深层非常规油气固井材料发展现状及趋势浅析

Analysis on development status and trend of new cementing materials for deep unconventional oil and gas

深层页岩油气、煤岩气等非常规油气资源在中国能源版图中地位愈发重要,是未来中国国内能源保供的兜底资源。由于非常规油气资源普遍致密低渗透、无自然产能,需要通过大规模压裂营造人造油气藏,实现资源效益开发。由于深层非常规油气资源应力高、压裂施工规模大,极易出现套变、固井水泥环封隔失效等情况,严重制约资源开发效率,而优化固井材料、提升固井质量是保证井筒服役的重要抓手和现实手段。通过对非常规油气固井材料研发现状回顾,明确深层非常规油气开发中对固井材料抗压强度、防窜效果、抗裂能力、抗冲击韧性等内在需求,不断优化复合固井材料,发挥其不同尺度上的协同作用,同时将固井材料与智能化技术深度有机结合依然是未来深层非常规油气藏开发固井材料发展的主要方向。

Unconventional oil and gas resources such as shale oil and gas,coal and rock gas are playing an increasingly important role in China's energy landscape,and are the guarantee resources for domestic energy supply in the future.As the unconventional oil and gas resources are generally tight and low permeability without natural productivity,it is necessary to create artificial oil and gas reservoirs through staged fracturing of large-scale horizontal wells to realize resource efficient development.Due to the high stress of deep unconventional oil and gas resources and the large scale of fracturing construction,it is easy to form casing change and cementing cement ring sealing failure,which seriously restricts the efficiency of resource development.Optimizing cementing cement materials and improving cementing quality are important starting points and practical means to ensure the service of the wellbore.By reviewing the research and development status of unconventional oil and gas cementing materials,strengthening the internal needs of unconventional oil and gas development for cementing materials,such as compressive strength,anti-channeling effect,crack resistance,impact toughness,etc.,constantly optimizing composite cementing materials,and giving play to their synergistic effects at different scales.At the same time,the deep organic combination of cementing materials and intelligent technology is still the main direction of the development of deep unconventional cementing materials in the future.