底水油藏水平井开采物理模拟试验研究

Physical Simulation Experiment of Horizontal Well Production in Reservoirs with Bottom Water

水平井技术是开采底水油藏的一项重要技术,针对水平井进行了水淹模式和水淹动态的试验研究。结果表明:三维模拟试验系统能真实、直观地描述底水油藏水平井在不同生产压差和含水率条件下水锥的形态和上升速度,能反映出水平井的水淹动态和模式;"中部见水-两边扩展-全井水淹-翼部抬升"是底水油藏水平井的水淹模式,并且大生产压差下的水脊较陡,水脊的指进现象明显;在含水率较高的开发后期油水界面上移。生产压差变大,无水采油期缩短,无水采油量减少,但最终采收率接近。

The technique of horizontal wells was one of the important techniques for the development of reservoirs with bottom water. In combination with horizontal wells, experimental studies were conducted on water-out patterns and water-out dynamics. The result indicates that the three-dimensional simulation experiment system can clearly and accurately describe water coning shape and its increase velocity of reservoirs under the conditions of different production pressure differences and water cuts and reflect the water-out dynamics and its pattern. The water-out pattern of reservoirs with bottom water is that water producing in the middle-expansion on both sides, water-out in the whole well, rising in the flank;water crest is steep under high production pressure difference with obvious fingering, oil-water interface moves upward at the late stage of development, production pressure difference is highly changed with short period of non-water production and small amount of oil, but the ultimate oil recovery ration is approximate.