3results about How to "Improved water absorption profile" patented technology

The invention belongs to the technical field of oil exploitation, and particularly discloses a water-soluble shunting agent as well as a preparation method and a use method thereof. According to the prepared water-soluble shunting agent, hydrochloric acid and ammonium fluoride are added into water, the shunting agent, the chelating agent, the corrosion inhibitor and the anti-swelling shrinkage agent are added after uniform mixing, online shunting acid is obtained after uniform stirring, the shunting acid is injected into a well, temporary plugging particles are formed by the shunting agent in an acidic environment, the shunting agent can enter a high-permeability layer with small flow resistance more easily, and the water-soluble shunting agent can be used for well drilling. And shielding bridge plugging is formed on a high-permeability channel, so that acid liquor diversion and steering are realized, the acid liquor enters low-permeability, ultra-low-permeability and compact oil reservoir channels, effective plugging removal is performed on the acid liquor, and good diversion and guiding performance is achieved.

The invention discloses a three-dimensional cross-linking channeling sealing technology based on electrostatic force, which comprises a cementitious body for sealing, and a mixing method of the cementitious body comprises the following steps: (1) taking 200g as an example, weighing 198.44 g of water, adding 0.4 g of polymer while stirring, and stirring for 2 hours until the polymer is completely dissolved; (2) adding 1 g of cationic cross-linking agent 1 and 1 g of cationic cross-linking agent 2, and uniformly stirring; (3) adding 0.16 g of an auxiliary agent, and stirring until the auxiliary agent is completely dissolved; and (4) putting the prepared solution in an environment of 45 DEG C, and observing the gel forming condition. A cementitious body formed by the electropositive gel copolymer with a large number of positive charges and the electropositive gel plugging adjusting system is adopted, the cementitious body can be firmly adsorbed on the surface of electronegative rock after being injected underground, residual polymers in an underground flow field can be trapped by surplus positive charges, and the plugging adjusting effect is good. The water-phase permeability of the high-permeability zone is gradually reduced, and finally the effects of plugging the high-permeability layer and improving the water absorption profile are achieved.

The application discloses a tackifier, a preparation method of the tackifier, a composite plug oil displacement agent and an enhanced oil recovery method. The tackifier contains structural unit A, structural unit B, structural unit C and structural unit D, and the mass ratio of the structural unit A, the structural unit B, the structural unit C and the structural unit D is (2000-20000):(2000-40000):(4000-60000):(6000-100000), n is 1-15, m is 1-20, and the viscosity average molecular weight of the tackifier is 45-50 million. The tackifier has the following advantages: under the condition of a temperature of 60-70 DEG C and a salinity of 10000 mg / L, the viscosity of a polymer solution is greater than 100 mPa s; when the concentration of the polymer solution is 1000 mg / L, the surface tension is less than 40 mN / m, the tackifier has the function of emulsifying and dispersing crude oil, and the oil displacement efficiency of a physical model is increased by more than 12%.