南堡深层水平井探潜山面井斜角设计方法

为保证深层潜山水平井实钻轨迹能够顺利有效进入潜山,且沿地质要求的有利储层段钻进,建立了一种深层潜山水平井探潜山面井斜角的设计方法。以设计轨道沿潜山高部位向低部位钻进这种相对难进山且进山后容易穿出有利储层的情况为研究对象,分析了地层倾角、有利储层预测厚度和工具造斜能力与设计探潜山面井斜角之间的关系,考虑了地层倾角与设计轨道方位间的夹角、地层倾角预测误差和有利储层厚度预测误差等主要影响因素,建立了探潜山面井斜角计算模型,并应用于冀东油田深层潜山水平井设计。实钻表明:该设计方法达到了有效探潜山面并顺利沿地质要求的井段钻进的目的。

Method for designing the hole inclination of horizontal well for detecting the surface of deep buried hill of Nanpu Oilfield

To ensure the track of the deep buried hill horizontal wells can effectively enter the buried hill reservoir and drill in the favorable reservoirs as geologists desired, we have established a method for designing the hole deviation angle of horizontal well for detecting the surface of deep buried hills. Taking the designing of the well trajectories starting from the high position of the buried hill to the low position, where entering the buried hill reservoir is relatively difficult and the favorable reservoirs tend to be drilled through as the research object, we have analyzed the relationship of the formation dip, reservoir thickness, tool angle building capability, and the designed inclination for detecting the surface of buried hills; considered the main influence factors, such as the angle between formation dip and designed azimuth, prediction error of the formation dip, the error of thickness prediction of the profitable reservoirs, etc.; established the model for calculation of the hole inclination for detecting the buried hills and have applied it to the design of horizontal wells into buried hills in Jidong Oilfield. The actual drilling shows that the design method has achieved the goal of effectively detecting the buried hill surface and drilling along the profitable reservoirs as the geologists desired.