TX 75083-3836, U.S.A., fax 01-972-952-9435. ProposalNumerous oil-producing wells in Southern Oman are completed with wire wrap screens (WWS), internal gravel packs (IGPs), and predrilled liners. These wells produce from mature clastic formations where fines migration and subsequent blockage of screens can result in impaired oil production. In the past, conventional treatment using coiled tubing and a jetting tool has been chosen to remove this damage. The gains resulting from these intervention activities were more often than not short-lived. This lack of longevity required frequent well intervention and oil deferment, often resulting in a loss of revenue.Recently, a systematic approach was undertaken to evaluate the wellbore cleaning and stimulation tools that are currently available in the industry. This approach was implemented as a trial of three cleanout tools in oil-producing wells. This paper describes the results of using these tools for cleanout and stimulation of sand screens.Excellent success was achieved with a pulse-jetting tool operating on the Principles of Coanda effect. This tool is further described in the following sections, and results of its use in a number of oil-producing wells are presented. The effect of the cleanout procedure is presented in terms of initial production and sustainment of production level. This paper also outlines the importance of using proper cleaning and/or stimulation fluid. To help avoid clay-swelling problems, special emphasis is placed on the brine fluid salt concentration.Based on the success it has achieved, the pulse-jetting tool is now a standard tool used in well interventions geared for wellbore cleanout and/or stimulation. The versatility of the tool enables it to be deployed for use with coiled tubing or regular workover strings. Many fluids, including nitrogen, can be pumped through the tool. This versatility is important because most of the wells are sub-hydrostatic and require the use of nitrified fluid to maintain circulation in case cleanout and well-lifting operations occur immediately after sandstone acid stimulation.
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