Pressure reducing and injection increasing agent used for ultralow permeability oil field and preparation method thereof
An injection booster and oilfield technology, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as single chemical system performance, increased oil-water seepage resistance, and unsatisfactory results, so as to increase water injection volume , Reduce the effect of oil-water interface and improve the effect of water injection development
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Embodiment 1
[0025] Example 1: The ability to reduce the oil-water interfacial tension of the pressure-reducing injection agent used in ultra-low permeability oilfields
[0026] Preparation of depressurizing injection agent solution: add 0.32g Gemini surfactant and 0.06g non-ionic surfactant, then add 100g prepared water (see Table 1 for ionic composition) and stir to dissolve completely; Add 16mg of antiscalant to the agent solution, stir to dissolve it; add 4mg of iron ion stabilizer to the mixed solution, and add 899.6g of prepared water, stir and mix evenly, and prepare a total concentration of 400mg / L. agent solution. According to the previous method, increase the amount of gemini surfactant, non-ionic surfactant, scale inhibitor and iron ion stabilizer in the solution to prepare 500mg / L, 600mg / L, 700mg / L, 800mg / L, 900mg / L and 1000mg / L antihypertensive booster solution.
[0027] The TX-500C rotating drop interfacial tensiometer was used to measure the ability of the above-mentioned...
Embodiment 2
[0030] Example 2: The anti-swelling ability of the pressure-reducing injection agent used in ultra-low permeability oilfields
[0031] The measurement method of anti-swelling ability is as follows: Weigh a certain amount of rock core powder (0.5g) and a certain concentration of depressurization injection agent solution (10ml) and place them in a centrifuge tube, stir evenly, let stand for 2 hours, and place in a centrifuge tube. Centrifuge in the machine at room temperature for 15 minutes (speed 1500r / min), take out and read the expansion volume V of the core powder 1 , replace the anti-swelling agent solution with 10ml of water and kerosene and repeat the above steps to measure the expansion volume V of the rock core powder in water and kerosene 2 , V 0 . Measure the anti-swelling rate of the different concentrations of the antihypertensive injection agent solution prepared in Example 1 according to the above-mentioned method, and the anti-swelling rate is calculated as fol...
Embodiment 3
[0038] Embodiment 3: the scale inhibition rate (Ca 2+ )
[0039] According to the method in Example 1, different concentrations of antihypertensive injection agent solutions were prepared. A certain amount of Ca was added to the solution of each concentration 2+ , after the reaction is complete, measure the Ca in the solution 2+ The content of Ca 2+ scale inhibition rate. Experimental results such as image 3 As shown, the antihypertensive booster solution to 9000mg / L Ca 2+ It has good scale inhibition ability, when the concentration is 700mg / L, it is effective for Ca 2+ The scale inhibition rate reaches about 85%.
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