FLUID TO KILL AND CONSERVE WELLS Russian patent published in 2003 - IPC

FIELD: gas and oil production, killing and conservation of wells with abnormally low formation pressure. SUBSTANCE: target of invention lies in preparation of fluid to kill and conserve wells with temperatures to 120 C, with formation pressures below hydrostatic pressure, with low penetrability collectors, with utilization of non-scarce materials making it feasible to maintain collector properties of productive pools and in expansion of assortment of fluids which kill and conserve wells. Fluid to kill and conserve wells contains, per cent by mass: sodium naphthenate 15.0-18.0; compounds of fatty acids of fraction C₁₆ and higher or of their derivatives 2.0-5.0; natural inorganic calcium carbonate with particle diameter from 2 to 50 mcm 2.0-4.0; hydrocarbon base being the balance. In the capacity of gel-forming agent fluid to kill and conserve wells can include: product of treatment of technological acids of wool fat with triethanolamine, synthetic fatty acids of fraction C₁₆ and higher, still bottoms of production of synthetic fatty acids of fraction C₂₀ and higher, fatty acids of tall oil, "oil-chem 3", tarinn. EFFECT: production of efficient fluid to kill and conserve wells. 6 cl, 2 tbl