| 基于线性节流阀的MPD井筒压力调控方法 |
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| 引用本文： | 王果. 基于线性节流阀的MPD井筒压力调控方法[J]. 石油钻采工艺, 2021, 43(2): 197-202. DOI: 10.13639/j.odpt.2021.02.010 |
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| 作者姓名： | 王果 |
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| 作者单位： | 1.页岩油气富集机理与有效开发国家重点试验室 |
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| 基金项目： | 国家重点研发计划“井筒稳定性闭环响应机制与智能调控方法”(编号:2019YFA0708303)；国家科技重大专项“彭水地区常压页岩气勘探开发示范工程”(编号:2016ZX05061-002-001)；中石化科技部攻关项目“精细控压钻井技术完善及推广应用”(编号:P17050-12) |
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| 摘 要： | 针对MPD钻井影响压力调控精度的关键问题,从底层调控硬件到顶层测算模型及调控方法等进行了原创性研究.首先针对现有节流阀难以满足回压精细控制的难题,提出了过流面积轴向动态优化的压降线性调控新理念,并设计出在25％～85％的开度范围内压降随开度线性变化的节流阀;然后针对井筒压力难以准确测算、控制模型复杂等问题,建立了一种实...
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| 关 键 词： | 控压钻井 压降线性调控 回压快速调控 井底压力测算 压力串级控制 |
MPD wellbore pressure control method based on linear throttle valve |
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| Affiliation: | 1.State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing 102200, China2.SINOPEC Research Institute of Petroleum Engineering, Beijing 102200, China |
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| Abstract: | To address the key problems influencing the pressure control accuracy in the process of MPD, this paper carried out original researches from bottom-level control hardware to top-level calculation model and control method. Firstly, in view that existing throttle valves can hardly realize fine back pressure control, a new concept of linear pressure drop control of axial dynamic optimization of open area was put forward, and the throttle valve whose pressure drop varies linearly with the opening in the opening range of 25%-85% was designed. Then, in view that wellbore pressure can be hardly calculated accurately and the control model is complicated, a kind of real-time model coefficient prediction method was established to realize the real-time accurate calculation of bottom hole pressure. Finally, wellbore pressure serials control was realized by means of fast back pressure control, so as to solve the difficulty in the fine wellbore pressure control. Wellbore pressure control module was developed, and the control method was verified by virtue of experiment and application, which showed that the control accuracy of bottom hole pressure is up to 0.2 MPa. The research results provide theoretical and technical support for the fine wellbore pressure control. |
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