Temporary blocking turnaround fracturing method based on surface modified polyvinyl alcohol fibers
A polyvinyl alcohol fiber, surface modification technology, applied in chemical instruments and methods, earthwork drilling, drilling composition, etc. problem, to achieve the effect of low cost, simple and easy process and good effect
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Embodiment 1
[0030] In order to overcome the low oil and gas production and low recovery rate of the old fractures in the early fracturing, the conventional diversion fracturing technology has problems such as low degree of reservoir stimulation, short effective period of measures, large damage to the reservoir by granular temporary plugging agent, and incomplete degradation, etc. , this embodiment provides a figure 1 and figure 2 The shown temporary plugging diversion fracturing method based on surface-modified polyvinyl alcohol fibers includes the following steps:
[0031] 1) Carry out surface modification to water-soluble polyvinyl alcohol fiber, obtain the modified polyvinyl alcohol fiber;
[0032] 2) Preparation of fracturing working fluid; prepare guar gum cross-linking fluid with a mass fraction of 0.3% as preflush, proppant accounts for 15% to 30% of the volume fraction of guar gum cross-linking fluid, and the modified The mass fraction of polyvinyl alcohol fibers in the proppa...
Embodiment 2
[0043] On the basis of Example 1, the chromic acid solution can be used to modify the surface of the water-soluble polyvinyl alcohol fiber in the step 1), and the formula of the chromic acid solution is K 2 Cr 2 o 7 、H 2 O and concentrated H 2 SO 4 The substance mass ratio is 5:8:100, and the water-soluble polyvinyl alcohol fiber is soaked in the chromic acid solution at room temperature for 2.5 hours.
[0044] KMnO can also be used in the step 1) 4 / Sulfuric acid was used as an initiator to graft acrylic acid modification on water-soluble polyvinyl alcohol fiber, KMnO 4 The concentration is 5×10 -3 mol / L, the concentration of sulfuric acid is 0.2mol / L, the concentration of acrylic acid is 0.8mol / L, and the reaction time is 3.0h.
[0045] In the step 1), the water / ethanol solution of methacryloxypropyltrimethoxysilane can also be used to modify the surface of the water-soluble polyvinyl alcohol fiber, and the concentration is 25×10 -3mol / L of dicumyl peroxide as initia...
Embodiment 3
[0049] On the basis of Example 1 and Example 2, the fiber temporary plugging displacement experiment is designed, and the length of the modified polyvinyl alcohol fiber in the step 2) is preferably 6-8 mm.
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