Vertical well development method of natural gas hydrate

• Main Authors: LI XIAOLONG, SUN HUANQUAN, WANG HAIBO, CEN XUEQI, HE JIAYUAN, CHAI GUOXING, YANG LIHONG, ZHANG LE
• Format: Patent
• Language: Chinese; English
• Published: 22.02.2022
• Subjects: EARTH DRILLING; EARTH DRILLING, e.g. DEEP DRILLING; FIXED CONSTRUCTIONS; MINING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS

The invention discloses a natural gas hydrate vertical well development method. The method comprises steps that a vertical well is drilled in the upper portion of a natural gas hydrate reservoir, a distance between the well bottom of the vertical well and the reservoir is made to be close to each other, but disturbance of the reservoir is not caused; a window is laterally formed in the bottom of the vertical well, a preset number of lateral radial wells are drilled, concrete is poured into the lateral radial wells, and after the concrete is solidified, an artificial framework borne on a lower interlayer of the reservoir is formed; windowing is conducted on the lower portion of the vertical well, and a vertical radial well is drilled so that the whole reservoir can be drilled through; and after the natural gas hydrate in the mining area is developed, backfilling of the mining area is carried out. The invention provides a systematic technical method integrating reservoir pretreatment, mining and backfilling aft