沁水盆地深部煤储层具有低渗-特低渗、局部高饱和、低孔隙度、高热演化程度的地质特征，在直井/水平井+大规模压裂的开发模式下，需要与之相适应的完井技术才能保证储层改造和后期生产效果。文章系统分析煤层气开发水平井常规单层套管完井技术、裸眼/筛管完井技术、套管+滑套完井技术的不同井身结构和井下工具类型，并对不同完井技术的适用条件和技术特点进行了论述。研究结果表明，常规单层套管完井技术施工工艺成熟，三开完井结构应用普遍，但不利于降本增效；二开完井结构仅适用于煤储层上覆地层较为稳定、无含水层或微弱含水层的地质条件；裸眼/筛管完井技术可减少煤层段的污染，但无法进行后期储层改造，适用于煤体结构完整、煤层渗透性强的储层；套管+滑套完井技术可省去压裂前的射孔作业，但井下工具的正常运行无法保障且后期压裂排量受到限制。针对U型开发井组中的生产直井，在井筒无法满足大规模压裂作业的前提下，提出了新型双层套管完井技术，该技术的原理是在老井筒中根据地质条件和老井特点通过优选套管和固井工具来重塑井筒，满足后期压裂工艺和保证压裂改造效果。其特点主要是在目的煤层顶板以上采用了水泥封固，配合高抗压、较大内径套管，使井筒能够满足高施工压力的大规模压裂，同时煤层段选用筛管，节约了射孔费用，还可有效避免排采阶段地层坍塌掩埋井筒煤层段。该技术在沁水盆地深部煤储层成功应用，试验成果表明其能够满足深部煤层气大规模、高施工压力下的压裂作业，具有推广前景。

The deep coal reservoir in Qinshui Basin has the geological characteristics of low permeability to ultra-low permeability, local high saturation, low porosity and high thermal evolution degree. Under the development mode of vertical well/horizontal well + large-scale fracturing, it is necessary to adapt the completion technology to ensure the reservoir reconstruction and late production effect. This paper systematically analyzes the different well structure and tool types of conventional single casing completion technology, open hole/screen completion technology, casing + slip-sleeve completion technology, and discusses the applicable conditions and technical characteristics of different completion technologies. The results show that the conventional single-casing completion technology is mature, and the three-way completion structure is widely used, but it is not conducive to cost reduction and efficiency increase. The second well completion structure is only applicable to the geological conditions where the overlying strata is relatively stable and there is no aquifer or weak aquifer. Open hole/screen completion technology can reduce the pollution of coal section, but it can not carry out late reservoir transformation, and is suitable for the reservoir with complete coal structure and strong permeability of coal seam. Casing + slip-sleeve completion can eliminate perforation before fracturing, but the normal operation of downhole tools is not guaranteed and the fracturing rate is limited in the later stage. For producing vertical Wells in U-shaped development Wells, a new double-casing completion technology was proposed on the premise that the wellbore could not meet large-scale fracturing operations. The principle of this technology is to reshape the wellbore by selecting casing and cementing tools according to geological conditions and characteristics of the old wellbore, so as to meet the late fracturing process and ensure the fracturing reconstruction effect. It is mainly characterized by the use of cement sealing above the roof of the target coal seam, with high pressure resistance and large inner diameter casing, so that the wellbore can meet the large-scale fracturing of high construction pressure. At the same time, the selection of screen pipe in the coal seam saves the perforation cost, and can effectively avoid the formation collapse and bury the coal seam in the drainage stage. The technology has been successfully applied in deep coal reservoirs in Qinshui basin, and the test results show that it can meet the needs of deep coalbed methane fracturing operations under large scale and high construction pressure, and has the prospect of popularization.