高温高压油基钻井液乳化稳定性评价装置与方法  

Research on Evaluation Device and Method of Emulsification Stability of High Temperature and High Pressure Oil-based Drilling Fluid

作　　者：龙怀远 陈武[1] 刘罡[1] 王显光[2] 林永学[2] 张顺元 王松[1] LONG Huaiyuan;CHEN Wu;LIU Gang;WANG Xianguang;LIN Yongxue;ZHANG Shunyuan;WANG Song(College of Chemistry and Environmental Engineering,Yangtze University,Jingzhou,Hubei 434023;Sinopec Research institute of Petroleum Engineering,Beijing 100101;China National Petroleum Corporation Engineering Technology Research Institute Co.,Ltd.,Beijing 102206)

机构地区：[1]长江大学化学与环境工程学院,湖北荆州434023 [2]中国石化石油工程技术研究院,北京100101 [3]中国石油集团公司工程技术研究院有限公司,北京102206

出　　处：《钻井液与完井液》2021年第6期738-742,共5页Drilling Fluid & Completion Fluid

基　　金：国家科技重大专项“海上油气田关键工程技术”(2016ZX05033)。

摘　　要：高温高压油基钻井液乳化稳定性评价仪主要由高温高压不锈钢腔体、测试电极、温度控制系统、压力控制系统以及测试系统组成,高温电极选用PEEK材料,测试的电极距离设计为1.5 mm,电极的放电电压最高设计为2000 V,温度控制系统以T89C51单片机为核心,采用铸铝电加热器包裹在高温高压不锈钢腔体外部进行加热,压力控制系统采用液压方式加压。对仪器的稳定性进行了测试并与常温常压下电稳定性测试仪进行了对比,结果表明,该仪器可以实现高温高压油基钻井液乳化稳定性评价,并且测试数据稳定、可靠,测量误差不大于5%。研究了油基钻井液在高温高压下乳化稳定性的规律,当维持压力不变时,随着温度的升高,破乳电压值呈下降趋势;当温度低于120℃时,随着压力的升高,破乳电压值有所减小,当温度达到120℃以上时,破乳电压值基本不随压力的变化而发生改变。The high temperature and high pressure oil-based drilling fluid emulsion stability evaluation instrument is mainly composed of high temperature and high pressure stainless steel chamber, test electrode, temperature control system, pressure control system and test system. The high temperature electrode is made of PEEK material. The test electrode distance is designed to be 1.55 mm. The maximum discharge voltage is designed to be 2000 V, and the voltage change rate is 150±10 V persecond. The temperature control system is based on the T89 C51 single-chip microcomputer. The cast aluminum electric heater is used to wrap the outside of the test vessel for heating. The pressure control system uses hydraulic pressure. The stability test of the instrument and the comparison test with the electrical stability tester under normal temperature and pressure are carried out. The results show that the instrument can realize the evaluation of the emulsion stability of oil-based drilling fluid at high temperature and high pressure, and the test data is stable and reliable, with measurement errors ≤5%. The emulsification stability of oil-based drilling fluid under high temperature and high pressure conditions is studied. When the pressure is kept constant, the demulsification voltage decreases with the increase of temperature. When the temperature is below 120 ℃, the demulsification voltage decreases with the increase of pressure. When the temperature reaches above 120 ℃, the demulsification voltage does not change with the pressure.

关 键 词：油基钻井液 高温高压 破乳电压 评价装置 评价方法 

分 类 号：TE254[石油与天然气工程—油气井工程]