Intelligent storing and taking method and device for oil field downhole formation fluid

Abstract

The invention discloses an intelligent storing and taking method and device for oil field downhole formation fluid. The method comprises the steps that the downhole formation fluid is drawn, and is detected in real time under a shaft; when the result shows that the downhole formation fluid is not true downhole formation fluid, the original state is maintained; when the result shows that the downhole formation fluid is true downhole formation fluid, the true downhole formation fluid is stored; after the true downhole formation fluid is fully stored, the redundant true downhole formation fluid is detected again in real time; and when the result determines that the downhole formation fluid is true downhole formation fluid again, the stored true downhole formation fluid is lifted to the earthsurface, and therefore a sample is obtained. The device is mainly composed of a first solenoid valve, a second solenoid valve, a downhole water content tester, a downhole sample storing cylinder and aone-way valve, wherein the a pipeline where the first solenoid valve is located is connected with a pipe where the second solenoid valve, the downhole sample storing cylinder and the one-way valve inparallel, and the pipeline connected in parallel is connected with the downhole water content tester in series. According to the intelligent storing and taking method and device, online real-time detection can be achieved, the effectiveness of sampling is enhanced, meanwhile, the true formation fluid is automatically recognized and stored, and sampling efficiency is improved.

Description

technical field [0001] The invention relates to oil field exploration technology, in particular to an intelligent access method and device for downhole formation fluid in an oil field. Background technique [0002] In the process of petroleum exploration and production, especially when the oil production well enters the later stage of production, the water content of the oil well increases and the pressure of each oil layer changes. It is urgent to test each formation fluid in the underground reservoir to obtain an accurate water content of the formation fluid sample. Rate and pressure parameters and other indicators can provide reliable analysis data for further mining. The current sampling method is mainly to use the traditional surface pumping unit to extract the multi-layer mixed liquid in the downhole, and after being pumped to the ground, put it into a sample storage bottle, and then send it to the laboratory for laboratory analysis. [0003] The above-mentioned prior...

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Problems solved by technology

[0003] The above-mentioned prior art faces the following problems: firstly, the formation fluid taken out by the sampling device is a multi-layer mixed liquid downhole in the oil field, not a single-layer, real formation fluid, and it is impossible to accurately identify a single-layer oil and gas reservoir downhole based on test data

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