Oilfield injection-production parameter optimization and adjustment method based on fault stability evaluation

Abstract

The invention discloses an oilfield injection-production parameter optimization and adjustment method based on fault stability evaluation. The method includes the following steps that 1, a fault pressure-bearing limit is predicted; 2, the current balance formation pressure is calculated; 3, the original formation pressure is calculated; 4, the current balance formation pressure is compared with the fault pressure-bearing limit, if the current balance formation pressure is smaller than the fault pressure-bearing limit, a fault is stable, production pressure can be increased properly, and oil well productivity is increased; if the current balance formation pressure is larger than the fault pressure-bearing limit, the fault is in an unstable state, and injection-production parameter adjustment is required to be conducted in fault blocks on the two sides of the fault respectively according to the injection-production parameter optimization and adjustment method in the fault blocks. Based on prediction about the critical pressure required for fault stability maintenance, an oilfield water injection parameter optimization and adjustment method is improved, and the situation that fault activation caused by abnormally high formation pressure gives rise to production safety accidents is avoided.

Description

technical field [0001] The invention relates to the technical field of oilfield water injection development, in particular to a method for optimizing and adjusting oilfield injection and production parameters based on fault stability evaluation. Background technique [0002] Water flooding is the main method of oil production in most oilfields in my country. Water injection wells are used to discharge water into the oil layer to replenish formation energy, increase oil layer pressure, and achieve the effect of stable production of oil fields. However, due to the difference in the physical properties of formation rocks, the water flooding effect of different oil layers is quite different, and the formation pressure is also uneven. Over time, especially in oil fields with a long history of development, with the gradual increase of water injection pressure, the mudstone will become hydrophilic and creep. Casing damage of oil-water wells and unbalanced injection and production h...

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Problems solved by technology

Calculate the equilibrium formation pressure when the liquid injection volume and liquid production volume are balanced, compare this pressure with the normal formation pressure, and make appropriate adjustments to the liquid injection volume and liquid production volume according to the comparison results, with the goal of adjusting the equilibrium formation pressure to be lower than the creep pressure of mudstone, but the existing optimal adjustment method of oilfield injection-production relationship does not consider the critical pressure condition required for underground faults to maintain their stability

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