Intermediate drill stem |
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| 申请号 | US3773359D | 申请日 | 1971-06-24 | 公开(公告)号 | US3773359A | 公开(公告)日 | 1973-11-20 |
| 申请人 | SMITH INTERNATIONAL; | 发明人 | CHANCE G; CREWS S; WILSON C; | ||||
| 摘要 | Intermediate drill stem includes an alloy steel body of smaller inner diameter than usual for drill pipe and machined to drill pipe outer diameter except having one or more integral protectors of larger outer diameter at intervals along its length and except further having integral transition portions of somewhat larger than drill pipe outer diameter near its ends and portions of elevator shoulders at the ends, the ends also being built up externally and internally with weld metal to match the wall thickness of extra long alloy steel connector members rod welded to the ends of the body. Typically the body of the intermediate drill stem is made from a worn out drill collar. If the ends of the old collar are not too far gone the original integral drill collar connectors can be used instead of welding on connector members. New material may be used for the body and if anticipated loading is not too great carbon steel could be used instead of alloy steel. In any case, the integral protectors could be omitted. However, if a radially integral protector is used, intermediate stem can be made from a plurality of lengths of material welded together at the thick wall area of the protector. | ||||||
| 权利要求 | 2. Subject matter of claim 1, including hard facing around said protector. 3. Subject matter of claim 1, including hard facing around each of said butts. 4. Subject matter of claim 1, each of said butts having a ratio of length to outer diameter of at least about three to one. 5. Subject matter of claim 1, said protector having a length of about 4 feet, said added weld metal lying at the mid portion of said protector. 6. Subject matter of claim 1, each of said pieces of metal having a protector part homogeneously integral therewith disposed between said butt and said end thereof, said protector part having a larger outer diameter than the main portion of said body. 7. Subject matter of claim 1, said intermediate stem being of Range III length, i.e. about 40 to 50 feet long. 8. Subject matter of claim 7, said intermediate stem having an inner diameter characteristic of a drill collar and an outer diameter characteristic of drill pipe. 9. An intermediate drill stem comprising an elongated, tubular, steel body the main portion of which has a substantially uniform outer diameter, said body having a wall thickness of at least about five-eighths inch in the main portion thereof, a tubular alloy steel connector connected to each end of said body, one of said connectors being interiorly threaded at its end opposite from its end that is connected to said body, said interiorly threaded end providing a box at one extremity of the stem, the other of said connectors having a portion of reduced outer diameter at its end opposite from its end that is connected to said body, said portion of reduced outer diameter being threaded to provide a pin at the outer extremity of the stem, the maximum outer diameter portion of each of said connectors being at least 1.2 times that of said main portion of the body whereby the rigidity of a connection comprising such pin and box connectors can be twice that of the main portion of the body of the stem, said connectors being long axially compared to the diameter thereof, the combined length of the maximum diameter portions of the pin and box connectors being at least four times the outer diameter of said maximum diameter portions, the outer surface of said main portion of said body being a turned machined surface, said body having ends of larger outer diameter than that of said main portion of the body, each connector being welded to one of said ends, said body having at least one portion located between and spaced from the ends of the body which one portion has a larger outer diameter than said main portion of the body, said portion of larger outer diameter providing a protector against wear on the main portion of the body, each said protector being homogeneously integral with said main portion of the body, said protector and main portion being one and the same single piece of metal, each of said protector having an outer diameter at least one-half inch larger than the outer diameter of the main portion of the body of the stem, the length of each protector being at least twice the outer diameter of the connectors, said long connectors and each said protector being spaced apart along the length of the stem and serving as centralizers for said intermediate stem, two additional protectors each homogeneously integral with said body and of larger other diameter than said main portion of the body, the three said protectors being spaced apart along the length of said intermediate stem, each of said protectors having a length of at least about three times the outer diameter of the maximum outer diameter portions of the connectors. |
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