Abstract: Bridge plug fracturing technology is the main technology used for unconventional hydrocarbon reservoirs reconstruction abroad, it can realize volume fracturing of large displacement, large volume of sand and liquid. Tight oil and gas reserves in Ordos basin are abundant. To promote the effective development of the reservoirs and provide technical means for the sustained and stable yield of 50 million tons, by analyzing the reservoir characteristics, equipment capability and natural conditions, Changing Oilfield established an objective that bridge plug could be fast flowback after fracturing, and lower the development cost. By conducting structural design, ground simulation setting and matching experiments, indoor pressure-bearing and milling test, the BIG BORE fast-drilling bridge plug was developed, which featured with “large drift diameter, high pressure-bearing capacity, high heat resistance and fast drilling”. The field application showed that BIG BORE fast-drilling bridge plug could efficiently reconstruct horizontal wells and allow production after fracturing operations without the need for drilling. It provides key technology for the efficient development of tight oil and gas reservoirs in Changqing Oilfield, and has become one of the major technologies for volume fracturing of tight oil in Changing Oilfield. CNPC has authenticated that the technology meets the domestic leading level.

摘要： 桥塞压裂技术是国外非常规油气藏储层改造的主体技术, 可实现大排量、大砂量、大液量的体积压裂。 鄂尔多斯盆地致密油气藏储量丰富, 为推进其高效开发, 为5000×104t 持续稳产提供技术手段, 长庆油田结合储层特 征、设备能力和自然条件等, 以桥塞压后快速返排、满足低成本开发为目标, 通过开展结构设计, 地面模拟坐封匹配 试验、室内承压试验和钻磨试验, 形成了以“大通径、高承压、高耐温及能够快速钻除” 为特点的BIG BORE 快钻桥 塞。经现场应用表明, BIG BORE 快钻桥塞可实现水平井高效改造、压后免钻投产, 为长庆油田致密油气藏高效开发提 供了关键技术手段, 已成为长庆致密油体积压裂主体技术之一, 技术水平国内领先。

关键词: 大通径, 快速钻井, 体积压裂, 桥塞