METHOD FOR REMOVING ASPHALTENORESINPARAFFIN DEPOSITION FROM EQUIPMENT IN WELLS Russian patent published in 1999 - IPC

FIELD: oil production industry. SUBSTANCE: method is realized as follows. Injected into well is proportion of water buffer in amount of not less than 0.5 cu.m. Then injected into annular space of well is solving compound which contains following components: aliphatic and aromatic hydrocarbons, polar non-electrolyte, surface-active substance - demulsifier, and ph regulator. Components are taken in following proportions, vol.%: aliphatic hydrocarbons, 36-78; aromatic hydrocarbons, 20-60; polar non-electrolyte, 0.5-4; surface-active substance - demulsifier, 0.01-1.0; pH regulator, the balance. Compound is injected into well in amount which is equal to cubical volume of pump-compressor pipes in space from well head to pump inlet. Then, this solving compound is pressure-forced by displacing liquid up to well head with immersed pump being running. Application of aforesaid method enhances efficiency in removing asphaltenoresinparaffin depositions from surface of all equipment found in well together with saving solving compound and prolonging operating period of well between cleaning procedures. EFFECT: higher efficiency. 3 cl, 3 tbl