Method and device for determining implicit abnormal oil well

Abstract

The invention provides a method and device for determining an implicit abnormal oil well, and belongs to the technical field of oil field oil extraction. The method comprises the following steps: based on known parameters such as oil layer flow pressure, oil layer permeability, pump setting depth, crude oil viscosity and the like, determining the theoretical daily liquid production of an oil wellthrough a relation formula among the working fluid level variation of the oil well, the oil layer liquid supply amount, the oil well pump leakage amount and the theoretical daily liquid production ofthe oil well; comparing the theoretical daily fluid production capacity of the oil well with the actual daily fluid production capacity of the oil well; if the ratio of the actual daily fluid production of the oil well to the theoretical daily fluid production of the oil well is less than or equal to a target threshold; judging the oil well as a hidden abnormal oil welland carrying out pump detection operation, so that pump detection operation can be carried out on a hidden abnormal oil well in time, the 'sick' production time of the hidden abnormal oil well is shortened, the oil well yield isrecovered as soon as possible, and the purpose of improving the total yield between two times of pump detection construction, field oil well application for more than 300 times and average single-well annual oil increase by 216 tons are achieved.

Description

technical field [0001] The present application relates to the field of oil recovery technology, in particular to a method and device for determining hidden abnormal oil wells. Background technique [0002] Usually, the oil and gas field mining enterprises carry out the pump inspection construction on the oil well, which is carried out under the condition that the oil well does not produce liquid at all. The lifting equipment commonly used in oil well production includes "pumping unit + tubular pump", "pumping unit + rod pump", "surface driven downhole screw pump", "electric submersible pump", "electric submersible screw pump", etc. However, during the production process of the oil well, the production is often affected by the oil well's liquid supply capacity, pump and / or tubing slight leakage, and the production gradually decreases, resulting in the oil well producing with disease for a period of time, resulting in reduced pump efficiency and loss of production. We define ...

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Problems solved by technology

[0005] These technologies use the production inspection pump chart to determine the timing of oil well pump inspection, but they only consider from the perspective of economic benefits, and do not consider factors such as dynamic fluid level or submergence, oil layer flow pressure, oil layer permeability, pumping depth, crude oil viscosity and other factors that affect production. The impact of liquid volume, under the low oil price, it is not enough to consider only economic benefits

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