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Method for preparing surface-modified proppant

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

Active Publication Date: 2010-03-10
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 of quartz sand 20 / 40 mesh to 300°C, put it into a sand mixer, stir and then cool down to 200°C. Add 1 kg of phenolic resin to the heated quartz sand and stir evenly to form a mixture, then add 0.01 kg of polyether dimethyl siloxane and 0.2 kg of hexamethylenetetramine and stir evenly. When the phenolic resin-quartz sand mixture starts to agglomerate, 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 for the next step. In actual operation, the substrate can be heated to a higher temperature, such as 150-300°C, and then cooled to 100-240°C. The purpose of this is to remove the volatile impurities on the surface of the substrate raw material to ensure the subsequent coating. The bond between the resin material and the matrix material is tighter, and at the same time,...

Embodiment 2

[0029]Heat 10kg of ceramsite sand 20 / 40 mesh to 260°C, put it into a sand mixer and stir it, then cool it down 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 methyl hydrogen siloxane, 0.04kg of dibutyl phthalate, and then add 0.02kg of benzenesulfonic acid , toluenesulfonic acid mixture and stir well. Add 0.004kg of ethylene bisstearic acid amide and 0.02kg of polymethylhydrogensiloxane before the furan resin-ceramic sand mixture starts to agglomerate 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 its resistance to crushing.

Embodiment 3

[0032] Heat 10kg of quartz sand 20 / 40 mesh and ceramsite sand 20 / 40 mesh mixture to 300°C, put it into a sand mixer and stir it, then cool it down to 240°C. Add 1.5kg furan resin to the heated mixture of quartz sand and ceramsite sand and stir evenly to form a mixture, then add 0.003kg polyhydroxyvinyl methyl hydrogen siloxane, 0.045kg diisooctyl phthalate , then add 0.045kg xylenesulfonic acid and stir evenly. Add the mixture of 0.15kg polyethylene wax and oxidized polyethylene wax, 0.006kg polymethylhydrogensiloxane and stir evenly before the mixture of furan resin-quartz sand and ceramsite sand starts to agglomerate. 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 the oil and gas well proppant in the field of oilfield exploitation, and in particular relates to a preparation method of the oil and gas well proppant in the field of oilfield exploitation. Background technique [0002] Due to the high viscosity of crude oil in the oilfield, the low porosity of rock formations and the poor connectivity of voids, it brings great difficulties to oil recovery. In order to increase crude oil yield and oil recovery rate, proppant is generally 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 bear large impact force and closure stress during use, a large number of fragments and fine silt will be produced, which will block the fracture and reduce the crack's proppant. diversion capacity. Therefore, at present, people usually coat one or more layers of resin film on the matrix of proppant...

Claims

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Application Information

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