塔里木泛哈拉哈塘地区扭力冲击钻井技术

Torsion-impact drilling technology in general Hanilcatam area, the Tarim Basin

针对塔里木泛哈拉哈塘地区油气藏埋藏深,二开裸眼段长,深部地层研磨性强,软硬交错,钻头吃入地层效果差,PDC钻头失效快,钻井机械钻速以及中标费用低等特点和难点,引进扭力冲击钻井技术,力求通过高效破岩技术提高机械钻速、降低成本。2012—2015年进行了36口井试验与应用,结果表明,试验与应用井段平均机械钻速达到5.74 m/h,是转盘钻井技术的2倍以上,是复合钻井技术的1倍以上,平均单井缩短钻井周期25.87 d,提速效果和经济效益显著,为塔里木台盆区深井、超深井钻井提速降本提供技术支持。

In general Hanilcatam area of the Tarim Basin,oil and gas reservoirs are deep,the open hole section of second spud islong,and the deep layers are of strong abrasivity with the crossing of competent and incompetent beds.Therefore,the drilling in thisarea is faced with multiple difficulties,e.g.poor penetration of bits,rapid failure of PDC bits,low ROP and low bid price.To solve theseproblems,the torsion-impact drilling technology was introduced to increase the ROP and decrease the cost by using high-efficiency rockbreaking technology.This technology was tested and applied in36wells from2012to2015.It is indicated that it is remarkable in ROPimprovement results and economic benefit.The average ROP of hole sections where this technology was tested and applied is5.74m/h,which is over2folds that of rotary drilling technology and over one fold that of combined drilling technology.And the drilling periodof each well is reduced by25.87days on average.It provides the technical support for ROP increase and cost decrease of deep and ultradeep well drilling in the platform-basin area of the Tarim Basin.