渤海深部气田水化作用对风化带砂砾岩地层影响分析研究

Analysis and Study on the influence of hydration of deep gas field in Bohai Sea on sandy conglomerate formation in weathering zone

在渤海油田存在的深部存在风化带砂砾岩地层,具有一定的水化作用,对钻井井壁稳产生影响。通过对比泡水后强度实验,发现水化作用对井眼的稳定性有一定的影响,结果表明,浸泡钻井液与未浸泡钻井液相比,岩心强度、弹性模量均有一定量的下降,泊松比上升较大。对现场作用具有一定的指导作用。

In the deep part of Bohai oilfield,there is weathered sandy conglomerate formation,which has a certain hydration effect and has an impact on wellbore stability. By comparing the strength test after soaking in water,it is found that hydration has a certain impact on the stability of the well. The results show that compared with the non soaking drilling fluid,the strength and elastic modulus of the core decrease to a certain extent,and the Poisson’s ratio increases greatly. It has a certain guiding role to the field effect.