$\require{mediawiki-texvc}$

연합인증

연합인증 가입 기관의 연구자들은 소속기관의 인증정보(ID와 암호)를 이용해 다른 대학, 연구기관, 서비스 공급자의 다양한 온라인 자원과 연구 데이터를 이용할 수 있습니다.

이는 여행자가 자국에서 발행 받은 여권으로 세계 각국을 자유롭게 여행할 수 있는 것과 같습니다.

연합인증으로 이용이 가능한 서비스는 NTIS, DataON, Edison, Kafe, Webinar 등이 있습니다.

한번의 인증절차만으로 연합인증 가입 서비스에 추가 로그인 없이 이용이 가능합니다.

다만, 연합인증을 위해서는 최초 1회만 인증 절차가 필요합니다. (회원이 아닐 경우 회원 가입이 필요합니다.)

연합인증 절차는 다음과 같습니다.

최초이용시에는
ScienceON에 로그인 → 연합인증 서비스 접속 → 로그인 (본인 확인 또는 회원가입) → 서비스 이용

그 이후에는
ScienceON 로그인 → 연합인증 서비스 접속 → 서비스 이용

연합인증을 활용하시면 KISTI가 제공하는 다양한 서비스를 편리하게 이용하실 수 있습니다.

Directional drift and drill PDC drill bit 원문보기

IPC분류정보
국가/구분 United States(US) Patent 등록
국제특허분류(IPC7판)
  • E21B-010/00
출원번호 US-0918763 (1997-08-25)
발명자 / 주소
  • Beaton Timothy P.
출원인 / 주소
  • Smith International, Inc.
대리인 / 주소
    Rosenthal & Osha LLP
인용정보 피인용 횟수 : 159  인용 특허 : 8

초록

A PDC bit for cutting a hole below a point in a formation, the diameter of the hole being greater than the diameter of the hole above the point, comprising: a bit body having an axis of rotation, a first cutting portion having a first radial extent from the axis of rotation, a second cutting portion

대표청구항

[ What is claimed is:] [1.] A drill bit for drilling a hole having a diameter greater than a diameter of a smallest opening through which the drill bit can pass, the drill bit comprising:a bit body having an axis of rotation;a cutting surface at one end of the bit body having a geometric axis latera

이 특허에 인용된 특허 (8)

  1. Warren Tommy M. (Coweta OK) Sinor Lawrence A. (Tulsa OK), Anti-whirl underreamer.
  2. Tandberg Geir (Biskop Sigurdsgate 11 N-7042 Trondheim NOX), Combination drill bit.
  3. Grappendorf Richard H. (Riverton UT) Sirrine Gordon G. (Sandy UT) Davis John S. (Sandy UT), Drill bit.
  4. Lf Stig U. (Sunne SEX), Eccentric drilling tool.
  5. Pastusek Paul E. (Salt Lake City UT) Thayn Corey S. (Lehi UT), Reamer wing for enlarging a borehole below a smaller-diameter portion therof.
  6. Azar Michael G. (The Woodlands TX), Self-centering polycrystalline diamond cutting rock bit.
  7. Keith Carl W. (Spring TX) King William W. (Spring TX) Clayton Robert I. (Houston TX), Unbalanced PDC drill bit with right hand walk tendencies, and method of drilling right hand bore holes.
  8. Williams ; Jr. Edward B. (College Station TX), Uninterrupted drill bit.

이 특허를 인용한 특허 (159)

  1. Radford, Steven R., Actuation assemblies, hydraulically actuated tools for use in subterranean boreholes including actuation assemblies and related methods.
  2. Radford, Steven R., Actuation assemblies, hydraulically actuated tools for use in subterranean boreholes including actuation assemblies and related methods.
  3. Radford, Steven R., Actuation mechanisms for downhole assemblies and related downhole assemblies and methods.
  4. Radford, Steven R., Actuation mechanisms for downhole assemblies and related downhole assemblies and methods.
  5. Hoffmaster, Carl M.; Truax, David K.; Beaton, Timothy P., Advanced expandable reaming tool.
  6. Hoffmaster,Carl M.; Truax,David K.; Beaton,Timothy P., Advanced expandable reaming tool.
  7. Hoffmaster,Carl M.; Truax,David K.; Beaton,Timothy P., Advanced expandable reaming tool.
  8. Hall,David R.; Dahlgren,Scott, Apparatus and method for vibrating a drill bit.
  9. Treviranus, Joachim; Freyer, Carsten; Oppelaar, Hans-Robert, Automated steerable hole enlargement drilling device and methods.
  10. Coy M. Fielder ; Rogerio H. Silva, Bi-center bit adapted to drill casing shoe.
  11. Fielder, Coy M.; Silva, Rogerio H., Bi-center bit adapted to drill casing shoe.
  12. Cobos Rojas Austreberto F.,MXX, Bi-center bit assembly.
  13. Hall,David R.; Leany,Francis; Dahlgren,Scott; Wilde,Tyson J., Bi-center drill bit.
  14. Beaton Timothy P. ; Truax David, Bi-centered drill bit having improved drilling stability mud hydraulics and resistance to cutter damage.
  15. Hall,David R.; Dahlgren,Scott; Wilde,Tyson J., Cam assembly in a downhole component.
  16. Hall, David R.; Morris, Thomas, Central cutting region of a drilling head assembly.
  17. Hall, David R.; Lundgreen, David, Clutch for a jack element.
  18. Hall, David R.; Lundgreen, David, Clutch for a jack element.
  19. Radford, Steven R.; Ohm, Amanda K.; Kulkarni, Ajay V., Components of drilling assemblies, drilling assemblies, and methods of stabilizing drilling assemblies in wellbores in subterranean formations.
  20. Nevlud,Kenneth M.; Beaton,Timothy P., Concentric expandable reamer and method.
  21. Oxford, James Andy, Corrodible triggering elements for use with subterranean borehole tools having expandable members and related methods.
  22. Oxford, James Andy, Corrodible triggering elements for use with subterranean borehole tools having expandable members and related methods.
  23. Hall, David R.; Crockett, Ronald B.; Skeem, Marcus; Leany, Francis; Webb, Casey, Cutting element attached to downhole fixed bladed bit at a positive rake angle.
  24. Hall, David R.; Crockett, Ronald B.; Skeem, Marcus; Leany, Francis; Webb, Casey, Cutting element attached to downhole fixed bladed bit at a positive rake angle.
  25. Lyons, Nicholas J., Cutting structures, tools for use in subterranean boreholes including cutting structures and related methods.
  26. Lyons, Nicholas J., Cutting structures, tools for use in subterranean boreholes including cutting structures and related methods.
  27. Hall, David R.; Crockett, Ronald B.; Dahlgren, Scott, Degradation assembly.
  28. Hall, David R.; Hall, Jr., H. Tracy, Dense diamond body.
  29. Hart, Steven James; Watson, Graham R., Design method for drillout bi-center bits.
  30. Hall, David R.; Bailey, John D.; Crockett, Ronald B., Downhole drill bit.
  31. Hall, David R.; Bailey, John D.; Crockett, Ronald B., Downhole drill bit.
  32. Hall, David R.; Bailey, John D.; Crockett, Ronald B., Downhole drill bit.
  33. Hall, David R.; Bailey, John; Dahlgren, Scott, Downhole hammer assembly.
  34. Hall, David R.; Lundgreen, David; Shumway, Jim; Nelson, Nathan; Wise, Daryl; Turner, Paula, Downhole jack assembly sensor.
  35. Hall, David R.; Lundgreen, David; Shumway, Jim; Nelson, Nathan; Wise, Daryl; Turner, Paula, Downhole jack assembly sensor.
  36. Hall, David R.; Bailey, John, Downhole mechanism.
  37. Hall, David R.; Bailey, John, Downhole mechanism.
  38. Hall, David R.; Dahlgren, Scott; Marshall, Jonathan, Downhole percussive tool with alternating pressure differentials.
  39. Hall, David R.; Dahlgren, Scott; Marshall, Jonathan, Downhole percussive tool with alternating pressure differentials.
  40. Hall, David R.; Lundgreen, David; Wise, Daryl, Downhole steering.
  41. Gentry, Steven Richard, Downhole tools having activation members for moving movable bodies thereof and methods of using such tools.
  42. Hall, David R.; Dahlgren, Scott; Marshall, Jonathan, Downhole turbine.
  43. Hall, David R.; Bailey, John, Downhole valve mechanism.
  44. Thigpen, Gary M.; Keith, Carl W., Drag-type casing mill/drill bit.
  45. Hall, David R., Drill bit.
  46. Hall, David R.; Bailey, John; Webb, Casey, Drill bit.
  47. Hall, David R.; Leany, Francis, Drill bit cutter pocket restitution.
  48. Hall, David R.; Bailey, John D., Drill bit nozzle.
  49. Hall, David R.; Dahlgren, Scott; Marshall, Jonathan, Drill bit steering assembly.
  50. Hall, David R.; Durrand, Christopher; Turner, Paula; Wise, Daryl, Drill bit transducer device.
  51. Hall, David R.; Leany, Francis; Crockett, Ronald B.; Webb, Casey; Skeem, Marcus, Drill bit with a pointed cutting element.
  52. Hall, David R.; Leany, Francis; Crockett, Ronald B.; Webb, Casey; Skeem, Marcus, Drill bit with a pointed cutting element and a shearing cutting element.
  53. Hall, David R.; Leany, Francis; Fox, Joe; Wilde, Tyson J.; Black, Boyd, Drill bit with a retained jack element.
  54. Hall, David R.; Turner, Paula; Durrand, Christopher, Drill bit with an electrically isolated transmitter.
  55. Thigpen, Gary M.; Keith, Carl W., Drill out bi-center bit and method for using same.
  56. Campbell,John E.; Dewey,Charles H.; Underwood,Lance D.; Schmidt,Ronald G., Drilling and hole enlargement device.
  57. Mackay, Alexander Craig; Espiritu, George Armando; Dewey, Charles H., Drilling and hole enlargement device.
  58. Radford, Steven R.; Sinor, L. Allen; Nesheim, Anders K., Drilling assemblies including expandable reamers and expandable stabilizers, and related methods.
  59. Hall, David R.; Balley, John; Kudla, Matt; Fox, Joe, Drilling at a resonant frequency.
  60. Graham R. Watson ; Steven James Hart GB, Drillout bi-center bit.
  61. Radford, Steven R.; Trinh, Khoi Q., Earth-boring tools including expandable members and status indicators and methods of making and using such earth-boring tools.
  62. Laing, Robert A.; Ireland, Kelly D.; Gautam, Anurag; Radford, Steven R., Expandable apparatus and related methods.
  63. Radford, Steven R.; Gautam, Anurag; Laing, Robert A., Expandable apparatus and related methods.
  64. Radford, Steven R.; Gautam, Anurag; Laing, Robert A., Expandable apparatus and related methods.
  65. Jean P. Buytaert, Expandable centralizer.
  66. Radford, Steven R.; Shu, Scott Shiquiang; Shale, Les T.; Morris, Mark E.; Kizziar, Mark R.; Zahradnik, Anton F., Expandable earth-boring wellbore reamers and related methods.
  67. Radford, Steven R.; Kizziar, Mark R.; Jenkins, Mark A., Expandable reamer apparatus including stabilizers.
  68. Radford, Steven R.; Oesterberg, Marcus; Trinh, Khoi Q.; Miller, Timothy; Anandampillai, Shyam; Jurica, Chad T.; Herberg, Wolfgang E.; Haubold, Carsten; Jakubeit, Christopher; Wiegmann, Michael; Behnsen, Jens; Faber, Hans-Juergen, Expandable reamer assemblies, bottom hole assemblies, and related methods.
  69. Radford, Steven R.; Oesterberg, Marcus; Trinh, Khoi Q.; Miller, Timothy; Anandampillai, Shyam; Jurica, Chad T.; Herberg, Wolfgang Eduard; Haubold, Carsten; Jakubeit, Christopher; Wiegmann, Michael; Behnsen, Jens; Faber, Hans-Juergen, Expandable reamer assemblies, bottom-hole assemblies, and related methods.
  70. Radford, Steven R.; Shu, Scott Shiqiang; Shale, Les T.; Morris, Mark E.; Kizziar, Mark R.; Zahradnik, Anton F., Expandable reamer tools.
  71. Radford, Steven R.; Miller, Timothy; Oesterberg, Marcus, Expandable reamers and methods of using expandable reamers.
  72. Radford, Steven R.; Miller, Timothy; Oesterberg, Marcus, Expandable reamers and methods of using expandable reamers.
  73. Radford, Steven R.; Shu, Scott S.; Shale, Les T.; Morris, Mark E.; Kizziar, Mark R.; Zahradnik, Anton F., Expandable reamers for earth-boring applications and methods of using the same.
  74. Poteet, III, Carl E., Expandable reamers having nonlinearly expandable blades, and related methods.
  75. Poteet, III, Carl E., Expandable reamers having sliding and rotating expandable blades, and related methods.
  76. Dewey, Charles H.; Xu, Wei, Expandable underreamer/stabilizer.
  77. Dewey,Charles H.; Xu,Wei, Expandable underreamer/stabilizer.
  78. Dewey, Charles H.; Desai, Praful C.; Campbell, John E., Expandable window milling bit and methods of milling a window in casing.
  79. Hall, David R.; Crockett, Ronald B.; Skeem, Marcus; Leany, Francis; Webb, Casey, Fixed bladed bit that shifts weight between an indenter and cutting elements.
  80. Underwood, Lance D.; Dewey, Charles H., Flexible directional drilling apparatus and method.
  81. Hall, David R.; Dahlgren, Scott; Turner, Paula; Durrand, Christopher; Marshall, Jonathan, Flow guide actuation.
  82. Hall, David R.; Dahlgren, Scott; Turner, Paula; Durrand, Christopher; Marshall, Jonathan, Flow guide actuation.
  83. Hall, David R., Fluid-actuated hammer bit.
  84. Hall, David R.; Skeem, Marcus; Leany, Francis, High impact resistant degradation element.
  85. Hall, David R.; Crockett, Ronald B.; Webb, Casey; Beazer, Michael, High impact resistant tool with an apex width between a first and second transitions.
  86. Meister, Matthias; Herberg, Wolfgang E.; Bothmann, Gunnar; Treviranus, Joachim; Freyer, Carsten; Oppelaar, Hans-Robert, Hole enlargement drilling device and methods for using same.
  87. Meister, Matthias; Herberg, Wolfgang Eduard; Bothman, Gunnar; Treviranus, Joachim; Freyer, Carsten; Oppelaar, Hans-Robert, Hole enlargement drilling device and methods for using same.
  88. Wu, Jian; Hu, Jianbing; Terracina, Dwayne P; Ray, Tommy G, Hydraulic actuation of a downhole tool assembly.
  89. Hall, David R.; Leany, Francis; Bailey, John, Indenting member for a drill bit.
  90. Hall, David R.; Leany, Francis; Webb, Casey; Skeem, Marcus, Inner bit disposed within an outer bit.
  91. Hall,David R.; Shumway,Jim, Jack element adapted to rotate independent of a drill bit.
  92. Hall, David R.; Leany, Francis E.; Fox, Joe; Wilde, Tyson J., Jack element for a drill bit.
  93. Hall, David R.; Leany, Francis E.; Fox, Joe; Wilde, Tyson J., Jack element for a drill bit.
  94. Hall,David R.; Wilde,Tyson J.; Miskin,Ben, Jack element in communication with an electric motor and or generator.
  95. Hall, David R.; Wilde, Tyson J., Jet arrangement for a downhole drill bit.
  96. Cruickshank, Brian; Mahajan, Manoj; Makkar, Navish; Bhoite, Sameer; Dewey, Charles, Jet arrangement on an expandable downhole tool.
  97. Kembaiyan,Kumar T.; Keshavan,Madapusi K.; White,Alysia C.; White,Brian A., Layered hardfacing, durable hardfacing for drill bits.
  98. Hall, David R., Layered polycrystalline diamond.
  99. Hall, David R., Layered polycrystalline diamond.
  100. Hall, David R.; Wahlquist, David, Lead the bit rotary steerable system.
  101. Hall, David R.; Turner, Paula; Lundgreen, David; Woolston, Scott, Lead the bit rotary steerable tool.
  102. Hall, David R.; Turner, Paula; Lundgreen, David; Woolston, Scott, Lead the bit rotary steerable tool.
  103. Beaton, Timothy P.; Young, Thomas L.; Truax, David K., Method for drilling a wellbore using a bi-center drill bit.
  104. Hall, David R.; Crockett, Ronald B.; Skeem, Marcus; Leany, Francis; Webb, Casey, Method for drilling with a fixed bladed bit.
  105. Hall, David R.; Crockett, Ronald; Bailey, John, Method for manufacturing a drill bit.
  106. Fairman, Ruben E., Methods and systems for generating profile curves of solid models.
  107. Meiners, Matthew J.; Lund, Jeffrey B.; Harris, Thomas M., Methods for designing rotary drill bits exhibiting sequences of substantially continuously variable cutter backrake angles.
  108. Brackin, Van J.; Miller, Brian E.; George, Mathews, Methods of designing rotary drill bits including at least one substantially helically extending feature.
  109. Oesterberg, Marcus; Enterline, James D., Methods of forming earth-boring tools utilizing expandable reamer blades.
  110. Peters, Volker, Modular earth-boring tools, modules for such tools and related methods.
  111. Durairajan, Bala; Cariveau, Peter Thomas; Huang, Sujian J., PDC drill bit using optimized side rake angle.
  112. Cariveau, Peter Thomas; Durairajan, Bala; Huang, Sujian, PDC drill bit with cutter design optimized with dynamic centerline analysis having an angular separation in imbalance forces of 180 degrees for maximum time.
  113. Hall, David R.; Crockett, Ronald; Fox, Joe; Bailey, John, Percussive drill bit.
  114. Hall, David R.; Crockett, Ronald B.; Bailey, John, Pointed diamond working ends on a shear bit.
  115. Hall, David R.; Crockett, Ronald B.; Bailey, John D., Pointed working ends on a bit.
  116. Beaton,Timothy P., Polycrystaline diamond compact insert reaming tool.
  117. Beaton, Timothy P., Polycrystalline diamond compact insert reaming tool.
  118. Centala, Prabhakaran K.; Boudrare, Mohammed; Huang, Sujian, Radial force distributions in rock bits.
  119. Christopher S. Charles ; William Gregory Presley ; Sean K. Berzas ; Douglas J. Bobrosky ; Mark W. Dykstra ; Mark E. Morris ; David M. Schnell ; L. Allen Sinor, Reaming apparatus and method with ability to drill out cement and float equipment in casing.
  120. Presley, W. Gregory; Charles, Christopher S.; Radford, Steven R.; Meiners, Matthew J.; Morris, Mark E.; Clinkscales, D. Jay; Lund, Jeffrey B.; Laing, Robert A.; Mumma, Matthew D., Reaming apparatus and method with enhanced structural protection.
  121. Radford, Steven R.; Trinh, Khoi Q.; Habernal, Jason R.; Glasgow, Jr., R. Keith; Evans, John G.; Stauffer, Bruce; Witte, Johannes, Remotely controlled apparatus for downhole applications and methods of operation.
  122. Radford, Steven R.; Trinh, Khoi Q.; Habernal, Jason R.; Glasgow, R. Keith; Evans, John G.; Stauffer, Bruce; Witte, Johannes, Remotely controlled apparatus for downhole applications and methods of operation.
  123. Radford, Steven R.; Jurica, Chad T.; Li, Li; Miller, Timothy; Oesterberg, Marcus; Trinh, Khoi Q., Remotely controlled apparatus for downhole applications, components for such apparatus, remote status indication devices for such apparatus, and related methods.
  124. Radford, Steven R.; Kidder, Kevin G., Restriction element trap for use with an actuation element of a downhole apparatus and method of use.
  125. Hall, David R.; Crockett, Ronald B.; Gerla, Andrew, Roof bolt bit.
  126. Hall, David R.; Crockett, Ronald, Roof mining drill bit.
  127. Hall, David R.; Crockett, Ronald B.; Bailey, John, Rotary drag bit with pointed cutting elements.
  128. Chen, Shilin; Ashlie, Riun, Rotary drill bit with improved steerability and reduced wear.
  129. Meiners, Matthew J.; Lund, Jeffrey B.; Harris, Thomas M., Rotary drill bits exhibiting sequences of substantially continuously variable cutter backrake angles.
  130. Dykstra Mark W. ; Norris James A. ; Beuershausen Christopher C. ; Pessier Rudolf C. O., Rotary drill bits for directional drilling employing movable cutters and tandem gage pad arrangement with active cutting elements and having up-drill capability.
  131. Beuershausen Christopher C. ; Costo ; Jr. Robert J. ; Scott Danny E. ; Pessier Rudolf C. O., Rotary drill bits for directional drilling employing tandem gage pad arrangement with cutting elements and up-drill capability.
  132. Beuershausen Christopher C. ; Costo ; Jr. Robert J. ; Scott Danny E. ; Pessier Rudolf C. O. ; Illerhaus Roland ; Dykstra Mark W. ; Norris James A. ; Ohanian Michael P. ; Spaar John R., Rotary drill bits for directional drilling employing tandem gage pad arrangement with cutting elements and up-drill capability.
  133. Brackin,Van J.; Miller,Brian E.; George,Mathews, Rotary drill bits including at least one substantially helically extending feature and methods of operation.
  134. Hall,David R.; Wahlquist,David, Rotary valve for a jack hammer.
  135. Dewey,Charles H.; Xu,Wei, Selectively actuatable expandable underreamer/stablizer.
  136. Radford, Steven R.; Oesterberg, Marcus; Gentry, S. Richard, Selectively actuating expandable reamers and related methods.
  137. Radford, Steven R.; Oesterberg, Marcus; Gentry, S. Richard, Selectively actuating expandable reamers and related methods.
  138. Hall, David R.; Shumway, Jim; Wahlquist, David, Sensor for determining a position of a jack element.
  139. Hall, David R.; Leany, Francis; Woolston, Scott; Manwill, Daniel, Sensor on a formation engaging member of a drill bit.
  140. Hall, David R.; Leany, Francis; Woolston, Scott; Manwill, Daniel, Sensor on a formation engaging member of a drill bit.
  141. Raney, Richard C., Stabilizing system and methods for a drill bit.
  142. Radford, Steven R.; Trinh, Khoi Q., Status indicators for use in earth-boring tools having expandable members and methods of making and using such status indicators and earth-boring tools.
  143. Sved, John B., Steerable horizontal subterranean drill bit.
  144. Sved, John B., Steerable horizontal subterranean drill bit having a one bolt attachment system.
  145. Sved, John B., Steerable horizontal subterranean drill bit having an offset drilling fluid seal.
  146. Sved, John B., Steerable horizontal subterranean drill bit having elevated wear protector receptacles.
  147. Sved, John B., Steerable horizontal subterranean drill bit having offset cutting tooth paths.
  148. Underwood, Lance D.; Dewey, Charles H., Steerable underreamer/stabilizer assembly and method.
  149. Hall, David R.; Marshall, Jonathan; Dahlgren, Scott S., Steering mechanism with a ring disposed about an outer diameter of a drill bit and method for drilling.
  150. Hall, David R.; Shumway, Jim, System for steering a drill string.
  151. Hall, David R.; Crockett, Ronald B.; Fox, Joe, Thermally stable pointed diamond with increased impact resistance.
  152. Hall, David R.; Marshall, Jonathan; Dahlgren, Scott, Timed steering nozzle on a downhole drill bit.
  153. Radford, Steven R.; Trinh, Khoi Q.; Gentry, S. Richard, Tools for use in subterranean boreholes having expandable members and related methods.
  154. Hall, David R.; Crockett, Ronald B.; Skeem, Marcus; Leany, Francis; Webb, Casey, Tracking shearing cutters on a fixed bladed drill bit with pointed cutting elements.
  155. Hall, David R.; Crockett, Ronald B.; Skeem, Marcus; Leany, Francis; Webb, Casey, Tracking shearing cutters on a fixed bladed drill bit with pointed cutting elements.
  156. Hall, David R.; Dahlgren, Scott; Marshall, Jonathan, Turbine driven hammer that oscillates at a constant frequency.
  157. Da Silva, Nuno; Dupont, Olivier; Mageren, Olivier, Unbalance force identifiers and balancing methods for drilling equipment assemblies.
  158. Oesterberg, Marcus; Enterline, James D., Utilization of expandable reamer blades in rigid earth-boring tool bodies.
  159. Herberg, Wolfgang E.; Gruetzmann, Ines, Wellbore tool with exchangeable blades.
섹션별 컨텐츠 바로가기

AI-Helper ※ AI-Helper는 오픈소스 모델을 사용합니다.

AI-Helper 아이콘
AI-Helper
안녕하세요, AI-Helper입니다. 좌측 "선택된 텍스트"에서 텍스트를 선택하여 요약, 번역, 용어설명을 실행하세요.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.

선택된 텍스트

맨위로