KWQ-216型地面可控井下变径稳定器

地面可控井下变径稳定器可以对井眼轨迹进行有效的控制与调整，以其成本低、控制效果好等特点在国外已规模应用，国内已有成功应用案例，但远未普及。介绍了地面可控井下变径稳定器工具的结构组成和工作原理，利用CAE技术对KWQ-216变径稳定器的壳体和弹簧座销等易失效部件进行了安全性分析，工具的工作安全性较高。介绍了与该工具配套使用的钻具组合。该工具通过地面开停泵液压式控制和井下机械式机构锁紧，变径准确可靠，操作简单方便，科学使用可变径稳定器可以经济、精确地控制井斜角和方位角，提高井身质量，缩短钻井周期。

KWQ-216 surface controlled downhole variable diameter stabilizer

Surface controlled downhole variable diameter stabilizers could effectively control or adjust well trajectory. They have been applied overseas on a large scale due to its low cost and good control effects, while domestically some cases have also been successfully applied, but far from universal. The composition and working principle of the KWQ-216 stabilizer are introduced. The safety analysis has been carried out for the failure-prone parts of KWQ -216 stabilizer, such as the shell and spring seat pin, by CAE, which draws that the safety of the tool is higher. The BHA for the stabilizer is described in the paper. The tool is controlled by on-off pump on the ground, and is locked by mechanical means downhole, making diameter adjusting accurate, reliable, and simple to operate. The scientific use of the stabilizer could economically and accurately control the deviation angle and azimuth, which improves wellbore quality, and shortens the drilling cycle.