| abstract |
The invention discloses a method for selective water plugging of clastic rock oil base. The method adopts a hydrophobic film-coated plugging agent as one of the components of the plugging agent system, and simultaneously adopts a construction process of a non-moving pipe string, which specifically comprises the following steps: Inject the front slug into the formation; inject the weak hydrophobic slug into the formation; inject the medium hydrophobic slug into the formation; inject the strong hydrophobic slug into the formation; inject the displacement slug into the formation. Wherein, the front slug adopts medium oil; the weak hydrophobic slug, medium hydrophobic slug, and strong hydrophobic slug adopt different concentrations of oil-based plugging agent solutions; the displacement slug adopts guar gum solution and formation water. The method greatly reduces the cost of enhanced oil recovery measures, and improves the economic development efficiency of clastic rock water shutoff. |