泵注反循环钻井循环压耗实验研究

Experimental Study on the Cyclic Pressure Loss of Pump Injected Reverse Circulation Drilling

(中国石油大学(北京)石油工程学院,北京102249)

 

(College of Petroleum Engineering, China University of Petroleum (Beijing), Beijing 102249, China)

关键词: 泵注反循环钻井, 循环压耗, 钻头水力参数, 实验研究, 最优化

Pump injected reverse circulation drilling is a new drilling method. It has lots of advantages (such as cleaned hole and high ROP) compared with previous method, which can be used in drilling complex structural well. As we all know, cyclic pressure loss is one of the most important topics in drilling. The laws of cyclic pressure loss in different nozzles or mud parameters are studied experimentally in lab. The paper analyses the major factors affected cyclic pressure loss, according to results of the simulated experiment. It comes to the conclusions that the area of the bit nozzles should be a half of the drilling stem. And the edge of the bit is the best position to place the bit nozzles. At the same time, the cyclic pressure loss can be higher while the density of drilling fluid increases. However, the density doesn’t seem to affect the best arrangement of bit nozzles. Theoretical basis is provided for optimized design of pump injected reverse drilling bit nozzles.

国家自然科学基金创新研究群体项目(51221003);国家863 主题项目“致密气藏高效钻井技术研究” (2013AA064803);联合基金项目“页岩气钻探中的井壁稳定及高效钻完井基础研究”(U1262201

10.3969/j.issn.1006-396X.2016.02.006