地震钻井用双开门式钻头的研制

Development of two-gate drill bit for seismic drilling

地震勘探钻井中 ,由于流沙粒石地层坚硬且易塌陷 ,用普通钻头钻井时 ,进尺速度慢且井壁易塌陷 ,常造成下药作业困难。为此 ,研制成功地震钻井用双开门式钻头。这种双开门式钻头主要由导程叶片、紧固销、叶片刀块、叶片、球面活门、活门刀块、门轴和钻头体等组成。它的进给速度达 0 1m/s ,提升速度达 0 5m/s ,额定钻进深度 30m ,钻孔直径达 180mm ,适用流沙粒石地层 ,也适用于普通地层地震钻井 ,经济和社会效益可观。

A two-gate drill bit for seismic drilling in quicksand and grainy stone formation is developed. The key technique of the bit lies in two active gates fixed on the lower part of the bit as dynamite passage. The operating principle of the bit is expounded, and its technical parameters are presented.