A kind of xanthan gum composite gel used in underbalanced drilling and its preparation method and application
A technology of composite gel and xanthan gum, which is applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of easy explosion, oxygen enrichment, and the mechanical strength of polymer gel cannot reach field application, etc. Achieve good application prospects and increase the effect of rheological properties
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Embodiment 1
[0046] The preparation of embodiment 1 xanthan gum composite gel
[0047] Weigh a certain quality of deionized water into a beaker with a balance, put a certain quality of xanthan gum into the beaker, stir with a stirrer at a speed of 300r / min for 4h, and let it stand for 24h for use. Then add a certain amount of toughening agent into the beaker containing xanthan gum, and continue to stir. After the dispersion is even, add the crosslinking agent chromium acetate, stir evenly, put it in a constant temperature drying oven at 50°C for 24 hours, observe the gelling situation, and Test its performance. The amount of each substance added during the preparation of the xanthan gum composite gel is shown in Table 1-Table 4.
[0048] Table 1 starch-xanthan gum composite gel formula
[0049]
[0050] Table 2 Silica-xanthan gum composite gel formula
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[0052]
[0053] Table 3 Montmorillonite-xanthan gum composite gel formula
[0054]
[0055] Table 4 lithium-xanth...
Embodiment 2
[0057] The performance of embodiment 2 starch-xanthan gum composite gel
[0058] 1. Rheological properties of starch-xanthan gum composite gel
[0059] Through the rheological performance test, the characteristics of the material can be predicted, mainly testing the elastic modulus (ie storage modulus), viscous modulus (ie loss modulus) and loss factor (ie loss modulus and storage modulus) of the composite gel. volume ratio). In order to clarify the influence of starch content on the viscoelasticity of the gel system, the viscoelasticity and loss factor of gels in different systems were measured with time by a Haake rheometer. The results are as follows figure 1 Shown (preparation and formula of starch-xanthan gum composite gel are shown in embodiment 1 and table 1). The test conditions are: 25°C, stress 10Pa, frequency 1Hz.
[0060] Depend on figure 1 It can be seen from a in the starch that the modulus of elasticity of the starch-xanthan gum composite gel increases after...
Embodiment 3 2
[0074] The performance of embodiment 3 silica-xanthan gum composite gel
[0075] 1. Rheological properties of silica-xanthan gum composite gel
[0076] The rheological properties of the silica-xanthan gum composite gel, that is, the viscoelasticity of the silica-xanthan gum composite gel at room temperature, were characterized by a German Hacker rheometer. Figure 4 It is the viscoelastic curve figure of silica-xanthan gum composite gel (preparation and formula of silica-xanthan gum composite gel see embodiment 1 and table 2), wherein, Figure 4 A in the figure is the elastic modulus figure of silica-xanthan gum composite gel, Figure 4 b in is the viscosity modulus diagram of the silica-xanthan gum composite gel. The test conditions are: 25°C, stress 10Pa, frequency 1Hz.
[0077] From Figure 4In a, it can be seen that with the increase of the amount of silica nanoparticles added, the elastic modulus of the silica-xanthan gum composite gel gradually increases, and when th...
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