Analysis of water injection and formation water compatibility and anti-scale technology research in Zhengning oilfield
On the basis of the water quality analysis of the Chang 2 and Chang 8 formation water in Zhengning oilfield and the water injection of the Zhiluo formation of Ningyi station,the scaling trend of single water samples and mixed water samples was predicted,and the results showed that the produced water was calcium chloride water type containing scale ions,which was easy to generate calcium carbonate.After the water injection of the Zhiluo formation was mixed with the water of Chang 8 formation and the formation water of Chang 2 and Chang 8 according to different proportions,calcium carbonate scale and calcium sul-fate scale were produced,and the scale was mainly calcium carbonate scale.After the water injection of the Zhiluo formation was mixed with the water of the Chang 2 formation,there was less calcium carbonate scale,and there was no calcium sulfate scale.In order to solve the problem of calcium carbonate and calcium sulfate scaling under the mixed infusion of water injection in Chang 8,Chang 2 and Zhiluo groups,polycarboxylate antiscalants CQ-ZG02,organophosphate antiscalants ZG-558 and HZG-05 were selected to test their antis-caling effects,and finally antiscalants HZG-05 with descaling rates greater than 80.00%were optimized.In summary,HZG-05 has a better descaling effect when three kinds of wa-ter samples are mixed.
万方数据
维普
