Particle size, percent drag effeciency and molecular weight control of bulk polymer polymerized polyalpha-olefins using high shear material processors
A material processing, polymer technology, used in mixers, transportation and packaging, fluid mixers, etc.
Inactive Publication Date: 2008-05-21
BAKER HUGHES INC
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Problems solved by technology
If a DRA product contains only 10% polymer, there are significant costs involved in the transportation, storage and delivery of the other 90% of this material which is essentially inert (i.e. does not act as a drag reducer)
Method used
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[0040] Through a combination of reaction temperature, catalyst concentration, cocatalyst concentration, and relative monomer ratios, the molecular weight of drag reducing agent (DRA) polymers can be controlled chemically or mechanistically. The resulting ultrahigh molecular weight polymers cannot be accurately analyzed by traditional solution molecular weight measurement techniques such as gel permeation chromatography or light scattering due to the degradative shear forces involved in these two techniques. One indirect measure of molecular weight is by correlation with percent drag efficiency (ie, a related function of viscosity or molecular size in solution). Therefore, the percent drag efficiency measurement begins by first dissolving the ultra-high molecular weight polymer DRA in a solvent such as hexane. A baseline pressure drop for a solvent in use is obtained by pumping a solvent such as hexane through a pipe of known diameter at a constant flow rate and measuring the p...
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Abstract
High shear materials processing produces polymer drag reducing agent (DRA) slurries without cryogenic temperatures or conventional grinding. The homogenizing or size reduction, as well as controlled molecular weight reduction, of polymer such as poly(alpha-olefins), is achieved by the use of pre-ground polymer and at least one liquid, non-solvent for the polymer DRA in a high shear materials processor such as a homogenizer. In one non- limiting embodiment of the invention, the homogenizing is conducted at ambient temperature. Examples of suitable non-solvents include water and non-aqueous non-solvents including, but not necessarily limited to, alcohols, glycols, glycol ethers, ketones, and esters, having from 2-6 carbon atoms, and combinations thereof. The polymeric DRA may be homogenized to an average particle size of 300 microns or less.
Description
technical field [0001] The present invention relates to the direct preparation of a slurry of finely divided polymeric drag reducer by employing "high shear material processing equipment" by using homogenization techniques. Most particularly, the present invention relates to a process for preparing a slurry of polymeric drag reducer fines that does not require conventional grinding of solid polymeric drag reducers, cryogenics or otherwise, and reduces not only the particle size but also the molecular weight . technical background [0002] The use of polyalphaolefins or copolymers thereof to reduce the resistance of hydrocarbons to flow through conduits and thus the energy requirements of such fluid hydrocarbon transport is well known. These drag reducing agents or DRAs have taken various forms in the past, including slurries or dispersions of ground polymers to form free flowing and pumpable mixtures in liquid media. A problem commonly experienced with simply grinding poly...
Claims
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IPC IPC(8): A61K9/16B01F5/04B05D5/08B29B9/06B29C47/00B60C1/00C08J3/00C08K3/00C08K3/20C08L23/06C08L23/12C08L23/18C09K3/00
CPCC08J3/11C08J2323/08C08F210/16C08F10/02C08F2/02C08F2/005C08F210/08
Inventor T·马休N·S·科马莱迪周陆建J·R·哈利斯董紫菱
Owner BAKER HUGHES INC