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Title: Controllable magneto-rheological fluid-based dampers for drilling

Abstract

A damping apparatus and method for a drillstring comprising a bit comprising providing to the drillstring a damping mechanism comprising magnetorheological fluid and generating an electromagnetic field affecting the magnetorheological fluid in response to changing ambient conditions encountered by the bit.

Inventors:
 [1];  [2]
  1. Edgewood, NM
  2. Youngsville, LA
Publication Date:
Research Org.:
Sandia National Laboratories (SNL-NM), Albuquerque, NM
Sponsoring Org.:
USDOE
OSTI Identifier:
908445
Patent Number(s):
7,036,612
Assignee:
Sandia Corporation (Albuquerque, NM) ALO
DOE Contract Number:
AC04-94AL85000
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING

Citation Formats

Raymond, David W, and Elsayed, Mostafa Ahmed. Controllable magneto-rheological fluid-based dampers for drilling. United States: N. p., 2006. Web.
Raymond, David W, & Elsayed, Mostafa Ahmed. Controllable magneto-rheological fluid-based dampers for drilling. United States.
Raymond, David W, and Elsayed, Mostafa Ahmed. Tue . "Controllable magneto-rheological fluid-based dampers for drilling". United States. doi:. https://www.osti.gov/servlets/purl/908445.
@article{osti_908445,
title = {Controllable magneto-rheological fluid-based dampers for drilling},
author = {Raymond, David W and Elsayed, Mostafa Ahmed},
abstractNote = {A damping apparatus and method for a drillstring comprising a bit comprising providing to the drillstring a damping mechanism comprising magnetorheological fluid and generating an electromagnetic field affecting the magnetorheological fluid in response to changing ambient conditions encountered by the bit.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue May 02 00:00:00 EDT 2006},
month = {Tue May 02 00:00:00 EDT 2006}
}

Patent:

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  • This patent describes a water soluble polymer wherein CH{sub x}, x is 50 mole percent or 66-2/3 mole percent or 75 mole percent and y + z is 50 mole percent, when x is 50 mole percent, C{sub y} {sup {minus}} CH{sub z}, y + 2 is 33-2/3 mole percent, when x is 66-2/3 mole percent, and y + z is 25 mole percent, when x is 75 mole percent, wherein the molar ratio of y to z is about 100:1 to 1:100, and hydrogen or a metal cation selected from the group consisting of lead, aluminum, iron, and Groupsmore » IA, IIA, IB, and IIB of the Periodic Table of Elements and the level of sulfonation based upon the styrene monomer is about 75 to about 100 mole percent, and an alkyl group having about 6 to about 22 carbon atoms.« less
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  • A water base drilling fluid is described comprising a mixture of water and a polymer complex. The polymer complex is the reaction product of a dispersant selected from the group consisting of lignite, sulfonated lignite, lignosulfonate, and sulfoalkylated lignite, and salts thereof, and a water-soluble sulfonated polystyrene having a molecular weight of at least 70,000 and containing 0.7 to 2.0 sulfonic acid groups per styrene unit. The polymer complex has a weight ratio of dispersant to sulfonated polystyrene of from 30:1 to 1:30.
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