non-radioactive chemical substances, used as markers, to be added to gravel pack material for sand control operations for determining the location of the gravel pack material; non-radioactive chemical substances, used as markers, to be added to cement used in oil and gas wells for determining the location of the cement

'ad':11,39 'cement':41,54 'chemic':4,32 'control':18 'determin':21,49 'gas':46 'gravel':13,26 'locat':23,51 'marker':8,36 'materi':15,28 'non':2,30 'non-radioact':1,29 'oil':44 'oper':19 'pack':14,27 'radioact':3,31 'sand':17 'substanc':5,33 'use':6,34,42 'well':47

NRT

Owners

Goods & Services