A successful evaluation and development program in a tight gas-bearing formation requires considerable analysis, not to mention optimization to help ensure a profitable income. In time where problems arise and impact the performance of the well during completion, the risks of well intervention increase significantly. These problems sometimes are not allowing a hydraulic fracturing treatment to be performed. In a situation where hydraulic fracturing treatment is not feasible, an optimized stimulation design is needed to guarantee commercial gas production from the well within current completion constraints and allocated budget. In the attempt to find an economical yet effective stimulation solution, the hydrajet fracturing process was chosen to be implemented. This stimulation technique has a proven success rate in onshore applications. To increase the treatment efficiency, a novel acid-soluble abrasive material was used to connect the reservoir to the wellbore, which helped avoid sand cleanout time and use of additional chemicals. It was followed by a pinpoint acid stimulation to unlock the hydrocarbons in a low-pressure area of the reservoir. The post-treatment result showed a very promising result with the gas rate achieved, which was approximately double the rate expected by a conventional bullhead acid fracturing treatment. This has demonstrated the value that the technique brought to the industry. This paper discusses not only the result of the technique compared to wells that are completed and evaluated with different completion schemes, but also presents a best practice for the method used to stimulate a well. The success of this operation resulted in providing an alternative to completing their requirements relatively faster and more cost-effectively.
This paper describes a coiled tubing milling operation using fiber optic enabled coiled tubing and downhole tools for real time depth control and downhole monitoring of critical parameters. A description of the technology used, the job design, tool selection and execution of the job, the challenges encountered during the operation and the successful outcome are presented and discussed in the paper. The case history presented in this paper marks the first time that this particular fiber optic technology had been applied during a milling job worldwide. Coiled tubing milling operations can be challenging when precise depth measurement is critical. For the case history discussed in this paper the operator needed access to the production liner below the end of tubing with a BHA with a larger outside diameter than the inside diameter of the nipple installed in the tail pipe of the tubing. It was necessary to mill out this nipple profile while ensuring that other completion accessories above the nipple, including the production packer, were not inadvertently milled or damaged. Therefore, accurate depth control during the milling process was essential. Depth control was obtained with the real-time fiber optic CCL measurements. In addition, real-time pressure and temperature measurements were available from the fiber optic enabled BHA to monitor the milling parameters. The latest fiber-optic technology for coiled tubing including modules for CCL, temperature and pressure was used for the first time during a milling job. The data recorded, transmitted and integrated with the data acquisition software, created the ability to customize and optimize well intervention in realtime, and ensured that the required depth control precision was obtained, with precise control on the downhole milling parameters to optimize the milling operation.
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