高压旋喷灌浆法改造近井储层对海洋天然气水合物降压开采潜力影响研究

该文采用高压旋喷灌浆技术对近井储层进行改造,通过在井壁周围形成高渗透泡沫砂浆旋喷桩,结合降压来提升水合物开采效率。以印度K-G盆地NGHP-02-16站位砂质水合物储层为研究对象,构建近井储层改造强化水合物降压开采模型,利用TOUGH+Hydrate对所提方法的增产效果进行数值分析和定量评价。结果表明：近井储层改造能有效提升水合物降压开采效率;水合物开采效率随旋喷桩改造半径和渗透率的增加而增加,但不受旋喷桩孔隙度的影响;降压幅度增大可进一步提升近井储层改造结合降压开采的增产效果。

STUDY OF GAS PRODUCTION FROM MARINE HYDRATE-BEARING SEDIMENTS THROUGH NEAR-WELL RESERVOIR RECONSTRUCTION BY HIGH-PRESSURE JET GROUTING COMBINED WITH DEPRESSURIZATION

This study proposes reconstructing reservoir near the production well by high-pressure jet grouting（HPJG）, which forms a high-permeability foam slurry jet grouting column (JGC） around the wellbore, and combining with depressurization to improve production efficiency. Based on the gas hydrate reservoir at site NGHP-02-16 in the Krishna-Godavari Basin, India, a reservoir reconstruction model for gas production through depressurization is developed to investigate the feasibility of the coupled production method using TOUGH+ Hydrate code. The results show that： Near-well reservoir reconstruction method can effectively improve the hydrate production performance. Hydrate production efficiency increases with the increase of JGC radius and permeability, but not affected by the JGC porosity. Lowering the production pressure can further improve the favorable effect of near-well reservoir reconstruction combined with depressurization method.