徐深气田深层气体钻井设计及对策

大庆油田徐深气田深层温度高，岩石可钻性极值高，常规钻井机械钻速低。从2005年开始进行了空气钻井科研攻关和现场试验研究，主要目的是利用气体钻井技术来探索提高泉头组以下地层的机械钻速。针对气体钻井过程中地层出水、出气、井斜、井壁剥落掉块和井壁坍塌等问题，提出在实施钻井前，进行邻井资料调研，确定技术套管封固井段，避免钻遇水层，在实钻过程中利用湿度监测来提高地层出水的综合判断能力；对于气体钻井井斜问题，可以通过优化钻具组合和钻井参数，降低钻压，控制机械钻速，加强实钻监测井斜来预防和控制。

PLANNING AND SOLUTION FOR GAS DRILLING IN DEEP FORMATIONS OF XUSHEN GASFIELD

In deep formations of the Xushen gasfield in Daqing, the temperature is high, the rock drillability limit is high, and the ROP of conventional drilling is low. Thus since 2005 air drilling technology has been studied and field tested, meant to explore an effective method to improve the ROP in formations below Quantou group by using gas drilling technology. For problems of water production, gas production, well deflection and wellbore instability occurred during gas drilling, it is recommended to conduct offset investigation before deciding the intermediate casing interval so as to bypass the water zone, and it is recommended to conduct humidity monitoring during drilling process to improve water production judgment. For well deflection tendency during gas drilling, the BHA and drilling parameters can be optimized to reduce WOB and control ROP, and MWD job be better done to prevent well deflection so as to ensure wellbore quality.