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油田开发勘探至今已经步入后期,开发面临难度逐渐增大,水平井的开发比重不断增多,水平井开发的油藏类型日趋多样化,完井方法日益丰富,同时,越来越看重固井质量。实践证明,低渗透油藏、地层不整合油藏、断裂储层和超薄油藏可以用水平井成功开采,大大提高了石油和天然气产量;水平井对老井的二次开采也十分有效。A油田地质构造复杂,地层倾角大,断层及裂缝多,地层压力层系混杂、储层薄,渗透率低,含较多盐膏层,易漏失,固井难度大,改善起来困难。针对A油田复杂的地质构造,对固井工艺和水泥浆性能加以改进,以提高A油区的固井质量[1]。
Oil exploration and development have entered the later stage of development, the difficulty of development is gradually increasing, the proportion of horizontal wells is increasing, the types of reservoirs developed by horizontal wells are diversified, the completion methods are increasingly enriched, meanwhile, the cementing quality . Practice has proved that low permeability reservoirs, unconformity reservoirs, fractured reservoirs and ultra-thin reservoirs can be successfully exploited with horizontal wells, greatly increasing the output of oil and gas; horizontal wells are also effective for secondary recovery of old wells. A Oilfield is characterized by complex geological structure, large dip of strata, more faults and fractures, mixed formation pressure layers, thin reservoirs, low permeability and more salt-gypsum layers, which are easy to lose and difficult to cement, which makes it difficult to improve. In view of the complex geological structure of A field, the cementing process and slurry performance are improved to improve the cementing quality of A oil zone [1].