Communication between surface and bottom hole is the k ey technology for automatic control of well trajectory, which is one of the main focuses in dril ling engineering at home and abroad.

• 井眼轨迹自动控制技术是当前国内外钻井技术领域的研究热点,其技术关键是地面与井下的信息通信问题。钻井液脉冲作为这种信息通信的一种有效方式,越来越受到人们的重视和青睐。