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The products are widely used in the drilling sites and laboratories of PetroChina, Sinopec, CNOOC, Yanchang Petroleum and other groups, as well as the teaching and laboratories of major petroleum universities and scientific research institutions.
Data Measurement and Calculation of Six-speed Rotary Viscometer
2024-01-24
Adjust the room temperature to 20±5 ℃, and strictly follow the operation steps in Section 2 of this chapter. When measuring at the well site, the sampling delay shall be reduced as much as possible, and the sampling location and conditions shall be recorded on the measurement sheet.
The instrument coefficient is C = 0.511
1. Newtonian liquid absolute viscosity test:
Adjust the rotation speed of the instrument to 300r/min until the reading on the dial is constant and the reading is the absolute viscosity value.
η = 300r/min (reading) mPa · s
2. Viscosity test of plastic fluid:
The rotation speed of the instrument is adjusted to 600r/min, and 1/2 of the reading on the dial is the apparent viscosity value.
Adjust the rotation speed of the instrument to 300r/min. When the reading on the dial is constant, the difference between the reading and the reading of 600r/min is the plastic viscosity.
Stir the drilling fluid for 10 seconds at the rotating speed of the instrument of 600r/min, and the maximum reading value after rotating at the rotating speed of 3r/min is the initial cutting force. The reading value of the final shear force recorded after standing for 10 minutes.
Viscosity: η = × 600 r/min (reading) mPa · s
Plastic viscosity: η plastic = 600 r/min (reading) -300r/min (reading) mPa · s
Dynamic shear force: τ0=0.511(300r/min reading-η plastic) Pa
Static shear force: initial τ = 0.511 × 3r/min (reading) Pa (standing for 1 minute)
τ = 0.511 × 3r/min (reading) Pa (standing for 10 minutes)
3. Pseudo-plastic fluid:
Its flow is characterized by the shear stress begins to flow, but the viscosity decreases with the increase of shear stress, the flow of pseudoplastic fluid obeys the power function, its expression:
Τ = k()n
lgτ= lg k n lg
n: prevalence index. Its value is between 0 and 1
k: Consistency coefficient.
Flow index n = 3.32 lg
Consistency coefficient k = Pa · s n
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It mainly produces drilling fluid and completion fluid analysis instruments. The products are widely used in the drilling sites and laboratories of PetroChina, Sinopec, CNOOC, Yanchang Petroleum and other groups, as well as the teaching and laboratories of major petroleum universities and scientific research institutions.
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