GEL, LEAKING STOPPAGE METHOD USING THE SAME, AND WELL KILL LEAKING STOPPAGE METHOD USING THE SAME

摘要

The present invention relates to the field of well drilling, and particularly to a gel, a plugging method using the same, and a well killing and plugging method using the same. The gel is a water soluble hydrophobic associated polymer copolymerized by hydrophobic monomer and nonionic monomer, or a water soluble hydrophobic associated polymer copolymerized by hydrophobic monomer, nonionic monomer, and alkene salt monomer. The copolymerization method thereof may be a copolymerization post-hydrolysis method or a copolymerization co-hydrolysis method. The leaking stoppage method using the gel comprises: adding 8-18g of gel to 1kg of water, and feeding the mixture to a leakage layer; and then feeding a spacer fluid. Based on the plugging method using the gel, the well killing and plugging method using the gel further comprises: feeding heavy mud to a well to kill the well cyclically. The present invention provides a gel, which has better pressure resisting performance compared with existing plugging materials, and can be used to solve cave-type vicious well leakage caused by formation fractures, and blowout of a high-pressure gas layer and leakage of a leakage layer that occur in a same well bore.