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辽河油田西八千和欢喜岭地区主要产油层是沙一、沙二、沙三地层。这些油层大体上由西向东逐渐加深,岩性由软变硬。由于油层深度、岩性、岩石可钻性变化较大,给取心工作带来一定困难。过去使用T-100型(仿长庆油田YT-100型)取心工具在该区取心,由于该工具的悬挂销钉容易提前剪断,钻头结构存在一些问题,不能很好地保护岩心,因此岩心收获率仅70％左右,油层岩心收获率更低,对全面、正确了解该区油层特性带来一定困难。
West Liaohe Oilfield West eight thousand and Huanxiling area is the main oil producing sand, sand two, sand three strata. These reservoirs gradually deepen from west to east, and lithology is soft and hard. Due to the depth, lithology and drillability of the reservoirs, great changes have taken some difficulties in the coring work. In the past, a coring tool of T-100 type (YT-100 of Imitation Changqing Oilfield) was used for coring in this area. Since the hanging pins of the tool are easy to cut off in advance, there are some problems in the structure of the bit, which can not well protect the core. Therefore, The harvest rate is only about 70%, and the oil recovery rate is lower, which brings some difficulties to the comprehensive and correct understanding of reservoir characteristics in this area.