| abstract |
The invention discloses a wetting and reversing agent, a preparation method and a construction method in a sandstone geothermal reservoir. /mol of copolymer; Monomer A is: Monomer B is: In monomer A, R 1 is CH 3 , C 2 H 5 , C 3 H 7 or R 2 is CH 3 , C 2 H 5 , C 3 H 7 or R 3 is CH 3 , C 2 H 5 , C 3 H 7 or C 4 H 9 , R 4 is CH 3 , C 2 H 5 or C 3 H 7 ; in monomer B, n=1-4; copolymer The molar ratio of the structural unit corresponding to the monomer A and the structural unit corresponding to the monomer B is 1:0.5~2; the copolymer is polymerized by the method of emulsion polymerization, and it can be directly added to the acidizing working fluid when it is used. Reservoir acidizing construction; the wetting reversal agent can effectively change the wettability of solid surface from water wetting to oil wetting, and has good compatibility, does not affect the acidizing working fluid and acid-etchable minerals, The reaction or interaction between acid-soluble substances; the preparation method is simple, controllable, low cost, and the harvesting effect after construction is good. |