| Predicate |
Object |
| assignee |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_205ed467ee37eb7413662b5e118197f7 |
| classificationCPCAdditional |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/Y10S507-925
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/Y10S507-921
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C09K2208-30
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/Y10S507-922 |
| classificationCPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C09K8-68
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C09K8-506 |
| classificationIPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C09K8-506
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C09K8-62
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C09K8-68 |
| filingDate |
1997-12-13-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_6a2f7f447abc7a35da27e2957f979833
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_e808b88b61f2217bd4311fe476d21c00
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_fb4d98d55eb3ff7eab3d3d212c0b06e5 |
| publicationDate |
1999-06-16-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber |
GB-2332223-A |
| titleOfInvention |
Viscoelastic surfactant based gelling composition for wellbore service fluids |
| abstract |
A wellbore service fluid comprising a viscoelastic surfactant in combination with means for controlling the concentration of at least partially charged sites within the fluid so as to delay the onset of gelation of said fluid. The means for controlling the concentration of partially charged sites can include an agent capable of releasing counter-ions, an agent capable of removing a hydrogen bond modifier or a method of exchanging ions with the fluid. A class of suitable viscoelastic surfactants are long-chain quaternary ammonium surfactants e.g. cetyltrimethylammonium chloride (CTAB) and N-erucyl-N,N-bis (2-hydroxyethyl)-N- methylammonium chloride. Acid or base hydrolysis of an ester or amide of salicylic acid releases the salicylate anion producing gelation of cetyltrimethyl-ammonium chloride. Hydrogen bond modifiers such as urea, guanidine hydrochloride and urethane can inhibit viscoelasticity in N-erucyl-N,N-bis (2-hydroxyethyl)-N- methylammonium chloride. Urea, guanidine hydrochloride and urethane can be broken down by temperature or either base or acid hydrolysis whereupon the viscoelasticity of the surfactant solution can develop. Solutions of N-erucyl-N,N-bis (2-hydroxyethyl)-N-methylammonium chloride will gel in the presence of certain anions but not in the presence of others. By replacing an anion which inhibits gelation with one that promotes it the surfactant can gelate. |
| isCitedBy |
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-11352548-B2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-6881709-B2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-7084095-B2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-6306800-B1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-7287588-B2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-11319478-B2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-6412561-B1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-10017685-B2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-11713411-B2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-11713413-B2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-7196041-B2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-6435277-B1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-11542815-B2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-7576043-B2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/WO-0177487-A2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-6908888-B2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-11597867-B2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-11390796-B2 |
| priorityDate |
1997-12-13-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type |
http://data.epo.org/linked-data/def/patent/Publication |