海域天然气水合物泥质粉砂型储层防砂砾石粒径尺寸选择

Size selection of the sand-control gravel particle in the argillaceous siltstone reservoirs of natural gas hydrate in sea areas

余莉 何计彬 叶成明 李小杰 李炳平

YU Li HE Jibin YE Chengming LI Xiaojie LI Bingping

河北大学建筑工程学院 中国地质调查局水文地质环境地质调查中心

College of Architectural Engineering, Hebei University, Baoding 071002, Hebei, China Hydrogeology Environmental Geology Survey Center, China Geological Survey, Baoding 071051, Hebei, China

2017年5月我国海域天然气水合物试采成功，在其防砂关键技术上也取得了突破性成果。针对弱固结、细粒含量较高、防砂难度较大的泥质粉砂型储层，通过分析国内外天然气水合物试采防砂关键技术，结合我国南海海域试采储层的粒径分布范围和充填砾石混合的特点，建立混合粒径组合等效孔隙尺寸模型，计算得出部分工业砾石混合粒径砾石堆积的孔隙分布范围，进而换算成挡砂粒径。在此理论分析的基础上，设计物理模型实验对不同粒径砾石条件下的仿真储层进行阻砂实验，验证了0.23~0.32 mm的砾石可以阻挡0.04 mm以下的泥质粉砂型储层大量出砂，为我国天然气水合物试采防砂砾石尺寸的选择提供了理论依据。

In May 2017, production test of natural gas hydrate in sea areas succeeded in China, and breakthrough achievements were also obtained in the key sand control technologies. The argillaceous siltstone reservoirs with the characteristics of weak consolidation, high fine particle content and high sand control difficulty coefficient were taken as the research object. After domestic and foreign key sand control technologies for the production test of natural gas hydrate were analyzed, combined with the particle size distribution range of the production tested reservoir and the mixing characteristics of packing gravels in the sea area of the South China Sea, the equivalent pore size model of mixed particle size combination was established. The pore distribution range of gravel buildups with mixed particle size of some industrial gravel was calculated and then converted into the sand-retention particle size. Based on the theoretical analysis, the physical model experiment was designed to carry out the sand retention experiments on the simulated reservoir with different gravel particle sizes. It is verified that the gravel of 0.23−0.32 mm can prevent massive sand production of argillaceous siltstone reservoirs below 0.04 mm. The research results provide the theoretical basis for the selection of sand control gravel size in natural gas hydrate production test in China.

10.13639/j.odpt.2019.05.019