在油气田的勘探、开发、生产过程中，经常要对油气层进行措施改造或对油气井进行修井作业，每一次作业都要洗井或压井，造成对储层的多次伤害。为了最大限度地减小对油气层的伤害，做到压井液和地层不直接接触、高压油气井不压井作业，研究应用井下液控开关保护油气层工艺技术 In the process of exploration, development and production of oil and gas fields, it is often necessary to carry out measures to reform the oil and gas reservoirs or workover work on oil and gas wells. Each operation requires well washing or well killing, resulting in multiple injuries to the reservoir. In order to minimize the damage to the oil and gas reservoirs and ensure that the kill fluid and the formation are not in direct contact with each other, the high-pressure oil and gas wells are not well-fractured. The application of downhole liquid-controlled switches to protect oil and gas layers