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Controlling coal fines in coal bed operations

A technology of pulverized coal and underground formations, applied in the direction of boreholes/well components, production fluids, chemical instruments and methods, etc., which can solve problems such as reduced productivity

Inactive Publication Date: 2012-05-30
BAKER HUGHES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During this methane production, the coal fines will concentrate near the near-wellbore region and will plug the flow passages therein, resulting in a rapid reduction in production rate

Method used

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  • Controlling coal fines in coal bed operations
  • Controlling coal fines in coal bed operations
  • Controlling coal fines in coal bed operations

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0042] Laboratory testing with 20 / 40 mesh (850 / 425 micron) sand packing (simulating proppant packing) showed that without nanoparticle treatment (or coating), 84% of the pulverized coal passed through a 12-inch long ( 30cm) of sand filler. The pulverized coal fluid had a turbidity of 602 FAU (Formazin Attenuation Unit) before passing through the sand packing and was still as high as 505 FAU after the sand packing. However, only 2.5% of the pulverized coal passed the same sand pack treated with 0.1% nanoparticles, where the pulverized coal fluid had a turbidity of 815 FAU before the sand pack and only 21 FAU after passing the nanoparticle treated sand pack . The nanoparticles are MgO crystals with an average particle size of about 30 nm. The proportion of the nanoparticles based on the total amount of fluid was about 8.4 pptg.

[0043] figure 1 is a photograph of tap water flowing through the above sand filler containing no pulverized coal or nanoparticles. figure 2 is a ...

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Abstract

The migration of coal fines within a bed is reduced, inhibited or constrained by contacting the fines with nanoparticles, such as magnesium oxide crystals having an average particle size of about 30 nm. These nanoparticles may coat a proppant during the fracturing of a subterranean formation to produce methane from a coal bed therein. The nanoparticles may also treat a proppant pack in a fractured coal bed. The nanoparticles cause the coal fines to thus bind to or associate with the proppants. Thus, most of the coal fines entering fractures away from the near-wellbore region will be restrained or controlled near their origin or source and the production of methane at a desired level will be maintained much longer than a similar situation than where the nanoparticies are not used.

Description

[0001] Cross References to Related Applications [0002] This application is a continuation-in-part of U.S. Serial No. 11 / 931,501, filed October 31, 2007, and U.S. Serial No. 12 / 277,825, filed November 25, 2008, and U.S. Serial No. 12 / 277,825 is a Continuing Patent Application-in-Part of US Serial No. 11 / 931,706 filed October 31, 2007. technical field [0003] The present invention relates to methods and compositions for immobilizing coal fines from migration, and more particularly in one non-limiting embodiment, to methods and compositions for immobilizing coal in underground formations during methane recovery operations from underground coal seams. Methods and compositions for preventing or inhibiting migration of powders. Background technique [0004] Coal bed methane (CBM) or coal bed methane is a form of natural gas extracted from coal seams. In recent decades, it has become an important energy source. In some fields it is called coal seam gas. This removal of metha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/58C09K8/528E21B43/16
CPCE21B43/006C09K8/5045C09K8/805C09K8/516E21B43/267C09K2208/10C09K8/665
Inventor 黄天平J·B·克鲁斯A·D·加布里施R·M·杰弗瑞
Owner BAKER HUGHES INC