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用盐酸对油层酸化要求在排液过程中及时跟踪测定残酸浓度,根据残酸浓度变化了解排液情况,观察酸化效果。目前,现场测定残酸浓度的方法是:取一定量经过过滤后的残酸液,以酚酞作指示剂,用氢氧化钠标准溶液滴定,根据当量定律求出残酸浓度。在二连盆地阿北油田的阿101井等4口井及冀中油田的一些井酸化后残酸测定时,发现滴定过程中产生绿色或红棕色絮状沉淀,造成残酸浓度测定不准,严重者测不出来,给残酸
Hydrochloric acid requires the acidification of the oil layer to track and determine the residual acid concentration in the drainage process in time, and understand the drainage effect according to the change of the residual acid concentration to observe the acidification effect. At present, the method for determining the concentration of residual acid in the field is as follows: a certain amount of filtered residual acid is titrated with a standard solution of sodium hydroxide using phenolphthalein as an indicator, and the residual acid concentration is obtained according to the equivalent law. During the acidification of some wells in 4 well wells in Well North of Erlian Basin in North Aubei Oilfield and some of wells in Jizhong Oilfield, it was found that during the titration process, green or reddish-brown flocculent precipitates were found, which resulted in inaccurate determination of residual acid concentration, Can not be measured in severe cases, to residual acid