• 专利标题:   Water blocking agent for use in gas reservoir recovery, comprises sorbitan fatty acid ester and/or imidazoline as W/O emulsifier, wetting reversal agent, synergist, and balance amount of solvent.
  • 专利号:   CN115197682-A
  • 发明人:   YU X, ZHANG C, YANG S, MA Y, KONG C, LI J, TU Z, WEI J, ZHANG X, WANG L, JING H, CHEN L, BAI X, ZHANG B, LIU J, ZENG N, SHEN J, PENG J, HUANG K, YI J
  • 专利权人:   PETROCHINA CO LTD
  • 国际专利分类:   C09K008/502, C09K008/82
  • 专利详细信息:   CN115197682-A 18 Oct 2022 C09K-008/502 202297 Chinese
  • 申请详细信息:   CN115197682-A CN10375827 08 Apr 2021
  • 优先权号:   CN10375827

▎ 摘  要

NOVELTY - Water blocking agent comprises 5.0-6.0 wt.% W/O emulsifier, 0.5-1.0 wt.% wetting reversal agent, 0.5-1.0 wt.% synergist, and balance amount of solvent. USE - Water blocking agent for use in gas reservoir recovery (claimed). ADVANTAGE - The water blocking agent has good shutoff performance, has little influence on the gas phase permeability, can selectively and effectively shut off the water layer, and achieves the effect of water shutoff but not gas shutoff. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: i. A method for preparing water blocking agent, which involves dispersing W/O type emulsifier in a solvent, and adding wetting reversal agent and a synergist to obtain the desired water blocking agent; and ii. a water shutoff method, which involves injecting the water blocking agent into the formation to be water shutoff to recover the gas reservoir.