| Title of Invention | " AN IMPROVED DRUM SHAFT OF A ROTATING DRUM OF AN OIL RIG " |
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| Abstract | This invention relates to an improved drum shaft bush extension to enhance draw work"s drum shaft in oil rig comprising: a stainless steel bush (1) inserted into the hollow bore (4) of a drum shaft (2) on drilling the opening end of the shaft matching with outside diameter of the bush (1) and adapted with the shaft by threading (6); welding at the open face (3) of the shaft in the threading between the matching inner surface of the drum shaft and outside surface of the bush (1) thus providing a secured leak proof attachment for connectivity of the drum shaft with related jointed connecting parts of a rig while in operation. |
| Full Text | -2- FIELD OF THE INVENTION The subject invention relates to development of an improved drum shaft bush extension to enhance the life of draw work's drum shaft in oil rig. BACKGROUND OF THE INVENTION An oil rig used for drilling wells for exploration or production of oil essentially contains the following equipment: 1. Mast and substructure: which provides the basic support for the equipment used for drilling and handling of various tools. 2. Hoisting and rotating equipment: These are equipment like the hoist also known as the draw works, rotary, swivel and traveling block. The draw works are used for the following activities. a) Raising and lowering of mast and substructure during every rig building and rig move. -3- b) Provide required rotating torque to the drill bit through the rotary table and Kelly. c) Raising and lowering of drill pipes using the traveling block in the process of drilling and tripping operations. d) Miscellaneous activities like torque lighting of drill pipe, breaking of the pipe points. Fishing, surveying the drilled hole using various instruments. The drum shaft plays a key role in all of the above functions. The rotating speed of the drum shaft is controlled by the main brake mounted on the drum shaft itself. The braking activity is continuous during the operation of the oil rig. Large amount of heat is generated due to the frictional force and needs to be dissipated. The brake flange used for this purpose has an integral water jacket (chamber) through which oil circulation is facilitated. The supply of cooling water required is provided through the hollow passage of the main drum shaft upto the length where the brake flange is mounted. -4- Connectivity is provided by means of pipes and hoses with 100 % leak proof joints. In existing design, the drum shaft is provided with a groove for the 'O' ring which prevents passing of water in the joined plane. Over a period of time, 'O' ring groove gets damaged due to corrosion. The said damage is due to the fact that the water used for cooling at rig sites is often of very poor quality and is drawn from available ground sources near by. In the process of continuous operation the 'O' ring groove gets damaged leading to water seepage initially and consequently result heavy leakage. The water thus leaked mixes with the oil which is flowing through another passage for lubricating the chains and sprockets of the draw works. As a consequence this drum shaft needs regular replacement of the damaged 'O' ring groove due to corrosion, thus resulting both expensive and time consuming procedure. The present invention has proposed to overcome the above difficulties of prior state of art by employment of stainless steel bush inserted into bored shaft instead of maintaining groove for the 'O' ring to prevent leakage of water in the jointed plane. -5- No prior patent document was noticed in respect of such development of the present invention. DESCRIPTION OF THE INVENTION One objective of the invention is to avoid such replacement of costly drum shaft and save time consuming activity in such replacement and optimize run of the drum shaft. The said objective is carried through on employment of shaft bush extension instead of the 'O' ring groove configuration of the drum shaft. The proposed invention will be better understood from the following description with reference to the accompanying drawings in which Figure 1 represents a sectional elevation view of the drum shaft with SS bush. -6- Figure 2 represents plan view of the drum shaft fixed with SS bush. Figure 3 represents isolated view of the drum shaft with SS bush with thread design. In the Figures a hole (4) is a through hole bored in the drum shaft (2). A stainless steel (SS) bush (1) with corresponding dimension is inserted into the hollow bore (4) and adapted with the shaft (2) by threading (6) on drilling the opening end of the shaft matching with outside diameter of the bush (1) and thereafter welded all round at point (3) by Tungsten Inert Gas (TIG) welding at the open face of the shaft. The whole setup of the drum shaft with the SS bush is fastened through several keys (5) around the bored hole of the drum shaft. Figure 3 in exploded view show how the said SS bush (1) is provided in the bored hole of the drum shaft (2) with threading (6) with detailed manner of attachment of the SS bush extension for connectivity with main brake and related connections with pipes and hoses. The weld around the bush is made at the open end portion of the threading (3) at the open end surface of the shaft on which surface the bush (1) is adapted and extended beyond the said open surface for connectivity. -7- Such adaptation of the SS bush extension shaft provide secured leak proof joints of the drum shaft of an oil rig in operation with enhanced life of the drum shaft. The scope and ambit of the invention as narrated herein is defined in the encompassed appended claims. -8- WE CLAIM 1. An improved drum shaft bush extension to enhance the life of draw work's drum shaft in oil rig comprising: a stainless steel bush (1) inserted into the hollow bore (4) of a drum shaft (2) on drilling the opening end of the shaft matching with outside diameter of the bush (1) and adapted with the shaft by threading (6); welding at the open face (3) of the shaft in the threading between the matching inner surface of the drum shaft and outside surface of the bush (1) thus providing a secured leak proof attachment for connectivity of the drum shaft with related jointed connecting parts of a rig while in operation. 2. A drum shaft bush extension as claimed in claim 1, wherein the bush (1) thread fitted and welded has extended portion for connection with connecting parts. -9- 3. A drum shaft bush extension as claimed in claim 1 wherein the bush extension is fastened with the drum shaft by fastening means (5). Dated this 28th day of September 2007. This invention relates to an improved drum shaft bush extension to enhance draw work's drum shaft in oil rig comprising: a stainless steel bush (1) inserted into the hollow bore (4) of a drum shaft (2) on drilling the opening end of the shaft matching with outside diameter of the bush (1) and adapted with the shaft by threading (6); welding at the open face (3) of the shaft in the threading between the matching inner surface of the drum shaft and outside surface of the bush (1) thus providing a secured leak proof attachment for connectivity of the drum shaft with related jointed connecting parts of a rig while in operation. |
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01344-kol-2007-correspondence others 1.1.pdf
01344-kol-2007-correspondence others.pdf
01344-kol-2007-description complete.pdf
1344-KOL-2007-(18-04-2012)-ABSTRACT.pdf
1344-KOL-2007-(18-04-2012)-AMANDED CLAIMS.pdf
1344-KOL-2007-(18-04-2012)-DESCRIPTION (COMPLETE).pdf
1344-KOL-2007-(18-04-2012)-DRAWINGS.pdf
1344-KOL-2007-(18-04-2012)-EXAMINATION REPORT REPLY RECEIVED.pdf
1344-KOL-2007-(18-04-2012)-FORM-1.pdf
1344-KOL-2007-(18-04-2012)-FORM-2.pdf
1344-KOL-2007-(18-04-2012)-OTHERS.pdf
1344-KOL-2007-(18-04-2012)-PA.pdf
1344-KOL-2007-CORRESPONDENCE 1.1.pdf
1344-KOL-2007-CORRESPONDENCE 1.2.pdf
1344-KOL-2007-EXAMINATION REPORT.pdf
1344-KOL-2007-GRANTED-ABSTRACT.pdf
1344-KOL-2007-GRANTED-CLAIMS.pdf
1344-KOL-2007-GRANTED-DESCRIPTION (COMPLETE).pdf
1344-KOL-2007-GRANTED-DRAWINGS.pdf
1344-KOL-2007-GRANTED-FORM 1.pdf
1344-KOL-2007-GRANTED-FORM 2.pdf
1344-KOL-2007-GRANTED-LETTER PATENT.pdf
1344-KOL-2007-GRANTED-SPECIFICATION.pdf
1344-KOL-2007-REPLY TO EXAMINATION REPORT.pdf
| Patent Number | 253375 | |||||||||
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| Indian Patent Application Number | 1344/KOL/2007 | |||||||||
| PG Journal Number | 29/2012 | |||||||||
| Publication Date | 20-Jul-2012 | |||||||||
| Grant Date | 16-Jul-2012 | |||||||||
| Date of Filing | 28-Sep-2007 | |||||||||
| Name of Patentee | BHARAT HEAVY ELECTRICALS LIMITED | |||||||||
| Applicant Address | REGIONAL OPERATIONS DIVISION (ROD), PLOT NO: 9/1, DJBLOCK 3RD FLOOR, KARUNAMOYEE, SALT LAKE CITY, KOLKATA-700091, HAVING ITS REGISTERED OFFICE AT BHEL HOUSE, SIRI FORT, NEW DELHI - 110049 | |||||||||
Inventors:
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| PCT International Classification Number | E21B3/06 | |||||||||
| PCT International Application Number | N/A | |||||||||
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