Over the past several years the coiled tubing industry has seen significant coiled tubing-related technology advancements that have supported new applications for smaller coiled tubing (CT) services, from basic onshore capillary chemical injection installations to more complex offshore CT applications 1-8 . New and older well completion and location challenges continuously redefine the boundaries of conventional CT well intervention methods especially for offshore situations which can often be difficult to economically justify. These challenges require solutions that yield better economics. Small CT technologies have recently been developed and deployed on challenging projects in Asia Pacific to provide operators with cost effective methods to maintain wellbore integrity and enhance production.A lightweight, small-footprint coiled tubing unit (CTU) has been developed in Asia allowing for the use of Small CT technology on a broad spectrum of well service applicationsThis OTC paper will cover the specifics of an application of Small CT technology in Malaysia. Numerous challenges will be reviewed including using small (1-in. OD) CT pipe, small CT motors and working inside a restricted completion with high dogleg severity and a 70 degree hole angle. A total of 23 CT runs, inclusive of 14 CT perforation runs, were performed and the entire job was completed safely, without any major operational issues and delivered a gas rate of 15 MMscfpd.The Small CT equipment package is very comparable to a more conventional, larger CTU spread. A Small CT package can consist of a lightweight and small-footprint CT unit, a small nitrogen unit, reduced-size nitrogen tanks and compact pressure pumping equipment. As an example, for a gaslift type job using Small CT versus conventional CT equipment, the equipment footprint is reduced by 40% and the equipment weight is reduced by 46%. The small footprint and light weight of the Small CTU is especially beneficial where crane or deck space limitations are challenges. Small CT equipment can be customdesigned to suit most land or offshore applications, and the CT pipe can be installed on a semi-permanent basis (such as small capillary installations) or deployed as a work-string for well intervention programs.Application of this technology has the potential to substantially reduce operating costs, logistical support and risk exposure and can be applied to both onshore and offshore environments worldwide. Wells that were once considered plug and abandon candidates due to economic, technical challenges or accessibility may now be candidates for Small CT technology solutions. CT Run 4Perforation #1 The objective for this run was to perform an equalization shot from depth 2225-2235m MD-RKB. Start RIH with an equalizing shot at 15m/min and stop at 2261m MD-RKB (actual TD 2272m MD-RKB). CT Run 5 Perforation #2 The objective for this run was to perforate the interval 2220.7-2229.5m MD-RKB. RIH gun BHA with THP=550psi and stop CT at depth 2259.6m MDRKB to correlate depth. CT picked-up to top of the de...
Well completion in deepwater operations are particularly challenging from an engineering perspective. With the high cost and high risk associated with deepwater interventions it's critical to reduce the number of coiled tubing runs and maximize the number of operations that can be performed during one run into a well.CT perforation jobs have historically required multiple runs to correlate depth perforate and sometimes stimulate or gas lift a well. Recent advancements in this field have resulted in a suite of solutions based on a real-time downhole communication system comprising of a non-intrusive electrical conductor, surface hardware and software, and a combination bottomhole assembly (BHA). The combination BHA incorporates the motorhead assembly, conductor and BHA release function. It also includes a pressure, temperature, and casing collar locator sensor package for accurate depth correlation with high-resolution pressure and temperature data. The design also enables the use of ball-activated tools.A particular offshore Philippines deepwater project recently benefited from this technology. The CT downhole communication system obtained real-time data using a small-diameter conductor wire pre-installed inside the coiled tubing. The data was used to optimize the conventional coiled tubing interventions and expand the use of wireline logging tools. The internal conductor wire has minimal effect on the flow area of the CT or on the overall weight of the reel. The logging BHA was attached with mechanical and electrical quick connects and was rigged up offshore in minutes. This paper reviews how the new downhole communication system extended the capabilities of CT during two deepwater well interventions. It will further discuss the system's operational flexibility by illustrating the case study of running the system.
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