Advances on special structure drilling development techniques in Shengli Oilfield

Abstract

Shengli Oilfield has developed the reservoir engineering design and drilling-completion-production techniques of special structure drilling for reservoirs with bottom water, fault block, heavy oil, unconformity etc, and drilled different types of wells including horizontal well, sidetracked well, extended reach well, multi-lateral horizontal well and so on. There are 586 different horizontal wells in 181 reservoirs of different types, and 742 sidetracked wells in 284 development units. The annual oil production is 1.21 and 0.79 million tons, respectively, and the cumulative oil production 8.25 and 4.09 million tons. The special structure drilling has become one of the dominant techniques for the stable production and production growth of the field. In recent years, new advancements have been achieved in the reservoir description, reservoir engineering design, well drilling technology, well completion technology and producing technology for thin-layer reservoirs, high-cut-water thick-layer positive rhythm reservoirs, buried hill heavy oil reservoirs, extra-heavy oil reservoirs, and complicated fault-block reservoirs. Key words: Shengli Oilfield, special structure well, horizontal well, side-track well, extended reach well, multi-lateral horizontal well, fishbone horizontal well, horizontal well injection