提高电缆地层测试成功率新方法

A New Method to Improve the Success Rate of Wireline Formation Testing

渤海K油田纵向水系复杂,油水层电阻率差异较小,常规测井曲线对该区块油水层难以识别,电缆地层测试技术对该区块油水层判断有重要作用;但是受该区块明下段砂体埋藏浅,压实程度差,油质偏重等因素影响,电缆地层测试过程中易出现漏封和地层出砂堵塞管线现象导致取样失败。文章通过对该区块多口井取样过程中的一些问题进行分析,总结了如何提高浅层疏松砂岩电缆地层测试成功率推荐做法,并在该区块其他井应用并取得较好效果,对该区块储层流体性质判断起到至关重要的作用。

The vertical water system of Bohai K oilfield is complex,and the resistivity difference between oil and water layers is small.It is difficult to identify the oil and water layers in this block with conventional logging curves.However,due to the shallow buried sand body,poor compaction degree,heavy oil quality and other factors in the lower Ming section of the block,it is easy to lead to leakage sealing and sand production blocking the pipeline in the process of cable formation testing,which leads to sampling failure.Based on the analysis of some problems in the sampling process of several wells in this block,this paper summarizes the recommended methods to improve the success rate of cable formation test in shallow unconsolidated sandstone.It has been applied in other wells in this block and achieved good results,which plays an important role in the judgment of reservoir fluid properties in this block.