Wellhead combination testing device and method for polymer injection well

Abstract

The invention relates to a combined well mouth testing device for a polymer injection well. A high-precision pressure monitor and a continuous liquid level monitor are connected with a three-way valve in a combination mode, and one combined well mouth testing device is installed on a corresponding pipeline of each polymer injection layer. The invention further relates to a testing method, and the testing method includes the following sequential steps that one combined well mouth testing device is installed on the corresponding pipeline of each polymer injection layer; well mouth pressures and liquid levels of all the polymer injection layers are tested at the same time; bottom hole pressure of the corresponding polymer injection layer is calculated according to testing values of the well mouth pressure and the liquid level of each polymer injection layer; a corresponding pressure monitoring well testing model is selected according to the bottom hole pressure of each polymer injection layer; the bottom hole pressures of all the polymer injection layers and the corresponding pressure monitoring well testing models are fitted respectively to obtain well testing interpretation parameters, and the underground viscosity distribution condition of a polymer solution of the corresponding polymer injection layer is solved inversely. The technical scheme solves the problem that pressure testing data is lost due to single well mouth pressure testing.

Description

technical field [0001] The invention belongs to the technical field of oil and gas reservoir exploitation, and in particular relates to a wellhead combination testing device for polymer injection wells and a method thereof. Background technique [0002] Well test analysis is an important means of dynamic monitoring of oil and gas reservoirs. Well test data play a very important role in determining the type of oil and gas reservoirs, describing oil and gas reservoirs, formulating oilfield development plans, and predicting oilfield dynamics. At present, the commonly used test method is shut-in pressure measurement method. This test method needs to install a pressure gauge at the bottom of the well. However, the cost of installing the pressure gauge is huge, and sometimes the pressure gauge cannot be lowered into the bottom of the well due to the influence of the string structure. Therefore, it is proposed A method of converting the wellhead pressure into the bottomhole pressur...

AI Technical Summary

Problems solved by technology

The existing polymer flooding reservoir testing models all describe the polymer solution as a power-law fluid with a constant power exponent, and the polymer viscosity model cannot accurately describe the seepage characteristics of the polymer solution in complex formations

In addition, the effect of polymer flooding depends to a large extent on the viscosity distribution of the polymer solution underground, and the underground situation of polymer flooding is complex, so it is difficult to study the viscosity distribution, and it is impossible to monitor the actual change of viscosity

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