酸化与加砂压裂协同作业技术及其优势

Acidizing and Sand Fracturing Technique and Its Advantages

酸化和加砂压裂是有效的增产技术措施:酸化主要是通过解除孔隙、裂缝中的堵塞物质,或扩大沟通地层原有的孔隙、裂缝,提高地层的渗透性能;加砂压裂主要通过水力作用在地层中形成人工裂缝,再加砂支撑裂缝,提高地层的导流能力。为了充分发挥酸化和加砂压裂的技术优势,需要酸化和加砂压裂协同作业。为使酸化与加砂压裂能较好地协同作业,更加全面地发挥技术优势,将酸化与加砂压裂协同作业技术体系划分为间接协同和直接协同两大系列,并通过施工范例分析了多种类型酸化与加砂压裂协同作业的技术特色、作用原理,对于扩大推广应用领域和范围,促使技术攻关深层次选向具有重要意义。

Acidizing and sand fracturing are two effective stimulation practices. The acidizing works mainly by removing plugging materials inside pores and fractures or by enlarging built-in fracture and pore sizes so as to increase pay zone permeability. The sand fracturing is supporting induced fracture by hydraulic power with sand to improve formation flow conductivity. The combination of acidizing and fracturing is divided into two series, direct combination and indirect one. A lot of field cases were used to analyze technical features and working mechanism of various combination practices, which is very important for using this technique widely.