“水上漂”油层水平井地质导向录井技术——以胜利油田G43-p17井为例

Geo-steering logging technology for horizontal wells in "floating on water" reservoir——taking well G43 p17 in Shengli Oilfield as an example

由于老油田已进入开发后期,含水较高,"水上漂"油层水平井日趋增多,对水平井地质导向着陆点及轨迹控制提出了较高的要求。胜利油田G 43-p 17井沙三段及沙一段油藏受不整合面控制,地层倾角大,油层与泥岩隔层间互,油层厚度逐渐减薄,且水平段内有断层,针对这些地质特点与导向难点,做好录井预案,综合运用地质导向技术,通过精细地层对比与地质建模,做好地层对比与预测,准确卡准A靶点,比设计顶界深度深了1.8 m;通过轨迹的精细控制与调整,做好地质解释与导向,准确卡准完钻深度,水平段油层钻遇率比地质设计提高了13.3%,较好地解决了该类水平井的导向难题。

Since the old oilfields enter to the end of development stage,which may contain more water.The horizontal wells in 'floating on water' reservoirs are increasing,then put forward a higher requirement on geo-steering landing point and trajectory control of horizontal wells.The reservoirs in Es3 and Es1 members of well G43 pl7 in Shengli Oilfield was restricted by unconformity surface control,the formation dip was large,oil layers were interbedded with mudstone,reservoir thickness was gradually thinning,and there were faults in the horizontal section.According to these geological features and geo-steering difficulties,a better mud logging plan was done,geo-steering technology was comprehensively used.Through fine stratigraphic correlation with geological modeling,the stratigraphic correlation and prediction was done well,target point A was accurately determined,which was 1.8 m deeper than the designed top boundary depth.By fine control and adjustment on the track,good geological interpretation and geo-steering were achieved,the drilled depth was accurately determined,and the drilled rate of oil layers in the horizontal sections was 13.3%higher than the geological design.The guidance problems of this kind of horizontal wells have been solved well.