港深69X1井钻井液工艺

港深 6 9X1井是 1口高难度大位移定向探井,完钻井深 5 46 4.43m,井底水平位移 3118.0 4m,钻井周期111.88d,是目前我国陆上油田斜深最深水平位移最大的 1口探井。介绍了钻井液工艺技术,采用聚合物钻井液体系,利用聚丙烯酸钾对岩屑的包被作用,抑制粘土造浆;为维护井壁稳定,上部地层采用聚合物抑制性钻井液,下部地层采用硅基防塌钻井液;根据邻井的测井资料和岩心样品确定的地层孔隙压力、破裂压力、坍塌压力的剖面及其它资料和现场情况确定了钻井液密度;为降低摩阻扭矩,采用了 4种不同的润滑材料,30 0 0m以浅井段采用白油,30 0 0m以深井段采用多功能固体润滑剂和大粒塑料微珠;在井眼净化和油气层保护方面,分别采用提高钻井液携砂能力、加大泵排量及选用屏蔽暂堵技术等措施,保证了施工的顺利进行。

Drilling Fluid Technology for Well Gangshen 69X1

Well Gangshen 69X1 is an extended reach exploratory well with its bottom depth at 5464.43m, and a horizontal displacement of 3118.04m. A period of 111.88 days are used for drilling this well, and it sets the records of the longest deviated section and longest horizontal displacement on land China to date. Drilling fluid technology is focused in this paper, more specifically, polymer based drilling fluid system is used to control the mud making tendency of clay by the effect of potassium polyacrylatic. To maintain well stability, polymer mud is used in the upper formation, and silicon based anti-sloughing drilling fluid is used in the lower section. Drilling fluid weight is determined referring to the formation pore pressure, fracturing pressure, and collapsing pressure profiles obtained from the offset loggings and core samples, together with the field condition. Four types of lubricating materials are selected to reduce friction and torque. White oil is used above 3000m, and multifunctional solid lubricant and plastic spheres are used below 3000m. In hole cleaning and reservoir protection, such measures as improving cuttings transportation, increasing pump rate and adopting temporary plugging are taken to enhance the field drilling.