Test method for isotope labeling of water outlet parts of high water-cut horizontal wells

Abstract

The invention provides an isotope labeling test method for a water outlet part of a high-water-cut horizontal well.The method sequentially comprises the steps that 1, isotopes in an isotope releasing device are solidified in a water-soluble carrier; 2, the isotope releasing device and an oil pipe are connected and delivered downwards to a horizontal section of the well; 3, the carrier dissolves and releases the isotopes in downhole water, and the isotope releasing speed has a certain proportion relationship with the water body flow velocity; 4, an oil production pump is started, and a production test starts; 5, gamma spectrum analysis is continuously performed on produced water on the ground, and the water outlet part of the high-water-cut horizontal well is inverted through the variety and characteristic content of the detected isotopes.According to the method, due to the fact that the isotope releasing device is delivered by adopting the oil pipe, various well track and well shaft condition limitations can be overcome, and the operation risk is reduced; the method can be achieved during pump inspection operation without needing cooperation of tools such as a packer, a bridge plug and an underground switch, the platform occupation time can be shortened, and therefore the well logging cost is saved.

Description

technical field [0001] The invention belongs to the technical field of petroleum well logging devices, and in particular relates to an isotope labeling testing method for water outlet parts of high-water-cut horizontal wells. Background technique [0002] Accurate water outlet location diagnosis (also known as water detection test in the industry) is the basis and key to water control and oil stabilization in high water-cut horizontal wells, and it is also a long-standing problem in the production and management of horizontal wells at home and abroad. At this stage, we can only rely on the foreign cable testing method of "downhole crawler + holdup meter + multi-parameter instrument". However, through application, it is found that this method also has disadvantages such as difficulty in going down in complex drilling trajectories of horizontal wells, difficulty in passing in complex wellbores, high testing costs, difficulty in large-scale application by domestic companies, an...

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Problems solved by technology

[0003] In order to overcome the disadvantages of difficult implementation and high cost in the testing of water outlet parts of high water-cut horizontal wells in the prior art, the present invention provides a method for isotope labeling testing of water outlet parts of high water-cut horizontal wells

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