Preparation and Evaluation of Composite Hydrogel for Reducing the Leakage Rate of Lost Circulation

Author:

Jiang Qisheng12,Xu Peng1234,Xu Jie5,Hou Manfu6,Liu Qinglin2,Dai Baimei2

Affiliation:

1. Cooperative Innovation Center of Unconventional Oil and Gas, Yangtze University, Wuhan 430100, China

2. School of Petroleum Engineering, National Engineering Research Center for Oil & Gas Drilling and Completion Technology, Yangtze University, Wuhan 430100, China

3. Hubei Key Laboratory of Oil and Gas Drilling and Production Engineering, Yangtze University, Wuhan 430100, China

4. Jingzhou Jiahua Technology Co., Ltd., Jingzhou 434023, China

5. Haikou Marine Geological Survey Center, China Geological Survey, Haikou 571127, China

6. Bohai Drilling International Engineering Company, Tianjin 300450, China

Abstract

Fractured reservoirs are widely distributed and rich in hydrocarbon resources. When encountering fractured reservoirs during the drilling process, it is often accompanied by formation losses characterized by high leak-off rates, causing severe damage to the reservoir and hindering the detection of oil and gas layers, which is not conducive to the accurate and efficient development of the reservoirs. Conventional plugging materials have poor retention effects in the fractures, resulting in the low stability of the sealing layer. The treatment of malignant lost circulation in fractured formations is an urgent problem to be solved in drilling engineering. This article focuses on improving the success rate of formation plugging through the combined use of multiple plugging materials and develops a composite hydrogel that can effectively reduce leakage rates. This hydrogel is mainly composed of materials such as polyvinyl alcohol, borax, and sodium silicate. It has good temperature resistance, maintains good gel strength at 60 °C, and can maintain long-term performance stability under simulated geological water conditions with salinity of 12,500 mg/L. For immersion corrosion by water or gasoline, the amount of corrosion is small and its fundamental performance remains largely unchanged. Through indoor simulation of a leak formation scenario, the hydrogel demonstrates commendable sealing pressure-bearing capacity. In terms of delaying fluid leakage, mixing the hydrogel with cement slurry at a ratio of 1:1 can delay the leakage rate of the cement slurry by a factor of 5.29.

Funder

Open Fund of Cooperative Innovation Center of Unconventional Oil and Gas, Yangtze University

Hubei Province Science and Technology Plan Project (Key R&D Special Project), China

Key R&D Program Project in Xinjiang, China

Publisher

MDPI AG

Subject

Polymers and Plastics,General Chemistry

Reference25 articles.

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