Detection method for oil well unstable-state continuous moving fluid levels

Abstract

The invention relates to the technical field of oil well detection, in particular to a detection method for oil well unstable-state continuous moving fluid levels. The detection method comprises the following steps that when an oil well is in an unstable state that the oil well is firstly stopped and then started for a period of time, oil well change characteristics presented by digital acquisition indicator diagrams are identified, and according to identification results, at least five groups of first characteristic indicator diagrams, second characteristic indicator diagrams and third characteristic indicator diagrams formed by the oil well change characteristics are acquired; the characteristic indicator diagrams are processed, given known parameters are checked, and whether a conventional test indicator diagram, in a stable state, of a conventional test and moving fluid level data corresponding to the conventional test indicator diagram exist or not is judged; if yes, by means of the time relationship, the moving fluid levels corresponding to three-dimensional points are calculated backward point by point; and if not, in combination with the seepage mechanics darcy law and theoil well pump-oil pipe discharge relation, moving fluid level values in each time period are obtained through an integral method. According to the detection method, the accuracy of online metering ofthe liquid amount of a rod-pumped well is improved, and the system operation cost is reduced.

Description

technical field [0001] The invention relates to the technical field of oil well detection, in particular to a method for detecting the unsteady continuous dynamic liquid level of an oil well. Background technique [0002] In the prior art, the acquisition of dynamic liquid level data of oil wells mainly relies on the traditional echo method for testing. Generally, it is necessary to stop the well, load the gun, stimulate and record the liquid level wave, and process the data to obtain the liquid level value. The whole process takes at least 10 minutes or even longer, that is to say, a certain amount of production time will be sacrificed in order to obtain a liquid level data. At the same time, the operation process relies on manual labor, and there are obvious safety hazards. In the digital age, the industry has introduced a continuous liquid level test device, which mainly relies on ground nitrogen tanks to periodically emit pulses, record echoes, process data, and give liq...

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Problems solved by technology

[0004] The invention provides a method for detecting the unsteady continuous dynamic fluid level of an oil well, so as to overcome the problem in the prior art that the dynamic fluid level result can only be obtained by relying on the steady state static condition, which leads to the inability to accurately detect the fluid level under the unsteady condition. The results of dynamic liquid level, and then can not accurately grasp the defects of oil well working conditions

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