In the production of oil proppant time, another serious problem is the reaction of formation fluid is crude oil with an acid to remove residual oil phase can increase the effectiveness of the acid system. Some oils, in particular black heavy oil (<30'APl) and an acid or acid forming slag (precipitated asphalt), either to form a stable emulsion. Moore et al (1965) reported the problem, and give a solution. Sometimes slag breaker agent and does not prevent the formation of a stable emulsion formation. Houchin and Hudmn (1986) discussed similar issues exist organic deposition. Recent resin coated proppant studies have shown, how to prevent the reaction of the acid and the crude acid residue and more stable emulsion. Some "difficult" crude oil between the crude oil and the need to use a hydrocarbon solvent, an acid buffer, crude oil, and the acid can be miscible. Buffers to reduce exposure of crude oil and an acid, and prevent or reduce the acid sludge and emulsion problems. This technique, In Wyoming oilfield construction will increase the success rate from 25% to 75%.
Due to the pressure drop, the asphalt particles will settle. Mutual solvent can be used to partially or completely ceramic proppant disperse them. This action will help to better dissolve the acid-soluble acid solid. To an already oil-based mud competing well well before acidified with an aromatic hydrocarbon solvent pre-soaked conducive flowback. Formulations mutual solvent and surfactant solution can be used as a pre-rinse solution, to restore the formation of water-wet condition.
reported the use co, as a pre-construction solution on acidification has many benefits, helps to reduce the amount of acid to achieve the desired success increase. This type of solution has been demonstrated in the pre-core studies, can improve oil displacement efficiency and improve the flow of the oil.
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