Abstract
Japan Petroleum Exploration Co., Ltd (JAPEX) and Mitsubishi Gas Chemical Company Inc. (MGC) operate the Higashi Niigata Oil & Gas Field in Niigata, Japan. One of the wells, NS-6, a gas producer, had produced a large amount of formation sand, which filled up the surface production facility and production tubing resulting in production being shut-in at the end of 2002.
This paper will discuss a workover performed on this well, which was conducted in an effort to extend well life. Due to the depleted nature of the reservoir, a through-tubing gravel pack was chosen as the means to re-complete the well. The through-tubing gravel pack service was supplied by a local service company working in co-operation with a specialist through-tubing service provider who also provided onsite installation supervision. This method of through-tubing remediation was the first time this type of installation was used in Japan.
The local service company personnel with support from their Malaysia sand-control team worked with the customer and the specialist through-tubing service provider to design the job, and as a result of their expertise, the job was successfully performed. This case history will discuss 1) the planning and successful execution of the job, 2) its cost efficiency and safety, 3) its capability to meet majority of JAPEX’s and MGC’s goals, and 4) the valuable experience it provided for planning future remedial activities that may be required in this field.
