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Dual String Exit Module

IP.com Disclosure Number: IPCOM000247871D
Publication Date: 2016-Oct-07
Document File: 2 page(s) / 14K

Publishing Venue

The IP.com Prior Art Database

Abstract

A module run on production tubing to aid in subsequent casing exits via coiled tubing drilling and/or standard rotary drilling. Consists of a solid medium either wrapped, molded, or deployed in a housing around the production tubing that will minimize the annular space between the production tubing and the liner or casing while providing the ability to perform a casing exit anywhere within the module by utilizing a monobore whipstock.

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Dual String Exit Module

     A module run on production tubing to aid in subsequent casing exits via coiled tubing drilling and/or standard rotary drilling. Consists of a solid medium either wrapped, molded, or deployed in a housing around the production tubing that will minimize the annular space between the production tubing and the liner or casing while providing the ability to perform a casing exit anywhere within the module by utilizing a monobore whipstock.

     The Dual String Exit Module (DSEM) will be utilized when new production tubing is ran into a well that has been pre-determined for a casing exit, primarily by way of Coiled Tubing Drilling (CTD). The DSEM will provide a solid medium to 1) support the milling BHA while performing the dual string casing exit and 2) aid in centralizing the production tubing inside the liner/casing to prevent deflection of the production tubing during the window milling process. These two benefits will greatly decrease the chance of the casing exit tracking down the annulus, resulting in a failed casing exit. The DSEM will consist of standard production tubing and a solid medium that is either wrapped or molded directly to the production tubing. The OD will be such that it is able to drift the wells current liner or casing drift ID. The ideal length of said module would be approximately 30' or the entire length of a joint of production tubing. By utilizing the entire length of the tubing joint, a casing exit can then be performed anywhere throughout the module and/or have the ability to perform multiple casing exits within a single module depending on application and deployment. The DSEM will utilize a solid medium that is easier to mill through than the tubing/ casing but provide support for the mill. The DSEM will first be run on the standard production tubing during workover operations. It will be run down to a predetermined depth, decided by geological preference, and the production packer will be set and the production tubing hung off at surface. At this point, the depth of DSEM will be permanent unless the production string is again pulled. Prior to CTD operations, setting depths for the whipstock will be determined and the whipstock can then be set via E-line if the customer so desires. Again, the DSEM will allow for multiple setting locations within the entirety of the module if the need arises. When the CTD rig begins milling operations, the milling bottom hole assembly (BHA) will begin milling through the production tubing. As the mill exits the production tubing, the solid medium material, will assist in continuing along the desired window path as the mill makes progress towards the casing/liner. Once the mill contacts the casing/liner, the medium will again assist in supporting the milling BHA by allowing a proper pattern to be started on the casing/liner. Once this pattern is started, the milling BHA will continue forward and exit the casing/liner and exit into the formation. At this...