基于地层溢流能量的压井方式选择方法

The method for well-killing selection considering the formation overflow energy

陶振宇 樊洪海 刘玉含 叶宇光 邓嵩 罗胜

TAO Zhenyu FAN Honghai LIU Yuhan YE Yuguang DENG Song LUO Sheng

中国石油大学(北京)石油工程学院 中国石油集团工程技术研究院有限公司 常州大学石油工程学院 中国石油华北油田分公司巴彦勘探开发分公司

College of Petroleum Engineering, China University of Petroleum(Beijing), Beijing 102249, China CNPC Engineering Technology Research and Development Company Limited, Beijing 102206, China College of Petroleum Engineering, Changzhou University, Changzhou 2131643, Jiangsu, China Bayan Exploration and Development Branch, Huabei Oilfield Company, PetroChina, Bayannur 015000, Inner Mongolia Autonomous Region, China

深井超深井等深层区域地质情况复杂，发生溢流后需及时关井并选择合理的压井方法，重新建立井下压力平衡。目前溢流后压井方法难以科学选择，为此建立了一种基于定量评价地层溢流能力的压井方式选择方法。借鉴地层能量的定义，提出了地层溢流能量的概念，其物理意义为单位压差下溢流流体的功率，建立了地层溢流能量计算模型，定量评价地层溢流能力的大小，并综合考虑井底压差等因素，以压回法最大允许压力以及临界地层溢流能量为评价指标，提出了压井方法的选择标准。该方法经过塔中地区溢流井的检验，适用性广，准确率达到93.75%，对现场选择压井方法、实现安全钻井具有指导意义。

The geological conditions in the deep and ultra-deep wells are complex, high temperature and pressure may cause overflow. After the overflow, the well needs to be shut down in time, and the appropriate well killing mode should be selected to re-establish the downhole pressure balance. In order to provide a scientific quantitative selection method, this paper presents a well killing selection method based on quantitative evaluation of overflow capacity. In this paper, the concept of formation overflow energy is proposed, which represents the power of overflow fluid under specific pressure differential. Furthermore, the formation overflow energy computation model is established to evaluate the formation overflow capacity quantitatively. Finally, the selection criterion of well killing method is given, with the pressure return method and the maximum allowable pressure and the critical flow overflow energy as the evaluation index. This method has been tested in the overflow well in middle Tarim region, with wide applicability and an accuracy of 93.75%, which is of guiding significance for selecting the well killing method on site and realizing safe drilling.

10.13639/j.odpt.202302015