IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0105867
(2013-12-13)
|
등록번호 |
US-9416593
(2016-08-16)
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발명자
/ 주소 |
- Gan, Xiaoge
- Bhatia, Lokesh
- Harrington, Kevin E.
- Slaughter, Jr., Robert H.
|
출원인 / 주소 |
- Smith International, Inc.
|
인용정보 |
피인용 횟수 :
0 인용 특허 :
21 |
초록
▼
A percussion drilling assembly includes a housing with a hammer bit disposed in the lower end portion thereof and configured to move longitudinally within the housing. The hammer bit includes an annular bit shank having a bit strike face and a cutting structure at a lower end portion thereof. An ann
A percussion drilling assembly includes a housing with a hammer bit disposed in the lower end portion thereof and configured to move longitudinally within the housing. The hammer bit includes an annular bit shank having a bit strike face and a cutting structure at a lower end portion thereof. An annular piston having a piston strike face arranged and designed to strike the bit strike face is also disposed in the housing. At least one of the bit strike face and the piston strike face has a toroidal curvature profile. A method includes one or more of lowering the percussion drilling assembly into a borehole, engaging the cutting structure with a formation, and impacting the bit strike face of the annular bit shank with the piston strike face of the annular piston.
대표청구항
▼
1. A percussion drilling assembly, comprising: a housing capable of being coupled to a drill string;a hammer bit coupled to a lower end portion of the housing and configured to move longitudinally relative to the housing, the hammer bit including an annular bit shank having a bit strike face at an u
1. A percussion drilling assembly, comprising: a housing capable of being coupled to a drill string;a hammer bit coupled to a lower end portion of the housing and configured to move longitudinally relative to the housing, the hammer bit including an annular bit shank having a bit strike face at an upper end portion thereof and a cutting structure at a lower end portion thereof; andan annular piston coupled to the housing, the annular piston having a piston strike face at a lower end portion thereof arranged and designed to strike the bit strike face, at least one of the bit strike face or the piston strike face having a convex toroidal curvature profile with a convex portion configured to strike a flat or convex portion of a flat or convex toroidal curvature profile of the other of the bit strike face or the piston strike face. 2. The percussion drilling assembly of claim 1, a radial cross-section of the toroidal curvature profile forming a circular arc. 3. The percussion drilling assembly of claim 2, the circular arc defining a radius of curvature between 0.5 inch and 150 inches. 4. The percussion drilling assembly of claim 1, a radial cross-section of the toroidal curvature profile forming an elliptical arc. 5. The percussion drilling assembly of claim 4, a longitudinal width of the elliptical arc defining a height of the toroidal curvature profile, the height of the toroidal curvature profile being between 0.0005 inch and 0.4 inch. 6. The percussion drilling assembly of claim 1, a radial cross-section of the toroidal curvature profile forming a curve having at least two arc segments. 7. A method of making a percussion drilling assembly, comprising: disposing a longitudinally movable annular piston at least partially in a housing having a lower end portion and an upper end portion, the upper end portion of the housing configured to couple to a drill string, the longitudinally movable annular piston having a piston strike face around a piston central passage at a lower end portion thereof, the longitudinally movable annular piston further having an inner piston surface defining the piston central passage and having an outer piston surface; anddisposing a hammer bit at least partially in the housing lower than the longitudinally movable annular piston, the hammer bit having an annular bit shank with a bit strike face around a bit central passage at an upper end portion thereof, and a cutting structure at a lower end thereof, the hammer bit including an inner bit surface defining the bit central passage and includes an outer bit surface, the bit strike face being positioned opposite the piston strike face, and at least one of the following: a toroidal curvature profile on the piston strike face, the toroidal curvature profile of the piston strike face having a greater height at a center-point between the inner and outer piston surfaces than at the inner and outer piston surfaces; ora toroidal curvature profile on the bit strike face, the toroidal curvature profile of the bit strike face having a greater height at a center-point between the inner and outer bit surfaces than at the inner and outer bit surfaces. 8. The method of claim 7, the bit strike face having a convex toroidal curvature profile. 9. The method of claim 7, the piston strike face having a convex toroidal curvature profile. 10. The method of claim 7, a radial cross-section of the toroidal curvature profile forming a circular arc. 11. The method of claim 7, a radial cross-section of the toroidal curvature profile forming an elliptical arc. 12. The method of claim 7, further comprising: selecting the toroidal curvature profile to redistribute impact stress and prevent plastic deformation in one or more of the annular piston or the annular bit shank. 13. The method of claim 12, further comprising: selecting the toroidal curvature profile to minimize wash off. 14. A method of drilling with a percussion drilling assembly, comprising: extending a percussion drilling assembly into a borehole, the percussion drilling assembly including: a housing with a lower end portion and an upper end portion, the upper end portion capable of being coupled to a drill string;a hammer bit at least partially within the lower end portion of the housing and configured to move longitudinally relative to the housing, the hammer bit having an annular bit shank with a bit strike face at an upper end portion of the annular bit shank, the bit strike face extending around a bit central passage, and the hammer bit including a cutting structure at a lower end portion of the annular bit shank; andan annular piston at least partially within the housing, the annular piston having a piston strike face at a lower end portion thereof, the piston strike face extending around a piston central passage, the piston strike face being arranged and designed to strike the bit strike face, wherein at least one of the piston strike face or bit strike face has a toroidal curvature profile in which: for the piston strike face, the toroidal curvature profile has a greater height at a radial position between the inner and outer piston surfaces than at the inner and outer piston surfaces; andfor the bit strike face, the toroidal curvature profile has a greater height at a center-point of a wall around the bit central passage than at inner and outer bit surfaces;engaging the cutting structure with a formation; andcausing the bit strike face to impact the piston strike face. 15. The method of claim 14, the piston strike face having a convex toroidal curvature profile. 16. The method of claim 15, the bit strike face having a convex or flat toroidal curvature profile. 17. The method of claim 14, the bit strike face having a convex toroidal curvature profile. 18. The method of claim 17, the piston strike face having a convex or flat toroidal curvature profile.
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