With 20 years'production practice, the writer proposes the methods of improving the service life of wire - line impregnated diamond drilling bits from 8 aspects.
通过近二十年的生产实践，从胎体配方等八个方面提出提高绳索取芯孕镶金刚石钻头寿命的方法。
By dynamical drilling tools matching with PDC drilling bits, drilling rates are able to be increased greatly, drilling costs are decreased greatly, and the drilling cycles are shortened.
动力钻具配合PD C钻头钻井，可以大大地提高机械钻速、降低成本、缩短钻井周期。
The valve at the bottom of auger can prevent drilling bits entering hollow pipe during operation. When drilling pipe is taken out and concrete grout is injected, the valve will be opened.
螺旋钻头底部阀门防止钻进过程中钻屑进入到空心的混凝土管中，当钻杆提出同时混凝土浆注入时，钻杆底部的阀门将被打开。
The valve at the bottom of auger can prevent drilling bits entering hollow pipe during operation. When drilling pipe is taken out and concrete grout is injected, the valve will be opened.
螺旋钻头底部阀门防止钻进过程中钻屑进入到空心的混凝土管中，当钻杆提出同时混凝土浆注入时，钻杆底部的阀门将被打开。
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