在复杂地层钻进物探震源孔系列钻头的研制与应用

在密山一带休物探震源孔，外遇地层为胶泥、沙土、风化岩、青石板及河流石等。为此研制了一系列新式钻头，包括９８ｍｍ三牙轮钻头、９８ｍｍ刮刀式ＰＤＣ钻头及１１８ｍｍ砾石流沙炮眼防卡钻头，前２种钻头现场共应用９３０口井，创造了极好的经济效益和社会效益。

Development and Application of Series of Bits to Drilling Geophysical Prospecting Epicentre Hole in Hostile Stratum

A new series of bits specifically developped is applied to drilling geophysical prospecting epicentre hole in stratum of bonding clay, sand clay, mantle rock, blue broad stone and river stone and so on in Mishan. The bits include two wings scraping cutter bit of diameter 98 mm, three rollers bit of diameter 98 mm, PDC scraping cutter bit of diameter 98 mm and anti stuck bit of diameter 118 mm applied to gravel and heaving sand. The number of drilled holes using two wings scraping cutter bit and three rollers bit is 930. Those bits have achieved better economic and social results.