非均质储层三维水平井轨道设计研究与应用

为解决常规定向装备三维水平井施工难题，降低成本，对三维水平井道设计与应用进行了研究。通过分析三维轨道设计模型，对比其优势与不足，优选恒工具面角模型，针对"直-增-扭-稳-增-平"六段制典型轨道，从其基本公式和A靶点约束方程出发，建立了初始方位角模型，根据初始方位角得到造斜率和工具面角，进而计算出其他全部轨道参数，从而完成三维水平井轨道设计。在JH17P36井中应用该方法，采用常规装备施工，矢量中靶，实钻轨迹与设计符合率高，各技术指标优秀。钻井实例表明，计算模型和设计方法是正确、合理和可行的，同时也验证了恒工具面角模型的优越性。

3D Well-path Design for Horizontal Wells in Heterogeneous Reservoirs

The design and practical application of three-dimensional horizontal wells were studied to solve the problem of three-dimensional horizontal well construction using conventional directional equipment and to reduce costs. After analyzing the three-dimensional trajectory design models and comparing their advantages and disadvantages, the optimal constant tool face angle model was selected. Focusing on the six sections that make up a typical well-path (vertical, increasing, twisting, stable, increasing, and horizontal) and starting with the basic equation with the A target as the constraint, an initial azimuth model was established. After obtaining the build-up rate and the tool face angle based on the initial azimuth, the remaining trajectory parameters were calculated to complete the design of the three-dimensional horizontal well trajectory. This method was applied in the JH17P36 well using conventional equipment to obtain the following results:the vector hit the target, the coincidence rate of the actual trajectory and the design trajectory were high, and the technical indicators were excellent. The drilling example results indicated that the calculation model and the design method were accurate, reasonable, and feasible and also demonstrated the superiority of the constant tool face angle model.