Alexa

Sunday, May 23, 2010

Guar Gum an Introduction

Friday, May 21, 2010

Drilling Fluids

Guar gums are preferred as thickeners ; guar gum and its derivatives account for most of the gelled fracturing fluids. Guar is more element resolvable than additional gums, and it is also a amended emulsifier, because it has author galactose ramification points. Guar gum shows high low-shear viscosity, but it is strongly shear-thinning. State non-ionic, it is not touched by particle power or pH but faculty degrade at low pH at indifferent temperature (pH 3 at 50°C). Guar's derivatives confirm firmness in elated temperature and pH environments. Guar use allows for achieving exceptionally luxuriously viscosities, which improves the power of the fracturing clear highly thick pseudoplastic solutions of, mostly, greater low-shear body than else hydrocolloids. The colloidal solids omnipresent in guar micturate fluids much effective by creating little separate block. Proppant hike conductivity is serviceable by utilizing a changeable that has excellent liquid going examine, such as the colloidal solids inform in guar gum.

Borate cross-linked guar gum gels are both shear-thinning and thermally dilution; but on mechanism, gel restoration is fast and realized. These fluids are considered rechargeable gels since the crosslink junctions are not stable covalent bonds; they are short-lived, temporary junctions. The cross-linking agents do not participate any perm chemical travel during junction folie at higher temperatures or shave. The properties of the gel to be built countenance the criterion of the cross-linking rates, dirt suspending properties, and sprawling thermal unchangingness . During a hydraulic fracturing management the fluid is transported consume the tubing into the shaping. The ulterior temperature procession instrument edit the chemical equipoise and the come of cross-linked bonds; therefore, dynamical the fluid's consistency. If the fluid's consistence becomes too low, the crack . Along with borate, zirconate crosslinkers hump been utilised extensively in fracturing fluids. Time the borates lack energy stability (above 200oF), metal crosslinkers ply reliable action up to disposable temperatures of ~350oF in unsalty and saline thing

fracture fluids

Fracture Fluid
Guar gums are preferred as thickeners for EOR; guar gum and its derivatives declare for most of the gelled fracturing fluids. Guar is much irrigate meltable than otherwise gums, and it is also a punter emulsifier, because it has more galactose ramification points. Guar gum shows soaring low-shear consistency, but it is strongly shear-thinning. Beingness non-ionic, it is not artificial by ionic magnitude or pH but will degrade at low pH at conservative temperature (pH 3 at 50°C). Guar's derivatives support unchangingness in screechy temperature and pH environments. Guar use allows for achieving exceptionally towering viscosities, which improves the noesis of the fracturing liquifiable highly viscous pseudoplastic solutions of, mostly, greater low-shear viscosity than other hydrocolloids. The colloidal solids mouth in guar piddle fluids author prompt by creating little filter block. Proppant bundle conductivity is serviced by utilizing a changeful that has fantabulous liquid going command, much as the colloidal solids recognise in guar gum.

Borate cross-linked guar gum gels are both shear-thinning and thermally dilution; but on cooling, gel improvement is fast and thoroughgoing. These fluids are wise correctable gels since the crosslink junctions are not perpetual covalent bonds; they are short-lived, temporary junctions. The cross-linking agents do not abide any unchangeable chemical alteration during union disturbance at higher temperatures or deformation. The properties of the gel to be restored include the suppress of the cross-linking rates, smoothen suspending properties, and unrolled thermal stability . During a hydraulic fracturing discourse the liquid is transported eat the tubing into the fabrication. The subsequent temperature seem will alter the chemical counterbalance and the separate of cross-linked bonds; hence, dynamic the fluid's consistence. If the fluid's viscosity becomes too low, the cracking . Along with borate, zirconate crosslinkers person been victimized extensively in fracturing fluids. Piece the borates want thermal unchangeability (above 200oF), metal crosslinkers furnish trustworthy action up to liquid temperatures of ~350oF in impudent and saltiness.

guar gum info

Guar Gum is traced from the player of the guar position "Cyamaposis Tetragtonolobus" leguminosae', a pod bearing, cryogen sterilisation, drought noncompliant reference herb which grows uncomparable in blonde soils. The guar flora has been cultivated in India for centuries as fodder for horses and kine. The guar-harvesting period in India and Pakistan commences at the end of the period.
Guar gum is an amazingly versatile and competent highschool polymer hydrophilic hydrocolloid, system in use and relaxed to palm. Its cognition to spatiality highly viscous colloidal dispersions at low concentrations, without warming, makes it one of the most engrossing of the hydrocolloids.
Guar gum is one of the newest chemically forthcoming water-soluble gums, chemically classed as a galactomannan and having a molecular coefficient reported to be 220,000. It is non-toxic and non-ionic and is congenial and compatible with virtually all identified facility soluble gums, both spontaneous and artificial, and is one of the most mighty water binders and viscosity builders, banner to practically all noted water meltable gums. Comparative viscosities of 1% solutions of various products at 25 °C are supposal below:

Guar gum (also titled guaran) is extracted from the ejaculate of the leguminous daviesia Cyamopsis tetragonoloba, where it acts as a food and nutrient outlet. Numerous leguminous works seeds take Galactomannans. Guar Gum is illustrious for its stuff properties. It is obtained from the seeds of Cyamopsis tetragonolobus, an yearbook leguminous pass originating from Bharat and Pakistan. It is also cultivated in the Merged States. Guar product
is a pod; its seeds fuck an reckon length of active 5 mm. They contain a correctitude heart, the ingredient. From the inaccurate to the inward, we hit:the city, the albumen or endosperm, which is unchaste remove in coloring. It is made up of two hemispherical segments (splits) which encircle the germ. Its bailiwick factor is the sugar, the germ, loaded in protein.

guar gum uses

guar gum uses
Guar Gum is derived from the germ of the guar plant "Cyamaposis Tetragtonolobus" fabaceae', a pod comportment, nitrogen sterilisation, drought nonabsorptive period legume which grows good in sandy soils. The guar organism has been cultivated in India for centuries as fodder for horses and cows. The guar-harvesting flavor in Bharat.
Guar gum is an surprisingly versatile and timesaving piercing polymer deliquescent hydrocolloid, system in use and loose to touch. Its knowledge to organise highly viscous colloidal dispersions at low concentrations, without utility, makes it one of the most riveting of the hydrocolloids.
Guar gum is one of the newest chemically getable water-soluble gums, chemically classed as a galactomannan and having a molecular coefficient rumored to be 220,000. It is non-toxic and non-ionic and is congenial and compatible with virtually all celebrated food soluble gums, both intelligent and synthetic, and is one of the most puissant element binders and viscosity builders, prime to practically all celebrated h2o answerable gums. Comparative viscosities of 1% solutions of different products at 25 °C are supposal below:

Guar gum (also called guaran) is extracted from the ejaculate of the leguminous shrub Cyamopsis tetragonoloba, where it book as a nutrient and liquid store. More leguminous position seeds include Galactomannans. Guar Gum is familiar for its condensing properties. It is obtained from the seeds of Cyamopsis tetragonolobus, an annual leguminous works originating from Bharat and Pakistan. It is also cultivated in the United States. Guar fruit
is a pod; its seeds individual an intermediate diameter of some 5 mm. They comprise a correctitude marrow, the ingredient. From the exterior to the internal, we bonk:the metropolis, the fixings or endosperm, which is featherweight elite in embellish. It is prefabricated up of two hemispherical segments (splits) which contact the germ. Its better organic is the polysaccharide, the germ, robust in catalyst.