Techniques of sand control are roughly divided into three types. One is control of production rate, next is using screens such as gravel pack, and the last technique is screen-less method.Japan Petroleum Exploration executed the screen-less sand control to the new well of the Amarume oilfield in Yamagata Prefecture in 2003, and Japan Petroleum Exploration and Mitsubishi Gas Chemical executed the through-tubing gravel pack (TTGP) to the existed well of the Higashi-Niigata oil & gas field in Niigata Prefecture in 2004. Both operations were the first trials in Japan and are presented about the outline of the work in this paper.