高温快速地层压力测试仪研制与应用

Development and Application of High Temperature Rapid Formation Pressure Testing Instrument

随着勘探井向深井领域发展,高温深地深海小直径井眼油气的开发成为必然。快速地层压力测试仪是通过对地层压力测量来分析计算地层渗透率及储层有效性的仪器,但现有仪器不能满足4.5in*小直径井眼及耐温205℃的作业要求,测压时抽吸速度不可控,无法实现恒流抽吸,导致测压精确度低。高温快速地层压力测试仪各功能短节模块化设计,其液压动力与精密抽吸短节高度集成、推靠坐封短节结构紧凑,这使仪器的长度和直径得以减小;采用耐高温电子元器件和高温厚膜封装技术,实现仪器耐温205℃的技术指标;采用直流无刷电机精密控制技术实现对超低渗透率等复杂地层流体的恒流抽吸、精准测压。高温快速地层压力测试仪经过高温和可靠性测试及实井作业验证,该仪器具有尺寸小、集成度高、可靠性好、耐高温的优点,解决了高温复杂井况测压问题,具有较好的应用前景。

With the development of exploration wells to deep wells,the development of oil and gas of small diameter wells in high temperature deep sea has become inevitable.Rapid formation pressure tester is for analyzing and calculating formation permeability and reservoir effectiveness by measuring formation pressure.However,the existing instrument can not meet the operation requirements of 4.5in small diameter well and temperature resistance of 205℃.The suction speed is uncontrollable and the constant flow suction can not be achieved during pressure measurement,resulting in low pressure measurement accuracy.The modular design of each functional short section of the high-temperature rapid formation pressure tester,with its hydraulic power highly integrated with the precision suction short section,and the compact structure of the pushing and sealing short section reduces the length and diameter of the instrument.The high temperature electronic components and high temperature thick film packaging technology are adopted to achieve the technical index of temperature resistance of 205℃.The precision control technology of DC brushless motor is adopted to achieve the constant flow suction and precision pressure measurement of complex formation fluids such as ultra-low permeability.The high temperature rapid formation pressure tester has been verified by high temperature and reliability tests and real well operations.The instrument has the advantages of small size,high integration,good reliability and high temperature resistance.It solves the pressure measurement problem of complex well conditions at high temperature,and has a promising application prospect.