Joint testing device and method of rheological property of polymer solution and relative permeability of core

Abstract

The invention relates to a joint testing device and method of the rheological property of a polymer solution and the relative permeability of a core. The device provided by the invention comprises a polymer injection unit, an oil injection unit, an online rheometer, a core holder, an oil-liquid separator, a pressure difference sensor and an electronic weighing instrument which are connected through pipelines and control valves. The method provided by the invention comprises the following steps: placing a core into the core holder; injecting a polymer solution sample into the core in the core holder by utilizing the polymer injection unit; collecting pressure difference and flow data; computing the viscosity of the polymer solution under different flows; obtaining the rheological curve of the polymer solution by combining the relation of the shear rate and flow in the online rheometer according to the relationship between the shearing rate and flow in the online rheometer; injecting oil by utilizing the oil injection unit to remove the polymer solution out of the core; injecting the polymer solution into the core by utilizing the polymer injection unit so as to remove the oil; in the removing and substituting process, measuring the change of the oil quantity in real time by utilizing the oil-liquid separator, and measuring the change of the total liquid quantity of the oil and the polymer in real time by utilizing the electronic weighing instrument; and finally, computing the relative permeability of the polymer solution and the oil by utilizing the obtained data such as the flow, the oil yield, the solution yield, the pressure difference and time.

Description

technical field [0001] The invention relates to a combined testing device and method for rheology of polymer solution and relative permeability of rock core. Background technique [0002] In the polymer solution phase permeability test, it is necessary to determine the rheology of the polymer solution system. The existing conventional methods are basically to first measure the rheological properties of the polymer solution system with a viscometer such as a rotational viscometer, and then conduct a polymer solution phase permeability experiment. When processing the data, the previously measured rheological data are substituted into the phase permeability model. The phase permeability curve of the polymer solution was obtained from the above. This conventional method has the following three disadvantages: 1) The rheological properties of the polymer solution system are first measured with a viscometer such as a rotational viscometer. During the test, the sample needs to ...

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Problems solved by technology

This conventional method has the following three disadvantages: 1) The rheological properties of the polymer solution system are first measured with a viscometer such as a rotational viscometer. During the test, the sample needs to be taken out and placed in the sample chamber for measurement, which cannot accurately reflect that the polymer has passed through the pores. 2) It is impossible to combine the phase permeability measurement and the rheological measurement, and the online real-time measurement of the rheology of the polymer solution system cannot be performed; 3) Most of the pressure acquisition systems of the phase permeability measurement devices in conventional methods cannot be realized Automatic Data Collection

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