古龙页岩油GY15-Q8-H1井优化二开实践与认识

Practice and recognitions of optimizing the second spudding of Well GY15-Q8-H1 of Gulong shale oil

摘要:

松辽盆地北部古龙页岩油开发以来，受地层地质特点影响和钻井技术限制，试验区水平井均采用三层套管井身结构，2000~2500 m水平段长水平井二开?311.2 mm井眼一趟钻比例100%，?215.9 mm井眼一趟钻技术由初期的造斜段和水平段分别一趟钻，逐渐过渡为造斜段+水平段一趟钻。随着页岩油?215.9 mm井眼钻井技术的完善，为进一步缩短钻完井周期，降低钻井投资，综合考虑邻井气顶气、浅层气发育情况和破裂压力等情况优选在GY15-Q8-H1井进行了三开变两开和二开?215.9 mm井眼一趟钻应用实践。本文详细阐述了GY15-Q8-H1井优化设计过程，技术难点、风险与对策实践认识，为页岩油三开变两开钻井技术的完善，降低钻井施工复杂提供了可借鉴经验。

Abstract:

Since the development of Gulong shale oil in the northern Songliao Basin， due to the geological characteristics of the formation and the limitation of drilling technology，the horizontal wells in the test area all adopted three-layer casing well structure， and the 2000~2500m horizontal section of long horizontal wells have a 100% “one-trip drilling” ratio in ?311.2mm boreholes. The “one-trip drilling” technology of the ?215.9mm boreholes has gradually transited from the initial “one-trip drilling” of the inclined section and the horizontal section respectively to that of the inclined section+horizontal section. With the improvement of drilling technology of shale oil wells’ ?215.9mm boreholes， in order to further shorten drilling and completion period and reduce drilling investment， the application and practice of three-spudding to two-spudding and “one-trip drilling” of ?215.9mm hole was optimized in Well GY15-Q8-H1. In this paper， the optimization design process， technical difficulties， risks and practical understanding of countermeasures of Well GY15-Q8-H1 well are described in detail， which provides a reference for the improvement of shale oil three-spudding to two-spudding drilling technology and the reduction of drilling construction complexity.