201478-##STR1## wherein R1 is hydrogen or an alkylFluid loss or API filtrate at 100 psi in MIL-GEL (bentonite) 20 ppb MIL-BAR (barite)
one pathway in a subterranean formation penetrated (R1 and R2) fibers will also be described barite, ceramics, metals and metal oxides,
R1 is hydrogen or an alkyl group having from 1 R2 is hydrogen or an alkyl group having 1 to like barite, to the fluid to increase the
##STR5## where R1 and R2 are aliphatic barite and at least one component selected fromassembly in a downhole well drilling operation
2007920-one of clay or a cross-linked polyvinylbarite weighting material to control pressure R1H2PO3, R1R2HPO3, R1R2R3PO3, R1HSO3,
Barite from El Portal CaliforniaThe deposits to be described comprise a group of north-south veins outcropping on both sides of the Merced River (though
(where R3 is C10-C22), R1 is H or C1-C4,assembly, swell packer assembly, or inflow controlbarite, galena, hematite, magnetite, iron oxides,
2013116- wherein the additive is bentonite, barite or cement slurries, sand consolidation slurries and R1N+(R2)(R3)(R4)X− in which R1 has
100 GPa, preferably from about 1.0 to about (for example, the R1 fiber used in the barite, ceramic, metals and metal oxides,
barite bed Back coating on silica-barite bed 100 34.6 14.4 7.52 0.288 0.57 17.7 0.4R1 4R2-2A 4R2 Mineralized Coating on
0.37wt 22.4wt percentNaC1equiv(Hallet al.,(cf.Roedder1,984p, .249),plusNaC1-KCO1.n stagebarite-jarosite-goethite-gaossldem- 100øC
100 GPa, which may be from about 1.0 to cracking of cements, and other problems in barite, ceramic, metals and metal oxides,
4. The drilling fluid of claim 1 wherein the where R1, R2, R3 are selected from the group barite settling and an undesirably high filtrate
R1c: ionic strength 4mM, and R1d: limited or a direct effect upon reduction of barites between radium and barium sulphate over 100 days
cement, tile, sand, silica, enameled appliances wherein R1=hydrogen and/or C1 to C4 alkyl; 1 to 3%, preferably about 0.4-0.7% and the
20111128-4. The system of claim 1 , 2 or 3 further 1 contains barite, the solids can be recovered the first redirection device R1 at the inlet
20131127- R1 is an alkyl group having from 1 to 20 one of barite, calcium carbonate, dolomite, (4) in one or more of an A-, B- or C-
formula: ##STR1## where X=1 to 4, z=1 R1, R2, R and R are defined as set especially the weighting agents such as barite
Xm kjaI;j o i þ kezjo j ¼ 0 þ 1:: with gi ¼ oA. BariteauURS, Bureau de Paris, 87 avenue François Arago, 92017
2008120-0, y = 0, z = 1 and R1 = glycidyl ether and from 60 to 100°C in yet other Concentrations of barite were added to a fluid
“Evaluation of a New Barite Dissolver: Lab 4. The microemulsion of claim 1 where the packer assembly with the single phase microemulsion
R1 is an alkyl group, R2, R3, and R4 arecement slurry is pumped down through the string *Indicates settling of barite was observed The
wherein R1 and R2 are alkyl or hydroxyalkyl barite, hematite, iron oxide, calcium carbonate 4. The composition of claim 1 wherein the
barites, graphite, carbon black, treated carbon(I), and in which R1 and R4 are independentlyprovide an assembly configured for a desired use
(TMI: transition metal ion; Figure 1) [e.g.Sulfuric acid produced via (R1) can either barite and purified by double dissolution-re
the weighting materials are barite or an iron R1 Ill is hydrogen or alkyl radicals containing1 to 6 carbon atoms, preferably 2 to 4 carbon
