适用于高压井中的分支井液动工具研究与应用

Development and Application of the Hydraulic System in High Pressure Multilateral Wells

分支井液压系统的动作成功与否是决定分支井施工成败的重要因素。由于在深井高压环境下泥浆性能与在常规井况下有较大区别,从而导致利用现有标准规定的公差尺寸进行加工的液压零部件在高压井底不能正常动作。针对该问题,对分支井工具的液压部分进行了有限元模拟和室内试验,采用理论与实践相结合的方式优化了工具液压零部件公差配合尺寸。优化后的分支井工具成功应用于哈萨克斯坦肯吉亚克的某套管开窗分支井,解决了井下高压对工具动作的不利影响的难题。

The action of the hydraulic system is an important factor affecting the successful application in multilater- al wells. Because of the performance of drilling fluid in high pressure is different from conventional mud, the hy- draulic part manufacture by the acceptance tolerance in old machining norm could not move in high pressure. In this paper, in order to solve the failure of hydraulic system in high pressure environment, the fit tolerance of the hy- draulic cylinder was optimized based on finite element simulation and external pressure test. The application of the improved tools in a multilateral well of Kazakhstan Kenjiyake, the tool could conquer the adverse effects by high pressure environment and successfully completion.