Matching medicament and technology for releasing water lock and blockage of reservoir

Abstract

The invention relates to the technical field of petrochemical industry, and concretely relates to a matching medicament and a technology for releasing water lock and blockage of a reservoir. The medicament comprises, by mass, 4-15 parts of a cationic surfactant, 3-6 parts of a zwitterionic surfactant, 10-15 parts of ethylene glycol monobutyl ether, 5-15 parts of hydrochloric acid, 4-10 parts of hydrofluoric acid, 1-3 parts of a corrosion inhibitor, 1-2 parts of an iron ion stabilizer, 2-8 parts of a silicone surfactant, 50-70 parts of an alcohol and 5-20 parts of water. The water lock releasing medicament has the advantages of convenience in preparation, strong surface activity, good high temperature resistance, good high salt tolerance, strong rock adsorption property and low cost, and the lock releasing medicament prepared in the invention has strong diffusion ability after entering the reservoir under the technology, has strong adsorption capacity on the rock surface, can effectively release the water lock and blockage of the gas well reservoir, and can effectively improve the effective permeability of gas and liquid in the gas reservoir for a long term.

Description

technical field [0001] The invention belongs to the technical field of petrochemical industry, and in particular relates to a supporting agent and a process for releasing reservoir water lock and blockage. Background technique [0002] Tahe condensate gas reservoirs are prone to sensitivity, and gas wells are prone to water lock due to wellbore fluid accumulation or invasion of foreign well fluid. Therefore, it is necessary to consider the effect of water locking on the efficiency of gas well productivity. Gas wells have higher start-up pressure after water locking. Only by developing a suitable water locking agent can the efficiency of gas well productivity be effectively improved. [0003] Chinese patent application CN107142098A discloses that the present invention discloses a hydro-blocking agent and a preparation method thereof. The hydro-blocking agent includes at least the following components: the first modified nano-silica obtained by modifying the lipopeptide biosur...

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Problems solved by technology

[0003] Chinese patent application CN107142098A discloses that the present invention discloses a hydro-blocking agent and a preparation method thereof. The hydro-blocking agent includes at least the following components: the first modified nano-silica obtained by modifying the lipopeptide biosurfactant, The second modified nano-silica, ethylene glycol and water obtained by modification with a fluorocarbon surfactant, wherein the weight percentage of the first modified nano-silica is 0.1-0.5%, and the second The weight percentage of the second modified nano-silica is 0.5-1.0%, the weight percentage of the ethylene glycol is 10-30%, and the balance is water, and the first modified nano-silica, the second Two-modified nano-silica, the ethylene glycol and water are injected in proportion through the injection equipment of the water-dissolving and locking agent, and the components are mixed in the injection equipment to form the water-dissolving and locking agent, but it cannot remain effective for a long time Improving Gas-liquid Effective Permeability of Gas Well Reservoir

For oil wells with water-locking damage, according to the leakage of well-washing fluid recorded during the well-washing operation, inject a water-blocking agent of the same volume as the water loss into the formation through the casing annulus, shut down the well for more than 6 hours and then open the well for production. Effectively relieve the water lock damage of low water cut oil wells, but it cannot effectively improve the gas-liquid effective permeability of gas well reservoirs for a long time

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