Well commissioning operations offshore encounter multiple organizational, operational and technical challenges that must be safely overcome to efficiently deliver high-quality service. Coiled tubing (CT) perforation and commissioning performed in hostile reservoir conditions and high pressure is one of the most complicated multiservice operations, especially in a sensitive aquifer ecosystem like the shallow Caspian basin. A comprehensive approach used to deploy an innovative solution to the challenges provided experience in such operations and lessons learned. An innovative perforation technique was selected for the project: electric-line-enabled CT for precise depth control in combination with an advanced gun deployment system for conveyance of long gun strings under pressure. New techniques were incorporated to improve equipment efficiency and reliability: detonation shock-resistant bottomhole assembly, two independent emergency disconnects, software to predict and evaluate shock load and dynamic underbalance, high-pressure H2S-rated and conventional connectors for a specialized tool deployment stack (TDS), rounded scallop guns, and high-tensile CT logging-head-disconnect weak points. To date, more than 10 well commissioning operations were successfully completed with this innovative method. Integrated service project management was a key approach to achieving successful results by effectively integrating multiple service lines. The technique proved to effectively minimize operational time, associated risks, improper equipment use, and interface failures between different service lines. The developed solution is a seamless integration of electric-line-enabled CT, the CT logging head, the gun deployment system for pressurized well conditions, and a set of wireline tools and specialized perforation equipment. The design was optimized to perforate the well in three or four runs at overbalanced condition (squeeze mode) in one rig-up job instead of the more than 20 wireline runs typical in conventional operations. Additionally, the use of CT provided the flexibility to perform pumping operations for well displacement, injection of an H2S scavenger, and stimulation, as per the operator's plan, without or with only partial rig-down. This was the first time that integrated service project with the described CT perforation technique was performed in the Caspian region. The acquired experience will facilitate design, preparation, and execution stages for such type of jobs with multiple services involved.

Well completion and commissioning operations offshore present a variety of technical and operational challenges in the quest to maximize well productivity and optimize the economic value together with focus on safety. This is very relevant to the perforation operations performed in hostile and high-pressure reservoir conditions encountered in a complex development project in the Caspian basin. We provide description of the project and the innovative solution applied, including challenges faced, experience gained, and lessons learned. To overcome challenges, we selected electric-line-enabled (e-line-enabled) coiled tubing (CT) for precise depth control, and the latest advanced gun deployment system for conveyance of long gun strings under pressure. Innovative solutions implemented throughout the project included the perforation-shock-resistant bottomhole assembly (BHA), two independent emergency disconnects, and tuned software to predict and evaluate shock load and dynamic underbalance. Some of the unique technical solutions were designed specifically for this project: high-pressure and H2S-rated connectors; specialized tool deployment stack; 15,000-psi working pressure 5.12-in. ID H2S-rated rounded scallop guns; shock-resistant electrical disconnect; and high-tensile CT logging head disconnect weak points. To date, more than 10 well commissioning operations were successfully completed with this innovative method—e-line-enabled CT perforation under high pressure. This perforation technique proved to effectively minimize operational time, associated risks, improper equipment use, and footprint on location. Such approach allowed safe and efficient perforation in a controlled well environment that resulted in accurate depth control and managed detonation shock load and overbalanced conditions, which avoided any well fluid influx or H2S release. The developed solution required seamless integration of innovative techniques and hardware, including e-line enabled CT, the CT logging head, the gun deployment system for pressurized well conditions, wireline tools and specialized perforation equipment. The design was optimized to perforate the well in three or four runs at overbalanced condition (squeeze mode) in a single rig-up job instead of more than 20 wireline runs. Additionally, the use of CT granted flexibility and increased operational safety to perform pumping operations for well displacement and well control, injection of H2S scavenger, and stimulation, as per Operator's plan, without or with only partial rig-down. This is the first time that the described CT perforation operation using such techniques has been performed in the Caspian region. The experience demonstrates a method to safely and efficiently facilitate perforation jobs under challenging conditions in the future.

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Well completion and commissioning operations offshore present a variety of technical and operational challenges in the quest to maximize well productivity and optimize the economic value together with focus on safety. This is very relevant to perforation operations performed in hostile and high-pressure reservoir conditions encountered in a complex development project in the Caspian basin. The degree of complexity is increased due to required oriented perforation in a deviated intelligent completion well equipped with well monitoring system mounted on the outer side of the production liner. We describe the developed innovative technical solution for oriented perforation, challenges encountered, lessons learned, and results of this first-time-in-the-world implementation. To meet job objectives, we selected electric-line enabled (e-line enabled) coiled tubing (CT) for precise depth control, the latest-generation advanced gun deployment system (15,000-psi working pressure 5.12-in. ID H2S-rated) for conveyance of long gunstrings under pressure paired with specially developed hostile oriented gun system, and newly designed CT perforation string components, such as the perforation-shock-resistant bottomhole assembly (BHA), two independent emergency disconnects, high-tensile CT logging head disconnect weak points, perforation passive casing orienting device, and tuned software to predict and evaluate shock load and dynamic underbalance. The oriented perforation job was successfully completed with this innovative oriented method for perforation applications—passive casing orienting device for deviated wells. This perforation technique proved capable of providing desired orientation accuracy and effectively minimized operational time and associated risks. Such approach allowed safe and efficient perforation in a controlled well environment and provided perforation in the desired direction away from downhole well monitoring equipment and with accurate depth control, and managed detonation shock load in overbalanced conditions, which avoided any well fluid influx or H2S release. The developed solution is a seamless integration of e-line enabled CT, the CT logging head, a gun deployment system for pressurized well conditions, and a set of wireline tools and specialized perforation equipment for passive orientation. This is the first time that the described oriented CT perforation operation using such innovative techniques has been performed in the world. The experience demonstrates a method to safely and efficiently facilitate challenging oriented perforation jobs in the future for intelligent completion applications and a great opportunity for well performance evaluation through distributed temperature-sensing analysis.