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How to avoid inorganic salt precipitation in oilfield production?

wallpapers Industry 2020-12-10

in the process of oilfield productioninorganic salts wax will accumulate on the tubingwellhead equipment pipe wallwhich will reduce the flow cross-section. The activities of oil gas mixture will form additional resistance then the resistance to the bottom of the well will be increasedresulting in the reduction of oil flow from the formation to the well. Thereforeit is very important to study the composition of inorganic salts effectively prevent eliminate the deposition of inorganic salts. So how to avoid inorganic salt precipitation in oilfield production? Let's have a look at it with Xiaobian. In order to eliminate the gypsum deposition of the main component of inorganic saltwe use the following treatment agents: 1. Caustic soda solution; 2. Hydrochloric acid solution with sodium chloride or ammonium chloride; 3. Sodium carbonate solution.

caustic soda aqueous solution: caustic soda aqueous solution reacts with gypsum deposition to form calcium hydroxide sodium sulfate: sodium sulfate can be well dissolved in waterwhile calcium hydroxide is loose easy to change into fine dispersed suspension statewhich can be recovered with liquid flow. The results show that the better concentration of caustic soda solution is 20-25%. When the concentration of caustic soda is lower than 20%the effect is obviously reduced. It is also determined that the reaction rate of inorganic salt will accelerate with the decrease of solution temperature. If necessaryinorganic salts can be eliminated by treating oil wells with hydrochloric acid aqueous solution. The calcium chloride produced by the reaction can be well dissolved in water. Howeverit is sometimes unreasonable to use hydrochloric acid solution to eliminate calcium hydroxidebecause inorganic salts are easy to be destroyed under the action of liquid flow can be carried out during solution circulation. In order to eliminate gypsum depositionhydrochloric acid can be used to treat inorganic salts in oil wells. The results show that the gypsum deposition can be treated with 15% hydrochloric acid with 3-4% ammonium chloride. At the same timethe action condition of this agent is 70-80 ℃. If gypsum is covered with colloidal wax depositionthis is often encountered in practice the effect of hydrochloric acid treatment is not good.

sodium carbonate aqueous solution: the reaction of sodium carbonate aqueous solution to inorganic salts at different temperatures was also carried out in the laboratory. In this casegypsum is converted into calcium carbonatewhich must be eliminated with 10-15% hydrochloric acid solution. The above three kinds of

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