为了破解溢漏同层等复杂井况下不易准确求取关井立管压力（以下简称关井立压）的难题，采用理论与实际相结合的研究方法，通过分析影响关井立压求取的各项因素，结合四川盆地MX145、ST1、HS101等井的溢流处置实例，探讨了复杂井况下关井立压求取的方法与经验。研究结果表明：①在钻井液“窄密度窗口”地层发生溢流关井的井，关井后井筒内压力上升，极易憋漏地层，导致无法使用常用的憋压法来求取关井立压，该种情况下可以使用循环法求取关井立压，或者分析立压、套压变化曲线，结合邻井地层压力，推算出溢流井当前地层压力的可能范围值；②在使用憋压法求取关井立压时，要注意读取压力的时机，正确的做法是读取停泵时的立压、套压，而不是读取停泵前的压力值；③对于存在多个地层压力系数的长裸眼井段，关井立压可能并不能真实地反映当前的地层压力，可以通过做承压能力试验、提前释放地层能量、精细控压钻井等方式，尽量避免出现漏转溢等复杂井况。结论认为：复杂井况下，尽管求取关井立压确实存在着一定的难度，但仍可以通过准确计算井筒内静液面高度及正确解读井口压力的变化细节，分析得到较为准确的关井立压值，为井控处置和压井施工提供可靠的依据。

To address the challenge of accurately determining shut-in drill pipe pressure (SIDPP) under complex well conditions such as a layer with simultaneous overflow and lost circulation, a research method integrating theory with practice was adopted. By analyzing key factors affecting SIDPP determination and overflow treatment cases from Wells MX145, ST1, and HS101 in the Sichuan Basin, this study discussed the methods and experiences for determining SIDPP under complex well conditions. The following research results are obtained. (i) For wells that are shut due to overflow in the formation with narrow drilling fluid density window, the post-shut-in pressure buildup in wellbore easily leads to lost circulation, making the conventional pressure buildup method fail in determining the SIDPP. In this case, the circulation method is recommended; or, the possible range of formation pressure for the overflow well is estimated by analyzing the drill pipe/casing pressure curves, combined with the data from offset wells. (ii) When the pressure buildup method is used to obtain SIDPP, the time to read the pressure is a key consideration, that is, the drill pipe/casing pressures at the time of pump shut-down, rather than the value before pump shut-down, should be recorded. (iii) For long open-hole sections with multiple formation pressure coefficients, the SIDPP may not truly reflect the current formation pressure, and the complex well conditions such as lost circulation-to-overflow transition can be mitigated or prevented through pressure-bearing capacity test, preemptive formation energy release, and managed pressure drilling techniques. The study concludes that SIDPP determination is somewhat challenging under complex well conditions, but accurate calculation of the static liquid level height within the wellbore and proper interpretation of wellhead pressure variation enable the derivation of relatively accurate SIDPP value, providing a reliable basis for well control and kill operations.