The use of Coiled Tubing (CT) has been over the past years a preferred method to deploy long, heavy screens and guns in highly deviated wells in a single run without killing the well, therefore reducing the risk and improving job efficiency. Two case histories are presented in this paper. The first involves deployment of 88m of screens and the second deployment of 125m of 3-3/8-in guns including blank sections. After revising several techniques, the best approach was to use an Advance Live Well Deployment (ALWD) system to deploy and set the screens, and to deploy and retrieved guns, with a tubing encapsulated electrical wire which enabled the Coiled Tubing Telemetry (CTT) system with the ultimate goal to perform a safe and cost-saving well intervention, as compared to other options such as conventional wireline perforating. In the first job, the objective was to remove a plug to get access to the zones below and deploy/set 88m of ceramic screens in one run. In the second job, the objective was to set a plug in the tubing to isolate lower zones and run 125m of guns to perforate tubing and casing. Extensive job planning was done including CT simulations to reach target depth, shock modeling to confirm forces are within CT limitations, and yard tests to verify deployment (screens) and deployment/reverse deployment (guns) procedures. CTT system with a Tension Compression Torque (TCT) sensor was used during deployment/reverse-deployment operations. Casing Collar Locator (CCL) sensor was run for depth correlation during screen/guns positioning and packers setting (screens). Deployment Bottom Hole Assembly (BHA) was changed to a firing BHA before running in the hole for setting the packer and electrically activating the guns. With the ALWD system, 88m of ceramic screens were successfully run and set inside existing screens, as well as 125m of guns/blank sections were successfully deployed/reverse-deployed. Based on the success of these two case histories, the ALWD combined with CTT system has been proven to be the preferred method when dealing with long screens deployment and perforation intervals in live well conditions.
Objectives/Scope The goal for the project was to perforate a new high-pressure interval in live well conditions in one single run. Completion fluid was displaced to a lighter fluid, followed by gun deployment of 466 ft. to perforate a high-pressure gas interval. Methods, Procedures, Process It is understood that electric wireline, slick line and coiled tubing can be used to lubricate shorter intervals multiple times in and out of a well which is live. However, this can remove the advantages of dynamic underbalance and effective underbalanced perforating clean up. Operation was staged to prepare the wellbore for perforating, displacing the completion fluid from 1.7 SG CaBr2, to seawater, to 1.13 SG KCl brine. With the well ready for perforating, the use of the advanced live-well deployment system and intelligent coiled tubing BHA a 466ft long perforating assembly was conveyed to target depth in one run and successfully perforated the interval of interest in an underbalanced condition. Results, Observations, Conclusions The project efficiencies were maximized by taking an integrated approach to the overall project. By utilizing an Advanced Live Well deployment system, virtually any length of assembly can be safely deployed and recovered from a live well. Furthermore, by integrating this system with the Intelligent Coiled Tubing bottom hole assemblies for deployment and detonation, utilizing "rock optimized "perforating guns and Thru-Tubing Intervention systems, a complete solution can be provided for the operator. The application of the systems, resulted in a flawless execution, and a reduction in the operational risks associated with an operation that historically was classed as a high-risk project.
Over the past years the usage of coiled tubing as a prefer method to deploy long and heavy guns in highly deviated wells has been widely spread in the oil industry to provide a single run without killing the well, perforate in underbalance conditions, reduce risks and improve job efficiency. The three wells are located in the Caspian Sea. In two wells, the objective was to isolate lower intervals and perforate a new zone through tubing and casing between two packers. On the other well, the objective was to perforate a new interval through casing after running a new completion and isolate lower production zones. Due to the challenges involving gross length of the new intervals, guns size, well deviation and live deployment needs several techniques were evaluated. The best approach was to use an Advance Live-Well Deployment (ALWD) system to deploy and retrieve the guns with a tube wire-enabled Coiled Tubing Telemetry (CTT) system focus on both safety and cost saving compare with conventional wireline perforating. Extensive job planning involved coiled tubing (CT) simulations to reach target depths, shock loading modeling to ensure forces are within CT string limitations, system integration test to verify deployment/reverse technique procedure and system communication to electrically activate guns. CTT integrated sensor assembly was used during deployment/reverse operation with a tension, compression and torque (TCT) sub-assembly to monitor accurate upward/downward forces. In addition, CTT logging adapter assembly was used for depth correlation and electrical guns activation. The ALWD system; composed by connectors and deployment blow out preventor (BOP), prove to be an efficient way to run, perforate and retrieve gross intervals of 212 m, 246 m and 104 m with guns successfully. During all these jobs several lessons learnt were created in order to improve the deployment/reverse procedure for future jobs including not only operational steps but also deployment/reverse bottom-hole assembly (BHA) configurations. Based on the success of these case histories, the ALWD combined with CTT system has been proven to be the preferred method when dealing with long perforation intervals in life well conditions, thru-tubing environment.
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