China National Petroleum patented a well cementing method to enhance cementing quality by managing hydration heat release from cement slurry. By controlling the degree and rate of heat release, the method improves binding quality, reducing annular pressure risks in oil and gas wells, especially in short-overlap-section wells. GlobalData’s report on China National Petroleum gives a 360-degree view of the company including its patenting strategy. Buy the report here.
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According to GlobalData’s company profile on China National Petroleum, AI assisted CAD was a key innovation area identified from patents. China National Petroleum's grant share as of February 2024 was 72%. Grant share is based on the ratio of number of grants to total number of patents.
Well cementing method for controlling hydration heat in cement slurry
A recently granted patent (Publication Number: US11926787B2) outlines a novel method for enhancing the quality of well cementing processes. The method involves controlling the hydration heat of cement slurry to regulate the degree and rate of heat release during the cement's formation and curing. By managing the hydration heat, the method aims to improve the binding quality between the cement and interfaces, ultimately enhancing the overall cementing quality at the overlap section of a well. This is particularly beneficial for short-overlap-section wells with a length not exceeding 150 meters, where the method can be applied to both separable setting cement slurry and single setting cement slurry.
Furthermore, the patent details various techniques for adjusting the hydration heat release from the cement slurry, including reducing the addition amount of materials generating high hydration heat, adding retarders, and utilizing specific types of cement components and additives. The method also caters to long-overlap-section wells, where the control of hydration heat can be crucial for ensuring optimal cementing quality. By focusing on high strength and low elastic modulus characteristics of the cement slurry, the method provides additional safety time for thickening, ranging from 30 to 300 minutes, depending on the specific type of slurry being used. Overall, the patent offers a comprehensive approach to improving well cementing quality through precise management of hydration heat release, tailored to different well configurations and cementing scenarios.
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GlobalData’s Patent Analytics tracks patent filings and grants from official offices around the world. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.
