苏里格气田区小井眼二开水平井优化设计

小井眼二开水平井具有周期短、节省钻井成本的优点,但在钻进过程中会出现的井眼轨迹控制难、机械钻速慢、井壁易垮塌和易发生井漏等问题,针对上述问题对小井眼水平井进行井身结构设计、井眼轨道优化设计、钻具组合优选、钻井液配置。井身结构的设计采用自下而上的设计原则,确定井身结构为小井眼二开水平井,二开结构可以减少下钻次数,缩短钻井周期;井眼轨迹设计采用五段制中的“直-增-稳-增-水平”井眼轨道设计,增加稳斜段弥补造斜不足的问题;井眼轨迹的控制应用旋转导向钻井技术,提高井眼轨迹控制准确度;最后对钻井液进行研究分析,优选聚合物钻井液提高井壁稳定性。解决了井眼轨迹控制、机械钻速慢、井壁稳定问题。

Optimization design of second spud horizontal Wells with small hole in Changqing Oilfield

Slim-hole second spud horizontal well has the advantages of short cycle and save drilling cost but will appear in the process of drilling hole trajectory control difficult, slow rate of penetration and borehole wall collapse and lost circulation problems, according to the above problem of slim-hole horizontal well casing program design, borehole trajectory optimization design, assembly, drilling fluid configuration. The design of well body structure adopts the bottom-up design principle, and the well body structure is determined as second spud horizontal Wells with small holes. The second spud structure can reduce the number of trips and shorten the drilling cycle. In the design of borehole track, the five-stage system of "straight-accret-steady-accret-horizontal" borehole track was adopted, and the steady section was added to make up for the lack of deviation. Rotary steerable drilling technology is used to improve the accuracy of well trajectory control. Finally, polymer drilling fluid was selected to improve wellbore stability. The problems of wellbore trajectory control, slow drilling speed and wellbore stability are solved.