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Method for preparing surface-modified proppant

A surface modification and surfactant technology, applied in chemical instruments and methods, earthwork drilling, drilling composition, etc., can solve the problems of unstable corrosion resistance of proppant and easy detachment of hydrophobic film on proppant surface. , to achieve the effects of excellent thickening, improved stability, and improved corrosion resistance

Active Publication Date: 2013-08-14
BEIJING RECHSAND SCI & TECH GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the hydrophobic film on the surface of the proppant prepared by the method in the prior art is very easy to fall off, which causes the corrosion resistance of the proppant to be unstable, and to provide a proppant with stable corrosion resistance. Preparation method of proppant

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Heat 10kg quartz sand 20 / 40 mesh to 300°C and put it in a sand mixer to stir and then cool to 200°C. Add 1 kg of phenolic resin to the heated quartz sand and stir to form a mixture, then add 0.01 kg of polyether dimethyl siloxane and 0.2 kg of hexamethylene tetramine and stir evenly. When the phenolic resin-quartz sand mixture starts to agglomerate into agglomerates, add 0.05kg calcium stearate and 0.02kg polydimethylsiloxane and stir evenly. The obtained mixture is cooled, crushed, and sieved to obtain proppant S1.

[0026] In this embodiment, the purpose of heating is to provide a certain reaction temperature in the next step. In actual operation, the substrate can be heated to a higher temperature, such as 150-300℃, and then cooled to 100-240℃. The purpose of this is to remove the volatile impurities on the surface of the substrate material to ensure the subsequent coating. The bonding between the resin material and the base material is closer, and at the same time, t...

Embodiment 2

[0029] Heat 10 kg of 20 / 40 mesh ceramsite sand to 260°C, then put it in a sand mixer and stir and then cool to 100°C. Add 0.2kg of furan resin to the heated ceramsite sand and stir evenly to form a mixture, then add 0.01kg of polyether methylhydrosiloxane, 0.04kg of dibutyl phthalate, and then add 0.02kg of benzenesulfonic acid , Toluenesulfonic acid mixture and stir well. When the furan resin-ceramsite sand mixture starts to agglomerate into agglomerates, add 0.004kg of ethylenebisstearic acid amide and 0.02kg of polymethylhydrogensiloxane and stir evenly. The obtained mixture is cooled, crushed, and sieved to obtain proppant S2.

[0030] The role of dibutyl phthalate as a plasticizer is to improve the performance of the resin film, reduce its brittleness and increase the resistance to crushing.

Embodiment 3

[0032] Heat 10 kg of a mixture of 20 / 40 mesh of quartz sand and 20 / 40 mesh of ceramsite sand to 300°C, then put it in a sand mixer and stir and then cool to 240°C. Add 1.5kg of furan resin to the heated mixture of quartz sand and ceramsite sand and stir it evenly to form a mixture, then add 0.003kg polyhydroxyvinyl methyl hydrogen siloxane and 0.045kg diisooctyl phthalate , Then add 0.045kg xylene sulfonic acid and stir evenly. When the mixture of furan resin-quartz sand and ceramsite sand starts to agglomerate and form agglomerates, add 0.15kg of polyethylene wax and oxidized polyethylene wax mixture, 0.006kg of polymethylhydrogensiloxane and stir evenly. The obtained mixture is cooled, crushed, and sieved to obtain proppant S3.

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PUM

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Abstract

The invention relates to a method for preparing a surface-modified proppant, which comprises the following steps: (a) heating a proppant substrate to 100 to 240 DEG C; (b) adding resin into the heated matrix with stirring to form a mixture to allow the resin to be coated on the surface of the substrate and adding a macromolecular surfactant and a curing agent with stirring to cure the resin coated on the substrate; (c) adding lubricant and hydrophobic macromolecules before the caking of the mixture of the resin and the substrate; and (d) obtaining the proppant by cooling, crushing and screening the mixture obtained by the step c. The proppant prepared by the method has the advantage of stable environment corrosion resistance.

Description

Technical field [0001] The invention belongs to proppants for oil and gas wells in the field of oilfield exploitation, and specifically relates to a preparation method of proppants for oil and gas wells in the field of oilfield exploitation. Background technique [0002] Due to the high viscosity of oil field crude oil, low formation porosity, and poor pore connectivity, it brings great difficulties to oil production. In order to improve the crude oil yield and oil recovery rate, proppants are commonly used to improve rock formation voids and void connectivity. Initially, people directly used quartz sand, ceramsite sand, etc. as proppants, but due to the need to withstand greater impact and closing stress during use, a large number of fragments and fine silt sand will be generated, which will block the cracks and reduce the cracks. Diversion capacity. Therefore, people usually coat one or more layers of resin film on the substrate of proppants such as quartz sand and ceramsite ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/80
CPCC09K8/805
Inventor 秦升益
Owner BEIJING RECHSAND SCI & TECH GRP
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