东河1-H18C井钻井复杂情况分析

Drilling difficulties analysis for Donghe 1-H18C well

丛长江 陈世春 王树超

CONG Changjiang CHEN Shichun WANG Shuchao

渤海钻探工程有限公司塔里木钻井分公司，新疆库尔勒　841000

Tarim drilling brach of CNPC Bohai drilling engineering company limited, Korla 841000, China

东河1-H18C井是位于塔里木东河油田东河1区块的一口开窗侧钻定向井。该井钻井工程的难点是：同一裸眼内存在压力系数相差较大的地层，极易造成粘卡；井斜角达到57°，?152.4 mm井眼下?127 mm尾管，环空间隙小，固井风险大。实钻过程中发生卡钻和固井憋高压事件。通过对钻井工程难点的细致分析，从中找出导致事件发生的原因，从而采取必要的措施，在今后的钻井生产中加以避免，可对现场技术工作起到借鉴作用。

Donghe 1-H18C well is sidetracked directional well in Donghe 1 Block of Donghe Oilfield in Tarim Basin. The difficulties of drilling the well are that some layers with big difference of pressure gradient exist in the same borehole, causing the tendency of sticking; inclination angle is 57° and ? 127 mm liner is run in ?152.4 mm borehole, with small annular space, causing big risk in cementing. Because of the difficulties, drill pipe sticking and cementing pressure building accidents happen in drilling process. Through detailed analysis, the reason leading to the accidents was found and some essential treatment was taken to avoid them, which could play a directional role in field technical work.