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A sandstone and erosion technology, applied in the field of chemical agents, can solve problems such as strong corrosion, reduced production increase effect, and fast response speed, and achieve low odor, low formation damage, and low corrosive effects
Inactive Publication Date: 2008-04-16
XI'AN PETROLEUM UNIVERSITY
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However, recent studies have shown that to reduce potential fluoride salt precipitation, the ratio should be at least 6:1, preferably 9:1. In ad
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[0054] The acid for etching sandstone of the present invention is prepared by mixing the above-mentioned components.
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Abstract
The invention provides an acid for corroding sandstones. The weight percentage of the compositions of the acid is as follows: 2 to 20 percent of phosphate complexes, 1 to 20 percent of matt salt, 0.01 to 5 percent of acetic acid, 0.01 to 2 percent of citric acid, 0.1 to 3 percent of acidulating inhibiter, 0.1 to 5 percent of mutual solvent, 0.1 to 2 percent of emulsion preventing emulsion splitter, 0.01 to 10 percent of clay stabilizing agent and the allowance is water. The invention has the characteristics that: 1) the effect is remarkable, the stimulation effect is obvious and the period of validity is long; 2) the invention is capable of protecting the reservoir, inhibiting scale, preventing water lock and preventing water sensitivity damage; 3) the acidification rate is low, the reaction is uniform, damage to rock matrixes is low and the intensity is high; 4) the surface tension is low and the oil induction effect is good.
Description
technical field [0001] The invention relates to a chemical agent used in an acidizing process of oil wells, in particular to an acid for corroding sandstone used for removing plugging of oil layers. Background technique [0002] At present, in order to increase the production of oil wells with low permeability, the method of injecting acid into the oil well is generally used to make the acid react with the sandstone in the sandstone reservoir, erode the sandstone, increase the permeability of the oil well, and achieve the purpose of increasing production. The existing acid treatment of sandstone reservoirs usually uses a mixed acid of hydrochloric acid and hydrofluoric acid, i.e. earth acid. The conventional earth acid is prepared according to the ratio of HCl: HF of 4: 1, and ammonium difluoride (NH 4 HF 2 ) was dissolved in HCl to prepare HF to form soil acid plugging solution. However, recent studies have shown that to reduce potential fluoride salt precipitation, the r...
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Application Information
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