The new study on broadening measurement range of the oil-based imaging tool
Using the three-dimensional finite element numerical simulation, the effective measurement range of the oil-based mud electrical imaging tool based on the principle of capacitive coupling is studied.Can find though the numerical simulation: the effective measurement range of the oil-based mud electrical imaging tool using 1MHz operating frequency is narrow, that is unfavorable to extract fracture and bedding information.The lower limit of the real part of the apparent impedance signal to the formation resistivity is 5Ω.m, and the lower limit of the apparent impedance modulus signal is 20Ω.m.In the medium and high resistance formation (Rt>200Ω.m), there is a non-linear relationship between the real part of the apparent impedance and the formation resistivity.In the high resistance formation (Rt>2000Ω.m), the modulus of the apparent impedance is not sensitive to changes in formation resistivity.Hence, it is not appropriate to use the real part or modulus of the apparent impedance to convert the formation resistivity alone.Another simulation found that frequency directly affect the effective measurement range.In the high frequency condition, the real part of the apparent impedance is more sensitive to the lower resistance formation.While in the low frequency condition, the real part is more sensitive to the higher resistance formation Based on the above regular patterns, it is preferable to combine the working frequency of 1MHz and 10MHz, and combine the new data processing method named double frequency + splicing to extend the effective measurement range to 0.5 ~ 2000Ω.m.
Oil-Based Mud Electrical Imaging Dual frequency Broad Measurement Range Effective Measurement Range
Chunli Lu Shasha Shan Hanbin Zhu Hong Xiao
CNPC LOGGING, XIAN 710077, Shanxi Prov, China
国际会议
西安
英文
70-79
2017-09-20（万方平台首次上网日期，不代表论文的发表时间）