关键词: 分段多级, 分簇射孔, 多级点火, 电缆泵送, 智能选发, 桥塞坐封

Abstract: Unconventional oil and gas reservoirs of shale gas and compact oil and gas are low in porosity and permeability as well as difficult for production. They have higher requirements on exploration and development process technology. The layered multi-stage cluster perforation is the most effective oil testing and completion method at the present time. Under the condition that the wellbore is effectively communicated with the formations, this technology sends perforation pipe string and compound bridge plug to the target layer by means of wire transmission according to the pump design program. The intelligent selective excitation can complete bridge plug setting in connection to cluster perforation. The tool includes four main systems - bridge plug layered system made of easy-to-drill compound material, selective-exciting cluster perforation system, horizontal well pump system and high-pressure sealed wire BOP system - and three main software - selective exciting control software for cluster perforation, design optimization software for pump program and cluster perforation standardization software. There are five specifications and types. Perforation of 20 stages can be excited when the wire is tripped in at one time. The materials of cluster perforation tool can resist 150°C temperature and 140MPa pressure while compound bridge plug can resist 150°C and 70MPa. The wire wellhead BOP has a maximum working pressure of 105MPa. Application of the tool is accumulated to more than 400 well times with a 100 percent service success rate. It reduces the cost by 30 percent and improves efficiency more than two times, providing technological support for cost-effective development of unconventional oil and gas reservoirs.

Key words: layered multi-stage, cluster perforation, multi-stage excitation, wire pump, intelligent selective excitation, bridge plug setting