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

Abstract

The invention provides an isotope labeling test method for a water discharge part of a high-water-content horizontal well. The method sequentially comprises the steps of a, solidifying isotopes, in an isotope release device, in a water-soluble carrier; b, connecting the isotope release device with an oil pipe and lowering the oil pipe to a horizontal section of the well; c, dissolving the carrier in water at the bottom of the well to release the isotopes at a speed, wherein the speed forms a certain proportional relation with the flow speed of a water body; d, starting an oil production pump for starting a production test; and e, continuously performing gamma spectrum analysis for produced water on the ground and inverting the water discharge part of the high-water-content horizontal well through the types and characteristic content of the obtained isotopes. According to the method, the oil pipe is adopted for conveying the isotope release device, so that various well tracks and shaft condition limitations can be overcome and the operational risk is lowered; and the test method can be finished during pump inspection operation without the need for cooperation of tools such as a packer, a bridge plug, a downhole switch and the like, and the platform occupation time can be shortened, so that the well logging expense is reduced.

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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