Research on Cementing Technology of Low-temperature Shallow Water Layer in Zhaoyan Block of Ansai Oilfield
Ansai Oilfield Zhaan Block is affected by long-term water injection development for many years,200-600 m shallow water layer water layer is active,the formation temperature is low,and there are Luohe,Zhiluo and other formations with low pressure bearing capacity,the conventional density can not meet the conditions of one-time construction,the low-density system has poor resistance to water intrusion of the upper strata,the strength of the development of the slow,the cement paste is subject to the influence of the formation water,resulting in the fluctuation of the quality of the cementing of the shallow water layer.In 2022,46 wells were constructed in Zhaan block of Ansai Oilfield,32 wells were mapped out,and 7 wells failed to be qualified for shallow water formation cementing,and the proportion of qualified wells is only 78.1％.In order to improve the quality of low temperature shallow water formation cementing in Zhaan block of Ansai Oilfield,it is necessary to carry out indoor research and on-site test of low-density cement slurry to meet the production demand.
shallow water formationlow temperatureformation watercementing quality
万方数据
维普
