An experimental setup for continuous evaluation of high temperature and high pressure fluid viscosity and shear stability

Abstract

The invention discloses an experimental device for continuously evaluating viscosity and shear stability of a high-temperature and high-pressure fluid. The experimental device comprises a controller unit, a pump set, a valve set, an intermediate container set, a pressure gauge set, a long pipeline group, an adaptor group, a capillary pipe and a constant temperature oven; the sample rheological property of the fluid under the high temperature and high pressure conditions can be monitored through a long pipeline group pressure testing system; two sets of spiral pipe pressure testing systems are connected in series through the capillary pipe, therefore, a shear effect of an oil reservoir porous medium on the fluid can be simulated, and the rheological characteristics generated after the fluid is sheared can be measured; samples pass through the capillary pipe multiple times, and the rheological characteristics obtained after the fluid is sheared multiple times are stimulated, so that the shear stability of the fluid under the high temperature and high pressure conditions is evaluated. According to the experimental device, the viscosity and the shear stability of multiple fluids such as formation fluids, polymers, gel systems and foam can be quantitatively characterized, and a more stable testing platform is provided for research on the rheological characteristics of the fluids under the high temperature and high pressure conditions.

Description

technical field [0001] The invention relates to a simple experimental device for evaluating the viscosity and stability of a fluid under high temperature and high pressure conditions, belonging to the field of oil and gas field development. Background technique [0002] In the field of petroleum exploration and development, the flow characteristics of fluids under formation conditions have always been one of the most concerned issues for staff. The flow state of formation fluid itself under reservoir conditions and the shear stability of injected fluids (water, polymers, foams and gels, etc.) in porous media are both important and difficult points in the reservoir development process. [0003] In the conventional rheological testing process of formation fluids, for formation fluids, it is usually used to first mix samples through a sampler, test that the gas-liquid ratio and bubble point pressure of the fluid meet the formation conditions, and then pass constant speed and co...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the sample transfer process takes a long time and requires high heat preservation and pressure-holding performance of the equipment during the sample transfer process; in addition, for ultra-heavy oil samples with extremely high viscosity, its viscosity is high, and it is difficult to measure its properties by rheometer. Viscosity at high pressure

However, the disadvantage of this method is that this type of rheometer usually transfers the sample into the experimental platform through a manual pump, so different pressures are achieved through the accumulation of different sample quantities, because the test samples are under different pressure conditions The rheological properties under different conditions are different, the absolute amount of samples is different, and the longitudinal comparability of the test results is lacking.

[0010] On the basis of the fluid viscosity formula established by Frank T.H. et al., the present invention proposes an experimental device capable of evaluating the viscosity and shear stability of fluids on-line under high temperature and high pressure conditions, so as to overcome the current problems of various fluids under high temperature and high pressure. Defects during testing under conditions

Images