【摘要】 针对现有仪器无法满足超高温高压流变性测试需求的问题,研制了超高温高压流变仪,该仪器主要由工控机、黏度测量系统、温度控制系统、压力控制系统4个部分组成。在研制工程中,通过一种非接触式黏度测量方法解决了测试腔体密封问题,通过独特的温控算法和介质切换冷却技术实现了大跨度温度范围内的精确温控和高效冷却。该超高温高压流变仪可以在模拟钻井温度、压力、钻头转速的条件下测量样品黏度,最大测试压力为220 MPa,最高测试温度为320℃,最低测试温度为-20℃。使用该超高温高压流变仪对钻井液样品进行了恒压变温以及恒温变压流变性测试,结果证明该仪器可以测量水基和油基钻井液在超高温高压条件下的流变性,可用于深井、超深井钻探用钻井液体系优化。更多还原

【Abstract】 Rheometers presently available cannot satisfy the needs of rheology measurement at ultra-high temperatures and ultra-high pressures. To resolve this problem, a rheometer for use at ultra-high temperatures and ultra-high pressures has been developed, which is composed of four subsystems: an industrial computer, a viscosity measuring unit, a temperature control unit and a pressure control unit.This rheometer can be used to measure the viscosity of a sample at simulated downhole temperature, pressure and rotational speed of drill bit, the maximum pressure for the measurement is 220 MPa, and the temperature for the measurement is in a range of-20 ℃-320 ℃.The sealing of the measuring chamber is resolved using non-contact viscosity measuring method. Using a unique temperature control algorithm and media switching cooling technique, the viscosity can be measured in a very wider temperature range and efficient cooling can be realized during viscosity measurement. Some drilling fluid samples have been tested on this rheometer at constant pressure changing temperatures and constant temperature changing pressures. The test results showed that this rheometer can be used to measure the rheology of water base drilling fluids and oil base drilling fluids at ultra-high temperatures and ultra-high pressures, the measured data can be used in optimizing drilling fluid properties.更多还原