利用直井-水平井联合开发薄差储层

JOINT DEVELOPMENT OF THE THIN-POOR RESERVOIRS BY MEANS OF VERTICAL-HORIZONTAL WELLS

大庆长垣外围TZ地区属于低渗透油藏,薄差储层发育,以三角洲外前缘沉积为主,连片性较好,油水关系简单,属岩性油藏.通过对区块完钻井钻遇情况统计,主力油层葡Ⅰ4层发育稳定.已投产区块利用直井开发,单井产量低,投产后产量递减快,并受裂缝影响含水上升快.在借鉴邻近区块开发经验的基础上,研究利用直井-水平井联合开发未动用区块.通过优化井位及井网部署,采用大规模压裂技术,实现了薄差油层的有效开发.完钻投产的水平井表明,初期取得了较好的效果.

The low-permeability oil reservoirs in TZ area outside Daqing Placanticline are characterized by well-de- veloped thin-poor reservoirs and mainly sedimentated deltaic outer-front facies with much better connectivity and continuity. In addtion, the relations between the oil and water are pretty simple, the reservoirs belong to lithologic ones. By means of the statistics of the penetrated conditions of the drilling and completion in the block , the main oil reservoir--PI4 is stably developed. For the brought-in blocks drilled by vertical wells, the production of the sin- gle well is rather lower, the production decline is rather faster, and moreover due to the influences of the fractures, the water cut increases rapidly. On the basis of the learning from the development experiences nearby the blocks, the joint development between the vertical and horizontal wells is research to produce the undeveloped blocks. Through the optimized well location and well pattern arrangement, and furthermore with the help of large-size frac- turing operation, the effective development of the thin-poor oil reservoirs is realized. The production of the drilled and completed horizontal well shows that the initial effects are much better.