稠油降粘冷采先导试验研究

Pilot Experimental Study on Heavy Oil Viscosity Reduction

摘要: 中石油在海外拥有的H区块，未动用的地质储量大于20 MMBL就有稠油藏7个，地层中原油自身粘度高，在现有生产条件下不能流出地层，无法动用。因此先在室内对稠油降黏实验，验证纳米复合降黏剂配方效果，再结合油藏数值模拟，优化冷采降黏吞吐工艺参数，通过研究稠油区油层特征，稠油性质，油井测试生产作业等情况后，优先在B1/3稠油区块选择先导试验井B-1，油井降黏措施后生产效果证明：目前降黏剂配方，工艺参数代表的稠油冷采技术有效成功动用了B1/3区块稠油。该井试验中涉及的各方面问题和对应措施为未来该区块或其他稠油区块动用起到了良好的示范。

Abstract: In the overseas H block owned by CNPC, there are 7 heavy oil reservoirs with unused geological reserves greater than 20 MMBL, and the crude oil itself in the formation has a high viscosity, which cannot flow out of the formation and cannot be used under the existing production conditions. Therefore, the heavy oil viscosity reduction experiment was carried out in the laboratory to verify the effect of the nanocomposite viscosity reducer formulation, and then combined with the numerical simulation of the reservoir, the cold recovery viscosity reduction huff and puff process parameters were optimized, and after studying the oil layer characteristics, heavy oil properties, and oil well test and production operations in the heavy oil area, the pilot test well B-1 was preferentially selected in the B1/3 heavy oil block, and the production effect of the viscosity reduction measures of the oil well proved that the heavy oil cold recovery technology represented by the current chemical formula and process parameters effectively and successfully used the heavy oil in the B1/3 block. The various problems involved in the well test and the corresponding measures have set a good example for the future production of this block or other heavy oil blocks.