安4井超高压固井技术研究

为了在复杂地质条件下完成超高压固井，针对准噶尔盆地南缘北天山山前构造带高地应力区塑性泥页岩井钻井、固井以及注水泥作业的主要困难，提出了套管强度（包括井眼准备与下套管操作）和超高密度水泥浆体系设计的若干准则。施工参数记录表明：按此设计，并选用单级注水泥体系和有效粘度计算法确定流变学平衡注水泥参数和完全塞流顶替工艺技术，使安４井成功地完成了国内首次超高压固井施工。

RESEARCH ON THE SUPRA-HIGH PRESSURE CEMENTING TECHNIQUES

Within the North Tian Shan piedmont structural belt along the southern fringe of the Junggar basin, plastic claystone formations below the high geo-stress area have posed many difficulties on drilling and cementing operation. In order to achieve successful completion under such complex geologic conditions, the authors put forward six criteria in regard to the design of casing strength (including wellbore preparation and running casing) and slurry system. Operation record and logging examination indicate that, by using these design criteria and with primary cementing and plug flow displacement technology, the cement job at Well An-4 has been a success.