Fracturing fluid flowback performance evaluation method based on formation wettability
An evaluation method and fracturing fluid technology, which is applied in the preparation of test samples, material weighing, sampling, etc., can solve the problems that the flowback of fracturing fluid cannot be truly simulated, and achieve the effect of low evaluation cost
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Embodiment 1
[0060] (1) Preparation of core
[0061] 1) Rock blocks are washed with oil, washed with salt and dried: sandstone blocks are taken, and the main component of the core is silicon dioxide. Use acetone as a solvent to wash the oil and salt of the rock block using the Soxhlet extraction method, and dry it to constant weight at 60°C;
[0062] 2) Preparation of rock powder: take the rock blocks that have been washed with oil, washed with salt, and dried, crushed and put into a pulverizer, and crushed to 100-1000 mesh to obtain rock powder;
[0063] 3) Preparation of cementing aids
[0064] Weigh octamethylcyclotetrasiloxane, chloroform, N-methylpyrrolidone, and dimethyl carbonate according to a mass ratio of 3:1:2:2, and mix them uniformly to prepare a cementation aid;
[0065] 4) Mixture preparation
[0066] Weigh the prepared rock powder and cementation aid according to the mass ratio of 5:2, and mix them evenly to prepare the mixture;
[0067] 5) Molding
[0068] Pour the mixt...
Embodiment 2
[0095] Formula 1: specific embodiment 1 fracturing fluid formula
[0096] Formula 2: 0.3% hydroxypropyl guar gum + 0.1% glutaraldehyde + 2% potassium chloride + 0.012% dodecyl hydroxypropyl dimethyl ammonium chloride + 0.08% sodium carbonate + 0.03% borax + 0.06% Ammonium persulfate
[0097] Formula 3: 0.3% Hydroxypropyl Guar Gum + 0.1% Glutaraldehyde + 2% Potassium Chloride + 0.01% Lauryl Polyoxyethylene Ether + 0.08% Sodium Carbonate + 0.03% Borax + 0.06% Ammonium Persulfate
specific Embodiment 1
[0101] The cores used are sandstone cores.
[0102] The test results are shown in Table 1.
[0103] Table 1 Fracturing fluid flowback rate
[0104]
[0105]
[0106] It can be seen from Table 1 that for the same type of fracturing fluid (both guar gum fracturing fluid), only the type and dosage of drainage aids are different, and the surface / interfacial tension is basically the same (surface tension is 25.2-25.6mN / m, interface tension is 25.2-25.6mN / m, Tension 0.6-0.8mN / m), the flowback rate is 53.25-81.13%, and the flowback rate varies greatly. Therefore, compared with the commonly used method of evaluating the drainage performance of fracturing fluids by surface / interfacial tension, this method can The influence of the type and dosage of the drainage agent on the drainage performance is determined, so as to better evaluate the drainage performance of the fracturing fluid.
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