Wellhead combination testing device and method for water injection well

Abstract

The invention relates to a combined wellhead testing device for an injection well. A high-precision pressure monitor and a continuous liquid level monitor of the combined wellhead testing device are connected with a three-way valve in a combined way; and the combined wellhead testing device is mounted on a pipeline of an injection layer. The invention further relates to a combined wellhead testing method. The combined wellhead testing method sequentially comprises the following steps: inspecting airtightness of the combined wellhead testing device, and mounting the combined wellhead testing device on the pipeline of the injection layer; closing the injection well, and testing the wellhead pressure and the liquid level of the injection layer; according to test values of the wellhead pressure and the liquid level of the injection layer, calculating the well bottom pressure of the injection layer; according to the well bottom pressure of the injection layer, selecting a corresponding pressure monitoring well test model; fitting the well bottom pressure of the injection layer with the corresponding pressure monitoring well test model to obtain well test interpretation parameters, and through the well test interpretation parameters, judging waterflood front position or analyzing a high-permeability strip. Through the technical scheme, the problem of missing of pressure testing data, caused by independent wellhead pressure testing, can be solved.

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 water 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 pressure ...

AI Technical Summary

Problems solved by technology

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 bottomhole pressure by testing the wellhead pressure

However, for some high-permeability reservoirs, there is another serious problem in wellhead pressure measurement, that is, the liquid level drops rapidly after shutting in the well, which will result in no pressure data monitored at the wellhead, resulting in incomplete pressure measurement data

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