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在大庆油田外围低渗透油藏中,已经发现存在大量天然裂缝,而这些裂缝可以导致注入水沿着裂缝水窜,从而引起生产井含水快速上升,甚至水淹。在低渗透油田,裂缝不仅是油井含水上升的主要原因,而且是提供原油流动的主要通道。为了选择性堵塞裂缝,在低渗透裂缝性油藏中,将研究应用于油田的调剖剂。地震裂缝监测以及示踪剂技术已经应用于描绘裂缝,这些技术可以为选择合适的调驱剂,决定调驱剂的数量以及处理程序提供基础依据。油田测试表明在裂缝性低渗透砂岩油藏中,主要突破的裂缝需要完全堵塞。通过应用这些技术,封闭部分应该适当延伸,这样可以避免有效期短以及无效等问题,而有效期短或无效是由于注入水沿着密封部分附加的薄弱剖面渗漏所致,还可以避免污染微裂缝。这种技术已经大规模应用,其有效率达到100%,平均有效期为一年以及投入产出比达到1:3.97。
In the low-permeability reservoirs outside the Daqing oil field, a large number of natural fractures have been found, and these fractures can cause the injected water to channel along the fractured water, causing the water content of the production wells to rapidly increase or even become flooded. In low-permeability oilfields, fractures are not only the main cause of oil-bearing rise in oil wells, but also provide the main channel for the flow of crude oil. In order to selectively block fractures, profile control agents applied to the field will be studied in low permeability fractured reservoirs. Seismic fracture monitoring and tracer technology have been used to characterize fractures. These techniques can provide a basis for selecting the appropriate transfer agent, determining the amount of transfer agent, and handling procedures. Field tests show that in fractured, low permeability sandstone reservoirs, the major breakthrough fractures need to be completely blocked. By applying these techniques, the closure should be properly extended so as to avoid short effective periods and inefficiencies, while the short or ineffective period is due to the leakage of impingement water along the weak profile of the additional sealing section and to avoid contamination of the micro-cracks. This technology has been applied on a large scale with an efficiency of 100%, an average of one year and an input-output ratio of 1: 3.97.