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DIGITAL LIBRARY: CAMX 2023 | ATLANTA, GA | OCTOBER 30-NOVEMBER 2

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Novel Degradable Polymer Composite Materials to Enable Acid Fracturing at High Temperature High Pressure Conditions

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Title: Novel Degradable Polymer Composite Materials to Enable Acid Fracturing at High Temperature High Pressure Conditions

Authors: Lei Zhao, Jiaxiang Ren, Peng Cheng, Huailiang Liu

DOI: 10.33599/nasampe/c.23.0039

Abstract: Current commercial dissolvable plugs, mainly based on magnesium (Mg) alloys, have been found unsuitable for acid fracturing in oil and gas industry, as those dissolvable Mg alloys react too intensively in acid environment, and nearly all types of commercial protective coatings have been tested ineffective due to inevitable defects/holidays. Thermoplastic Polyglycolic Acid (PGA) may have a significantly low degradation rate in acid, but its temperature rating is too low. To address this issue, we developed a new kind of fiber-enhanced degradable polymer composite material based on thermosets, which offers high strength and temperature rating, as well as low dissolving rate in acid conditions. Degradable thermoset developed in this work offers temperature rating above 150℃, due to its highly cross-linked molecular structure, and exhibits extremely high strength (>120 MPa). Its dissolving rate in acid (15% HCl) is low enough for successful load bearing during 2-6 hrs. of acid hydraulic frac operation and complete dissolve in 2 weeks afterwards in downhole condition. Formulation and molding process have been systematically investigated and optimized to enable large scale manufacturing in high quality at reasonable cost. To the best of our knowledge, it is the first report of degradable thermoset composite material in downhole plug application. This study could not only benefit oil and gas industry to hydraulic frac High Temperature High Pressure (HTHP) reservoir inaccessible before, but also provides a new functional material system that should be potentially used in other industries, such as medical care, marine, environmental protection, etc.

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Conference: CAMX 2023

Publication Date: 2023/10/30

SKU: TP23-0000000039

Pages: 12

Price: $24.00

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