浅部砂层井漏现象的分析及预防措施

Analyses and Prevention of Mud Losses in Shallow Sand Formations

在冀中油田和冀东油田的某些区块打井,有时会发生伴随停泵外吐钻井液的浅层井漏,这种井漏的堵漏成功率低,易发生反复漏失。举例介绍了伴随停泵外吐钻井液的浅层井漏情况,分析了诱发井漏的原因,总结了井漏和堵漏过程中的各种现象以及存在的认识误区,提出了应采取的具体有效防漏堵漏措施。指出,尚未找到有效的堵漏手段,不要试图采用常用堵漏技术将漏层完全堵好;采用循环中加入堵漏材料、适当控制钻速、降低循环排量等措施,尽量控制漏失速度和维持连续施工,是相对节约时间和费用的堵漏措施。

Drilling in the middle and east of Hebei Province sometimes found the 'kick' of the lost mud in the shallow formations after mud circulation was stopped.Mud losses in these formations were difficult to stop.This paper introduced the mud losses in shallow formations and the accompanied 'mud' kick while circulation was stopped temporarily,and the measures for mud loss control.It was concluded that mud loss control methods suitable for the mud losses in the shallow formations had not yet been developed.The best that can be done in control the mud losses for now is to use lost circulation materials while drilling,control penetration rate to a reasonable level,and reduce mud flow rate.