探井井下流体温度异常在工程找漏上的应用

Application of Temperature Anomaly of Drilling Well in Mud Loss Locating

能否在短时间内准确判断出漏点位置是成功堵漏的关键。利用井下温度变化引起热变电阻阻值变化的原理测量井内流体温度的井温测井的方法,移植到探井中,利用井下流体温度异常变化在温度曲线上的反映判断井漏的漏点位置。在已知钻井深度以上地层漏失泥浆的地区,可以用温度测井确定循环失灵的深度。通常温度测井曲线将显示井漏位置出现温度降低的异常,紧挨漏失点以下温度急剧增加。漏失量越大,变化越明显。井下流体的温度异常并不都是由于井漏造成的,要结合围岩性质等条件综合考虑。在安全条件允许的情况下,利用井下流体温度判断井涌深度位置的准确率会更高。该方法具有快速、经济、实用的特点,经过在塔里木油田多次使用,取得了非常理想的应用效果。

Mud loss in a drilling well makes a lot of mud flow into formation, then results in an abnormal decrease of well temperature about the leakage, so the leakage position can be located by temperature anomaly in a temperature log of the borehole fluid. The method has been experimented in Tarim Oilfield for 5 well-times in 4 wells, all location of leakage are pointed out correctly, and then all are successfully plugged within one operation.