Method for coating proppants

A proppant and coating technology, applied in chemical instruments and methods, coatings, earthwork drilling, etc., can solve problems such as expensive and difficult to control product quality

Inactive Publication Date: 2019-03-15
WACKER CHEM GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage here is the use of expensive silicone resins and the difficulty in controlling the product quality in the case of the reaction of two branched polymers

Method used

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  • Method for coating proppants
  • Method for coating proppants
  • Method for coating proppants

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0139] The glass flask was purged with nitrogen, charged with 475 g of novolak "Resin 14772" (Plastics Engineering Company, Sheboygan, USA) and purged again with nitrogen. The material was melted at 130°C. The stirrer was then turned on at 420 rpm. Add 25 g of silicone oil 1 (α, ω-functional silicone oil with about 10 to 18 Si—O units and terminal hydroxypropyl groups; dynamic viscosity at 25° C., Brookfield, 10–60 mPa.s) and 5 g of oxalic acid, and then The mixture was first stirred at reflux at 420 rpm for 1 hour at 130°C. The mixture was then heated to 180° C. within 2 hours, and the condensate that occurred was removed. It was then further distilled at 180° C. for 30 minutes. The liquid material is hot poured onto the PTFE membrane. After cooling, the solid material is mechanically crushed to produce granular material.

Embodiment 2

[0141] By the method of Example 1, 25 g of silicone oil 2 (α, ω-functional silicone oil with about 40 to 60 Si—O units and terminal 4-hydroxyl-3-methoxyphenylpropyl groups; at 25 DIN51562 kinematic viscosity at °C: 80 to 130mPa.s) instead of silicone oil 1, and produce granular materials.

Embodiment 3

[0143] By the method of Example 1, incorporate 25g of RE 63F (polydimethylsiloxane with glycidoxypropylmethylsiloxy units and about 100 to 160 Si—O units; dynamic viscosity at 25° C. about 300 mPa.s; from Wacker Chemie AG, Munich) instead of silicone oil 1 and produces granular material.

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Abstract

The invention relates to a method for producing coated proppants which are used in so-called hydraulic fracturing (fracking).

Description

technical field [0001] The present invention relates to a method of producing coated proppants for hydraulic fracturing (= fracking). [0002] The hydraulic fracturing method is used in mineral oil and natural gas production and is a method of creating, widening and stabilizing fractures in the rock of deposits deep underground with the aim of increasing the permeability of the deposit box. Thus, the gas or liquid present therein can flow into the well and be produced in an easier and more stable manner. [0003] The resulting fractures must be held open with proppant. Currently available coated or uncoated proppants are brittle and do not have the required compressive strength for production at high depths. Fracture of proppant under high pressure releases fine particles that block fractures and reduce the rate of oil and gas production. [0004] Coated proppants available according to the prior art have improved stability compared to uncoated proppants. However, the effe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68C09K8/80C09K8/88
CPCC09K8/805C03C11/002C03C12/00C03C17/30C03C17/32C09D161/06C09D183/04C09K8/62
Inventor 塞巴斯蒂安·克内丹尼尔·卡利门特阿恩特·施洛瑟
Owner WACKER CHEM GMBH
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