fax 01-972-952-9435. AbstractSuccessful Dual Casing Exits are becoming more commonplace in today's oil field. However, there are still many challenges involved with this type of work. This paper will outline the successful completion of a two well campaign carried out in the Arabian Gulf along with the problems encountered, lessons learned, the post job conclusions and the recommended way forward for future jobs.The task for this campaign was to design, build and supply a system that would be able to set inside 4 ½" casing and successfully mill a window out of this smaller pipe into the surrounding cement then mill out through the larger 9 5/8" casing. Having milled the window through both sizes of casing, a rat hole would have to be drilled deep enough to suit the subsequent drill ahead BHA. Although these window milling BHA's were to be conveyed using pipe, like traditional TTRD exits, this campaign would utilize PDM motors to provide the rotation for sidetracking the wells.On both occasions, the sidetracks were completed and the customer was able to continue the drill ahead operations as planned. There were many lessons learned throughout the campaign. From the initial design stages, through the manufacturing phase and finally onto the operational issues, the lessons learned were significant and will be used in the future advancement for this type of work.This technical paper will show the importance of this campaign which, with the lessons learned, will lead to many more successful dual casing exits being carried out.
TX 75083-3836 U.S.A., fax 01-972-952-9435. AbstractHistorically, in CT/TT application, sidetracking through the casing requires multiple trips to effectively produce a useable window for the next directional drilling assembly. The number of trips needed depends upon the performance of the window milling system and the comfort level of the system operator.This paper presents an innovative one trip casing exit system especially tailored for the CT/TT operation. The system includes a hydraulically set anchor which can pass through a restriction and expands to a larger diameter, a whipstock, that incorporates a hydraulically activated hinge mechanism, which provides the optimum trajectory for the mill with multiple ramps for strategically guiding the milling tool, a lead mill with tightly spiraled blades dressed with cylindrical inserts for aggressive milling action and a retrieval tool in case the system is to be recovered. The paper will also present a detail description of validation surface test equipment for a 4 1 / 2 " X 7" TT system, test procedure and test results. The test set up included a 90 ft. long 'I' beam test bed, triplex pumping unit, data acquisition system and video camera for recording the milled window profile and rat hole conditions.The initial test objectives were (1) to functionally test the anchor and hinge mechanism; (2) test the TT Whipstock system inside a test fixture and successfully mill a window;(3) evaluate various mill configurations utilizing the TT Whipstock system.
fax 01-972-952-9435. AbstractSuccessful Dual Casing Exits are becoming more commonplace in today's oil field. However, there are still many challenges involved with this type of work. This paper will outline the successful completion of a two well campaign carried out in the Arabian Gulf along with the problems encountered, lessons learned, the post job conclusions and the recommended way forward for future jobs.The task for this campaign was to design, build and supply a system that would be able to set inside 4 ½" casing and successfully mill a window out of this smaller pipe into the surrounding cement then mill out through the larger 9 5/8" casing. Having milled the window through both sizes of casing, a rat hole would have to be drilled deep enough to suit the subsequent drill ahead BHA. Although these window milling BHA's were to be conveyed using pipe, like traditional TTRD exits, this campaign would utilize PDM motors to provide the rotation for sidetracking the wells.On both occasions, the sidetracks were completed and the customer was able to continue the drill ahead operations as planned. There were many lessons learned throughout the campaign. From the initial design stages, through the manufacturing phase and finally onto the operational issues, the lessons learned were significant and will be used in the future advancement for this type of work.This technical paper will show the importance of this campaign which, with the lessons learned, will lead to many more successful dual casing exits being carried out.
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