水平井注水开发碳酸盐油藏实践

Horizontal Water Flooding in Carbonate Reservoir Development

阿曼Daleel油田是低渗碳酸盐油藏,在衰竭式开发之后,选择用水平井注水技术来实现其二次开发。作为一种高效的油气田开采技术,水平井注水技术对低渗透油田的开发效果有可极大的改善作用。虽然水平井注水较直井注水具有上述的优势,但它并不是万能的。先导注水试验表明,水平井注水能增大注入量,降低油井气油比,降低注入压力,增大了产油量,与配套水平产油井生产效果良好。精确地质导向技术确保水平钻井的成功,最大限度地确保钻井的成功率。阿曼相邻油田有利用裸眼井分支井和水平井进行注水开发取得成功的经验,油田采用裸眼完井方法进行注水开采完井。考虑油田的气举规模,注水开发后用电泵采油更合适。规模应用水平井注水及其相关配套技术在阿曼Daleel油田取得了良好的效果。

Daleel field in Oman is a low permeability carbonate reservoir. After the depletion development, they apply horizontal water flooding technology for the oilfield redevelopment. As a highly effective exploiting technology, the horizontal water flooding technology may greatly improve the low permeable oilfield. Despite of the advantages of horizontal water flooding over vertical water flooding, this technique has to be further improved. Pilot injection tests show that it can increase the rate of injection, reduce the gas/ oil ratio, the injection pressure and increase the influx while working with horizontal oil producers. The accurate geological guiding technology ensures the horizontal drilling, with high success rate. Oman neighboring oilfields have accumulated useful experience on developing wells of bare hole and branch hole and horizontal water flooding. They adopt the bare hole method tocomplete wells. Considering to the lift level for oilfield gas, it would be better to use electric pumps to extract oil after water injection. Large scale applications of horizontal water flooding with related measures have produced good results in Daleel field in Oman.