the communication cable drill stem; the communication cable drill stem is connected with the communication cable water feeder through the communication cable; and the communication cable water feeder is connected with an orifice monitor through the communication cable. The directional drilling system has the beneficial effects that a measuring system is reasonably and efficiently applied to a directional drilling machine; and on the basis of variation of a track parameter of a horizontal directional drill in the drilling process, data is combined with an azimuth angle parameter of the drill bit and is transmitted to a ground control center through a universal serial bus, Ethernet or a telephone wire so as to complete on-line monitoring, analysis and display of parameters of a drilling track and a posture of a drilling tool and realize deep hole orientation of a deep hole.
Description
Technical field
The utility model relates to a kind of directional drilling system.
Background technology
Along with developing rapidly of China's economy and urbanization construction, the horizontal directional drill construction technology has obtained application more and more widely.Horizontal directional drill relies on high-precision location and guidance system, and to the drill bit control that detects in real time and rectify a deviation, along with the progress of electronic technology, the performance of guidance system has obtained quick raising.The directional drilling technology is a key technology of efficiently administering coal mine gas under the coal mine, also is the key technology of paying close attention in the world with develop actively in recent years always.Though China's coal-mine downhole orientation drilling technology is obtained bigger progress, but the core technology of creeping into equipment is limited by abroad always, under the coal mine in tunnel directional drilling and the geology controlled directional drilling, how the measuring system rational and effective being applied in the directional drilling machine, is continuous monitoring drilling track, the timely necessary tool of rectifying a deviation; It is the final purpose that realizes the deep hole orientation.Therefore providing a kind of centralized procurement to collect, transmit and analyzing is that the underground mine use of one is necessary in the directional drilling system and device of measurement of creeping into horizontal orientation and control.
The utility model content
The purpose of this utility model provides a kind of directional drilling system, to realize aperture and remote online instant playback drilling track and drilling tool attitude parameter, overcomes existing orientation and is drilled in the weak point that can not understand drilling track in the drilling process and deviation occur.
The purpose of this utility model is to be achieved through the following technical solutions:
A kind of directional drilling system, comprise the measurement inserting tube, the first no magnetic drilling rod, the second no magnetic drilling rod, logical cable formula drilling rod, logical cable formula water feeder, data switching exchane and communication cable, two ends, the described measurement inserting tube left and right sides are separately installed with the first no magnetic drilling rod and the second no magnetic drilling rod, wherein the second no magnetic drilling rod right-hand member is connected with drill bit, the first no magnetic drilling rod left end is connected with logical cable formula drilling rod, logical cable formula drilling rod is connected with logical cable formula water feeder by communication cable, logical cable formula water feeder is connected with the aperture monitor by communication cable, described data switching exchane is connected with compunication, and data switching exchane communicates to connect by optical fiber ethernet ring network and aperture monitor.
Described measurement inserting tube comprises cylinder shell, and described cylinder shell inside is provided with the treatment circuit plate, and the left and right sides of treatment circuit plate is respectively equipped with two-dimentional fluxgate magnetic core and accelerometer probe, and the right side side of accelerometer probe is provided with transmission signal slip ring.
Described logical cable formula drilling rod comprises shell, two ends, the described shell left and right sides are fillet of tool joint pins and tool joint box respectively, the axis place, inside of shell is provided with central conductor, central conductor is provided with the insulation connected body outward, the two ends, the left and right sides of central conductor are respectively equipped with cable female joint and cable male joint, be provided with insulation between the infall of cable female joint and cable male joint and central conductor and the shell and support, cable male joint right side is provided with Spring capable of diameter varying.
Described logical cable formula water feeder comprises the water feeder shell, the axis place of described water feeder shell is provided with lead, water feeder shell left end is provided with the fast-wiring post, and water feeder shell lower end is provided with the water under high pressure joint near the left end place, and water feeder shell right-hand member is provided with the female joint of water feeder cable.
Described data switching exchane is the exchanges data joint.
The beneficial effects of the utility model are: the measuring system rational and effective is applied in the directional drilling machine, be drilled in the variation of trajectory parameters in the process of creeping into based on horizontal orientation, azimuth parameter in conjunction with drill bit, transfer to the ground control centre through universal serial bus, Ethernet or telephone wire, and finish on-line monitoring, analysis, demonstration drilling track and drilling tool attitude parameter, realize the deep hole orientation.
Description of drawings
With reference to the accompanying drawings the utility model is described in further detail below.
Fig. 1 is the described directional drilling system architecture of a utility model embodiment schematic diagram;
Fig. 2 is the generalized section of the described directional drilling systematic survey of the utility model embodiment inserting tube;
Fig. 3 is the logical cable formula drilling rod generalized section of the described directional drilling of the utility model embodiment system;
Fig. 4 is the generalized section of the logical cable formula water feeder of the described directional drilling of the utility model embodiment system.
Among the figure:
1, the first no magnetic drilling rod; 2, measure inserting tube; 3, logical cable formula drilling rod; 4, drill bit; 5, logical cable formula water feeder; 6, aperture monitor; 7, optical fiber ethernet ring network; 8, data switching exchane; 9, computer; 10, communication cable; 11, cylinder shell; 12, accelerometer probe; 13, two-dimentional fluxgate magnetic core; 14, treatment circuit plate; 15, transmission signal slip ring; 16, fillet of tool joint pins; 17, cable female joint; 18, insulation is supported; 19, insulation connected body; 20, central conductor; 21, shell; 22, cable male joint; 23, Spring capable of diameter varying; 24, tool joint box; 25, fast-wiring post; 26, water under high pressure joint; 27, water feeder shell; 28, lead; 29, water feeder cable female joint; 30, the second no magnetic drilling rod.
The specific embodiment
Shown in Fig. 1-4, the described a kind of directional drilling of the utility model embodiment system, comprise and measure inserting tube 2, the first no magnetic drilling rod 1, the second no magnetic drilling rod 30, logical cable formula drilling rod 3, logical cable formula water feeder 5, data switching exchane 8 and communication cable 10, two ends, described measurement inserting tube 2 left and right sides are separately installed with the first no magnetic drilling rod 1 and the second no magnetic drilling rod 30, wherein second no magnetic drilling rod 30 right-hand members are connected with drill bit 4, first no magnetic drilling rod 1 left end is connected with logical cable formula drilling rod 3, logical cable formula drilling rod 3 is connected with logical cable formula water feeder 5 by communication cable 10, logical cable formula water feeder 5 is connected with aperture monitor 6 by communication cable 10, described data switching exchane 8 communicates to connect with computer 9, and data switching exchane 8 communicates to connect by optical fiber ethernet ring network 7 and aperture monitor 6.
Measure inserting tube 2 and comprise cylinder shell 11, cylinder shell 11 inside are provided with treatment circuit plate 14, the left and right sides of treatment circuit plate 14 is respectively equipped with two-dimentional fluxgate magnetic core 13 and accelerometer probe 12, and the right side side of accelerometer probe 12 is provided with transmission signal slip ring 15.
Logical cable formula drilling rod 3 comprises shell 21, two ends, shell 21 left and right sides are fillet of tool joint pins 16 and tool joint box 24 respectively, the axis place, inside of shell 21 is provided with central conductor 20, the central conductor 20 outer insulation connected bodies 19 that are provided with, the two ends, the left and right sides of central conductor 20 are respectively equipped with cable female joint 17 and cable male joint 22, be provided with insulation between the infall of cable female joint 17 and cable male joint 22 and central conductor 20 and the shell 21 and support 18, cable male joint 22 right sides are provided with Spring capable of diameter varying 23.
Logical cable formula water feeder 5 comprises water feeder shell 27, the axis place of water feeder shell 27 is provided with lead 28, water feeder shell 27 left ends are provided with fast-wiring post 25 water feeder shells 27 lower ends and are provided with water under high pressure joint 26 near the left end place, and water feeder shell 27 right-hand members are provided with water feeder cable female joint 29.
Data switching exchane 8 is the exchanges data joint.
When the described directional drilling of the utility model embodiment system uses, water under high pressure is delivered to the hole inner motor by logical cable formula drilling rod 3, the rotor of inner motor inside, hole rotates under the percussion of water under high pressure, drive the purpose that drill bit 4 rotations reach brokenly coal by preceding end bearing, in the process of creeping into, itself does not change drilling rod, only do rotatablely moving of drill bit, thereby reduce the load of rig effectively, measure the inserting tube 2 main azimuths of measuring drill bit 4, parameters such as inclination angle, can calculate the coordinate of each survey mark with trigonometric function according to the hole intrinsic parameter of measuring, can depict the perspective view of this space curve on level and vertical plane, and with the design track compare, in time adjust the bent sub direction according to the deviation situation, adhere to specification to greatest extent in the hope of making drilling trace; Measuring inserting tube 2 and be connected by no magnetic drilling rod 1 with drill bit 4, mainly is to isolate drill bit to produce magnetic effect influence measurement inserting tube certainty of measurement in the process of creeping into.
Measuring inserting tube 2 mainly is made up of cylinder shell 11, accelerometer probe 12, fluxgate magnetic core 13, treatment circuit plate 14, transmission signal slip ring 15 etc., measure inserting tube 2 and measure the angle of slope of drill bit 4 and the signal of dip azimuth angle by accelerometer probe 12 and fluxgate magnetic core 13, measure inserting tube 2 in use, place along the borehole wall, since the action of gravity of eccentric weight, outside framework pivot static after.It is parallel with the axis of cylinder shell that its plane can keep all the time, promptly parallel with the inclined plane of inclined shaft, the measured acceleration Gx of accelerometer this moment is the component of acceleration of gravity on the housing axis. Gx=Gm Cos θ (Gm is an acceleration of gravity) can calculate the angle θ of section that inclines thus.At outside framework in axle rotation, because the action of gravity of hemisphere inner frame self, inner frame 3 also rotates and is static, hemisphere plane 16 maintenance levels, the fluxgate magnetic core of horizontal fixed on hemisphere inner frame plane also keeps level, this moment, two fluxgate component ex, the ey value of output just can calculate φ in the dip azimuth angle: ex=exmCos φ, ey=eym Sin φ.The accelerometer probe is handled the bus signals that the back becomes standard with measured Gx, ex, the ey signal of fluxgate magnetic core through treatment circuit plate 14, by circuit by the outside framework axle number to electric slip ring 15, be drawn out to central conductor 20 in the logical cable formula drilling rod 3 with the electric slip ring interface line by the perforate of shell body end again.
The quantity of logical cable formula drilling rod 3 is to increase according to the degree of depth of holing, drilling rod is the female joint 24 that the fillet of tool joint pins 16 of a logical cable formula drilling rod 3 is inserted the logical cable formula drilling rod of another root when connecting, and the cable female joint 16 of logical cable formula drilling rod 3 inserts in the cable male joint 22 of the logical cable formula drilling rod of another root in jointed rod; Make the transmission of central conductor 20 more reliable after Spring capable of diameter varying 23 is squeezed, form a coaxial cable pattern between central conductor 20 and the shell 21, insulation support 18 and insulation connected body 19 are the insulating layers between central conductor 20 and the shell 21; Signal is transmitted in the lead 28 that leads in the cable formula water feeder 5 through central conductor 20.
Water feeder cable female joint 29 in the logical cable formula water feeder 5 is connected with the cable male joint 22 in the logical cable formula drilling rod 3, lead 28 links into an integrated entity with central conductor 20 and carries out the signal transmission, water under high pressure is delivered to the hole inner motor by water under high pressure joint 26 to logical cable formula drilling rod 3, the rotor of inner motor inside, hole rotates under the percussion of water under high pressure, drives the purpose that drill bit 4 rotations reach brokenly coal by preceding end bearing.Signal is by lead 28 transmission fast-wiring posts 25, signal is transmitted in through fast-wiring post 25 and carries out display analysis in the aperture monitor 6, be transmitted in ground data switch or interface 8 by optical fiber ethernet ring network 7, send into computer 9 after process data switching exchane or interface 8 are handled signal and analyze.
The utility model is not limited to above-mentioned preferred forms; anyone can draw other various forms of products under enlightenment of the present utility model; no matter but on its shape or structure, do any variation; every have identical with a application or akin technical scheme, all drops within the protection domain of the present utility model.
Claims (4)
1. directional drilling system, comprise and measure inserting tube (2), the first no magnetic drilling rod (1), the second no magnetic drilling rod (30), logical cable formula drilling rod (3), logical cable formula water feeder (5), data switching exchane (8) and communication cable (10), it is characterized in that: measure inserting tube (2) two ends, the left and right sides and be separately installed with the first no magnetic drilling rod (1) and the second no magnetic drilling rod (30), wherein second no magnetic drilling rod (30) right-hand member is connected with drill bit (4), first no magnetic drilling rod (1) left end is connected with logical cable formula drilling rod (3), logical cable formula drilling rod (3) is connected with logical cable formula water feeder (5) by communication cable (10), and logical cable formula water feeder (5) is connected with aperture monitor (6) by communication cable (10); Data switching exchane (8) communicates to connect with computer (9), and data switching exchane (8) communicates to connect by optical fiber ethernet ring network (7) and aperture monitor (6).
2. directional drilling according to claim 1 system, it is characterized in that: measure inserting tube (2) and comprise cylinder shell (11), cylinder shell (11) inside is provided with treatment circuit plate (14), the left and right sides of treatment circuit plate (14) is respectively equipped with two-dimentional fluxgate magnetic core (13) and accelerometer probe (12), and the right side side of accelerometer probe (12) is provided with transmission signal slip ring (15).
3. directional drilling according to claim 1 system, it is characterized in that: logical cable formula drilling rod (3) comprises shell (21), the two ends, the left and right sides of shell (21) are respectively equipped with fillet of tool joint pins (16) and tool joint box (24), the inner axis of shell (21) place is provided with central conductor (20), the outer insulation connected body (19) that is provided with of central conductor (20), the two ends, the left and right sides of central conductor (20) are respectively equipped with cable female joint (17) and cable male joint (22), be provided with insulation between the infall of cable female joint (17) and cable male joint (22) and central conductor (20) and the shell (21) and support (18), cable male joint (22) right side is provided with Spring capable of diameter varying (23).
4. according to each described directional drilling system of claim 1-3, it is characterized in that: logical cable formula water feeder (5) comprises water feeder shell (27), the axis place of water feeder shell (27) is provided with lead (28), water feeder shell (27) left end is provided with fast-wiring post (25), water feeder shell (27) lower end is provided with water under high pressure joint (26) near the left end place, and water feeder shell (27) right-hand member is provided with water feeder cable female joint (29).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200132750U CN201915836U (en) | 2011-01-17 | 2011-01-17 | Directional drilling system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200132750U CN201915836U (en) | 2011-01-17 | 2011-01-17 | Directional drilling system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201915836U true CN201915836U (en) | 2011-08-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200132750U Expired - Fee Related CN201915836U (en) | 2011-01-17 | 2011-01-17 | Directional drilling system |
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Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102337844A (en) * | 2011-09-15 | 2012-02-01 | 中煤科工集团重庆研究院 | Directional drilling signal transmission drill pipe |
| CN102808580A (en) * | 2012-08-10 | 2012-12-05 | 中国地质大学（武汉） | Laser directional drilling tool for coal-bed-methane level development hole and drilling method using same |
| CN102926686A (en) * | 2012-11-01 | 2013-02-13 | 三一重型装备有限公司 | Directional water feeder and directional drilling machine |
| CN103498664A (en) * | 2013-09-26 | 2014-01-08 | 中煤科工集团重庆研究院有限公司 | Device and method for measuring real-time track of rotary drilling while drilling |
| CN104088625A (en) * | 2014-05-21 | 2014-10-08 | 武汉长盛煤安科技有限公司 | Underground coal mine drilling wireless while drilling rail and hole depth measurement device |
| CN104763412A (en) * | 2015-02-13 | 2015-07-08 | 中煤科工集团西安研究院有限公司 | Orientation gamma detecting tube for underground coal-seam-following drilling monitoring of coal mine |
| CN105547742A (en) * | 2015-12-11 | 2016-05-04 | 天地科技股份有限公司 | Coal sample sampling method and device |
| CN106014384A (en) * | 2016-06-30 | 2016-10-12 | 中国石油集团西部钻探工程有限公司 | Well deviation direction measuring short section |
| CN107143284A (en) * | 2017-05-05 | 2017-09-08 | 淮北矿业（集团）有限责任公司 | The application method of the method for coal mine long range throughbore draining, equipment and equipment |
| CN107143327A (en) * | 2017-06-23 | 2017-09-08 | 四川省金核地质勘查工程有限公司 | A kind of method of through logical cable |
| CN107605402A (en) * | 2017-11-06 | 2018-01-19 | 中煤科工集团西安研究院有限公司 | The broken soft seam flexibility internal control spin orientation drilling system of underground coal mine and drilling method |
| CN110821405A (en) * | 2019-11-26 | 2020-02-21 | 长江大学 | Ground automatic control device and method for underground rapid directional aiming |
| CN111677451A (en) * | 2020-05-12 | 2020-09-18 | 中煤科工集团西安研究院有限公司 | Coal mine underground directional drilling while-drilling hydraulic hole making device, drilling system and method |
| CN112228028A (en) * | 2020-09-14 | 2021-01-15 | 山东科技大学 | Remote-control efficient hydraulic coal seam cutting permeability increasing device and construction method |
| CN112681985A (en) * | 2020-12-28 | 2021-04-20 | 中海石油(中国)有限公司 | Intelligent drilling platform based on intelligent drill rod and drilling machine top drive |
| CN112901073A (en) * | 2021-01-29 | 2021-06-04 | 河南理工大学 | High-position directional long drilling construction device for complex roof rock layer |
| CN114215507A (en) * | 2021-05-21 | 2022-03-22 | 华北科技学院(中国煤矿安全技术培训中心) | Gas pressure measuring device and method based on directional drilling machine |
| CN114382406A (en) * | 2022-02-22 | 2022-04-22 | 山西开源益通矿业设备制造有限公司 | Directional impact rock-hole construction equipment |
| CN116084839A (en) * | 2023-04-11 | 2023-05-09 | 中南大学 | Space attitude self-adaptive intelligent targeted drilling tool system under complex geological environment |
-
2011
- 2011-01-17 CN CN2011200132750U patent/CN201915836U/en not_active Expired - Fee Related
Cited By (28)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102337844B (en) * | 2011-09-15 | 2014-03-19 | 中煤科工集团重庆研究院 | Directional drilling signal transmission drill pipe |
| CN102337844A (en) * | 2011-09-15 | 2012-02-01 | 中煤科工集团重庆研究院 | Directional drilling signal transmission drill pipe |
| CN102808580A (en) * | 2012-08-10 | 2012-12-05 | 中国地质大学（武汉） | Laser directional drilling tool for coal-bed-methane level development hole and drilling method using same |
| CN102808580B (en) * | 2012-08-10 | 2014-07-30 | 中国地质大学（武汉） | Laser directional drilling tool for coal-bed-methane level development hole and drilling method using same |
| CN102926686B (en) * | 2012-11-01 | 2015-10-28 | 三一重型装备有限公司 | Directed water feeder and directional drilling machine |
| CN102926686A (en) * | 2012-11-01 | 2013-02-13 | 三一重型装备有限公司 | Directional water feeder and directional drilling machine |
| CN103498664A (en) * | 2013-09-26 | 2014-01-08 | 中煤科工集团重庆研究院有限公司 | Device and method for measuring real-time track of rotary drilling while drilling |
| CN104088625A (en) * | 2014-05-21 | 2014-10-08 | 武汉长盛煤安科技有限公司 | Underground coal mine drilling wireless while drilling rail and hole depth measurement device |
| CN104763412A (en) * | 2015-02-13 | 2015-07-08 | 中煤科工集团西安研究院有限公司 | Orientation gamma detecting tube for underground coal-seam-following drilling monitoring of coal mine |
| CN105547742A (en) * | 2015-12-11 | 2016-05-04 | 天地科技股份有限公司 | Coal sample sampling method and device |
| CN105547742B (en) * | 2015-12-11 | 2020-12-01 | 天地科技股份有限公司 | Coal sample sampling method and device |
| CN106014384A (en) * | 2016-06-30 | 2016-10-12 | 中国石油集团西部钻探工程有限公司 | Well deviation direction measuring short section |
| CN107143284A (en) * | 2017-05-05 | 2017-09-08 | 淮北矿业（集团）有限责任公司 | The application method of the method for coal mine long range throughbore draining, equipment and equipment |
| CN107143327A (en) * | 2017-06-23 | 2017-09-08 | 四川省金核地质勘查工程有限公司 | A kind of method of through logical cable |
| CN107605402B (en) * | 2017-11-06 | 2019-05-21 | 中煤科工集团西安研究院有限公司 | The broken soft seam flexibility internal control spin orientation drilling system of underground coal mine and drilling method |
| CN107605402A (en) * | 2017-11-06 | 2018-01-19 | 中煤科工集团西安研究院有限公司 | The broken soft seam flexibility internal control spin orientation drilling system of underground coal mine and drilling method |
| CN110821405A (en) * | 2019-11-26 | 2020-02-21 | 长江大学 | Ground automatic control device and method for underground rapid directional aiming |
| CN111677451B (en) * | 2020-05-12 | 2022-05-10 | 中煤科工集团西安研究院有限公司 | Coal mine underground directional drilling while-drilling hydraulic hole making device, drilling system and method |
| CN111677451A (en) * | 2020-05-12 | 2020-09-18 | 中煤科工集团西安研究院有限公司 | Coal mine underground directional drilling while-drilling hydraulic hole making device, drilling system and method |
| CN112228028A (en) * | 2020-09-14 | 2021-01-15 | 山东科技大学 | Remote-control efficient hydraulic coal seam cutting permeability increasing device and construction method |
| WO2022052288A1 (en) * | 2020-09-14 | 2022-03-17 | 山东科技大学 | Remotely controlled high-efficiency hydraulic cutting device for permeability increase of coal seam, and construction method |
| CN112681985A (en) * | 2020-12-28 | 2021-04-20 | 中海石油(中国)有限公司 | Intelligent drilling platform based on intelligent drill rod and drilling machine top drive |
| CN112681985B (en) * | 2020-12-28 | 2022-11-01 | 中海石油(中国)有限公司 | Intelligent drilling platform based on intelligent drill rod and drilling machine top drive |
| CN112901073A (en) * | 2021-01-29 | 2021-06-04 | 河南理工大学 | High-position directional long drilling construction device for complex roof rock layer |
| CN114215507A (en) * | 2021-05-21 | 2022-03-22 | 华北科技学院(中国煤矿安全技术培训中心) | Gas pressure measuring device and method based on directional drilling machine |
| CN114215507B (en) * | 2021-05-21 | 2023-11-17 | 华北科技学院(中国煤矿安全技术培训中心) | Gas pressure measuring device and method based on directional drilling machine |
| CN114382406A (en) * | 2022-02-22 | 2022-04-22 | 山西开源益通矿业设备制造有限公司 | Directional impact rock-hole construction equipment |
| CN116084839A (en) * | 2023-04-11 | 2023-05-09 | 中南大学 | Space attitude self-adaptive intelligent targeted drilling tool system under complex geological environment |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110803 Termination date: 20190117 |
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| CF01 | Termination of patent right due to non-payment of annual fee |