A surface modified proppant
A technology of surface modification and surfactant, which is applied in the fields of mining fluid, wellbore/well components, earthwork drilling and production, etc. It can solve the problems of unstable corrosion resistance of proppant and easy detachment of the hydrophobic layer on the surface of proppant, etc., to achieve The effect of modification is obvious, the effect of environmental corrosion resistance is better, and the effect of enhancing the interaction force
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[0014] There are two methods for preparing the proppant in the present invention, one is the spray-dipping method, and the other is the direct curing method. The two preparation methods are described respectively below.
[0015] Spray immersion method, including the following steps:
[0016] (a) Heat the matrix of the proppant to 100-240°C.
[0017] (b) Add resin to the heated matrix and stir to form a uniformly mixed mixture. The sufficient mixing process makes the resin evenly dispersed around the matrix and forms a film on the surface of the matrix, and then adds a curing agent and fully stirs, so that The resin coated on the surface of the substrate begins to cure. Wherein the weight ratio of resin to matrix is 0.1-15:100, preferably 2-10:100. In this method, before adding the curing agent, a plasticizer can also be added, and the amount of the plasticizer added is 1-30 wt%, preferably 10-20 wt%, of the weight of the resin.
[0018] (c) Before the resin-matrix mixtur...
Embodiment 1
[0030] Heat 10kg of quartz sand with an average particle size of 0.45mm to 300°C, put it into a sand mixer and stir it, then cool it down to 200°C. Add 1 kg of phenolic resin to the heated quartz sand and stir evenly to form a mixture, then add 0.2 kg of hexamethylenetetramine and stir evenly. Before the phenolic resin-quartz sand mixture starts to agglomerate, add 0.05kg calcium stearate and 0.01kg polyether dimethyl siloxane and stir evenly. The obtained mixture is cooled, crushed and sieved to obtain a pre-proppant before the proppant is not coated with the hydrophobic polymer.
[0031] Soak the pre-proppant in a dichloromethane solution with a concentration of 50 wt% polydimethylsiloxane, soak for 2 hours and then dry it at room temperature to obtain a proppant with a polydimethylsiloxane content of 0.02kg S1.
[0032] In this embodiment, the purpose of heating is to provide a certain reaction temperature for the next step. In actual operation, the substrate can be heat...
Embodiment 2
[0035] Heat 10kg of ceramsite sand with an average particle size of about 0.85mm to 260°C, put it into a sand mixer and stir it, and then cool it down to 150°C. Add 0.2kg of furan resin to the heated ceramsite sand and stir evenly to form a mixture, then add 0.04kg of dibutyl phthalate, then add 0.02kg of benzenesulfonic acid and toluenesulfonic acid mixture and stir evenly. Add 0.004kg of ethylene bisstearic acid amide and 0.01kg of polyether methyl hydrogen siloxane before the furan resin-ceramic sand mixture starts to agglomerate and stir evenly. The obtained mixture is cooled, crushed and sieved to obtain a pre-proppant before the proppant is not coated with the hydrophobic polymer.
[0036] Soak the pre-proppant in a dichloromethane solution with a concentration of 150wt% polymethylhydrogensiloxane, soak for 1 hour and then dry at room temperature to obtain a proppant with a polymethylhydrogensiloxane content of 0.02kg S2.
[0037] The role of dibutyl phthalate as a pla...
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