Experiment method for researching influence on CO2 flooding by highly-mineralized formation water
A technology with high salinity and experimental method, applied in the field of core flooding, can solve the problems of lack of corrosion resistance and oleophobicity, difficult to achieve quantitative data acquisition, etc., to avoid corrosion, prevent corrosion, and achieve the effect of accurate data
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Embodiment 1
[0033] Such as Figure 1~9 As shown, a study on the effect of high-salinity formation water on CO 2 The experimental method of flooding effect, the steps are as follows:
[0034] 1) Take the core, cut the core slices A and B at the core injection end and the exit end respectively, wash the core, dry and weigh it, measure the pore volume of the core, gas permeability, deionized water saturation core, and NMR measurement. Put it into the core holder for displacement, and get the core water permeability;
[0035] 2) Use crude oil to replace deionized water saturated crude oil, keep the temperature and pressure, and carry out CO 2 Water gas injection, core washing, drying, measuring mass, pore volume, gas permeability, vacuuming, deionized water saturated core, deionized water displacement, measuring core water permeability, measuring nuclear magnetic resonance;
[0036] 3) Cut the core slices C and D at the core injection end and the exit end respectively, clean and dry them, ...
Embodiment 2
[0045] Such as Figure 1~9 As shown, a study on the effect of high-salinity formation water on CO 2 The experimental method of flooding effect, the steps are as follows:
[0046] 1) Take the core, cut the core slices A and B respectively at the core injection end and the exit end, the thickness is preferably 2 mm, wash the core, dry and weigh, measure the pore volume of the core, gas permeability, deionized water saturation core, measure Nuclear magnetic resonance, put the core into the core holder for displacement, and get the water permeability of the core;
[0047] 2) Use de-asphaltened crude oil to displace deionized water-saturated crude oil, keep the temperature and optimal pressure for 24 hours, and carry out CO 2 Water gas injection, first inject 5PV of CO 2 Then inject 5PV deionized water for a total of 3 cycles of injection, washing the core, drying, measuring mass, pore volume, gas permeability, vacuuming, deionized water saturation core, deionized water displace...
Embodiment 3
[0055] Such as Figure 1~9 As shown, a study on the effect of high-salinity formation water on CO 2 Experimental method of flooding effect:
[0056] Core processing: for observation of CO 2 The change of rock surface morphology and rock minerals before and after displacement, under the current technical conditions, special treatment has been carried out. Before the reaction, core slices with a thickness of preferably 2mm are cut at the injection end of the core and the outlet end of the core respectively. A and B, as analytical samples. CO 2 After the flooding, core slices C and D with a thickness of preferably 2mm are cut at the injection end of the core and the outlet end of the core respectively, so as to avoid the inhomogeneity of the core as much as possible.
[0057] In order to separately study the CO 2 -water-rock interaction, CO 2 - Influence of formation water precipitation on reservoir physical properties and development parameters, as shown in Table 1, by des...
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