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Indoor Research on Water Lock Damage Removal in Low Permeability Reservoir
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Key Words:Water lock damage; Water lock removal agent; Interfacial tension; Low permeability
Abstract: Conducted are researches on water lock damage removal in view with the formation damage caused by water lock in low permeability reservoir, analyzed is the mechanism and cause of oil well water lock damage, developed is a highly efficient water lock removal agent according to interfacial activities and demulsification performance, studied and analyzed are its preparation methods, performance evaluation and water lock damage removal experiment data and the obtained results show that the product can effectively reduce the interfacial tension between oil and water and make the tension reach up to 6.089×10-3 mN/m and has good demulsification performance, its demulsification rate to simulated crude oil emulsion can reach more than 90 % within three hours, and core physical model experiments demonstrate that permeability recovery rate of water lock damage removal agent to the damaged core can reach more than 85 % and the agent can effectively remove emulsification congestion and damage of water lock effect to the formation permeability.
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