CO2混相压裂技术在G区块的应用

Application of carbon dioxide miscible fracturing technology in block G

针对J油田G断块的低渗、强水敏、能量不足及原油凝固点高,开发难度大的问题,从储层特征及生产动态分析出发,提出了CO 2复合化学剂混相压裂技术。该技术利用CO 2配合增溶剂蓄能压裂补充地层能量,通过不返排酸及缩膨剂解除地层堵塞,应用降凝剂提高原油低温流动性,实现储层改造,增大泄油面积,提高产量。该技术在J油田G、L两个相似断块的9口井开展了现场试验,措施后单井平均日产量与措施前相比增加了4.7~6.5倍。该技术的成功应用,打开了J油田提高单井产量的突破口,为类似非常规油气藏增产提供了重要的技术支持和保障。

Aming at the problems of low permeability,strong water sensitivity,insufficient energy,high freezing point and difficalt development in G fault block at J oilfield,an innovative carbon dioxide miscible fracturing technique is proposed,which is based on the analyses of reservoir characteristics and production dynamic.This technology used carbon dioxide combining with solvent boosting energy storage fracturing to supply formation energy,removed formation blockage by no acid regurgitation and swelling agent,improved low temperature fluidity of crude oil by using pour point depressant,then realized the reservoir reconstruction,increased drainage area,and improved the production.The field tests were carried out with 9 wells in G and L fault blocks.The average daily production after the measures was 4.7-6.5 times higher than before.The successful application of this technology opens a breakthrough to increase the output per well in J oilfield,and provides important technical support and guarantee to increase production for similar unconventional oil and gas reservoirs.