Modified reactive resin compositions and use thereof for coating propping agents

a technology of reactive resin and coating, which is applied in the direction of coating, chemistry apparatus and processes, and wellbore/well accessories, etc., can solve the problems of reducing the oil or gas production rate, brittle coating or uncoated proppants currently available, and limited coating effect, for example with organic resins, so as to improve the leveling properties of coating processes and smoother and shinier surfaces. , the effect of reducing the level of reject material resulting from the sticking o

Inactive Publication Date: 2019-08-22
WACKER CHEM GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0128]The reactive resin composition of the invention has improved leveling properties in coating processes. As a result, surfaces are coated more uniformly. It is possible to obtain smoother and shinier surfaces.
[0129]The reactive resin compositions of the invention show advantages in coating of proppants in that the level of reject material resulting from sticking of the proppant is noticeably reduced.
[0130]The reactive resin composition of the invention, as a hardened coating for proppants, has improved fracture resistance, toughness and elasticity and formability, at the same hardness.
[0131]The coating has a reduced tendency to fracture and flake off and protects the proppant more effectively and for a longer period of time against high pressures and impacts. Thus, the stability of the overall proppant is improved.
[0132]Conventional proppants according to prior art are very brittle and have a high tendency to fracture. Fracture of the proppant results in release of fines. Release of fines has an adverse effect on the rate at which the crude oil or natural gas flows through in that the interstices between the proppant grains are blocked and hence the oil or gas source quickly becomes unviable. New wells or refracking become necessary.
[0133]By contrast, the proppants coated in accordance with the invention are more resistant to stresses such as impacts, the formation of pressure and thus have a lower tendency to fracture.

Problems solved by technology

The coated or uncoated proppants currently available are brittle and do not have the necessary compressive strength for production at high depths.
Fracturing of the proppants under the prevailing high pressure releases fine particles that block the cracks and reduce the oil or gas production rate.
However, the effect of the coating, for example with organic resins, is limited by the fact that the available coatings themselves are very brittle and likewise have a tendency to fracture or flake off.
In addition to the use of two additives, it is an additional disadvantage that the toughness improver is a costly block copolymer which is difficult to prepare.
A disadvantage is the complex process.
A disadvantage in both documents is the very complex multistage process which is costly and additionally difficult to control.
Disadvantages here are an additional complex process for chemical modification, and the difficulty of controlling product quality in the case of reaction of two branched polymers.
A disadvantage is the use of silicone resins in very large amounts of at least 10% by weight, which is economically unattractive.

Method used

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  • Modified reactive resin compositions and use thereof for coating propping agents
  • Modified reactive resin compositions and use thereof for coating propping agents
  • Modified reactive resin compositions and use thereof for coating propping agents

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0142]A glass flask was purged with nitrogen, charged with 475 g of novolak “Resin 14772” (Plastics Engineering Company, Sheboygan, USA) and purged with nitrogen once again. The material was melted at 120° C. Then a stirrer was switched on at 420 rpm. 25 g of silicone resin 1 of the composition [PhSiO3 / 2]7.35 [(3-glycidoxypropyl)SiO3 / 2]4.20 [Me2SiO2 / 2]3.45 [MeO1 / 2]6.68 [BuO1 / 2]0.64 (molecular weight according to SEC (THF eluent): Mw=2100 g / mol; Mn=1300 g / mol; viscosity 90-135 cSt; epoxy equivalent weight 660-680 g / mol; epoxy value 1.85 mmol / g) were added and the mixture was stirred at 420 rpm for 10 minutes. The liquid material is poured hot onto a PTFE film and mechanically comminuted, and hence a granular material is produced.

example 2

[0143]By the process of example 1, 25 g of silicone resin 2 of the composition [PhSiO3 / 2]7.30 [(2-amino-ethyl)-3-aminopropyl-SiO3 / 2]2.62 [Me2SiO2 / 2]3.86 [MeO1 / 2]5.88 [BuO1 / 2]0.57 (molecular weight according to SEC (THF / acetic anhydride eluent): Mw=1800 g / mol; Mn=1200 g / mol; viscosity (kinematic, 25° C.) 120 mm2 / s; amine value 2.6-2.9 mmol / g) rather than silicone resin 1 were incorporated and a granular material was produced.

example 3

[0144]By the process of example 1, 25 g of silicone resin 3 of the composition [PhSiO3 / 2]9.44 [MeSiO3 / 2]5.67 [Me2SiO2 / 2]0.63 [MeO1 / 2]6.77 (molecular weight according to SEC (THF eluent): Mw=1800 g / mol; Mn=900 g / mol; viscosity (kinematic, 25° C.) 280 mm2 / s) rather than silicone resin 1 were incorporated and a granular material was produced.

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Abstract

Coated proppants for use in fracking operations for oil and gas production are coated with a reactive resin composition containing 80-99.5 wt. % of a reactive polymer resin, and 0.5 to 8 wt. % of an alkoxy-functional silicone resin. The cured coating exhibits high fracture resistance and yet the proppant particles are free flowing.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application is the U.S. National Phase of PCT Appln. No. PCT / EP2016 / 076383 filed Nov. 2, 2016, the disclosure of which is incorporated in its entirety by reference herein.BACKGROUND OF THE INVENTION1. Field of the Invention[0002]The present invention relates to modified reactive resin compositions and to the use thereof as coating compositions for proppant materials that are used in hydraulic fracturing (“fracking”).2[0003]The fracking method is used in mineral oil and natural gas production and is a method of generating, widening and stabilizing cracks in the rock of a deposit deep underground, with the aim of increasing the permeability of the deposit box. As a result, gases or liquids present therein can flow in an easier and more stable manner to the well and be “produced.”[0004]The cracks generated have to be kept open with proppants. The coated or uncoated proppants currently available are brittle and do not have the necessary ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C09K8/80C09D161/06C09D7/63C08L83/06C08K5/3477
CPCC09K8/805C09D161/06C09D7/63C08L83/06C08K5/3477C08G77/18C08L61/06E21B43/267
Inventor KNOER, SEBASTIANCALIMENTE, DANIELSCHLOSSER, ARNDT
Owner WACKER CHEM GMBH
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