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Methods for determining in situ the viscosity of heavy oil using nuclear magnetic resonance relaxation time measurements

机译:使用核磁共振弛豫时间测量原位确定重油粘度的方法

摘要

The viscosity η (in centipoise) of a heavy oil sample is determined according to an equation of the form ln; <math overflow="scroll"><mrow><mrow><mfrac><mi>η</mi><msub><mi>η</mi><mi>g</mi></msub></mfrac><mo>=</mo><mfrac><mrow><mrow><mo>-</mo><mi>C</mi></mrow><mo>⁢</mo><mstyle><mspace width="0.3em" height="0.3ex" /></mstyle><mo>⁢</mo><mn>1</mn><mo>*</mo><mrow><mo>(</mo><mrow><mi>T</mi><mo>-</mo><mrow><msup><mi>c</mi><mi>′</mi></msup><mo>⁢</mo><mn>246</mn></mrow></mrow><mo>)</mo></mrow></mrow><mrow><mrow><msup><mi>c</mi><mi>″</mi></msup><mo>⁢</mo><mn>47.10</mn></mrow><mo>+</mo><mrow><mo>(</mo><mrow><mi>T</mi><mo>-</mo><mrow><msup><mi>c</mi><mi>′</mi></msup><mo>⁢</mo><mn>246</mn></mrow></mrow><mo>)</mo></mrow></mrow></mfrac></mrow><mo>,</mo></mrow></math> where T is the temperature of the heavy oil, T2LM is the logarithmic mean of the T2 distribution of the sample obtainable from nuclear magnetic resonance (NMR) measurements, c′=1.0±0.05, c″=1.0±0.04, ηg is the glass transition temperature viscosity of the heavy oil and a function of T2LM, and C1 is a variable which is a constant for the heavy oil and is a function of T2LM. Both C1 and ηg are considered functions of certain NMR values associated with the heavy oil sample, with ηg and C1 preferably estimated by empirically fitting data to the equations ln T2LM=a′+b′ ln ηg and ln T2LM=a″+b″C1, where a′, b′, a″ and b″ are constants.
机译:重油样品的粘度η(厘泊)根据ln公式确定; <![CDATA [<数学溢出=“ scroll”> η η g = - C 1 * T - c ' 246 c 47.10 + T - c < mi>′ 246 ]]> 其中T是重油的温度,T 2LM 是样品的T 2 分布的对数平均值,可通过核磁共振(NMR)测量获得,c' = 1.0±0.05,c''= 1.0±0.04,η g 是重油的玻璃化转变温度粘度,是T 2LM 的函数,而C1是变量它是重油的常数,是T 2LM 的函数。 C1和η g 都被认为是与重油样品相关的某些NMR值的函数,其中η g 和C1最好通过对ln T < Sub> 2LM = a'+ b'lnη g 和ln T 2LM = a” + b” C1,其中a',b',a ”和b”是常量。

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